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10px;font-weight:700;cursor:pointer}.login-role-tabs button.active.teacher{border-color:#1e3a5f;background:#1e3a5f14}.login-role-tabs button.active.student{border-color:#76ba43;background:#76ba4326}.login-form{display:grid;gap:14px}.login-form label{display:grid;gap:6px}.login-form label span{font-size:12px;font-weight:700;color:#1e3a5f9e}.login-form input{width:100%;border:1px solid rgba(118,186,67,.28);background:#fff;color:#1e3a5f;border-radius:12px;padding:10px 12px;font-size:14px}.login-submit{margin-top:4px;border:none;background:#76ba43;color:#fff;border-radius:999px;padding:12px;font-weight:800;cursor:pointer}.login-submit:disabled{opacity:.6;cursor:not-allowed}.login-error{margin:0;color:#dc2626;font-size:12px}.login-footer{margin-top:14px;text-align:center}.login-mode-toggle{border:none;background:transparent;color:#0d9488;cursor:pointer;font-size:12px;font-weight:700}.login-hint{margin:14px 0 0;font-size:11px;color:#1e3a5f8c;text-align:center;line-height:1.5}.student-friends-panel{position:relative;display:inline-flex}.student-friends-toggle{display:inline-flex;align-items:center;gap:6px;padding:8px 12px;border-radius:var(--app-radius);border:1px solid #f5c6a5;background:linear-gradient(180deg,#fff7ed,#ffedd5);color:#9a3412;font-size:12px;font-weight:700;cursor:pointer}.student-friends-dropdown{position:absolute;top:calc(100% + 8px);right:0;z-index:100030;width:min(340px,calc(100vw - 24px));max-height:min(60vh,460px);overflow:auto;border-radius:var(--app-radius);border:1px solid #f5c6a5;background:#fff;box-shadow:0 16px 40px #9a341226;padding:12px}.student-friends-header{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:10px}.student-friends-actions{display:flex;gap:6px}.student-friends-me{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:10px 12px;margin-bottom:10px;border-radius:var(--app-radius);background:#fff7ed;border:1px solid #fed7aa;font-size:12px}.student-friends-me strong{color:#c2410c;font-size:16px}.student-friends-list{list-style:none;margin:0;padding:0;display:grid;gap:8px}.student-friends-list li{padding:10px 12px;border-radius:var(--app-radius);border:1px solid #fde68a;background:#fffbeb}.student-friends-list li.is-me{border-color:#fb923c;background:#ffedd5}.student-friends-row-top{display:flex;align-items:center;gap:8px;margin-bottom:4px}.student-friends-rank{font-weight:800;color:#c2410c;min-width:28px}.student-friends-name{flex:1;font-weight:700;color:#7c2d12}.student-friends-row-meta{display:flex;flex-wrap:wrap;gap:8px;font-size:11px;color:#9a3412}.student-friends-muted{margin:0;font-size:12px;color:#a16207}.student-friends-error{margin:0;font-size:12px;color:#b91c1c}.teacher-random-drag-bar{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:8px;padding:8px 10px;background:linear-gradient(180deg,#f1f5f9,#e2e8f0);border-bottom:1px solid #cbd5e1;-webkit-user-select:none;user-select:none}.teacher-random-drag-handle{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:var(--app-radius);cursor:grab;touch-action:none;color:#64748b}.teacher-random-drag-handle:active{cursor:grabbing}.teacher-random-drag-bar span{color:#334155;font-size:12px;font-weight:800}.teacher-random-close{width:34px;height:34px;min-height:34px;position:relative;z-index:2;pointer-events:auto;cursor:pointer}.teacher-random-body{overflow:auto;padding:14px 16px 16px;display:grid;gap:12px}.teacher-random-overlay{display:none}.teacher-random-modal{width:min(680px,calc(100vw - 24px));max-height:min(86vh,820px);overflow:auto;border-radius:var(--app-radius);border:1px solid #cbd5e1;background:#fff;box-shadow:0 24px 60px #0f172a40;padding:18px;display:grid;gap:14px}.teacher-random-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.teacher-random-head strong{display:block;font-size:18px;color:#111827}.teacher-random-question{margin:0;color:#111827;font-size:18px;line-height:1.55;font-weight:800}.teacher-random-options{display:grid;gap:8px}.teacher-random-option{display:grid;grid-template-columns:28px minmax(0,1fr);gap:10px;align-items:center;text-align:left;border:1px solid #dbe1ea;border-radius:var(--app-radius);background:#f8fafc;padding:10px 12px}.teacher-random-option.selected{border-color:#334155;background:#e2e8f0}.teacher-random-option.correct{border-color:#16a34a;background:#f0fdf4}.teacher-random-option.wrong{border-color:#dc2626;background:#fff5f5}.teacher-random-option span{width:28px;height:28px;border-radius:50%;background:#e2e8f0;color:#334155;display:inline-flex;align-items:center;justify-content:center;font-size:12px;font-weight:900}.teacher-random-result{border-radius:var(--app-radius);padding:12px;display:grid;gap:6px}.teacher-random-result.correct{border:1px solid #bbf7d0;background:#f0fdf4}.teacher-random-result.wrong{border:1px solid #fecaca;background:#fff5f5}.teacher-random-result p{margin:0;color:#475569;font-size:13px;line-height:1.45}.teacher-random-actions{display:flex;justify-content:space-between;gap:10px}.teacher-random-reveal{background:#1e293b!important;color:#fff!important;border-color:#334155!important}.study-mascot-wrap{position:fixed;z-index:100015;display:grid;gap:8px;justify-items:center;touch-action:none}.study-mascot-bubble{max-width:220px;border-radius:18px;background:#fffffff5;border:1px solid rgba(30,58,95,.1);box-shadow:0 12px 28px #1e3a5f1a;padding:10px 12px;color:#1e3a5f;font-size:12px;font-weight:650;line-height:1.45}.study-mascot-body{border:none;background:transparent;padding:0;cursor:grab;display:grid;justify-items:center;gap:4px}.study-mascot-body:active{cursor:grabbing}.study-mascot-svg{width:96px;height:96px;filter:drop-shadow(0 10px 16px rgba(244,114,182,.35));animation:mascot-bob 2.8s ease-in-out infinite}.study-mascot-img{width:108px;height:108px;object-fit:contain;background:transparent;filter:drop-shadow(0 12px 18px rgba(30,58,95,.18));animation:mascot-bob 2.8s ease-in-out infinite;pointer-events:none;-webkit-user-select:none;user-select:none}.study-mascot-name{font-size:11px;font-weight:800;color:#1e3a5f;background:#ffffffeb;border:1px solid rgba(118,186,67,.28);border-radius:var(--app-radius-pill);padding:2px 10px;cursor:pointer}.study-mascot-name:hover{background:#f3f8ef;border-color:#76ba43}.study-mascot-name-edit{width:100%;max-width:120px}.study-mascot-name-input{width:100%;border:1px solid #f472b6;border-radius:var(--app-radius-pill);padding:3px 8px;font-size:11px;font-weight:800;color:#831843;text-align:center;background:#fff;outline:none;box-shadow:0 0 0 2px #f472b62e}.task-mascot-name-row{display:grid;gap:8px;padding:12px 14px;border:1px solid #e2e8f0;border-radius:var(--app-radius);background:#fff7fbd9}.task-mascot-name-row label{font-size:12px;font-weight:800;color:#831843}.task-mascot-name-controls{display:flex;gap:8px;align-items:center}.task-mascot-name-input{flex:1;min-width:0;border:1px solid #fbcfe8;border-radius:var(--app-radius);padding:8px 10px;font-size:13px;font-weight:700;color:#1f2937;background:#fff}.task-mascot-name-input:focus{outline:none;border-color:#f472b6;box-shadow:0 0 0 2px #f472b62e}.task-mascot-name-reset{border:1px solid #fbcfe8;background:#fff;color:#db2777;border-radius:var(--app-radius);padding:8px 10px;font-size:12px;font-weight:700;white-space:nowrap;cursor:pointer}.task-mascot-name-reset:hover{background:#fff1f8}@keyframes mascot-bob{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}.entry-gate{--gc-blue: #4285F4;--gc-red: #EA4335;--gc-yellow: #FBBC05;--gc-green: #34A853;--gc-ink: #202124;--gc-muted: #5f6368;--gc-line: rgba(60, 64, 67, .12);--entry-wood: url(/covers/wood-cartoon-texture.jpg);box-sizing:border-box;width:100%;min-height:100vh;min-height:100dvh;display:flex;flex-direction:column;padding:0;margin:0;background-color:#fff6e8;background-image:linear-gradient(180deg,#ffffff9e,#fffcf57a),var(--entry-wood);background-size:auto,420px 420px;background-repeat:no-repeat,repeat;background-position:center,center;color:var(--gc-ink);overflow-y:auto}.entry-gate-shell{box-sizing:border-box;width:100%;min-height:100vh;min-height:100dvh;max-width:none;border-radius:0;border:none;background:transparent;box-shadow:none;padding:0 0 28px;display:grid;grid-template-columns:minmax(0,1fr);gap:22px;align-content:start}.entry-gate-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px clamp(20px,4vw,48px);border-bottom:1px solid rgba(120,68,16,.12);background:#fff8ece0;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}.entry-gate-brand{display:flex;align-items:center;gap:10px;min-width:0}.entry-gate-menu{width:40px;height:40px;border:none;border-radius:999px;background:transparent;display:grid;place-content:center;gap:4px;cursor:default;padding:0}.entry-gate-menu span{display:block;width:16px;height:1.6px;border-radius:999px;background:var(--gc-muted)}.entry-gate-menu{cursor:pointer;transition:background .18s ease}.entry-gate-menu:hover,.entry-gate-menu:focus-visible{background:#3c404314;outline:none}.entry-gate-menu:active{background:#3c404329}.entry-sider-root{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1200}.entry-scrim{position:absolute;top:0;right:0;bottom:0;left:0;border:none;padding:0;background:#2021246b;cursor:pointer;animation:entry-scrim-in .22s ease both}@keyframes entry-scrim-in{0%{opacity:0}to{opacity:1}}.entry-sider{position:absolute;top:0;left:0;bottom:0;width:min(320px,86vw);display:flex;flex-direction:column;background:#fff;border-radius:0 20px 20px 0;box-shadow:0 12px 40px #20212447;animation:entry-sider-in .26s cubic-bezier(.22,1,.36,1) both;overflow-y:auto}@keyframes entry-sider-in{0%{transform:translate(-100%)}to{transform:translate(0)}}.entry-sider-head{display:flex;align-items:center;gap:10px;padding:16px 14px 14px 18px;border-bottom:1px solid var(--gc-line)}.entry-sider-logo{width:36px;height:36px;flex:0 0 auto}.entry-sider-logo svg{width:100%;height:100%;display:block}.entry-sider-head-text{display:grid;gap:1px;min-width:0;flex:1}.entry-sider-head-text strong{font-size:15px;font-weight:800;letter-spacing:-.02em;color:var(--gc-ink);line-height:1.1}.entry-sider-head-text span{font-size:12px;font-weight:600;color:var(--gc-muted)}.entry-sider-close{width:36px;height:36px;flex:0 0 auto;border:none;border-radius:999px;background:transparent;color:var(--gc-muted);display:grid;place-content:center;cursor:pointer;transition:background .18s ease,color .18s ease}.entry-sider-close:hover,.entry-sider-close:focus-visible{background:#3c404314;color:var(--gc-ink);outline:none}.entry-sider-section-title{margin:0;padding:0 18px;font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--gc-muted)}.entry-sider-nav{display:grid;gap:4px;padding:16px 0 6px}.entry-sider-nav .entry-sider-section-title{margin-bottom:6px}.entry-sider-item{display:flex;align-items:center;gap:12px;width:calc(100% - 20px);margin:0 10px;padding:9px 10px;border:none;border-radius:14px;background:transparent;color:var(--gc-ink);text-align:left;cursor:pointer;transition:background .16s ease}.entry-sider-item:hover,.entry-sider-item:focus-visible{background:#f1f3f4;outline:none}.entry-sider-item.is-active{background:#e8f0fe}.entry-sider-item-icon{width:34px;height:34px;flex:0 0 auto;border-radius:12px;display:grid;place-content:center;background:#f1f3f4;color:var(--gc-muted)}.entry-sider-item-icon.tone-home{background:#feefc3;color:#b06000}.entry-sider-item-icon.tone-lang{background:#e6f4ea;color:#137333}.entry-sider-item-text{display:grid;gap:1px;min-width:0;flex:1}.entry-sider-item-text strong{font-size:13.5px;font-weight:750;line-height:1.25}.entry-sider-item-text small{font-size:11.5px;font-weight:600;color:var(--gc-muted)}.entry-sider-item-dot{width:8px;height:8px;border-radius:999px;background:var(--gc-blue);flex:0 0 auto}.entry-sider-settings{display:grid;gap:4px;padding:14px 0 8px;margin-top:6px;border-top:1px solid var(--gc-line)}.entry-sider-settings .entry-sider-section-title{margin-bottom:6px}.entry-sider-setting{display:flex;align-items:center;gap:12px;width:calc(100% - 20px);margin:0 10px;padding:9px 10px;border-radius:14px;color:var(--gc-ink)}.entry-sider-switch{position:relative;width:42px;height:24px;flex:0 0 auto;border:none;border-radius:999px;background:#dadce0;color:transparent;cursor:pointer;display:grid;place-content:center right;padding:0 4px;transition:background .18s ease}.entry-sider-switch:after{content:"";position:absolute;top:3px;left:3px;width:18px;height:18px;border-radius:999px;background:#fff;box-shadow:0 1px 3px #3c404359;transition:transform .18s ease}.entry-sider-switch.is-on{background:var(--gc-blue)}.entry-sider-switch.is-on:after{transform:translate(18px)}.entry-sider-switch svg{position:relative;z-index:1;color:#fff}.entry-sider-switch:not(.is-on) svg{visibility:hidden}.entry-sider-seg{display:inline-grid;grid-auto-flow:column;gap:2px;padding:3px;border-radius:999px;background:#f1f3f4;flex:0 0 auto}.entry-sider-seg button{border:none;border-radius:999px;padding:5px 11px;background:transparent;color:var(--gc-muted);font-size:12px;font-weight:750;cursor:pointer;transition:background .16s ease,color .16s ease,box-shadow .16s ease}.entry-sider-seg button:hover,.entry-sider-seg button:focus-visible{color:var(--gc-ink);outline:none}.entry-sider-seg button.is-active{background:#fff;color:var(--gc-ink);box-shadow:0 1px 3px #3c40432e}.entry-sider-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:8px;padding:12px 18px;border-top:1px solid var(--gc-line);font-size:11px;font-weight:600;color:var(--gc-muted)}@media(prefers-reduced-motion:reduce){.entry-scrim,.entry-sider{animation:none}}.entry-gate-wordmark{display:flex;align-items:center;gap:10px;min-width:0}.entry-gate-wordmark-mark{width:36px;height:36px;flex:0 0 auto}.entry-gate-wordmark-mark svg{width:100%;height:100%;display:block}.entry-gate-wordmark-text{display:grid;gap:1px;min-width:0}.entry-gate-wordmark-text strong{font-size:16px;font-weight:800;letter-spacing:-.02em;color:var(--gc-ink);line-height:1.1}.entry-gate-wordmark-text span{font-size:12px;font-weight:600;color:var(--gc-muted)}.entry-gate-bar-actions{display:flex;align-items:center;gap:10px}.entry-gate-avatar{width:36px;height:36px;border-radius:999px;display:grid;place-items:center;background:linear-gradient(135deg,var(--gc-blue),var(--gc-green));color:#fff;font-size:13px;font-weight:800}.entry-gate-blocked{align-items:center;justify-content:center}.entry-gate-blocked-shell{width:min(480px,100%);min-height:auto;padding:40px 28px 32px;text-align:center;display:grid;gap:12px;justify-items:center;border-radius:0}.entry-gate-blocked-mark{width:72px;height:72px;border-radius:20px;display:grid;place-items:center;background:#f1f3f4;margin-bottom:4px}.entry-gate-blocked-shell h1{margin:0;font-size:22px;font-weight:800;color:var(--gc-ink)}.entry-gate-blocked-shell p{margin:0;font-size:14px;line-height:1.55;color:var(--gc-muted);max-width:36ch}.entry-gate-blocked-hint{font-size:12px!important;opacity:.85}.entry-gate-intro{display:block;padding:0 clamp(20px,4vw,48px);min-width:0}.entry-gate-intro-media{width:100%;max-width:100%;min-width:0;position:relative;overflow:hidden;border-radius:var(--app-radius);border:none;min-height:200px;background:#0f172a}.entry-banner-slider{touch-action:pan-y}.entry-banner-track{display:flex;width:100%;height:100%;transition:transform .55s cubic-bezier(.22,1,.36,1);will-change:transform}.entry-banner-slide{flex:0 0 100%;width:100%;min-width:100%;overflow:hidden}.entry-gate-intro-img{display:block;width:100%;max-width:100%;height:clamp(200px,26vw,280px);object-fit:cover;object-position:center 42%;-webkit-user-select:none;user-select:none;-webkit-user-drag:none}.entry-banner-dots{position:absolute;right:16px;bottom:14px;z-index:2;display:flex;gap:6px;pointer-events:auto}.entry-banner-dot{width:8px;height:8px;border:none;border-radius:999px;padding:0;background:#ffffff73;cursor:pointer;transition:width .2s ease,background .2s ease}.entry-banner-dot.is-active{width:22px;background:#fff}.entry-gate-intro-overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:flex-start;gap:14px 20px;padding:22px clamp(16px,3vw,28px);background:linear-gradient(180deg,#0f172a14,#0f172a38 42%,#0f172ab8);pointer-events:none}.entry-gate-eyebrow{margin:0 0 8px;font-size:11px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:#8d4e12}.entry-gate-intro h1{margin:0;font-size:clamp(24px,3.6vw,34px);line-height:1.1;letter-spacing:-.03em;font-weight:800;color:#3e2723}.entry-gate-lead{margin:8px 0 0;max-width:46ch;font-size:14px;line-height:1.55;color:#6d4c41}.entry-gate-intro-overlay .entry-gate-eyebrow{color:#a7f3d0;text-shadow:0 1px 8px rgba(15,23,42,.45)}.entry-gate-intro-overlay h1{color:#f8fafc;text-shadow:0 1px 10px rgba(15,23,42,.55)}.entry-gate-intro-overlay .entry-gate-lead{color:#f8fafce6;text-shadow:0 1px 8px 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