:root{
  --bg:#f4f9ff;
  --bg2:#eef7ff;
  --panel:#ffffff;
  --panel-soft:#f7fbff;
  --line:#dbe9f7;
  --ink:#0b2f6b;
  --ink-strong:#06255a;
  --muted:#58718f;
  --blue:#1268f3;
  --cyan:#13b8ef;
  --orange:#ff8a1f;
  --gold:#ffb52e;
  --green:#1cb88a;
  --red:#de5160;
  --shadow:0 18px 55px rgba(33,97,167,.13);
}
*{box-sizing:border-box}
html{background:var(--bg)}
body{
  margin:0;
  font-family:Inter,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
  background:
    radial-gradient(circle at 8% 0%,rgba(19,184,239,.16),transparent 28%),
    radial-gradient(circle at 92% 8%,rgba(255,138,31,.12),transparent 25%),
    linear-gradient(180deg,#f9fcff 0%,var(--bg) 48%,#edf6ff 100%);
  color:var(--ink);
  min-height:100vh;
}
a{color:inherit;text-decoration:none}
button,input,textarea{font:inherit}
.hidden{display:none!important}
.wrap{width:min(1120px,92vw);margin:auto}
.top{
  position:sticky;top:0;z-index:10;
  background:rgba(255,255,255,.88);
  backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(187,214,240,.85);
  box-shadow:0 8px 28px rgba(49,102,156,.06);
}
.nav{display:flex;align-items:center;justify-content:space-between;padding:12px 0}
.brand{display:flex;align-items:center;gap:12px;font-weight:900;color:var(--ink-strong)}
.brandmark{
  width:54px;height:54px;flex:0 0 54px;
  border-radius:16px;
  background:url('/assets/speakup-emblem.png') center/88% auto no-repeat,#f7fbff;
  border:1px solid #d7e9fb;
  box-shadow:0 8px 24px rgba(18,104,243,.12);
  display:block;
  overflow:hidden;
  text-indent:-9999px;
}
.brand small{color:#6a83a1!important}
.nav-actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
#userName{font-weight:800;color:#31567f}
.btn{
  border:1px solid #d5e6f6;
  border-radius:13px;
  padding:11px 17px;
  font-weight:800;
  cursor:pointer;
  background:#fff;
  color:#164d87;
  box-shadow:0 7px 18px rgba(42,93,149,.07);
  transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;
}
.btn:hover{transform:translateY(-1px);border-color:#b9d9f7;box-shadow:0 11px 24px rgba(42,93,149,.11)}
.btn.primary{background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;border-color:transparent}
.btn.gold{background:linear-gradient(135deg,#ffb52e,var(--orange));color:#fff;border-color:transparent}
.btn.red{background:#fff1f3;color:#b93849;border-color:#f3cbd1}
.hero{padding:64px 0 30px}
.eyebrow{letter-spacing:.15em;text-transform:uppercase;color:var(--blue);font-size:12px;font-weight:900}
.hero h1{font-size:clamp(40px,8vw,78px);line-height:.96;margin:10px 0 18px;color:var(--ink-strong);letter-spacing:-.04em}
.hero p{max-width:740px;color:var(--muted);font-size:18px;line-height:1.72}
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;padding:18px 0 50px}
.card{
  background:linear-gradient(180deg,#ffffff,#f9fcff);
  border:1px solid var(--line);
  border-radius:24px;
  padding:25px;
  box-shadow:var(--shadow);
  position:relative;
  overflow:hidden;
}
.card:before{content:"";position:absolute;left:0;right:0;top:0;height:4px;background:linear-gradient(90deg,var(--blue),var(--cyan),var(--orange))}
.card h2{margin:8px 0;color:var(--ink-strong)}
.card p{color:var(--muted);line-height:1.65}
.course-icon{font-size:38px;filter:drop-shadow(0 7px 12px rgba(18,104,243,.08))}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}
.tag{padding:7px 10px;border-radius:999px;background:#edf7ff;border:1px solid #d2e8fb;color:#315f8f;font-size:12px;font-weight:700}
.auth{min-height:100vh;display:grid;place-items:center;padding:30px}
.auth-card{
  width:min(530px,94vw);
  background:rgba(255,255,255,.94);
  border:1px solid #d7e8f7;
  border-radius:28px;
  padding:30px;
  box-shadow:0 28px 80px rgba(39,103,171,.17);
}
.auth-card .brand{font-size:20px}
.auth-card .brandmark{width:72px;height:72px;flex-basis:72px;border-radius:20px}
.auth-card h1{font-size:38px;line-height:1.05;margin:8px 0 14px;color:var(--ink-strong)}
.field{display:grid;gap:7px;margin:14px 0;color:#244f7a;font-weight:700}
.field input,.field textarea{width:100%;background:#f8fbff;border:1px solid #cfe1f1;color:#12395f;border-radius:13px;padding:13px;outline:none}
.field input:focus,.field textarea:focus{border-color:#6abcf3;box-shadow:0 0 0 4px rgba(19,184,239,.12)}
.notice{padding:14px;border:1px solid #cfe4f6;border-radius:14px;background:#f5fbff;color:#315f82}
.notice.good{border-color:#bce9d8;background:#effcf7;color:#226d57}
.notice.warn{border-color:#f2dca7;background:#fff9ea;color:#7a5a15}
.notice.bad{border-color:#efc3ca;background:#fff2f4;color:#a63f4c}
.section{padding:30px 0}
.section-title{display:flex;justify-content:space-between;gap:16px;align-items:end;margin-bottom:16px}
.section-title h1,.section-title h2{margin:0;color:var(--ink-strong)}
.lesson-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.lesson-card,.teacher-row,.step{background:#fff;border:1px solid var(--line);border-radius:20px;padding:20px;box-shadow:0 12px 32px rgba(43,100,157,.09)}
.lesson-card.locked,.step.locked{opacity:.5}
.step.locked{pointer-events:none}
.lesson-card.complete{border-color:#8bd7be;background:#fbfffd}
.progress{height:8px;background:#e7f1f9;border-radius:99px;overflow:hidden}
.progress>span{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--cyan),var(--orange))}
.vocab-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.vocab{background:#f8fbff;border:1px solid #d8e7f3;border-radius:15px;padding:15px;display:grid;gap:7px}
.vocab.done{border-color:#92d8c2;background:#f0fcf8}
.vocab strong{font-size:20px;color:var(--ink-strong)}
.vocab .meaning{color:#bc6a1d}
.vocab button{justify-self:start}
.video{width:100%;border-radius:16px;background:#eaf2f9;max-height:620px}
.transcript{white-space:pre-wrap;background:#f7fbff;border:1px solid #dbe9f7;border-radius:14px;padding:16px;line-height:1.75;color:#355979}
.quiz-item{padding:14px 0;border-bottom:1px solid #dceaf6}
.option{display:block;padding:9px 11px;background:#f8fbff;border:1px solid #d8e7f3;border-radius:10px;margin:7px 0}
.checkpoint{border:1px solid #f0d08b;background:linear-gradient(180deg,#fffaf0,#fff4d9);border-radius:22px;padding:24px;box-shadow:0 14px 35px rgba(185,124,19,.08)}
.status-pill{display:inline-block;padding:7px 11px;border-radius:999px;background:#e9f7ff;color:#22658e}
.teacher-table{display:grid;gap:12px}
.checks{display:flex;gap:12px;flex-wrap:wrap}
.footer{padding:38px 0;color:#6d87a2;text-align:center}
.book-frame{width:100%;height:75vh;border:1px solid #d6e7f4;border-radius:16px;background:white;box-shadow:0 14px 35px rgba(39,94,151,.08)}
.install-hint{color:#6f87a0;text-align:center;font-size:12px;margin-top:8px}
.app-splash{display:none;position:fixed;inset:0;z-index:999999;background:linear-gradient(160deg,#f9fcff 0%,#edf7ff 58%,#fff6ea 100%);place-items:center;overflow:hidden;color:var(--ink-strong)}
.standalone-app .app-splash{display:grid}
.app-splash.hide{opacity:0;visibility:hidden;transition:opacity .4s ease,visibility .4s ease}
.splash-inner{text-align:center;position:relative;z-index:2}
.splash-mark{width:132px;height:132px;border-radius:32px;margin:auto;background:url('/assets/speakup-emblem.png') center/86% auto no-repeat,#fff;border:1px solid #d8e9f7;display:block;text-indent:-9999px;overflow:hidden;box-shadow:0 24px 65px rgba(26,95,168,.17)}
.splash-inner h1{font-size:38px;margin:22px 0 5px;color:var(--ink-strong)}
.splash-inner p{color:#62809e;margin:0;letter-spacing:.08em;text-transform:uppercase;font-size:12px;font-weight:800}
.splash-line{width:220px;height:7px;border-radius:99px;background:#dfeefa;margin:30px auto 0;overflow:hidden}
.splash-line span{display:block;height:100%;width:38%;border-radius:99px;background:linear-gradient(90deg,var(--blue),var(--cyan),var(--orange));animation:plusLoad 1.1s ease-in-out infinite alternate}
.splash-orb{position:absolute;border-radius:50%;filter:blur(2px);opacity:.55}
.splash-a{width:360px;height:360px;background:rgba(19,184,239,.14);right:-140px;top:-130px}
.splash-b{width:330px;height:330px;background:rgba(255,138,31,.12);left:-120px;bottom:-120px}
@keyframes plusLoad{from{transform:translateX(-30%)}to{transform:translateX(190%)}}
@media(max-width:760px){
  .grid,.lesson-grid,.vocab-grid{grid-template-columns:1fr}
  .nav{align-items:flex-start;gap:12px}
  .nav-actions{justify-content:flex-end}
  .hero{padding-top:40px}
  .nav-actions .install-app-button{display:none}
  .auth-card .install-app-button{display:block}
  .brandmark{width:48px;height:48px;flex-basis:48px}
}