:root{--bg:#f6f7f9;--surface:#ffffff;--text:#16181d;--muted:#5f6672;--border:#e2e5ea;--primary:#1f5eff;--primary-text:#ffffff;--success:#12804a;--success-bg:#e6f5ec;--warn:#9a5b00;--warn-bg:#fff4e0;--danger:#b42318;--danger-bg:#fdecea;--locked-bg:#eef0f3;--radius:10px;--shadow:0 1px 2px rgba(16,24,40,0.06);color-scheme:light}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#0f1115;--surface:#171a21;--text:#e8eaee;--muted:#9aa2ae;--border:#2a2f3a;--primary:#5b8cff;--success:#4cc38a;--success-bg:#12291e;--warn:#f0b45a;--warn-bg:#2d2412;--danger:#f97066;--danger-bg:#2f1715;--locked-bg:#1d2129;--shadow:none;color-scheme:dark}}:root[data-theme=dark]{--bg:#0f1115;--surface:#171a21;--text:#e8eaee;--muted:#9aa2ae;--border:#2a2f3a;--primary:#5b8cff;--success:#4cc38a;--success-bg:#12291e;--warn:#f0b45a;--warn-bg:#2d2412;--danger:#f97066;--danger-bg:#2f1715;--locked-bg:#1d2129;--shadow:none;color-scheme:dark}.page-loading-bar{position:fixed;top:0;left:0;height:3px;width:40%;background:var(--primary);animation:loading-bar 1s ease-in-out infinite}@keyframes loading-bar{0%{left:-40%}to{left:100%}}.skeleton{background:var(--locked-bg);border-radius:8px;margin-bottom:14px;animation:pulse 1.2s ease-in-out infinite}.skeleton-title{height:28px;width:40%}.skeleton-line{height:14px;width:65%}.skeleton-block{height:220px;width:100%}@keyframes pulse{50%{opacity:.55}}@media (prefers-reduced-motion:reduce){.page-loading-bar,.skeleton{animation:none}}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.theme-toggle{display:inline-flex;align-items:center;gap:6px}.theme-toggle svg{width:16px;height:16px}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:15px;line-height:1.5}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 24px;background:var(--surface);border-bottom:1px solid var(--border)}.brand{font-weight:700;font-size:17px;color:var(--text)}.brand span{color:var(--primary)}.topnav{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.topnav a{color:var(--muted);font-weight:500}.topnav a.active,.topnav a:hover{color:var(--text);text-decoration:none}.container{max-width:1100px;margin:0 auto;padding:24px 16px 64px}.narrow{max-width:760px}h1{font-size:24px;margin:0 0 4px}h2{font-size:18px;margin:28px 0 12px}.sub{color:var(--muted);margin:0 0 20px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}.stack{display:grid;grid-gap:12px;gap:12px}.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.spread{justify-content:space-between}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 16px;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--text);font:inherit;font-weight:600;cursor:pointer}.btn:hover{text-decoration:none;filter:brightness(.97)}.btn-primary{background:var(--primary);border-color:var(--primary);color:var(--primary-text)}.btn-danger{color:var(--danger)}.btn-small{padding:5px 10px;font-size:13px}.btn:disabled{opacity:.55;cursor:not-allowed}.badge{display:inline-block;padding:2px 10px;border-radius:999px;font-size:12px;font-weight:600}.badge-passed{background:var(--success-bg);color:var(--success)}.badge-in_progress{background:var(--warn-bg);color:var(--warn)}.badge-open{color:var(--text)}.badge-locked,.badge-open{background:var(--locked-bg)}.badge-locked{color:var(--muted)}.badge-inactive{background:var(--danger-bg);color:var(--danger)}.lesson{display:grid;grid-template-columns:44px 1fr auto;grid-gap:14px;gap:14px;align-items:center}.lesson.locked{opacity:.6}.lesson-num{width:44px;height:44px;border-radius:50%;display:grid;place-items:center;background:var(--locked-bg);font-weight:700}.lesson.passed .lesson-num{background:var(--success-bg);color:var(--success)}.lesson-title{font-weight:600}.lesson-meta{color:var(--muted);font-size:13px}.progress{height:10px;background:var(--locked-bg);border-radius:999px;overflow:hidden}.progress>div{height:100%;background:var(--success)}table{width:100%;border-collapse:collapse;background:var(--surface)}.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius)}td,th{text-align:left;padding:10px 12px;border-bottom:1px solid var(--border);vertical-align:top}th{font-size:12px;text-transform:uppercase;letter-spacing:.03em;color:var(--muted);background:var(--bg)}tr:last-child td{border-bottom:none}.empty{color:var(--muted);font-style:italic}label{display:grid;grid-gap:4px;gap:4px;font-weight:600;font-size:13px}input,select,textarea{font:inherit;color:var(--text);background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:8px 10px;width:100%}textarea{min-height:110px;resize:vertical}textarea.tall{min-height:360px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px}.form-grid{display:grid;grid-gap:14px;gap:14px}.form-grid.two{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}.checkbox{display:flex;gap:8px;align-items:center;font-weight:500}.checkbox input{width:auto}.notice{padding:10px 14px;border-radius:8px;font-size:14px}.notice-error{background:var(--danger-bg);color:var(--danger)}.notice-ok{background:var(--success-bg);color:var(--success)}.notice-info{background:var(--locked-bg);color:var(--text)}.login-wrap{min-height:100vh;display:grid;place-items:center;padding:16px}.login-card{width:100%;max-width:380px}.home-grid{display:grid;grid-template-columns:minmax(0,2fr) minmax(260px,1fr);grid-gap:20px;gap:20px;align-items:start}.lesson-row{display:grid;grid-template-columns:36px 1fr;grid-gap:12px;gap:12px;align-items:center;padding:12px 14px}.lesson-row .lesson-num{width:36px;height:36px}.lesson-row.locked{opacity:.6}.lesson-row.passed .lesson-num{background:var(--success-bg);color:var(--success)}.lesson-row.current{border-color:var(--primary)}.agent-header{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.agent-avatar{width:56px;height:56px;border-radius:50%;display:grid;place-items:center;flex:none;background:var(--primary);color:var(--primary-text);font-weight:700;letter-spacing:.04em}.agent-actions{margin-left:auto;display:flex;gap:8px}.voice-panel{display:grid;grid-gap:18px;gap:18px}@media (max-width:860px){.home-grid{grid-template-columns:1fr}}.agent-state{color:var(--muted);font-weight:600;text-transform:capitalize}.visualizer{height:120px;display:flex;align-items:center;justify-content:center}.visualizer .lk-audio-bar-visualizer{height:100%;width:100%;max-width:360px;gap:8px}.visualizer .lk-audio-bar{background:var(--border);border-radius:6px;width:24px}.visualizer .lk-audio-bar[data-lk-highlighted=true]{background:var(--primary)}.transcript{max-height:380px;overflow-y:auto;display:grid;grid-gap:10px;gap:10px;padding:4px}.line{padding:8px 12px;border-radius:10px;max-width:85%;white-space:pre-wrap}.line.agent{background:var(--locked-bg);justify-self:start}.line.user{background:var(--primary);color:var(--primary-text);justify-self:end}.line .who{font-size:11px;font-weight:700;opacity:.75;display:block;margin-bottom:2px}.pre{white-space:pre-wrap}@media (max-width:640px){.topbar{padding:12px 16px}.lesson{grid-template-columns:36px 1fr}.lesson>:last-child{grid-column:1/-1}.lesson-num{width:36px;height:36px}}