/* =========================================================
   فيزياء+ — منصة العلوم الفيزيائية للتعليم المتوسط
   Feuille de style principale
   ========================================================= */

/* ---------- 1. Tokens ---------- */
:root{
  --navy-950:#051626;
  --navy-900:#071c2f;
  --navy-800:#0a2742;
  --navy-700:#0e3557;
  --navy-600:#13466e;
  --teal-600:#0b7d7b;
  --teal-500:#12a8a4;
  --teal-400:#2dd4bf;
  --teal-100:#d9f7f3;
  --teal-50:#effcfb;
  --gold-500:#e9b24a;
  --gold-400:#f4c76b;
  --gold-100:#fdf3dd;
  --ink:#0c2237;
  --ink-2:#29465e;
  --muted:#587085;
  --muted-2:#61788b;
  --bg:#f3f7fa;
  --surface:#ffffff;
  --surface-2:#f8fbfd;
  --line:#e1eaf1;
  --line-2:#cfdde8;
  --danger:#c0392b;
  --danger-soft:#fdecea;
  --success:#0e7353;
  --success-soft:#e7f8f1;
  --warning:#a86b0b;
  --warning-soft:#fdf5e3;
  --radius-xs:10px;
  --radius-sm:14px;
  --radius:20px;
  --radius-lg:28px;
  --shadow-xs:0 1px 2px rgba(7,28,47,.05);
  --shadow-sm:0 6px 18px -8px rgba(7,28,47,.14);
  --shadow:0 18px 40px -24px rgba(7,28,47,.28);
  --shadow-lg:0 36px 70px -36px rgba(7,28,47,.38);
  --font-body:"Cairo","Segoe UI",Tahoma,Arial,sans-serif;
  --font-display:"Tajawal","Cairo","Segoe UI",Tahoma,Arial,sans-serif;
  --font-math:"Cambria Math","Times New Roman",serif;
  --container:1200px;
  --header-h:76px;
  --ease:cubic-bezier(.22,.75,.28,1);
  --level:#0d8f8d;
  --level-soft:#e4f8f6;
}

/* ---------- 2. Reset & base ---------- */
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none !important}
html{scroll-behavior:smooth; -webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.8;
  color:var(--ink);
  background:var(--bg);
  direction:rtl;
  text-align:right;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(620px 420px at 100% -10%, rgba(18,168,164,.08), transparent 70%),
    radial-gradient(520px 380px at -10% 30%, rgba(233,178,74,.06), transparent 70%);
}
img,svg{max-width:100%}
img{height:auto;display:block}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer;background:none;border:0;padding:0}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,h5,p{margin:0}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.3;letter-spacing:-.015em}
p{color:var(--ink-2)}
::selection{background:var(--teal-100);color:var(--navy-900)}
:focus-visible{outline:3px solid rgba(45,212,191,.55);outline-offset:3px;border-radius:6px}
::placeholder{color:var(--muted-2);opacity:1}
html.js .reveal{opacity:0;transform:translateY(22px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
html.js .reveal.is-visible{opacity:1;transform:none}

/* ---------- 3. Utilities ---------- */
.container{width:min(var(--container),calc(100% - 40px));margin-inline:auto}
.container-narrow{width:min(880px,calc(100% - 40px));margin-inline:auto}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip-link{position:absolute;top:-60px;right:16px;z-index:999;background:var(--gold-500);color:var(--navy-900);padding:10px 18px;border-radius:0 0 12px 12px;font-weight:700;transition:top .2s}
.skip-link:focus{top:0}
.text-muted{color:var(--muted)}
.text-teal{color:var(--teal-600)}
.text-danger{color:var(--danger)}
.text-success{color:var(--success)}
.text-center{text-align:center}
.mt-0{margin-top:0}
.mt-1{margin-top:8px}
.mt-2{margin-top:16px}
.mt-3{margin-top:24px}
.mt-4{margin-top:32px}
.mb-0{margin-bottom:0}
.mb-2{margin-bottom:16px}
.mb-3{margin-bottom:24px}
.d-flex{display:flex}
.align-center{align-items:center}
.justify-between{justify-content:space-between}
.gap-1{gap:8px}
.gap-2{gap:16px}
.gap-3{gap:24px}
.wrap{flex-wrap:wrap}
.hide{display:none !important}
.icon{width:22px;height:22px;flex:0 0 auto;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.icon-sm{width:17px;height:17px}
.icon-lg{width:28px;height:28px}
.icon-tile{display:inline-flex;align-items:center;justify-content:center;width:50px;height:50px;border-radius:15px;background:var(--teal-50);color:var(--teal-600);border:1px solid rgba(13,143,141,.14)}
.divider{height:1px;background:var(--line);border:0;margin-block:28px}

/* ---------- 4. Buttons ---------- */
.btn{
  --btn-bg:var(--teal-600);
  --btn-fg:#fff;
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:48px;padding:11px 22px;border-radius:13px;
  font-family:var(--font-body);font-weight:700;font-size:.95rem;line-height:1.2;
  color:var(--btn-fg);background:var(--btn-bg);
  border:1px solid transparent;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),background .2s,color .2s,border-color .2s;
  white-space:nowrap;
}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn .icon{width:19px;height:19px}
.btn-primary{
  background:linear-gradient(135deg,var(--teal-500),#0e7490);
  box-shadow:0 12px 24px -12px rgba(13,143,141,.65);
}
.btn-primary:hover{box-shadow:0 16px 30px -12px rgba(13,143,141,.7)}
.btn-gold{background:linear-gradient(135deg,var(--gold-400),var(--gold-500));color:var(--navy-900);box-shadow:0 12px 26px -14px rgba(233,178,74,.8)}
.btn-dark{background:var(--navy-800);color:#fff}
.btn-dark:hover{background:var(--navy-700)}
.btn-outline{background:transparent;color:var(--navy-800);border-color:var(--line-2)}
.btn-outline:hover{border-color:var(--teal-500);color:var(--teal-600);background:var(--teal-50)}
.btn-soft{background:var(--teal-50);color:var(--teal-600);border-color:rgba(13,143,141,.18)}
.btn-soft:hover{background:var(--teal-100)}
.btn-ghost{background:transparent;color:var(--ink-2)}
.btn-ghost:hover{background:rgba(12,34,55,.05)}
.btn-white{background:#fff;color:var(--navy-900);box-shadow:var(--shadow-sm)}
.btn-white:hover{background:var(--teal-50)}
.btn-danger{background:var(--danger-soft);color:var(--danger);border-color:rgba(192,57,43,.16)}
.btn-lg{min-height:56px;padding:14px 30px;font-size:1.02rem;border-radius:15px}
.btn-sm{min-height:38px;padding:7px 14px;font-size:.84rem;border-radius:10px}
.btn-block{width:100%}
.btn-icon{width:42px;height:42px;min-height:0;padding:0;border-radius:11px}
.btn[disabled]{opacity:.55;cursor:not-allowed;transform:none !important;box-shadow:none}
.btn-group{display:flex;flex-wrap:wrap;gap:10px}

/* ---------- 5. Badges / chips / tags ---------- */
.badge{display:inline-flex;align-items:center;gap:7px;padding:5px 11px;border-radius:999px;font-size:.75rem;font-weight:700;line-height:1.4;background:var(--teal-50);color:var(--teal-600);border:1px solid rgba(13,143,141,.14)}
.badge-gold{background:var(--gold-100);color:#8a5a08;border-color:rgba(233,178,74,.25)}
.badge-dark{background:rgba(255,255,255,.1);color:#dff7f4;border-color:rgba(255,255,255,.14)}
.badge-neutral{background:#eef3f7;color:var(--ink-2);border-color:var(--line)}
.badge-danger{background:var(--danger-soft);color:var(--danger);border-color:rgba(192,57,43,.14)}
.badge-success{background:var(--success-soft);color:var(--success);border-color:rgba(18,128,92,.14)}
.tag{display:inline-flex;align-items:center;gap:6px;font-size:.77rem;font-weight:700;color:var(--muted);background:var(--surface-2);border:1px solid var(--line);padding:4px 10px;border-radius:8px}
.dot{width:7px;height:7px;border-radius:50%;background:var(--teal-500);display:inline-block;flex:0 0 auto}
.chip{display:inline-flex;align-items:center;gap:7px;padding:8px 14px;border-radius:999px;border:1px solid var(--line);background:#fff;font-size:.84rem;font-weight:700;color:var(--ink-2);transition:.2s;cursor:pointer}
.chip:hover{border-color:var(--teal-400);color:var(--teal-600)}
.chip.is-active{background:var(--navy-800);border-color:var(--navy-800);color:#fff}
.chip .count{font-size:.68rem;font-weight:700;color:var(--muted)}
.chip.is-active .count{color:rgba(255,255,255,.85)}

/* ---------- 6. Header ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(7,28,47,.92);
  border-bottom:1px solid rgba(255,255,255,.08);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  color:#fff;
}
.site-header .container{display:flex;align-items:center;gap:26px;min-height:var(--header-h)}
.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto}
.brand-mark{width:42px;height:42px;filter:drop-shadow(0 6px 12px rgba(45,212,191,.25))}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-family:var(--font-display);font-size:1.32rem;font-weight:800;color:#fff;letter-spacing:-.01em}
.brand-name span{color:var(--teal-400)}
.brand-sub{font-size:.6rem;letter-spacing:.18em;color:#8fb3c9;font-weight:600;text-transform:uppercase}
.main-nav{display:flex;align-items:center;gap:4px;margin-inline-start:10px}
.main-nav a{position:relative;padding:9px 13px;border-radius:9px;font-size:.9rem;font-weight:600;color:#c4d7e5;transition:.2s}
.main-nav a:hover{color:#fff;background:rgba(255,255,255,.07)}
.main-nav a.is-active{color:#fff}
.main-nav a.is-active::after{content:"";position:absolute;bottom:2px;right:13px;left:13px;height:2px;border-radius:2px;background:var(--teal-400)}
.header-actions{display:flex;align-items:center;gap:10px;margin-inline-start:auto}
.header-actions .btn{min-height:42px;padding:8px 17px;font-size:.86rem}
.user-chip{display:flex;align-items:center;gap:10px;padding:5px 6px 5px 12px;border-radius:999px;border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.06);transition:.2s;cursor:pointer}
.user-chip:hover{background:rgba(255,255,255,.11)}
.avatar{width:34px;height:34px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;background:linear-gradient(145deg,var(--teal-400),#0e7490);color:var(--navy-950);font-weight:800;font-size:.8rem;flex:0 0 auto}
.user-meta{display:flex;flex-direction:column;line-height:1.2;text-align:right}
.user-meta strong{font-size:.78rem;color:#fff;font-weight:700;max-width:130px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.user-meta small{font-size:.62rem;color:#92b4c9}
.header-user{display:flex;align-items:center;gap:8px}
.nav-toggle{display:none;width:42px;height:42px;border:1px solid rgba(255,255,255,.18);border-radius:11px;color:#fff;align-items:center;justify-content:center}
.mobile-nav{display:none}
.user-menu{position:relative}
.user-menu-panel{position:absolute;top:calc(100% + 10px);left:0;width:230px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:8px;color:var(--ink);z-index:90}
.user-menu-panel a,.user-menu-panel button{display:flex;align-items:center;gap:10px;width:100%;padding:10px 12px;border-radius:9px;font-size:.85rem;font-weight:600;color:var(--ink-2);text-align:right}
.user-menu-panel a:hover,.user-menu-panel button:hover{background:var(--surface-2);color:var(--teal-600)}
.user-menu-panel .sep{height:1px;background:var(--line);margin:6px 4px}

/* ---------- 7. Footer ---------- */
.site-footer{background:var(--navy-950);color:#b9cfdd;padding:64px 0 0;margin-top:80px;position:relative;overflow:hidden}
.site-footer::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 300px at 85% 0%,rgba(45,212,191,.09),transparent 70%);pointer-events:none}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:40px;position:relative}
.footer-brand .brand-name{font-size:1.5rem}
.footer-brand p{color:#8ba7ba;font-size:.88rem;max-width:300px;margin-top:14px;line-height:1.9}
.footer-title{color:#fff;font-family:var(--font-display);font-size:.98rem;font-weight:700;margin-bottom:16px}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a,.footer-links span{color:#93aec0;font-size:.85rem;transition:.2s;display:inline-flex;align-items:center;gap:7px}
.footer-links a:hover{color:var(--teal-400);transform:translateX(-3px)}
.footer-contact{display:flex;align-items:flex-start;gap:9px;color:#93aec0;font-size:.84rem;margin-bottom:12px;line-height:1.7}
.footer-contact .icon{color:var(--teal-400);margin-top:4px}
.footer-bottom{margin-top:48px;padding:22px 0;border-top:1px solid rgba(255,255,255,.08);display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:.76rem;color:#7d99ac}
.footer-bottom .made{display:inline-flex;align-items:center;gap:7px}
.footer-bottom .made .dot{background:var(--gold-500)}

/* ---------- 8. Sections ---------- */
.section{padding:84px 0}
.section-tight{padding:56px 0}
.section-alt{background:#fff;border-block:1px solid var(--line)}
.section-dark{background:var(--navy-900);color:#fff}
.section-head{max-width:720px;margin-bottom:44px}
.section-head.center{margin-inline:auto;text-align:center}
.eyebrow{display:inline-flex;align-items:center;gap:9px;font-size:.75rem;font-weight:800;letter-spacing:.08em;color:var(--teal-600);text-transform:uppercase;margin-bottom:14px}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--teal-500);border-radius:2px}
.section-head.center .eyebrow::before{display:none}
.section-dark .eyebrow{color:var(--teal-400)}
.section h2{font-size:clamp(1.8rem,3vw,2.55rem);color:var(--navy-900);margin-bottom:14px}
.section-dark h2{color:#fff}
.section-head p{font-size:1.02rem;color:var(--muted);max-width:640px;line-height:1.9}
.section-head.center p{margin-inline:auto}
.section-foot{margin-top:34px;display:flex;justify-content:center}

/* ---------- 9. Cards / panels ---------- */
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-xs)}
.card-pad{padding:26px}
.card-hover{transition:transform .25s var(--ease),box-shadow .25s var(--ease),border-color .25s}
.card-hover:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:var(--line-2)}
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow-xs)}
.panel-head{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:18px}
.panel-head h3{font-size:1.05rem;color:var(--navy-900)}
.panel-head .link-more{font-size:.78rem;font-weight:700;color:var(--teal-600);display:inline-flex;align-items:center;gap:4px}
.panel-head .link-more:hover{text-decoration:underline}
.empty{padding:38px 20px;text-align:center;color:var(--muted);border:1px dashed var(--line-2);border-radius:14px;background:var(--surface-2)}
.empty .icon{width:40px;height:40px;color:var(--muted-2);margin-bottom:8px}
.empty strong{display:block;color:var(--ink-2);font-size:.95rem;margin-bottom:4px}
.empty p{font-size:.82rem;color:var(--muted)}

/* ---------- 10. Forms ---------- */
.field{margin-bottom:18px}
.field label{display:block;font-size:.85rem;font-weight:700;color:var(--ink-2);margin-bottom:7px}
.input,.select,.textarea{
  width:100%;min-height:50px;padding:11px 15px;border:1.5px solid var(--line-2);border-radius:12px;
  background:#fff;font-size:.95rem;color:var(--ink);transition:border-color .2s,box-shadow .2s;
}
.input:focus,.select:focus,.textarea:focus{outline:none;border-color:var(--teal-500);box-shadow:0 0 0 4px rgba(18,168,164,.12)}
.textarea{min-height:110px;resize:vertical}
.select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='none' stroke='%23617991' stroke-width='2'%3E%3Cpath d='m3 6 5 5 5-5'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:left 14px center;padding-left:38px}
.input-icon{position:relative}
.input-icon .icon{position:absolute;top:50%;transform:translateY(-50%);right:15px;width:19px;height:19px;color:var(--muted-2);pointer-events:none}
.input-icon .input{padding-right:44px}
.form-help{font-size:.75rem;color:var(--muted);margin-top:6px;line-height:1.6}
.form-error{display:none;align-items:center;gap:8px;margin-top:12px;padding:10px 13px;border-radius:10px;background:var(--danger-soft);color:var(--danger);font-size:.82rem;font-weight:600;border:1px solid rgba(192,57,43,.14)}
.form-error.is-visible{display:flex}
.check{display:flex;align-items:flex-start;gap:9px;font-size:.82rem;color:var(--muted);cursor:pointer;line-height:1.6}
.check input{width:17px;height:17px;margin-top:3px;accent-color:var(--teal-600);flex:0 0 auto}

/* ---------- 11. Progress / rings ---------- */
.progress{height:8px;border-radius:99px;background:#eaf1f6;overflow:hidden}
.progress > span{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--teal-500),var(--teal-400));transition:width .7s var(--ease)}
.progress-gold > span{background:linear-gradient(90deg,var(--gold-500),var(--gold-400))}
.ring{
  --value:0;--size:116px;--thickness:9px;
  width:var(--size);height:var(--size);border-radius:50%;flex:0 0 auto;position:relative;
  background:conic-gradient(var(--teal-400) calc(var(--value)*1%),rgba(255,255,255,.14) 0);
  display:grid;place-items:center;
}
.ring::before{content:"";position:absolute;inset:var(--thickness);border-radius:50%;background:inherit;background:var(--ring-inner,#0d3352)}
.ring > div{position:relative;text-align:center;line-height:1.25}
.ring strong{display:block;font-family:var(--font-display);font-size:1.55rem;color:#fff;font-weight:800}
.ring small{display:block;font-size:.62rem;color:#9fc1d5;font-weight:600}
.ring-light{background:conic-gradient(var(--teal-500) calc(var(--value)*1%),#e8eff5 0)}
.ring-light::before{background:#fff}
.ring-light strong{color:var(--navy-900)}
.ring-light small{color:var(--muted)}

/* ---------- 12. Header nav responsive ---------- */
@media (max-width: 980px){
  .main-nav{display:none}
  .nav-toggle{display:inline-flex}
  .header-actions .btn-label{display:none}
  .mobile-nav{display:none;position:absolute;top:var(--header-h);right:0;left:0;background:var(--navy-900);border-bottom:1px solid rgba(255,255,255,.1);padding:14px 20px 20px;box-shadow:0 24px 40px -20px rgba(0,0,0,.5)}
  .mobile-nav.is-open{display:block;animation:fadeDown .25s var(--ease)}
  .mobile-nav a{display:flex;align-items:center;gap:10px;padding:12px 12px;border-radius:10px;color:#c4d7e5;font-weight:600;font-size:.92rem}
  .mobile-nav a:hover,.mobile-nav a.is-active{background:rgba(255,255,255,.07);color:#fff}
  .mobile-nav .btn{margin-top:10px;width:100%}
  @keyframes fadeDown{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}
}

/* ---------- 13. Home : hero ---------- */
.hero{position:relative;background:var(--navy-950);color:#fff;overflow:hidden;padding:80px 0 96px}
.hero::before{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(900px 560px at 12% -10%,rgba(18,168,164,.22),transparent 65%),
    radial-gradient(700px 520px at 92% 8%,rgba(19,70,110,.65),transparent 70%),
    linear-gradient(160deg,rgba(5,22,38,.2),rgba(5,22,38,.9));
}
.hero-grid-bg{
  position:absolute;inset:0;opacity:.35;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.055) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.055) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse at 50% 20%,#000 25%,transparent 72%);
  -webkit-mask-image:radial-gradient(ellipse at 50% 20%,#000 25%,transparent 72%);
}
.hero .container{position:relative;z-index:2}
.hero-grid{display:grid;grid-template-columns:1.06fr .94fr;gap:48px;align-items:center}
.hero-copy{max-width:620px}
.hero-eyebrow{display:inline-flex;align-items:center;gap:9px;padding:7px 14px;border-radius:999px;border:1px solid rgba(45,212,191,.28);background:rgba(45,212,191,.08);color:#9ff3e9;font-size:.75rem;font-weight:700;margin-bottom:24px}
.hero-eyebrow .dot{background:var(--gold-400);box-shadow:0 0 0 4px rgba(244,199,107,.15)}
.hero h1{font-size:clamp(2.2rem,4.6vw,3.75rem);line-height:1.22;letter-spacing:-.02em;color:#fff;margin-bottom:22px}
.hero h1 .accent{color:var(--teal-400);position:relative;white-space:nowrap}
.hero h1 .accent::after{content:"";position:absolute;right:0;left:0;bottom:2px;height:9px;background:rgba(45,212,191,.16);border-radius:4px;z-index:-1}
.hero-lead{font-size:1.06rem;line-height:1.95;color:#b8d0df;max-width:560px;margin-bottom:30px}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:30px}
.hero-trust{display:flex;flex-wrap:wrap;gap:22px;padding-top:24px;border-top:1px solid rgba(255,255,255,.1)}
.hero-trust span{display:inline-flex;align-items:center;gap:8px;font-size:.8rem;color:#9db9ca;font-weight:600}
.hero-trust .icon{width:17px;height:17px;color:var(--teal-400)}
.hero-visual{position:relative;display:flex;align-items:center;justify-content:center;min-height:430px}
.atom-wrap{position:relative;width:min(420px,100%);aspect-ratio:1;display:grid;place-items:center}
.atom-wrap::before{content:"";position:absolute;inset:12%;border-radius:50%;background:radial-gradient(circle,rgba(45,212,191,.16),transparent 68%);filter:blur(8px)}
.atom-svg{width:100%;height:100%;position:relative;z-index:2;overflow:visible}
.atom-svg .orbit{fill:none;stroke:rgba(45,212,191,.32);stroke-width:1.2}
.atom-svg .orbit-2{stroke:rgba(244,199,107,.35)}
.atom-svg .orbit-3{stroke:rgba(110,198,255,.24)}
.atom-svg .electron{fill:var(--teal-400);filter:drop-shadow(0 0 6px rgba(45,212,191,.8))}
.atom-svg .electron-gold{fill:var(--gold-400);filter:drop-shadow(0 0 6px rgba(244,199,107,.7))}
.atom-svg .nucleus{fill:url(#nucleusGrad)}
.atom-svg .spin-slow{transform-origin:210px 210px;animation:spin 34s linear infinite}
.atom-svg .spin-rev{transform-origin:210px 210px;animation:spin 46s linear infinite reverse}
@keyframes spin{to{transform:rotate(360deg)}}
.float-chip{position:absolute;z-index:3;display:flex;align-items:center;gap:10px;padding:10px 14px;border-radius:13px;background:rgba(9,37,59,.82);border:1px solid rgba(255,255,255,.14);backdrop-filter:blur(12px);box-shadow:0 20px 40px -22px rgba(0,0,0,.7);font-size:.73rem;color:#d7e9f2;font-weight:600;animation:float 6s ease-in-out infinite}
.float-chip strong{display:block;color:#fff;font-size:.8rem}
.float-chip .icon{color:var(--teal-400);width:20px;height:20px}
.float-chip small{display:block;font-size:.6rem;color:#8fb3c9;font-weight:500;line-height:1.4}
.float-chip.a{top:9%;right:-2%;animation-delay:-1s}
.float-chip.b{bottom:12%;left:-4%;animation-delay:-3s}
.float-chip.c{top:49%;left:-7%;animation-delay:-4.5s}
.float-chip.d{bottom:2%;right:8%;animation-delay:-2s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}
.hero-orb{position:absolute;border-radius:50%;filter:blur(50px);opacity:.5;pointer-events:none}
.hero-orb.a{width:180px;height:180px;background:rgba(18,168,164,.3);top:12%;left:12%}
.hero-orb.b{width:140px;height:140px;background:rgba(233,178,74,.14);bottom:8%;right:18%}

/* stats strip */
.stats-strip{position:relative;z-index:3;margin-top:-38px}
.stats-strip .inner{display:grid;grid-template-columns:repeat(4,1fr);background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);overflow:hidden}
.stat-item{padding:24px 22px;display:flex;align-items:center;gap:14px;border-inline-start:1px solid var(--line)}
.stat-item:first-child{border-inline-start:0}
.stat-item .icon-tile{width:46px;height:46px;border-radius:13px}
.stat-item strong{display:block;font-family:var(--font-display);font-size:1.55rem;color:var(--navy-900);line-height:1.1;font-weight:800}
.stat-item span{display:block;font-size:.76rem;color:var(--muted);font-weight:600;margin-top:3px}

/* ---------- 14. Features ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feature-card{padding:26px;border-radius:var(--radius);background:#fff;border:1px solid var(--line);transition:.25s var(--ease);position:relative;overflow:hidden}
.feature-card::after{content:"";position:absolute;inset-inline-end:-30px;top:-30px;width:90px;height:90px;border-radius:50%;background:var(--teal-50);opacity:0;transition:.3s}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:rgba(13,143,141,.25)}
.feature-card:hover::after{opacity:.7}
.feature-card .icon-tile{margin-bottom:16px;position:relative;z-index:1;background:var(--level-soft,var(--teal-50));color:var(--level,var(--teal-600));border-color:transparent}
.feature-card h3{font-size:1.02rem;margin-bottom:7px;color:var(--navy-900)}
.feature-card p{font-size:.85rem;color:var(--muted);line-height:1.85;margin:0}

/* ---------- 15. Level cards ---------- */
.level-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.level-card{position:relative;display:flex;flex-direction:column;padding:24px;border-radius:var(--radius);background:#fff;border:1px solid var(--line);overflow:hidden;transition:.28s var(--ease)}
.level-card::before{content:"";position:absolute;top:0;right:0;left:0;height:4px;background:linear-gradient(90deg,var(--level),transparent 85%)}
.level-card::after{content:"";position:absolute;width:130px;height:130px;border-radius:50%;background:var(--level-soft);top:-45px;left:-45px;opacity:.7;transition:.3s}
.level-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:var(--line-2)}
.level-card:hover::after{transform:scale(1.15)}
.level-top{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;position:relative;z-index:1;margin-bottom:22px}
.level-badge{display:inline-flex;align-items:center;justify-content:center;width:52px;height:52px;border-radius:15px;background:var(--level);color:#fff;font-family:var(--font-display);font-weight:800;font-size:1.02rem;letter-spacing:-.02em;box-shadow:0 12px 22px -12px var(--level)}
.level-num{font-family:var(--font-display);font-size:2.2rem;font-weight:800;color:var(--level-soft);line-height:1;letter-spacing:-.04em}
.level-card h3{position:relative;z-index:1;font-size:1.1rem;color:var(--navy-900);margin-bottom:5px}
.level-card .level-sub{position:relative;z-index:1;font-size:.72rem;font-weight:700;color:var(--level);letter-spacing:.03em;margin-bottom:10px}
.level-card p{position:relative;z-index:1;font-size:.83rem;color:var(--muted);line-height:1.8;margin-bottom:18px;flex:1}
.level-foot{position:relative;z-index:1;display:flex;align-items:center;justify-content:space-between;padding-top:14px;border-top:1px solid var(--line)}
.level-foot span{font-size:.74rem;font-weight:700;color:var(--muted)}
.level-foot .go{width:34px;height:34px;border-radius:50%;background:var(--level-soft);color:var(--level);display:grid;place-items:center;transition:.25s}
.level-card:hover .go{background:var(--level);color:#fff;transform:translateX(-3px)}

/* ---------- 16. Steps ---------- */
.steps{position:relative;display:grid;grid-template-columns:repeat(4,1fr);gap:26px;counter-reset:step}
.steps::before{content:"";position:absolute;top:26px;right:8%;left:8%;height:1.5px;background:repeating-linear-gradient(90deg,var(--line-2) 0 6px,transparent 6px 12px);z-index:0}
.step{position:relative;z-index:1;text-align:center;padding:0 6px}
.step-num{width:54px;height:54px;border-radius:50%;margin:0 auto 16px;background:#fff;border:1.5px solid var(--line-2);display:grid;place-items:center;font-family:var(--font-display);font-size:1.05rem;font-weight:800;color:var(--teal-600);box-shadow:var(--shadow-xs);position:relative}
.step-num::after{content:"";position:absolute;inset:-7px;border-radius:50%;border:1px dashed rgba(13,143,141,.2)}
.step h3{font-size:.95rem;color:var(--navy-900);margin-bottom:6px}
.step p{font-size:.8rem;color:var(--muted);line-height:1.8;margin:0;max-width:210px;margin-inline:auto}

/* ---------- 17. Showcase ---------- */
.showcase{display:grid;grid-template-columns:.9fr 1.1fr;gap:48px;align-items:center}
.showcase-copy h2{font-size:clamp(1.7rem,3vw,2.4rem);margin-bottom:16px;color:var(--navy-900)}
.showcase-copy p{color:var(--muted);font-size:.98rem;line-height:1.95;margin-bottom:26px}
.showcase-list{display:grid;gap:12px}
.showcase-item{display:flex;align-items:flex-start;gap:13px;padding:13px 15px;border:1px solid var(--line);border-radius:13px;background:#fff;cursor:pointer;transition:.2s;text-align:right;width:100%}
.showcase-item:hover{border-color:rgba(13,143,141,.3);background:var(--teal-50)}
.showcase-item.is-active{border-color:var(--teal-500);background:var(--teal-50);box-shadow:0 10px 24px -20px var(--teal-600)}
.showcase-item .icon{color:var(--teal-600);margin-top:4px}
.showcase-item strong{display:block;font-size:.9rem;color:var(--navy-900)}
.showcase-item small{display:block;font-size:.76rem;color:var(--muted);line-height:1.6;margin-top:1px}
.preview-shell{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow-lg);overflow:hidden;position:relative}
.preview-bar{display:flex;align-items:center;gap:7px;padding:11px 16px;background:var(--surface-2);border-bottom:1px solid var(--line)}
.preview-bar .pdot{width:9px;height:9px;border-radius:50%;background:#e2e9ef}
.preview-bar .pdot:nth-child(2){background:#f4c76b}
.preview-bar .pdot:nth-child(3){background:#67d6c8}
.preview-url{margin-inline-start:12px;font-size:.65rem;color:var(--muted-2);direction:ltr;background:#fff;border:1px solid var(--line);border-radius:6px;padding:3px 10px;flex:1;text-align:left}
.preview-body{padding:24px;min-height:390px;background:linear-gradient(180deg,#fff, #fbfdfe)}
.preview-pane{display:none;animation:fadeIn .3s ease}
.preview-pane.is-active{display:block}
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.mini-kicker{font-size:.62rem;font-weight:800;letter-spacing:.1em;color:var(--teal-600);text-transform:uppercase;margin-bottom:8px}
.mini-title{font-size:1.3rem;color:var(--navy-900);margin-bottom:9px;line-height:1.4}
.mini-text{font-size:.8rem;color:var(--muted);line-height:1.85;margin-bottom:16px}
.mini-lesson-tags{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:18px}
.mini-box{border:1px solid var(--line);border-radius:12px;padding:14px;background:#fff;margin-bottom:10px}
.mini-box h4{font-size:.8rem;color:var(--navy-900);margin-bottom:5px}
.mini-box p{font-size:.72rem;color:var(--muted);line-height:1.7;margin:0}
.mini-file{display:flex;align-items:center;gap:11px;border:1px solid var(--line);border-radius:11px;padding:11px 13px;margin-bottom:8px;background:#fff}
.mini-file .ficon{width:36px;height:36px;border-radius:9px;display:grid;place-items:center;font-size:.6rem;font-weight:800;color:#fff;flex:0 0 auto}
.mini-file .ficon.pdf{background:#c0392b}
.mini-file .ficon.doc{background:#2b6cb0}
.mini-file strong{display:block;font-size:.76rem;color:var(--navy-900)}
.mini-file small{display:block;font-size:.63rem;color:var(--muted)}
.mini-video{position:relative;border-radius:13px;overflow:hidden;aspect-ratio:16/9;background:linear-gradient(135deg,#0b2742,#13466e);display:grid;place-items:center}
.mini-video::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 30% 30%,rgba(45,212,191,.22),transparent 60%)}
.mini-play{width:52px;height:52px;border-radius:50%;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.3);display:grid;place-items:center;color:#fff;position:relative;z-index:1;backdrop-filter:blur(6px)}
.mini-video span{position:absolute;bottom:12px;right:14px;font-size:.67rem;color:#d7e9f2;z-index:1;background:rgba(5,22,38,.55);padding:3px 9px;border-radius:6px}
.mini-q{border:1px solid var(--line);border-radius:11px;padding:13px;margin-bottom:9px;background:#fff}
.mini-q strong{font-size:.78rem;color:var(--navy-900);display:block;margin-bottom:8px}
.mini-opt{display:flex;align-items:center;gap:8px;padding:7px 10px;border:1px solid var(--line);border-radius:7px;font-size:.69rem;color:var(--ink-2);margin-bottom:5px}
.mini-opt:last-child{margin:0}
.mini-opt .bullet{width:16px;height:16px;border-radius:50%;border:1.5px solid var(--line-2);display:grid;place-items:center;font-size:.52rem;color:var(--muted);flex:0 0 auto}
.mini-opt.ok{border-color:rgba(18,128,92,.3);background:var(--success-soft);color:var(--success)}
.mini-opt.ok .bullet{background:var(--success);border-color:var(--success);color:#fff}
.preview-badge{position:absolute;bottom:-14px;left:24px;background:var(--gold-500);color:var(--navy-900);font-size:.68rem;font-weight:800;padding:7px 13px;border-radius:8px;box-shadow:0 10px 20px -12px rgba(233,178,74,.8);z-index:2}

/* ---------- 18. CTA band ---------- */
.cta-band{position:relative;background:linear-gradient(135deg,var(--navy-900),#0d3c58 60%,#0f4f5c);border-radius:var(--radius-lg);padding:52px;color:#fff;overflow:hidden;display:flex;align-items:center;justify-content:space-between;gap:30px}
.cta-band::before{content:"";position:absolute;width:360px;height:360px;border-radius:50%;background:rgba(45,212,191,.14);filter:blur(20px);top:-160px;left:-60px}
.cta-band::after{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.11) 1px,transparent 1px);background-size:22px 22px;opacity:.35;mask-image:linear-gradient(90deg,#000,transparent 65%);-webkit-mask-image:linear-gradient(90deg,#000,transparent 65%)}
.cta-band > *{position:relative;z-index:1}
.cta-band h2{font-size:clamp(1.6rem,2.6vw,2.2rem);color:#fff;margin-bottom:10px}
.cta-band p{color:#bdd7e3;font-size:.95rem;max-width:560px;margin:0}
.cta-band .btn{flex:0 0 auto}

/* ---------- 19. Auth / login ---------- */
.auth-page{background:var(--navy-950);min-height:100vh;display:flex;flex-direction:column}
.auth-page .site-header{position:relative}
.auth-main{flex:1;display:grid;grid-template-columns:1.02fr .98fr;min-height:calc(100vh - var(--header-h));position:relative;overflow:hidden}
.auth-brand{position:relative;padding:64px 60px;color:#fff;display:flex;flex-direction:column;justify-content:center;overflow:hidden;background:radial-gradient(700px 500px at 20% 10%,rgba(18,168,164,.18),transparent 65%)}
.auth-brand::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:56px 56px;mask-image:radial-gradient(circle at 30% 40%,#000,transparent 70%);-webkit-mask-image:radial-gradient(circle at 30% 40%,#000,transparent 70%)}
.auth-brand > *{position:relative;z-index:1}
.auth-brand h1{font-size:clamp(1.9rem,3.2vw,2.9rem);line-height:1.3;color:#fff;margin-bottom:16px;max-width:520px}
.auth-brand h1 span{color:var(--teal-400)}
.auth-brand p{color:#a9c5d5;max-width:470px;line-height:1.95;font-size:.96rem;margin-bottom:28px}
.auth-points{display:grid;gap:12px;max-width:440px}
.auth-point{display:flex;align-items:flex-start;gap:11px;font-size:.85rem;color:#c7dbe7;line-height:1.7}
.auth-point .icon{color:var(--teal-400);margin-top:4px}
.auth-visual{position:absolute;bottom:-30px;left:-20px;width:300px;opacity:.6;pointer-events:none}
.auth-quote{margin-top:34px;padding:16px 18px;border:1px solid rgba(255,255,255,.12);border-radius:13px;background:rgba(255,255,255,.04);max-width:440px}
.auth-quote p{font-size:.8rem;color:#a9c5d5;margin:0;line-height:1.8}
.auth-quote strong{display:block;color:#fff;font-size:.76rem;margin-top:6px;font-weight:700}
.auth-panel{padding:56px 40px;display:flex;align-items:center;justify-content:center;background:var(--bg);position:relative}
.auth-card{width:min(440px,100%);background:#fff;border:1px solid var(--line);border-radius:22px;padding:38px;box-shadow:var(--shadow-lg);position:relative}
.auth-card::before{content:"";position:absolute;top:0;right:36px;left:36px;height:3px;border-radius:0 0 4px 4px;background:linear-gradient(90deg,var(--teal-500),var(--gold-500))}
.auth-head{text-align:center;margin-bottom:28px}
.auth-head .icon-tile{margin-bottom:14px;width:56px;height:56px;border-radius:17px}
.auth-head h2{font-size:1.5rem;color:var(--navy-900);margin-bottom:6px}
.auth-head p{font-size:.85rem;color:var(--muted);line-height:1.7}
.code-input{letter-spacing:.08em;font-weight:700;text-align:center;font-size:1.05rem;direction:ltr;text-transform:uppercase;font-family:"Consolas",monospace}
.auth-sep{display:flex;align-items:center;gap:12px;margin:22px 0;color:var(--muted-2);font-size:.7rem}
.auth-sep::before,.auth-sep::after{content:"";flex:1;height:1px;background:var(--line)}
.teacher-link{display:flex;align-items:center;justify-content:center;gap:7px;font-size:.78rem;font-weight:700;color:var(--muted);transition:.2s}
.teacher-link:hover{color:var(--teal-600)}
.demo-box{margin-top:18px;border:1px dashed var(--line-2);border-radius:11px;padding:11px 14px;background:var(--surface-2)}
.demo-box summary{cursor:pointer;font-size:.75rem;font-weight:700;color:var(--muted);list-style:none;display:flex;align-items:center;gap:6px}
.demo-box summary::-webkit-details-marker{display:none}
.demo-box summary .icon{width:14px;height:14px;transition:.2s}
.demo-box[open] summary .icon{transform:rotate(180deg)}
.demo-codes{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-top:9px}
.demo-code{display:flex;align-items:center;justify-content:space-between;gap:4px;padding:5px 7px;border:1px solid var(--line);border-radius:6px;background:#fff;font-size:.62rem;color:var(--muted);cursor:pointer;transition:.15s}
.demo-code:hover{border-color:var(--teal-400);color:var(--teal-600)}
.demo-code b{direction:ltr;font-family:Consolas,monospace;color:var(--ink-2);font-size:.64rem}
.auth-foot{text-align:center;margin-top:24px;font-size:.7rem;color:var(--muted-2);line-height:1.7}

/* ---------- 20. Page shell / dashboard ---------- */
.page-wrap{padding:34px 0 70px;min-height:60vh}
.page-top{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:28px;flex-wrap:wrap}
.page-title h1{font-size:clamp(1.55rem,2.6vw,2.05rem);color:var(--navy-900);margin-bottom:4px}
.page-title p{font-size:.88rem;color:var(--muted);margin:0}
.breadcrumb{display:flex;align-items:center;gap:7px;flex-wrap:wrap;font-size:.75rem;color:var(--muted);margin-bottom:18px}
.breadcrumb a:hover{color:var(--teal-600)}
.breadcrumb .icon{width:12px;height:12px;color:var(--muted-2)}
.breadcrumb span{color:var(--ink-2);font-weight:600}
.dash-hero{position:relative;background:linear-gradient(120deg,var(--navy-900),#0c3a52 70%,#0c4a55);border-radius:var(--radius-lg);padding:34px 38px;color:#fff;overflow:hidden;display:grid;grid-template-columns:1.35fr .65fr;gap:26px;align-items:center;margin-bottom:24px}
.dash-hero::before{content:"";position:absolute;inset:0;background:radial-gradient(500px 300px at 88% 15%,rgba(45,212,191,.22),transparent 70%);pointer-events:none}
.dash-hero::after{content:"U = R × I";position:absolute;left:28px;bottom:20px;font-family:var(--font-math);font-size:1rem;color:rgba(255,255,255,.14);direction:ltr}
.dash-hero > *{position:relative;z-index:1}
.dash-hero .badge{margin-bottom:12px}
.dash-hero h1{font-size:clamp(1.5rem,2.6vw,2.1rem);color:#fff;margin-bottom:7px}
.dash-hero h1 span{color:var(--teal-400)}
.dash-hero p{color:#a9c8d8;font-size:.87rem;margin:0 0 17px;max-width:520px}
.dash-hero .btn{min-height:43px;padding:9px 18px;font-size:.84rem}
.dash-side{display:flex;align-items:center;justify-content:center}
.dash-side .ring{--size:132px;--thickness:10px}
.dash-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:26px}
.dash-stat{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px 19px;display:flex;align-items:center;gap:13px;box-shadow:var(--shadow-xs);transition:.2s}
.dash-stat:hover{transform:translateY(-3px);box-shadow:var(--shadow-sm)}
.dash-stat .icon-tile{width:44px;height:44px;border-radius:12px;flex:0 0 auto}
.dash-stat strong{display:block;font-family:var(--font-display);font-size:1.4rem;font-weight:800;color:var(--navy-900);line-height:1.2}
.dash-stat span{display:block;font-size:.7rem;color:var(--muted);font-weight:600;margin-top:2px}
.dash-layout{display:grid;grid-template-columns:1fr 330px;gap:24px;align-items:start}
.dash-main{min-width:0}
.dash-aside{display:grid;gap:18px;position:sticky;top:calc(var(--header-h) + 20px)}
.lesson-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.lesson-card{position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;transition:.22s var(--ease);display:flex;flex-direction:column;min-height:210px}
.lesson-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--line-2)}
.lesson-card.is-done{border-color:rgba(18,128,92,.2);background:linear-gradient(180deg,#fff,#f8fdfb)}
.lesson-card-top{display:flex;align-items:flex-start;justify-content:space-between;gap:10px;margin-bottom:12px}
.lesson-idx{width:36px;height:36px;border-radius:10px;background:var(--level-soft);color:var(--level);display:grid;place-items:center;font-family:var(--font-display);font-weight:800;font-size:.82rem;flex:0 0 auto}
.lesson-card .badge{font-size:.66rem;padding:4px 9px}
.lesson-card h3{font-size:.98rem;color:var(--navy-900);line-height:1.45;margin-bottom:6px}
.lesson-card p{font-size:.78rem;color:var(--muted);line-height:1.75;margin-bottom:14px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.lesson-card-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:10px;padding-top:12px;border-top:1px solid var(--line);font-size:.7rem;color:var(--muted)}
.lesson-card-foot .go{width:30px;height:30px;border-radius:50%;background:var(--surface-2);color:var(--muted);display:grid;place-items:center;transition:.2s}
.lesson-card:hover .go{background:var(--level);color:#fff}
.lesson-card.is-done .lesson-card-foot .go{background:var(--success-soft);color:var(--success)}
.continue-card{display:flex;align-items:center;gap:16px;padding:18px 20px;border-radius:16px;background:linear-gradient(120deg,var(--teal-50),#fff);border:1px solid rgba(13,143,141,.18);margin-bottom:18px}
.continue-card .icon-tile{background:var(--teal-600);color:#fff;border:0;flex:0 0 auto}
.continue-card div{flex:1;min-width:0}
.continue-card small{font-size:.66rem;font-weight:800;color:var(--teal-600);letter-spacing:.06em}
.continue-card strong{display:block;font-size:.92rem;color:var(--navy-900);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.continue-card .btn{flex:0 0 auto}
.mini-result{display:flex;align-items:center;gap:11px;padding:10px 0;border-bottom:1px solid var(--line)}
.mini-result:last-child{border-bottom:0;padding-bottom:0}
.mini-result:first-child{padding-top:0}
.mini-result .score{width:40px;height:40px;border-radius:10px;display:grid;place-items:center;background:var(--teal-50);color:var(--teal-600);font-family:var(--font-display);font-weight:800;font-size:.78rem;flex:0 0 auto}
.mini-result .score.low{background:var(--warning-soft);color:var(--warning)}
.mini-result strong{display:block;font-size:.76rem;color:var(--navy-900);line-height:1.5;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:180px}
.mini-result small{display:block;font-size:.64rem;color:var(--muted)}
.announcement{padding:13px 14px;border-radius:11px;background:var(--surface-2);border:1px solid var(--line);margin-bottom:9px}
.announcement:last-child{margin-bottom:0}
.announcement small{font-size:.6rem;font-weight:800;color:var(--teal-600);letter-spacing:.05em}
.announcement p{font-size:.76rem;color:var(--ink-2);line-height:1.7;margin:3px 0 0}
.teacher-callout{padding:17px;border-radius:13px;background:var(--navy-900);color:#fff;position:relative;overflow:hidden}
.teacher-callout::before{content:"";position:absolute;width:100px;height:100px;border-radius:50%;background:rgba(45,212,191,.14);top:-40px;left:-20px}
.teacher-callout h4{font-size:.82rem;color:#fff;margin-bottom:5px;position:relative}
.teacher-callout p{font-size:.7rem;color:#9db9ca;margin:0 0 10px;position:relative;line-height:1.7}
.teacher-callout a{font-size:.72rem;font-weight:700;color:var(--teal-400);display:inline-flex;align-items:center;gap:5px;position:relative}

/* ---------- 21. Lesson page ---------- */
.lesson-hero{position:relative;border-radius:var(--radius-lg);padding:32px 34px;color:#fff;overflow:hidden;background:linear-gradient(120deg,var(--navy-900),#0c3a52);margin-bottom:24px}
.lesson-hero::before{content:"";position:absolute;inset:0;background:radial-gradient(500px 300px at 90% 20%,color-mix(in srgb,var(--level) 35%,transparent),transparent 70%);opacity:.75}
.lesson-hero::after{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.07) 1px,transparent 1px);background-size:22px 22px;opacity:.3;mask-image:linear-gradient(90deg,#000,transparent 70%);-webkit-mask-image:linear-gradient(90deg,#000,transparent 70%)}
.lesson-hero > *{position:relative;z-index:1}
.lesson-hero .meta-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.lesson-hero h1{font-size:clamp(1.6rem,3vw,2.35rem);color:#fff;margin-bottom:9px;max-width:820px}
.lesson-hero p{color:#b9d4e2;font-size:.9rem;line-height:1.85;max-width:720px;margin:0}
.lesson-hero .hero-foot{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:18px;font-size:.72rem;color:#9fc0d3}
.lesson-hero .hero-foot span{display:inline-flex;align-items:center;gap:6px}
.lesson-hero .hero-foot .icon{width:15px;height:15px;color:var(--teal-400)}
.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:24px;align-items:start}
.lesson-body{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:34px 36px;box-shadow:var(--shadow-xs)}
.prose{color:var(--ink-2);font-size:.94rem;line-height:2}
.prose > *:first-child{margin-top:0}
.prose h2{font-size:1.35rem;color:var(--navy-900);margin:30px 0 12px;padding-bottom:9px;border-bottom:2px solid var(--teal-50);display:flex;align-items:center;gap:9px}
.prose h2:first-child{margin-top:0}
.prose h2 .num{display:inline-grid;place-items:center;width:27px;height:27px;border-radius:8px;background:var(--teal-50);color:var(--teal-600);font-size:.72rem;font-weight:800;flex:0 0 auto;font-family:var(--font-display)}
.prose h3{font-size:1.05rem;color:var(--navy-900);margin:20px 0 8px}
.prose p{margin:0 0 13px;color:var(--ink-2)}
.prose ul,.prose ol{margin:0 0 16px;padding-inline-start:0;display:grid;gap:8px}
.prose ul li,.prose ol li{position:relative;padding-inline-start:22px;color:var(--ink-2)}
.prose ul li::before{content:"";position:absolute;right:2px;top:11px;width:7px;height:7px;border-radius:2px;background:var(--teal-500);transform:rotate(45deg)}
.prose ol{counter-reset:item}
.prose ol li{counter-increment:item}
.prose ol li::before{content:counter(item);position:absolute;right:0;top:1px;width:18px;height:18px;border-radius:50%;background:var(--teal-50);color:var(--teal-600);font-size:.6rem;font-weight:800;display:grid;place-items:center}
.prose strong{color:var(--navy-900);font-weight:700}
.prose .highlight{background:linear-gradient(transparent 58%,rgba(244,199,107,.45) 58%);padding:0 2px}
.prose .note{padding:14px 16px;border-inline-start:3px solid var(--teal-500);background:var(--teal-50);border-radius:0 10px 10px 0;font-size:.86rem;margin:16px 0;color:var(--ink-2)}
.prose .note strong{color:var(--teal-600)}
.prose .warning{padding:14px 16px;border-inline-start:3px solid var(--gold-500);background:var(--gold-100);border-radius:0 10px 10px 0;font-size:.86rem;margin:16px 0;color:#6d4a09}
.prose table{width:100%;border-collapse:collapse;margin:16px 0;font-size:.83rem;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.prose th,.prose td{padding:8px 12px;border-bottom:1px solid var(--line);text-align:right}
.prose th{background:var(--surface-2);color:var(--navy-900);font-weight:700}
.prose tr:last-child td{border-bottom:0}
.prose .formula{display:flex;align-items:center;justify-content:center;gap:10px;padding:17px;margin:16px 0;background:var(--navy-900);color:#fff;border-radius:12px;font-family:var(--font-math);font-size:1.15rem;direction:ltr;letter-spacing:.02em;text-align:center;flex-wrap:wrap}
.prose .formula small{font-family:var(--font-body);font-size:.65rem;color:#8fb3c9;direction:rtl;letter-spacing:0}
.lesson-figure{margin:20px 0;border:1px solid var(--line);border-radius:14px;padding:16px;background:var(--surface-2)}
.lesson-figure svg{width:100%;height:auto;max-height:260px}
.lesson-figure figcaption{text-align:center;font-size:.72rem;color:var(--muted);margin-top:9px}
.objectives{background:linear-gradient(135deg,var(--teal-50),#fff);border:1px solid rgba(13,143,141,.18);border-radius:16px;padding:20px;margin-bottom:24px}
.objectives h2{font-size:.9rem;color:var(--navy-900);display:flex;align-items:center;gap:8px;margin-bottom:12px;border:0;padding:0}
.objectives h2 .icon{color:var(--teal-600);width:18px;height:18px}
.objectives ul{display:grid;gap:8px;margin:0}
.objectives li{position:relative;padding-inline-start:20px;font-size:.82rem;color:var(--ink-2);line-height:1.75}
.objectives li::before{content:"";position:absolute;right:2px;top:9px;width:8px;height:8px;border-radius:50%;border:2px solid var(--teal-500)}
.key-points{background:var(--surface-2);border:1px solid var(--line);border-radius:14px;padding:20px;margin-top:24px}
.key-points h3{font-size:.88rem;color:var(--navy-900);display:flex;align-items:center;gap:7px;margin-bottom:11px}
.key-points h3 .icon{color:var(--gold-500)}
.key-points ul{display:grid;gap:7px}
.key-points li{display:flex;align-items:flex-start;gap:8px;font-size:.81rem;color:var(--ink-2);line-height:1.75}
.key-points li .icon{width:15px;height:15px;color:var(--success);margin-top:4px;flex:0 0 auto}
.lesson-side{display:grid;gap:16px;position:sticky;top:calc(var(--header-h) + 18px)}
.side-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:var(--shadow-xs)}
.side-card h3{font-size:.86rem;color:var(--navy-900);margin-bottom:12px;display:flex;align-items:center;gap:7px}
.side-card h3 .icon{width:17px;height:17px;color:var(--teal-600)}
.file-list{display:grid;gap:8px}
.file-item{display:flex;align-items:center;gap:10px;padding:10px 11px;border:1px solid var(--line);border-radius:10px;transition:.2s;background:#fff}
.file-item:hover{border-color:var(--teal-400);background:var(--teal-50);transform:translateX(-2px)}
.file-item .ficon{width:36px;height:36px;border-radius:8px;display:grid;place-items:center;font-size:.57rem;font-weight:800;color:#fff;flex:0 0 auto;letter-spacing:.03em}
.file-item .ficon.pdf{background:#c0392b}
.file-item .ficon.doc{background:#2b6cb0}
.file-item strong{display:block;font-size:.74rem;color:var(--navy-900);line-height:1.4}
.file-item small{display:block;font-size:.61rem;color:var(--muted)}
.file-item .icon{margin-inline-start:auto;width:15px;height:15px;color:var(--muted-2)}
.video-mini{position:relative;border-radius:10px;overflow:hidden;aspect-ratio:16/9;background:linear-gradient(135deg,#0b2742,#13466e);display:grid;place-items:center;cursor:pointer;border:0;width:100%}
.video-mini img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.72}
.video-mini::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent,rgba(5,22,38,.65))}
.video-mini .play{position:relative;z-index:1;width:46px;height:46px;border-radius:50%;background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.35);display:grid;place-items:center;color:#fff;backdrop-filter:blur(6px);transition:.2s}
.video-mini:hover .play{background:var(--teal-500);border-color:var(--teal-500);transform:scale(1.06)}
.video-mini span{position:absolute;z-index:1;bottom:10px;right:10px;font-size:.62rem;color:#fff;background:rgba(5,22,38,.66);padding:3px 8px;border-radius:5px}
.side-note{font-size:.66rem;color:var(--muted);line-height:1.7;margin-top:9px}
.quiz-cta{background:linear-gradient(135deg,var(--navy-900),#0e3f58);color:#fff;border-radius:16px;padding:20px;position:relative;overflow:hidden}
.quiz-cta::before{content:"";position:absolute;width:110px;height:110px;border-radius:50%;background:rgba(45,212,191,.15);top:-45px;left:-30px}
.quiz-cta > *{position:relative;z-index:1}
.quiz-cta small{font-size:.62rem;font-weight:800;color:var(--teal-400);letter-spacing:.08em}
.quiz-cta h3{font-size:.9rem;color:#fff;margin:4px 0 5px}
.quiz-cta p{font-size:.7rem;color:#9db9ca;line-height:1.6;margin:0 0 12px}
.quiz-cta .btn{min-height:38px;font-size:.74rem;padding:7px 13px;width:100%}
.lesson-progress{display:flex;align-items:center;gap:9px;font-size:.72rem;color:var(--muted);margin-top:10px}
.lesson-progress .progress{flex:1}
.lesson-nav{display:flex;align-items:stretch;justify-content:space-between;gap:12px;margin-top:24px}
.lesson-nav a{display:flex;align-items:center;gap:10px;padding:12px 15px;border:1px solid var(--line);border-radius:11px;background:#fff;font-size:.76rem;font-weight:700;color:var(--ink-2);max-width:48%;transition:.2s}
.lesson-nav a:hover{border-color:var(--teal-400);color:var(--teal-600)}
.lesson-nav a .icon{width:16px;height:16px}
.lesson-nav a small{display:block;font-size:.6rem;color:var(--muted);font-weight:600}
.lesson-nav a span{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:240px}
.lesson-nav a.next{margin-inline-start:auto;text-align:left}

/* ---------- 22. Library ---------- */
.filter-bar{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px 18px;display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:22px;box-shadow:var(--shadow-xs)}
.filter-search{position:relative;flex:1;min-width:230px}
.filter-search .input{padding-inline-start:44px;padding-inline-end:15px;min-height:44px;border-radius:10px}
.filter-search .icon{position:absolute;top:50%;transform:translateY(-50%);right:14px;width:18px;height:18px;color:var(--muted-2);pointer-events:none}
.filter-chips{display:flex;align-items:center;gap:7px;flex-wrap:wrap}
.filter-chips .chip{font-size:.75rem;padding:6px 12px;min-height:38px}
.filter-count{font-size:.72rem;color:var(--muted);margin-inline-start:auto;white-space:nowrap}
.resource-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.resource-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;transition:.2s;display:flex;flex-direction:column;min-height:175px}
.resource-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-sm);border-color:var(--line-2)}
.resource-top{display:flex;align-items:flex-start;justify-content:space-between;gap:8px;margin-bottom:10px}
.resource-card .ficon{width:43px;height:43px;border-radius:10px;display:grid;place-items:center;font-size:.62rem;font-weight:800;color:#fff;letter-spacing:.03em;flex:0 0 auto}
.resource-card .ficon.pdf{background:linear-gradient(135deg,#e05a5a,#b52d2d)}
.resource-card .ficon.doc{background:linear-gradient(135deg,#3b82c4,#1e4f85)}
.resource-card h3{font-size:.85rem;color:var(--navy-900);line-height:1.55;margin-bottom:4px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.resource-card p{font-size:.68rem;color:var(--muted);line-height:1.6;margin:0 0 12px}
.resource-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:8px;padding-top:10px;border-top:1px solid var(--line)}
.resource-foot .tag{font-size:.6rem;padding:3px 7px}
.resource-foot .dl{display:inline-flex;align-items:center;gap:4px;font-size:.68rem;font-weight:700;color:var(--teal-600)}
.resource-foot .dl:hover{text-decoration:underline}
.library-empty{grid-column:1/-1}

/* ---------- 23. Videos ---------- */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.video-card{background:#fff;border:1px solid var(--line);border-radius:15px;overflow:hidden;transition:.22s;display:flex;flex-direction:column}
.video-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--line-2)}
.video-thumb{position:relative;display:block;aspect-ratio:16/9;background:#0b2742;border:0;width:100%;overflow:hidden;cursor:pointer}
.video-thumb img{width:100%;height:100%;object-fit:cover;opacity:.85;transition:.3s}
.video-card:hover .video-thumb img{transform:scale(1.04);opacity:1}
.video-thumb::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(5,22,38,.04),rgba(5,22,38,.55))}
.video-thumb .play{position:absolute;z-index:2;top:50%;left:50%;transform:translate(-50%,-50%);width:54px;height:54px;border-radius:50%;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.4);display:grid;place-items:center;color:#fff;backdrop-filter:blur(8px);transition:.2s}
.video-card:hover .video-thumb .play{background:var(--teal-500);border-color:var(--teal-500);transform:translate(-50%,-50%) scale(1.06)}
.video-thumb .yt{position:absolute;z-index:2;bottom:10px;left:10px;font-size:.6rem;color:#fff;background:rgba(5,22,38,.65);padding:2px 7px;border-radius:4px;letter-spacing:.02em}
.video-body{padding:15px 16px;display:flex;flex-direction:column;flex:1}
.video-body h3{font-size:.86rem;color:var(--navy-900);line-height:1.55;margin-bottom:5px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-body p{font-size:.68rem;color:var(--muted);margin:0 0 10px}
.video-meta{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:auto;padding-top:9px;border-top:1px solid var(--line);font-size:.62rem;color:var(--muted)}
.video-note{display:flex;align-items:flex-start;gap:9px;padding:12px 15px;border:1px dashed var(--line-2);border-radius:11px;background:var(--surface-2);font-size:.73rem;color:var(--muted);line-height:1.7;margin-bottom:20px}
.video-note .icon{color:var(--teal-600);margin-top:2px;flex:0 0 auto;width:17px;height:17px}

/* ---------- 24. Quiz ---------- */
.quiz-page{background:#eef4f8;min-height:100vh}
.quiz-shell{width:min(820px,calc(100% - 32px));margin:0 auto;padding:32px 0 60px}
.quiz-top{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:20px;flex-wrap:wrap}
.quiz-top .brand-name{color:var(--navy-900);font-size:1.1rem}
.quiz-top .brand-sub{color:var(--muted)}
.quiz-timer{display:inline-flex;align-items:center;gap:7px;padding:8px 14px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:.82rem;font-weight:800;color:var(--navy-900);font-variant-numeric:tabular-nums;box-shadow:var(--shadow-xs)}
.quiz-timer .icon{width:16px;height:16px;color:var(--teal-600)}
.quiz-timer.is-low{background:var(--danger-soft);border-color:rgba(192,57,43,.2);color:var(--danger)}
.quiz-timer.is-low .icon{color:var(--danger)}
.quiz-head{background:#fff;border:1px solid var(--line);border-radius:17px;padding:26px 28px;margin-bottom:18px;box-shadow:var(--shadow-xs)}
.quiz-head .badge{margin-bottom:10px}
.quiz-head h1{font-size:1.45rem;color:var(--navy-900);margin-bottom:7px}
.quiz-head p{font-size:.84rem;color:var(--muted);margin:0;line-height:1.8}
.quiz-facts{display:flex;gap:18px;flex-wrap:wrap;margin-top:16px;padding-top:14px;border-top:1px solid var(--line);font-size:.72rem;color:var(--muted)}
.quiz-facts span{display:inline-flex;align-items:center;gap:6px}
.quiz-facts .icon{width:15px;height:15px;color:var(--teal-600)}
.quiz-progress{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.quiz-progress .progress{flex:1;height:7px}
.quiz-progress span{font-size:.68rem;font-weight:700;color:var(--muted);white-space:nowrap}
.q-card{background:#fff;border:1px solid var(--line);border-radius:17px;padding:26px 28px;box-shadow:var(--shadow-xs);animation:fadeIn .25s ease}
.q-num{font-size:.66rem;font-weight:800;color:var(--teal-600);letter-spacing:.08em;margin-bottom:8px;display:flex;align-items:center;gap:7px}
.q-num .dot{background:var(--teal-500)}
.q-card h2{font-size:1.08rem;color:var(--navy-900);line-height:1.75;margin-bottom:18px}
.q-options{display:grid;gap:9px}
.option{display:flex;align-items:center;gap:12px;width:100%;padding:13px 15px;border:1.5px solid var(--line);border-radius:11px;background:#fff;text-align:right;font-size:.86rem;color:var(--ink-2);transition:.16s;line-height:1.6}
.option:hover{border-color:var(--teal-400);background:var(--teal-50)}
.option .letter{width:28px;height:28px;border-radius:8px;background:var(--surface-2);border:1px solid var(--line);display:grid;place-items:center;font-size:.68rem;font-weight:800;color:var(--muted);flex:0 0 auto;transition:.16s}
.option.is-selected{border-color:var(--teal-500);background:var(--teal-50);box-shadow:0 0 0 3px rgba(18,168,164,.09)}
.option.is-selected .letter{background:var(--teal-600);border-color:var(--teal-600);color:#fff}
.option.is-correct{border-color:rgba(18,128,92,.45);background:var(--success-soft);color:var(--success)}
.option.is-correct .letter{background:var(--success);border-color:var(--success);color:#fff}
.option.is-wrong{border-color:rgba(192,57,43,.4);background:var(--danger-soft);color:var(--danger)}
.option.is-wrong .letter{background:var(--danger);border-color:var(--danger);color:#fff}
.option:disabled{cursor:default;opacity:1}
.quiz-actions{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:18px}
.quiz-actions .btn{min-width:110px}
.q-dots{display:flex;align-items:center;justify-content:center;gap:6px;margin-top:18px;flex-wrap:wrap}
.q-dot{width:28px;height:28px;border-radius:8px;border:1px solid var(--line);background:#fff;font-size:.66rem;font-weight:700;color:var(--muted);display:grid;place-items:center;transition:.15s}
.q-dot:hover{border-color:var(--teal-400);color:var(--teal-600)}
.q-dot.is-current{background:var(--navy-800);border-color:var(--navy-800);color:#fff}
.q-dot.is-answered{background:var(--teal-50);border-color:var(--teal-400);color:var(--teal-600)}
.q-dot.is-correct{background:var(--success-soft);border-color:rgba(18,128,92,.3);color:var(--success)}
.q-dot.is-wrong{background:var(--danger-soft);border-color:rgba(192,57,43,.3);color:var(--danger)}
.quiz-intro{text-align:center;padding:46px 30px;background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow-sm)}
.quiz-intro .icon-tile{width:66px;height:66px;border-radius:19px;margin-bottom:18px}
.quiz-intro h1{font-size:1.6rem;color:var(--navy-900);margin-bottom:7px}
.quiz-intro > p{font-size:.88rem;color:var(--muted);max-width:540px;margin:0 auto 24px;line-height:1.9}
.quiz-intro .facts{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin-bottom:26px}
.quiz-intro .fact{padding:11px 17px;border-radius:12px;background:var(--surface-2);border:1px solid var(--line);font-size:.75rem;color:var(--ink-2);display:flex;align-items:center;gap:8px;min-width:110px;flex-direction:column;font-weight:700;line-height:1.4}
.quiz-intro .fact .icon{width:19px;height:19px;color:var(--teal-600)}
.quiz-intro .fact small{display:block;font-size:.62rem;color:var(--muted);font-weight:600}
.quiz-result{background:#fff;border:1px solid var(--line);border-radius:20px;padding:34px;box-shadow:var(--shadow-sm)}
.result-head{display:flex;align-items:center;gap:26px;padding-bottom:24px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.result-ring{--size:148px;--thickness:11px;--ring-inner:#fff;background:conic-gradient(var(--teal-500) calc(var(--score)*1%),#e8eff5 0)}
.result-ring::before{background:#fff}
.result-ring strong{color:var(--navy-900);font-size:1.8rem}
.result-ring small{color:var(--muted)}
.result-copy{flex:1;min-width:220px}
.result-copy .badge{margin-bottom:7px}
.result-copy h1{font-size:1.5rem;color:var(--navy-900);margin-bottom:4px}
.result-copy p{font-size:.82rem;color:var(--muted);margin:0;line-height:1.8}
.result-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:20px 0}
.result-stat{padding:13px;border-radius:11px;background:var(--surface-2);border:1px solid var(--line);text-align:center}
.result-stat strong{display:block;font-family:var(--font-display);font-size:1.3rem;color:var(--navy-900);line-height:1.2}
.result-stat span{font-size:.65rem;color:var(--muted)}
.review-list{display:grid;gap:10px;margin-top:18px}
.review-item{border:1px solid var(--line);border-radius:12px;padding:14px 16px;background:#fff}
.review-item.correct{border-inline-start:3px solid var(--success)}
.review-item.wrong{border-inline-start:3px solid var(--danger)}
.review-head{display:flex;align-items:flex-start;gap:10px;margin-bottom:8px}
.review-badge{width:23px;height:23px;border-radius:50%;display:grid;place-items:center;flex:0 0 auto;font-size:.62rem;margin-top:2px}
.review-item.correct .review-badge{background:var(--success);color:#fff}
.review-item.wrong .review-badge{background:var(--danger);color:#fff}
.review-head strong{font-size:.82rem;color:var(--navy-900);line-height:1.65}
.review-body{font-size:.74rem;color:var(--muted);line-height:1.7;padding-inline-start:33px}
.review-body b{color:var(--success)}
.review-body .why{display:block;margin-top:3px;color:var(--ink-2)}
.quiz-result-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px;padding-top:18px;border-top:1px solid var(--line)}

/* ---------- 25. Results ---------- */
.results-hero{background:linear-gradient(120deg,var(--navy-900),#0c3a52);border-radius:var(--radius-lg);padding:30px 34px;color:#fff;margin-bottom:24px;position:relative;overflow:hidden}
.results-hero::before{content:"";position:absolute;inset:0;background:radial-gradient(500px 300px at 90% 10%,rgba(45,212,191,.18),transparent 70%)}
.results-hero > *{position:relative;z-index:1}
.results-hero h1{font-size:1.7rem;color:#fff;margin-bottom:5px}
.results-hero p{color:#a9c8d8;font-size:.85rem;margin:0}
.results-summary{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:24px}
.results-layout{display:grid;grid-template-columns:1fr 340px;gap:22px;align-items:start}
.result-table-wrap{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:var(--shadow-xs)}
.chart-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:var(--shadow-xs)}
.chart-card h3{font-size:.9rem;color:var(--navy-900);margin-bottom:16px}
.bar-row{display:flex;align-items:center;gap:10px;margin-bottom:11px}
.bar-row .label{width:82px;font-size:.64rem;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bar-wrap{flex:1;height:9px;border-radius:99px;background:#eef3f7;overflow:hidden}
.bar-wrap span{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--teal-500),var(--teal-400))}
.bar-row .val{width:32px;font-size:.63rem;font-weight:800;color:var(--ink-2);text-align:left;direction:ltr}
.score-pill{display:inline-flex;align-items:center;justify-content:center;min-width:52px;padding:3px 8px;border-radius:7px;font-size:.68rem;font-weight:800;background:var(--teal-50);color:var(--teal-600);direction:ltr}
.score-pill.low{background:var(--warning-soft);color:var(--warning)}
.score-pill.mid{background:#eef3ff;color:#3156a8}

/* ---------- 26. Tables ---------- */
.table-wrap{width:100%;overflow-x:auto}
.data-table{width:100%;border-collapse:collapse;font-size:.78rem}
.data-table th{background:var(--surface-2);color:var(--muted);font-size:.66rem;font-weight:800;text-align:right;padding:11px 14px;border-bottom:1px solid var(--line);white-space:nowrap;letter-spacing:.02em}
.data-table td{padding:11px 14px;border-bottom:1px solid var(--line);color:var(--ink-2);vertical-align:middle}
.data-table tbody tr:last-child td{border-bottom:0}
.data-table tbody tr:hover{background:#fbfdfe}
.data-table .main-cell strong{display:block;font-size:.76rem;color:var(--navy-900);font-weight:700}
.data-table .main-cell small{display:block;font-size:.63rem;color:var(--muted)}
.data-table .actions{display:flex;align-items:center;gap:4px;justify-content:flex-end}
.data-table .actions button,.data-table .actions a{width:29px;height:29px;border-radius:7px;display:grid;place-items:center;color:var(--muted);border:1px solid transparent;transition:.15s}
.data-table .actions button:hover,.data-table .actions a:hover{background:var(--surface-2);border-color:var(--line);color:var(--teal-600)}
.data-table .actions .del:hover{background:var(--danger-soft);border-color:rgba(192,57,43,.15);color:var(--danger)}
.level-tag{display:inline-flex;padding:3px 8px;border-radius:6px;font-size:.62rem;font-weight:800;background:var(--level-soft);color:var(--navy-800);border-inline-start:3px solid var(--level);white-space:nowrap}
.status-pill{display:inline-flex;align-items:center;gap:4px;font-size:.62rem;font-weight:700;padding:2px 7px;border-radius:5px;background:var(--success-soft);color:var(--success)}
.status-pill.off{background:#eef3f7;color:var(--muted)}
.table-empty{padding:30px;text-align:center;color:var(--muted);font-size:.8rem}

/* ---------- 27. Teacher ---------- */
.teacher-body{background:#eef3f7}
.teacher-layout{display:grid;grid-template-columns:250px 1fr;gap:0;min-height:calc(100vh - var(--header-h))}
.teacher-side{background:var(--navy-900);padding:26px 18px;position:sticky;top:var(--header-h);height:calc(100vh - var(--header-h));overflow-y:auto}
.teacher-side .side-profile{display:flex;align-items:center;gap:11px;padding:0 8px 20px;border-bottom:1px solid rgba(255,255,255,.1);margin-bottom:18px}
.teacher-side .side-profile .avatar{width:40px;height:40px;background:linear-gradient(145deg,var(--gold-400),var(--gold-500));color:var(--navy-900)}
.teacher-side .side-profile strong{display:block;font-size:.78rem;color:#fff}
.teacher-side .side-profile small{display:block;font-size:.62rem;color:#8fb3c9}
.side-nav{display:grid;gap:3px}
.side-nav button,.side-nav a{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:9px;font-size:.8rem;font-weight:600;color:#a9c5d5;text-align:right;transition:.15s;width:100%}
.side-nav button:hover,.side-nav a:hover{background:rgba(255,255,255,.06);color:#fff}
.side-nav button.is-active,.side-nav a.is-active{background:rgba(45,212,191,.12);color:var(--teal-400);position:relative}
.side-nav button.is-active::before{content:"";position:absolute;right:-18px;top:10px;bottom:10px;width:3px;border-radius:3px;background:var(--teal-400)}
.side-nav .icon{width:18px;height:18px}
.side-nav .sep{height:1px;background:rgba(255,255,255,.08);margin:10px 4px}
.side-foot{margin-top:22px;padding:12px;border-radius:10px;background:rgba(255,255,255,.05);font-size:.64rem;color:#8fb3c9;line-height:1.7}
.side-foot strong{color:var(--teal-400)}
.teacher-main{padding:28px 32px 50px;min-width:0}
.teacher-top{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;margin-bottom:24px;flex-wrap:wrap}
.teacher-top h1{font-size:1.55rem;color:var(--navy-900);margin-bottom:2px}
.teacher-top p{font-size:.8rem;color:var(--muted);margin:0}
.teacher-top-actions{display:flex;gap:8px;flex-wrap:wrap}
.tab-pane{display:none}
.tab-pane.is-active{display:block;animation:fadeIn .25s ease}
.teacher-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:22px}
.teacher-stat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:17px 18px;display:flex;align-items:center;gap:12px;box-shadow:var(--shadow-xs)}
.teacher-stat .icon-tile{width:42px;height:42px;border-radius:11px}
.teacher-stat strong{display:block;font-family:var(--font-display);font-size:1.4rem;color:var(--navy-900);line-height:1.2}
.teacher-stat span{display:block;font-size:.66rem;color:var(--muted);font-weight:600;margin-top:2px}
.teacher-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:18px;align-items:start}
.teacher-panel{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px;box-shadow:var(--shadow-xs);margin-bottom:18px}
.teacher-panel-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:14px;flex-wrap:wrap}
.teacher-panel-head h2{font-size:.92rem;color:var(--navy-900)}
.teacher-panel-head .btn{min-height:34px;font-size:.72rem;padding:5px 11px}
.teacher-toolbar{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-bottom:15px}
.teacher-toolbar .input,.teacher-toolbar .select{min-height:40px;font-size:.78rem;max-width:200px}
.teacher-toolbar .search{flex:1;min-width:180px;max-width:none}
.tab-pane .panel{box-shadow:none;border:1px solid var(--line);padding:0;overflow:hidden;background:#fff;border-radius:14px}
.settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start}
.security-note{display:flex;align-items:flex-start;gap:10px;padding:13px 15px;border-radius:11px;background:var(--warning-soft);border:1px solid rgba(168,107,11,.15);color:#6d4a09;font-size:.72rem;line-height:1.7}
.security-note .icon{flex:0 0 auto;color:var(--warning);margin-top:2px}
.content-stat-row{display:flex;align-items:center;justify-content:space-between;padding:9px 0;border-bottom:1px solid var(--line);font-size:.76rem;color:var(--ink-2)}
.content-stat-row:last-child{border-bottom:0}
.content-stat-row b{color:var(--navy-900)}
.teacher-login{min-height:calc(100vh - var(--header-h));display:grid;place-items:center;padding:40px 20px;background:radial-gradient(600px 400px at 50% 0%,rgba(45,212,191,.1),transparent 70%)}
.teacher-login .auth-card{max-width:430px}
.pin-input{letter-spacing:.3em;text-align:center;font-weight:800;font-size:1.15rem;direction:ltr;font-family:Consolas,monospace}

/* ---------- 28. Modal / toast ---------- */
.modal{position:fixed;inset:0;z-index:120;display:none;align-items:center;justify-content:center;padding:20px}
.modal.is-open{display:flex;animation:fadeIn .2s ease}
.modal-backdrop{position:absolute;inset:0;background:rgba(5,22,38,.72);backdrop-filter:blur(6px)}
.modal-card{position:relative;z-index:1;width:min(540px,100%);max-height:88vh;overflow-y:auto;background:#fff;border-radius:18px;padding:26px;box-shadow:var(--shadow-lg);animation:popIn .25s var(--ease)}
@keyframes popIn{from{opacity:0;transform:translateY(14px) scale(.98)}to{opacity:1;transform:none}}
.modal-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:18px}
.modal-head h3{font-size:1.1rem;color:var(--navy-900)}
.modal-head p{font-size:.76rem;color:var(--muted);margin:3px 0 0}
.modal-close{width:34px;height:34px;border-radius:8px;display:grid;place-items:center;color:var(--muted);background:var(--surface-2);flex:0 0 auto}
.modal-close:hover{background:var(--danger-soft);color:var(--danger)}
.modal-actions{display:flex;justify-content:flex-end;gap:9px;margin-top:20px;padding-top:16px;border-top:1px solid var(--line)}
.video-modal .modal-card{width:min(900px,100%);padding:0;background:#071c2f;overflow:hidden}
.video-modal .video-frame{position:relative;aspect-ratio:16/9;background:#000}
.video-modal iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.video-modal .vm-info{padding:16px 20px;color:#fff;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.video-modal .vm-info strong{font-size:.9rem;font-weight:700}
.video-modal .vm-info small{font-size:.68rem;color:#8fb3c9}
.video-modal .modal-close{position:absolute;top:10px;left:10px;z-index:2;background:rgba(5,22,38,.65);color:#fff;border:1px solid rgba(255,255,255,.2);border-radius:50%}
.toast-stack{position:fixed;bottom:22px;left:22px;z-index:200;display:flex;flex-direction:column;gap:9px;max-width:360px}
.toast{display:flex;align-items:flex-start;gap:10px;padding:12px 15px;background:#fff;border:1px solid var(--line);border-radius:11px;box-shadow:var(--shadow);font-size:.8rem;color:var(--ink-2);animation:toastIn .3s var(--ease);line-height:1.6}
.toast .icon{width:18px;height:18px;flex:0 0 auto;margin-top:2px}
.toast.success .icon{color:var(--success)}
.toast.error .icon{color:var(--danger)}
.toast.info .icon{color:var(--teal-600)}
.toast.is-out{animation:toastOut .25s ease forwards}
@keyframes toastIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
@keyframes toastOut{to{opacity:0;transform:translateY(8px)}}

/* ---------- 28.b FAQ / utilities ---------- */
.faq-list{display:grid;gap:10px;max-width:820px;margin-inline:auto}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:13px;padding:0;overflow:hidden;transition:border-color .2s,box-shadow .2s}
.faq-item[open]{border-color:rgba(13,143,141,.25);box-shadow:var(--shadow-xs)}
.faq-item summary{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:16px 19px;font-size:.88rem;font-weight:700;color:var(--navy-900);cursor:pointer;list-style:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary .icon{width:17px;height:17px;color:var(--muted);transition:transform .2s;flex:0 0 auto}
.faq-item[open] summary .icon{transform:rotate(180deg);color:var(--teal-600)}
.faq-item p{padding:0 19px 17px;font-size:.83rem;color:var(--muted);line-height:1.9;margin:0}
.mini-video{cursor:pointer;border:0;width:100%}
.badge-dark .icon{color:var(--gold-400)}
@media print{.faq-item{break-inside:avoid}}

/* ---------- 29. Print ---------- */
.print-only{display:none}
@media print{
  @page{size:A4;margin:14mm}
  body{background:#fff !important;font-size:11pt}
  .site-header,.site-footer,.no-print,.quiz-top,.toast-stack,.mobile-nav{display:none !important}
  .page-wrap{padding:0}
  .container,.container-narrow,.quiz-shell{width:100%;max-width:none}
  .card,.panel,.lesson-body,.side-card,.teacher-panel{box-shadow:none !important;border-color:#ddd}
  .print-only{display:block !important}
  .lesson-layout,.dash-layout{display:block}
  .lesson-side{display:none}
  .results-layout{display:block}
  .results-layout aside{display:none}
  .results-hero{background:#fff !important;color:#000;border:1px solid #ddd;padding:18px 20px}
  .results-hero::before{display:none}
  .results-hero h1,.results-hero p{color:#000}
  .results-hero .badge{background:#eef3f7;color:#29465e;border-color:#cfdde8}
  .results-summary{grid-template-columns:repeat(4,1fr);gap:8px}
  .dash-stat{box-shadow:none;border-color:#ddd}
  .result-table-wrap{border-color:#ddd}
  .result-table-wrap .panel-head{padding:0 0 8px !important}
  .data-table{font-size:9pt}
  .data-table th,.data-table td{padding:7px 9px}
  .badge,.score-pill,.level-tag,.status-pill{border:1px solid #cfdde8 !important;background:#f4f8fb !important;color:#29465e !important}
  .btn,.btn-group{display:none !important}
  a{text-decoration:none;color:#000}
}

/* ---------- 30. Responsive ---------- */
@media (max-width:1080px){
  .hero-grid{grid-template-columns:1fr;gap:26px}
  .hero-copy{max-width:none}
  .hero-visual{min-height:360px;order:2}
  .atom-wrap{width:min(360px,80%)}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .level-grid{grid-template-columns:repeat(2,1fr)}
  .dash-layout{grid-template-columns:1fr}
  .dash-aside{position:static;grid-template-columns:1fr 1fr}
  .lesson-layout{grid-template-columns:1fr}
  .lesson-side{position:static;grid-template-columns:1fr 1fr}
  .resource-grid,.video-grid{grid-template-columns:repeat(2,1fr)}
  .results-layout{grid-template-columns:1fr}
  .teacher-layout{grid-template-columns:220px 1fr}
  .teacher-grid{grid-template-columns:1fr}
  .showcase{grid-template-columns:1fr;gap:30px}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:30px}
  .footer-grid > :last-child{grid-column:1/-1}
}
@media (max-width:880px){
  .auth-main{grid-template-columns:1fr}
  .auth-brand{padding:40px 30px;min-height:300px}
  .auth-brand h1{font-size:1.9rem}
  .auth-brand p{font-size:.88rem}
  .auth-visual{display:none}
  .auth-panel{padding:34px 20px 50px}
  .dash-hero{grid-template-columns:1fr;padding:28px}
  .dash-side{justify-content:flex-start}
  .dash-stats,.results-summary,.teacher-stats{grid-template-columns:1fr 1fr}
  .stats-strip .inner{grid-template-columns:1fr 1fr}
  .stat-item{border-inline-start:0;border-top:1px solid var(--line)}
  .stat-item:nth-child(2){border-inline-start:1px solid var(--line)}
  .stat-item:nth-child(3),.stat-item:nth-child(4){border-top:1px solid var(--line)}
  .steps{grid-template-columns:1fr 1fr;gap:30px 20px}
  .steps::before{display:none}
  .cta-band{flex-direction:column;align-items:flex-start;padding:36px 28px}
  .teacher-layout{grid-template-columns:1fr}
  .teacher-side{position:static;height:auto;display:flex;align-items:center;gap:14px;padding:12px 18px;overflow-x:auto}
  .teacher-side .side-profile{border:0;padding:0;margin:0;flex:0 0 auto}
  .side-nav{display:flex;gap:5px;flex:1;overflow-x:auto;padding-bottom:2px}
  .side-nav button,.side-nav a{white-space:nowrap;padding:8px 11px;font-size:.74rem}
  .side-nav button.is-active::before{display:none}
  .side-nav .sep,.side-foot{display:none}
  .teacher-main{padding:24px 20px 44px}
}
@media (max-width:700px){
  .container{width:calc(100% - 28px)}
  .section{padding:58px 0}
  .hero{padding:52px 0 78px}
  .hero h1{font-size:2.1rem}
  .hero-lead{font-size:.94rem}
  .hero-trust{gap:12px}
  .hero-visual{min-height:300px}
  .float-chip{padding:7px 10px;font-size:.62rem}
  .float-chip strong{font-size:.68rem}
  .float-chip small{display:none}
  .float-chip.a{right:0}
  .float-chip.b{left:0}
  .float-chip.c{display:none}
  .section-head{margin-bottom:30px}
  .feature-grid,.level-grid,.resource-grid,.video-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:26px}
  .footer-brand{grid-column:1/-1}
  .footer-grid > :last-child{grid-column:1/-1}
  .footer-bottom{flex-direction:column;text-align:center}
  .dash-stats{grid-template-columns:1fr 1fr;gap:10px}
  .dash-stat{padding:13px}
  .dash-stat .icon-tile{width:37px;height:37px}
  .dash-stat strong{font-size:1.15rem}
  .lesson-grid{grid-template-columns:1fr}
  .dash-aside{grid-template-columns:1fr}
  .lesson-body{padding:22px 20px}
  .lesson-side{grid-template-columns:1fr}
  .lesson-hero{padding:24px 20px}
  .lesson-nav{flex-direction:column}
  .lesson-nav a{max-width:none;width:100%}
  .lesson-nav a.next{margin:0}
  .filter-count{margin-inline-start:0;width:100%}
  .auth-card{padding:28px 22px}
  .demo-codes{grid-template-columns:1fr}
  .quiz-shell{padding-top:18px}
  .quiz-head,.q-card,.quiz-intro,.quiz-result{padding:20px 18px}
  .result-head{gap:16px}
  .result-ring{--size:120px}
  .result-stats{grid-template-columns:1fr}
  .quiz-actions{flex-direction:column}
  .quiz-actions .btn{width:100%}
  .q-dots{gap:4px}
  .q-dot{width:26px;height:26px;font-size:.6rem}
  .results-summary,.teacher-stats{grid-template-columns:1fr 1fr}
  .settings-grid{grid-template-columns:1fr}
  .teacher-toolbar .input,.teacher-toolbar .select{max-width:none;width:100%}
  .teacher-toolbar{flex-direction:column;align-items:stretch}
  .modal-card{padding:20px}
  .teacher-main{padding:20px 14px 40px}
  .teacher-top h1{font-size:1.3rem}
  .footer-links{gap:8px}
  .prose{font-size:.9rem}
  .prose h2{font-size:1.15rem}
  .stats-strip{margin-top:-28px}
  .stat-item{padding:16px 13px;gap:9px}
  .stat-item .icon-tile{width:38px;height:38px}
  .stat-item strong{font-size:1.15rem}
  .stat-item span{font-size:.64rem}
}
@media (max-width:440px){
  .hero h1{font-size:1.8rem}
  .hero-cta .btn{width:100%}
  .hero-cta{flex-direction:column}
  .btn-lg{padding:12px 20px}
  .header-actions .btn{padding:7px 10px}
  .header-actions .btn .icon{width:17px;height:17px}
  .brand-name{font-size:1.12rem}
  .brand-sub{font-size:.5rem}
  .dash-stats,.results-summary,.teacher-stats{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .result-head{flex-direction:column;align-items:flex-start}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important}
}