:root{--brand: #f59e0b;--brand-dark: #d97706;--ink: #1f2937;--ink-soft: #4b5563;--bg: #ffffff;--bg-soft: #f6f8fb;--line: #e5e7eb;--success: #087f5b;--danger: #c92a2a;--radius: 14px;--shadow: 0 10px 30px rgba(31, 41, 55, .08);--maxw: 1080px;--font: system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, sans-serif}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.65}a{color:var(--brand-dark);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3{line-height:1.2;margin:0 0 .5em;font-weight:700}h1{font-size:clamp(1.8rem,4vw,2.7rem)}h2{font-size:clamp(1.35rem,3vw,1.8rem)}.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}header.site{background:var(--bg);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}header.site .container{display:flex;align-items:center;justify-content:space-between;gap:16px;height:64px}.brand{font-weight:800;font-size:1.2rem;color:var(--ink);display:inline-flex;align-items:center;gap:8px}.brand .fish{color:var(--brand)}.brand small{font-weight:600;color:var(--ink-soft)}nav.site{display:flex;align-items:center;gap:18px}nav.site a.nav{color:var(--ink-soft);font-weight:600;font-size:.95rem}nav.site a.nav:hover{color:var(--ink);text-decoration:none}footer.site{border-top:1px solid var(--line);background:var(--bg-soft);padding:28px 0;margin-top:64px;color:var(--ink-soft);font-size:.9rem}footer.site .container{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between}.hero{padding:56px 0 48px}.hero .eyebrow{display:inline-block;background:#fef3c7;color:var(--brand-dark);font-weight:700;font-size:.85rem;padding:4px 12px;border-radius:999px;margin-bottom:16px}.hero p.lead{font-size:1.15rem;color:var(--ink-soft);max-width:640px}.btn{display:inline-block;background:var(--ink);color:#fff;border:none;border-radius:999px;padding:12px 26px;font-weight:700;font-size:1rem;cursor:pointer;text-decoration:none;transition:background .15s,transform .05s}.btn:hover{background:#111827;text-decoration:none}.btn:active{transform:translateY(1px)}.btn.primary{background:var(--brand);color:#fff}.btn.primary:hover{background:var(--brand-dark)}.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}.btn.ghost:hover{background:var(--bg-soft)}.btn-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.section{padding:40px 0}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px;margin-top:24px}.card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}.card h3{margin-bottom:.4em}.card .emoji{font-size:1.8rem}.card p{color:var(--ink-soft);margin:0}.auth{max-width:420px;margin:48px auto;background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:32px}.auth h1{font-size:1.5rem}.field{margin-bottom:18px}.field label{display:block;font-weight:600;font-size:.9rem;margin-bottom:6px}.field input{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;font-size:1rem;font-family:inherit}.field input:focus{outline:2px solid var(--brand);border-color:transparent}.field .hint{font-size:.82rem;color:var(--ink-soft);margin-top:4px}.alert{border-radius:10px;padding:12px 14px;font-size:.92rem;margin-bottom:18px}.alert.error{background:#ffe3e3;color:var(--danger);border:1px solid #ffc9c9}.alert.success{background:#d3f9d8;color:var(--success);border:1px solid #b2f2bb}.auth .alt{margin-top:20px;font-size:.92rem;color:var(--ink-soft);text-align:center}.dash{max-width:720px;margin:40px auto}.dash .panel{border:1px solid var(--line);border-radius:var(--radius);background:var(--bg-soft);padding:24px}.dash .email{font-weight:600}.dash ul{padding-left:20px}.dash li{margin:6px 0}.dash-nav{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0 8px}.dash-nav a.card-link{flex:1 1 200px}.dash-nav a.card-link:hover{text-decoration:none;transform:translateY(-2px);transition:transform .12s}.study-subnav{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0 24px}.study-subnav a.pill{border:1px solid var(--line);border-radius:999px;padding:8px 16px;font-weight:600;color:var(--ink-soft);background:var(--bg)}.study-subnav a.pill:hover{background:var(--bg-soft);text-decoration:none;color:var(--ink)}.study-subnav a.pill.on{background:var(--brand);color:#fff;border-color:var(--brand)}.study{max-width:860px;margin:40px auto}.study .back{display:inline-block;font-weight:600;margin-bottom:8px}.study h1{font-size:clamp(1.6rem,3.5vw,2.2rem)}.barline{height:6px;width:72px;border-radius:999px;background:var(--brand);margin:14px 0 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0;padding:16px;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg-soft)}.quiz-q .qq{font-weight:700;margin-bottom:10px}.option{display:block;width:100%;text-align:left;border:1px solid var(--line);background:var(--bg);border-radius:10px;padding:10px 14px;margin:6px 0;cursor:pointer;font-family:inherit;font-size:.98rem}.option:hover:not(:disabled){background:var(--bg-soft)}.option.correct{background:#d3f9d8;border-color:#69db7c;font-weight:700}.option.wrong{background:#ffe3e3;border-color:#ffa8a8}.option:disabled{cursor:default;opacity:.85}.score-line{font-weight:700;margin:8px 0}.reveal{margin-top:6px;font-size:.92rem;color:var(--ink-soft)}.passage{border:1px solid var(--line);border-radius:var(--radius);background:var(--bg);box-shadow:var(--shadow);padding:24px;line-height:1.9;font-size:1.05rem;white-space:pre-wrap}.empty{color:var(--ink-soft);padding:20px 0}.footer-cols{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center;width:100%}footer.site .footer-cols>div:first-child{display:flex;flex-direction:column;gap:2px}.footer-nav{flex-wrap:wrap}.study.teacher{max-width:1080px}.tstat{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:16px;margin-top:8px}.tstat__card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}.tstat__num{font-size:2rem;font-weight:800;color:var(--brand-dark)}.tstat__label{color:var(--ink-soft);font-size:.9rem}.wrap-table{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg);box-shadow:var(--shadow)}.tbl{width:100%;border-collapse:collapse;font-size:.95rem}.tbl th,.tbl td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line);vertical-align:top}.tbl th{background:var(--bg-soft);font-weight:700;color:var(--ink-soft);font-size:.85rem}.tbl tbody tr:last-child td{border-bottom:none}.tbl tbody tr:hover td{background:var(--bg-soft)}.btn-link{font-weight:600}.small{font-size:.82rem}.mods{display:flex;gap:8px;flex-wrap:wrap}.mod{display:inline-flex;flex-direction:column;align-items:center;background:var(--bg-soft);border:1px solid var(--line);border-radius:10px;padding:6px 10px;font-size:1rem;line-height:1.1;opacity:.55}.mod.on{opacity:1;border-color:var(--brand);background:#fef3c7}.mod small{font-size:.72rem;font-weight:700;color:var(--ink)}.class-form{display:flex;gap:12px;flex-wrap:wrap;align-items:center}.class-form input{flex:1 1 260px;padding:12px 14px;border:1px solid var(--line);border-radius:10px;font-size:1rem;font-family:inherit}.class-form input:focus{outline:2px solid var(--brand);border-color:transparent}.class-msg{margin:12px 0 0;font-size:.92rem;font-weight:600}.class-msg.ok{color:var(--success)}.class-msg.err{color:var(--danger)}.class-card{margin-bottom:16px}.class-card__head{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.class-card__code{margin:10px 0;color:var(--ink-soft);font-size:.95rem}.jcode{background:#fef3c7;border:1px solid var(--brand);color:var(--brand-dark);font-weight:800;padding:4px 12px;border-radius:8px;letter-spacing:.12em}.class-card__members{display:flex;flex-wrap:wrap;gap:8px}.mem{background:var(--bg-soft);border:1px solid var(--line);border-radius:999px;padding:4px 12px;font-size:.85rem;font-weight:600}.contact{display:flex;flex-direction:column;gap:14px;margin-top:16px}.contact__row{display:flex;align-items:flex-start;gap:12px}.contact__icon{font-size:1.4rem;line-height:1.2}.email{color:var(--brand-dark);font-weight:600;word-break:break-all}@media(max-width:720px){.hero{padding:40px 0}nav.site{gap:12px}}