:root{--teal:#073f40;--teal2:#0a5754;--teal3:#0e716b;--gold:#d8b15b;--gold2:#f0d28a;--cream:#f6f2e9;--paper:#f7faf8;--white:#fff;--ink:#173b3b;--muted:#6b807f;--line:#dfe8e4;--ok:#1d8a67;--danger:#a66152;--shadow:0 18px 55px rgba(5,55,53,.12)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Arial,Tahoma,sans-serif;background:var(--paper);color:var(--ink);line-height:1.7}a{text-decoration:none;color:inherit}button,input{font:inherit}.container{width:min(1180px,92%);margin:auto}
.topbar{position:sticky;top:0;z-index:50;background:rgba(5,52,53,.96);backdrop-filter:blur(14px);border-bottom:1px solid rgba(255,255,255,.08)}.nav{height:74px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:12px;color:white}.brand img{width:46px;height:46px;border-radius:13px;object-fit:cover;box-shadow:0 8px 24px rgba(0,0,0,.2)}.brand strong{display:block;font-size:16px}.brand small{display:block;opacity:.66;direction:ltr}.navlinks{display:flex;gap:24px;color:#d8e8e4;font-size:14px}.nav-actions{display:flex;gap:10px;align-items:center}.avatar{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;background:#ffffff16;color:#fff;border:1px solid #ffffff22}.pill{display:inline-flex;align-items:center;gap:7px;padding:8px 12px;border-radius:999px;font-size:12px;font-weight:700}.pill-gold{background:#d8b15b1a;color:#8f6e24;border:1px solid #d8b15b55}.pill-light{background:#ffffff15;color:white;border:1px solid #ffffff22}.pill-ok{background:#e2f4ed;color:#16674f}.pill-lock{background:#f5ede0;color:#8a6a2b}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;padding:12px 20px;border-radius:12px;font-weight:700;cursor:pointer}.btn-gold{background:var(--gold);color:#183b39}.btn-teal{background:var(--teal);color:#fff}.btn-soft{background:#e7f1ee;color:var(--teal)}.btn-outline{border:1px solid var(--line);background:#fff;color:var(--ink)}
.student-hero{background:radial-gradient(circle at 8% 0,#1a77724a,transparent 35%),linear-gradient(135deg,#043334,#07504f);color:white;padding:48px 0 42px}.student-hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:45px;align-items:center}.eyebrow{display:inline-flex;align-items:center;gap:9px;color:var(--gold2);font-weight:700;font-size:13px}.eyebrow:before{content:"";width:24px;height:2px;background:var(--gold)}h1{font-size:42px;line-height:1.25;margin:12px 0 14px}.lead{color:#d7e5e1;font-size:17px;max-width:700px;margin:0}.hero-stat{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:28px}.hero-stat>div{background:#ffffff0e;border:1px solid #ffffff17;border-radius:14px;padding:15px}.hero-stat strong{font-size:22px;color:#fff}.hero-stat small{display:block;color:#bcd0cc}.progress-card{background:#fff;color:var(--ink);border-radius:24px;padding:22px;box-shadow:0 30px 75px rgba(0,20,20,.35)}.progress-top{display:flex;justify-content:space-between;align-items:center}.progress-track{height:9px;background:#e8efed;border-radius:9px;overflow:hidden;margin:18px 0 8px}.progress-track span{display:block;height:100%;width:25%;background:linear-gradient(90deg,var(--teal3),var(--gold));border-radius:9px}.progress-card small{color:var(--muted)}
.main{padding:38px 0 80px}.layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:26px}.section-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:24px;box-shadow:0 10px 35px rgba(4,53,51,.06)}.section-head{display:flex;justify-content:space-between;gap:20px;align-items:flex-start;margin-bottom:20px}.section-head h2,.section-head h3{margin:0}.section-head p{margin:4px 0 0;color:var(--muted);font-size:14px}
.schedule{display:grid;gap:12px}.period{display:grid;grid-template-columns:70px 56px minmax(0,1fr) auto;gap:15px;align-items:center;border:1px solid #e7eeeb;border-radius:17px;padding:14px;background:#fff;transition:.2s}.period:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(4,53,51,.08)}.period.current{border-color:#d8b15b88;background:linear-gradient(90deg,#fff,#fffcf4)}.period-time{font-weight:bold;font-size:13px;color:#708583}.subject-icon{width:52px;height:52px;border-radius:15px;display:grid;place-items:center;background:#e6f2ef;color:var(--teal);font-size:19px;font-weight:700}.period h3{font-size:16px;margin:0}.period p{font-size:13px;color:var(--muted);margin:2px 0 0}.period-action{min-width:110px}.preparing{opacity:.72}.preparing .subject-icon{background:#eff2f1;color:#7b8d89}
.side-stack{display:grid;gap:18px}.side-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:20px}.side-card h3{margin:0 0 14px;font-size:17px}.mini-row{display:flex;justify-content:space-between;gap:15px;padding:11px 0;border-bottom:1px dashed #e5ece9;font-size:13px}.mini-row:last-child{border:0}.mini-row span{color:var(--muted)}.upgrade{background:linear-gradient(145deg,#073f40,#0c5c58);color:#fff;border:0}.upgrade p{color:#c9dbd7;font-size:14px}.sand-box{background:#f1f7f5;border-radius:15px;padding:15px}.sand-title{display:flex;align-items:center;gap:10px}.sand-mark{width:36px;height:36px;border-radius:11px;background:var(--teal);color:var(--gold2);display:grid;place-items:center;font-weight:bold}
.breadcrumb{font-size:13px;color:var(--muted);margin:22px 0}.lesson-hero{display:grid;grid-template-columns:1.1fr .9fr;gap:28px;align-items:center}.lesson-cover{border-radius:22px;overflow:hidden;background:#062f30;box-shadow:var(--shadow)}.lesson-cover img{width:100%;display:block;aspect-ratio:16/9;object-fit:cover}.lesson-meta{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}.lesson-title{font-size:38px;line-height:1.25;margin:8px 0 14px}.lesson-copy{color:var(--muted)}.video-cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}.youtube{background:#c9332e;color:#fff}.content-grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:24px;margin-top:28px}.content-section{background:#fff;border:1px solid var(--line);border-radius:20px;padding:24px;margin-bottom:17px}.content-section h2{font-size:21px;margin:0 0 15px}.objectives{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.objective{padding:13px;border-radius:13px;background:#f1f7f5;font-size:14px}.keypoints{padding-right:20px}.keypoints li{margin:9px 0}.quiz-q{border:1px solid #e5ece9;border-radius:15px;padding:16px;margin:12px 0}.quiz-q b{display:block;margin-bottom:10px}.answers{display:grid;gap:7px}.answer{display:flex;gap:8px;align-items:center;background:#f8faf9;border:1px solid #e5ece9;border-radius:10px;padding:9px 11px;cursor:pointer}.quiz-result{display:none;margin-top:14px;padding:12px;border-radius:12px;background:#e6f3ed;color:#17684f;font-weight:bold}.locked-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.locked-item{border:1px solid #eadfc7;background:#fffaf0;border-radius:14px;padding:15px}.locked-item b{display:block}.locked-item small{color:#89795d}.live-item{background:linear-gradient(140deg,#083f40,#0c5e59);color:#fff;border-radius:17px;padding:18px}.live-item p{color:#caddd8;font-size:14px}.sticky{position:sticky;top:94px}.lesson-nav a{display:flex;justify-content:space-between;padding:11px 0;border-bottom:1px dashed #e2ebe7;font-size:14px}.lesson-nav a:last-child{border:0}.lesson-nav span{color:var(--muted)}
.footer{background:#032e2f;color:#c7d7d3;padding:34px 0}.footer-row{display:flex;justify-content:space-between;gap:20px;align-items:center;font-size:13px}
@media(max-width:900px){.navlinks{display:none}.student-hero-grid,.layout,.lesson-hero,.content-grid{grid-template-columns:1fr}.progress-card{max-width:520px}.sticky{position:static}.hero-stat{grid-template-columns:repeat(3,1fr)}.lesson-title{font-size:32px}}@media(max-width:620px){.brand small{display:none}.nav-actions .pill-light{display:none}.student-hero{padding-top:34px}h1{font-size:31px}.hero-stat{grid-template-columns:1fr}.period{grid-template-columns:50px 48px 1fr}.period-action{grid-column:2/4}.period-action .btn{width:100%}.objectives,.locked-grid{grid-template-columns:1fr}.footer-row{display:block}.lesson-title{font-size:29px}}