:root{--bg: #11131a;--card: rgba(255, 255, 255, .06);--card-border: rgba(255, 255, 255, .12);--primary: #ff7a45;--primary-dark: #ff9466;--text: #f5f6f8;--muted: #a7afbd;--ring: rgba(255, 122, 69, .25);--red: #ff3b30;font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);-webkit-tap-highlight-color:transparent}.app{max-width:480px;margin:0 auto;min-height:100vh;min-height:100dvh;display:flex;flex-direction:column;color:var(--text);background:radial-gradient(120% 80% at 50% 0%,#ff7a4547,#ff7a4500 55%),linear-gradient(180deg,#1a1410,#14151c 45%,#0d0e13)}.screen{flex:1;display:flex;flex-direction:column;padding:16px}.card{background:var(--card);border:1px solid var(--card-border);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-radius:16px;padding:20px;color:var(--text);box-shadow:0 6px 24px #00000047}.btn-primary{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:none;width:100%;padding:18px;border-radius:16px;background:var(--primary);color:#fff;font-size:20px;font-weight:700;cursor:pointer}.btn-primary:active{background:var(--primary-dark)}.btn-primary:disabled{opacity:.5}.btn-ghost{-webkit-appearance:none;-moz-appearance:none;appearance:none;background:#ffffff0a;border:1px solid var(--card-border);color:var(--text);border-radius:12px;padding:10px 14px;font-size:15px;cursor:pointer}.btn-ghost:active{background:#ffffff1a}.muted{color:var(--muted)}.today-welcome{padding:4px 4px 0}.today-welcome h2{font-size:24px}.option-card{position:relative;display:block;width:100%;-webkit-appearance:none;-moz-appearance:none;appearance:none;font:inherit;padding-right:44px;cursor:pointer;transition:transform .1s ease,background .15s ease,border-color .15s ease}.option-card:after{content:"›";position:absolute;right:18px;top:50%;transform:translateY(-50%);font-size:26px;font-weight:400;color:var(--muted);line-height:1}.option-card:active{transform:scale(.99);background:#ffffff1a;border-color:var(--ring)}.app-header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-bottom:20px}.app-logo{-webkit-appearance:none;-moz-appearance:none;appearance:none;background:transparent;border:none;padding:0;font-size:16px;font-weight:800;color:var(--primary-dark);cursor:pointer;white-space:nowrap}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1000;background:#0000008c;display:flex;align-items:center;justify-content:center;padding:24px}.modal-card{width:100%;max-width:360px}.modal-actions{display:flex;flex-direction:column;gap:10px;margin-top:16px}.ptt-btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:none;width:100%;padding:22px;border-radius:18px;background:var(--primary);color:#fff;font-size:20px;font-weight:700;cursor:pointer;user-select:none;-webkit-user-select:none;touch-action:none}.ptt-btn:active{background:var(--primary-dark);transform:scale(.99)}.ptt-btn:disabled{opacity:.5}.draft-area{min-height:44px;margin:0 2px 12px;padding:10px 14px;border-radius:14px;background:#ffffff0d;border:1px solid var(--card-border);font-size:16px;line-height:1.5;word-break:break-word}.bubble-toggle{-webkit-appearance:none;-moz-appearance:none;appearance:none;background:#ffffff0d;border:1px solid var(--card-border);color:var(--text);border-radius:999px;padding:5px 12px;font-size:13px;cursor:pointer}.bubble-toggle:active{background:#ffffff1f}.center{display:flex;align-items:center;justify-content:center}@keyframes caret-blink{0%,to{opacity:1}50%{opacity:0}}.caret{animation:caret-blink 1s step-end infinite}.waveform{display:flex;align-items:center;justify-content:center;gap:3px;height:44px}.waveform-bar{width:3px;border-radius:3px;background:var(--primary);transition:height 60ms linear}.transcribing-row{display:flex;align-items:center;gap:8px;color:var(--primary-dark);font-size:15px}@keyframes spin{to{transform:rotate(360deg)}}.spinner{width:16px;height:16px;border:2px solid var(--ring);border-top-color:var(--primary);border-radius:50%;animation:spin .7s linear infinite}@keyframes ptt-pulse{0%{box-shadow:0 0 #ff7a4580}to{box-shadow:0 0 0 18px #ff7a4500}}.ptt-btn.recording{background:var(--primary-dark);animation:ptt-pulse 1.2s ease-out infinite}.bubble-row{position:relative;display:flex;margin:8px 0}.bubble-row.ai{justify-content:flex-start}.bubble-row.student{justify-content:flex-end}.bubble{position:relative;max-width:78%;padding:10px 14px;border-radius:16px;box-shadow:0 1px 4px #0000002e}.bubble.ai{background:#ffffff14;border:1px solid var(--card-border);color:var(--text)}.bubble.student{background:var(--primary);color:#fff}.replay-btn{position:absolute;right:4px;bottom:-12px;width:22px;height:22px;padding:0;border:none;border-radius:50%;background:#2a2c36;color:var(--primary-dark);font-size:10px;line-height:22px;text-align:center;cursor:pointer;box-shadow:0 1px 4px #0006;opacity:0;transition:opacity .15s ease}.bubble-row:hover .replay-btn,.replay-btn:focus-visible{opacity:1}.voice-stage{flex:none;height:100vh;height:100dvh;display:flex;flex-direction:column;min-height:0;overflow:hidden;position:relative}.voice-topbar{flex-shrink:0;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 14px}.voice-complete-banner{flex-shrink:0;display:flex;align-items:center;justify-content:space-between;gap:12px;margin:0 14px;padding:10px 14px;border-radius:14px;background:#ff7a4524;border:1px solid var(--ring);color:var(--primary-dark);font-weight:600}.banner-exit-btn{flex-shrink:0;padding:6px 14px;border:none;border-radius:999px;background:var(--primary-dark);color:#fff;font-size:13px;font-weight:600;white-space:nowrap;cursor:pointer}.voice-chunks{flex-shrink:0;padding:4px 16px 8px}.voice-caption{flex:1;display:flex;flex-direction:column;align-items:center;gap:28px;padding:24px 24px 8px;min-height:0;overflow-y:auto;text-align:center;mask-image:linear-gradient(to bottom,transparent 0,#000 72px);-webkit-mask-image:linear-gradient(to bottom,transparent 0,#000 72px)}.voice-caption>:first-child{margin-top:auto}.voice-msg{max-width:28ch;word-break:break-word;margin:0;transition:opacity .3s ease;font-size:25px;line-height:1.45;font-weight:600;text-shadow:0 2px 14px rgba(0,0,0,.5)}.voice-msg.ai{color:#fff}.voice-msg.student{color:var(--primary-dark)}.voice-caption-hint{font-size:16px;color:var(--muted);max-width:26ch}.voice-status{flex-shrink:0;height:64px;display:flex;align-items:center;justify-content:center;padding:4px 16px;overflow:hidden}.voice-status-pill{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border-radius:999px;background:#ffffff14;border:1px solid var(--card-border);color:var(--muted);font-size:16px}.voice-draft-bar{flex-shrink:0;margin:0 14px;max-height:4.6em;overflow-y:auto;padding:8px 14px;border-radius:14px;background:#ffffff0f;border:1px solid var(--card-border);color:var(--primary-dark);font-size:17px;line-height:1.5;font-weight:600;text-align:left;white-space:pre-wrap;word-break:break-word;animation:draftPulse 1.4s ease-in-out infinite}.voice-draft-bar:after{content:"";display:inline-block;width:2px;height:1em;margin-left:3px;vertical-align:-.15em;background:currentColor;animation:draftCaret 1s step-end infinite}@keyframes draftPulse{0%,to{opacity:.6}50%{opacity:.92}}@keyframes draftCaret{0%,to{opacity:1}50%{opacity:0}}.voice-transcript-overlay{position:absolute;top:0;right:0;bottom:0;left:0;z-index:5;background:#0a0b10d1;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);display:flex;flex-direction:column;padding:16px}.voice-transcript-scroll{flex:1;overflow-y:auto;padding:4px}.voice-controls{flex-shrink:0;padding:8px 16px 24px;display:flex;flex-direction:column;align-items:center;gap:14px}.voice-hint{font-size:14px;color:var(--muted);text-align:center;min-height:20px}.voice-ctrl-row{display:flex;align-items:center;justify-content:center;gap:36px}.voice-ctrl{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:none;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;color:#fff;-webkit-user-select:none;user-select:none;touch-action:none;transition:transform .1s ease,background .15s ease}.voice-ctrl:disabled{opacity:.4;cursor:default;pointer-events:none}.voice-ctrl:active{transform:scale(.94)}.voice-ctrl.mic{width:84px;height:84px;font-size:34px;background:var(--primary);box-shadow:0 8px 28px #ff7a4566}.voice-ctrl.mic:active{background:var(--primary-dark)}.voice-ctrl.mic.recording{background:var(--primary-dark);animation:ptt-pulse 1.2s ease-out infinite}.voice-ctrl.transcript,.voice-ctrl.exit{width:56px;height:56px;font-size:22px;background:#ffffff14;border:1px solid var(--card-border)}.voice-ctrl.transcript:active{background:#ffffff29}.voice-ctrl.exit{background:#ff3b3029;border-color:#ff3b3066;color:var(--red)}.voice-ctrl.exit:active{background:#ff3b3047}