:root{--primary: #4f46e5;--primary-dark: #4338ca;--primary-light: #eef2ff;--accent: #f59e0b;--green: #16a34a;--green-light: #dcfce7;--red: #dc2626;--red-light: #fee2e2;--ink: #1e293b;--muted: #64748b;--line: #e2e8f0;--bg: #f1f5f9;--card: #ffffff;--radius: 14px;--shadow: 0 4px 16px rgba(15, 23, 42, .08);--tone1: #dc2626;--tone2: #ea580c;--tone3: #16a34a;--tone4: #2563eb;--tone5: #94a3b8}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Segoe UI,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--ink);min-height:100vh}.hidden{display:none!important}.screen{display:none}.screen.active{display:block}#confetti-canvas{position:fixed;top:0;right:0;bottom:0;left:0;width:100vw;height:100vh;pointer-events:none;z-index:999}.btn{border:none;border-radius:10px;cursor:pointer;font:inherit;font-weight:600;padding:10px 18px;transition:transform .08s,background .15s,box-shadow .15s}.btn:active{transform:scale(.97)}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 3px 10px #4f46e559}.btn-primary:hover{background:var(--primary-dark)}.btn-lg{padding:13px 26px;font-size:1.05rem}.btn-ghost{background:transparent;color:var(--primary)}.btn-ghost:hover{background:var(--primary-light)}.btn:disabled{opacity:.55;cursor:default}.brand{display:flex;align-items:center;gap:10px}.brand-logo{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),#8b5cf6);color:#fff;font-size:1.6rem;font-weight:800}.brand-sm .brand-logo{width:36px;height:36px;font-size:1.05rem}.brand-logo{letter-spacing:-.04em}.brand h1{font-size:2rem}.brand-name{font-size:1.25rem;font-weight:800}.brand-accent{color:var(--accent)}#screen-auth{min-height:100vh;background:linear-gradient(135deg,#4f46e5,#7c3aed 55%,#db2777);display:none;padding:40px 20px}#screen-auth.active{display:grid;place-items:center}.auth-hero{display:grid;grid-template-columns:minmax(340px,440px) 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auto;padding:28px 20px 60px}.page-head{margin-bottom:22px}.page-head h2{font-size:1.6rem;margin-bottom:4px}.section-title{margin:28px 0 14px;font-size:1.15rem}.topic-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:18px;overflow:hidden}.topic-head{display:flex;align-items:center;gap:14px;padding:16px 20px;cursor:pointer;-webkit-user-select:none;user-select:none}.topic-head:hover{background:#f8fafc}.topic-icon{font-size:1.6rem}.topic-head h3{flex:1;font-size:1.1rem}.topic-progress{min-width:160px;height:10px;border-radius:999px;background:var(--bg);overflow:hidden}.topic-progress-fill{height:100%;background:linear-gradient(90deg,var(--primary),#8b5cf6);transition:width .4s}.topic-pct{font-weight:700;color:var(--muted);font-size:.9rem;min-width:44px;text-align:right}.topic-caret{color:var(--muted);transition:transform .2s}.topic-card.open .topic-caret{transform:rotate(90deg)}.skill-list{display:none;border-top:1px solid var(--line)}.topic-card.open .skill-list{display:block}.skill-row{display:flex;align-items:center;gap:16px;padding:14px 20px 14px 58px;border-top:1px solid #f1f5f9;cursor:pointer}.skill-row:hover{background:var(--primary-light)}.skill-code{font-weight:800;color:var(--primary);background:var(--primary-light);border-radius:8px;padding:4px 10px;font-size:.9rem;white-space:nowrap}.skill-name{flex:1;font-weight:600}.medallion{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;font-weight:800;font-size:.85rem;border:3px solid 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p{color:var(--muted);font-size:.88rem;line-height:1.4}.award-date{display:block;margin-top:8px;font-size:.78rem;color:var(--green);font-weight:700}.practice-head{display:flex;align-items:center;gap:18px;margin-bottom:22px;flex-wrap:wrap}.practice-title{display:flex;align-items:center;gap:12px}.practice-title h2{font-size:1.35rem}.practice-layout{display:grid;grid-template-columns:1fr 300px;gap:24px;align-items:start}@media(max-width:860px){.practice-layout{grid-template-columns:1fr}}.question-panel{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:30px}.question-prompt{font-size:1.5rem;font-weight:600;line-height:1.5;margin-bottom:26px;min-height:2.2em}.math{font-family:"Cambria Math",Georgia,serif;background:var(--primary-light);border-radius:8px;padding:2px 10px;white-space:nowrap}#answer-area{margin-bottom:22px}.answer-input{width:220px;max-width:100%;padding:14px 16px;font-size:1.3rem;font-weight:700;border:3px solid var(--line);border-radius:12px;text-align:center}.answer-input:focus{outline:none;border-color:var(--primary)}.choices{display:grid;gap:10px;max-width:420px}.choice-btn{padding:13px 18px;border:2px solid var(--line);border-radius:12px;background:#fff;font:inherit;font-size:1.05rem;font-weight:600;cursor:pointer;text-align:left;transition:border .12s,background .12s}.choice-btn:hover{border-color:var(--primary);background:var(--primary-light)}.choice-btn.selected{border-color:var(--primary);background:var(--primary-light);box-shadow:0 0 0 2px var(--primary) inset}.practice-actions{display:flex;gap:12px}.feedback{margin-top:22px;border-radius:12px;padding:18px 20px;animation:pop .25s ease}@keyframes pop{0%{transform:scale(.96);opacity:0}to{transform:scale(1);opacity:1}}.feedback.good{background:var(--green-light);border:2px solid #86efac}.feedback.bad{background:var(--red-light);border:2px solid #fca5a5}.feedback h3{margin-bottom:6px;font-size:1.1rem}.feedback.good h3{color:var(--green)}.feedback.bad h3{color:var(--red)}.feedback .explain{line-height:1.55}.feedback .explain .math{background:#fff}.score-panel{display:grid;gap:16px;position:sticky;top:84px}.score-card,.session-card,.session-rewards{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}.score-label{color:var(--muted);font-weight:700;text-transform:uppercase;letter-spacing:.06em;font-size:.78rem}.score-value{font-size:3.2rem;font-weight:900;line-height:1.1;color:var(--primary);transition:color .3s}.score-value.bounce{animation:bounce .45s ease}@keyframes bounce{30%{transform:scale(1.18)}}.score-value.gold{color:var(--accent)}.score-bar{position:relative;height:18px;border-radius:999px;background:var(--bg);overflow:hidden;margin-top:10px}.zone-challenge{position:absolute;right:0;top:0;bottom:0;width:10%;background:repeating-linear-gradient(45deg,#fde68a 0,#fde68a 6px,#fef3c7 6px,#fef3c7 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12px}.practice-banner{width:100%;background:#fef3c7;border:2px solid #fbbf24;border-radius:12px;padding:10px 16px;font-weight:600;color:#78350f}.student-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:12px;padding:16px 20px}.student-head{display:flex;align-items:center;gap:12px;cursor:pointer;flex-wrap:wrap}.student-stats{color:var(--muted);font-size:.9rem;flex:1}.student-card.open .topic-caret{transform:rotate(90deg)}.student-detail{margin-top:14px}.hw-mini{color:var(--muted);font-size:.9rem;margin:4px 0}.assign-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;margin-bottom:10px}.assign-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin-bottom:16px}.assign-grid label{display:block;font-weight:600;font-size:.9rem}.assign-grid input,.assign-grid select{width:100%;margin-top:6px;padding:10px 12px;border:2px solid var(--line);border-radius:10px;font:inherit}.assign-grid input:focus,.assign-grid select:focus{outline:none;border-color:var(--primary)}.assign-topic{margin-bottom:12px}.assign-skill{display:block;font-weight:500;font-size:.9rem;margin:5px 0 5px 8px;cursor:pointer}.assign-skill input{margin-right:6px}.assign-row{display:flex;align-items:center;gap:16px;flex-wrap:wrap;background:var(--card);border-radius:12px;box-shadow:var(--shadow);padding:12px 18px;margin-bottom:10px}.assign-row .assign-del{margin-left:auto}.learn-grid{display:grid;grid-template-columns:1fr 300px;gap:24px;align-items:start}@media(max-width:860px){.learn-grid{grid-template-columns:1fr}}.lesson-board{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}.lesson-controls{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:8px}.level-tabs{display:flex;background:var(--bg);border-radius:10px;padding:4px}.eq-stage{padding:30px 10px 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h4{margin-bottom:12px}.lesson-step{display:flex;gap:12px;padding:10px;border-radius:10px;margin-bottom:6px;color:var(--muted)}.lesson-step.step-current{background:var(--primary-light);color:var(--ink)}.lesson-step.step-done{color:var(--green)}.step-num{width:26px;height:26px;border-radius:50%;flex-shrink:0;background:var(--bg);display:grid;place-items:center;font-weight:800;font-size:.85rem}.step-current .step-num{background:var(--primary);color:#fff}.step-done .step-num{background:var(--green-light)}.step-text{font-weight:600;font-size:.95rem}.step-why{font-size:.82rem;margin-top:3px;line-height:1.4}.graph-wrap{position:relative;text-align:center}.graph-svg{max-width:100%;height:auto;background:#fff;border:2px solid var(--line);border-radius:12px}.graph-eq{font-family:"Cambria 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var(--line);border-radius:10px;font:inherit}.form-vertical input:focus,.form-vertical select:focus{outline:none;border-color:var(--primary)}.admin-wrap{max-width:1000px;margin:0 auto;padding:24px 20px;display:grid;gap:24px}.admin-card{background:var(--card);border-radius:var(--radius);padding:24px;box-shadow:0 2px 10px #0f172a0f}.admin-card h2{margin:0 0 16px;font-size:1.2rem}.admin-form-row{display:grid;grid-template-columns:1fr 1fr 160px;gap:14px}@media(max-width:720px){.admin-form-row{grid-template-columns:1fr}}.admin-table{width:100%;border-collapse:collapse}.admin-table th,.admin-table td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--line);font-size:.95rem;vertical-align:middle}.admin-table th{color:var(--muted);font-size:.8rem;text-transform:uppercase;letter-spacing:.05em}.admin-table td.row-actions{white-space:nowrap;text-align:right}.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9em}.muted{color:var(--muted)}.role-badge{display:inline-block;padding:2px 10px;border-radius:999px;font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em}.role-student{background:#eef2ff;color:var(--primary)}.role-teacher{background:#ecfdf5;color:#047857}.role-admin{background:#fef3c7;color:#b45309}.filter-chips{display:flex;gap:8px;margin-bottom:12px;flex-wrap:wrap}.chip{padding:6px 14px;border-radius:999px;border:2px solid var(--line);background:#fff;cursor:pointer;font:inherit;font-weight:600;font-size:.85rem}.chip.active{border-color:var(--primary);color:var(--primary)}.pw-banner{background:#ecfdf5;border:2px solid #6ee7b7;border-radius:10px;padding:14px 16px;margin-bottom:14px}.pw-banner code{font-size:1.1rem;background:#fff;padding:2px 8px;border-radius:6px;border:1px solid var(--line)}.pw-banner .pw-note{margin-top:8px;color:var(--muted);font-size:.85rem}.roster-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:8px;margin:14px 0}.roster-list label{display:flex;align-items:center;gap:8px;font-weight:500;font-size:.95rem;margin:0;padding:8px 10px;border:2px solid var(--line);border-radius:10px;cursor:pointer}.roster-list label:has(input:checked){border-color:var(--primary);background:#eef2ff}.icon-btn{border:none;background:transparent;cursor:pointer;font-size:1.05rem;padding:4px 6px;border-radius:6px}.icon-btn:hover{background:var(--bg)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a8c;display:grid;place-items:center;z-index:50}.modal-card{background:var(--card);border-radius:16px;padding:28px;width:min(92vw,380px);box-shadow:0 20px 60px #0000004d}.modal-card h3{margin:0 0 16px}.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:6px}.auth-hint{color:var(--muted);font-size:.85rem;margin-top:16px;text-align:center}.frame-note{margin-top:14px;padding:12px 18px;border-radius:10px;background:var(--primary-light);color:var(--ink);font-size:1.02rem;line-height:1.5;text-align:center;animation:chip-in .35s ease}.expr-list{margin-bottom:12px}.expr-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:8px}.expr-dot{width:14px;height:14px;border-radius:50%;flex-shrink:0}.expr-y{font-family:"Cambria Math",Georgia,serif;font-weight:700;color:var(--muted)}.expr-input{flex:1;min-width:160px;padding:9px 12px;border:2px solid var(--line);border-radius:10px;font:inherit;font-family:"Cambria Math",Georgia,serif;font-size:1.05rem}.expr-input:focus{outline:none;border-color:var(--primary)}.expr-input.invalid{border-color:var(--red)}.expr-del{padding:4px 8px}.expr-error{width:100%;color:var(--red);font-size:.82rem;padding-left:24px}.expr-add{margin-top:2px}.graph-facts code{background:var(--primary-light);color:var(--primary);border-radius:5px;padding:1px 6px;font-size:.85em}.grade-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}.grade-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;cursor:pointer;transition:transform .12s,box-shadow .12s}.grade-card:hover{transform:translateY(-3px);box-shadow:0 10px 28px 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var(--primary);outline-offset:2px}.passage{background:#f8fafc;border-left:4px solid var(--primary);border-radius:8px;padding:12px 16px;line-height:1.55;font-size:1rem}.category-head{margin:22px 0 8px;font-size:1.05rem;color:var(--primary);text-transform:uppercase;letter-spacing:.04em}details.fold{margin-bottom:8px}details.fold>summary{cursor:pointer;font-weight:700;padding:6px 0}.ftc-svg{width:100%;height:auto;display:block;background:var(--card);border:1px solid var(--line);border-radius:10px}.ftc-grid{stroke:var(--line);stroke-width:1}.ftc-axis{stroke:#64748b;stroke-width:1.5}.ftc-tick{font-size:11px;fill:var(--muted)}.ftc-picker{margin:10px 0}.ftc-picker .level-tabs{flex-wrap:wrap}.ftc-custom{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:8px}.ftc-input{flex:1;min-width:180px;padding:8px 10px;border:2px solid 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0}.grade-select{padding:4px 8px;border-radius:8px;border:1px solid var(--line);font:inherit}.bed-letters{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin:6px 0 4px}.bed-letter{display:flex;flex-direction:column;align-items:center;min-width:74px;padding:6px 8px;border:2px solid;border-radius:12px;background:#fff;transition:all .25s}.bed-letter strong{font-size:1.5rem;line-height:1}.bed-letter small{font-size:.7rem;font-weight:600}.bed-letter.on{color:#fff;transform:translateY(-3px) scale(1.06);box-shadow:0 6px 16px #0f172a2e}.bed-expr{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:6px;font-size:1.8rem;font-weight:700;margin:10px 0 18px}.bed-tok{padding:4px 10px;border-radius:10px;border:2px solid transparent;transition:background .3s,color .3s}.bed-op{color:var(--primary)}.bed-par{color:#7c3aed;padding:4px 2px}.bed-group{background:#7c3aed1f}.bed-fresh{animation:pop .45s 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.1s}.tone-card:hover:not(:disabled),.tone-card:focus-visible{transform:translateY(-2px);border-color:var(--primary)}.tone-card.tone-c1{border-top:6px solid var(--tone1)}.tone-card.tone-c2{border-top:6px solid var(--tone2)}.tone-card.tone-c3{border-top:6px solid var(--tone3)}.tone-card.tone-c4{border-top:6px solid var(--tone4)}.tone-card.right{background:var(--green-light);border-color:var(--green)}.tone-card.wrong{background:var(--red-light);border-color:var(--red)}.tone-card-head{display:flex;justify-content:space-between;gap:6px;font-size:.9rem}.tone-card .small,.tone-lab .small{font-size:.82rem;margin:6px 0 0}.tone-char{margin:4px 0}.tone-svg{width:100%;max-width:240px;height:auto;display:block;margin:6px auto;background:#f8fafc;border-radius:8px}.tone-grid{stroke:#e2e8f0;stroke-width:1}.tone-path{fill:none;stroke-width:7;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:100;stroke-dashoffset:0}.tone-path.tracing{animation:tone-trace .75s ease-in-out both}@keyframes 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14px;border-bottom:1px solid var(--line);flex-wrap:wrap}.chat-challenge{margin-left:auto}.chat-back{display:none;padding:4px 10px}.chat-messages{flex:1;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:10px}.chat-empty{margin:auto;text-align:center;padding:30px}.msg{display:flex;flex-direction:column;max-width:78%}.msg.mine{align-self:flex-end;align-items:flex-end}.msg.theirs{align-self:flex-start;align-items:flex-start}.msg-bubble{padding:9px 13px;border-radius:16px;background:var(--bg);white-space:pre-wrap;overflow-wrap:anywhere}.msg.mine .msg-bubble{background:var(--primary);color:#fff;border-bottom-right-radius:4px}.msg.theirs .msg-bubble{border-bottom-left-radius:4px}.msg.kind-result{align-self:center;align-items:center;max-width:90%}.msg-system{font-size:.88rem;font-weight:600;color:var(--muted);background:#fef3c7;border-radius:999px;padding:4px 12px}.msg-time{margin-top:2px;font-size:.72rem}.msg .challenge-card{margin-top:6px;min-width:min(360px,70vw)}.chat-compose{display:flex;gap:8px;padding:10px;border-top:1px solid var(--line)}.chat-compose input{flex:1;padding:10px 12px;border:2px solid var(--line);border-radius:10px;font:inherit}.chat-compose input:focus{outline:none;border-color:var(--primary)}@media(max-width:720px){.chat{grid-template-columns:1fr}.chat.has-open .chat-list{display:none}.chat:not(.has-open) .chat-pane{display:none}.chat-back{display:inline-block}.msg{max-width:92%}}.challenge-card{background:var(--card);border:2px solid var(--line);border-left:6px solid var(--primary);border-radius:var(--radius);padding:12px 14px;margin-bottom:10px;text-align:left;color:var(--ink)}.challenge-card.status-pending{border-left-color:var(--accent)}.challenge-card.won{border-left-color:var(--green)}.challenge-card.lost{border-left-color:#94a3b8}.challenge-card.status-declined,.challenge-card.status-cancelled{opacity:.7;border-left-color:var(--line)}.challenge-head{display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap}.challenge-status{font-weight:700;font-size:.9rem}.challenge-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:8px}.challenge-actions .small:last-child{margin-left:auto}.race-bars{display:flex;flex-direction:column;gap:5px;margin-top:8px}.race-bar{display:grid;grid-template-columns:minmax(60px,110px) 1fr auto;gap:8px;align-items:center;font-size:.85rem}.race-bar span{font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.race-bar div{height:12px;border-radius:999px;background:var(--bg);overflow:hidden}.race-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--primary),#8b5cf6);border-radius:999px;transition:width .4s}.race-bar.rival i{background:linear-gradient(90deg,#f59e0b,#ef4444)}.race-bar em{font-style:normal;color:var(--muted);font-size:.78rem}.challenge-banner .race-bars{max-width:520px}.challenge-banner.won{background:var(--green-light)}.challenge-banner.lost{background:#fef3c7}.challenge-modal{width:min(94vw,640px);max-height:88vh;overflow-y:auto}.challenge-modal p{margin-bottom:10px}.pick-row{display:block;width:100%;text-align:left;padding:10px 12px;margin-bottom:6px;border:2px solid var(--line);border-radius:10px;background:var(--card);cursor:pointer;font:inherit;color:inherit}.pick-row:hover,.pick-row:focus-visible{border-color:var(--primary)}.pick-row.picked{border-color:var(--primary);background:var(--primary-light)}.pick-skills{max-height:34vh;overflow-y:auto;border:1px solid var(--line);border-radius:10px;padding:8px;margin-top:8px}.pick-section{margin:8px 0 2px;font-weight:700}.challenge-picked{margin-top:12px}.challenge-picked h4{margin-bottom:6px}.picked-item{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:4px 0;border-bottom:1px solid var(--line)}.picked-item>span{flex:1;min-width:200px}.picked-item input{width:56px;padding:4px}.challenge-picked label.block{display:block;margin-top:8px;font-weight:600}.challenge-picked label.block input{display:block;width:100%;margin-top:4px;padding:8px 10px;border:2px solid var(--line);border-radius:8px;font:inherit}.h2h{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px;margin-bottom:18px}.h2h-row{display:flex;flex-direction:column;gap:2px;padding:12px;border:2px solid var(--line);border-radius:var(--radius);background:var(--card);cursor:pointer;font:inherit;color:inherit;text-align:left}.h2h-row:hover,.h2h-row:focus-visible{border-color:var(--primary)}.h2h-score{font-size:1.4rem;font-weight:800}.h2h-score .won{color:var(--green)}.h2h-score .lost{color:var(--muted)}.icon-btn{position:relative;width:40px;height:40px;border-radius:12px;border:0;background:transparent;font-size:1.25rem;cursor:pointer;display:grid;place-items:center}.icon-btn:hover,.icon-btn:focus-visible{background:var(--primary-light)}.icon-btn.active{background:var(--primary-light);box-shadow:inset 0 0 0 2px var(--primary)}.icon-btn .nav-badge{position:absolute;top:-2px;right:-4px;margin:0}.topbar{flex-wrap:wrap;row-gap:6px;column-gap:16px}.main-nav{flex:1 1 0;min-width:0;flex-wrap:wrap}.nav-btn{padding:8px 12px;white-space:nowrap}.user-chip{gap:8px;flex:none}@media(max-width:1320px){.greeting{display:none}}@media(max-width:760px){.topbar{padding:8px 12px}.main-nav{order:3;flex:1 0 100%;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none}.main-nav::-webkit-scrollbar{display:none}.user-chip{margin-left:auto;flex:1 1 auto;min-width:0;flex-wrap:wrap;justify-content:flex-end;gap:4px}.user-chip .stars-chip{padding:3px 8px;font-size:.82rem}.user-chip .btn{padding:6px 8px}.icon-btn{width:34px;height:34px}}.pw-field{display:flex;gap:6px;align-items:center}.pw-field input{flex:1}.chat-head-actions{margin-left:auto;display:flex;align-items:center;gap:4px}.chat-head-actions .chat-challenge{margin-left:4px}.icon-btn:disabled{opacity:.4;cursor:default}.compose-tools{position:relative;display:flex;align-items:center;gap:2px}.emoji-pop{position:absolute;bottom:48px;left:0;z-index:30;width:300px;background:var(--card);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:8px}.emoji-tabs{display:flex;gap:2px;border-bottom:1px solid var(--line);padding-bottom:6px;margin-bottom:6px}.emoji-tabs button{flex:1;border:0;background:transparent;font-size:1.15rem;padding:4px;border-radius:8px;cursor:pointer}.emoji-tabs button.on{background:var(--primary-light)}.emoji-grid{display:grid;grid-template-columns:repeat(8,1fr);gap:2px;max-height:190px;overflow-y:auto}.emoji-grid button{border:0;background:transparent;font-size:1.35rem;padding:3px;border-radius:8px;cursor:pointer;line-height:1.2}.emoji-grid button:hover,.emoji-grid button:focus-visible{background:var(--bg)}.msg-emoji{font-size:2.6rem;line-height:1.15}.msg-system.call{background:var(--primary-light);color:var(--primary)}.chat-img-btn{border:0;padding:0;background:transparent;cursor:zoom-in;border-radius:14px}.chat-img{display:block;max-width:min(260px,60vw);max-height:320px;border-radius:14px;border:1px solid var(--line)}.chat-img.loading{width:200px;height:140px;background:linear-gradient(90deg,var(--bg),#e2e8f0,var(--bg));background-size:200% 100%;animation:shimmer 1.2s infinite}.chat-img.missing{padding:14px;color:var(--muted);background:var(--bg)}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.chat-messages.dragging{outline:3px dashed var(--primary);outline-offset:-8px;background:var(--primary-light)}.lightbox{position:fixed;top:0;right:0;bottom:0;left:0;z-index:120;background:#0f172ad9;display:grid;place-items:center;padding:20px;cursor:zoom-out}.lightbox img{max-width:100%;max-height:90vh;border-radius:10px;box-shadow:0 20px 60px #00000080}.lightbox-close{position:absolute;top:14px;right:18px;width:42px;height:42px;border-radius:50%;border:0;background:#fff;font-size:1.1rem;cursor:pointer}.call-avatar{width:64px;height:64px;border-radius:50%;display:grid;place-items:center;font-size:1.6rem;font-weight:800;background:linear-gradient(135deg,var(--primary),#8b5cf6)}.call-avatar.big{width:96px;height:96px;font-size:2.4rem}.call-avatar.pulse{animation:call-pulse 1.6s infinite}@keyframes call-pulse{0%{box-shadow:0 0 #8b5cf699}to{box-shadow:0 0 0 22px #8b5cf600}}.call-float{position:fixed;z-index:110;background:#0f172a;color:#fff;border-radius:16px;box-shadow:0 18px 50px #00000073;overflow:hidden;display:flex;flex-direction:column;-webkit-user-select:none;user-select:none}.call-float.incoming{animation:call-in .3s ease-out;outline:3px solid var(--green)}@keyframes call-in{0%{transform:translateY(24px);opacity:0}to{transform:none;opacity:1}}.call-float audio{display:none}.call-bar{display:flex;align-items:center;gap:6px;padding:8px 8px 8px 10px;cursor:grab;touch-action:none;background:#ffffff0f}.call-bar:active{cursor:grabbing}.call-bar:focus-visible{outline:2px solid #a5b4fc;outline-offset:-2px}.call-grip{color:#94a3b8;font-size:.9rem}.call-title{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:.9rem}.call-status{color:#cbd5e1;font-size:.82rem;margin-left:4px}.call-mini{width:28px;height:28px;border-radius:8px;border:0;background:#ffffff1f;color:#fff;cursor:pointer;font-size:.95rem;line-height:1;flex:none}.call-mini:hover,.call-mini:focus-visible{background:#ffffff40}.call-mini.hang{background:var(--red)}.call-voice{display:grid;place-items:center;padding:18px 0 6px}.call-stage{position:relative;width:100%;aspect-ratio:4 / 3;background:#000;display:grid;place-items:center}.call-stage .call-avatar{position:absolute}.call-remote{width:100%;height:100%;object-fit:cover;display:block}.call-local{position:absolute;right:8px;bottom:8px;width:28%;min-width:64px;border-radius:8px;border:2px solid #fff;transform:scaleX(-1);background:#111}.call-local.off{visibility:hidden}.call-controls{display:flex;justify-content:center;gap:12px;padding:10px}.call-btn{width:46px;height:46px;border-radius:50%;border:0;font-size:1.2rem;cursor:pointer;background:#334155;color:#fff}.call-btn:hover,.call-btn:focus-visible{filter:brightness(1.2)}.call-btn.off{background:#f59e0b}.call-btn.accept{background:var(--green)}.call-btn.hang{background:var(--red);font-weight:800}.call-resize{position:absolute;right:0;bottom:0;width:22px;height:22px;cursor:nwse-resize;touch-action:none;background:linear-gradient(135deg,transparent 50%,rgba(255,255,255,.55) 50%,rgba(255,255,255,.55) 58%,transparent 58%,transparent 70%,rgba(255,255,255,.55) 70%,rgba(255,255,255,.55) 78%,transparent 78%)}@media(prefers-reduced-motion:reduce){.call-avatar.pulse,.call-float.incoming,.chat-img.loading{animation:none}}.rc-passage{max-height:52vh;overflow-y:auto;line-height:1.65}.rc-passage p{margin:0 0 10px}.rc-title{margin:0 0 4px;font-size:1.05rem}.rc-by{color:var(--muted);font-size:.85rem;margin-bottom:10px;font-style:italic}.rc-pn{display:inline-grid;place-items:center;min-width:22px;height:22px;margin-right:8px;border-radius:6px;background:var(--primary-light);color:var(--primary);font-size:.75rem;font-weight:800;vertical-align:1px}.rc-poem .rc-stanza{margin:0 0 14px;font-style:italic}.rc-pic{font-size:2.4rem;text-align:center;margin-bottom:6px}.rc-q{margin-top:12px;font-weight:700}.practice-ended{text-align:center;padding:28px 12px}.practice-ended .ended-emoji{font-size:3.2rem;line-height:1;margin-bottom:10px}.practice-ended h3{margin:0 0 8px}.practice-ended .practice-actions{justify-content:center;gap:10px;flex-wrap:wrap;margin-top:18px}