:root{--ink:#18211d;--muted:#6f7a73;--paper:#f4f3ed;--surface:#fffef9;--sage:#d8e5dc;--green:#235c47;--green-dark:#153f31;--line:#dfe3dc;--coral:#e87859;--danger:#b73d2f}
*{box-sizing:border-box}html{background:var(--paper)}body{margin:0;background:radial-gradient(circle at 15% -10%,rgba(216,229,220,.9),transparent 36rem),var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}button,input,select{font:inherit}button{cursor:pointer;-webkit-tap-highlight-color:transparent}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid rgba(232,120,89,.45);outline-offset:2px}button:active{transform:scale(.98)}button:disabled{cursor:not-allowed;opacity:.36}[hidden]{display:none!important}
.app-shell{width:min(100%,760px);min-height:100svh;margin:0 auto;padding:max(22px,env(safe-area-inset-top)) 20px max(34px,env(safe-area-inset-bottom))}.topbar,.lesson-heading,.transport,.speed-row,.toolbar{display:flex;align-items:center}.topbar{gap:12px}.topbar h1{margin:1px 0 0;font-size:19px;letter-spacing:-.02em}.brand-mark{display:grid;width:44px;height:44px;flex:0 0 auto;place-items:center;border-radius:14px 14px 14px 4px;background:var(--green);color:#fff;font-family:Georgia,serif;font-size:25px;font-style:italic}.eyebrow{margin:0;color:var(--muted);font-size:10px;font-weight:700;letter-spacing:.13em}.help-button{width:38px;height:38px;margin-left:auto;border:1px solid var(--line);border-radius:50%;background:rgba(255,255,255,.5);color:var(--green-dark);font-weight:800}.import-button{border:0;border-radius:999px;padding:11px 15px;background:var(--ink);color:#fff;font-weight:650}
.lesson-heading{justify-content:space-between;gap:12px;margin:42px 2px 16px}.lesson-heading h2{margin:7px 0 0;font-family:Georgia,"Songti SC",serif;font-size:clamp(28px,7vw,40px);font-weight:500;letter-spacing:-.035em}.lesson-select{display:block;max-width:min(68vw,520px);margin:5px 0 0 -4px;border:0;background:transparent;color:var(--ink);font-family:Georgia,"Songti SC",serif;font-size:clamp(26px,7vw,38px);letter-spacing:-.035em}.progress-label{flex:0 0 auto;color:var(--muted);font-size:13px}
.practice-card{padding:26px 22px 22px;border:1px solid rgba(35,92,71,.13);border-radius:30px;background:rgba(255,254,249,.94);box-shadow:0 22px 60px rgba(28,57,45,.1);text-align:center;transition:border-color .2s,box-shadow .2s}.practice-card.recording{border-color:rgba(232,120,89,.7);box-shadow:0 22px 60px rgba(232,120,89,.12)}.waveform{display:flex;height:76px;align-items:center;justify-content:center;gap:5px;margin-bottom:12px}.waveform span{width:4px;border-radius:5px;background:var(--green);opacity:.7}.recording .waveform span{background:var(--coral);animation:pulse-wave .8s ease-in-out infinite alternate}.recording .waveform span:nth-child(2n){animation-delay:-.4s}@keyframes pulse-wave{to{transform:scaleY(.5);opacity:.35}}.timecode{margin:0 0 14px;color:var(--muted);font-size:11px;font-variant-numeric:tabular-nums;letter-spacing:.08em}.sentence{max-width:620px;margin:0 auto;font-family:Georgia,serif;font-size:clamp(24px,6vw,36px);line-height:1.27;letter-spacing:-.025em}.translation{margin:14px 0 0;color:var(--muted);font-size:15px}.speed-row{justify-content:center;gap:6px;margin-top:28px}.speed{min-width:54px;border:0;border-radius:999px;padding:8px 10px;background:transparent;color:var(--muted)}.speed.active{background:var(--sage);color:var(--green-dark);font-weight:700}.transport{justify-content:center;gap:24px;margin:18px 0}.round,.play-button{border:0;border-radius:50%}.round{width:48px;height:48px;background:var(--sage);color:var(--green);font-size:34px}.play-button{width:76px;height:76px;padding-left:5px;background:var(--green);color:#fff;font-size:25px;box-shadow:0 12px 28px rgba(35,92,71,.25)}.record-button{width:100%;border:0;border-radius:17px;padding:16px 18px;background:var(--coral);color:#fff;font-weight:750}.recording-button{background:var(--danger)}.recording-result{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:12px;margin-top:14px;padding:12px 14px;border-radius:16px;background:var(--sage);color:var(--green-dark);font-size:13px;font-weight:700;text-align:left}.recording-result audio{width:100%;height:36px}.status{min-height:20px;margin:13px auto 2px;color:var(--muted);font-size:12px;text-align:center}.toolbar{justify-content:center;gap:8px;margin:10px 0 24px;flex-wrap:wrap}.toolbar button{border:1px solid var(--line);border-radius:999px;padding:9px 13px;background:rgba(255,255,255,.48);color:var(--ink);font-size:13px}.toolbar .tool-active{border-color:rgba(35,92,71,.22);background:var(--sage);color:var(--green-dark);font-weight:700}
.segment-list{display:grid;gap:9px;padding-bottom:18px}.segment{display:grid;grid-template-columns:36px 1fr;width:100%;min-height:48px;align-items:center;border:1px solid transparent;border-radius:16px;padding:14px;background:transparent;color:var(--ink);text-align:left}.segment span{color:var(--muted);font-size:12px;font-variant-numeric:tabular-nums}.segment p{margin:0;line-height:1.45}.active-segment{border-color:rgba(35,92,71,.15);background:rgba(216,229,220,.58)}
.modal-backdrop{position:fixed;z-index:10;inset:0;display:grid;place-items:end center;padding-top:env(safe-area-inset-top);background:rgba(20,31,26,.46);backdrop-filter:blur(8px)}.modal{position:relative;width:min(100%,620px);max-height:92svh;overflow-y:auto;border-radius:28px 28px 0 0;padding:30px max(20px,env(safe-area-inset-left)) max(28px,env(safe-area-inset-bottom));background:var(--surface);box-shadow:0 -24px 70px rgba(15,35,27,.2)}.modal h2{margin:7px 0 10px;font-family:Georgia,"Songti SC",serif;font-size:30px;font-weight:500}.modal-copy{margin:0 42px 24px 0;color:var(--muted);font-size:14px;line-height:1.65}.close-button{position:absolute;top:22px;right:20px;width:40px;height:40px;border:0;border-radius:50%;background:var(--sage);color:var(--green-dark);font-size:26px}.field-label{display:block;margin:0 0 7px;color:var(--muted);font-size:12px;font-weight:700}.text-input{width:100%;margin-bottom:12px;border:1px solid var(--line);border-radius:14px;padding:14px;background:#fff;color:var(--ink);font-size:16px}.file-picker{display:grid;grid-template-columns:42px 1fr;width:100%;align-items:center;gap:12px;margin-top:10px;border:1px solid var(--line);border-radius:16px;padding:13px;background:#fff;color:var(--ink);text-align:left}.file-picker>span{display:grid;width:38px;height:38px;place-items:center;border-radius:12px;background:var(--sage);color:var(--green-dark);font-weight:800}.file-picker b,.file-picker small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-picker small{margin-top:3px;color:var(--muted)}.save-button{width:100%;margin-top:18px;border:0;border-radius:16px;padding:16px;background:var(--green);color:#fff;font-weight:750}.privacy-note{margin:13px 0 0;color:var(--muted);font-size:12px;line-height:1.5;text-align:center}.error{min-height:18px;margin:13px 0 0;color:var(--danger);font-size:13px}.steps{display:grid;gap:12px;margin:22px 0;padding:0;list-style:none}.steps li{display:grid;grid-template-columns:36px 1fr;align-items:start;gap:12px}.steps li>span{display:grid;width:32px;height:32px;place-items:center;border-radius:10px;background:var(--sage);color:var(--green-dark);font-weight:800}.steps p{margin:5px 0 0;line-height:1.5}
@media(min-width:621px){.modal-backdrop{place-items:center;padding:24px}.modal{border-radius:28px}}@media(max-width:480px){.app-shell{padding-inline:14px}.practice-card{padding-inline:17px;border-radius:26px}.lesson-heading{margin-top:34px}.progress-label{font-size:12px}.topbar{gap:8px}.topbar h1{font-size:17px}.brand-mark{width:40px;height:40px}.help-button{width:36px;height:36px}.import-button{padding:10px 12px;font-size:13px}.recording-result{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}}