:root{--brand:#f59e0b;--brand-dark:#d97706;--teal:#0d9488;--teal-dark:#0f766e;--teal-soft:#ccfbf1;--ink:#1f2937;--ink-soft:#4b5563;--bg:#fff;--bg-soft:#f6f8fb;--line:#e5e7eb;--success:#087f5b;--danger:#c92a2a;--radius:14px;--shadow:0 10px 30px #1f293714;--maxw:1080px;--font:system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, sans-serif}*{box-sizing:border-box}[hidden]{display:none!important}html{-webkit-text-size-adjust:100%}body{font-family:var(--font);color:var(--ink);background:var(--bg);margin:0;line-height:1.65}a{color:var(--teal);text-decoration:none;transition:color .15s}a:hover{color:var(--teal-dark);text-decoration:underline}h1,h2,h3{margin:0 0 .5em;font-weight:700;line-height:1.2}h1{font-size:clamp(1.8rem,4vw,2.7rem)}.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}.notice-bar{background:var(--teal-dark);color:#fff;text-align:center;padding:7px 14px;font-size:.85rem}.notice-bar a{color:#fff;font-weight:700;text-decoration:underline}.notice-bar a:hover{text-decoration:none}header.site{background:var(--bg);border-bottom:1px solid var(--line);z-index:20;position:sticky;top:0;box-shadow:0 2px 10px #0f766e0f}header.site .container{justify-content:space-between;align-items:center;gap:16px;height:68px;display:flex}.brand{color:var(--ink);align-items:center;gap:8px;font-size:1.2rem;font-weight:800;display:inline-flex}.brand .fish{color:var(--brand)}.brand small{color:var(--ink-soft);font-weight:600}header.site .brand .fish{background:var(--teal-soft);width:34px;height:34px;color:var(--teal);border-radius:10px;justify-content:center;align-items:center;font-size:1.15rem;display:inline-flex}.brand-mark{object-fit:contain;border:1px solid var(--line);background:#fff;border-radius:10px;width:40px;height:40px}nav.site{align-items:center;gap:22px;display:flex}nav.site a.nav{color:var(--ink-soft);font-size:.95rem;font-weight:600}nav.site a.nav:hover{color:var(--teal-dark);text-decoration:none}header.site .cta{margin-left:4px;padding:10px 22px;font-size:.92rem}footer.site{background:linear-gradient(135deg, var(--teal) 0%, var(--teal-dark) 100%);color:#ffffffe0;margin-top:72px;padding:48px 0 0;font-size:.92rem}footer.site a{color:#ffffffeb;transition:color .15s}footer.site a:hover{color:#fff;text-decoration:none}footer.site h4{color:#fff;text-transform:uppercase;letter-spacing:.05em;margin:0 0 14px;font-size:.92rem;font-weight:700}footer.site .brand{color:#fff;margin-bottom:14px}footer.site .brand .fish{color:#fff}footer.site .brand .footer-mascot{object-fit:contain;filter:drop-shadow(0 6px 10px #0f766e99);border-radius:8px;flex:none;width:30px;height:30px}.footer-grid{grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;padding-bottom:36px;display:grid}.fcol{flex-direction:column;gap:10px;display:flex}.f-brand p{color:#ffffffd1;max-width:260px;margin:0 0 18px}.f-social{gap:10px;display:flex}.f-social a{background:#ffffff29;border-radius:999px;justify-content:center;align-items:center;width:36px;height:36px;display:inline-flex}.f-social a:hover{background:#ffffff4d}.footer-bottom{color:#ffffffbf;border-top:1px solid #fff3;padding:16px 0 22px;font-size:.85rem}.hero{background:linear-gradient(135deg, var(--teal) 0%, var(--teal-dark) 60%, #115e59 100%);color:#fff;text-align:center;border-radius:28px;margin-top:28px;padding:84px 44px;position:relative;overflow:hidden;box-shadow:0 24px 50px -24px #0d94888c}.hero h1{color:#fff;margin-bottom:.4em}.hero .eyebrow{color:#fff;background:#ffffff2e;border-radius:999px;margin-bottom:18px;padding:6px 14px;font-size:.85rem;font-weight:700;display:inline-block}.hero p.lead{color:#ffffffeb;max-width:620px;margin-left:auto;margin-right:auto;font-size:1.15rem}.hero .muted{color:#ffffffd9}.hero .btn.primary{box-shadow:0 12px 24px -12px #f59e0be6}.hero .btn.ghost:hover{color:#fff;background:#ffffff29}.hero .deco{opacity:.9;pointer-events:none;user-select:none;font-size:3rem;line-height:1;animation:5s ease-in-out infinite floaty;position:absolute}.hero .deco.d1{top:30px;left:34px}.hero .deco.d2{animation-delay:1.2s;top:24%;right:38px}.hero .deco.d3{animation-delay:2.4s;bottom:34px;left:24%}.hero .deco.d4{animation-delay:.6s;bottom:30px;right:24%}@keyframes floaty{0%,to{transform:translateY(0)rotate(-4deg)}50%{transform:translateY(-12px)rotate(4deg)}}.hero .mascot{object-fit:contain;filter:drop-shadow(0 22px 28px #0f766e8c);pointer-events:none;user-select:none;width:220px;height:220px;animation:5.5s ease-in-out infinite heroFloat;position:absolute;top:50%;right:44px}@keyframes heroFloat{0%,to{transform:translateY(-50%)translateY(-6px)}50%{transform:translateY(-50%)translateY(10px)}}.btn{background:var(--ink);color:#fff;cursor:pointer;border:none;border-radius:999px;padding:12px 26px;font-size:1rem;font-weight:700;text-decoration:none;transition:background .15s,transform 50ms;display:inline-block}.btn:hover{background:#111827;text-decoration:none}.btn.primary{background:var(--brand);color:#fff}.btn.ghost{color:var(--ink);border:1px solid var(--line);background:0 0}.btn-row{flex-wrap:wrap;gap:12px;margin-top:24px;display:flex}.grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px;margin-top:24px;display:grid}.card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}.card h3{margin-bottom:.4em}.card .emoji{font-size:1.8rem}.card p{color:var(--ink-soft);margin:0}.auth{border:1px solid var(--line);background:#fff;border-radius:22px;max-width:420px;margin:48px auto;padding:34px 34px 30px;position:relative;overflow:hidden;box-shadow:0 24px 60px -30px #0d948873}.auth:before{content:"";background:linear-gradient(90deg, var(--teal) 0%, var(--brand) 100%);height:8px;position:absolute;inset:0 0 auto}.auth .auth-mascot{text-align:center;flex-direction:column;align-items:center;margin:4px 0 18px;display:flex}.auth .auth-mascot img{object-fit:contain;background:linear-gradient(#e6f5f2,#d1ede8);border-radius:18px;width:76px;height:76px;padding:6px;box-shadow:0 12px 24px -14px #0d9488b3}.auth .auth-mascot .brand-word{color:var(--ink);letter-spacing:-.01em;margin-top:10px;font-size:1.2rem;font-weight:800}.auth .auth-mascot--illustrated img{object-fit:contain;object-position:center bottom;mix-blend-mode:multiply;background:#fffaf3;border-radius:16px;width:min(100%,250px);height:220px;padding:0;box-shadow:0 18px 34px #08383b1f}.auth .auth-mascot--illustrated .brand-word{margin-top:2px}.auth h1{text-align:center;margin:0 0 4px;font-size:1.4rem}.auth .auth-sub{text-align:center;color:var(--ink-soft);margin:0 0 22px;font-size:.95rem}.field{margin-bottom:18px}.field label{margin-bottom:6px;font-size:.9rem;font-weight:600;display:block}.field input{border:1px solid var(--line);border-radius:10px;width:100%;padding:12px 14px;font-family:inherit;font-size:1rem}.field .hint{color:var(--ink-soft);margin-top:4px;font-size:.82rem}.alert{border-radius:10px;margin-bottom:18px;padding:12px 14px;font-size:.92rem}.alert.error{color:var(--danger);background:#ffe3e3;border:1px solid #ffc9c9}.alert.success{color:var(--success);background:#d3f9d8;border:1px solid #b2f2bb}.auth .alt{color:var(--ink-soft);text-align:center;margin-top:20px;font-size:.92rem}.divider{color:var(--ink-soft);align-items:center;gap:12px;margin:20px 0;font-size:.85rem;display:flex}.divider:before,.divider:after{content:"";background:var(--line);flex:1;height:1px}.btn-google{width:100%;color:var(--ink);border:1px solid var(--line);cursor:pointer;background:#fff;border-radius:999px;justify-content:center;align-items:center;gap:10px;padding:12px 26px;font-size:1rem;font-weight:700;text-decoration:none;transition:background .15s,transform 50ms,box-shadow .15s;display:inline-flex}.btn-google:hover{background:var(--bg-soft);color:var(--ink);box-shadow:var(--shadow);text-decoration:none}.btn-google:active{transform:translateY(1px)}.btn-google .g-icon{flex:none;width:20px;height:20px}.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{flex-wrap:wrap;gap:12px;margin:20px 0 8px;display:flex}.dash-nav a.card-link{flex:200px}.dash-nav a.card-link:hover{border-color:var(--teal);text-decoration:none;transition:transform .12s;transform:translateY(-2px)}.study-subnav{flex-wrap:wrap;gap:10px;margin:16px 0 24px;display:flex}.study-subnav a.pill{border:1px solid var(--line);color:var(--ink-soft);background:var(--bg);border-radius:999px;padding:8px 16px;font-weight:600}.study-subnav a.pill:hover{background:var(--bg-soft);color:var(--ink);text-decoration:none}.study-subnav a.pill.on{background:var(--teal);color:#fff;border-color:var(--teal)}.study{width:min(1180px,100% - 48px);max-width:none;margin:0 auto;padding:40px 0 72px}.study .back{margin-bottom:8px;font-weight:600;display:inline-block}.study h1{font-size:clamp(1.6rem,3.5vw,2.2rem)}.barline{background:var(--teal);border-radius:999px;width:72px;height:6px;margin:14px 0 22px}.muted{color:var(--ink-soft)}.tiles{grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px;margin-top:8px;display:grid}.tile{border:1px solid var(--line);border-radius:var(--radius);background:var(--bg);box-shadow:var(--shadow);padding:18px;display:block}.tile:hover{border-color:var(--teal);text-decoration:none;transition:transform .12s;transform:translateY(-2px)}.tile .tt{font-size:1.05rem;font-weight:700}.tile .bb{color:var(--ink-soft);margin-top:4px;font-size:.9rem}.badge{color:#fff;border-radius:999px;padding:2px 10px;font-size:.78rem;font-weight:700;display:inline-block}.vsearch{border:1px solid var(--line);border-radius:12px;width:100%;margin:6px 0 18px;padding:13px 16px;font-family:inherit;font-size:1rem}.vsearch:focus{outline:2px solid var(--teal);border-color:#0000}.chips{flex-wrap:wrap;gap:8px;margin-bottom:18px;display:flex}.chip{border:1px solid var(--line);background:var(--bg);cursor:pointer;color:var(--ink-soft);border-radius:999px;padding:6px 14px;font-size:.85rem;font-weight:600}.chip.on{background:var(--teal);color:#fff;border-color:var(--teal)}.wlist{border:1px solid var(--line);border-radius:var(--radius);margin:0;padding:0;list-style:none;overflow:hidden}.wlist li{border-bottom:1px solid var(--line);cursor:pointer;justify-content:space-between;align-items:baseline;gap:10px;padding:12px 16px;display:flex}.wlist li:last-child{border-bottom:none}.wlist .wt{font-weight:700}.wlist .wtlvl{color:#fff;background:var(--teal-dark);border-radius:999px;padding:1px 8px;font-size:.78rem}.wlist .wtr{color:var(--ink-soft);font-size:.9rem}.wcount{color:var(--ink-soft);margin-bottom:10px;font-size:.85rem}.wdetail{border:1px solid var(--line);border-radius:var(--radius);background:var(--bg-soft);margin-bottom:18px;padding:22px;display:none;position:relative}.wdetail.show{animation:.15s fadein;display:block}@keyframes fadein{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}.wdetail h2{margin-bottom:2px;font-size:1.5rem}.wdetail .ipa{color:var(--ink-soft);font-family:ui-monospace,monospace}.wdetail .ex{border-left:3px solid var(--teal);color:var(--ink-soft);margin-top:10px;padding-left:12px;font-style:italic}.wdetail .tr{margin-top:10px;font-weight:600}.wdetail .close{background:var(--line);cursor:pointer;border:none;border-radius:999px;width:28px;height:28px;font-size:.9rem;position:absolute;top:12px;right:14px}.slide-box{border:1px solid var(--line);border-radius:var(--radius);background:var(--bg);box-shadow:var(--shadow);padding:24px}.slide-box h3{margin-top:0}.slide-box .body{white-space:pre-line;color:var(--ink);font-size:1.02rem}.slidebox-nav{align-items:center;gap:12px;margin-top:18px;display:flex}.quiz-q{border:1px solid var(--line);border-radius:var(--radius);background:var(--bg-soft);margin:16px 0;padding:16px}.quiz-q .qq{margin-bottom:10px;font-weight:700}.option{text-align:left;border:1px solid var(--line);background:var(--bg);cursor:pointer;border-radius:10px;width:100%;margin:6px 0;padding:10px 14px;font-family:inherit;font-size:.98rem;display:block}.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{margin:8px 0;font-weight:700}.reveal{color:var(--ink-soft);margin-top:6px;font-size:.92rem}.passage{border:1px solid var(--line);border-radius:var(--radius);background:var(--bg);box-shadow:var(--shadow);white-space:pre-wrap;padding:24px;font-size:1.05rem;line-height:1.9}.empty{color:var(--ink-soft);padding:20px 0}.section-head{text-align:center;max-width:620px;margin:0 auto 30px}.kicker,.section-head .kicker{color:var(--teal);letter-spacing:.06em;text-transform:uppercase;margin-bottom:8px;font-size:.82rem;font-weight:800;display:inline-block}.section-head h2{margin:0 0 8px}.section-head p{color:var(--ink-soft);margin:0}.feat-grid{grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:22px;display:grid}.feat{background:var(--bg);border:1px solid var(--line);border-radius:22px;padding:28px 24px;transition:transform .18s,box-shadow .18s;box-shadow:0 14px 34px -18px #1f293738}.feat:hover{transform:translateY(-6px);box-shadow:0 22px 44px -20px #0d948859}.feat-emoji{background:var(--teal-soft);border-radius:18px;justify-content:center;align-items:center;width:58px;height:58px;margin-bottom:14px;font-size:1.7rem;display:inline-flex}.feat h3{margin-bottom:.4em}.feat p{color:var(--ink-soft);margin:0;font-size:.95rem}.split-wrap{background:var(--bg-soft);border-radius:28px;margin-top:40px;padding:56px 0}.split{grid-template-columns:1fr 1.1fr;align-items:center;gap:44px;display:grid}.split__panel{background:linear-gradient(135deg, var(--teal-soft) 0%, #e6fffa 100%);text-align:center;color:var(--teal-dark);border-radius:24px;flex-direction:column;justify-content:center;align-items:center;gap:10px;min-height:280px;padding:40px 34px;display:flex}.split__panel .big{flex-wrap:wrap;justify-content:center;gap:16px;font-size:3.4rem;display:flex}.split__panel p{margin:0;font-size:1.05rem;font-weight:700}.split__body .kicker{margin-bottom:6px}.split__body h2{margin:0 0 10px}.split__body ul{gap:14px;margin:8px 0 0;padding:0;list-style:none;display:grid}.split__body li{color:var(--ink-soft);padding-left:30px;position:relative}.split__body li:before{content:"✔";color:var(--teal);font-weight:800;position:absolute;top:0;left:0}.split__body .btn-row{margin-top:26px}.study.teacher{max-width:1080px}.tstat{grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:16px;margin-top:8px;display:grid}.tstat__card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}.tstat__num{color:var(--teal-dark);font-size:2rem;font-weight:800}.tstat__label{color:var(--ink-soft);font-size:.9rem}.wrap-table{-webkit-overflow-scrolling:touch;scrollbar-width:thin;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg);box-shadow:var(--shadow);overflow-x:auto}.teacher-next-action{color:var(--ink-soft);max-width:34rem;margin-top:6px;font-size:.82rem;line-height:1.4}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.tbl{border-collapse:collapse;width:100%;font-size:.95rem}.tbl th,.tbl td{text-align:left;border-bottom:1px solid var(--line);vertical-align:top;padding:12px 16px}.tbl th{background:var(--teal-soft);color:var(--ink-soft);font-size:.85rem;font-weight:700}.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{flex-wrap:wrap;gap:8px;display:flex}.mod{background:var(--bg-soft);border:1px solid var(--line);opacity:.55;border-radius:10px;flex-direction:column;align-items:center;padding:6px 10px;font-size:1rem;line-height:1.1;display:inline-flex}.mod.on{opacity:1;border-color:var(--teal);background:var(--teal-soft)}.mod small{color:var(--ink);font-size:.72rem;font-weight:700}.class-form{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.class-form input{border:1px solid var(--line);border-radius:10px;flex:260px;padding:12px 14px;font-family:inherit;font-size:1rem}.class-form input:focus{outline:2px solid var(--teal);border-color:#0000}.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{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}.class-card__code{color:var(--ink-soft);margin:10px 0;font-size:.95rem}.jcode{background:var(--teal-soft);border:1px solid var(--teal);color:var(--teal-dark);letter-spacing:.12em;border-radius:8px;padding:4px 12px;font-weight:800}.class-card__members{flex-wrap:wrap;gap:8px;display:flex}.mem{background:var(--bg-soft);border:1px solid var(--line);border-radius:999px;padding:4px 12px;font-size:.85rem;font-weight:600}.contact{flex-direction:column;gap:14px;margin-top:16px;display:flex}.contact__row{align-items:flex-start;gap:12px;display:flex}.contact__icon{font-size:1.4rem;line-height:1.2}.email{color:var(--teal-dark);word-break:break-all;font-weight:600}@media (width<=900px){.hero .mascot{display:none}.split{grid-template-columns:1fr}.footer-grid{grid-template-columns:2fr 1fr}}@media (width<=860px){header.site .container{align-items:flex-start;height:auto;min-height:64px;padding-top:10px;padding-bottom:10px}nav.site{scrollbar-width:thin;max-width:100%;padding-bottom:6px;overflow-x:auto}nav.site a.nav{white-space:nowrap}}@media (width<=720px){.hero{border-radius:22px;padding:60px 22px}nav.site{gap:12px}.hero .deco{font-size:2rem}.footer-grid{grid-template-columns:1fr 1fr}}.btn{transition:background .16s,transform 90ms,box-shadow .16s,border-color .16s}.btn:active{transform:translateY(1px)scale(.985)}.btn.primary{box-shadow:0 8px 18px -12px #f59e0bbf}.btn.primary:hover{transform:translateY(-1px);box-shadow:0 12px 22px -12px #f59e0bf2}.btn.ghost:hover{transform:translateY(-1px)}.card,.card-link,.tile,.tstat__card{transition:transform .18s,box-shadow .18s,border-color .18s}.card:hover,.card-link:hover,.tile:hover,.tstat__card:hover{border-color:var(--teal);transform:translateY(-3px);box-shadow:0 16px 34px -16px #0d948859}.feat-card:hover{transform:translateY(-5px);box-shadow:0 20px 40px -18px #0d94886b}.feat-card{flex-direction:column;align-items:flex-start;gap:6px;display:flex}.feat-card .start-pill{margin-top:12px}.excite{margin:22px 0 0}.stat-grid{flex-wrap:wrap;gap:14px;margin-top:4px;display:flex}.stat-chip{background:linear-gradient(135deg, var(--teal-soft) 0%, #e6fffa 100%);border:1px solid var(--teal-soft);border-radius:var(--radius);align-items:center;gap:10px;padding:12px 18px;display:inline-flex;box-shadow:0 10px 22px -16px #0d948880}.stat-chip .stat-ico{font-size:1.5rem;line-height:1}.stat-chip 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