@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;500;600;700;800&display=swap');
:root{--bg:#f5f6f1;--paper:#fff;--ink:#263d33;--muted:#7a847c;--green:#375844;--lime:#d7eeac;--line:#e4e8df}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:'Be Vietnam Pro',system-ui,sans-serif;font-size:14px}button,input,select{font:inherit}button,a,input,select{ -webkit-tap-highlight-color:transparent}button{cursor:pointer;border:1px solid var(--line);border-radius:9px;padding:9px 13px;background:white;color:var(--ink);transition:background .15s}button:hover{background:#eff4e8}button:disabled{opacity:.5;cursor:wait}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #97b966;outline-offset:3px}input{padding:13px;border:1px solid var(--line);border-radius:9px;min-width:0}a{color:inherit;text-decoration:none}[hidden]{display:none!important}header{max-width:1600px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:25px 4%;border-bottom:1px solid var(--line)}.brand{font-weight:800;font-size:30px;display:flex;align-items:center;gap:8px;letter-spacing:-1.5px}.brand-icon{display:inline-grid;place-items:center;background:var(--green);color:var(--lime);width:33px;height:33px;font-size:16px;border-radius:10px;letter-spacing:0}.brand-dot,.green{color:#7ca65b}.header-note{color:var(--muted);font-size:12px}.header-actions{display:flex;gap:10px}.header-actions button{background:transparent;border-color:transparent;font-size:12px}main{max-width:1600px;margin:auto;padding:0 4%}.intro{display:flex;justify-content:space-between;align-items:center;padding:38px 0 25px}.eyebrow{font-size:10px;font-weight:700;letter-spacing:2px;color:#7b8b6c}h1{font-size:clamp(26px,3vw,42px);line-height:1.35;font-weight:600;letter-spacing:-1.4px;margin:12px 0 16px}.intro p:not(.eyebrow){color:var(--muted);line-height:1.8;font-size:13px}.intro-stamp{border:1px solid #c9d6bd;border-radius:50%;height:106px;width:106px;transform:rotate(12deg);display:flex;flex-direction:column;justify-content:center;align-items:center;font-size:20px;font-weight:700;line-height:1.15;color:#779362;margin-right:22px}.intro-stamp span{font-size:14px;font-weight:400}.add-form{display:flex;align-items:center;gap:15px;padding:9px 10px 9px 20px;border:1px solid var(--line);background:white;border-radius:13px;box-shadow:0 4px 12px #293d3104}.add-form input{flex:1;border:none;background:none;padding:11px 0}.link-icon{font-size:25px;color:#9ba88e}.primary{background:var(--green);color:white;border-color:var(--green);padding:13px 20px}.primary:hover{background:#284734}.primary span{padding-left:10px}#notice{font-size:12px;min-height:15px;color:#91632c;margin:10px 0}.workspace{display:grid;grid-template-columns:245px minmax(0,1fr);gap:25px;align-items:start;margin:25px 0 45px}aside{padding-right:22px;border-right:1px solid var(--line);min-height:500px}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:10px}h2{font-size:16px;font-weight:600;margin:8px 0}h3{font-size:14px;font-weight:600}.badge{background:#e9eee2;color:#799064;display:inline-block;font-size:10px;border-radius:6px;padding:4px 7px;font-weight:500}.small{font-size:11px;line-height:1.8}.muted{color:var(--muted)}#library{margin-top:20px;display:grid;gap:12px}.video-card{width:100%;text-align:left;padding:8px;border:1px solid transparent;background:transparent;border-radius:11px;display:grid;grid-template-columns:72px 1fr;gap:10px}.video-card.selected{background:#e9eedd;border-color:#d8e1ca}.video-card img{width:72px;height:48px;object-fit:cover;border-radius:6px}.video-card strong{font-size:11px;line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;font-weight:500}.video-card small{display:block;font-size:9px;color:var(--muted);margin-top:5px}.video-card progress{width:100%;height:3px;accent-color:#83a85b;border:none;display:block;margin-top:8px}.lesson{min-width:0}.empty{border:1px dashed #d8dfce;border-radius:15px;min-height:475px;display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center;padding:25px}.empty h2{font-size:20px;max-width:420px;line-height:1.6}.empty p{font-size:12px;color:var(--muted);line-height:2}.empty-icon{font-size:45px;background:#e8eddf;color:#809464;width:90px;height:90px;display:grid;place-items:center;border-radius:27px;margin-bottom:20px}.mini-tag{font-size:9px;letter-spacing:2px;margin-top:30px;color:#94a185}.lesson-title{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:18px}.lesson-title h2{line-height:1.6;font-size:17px;margin-top:8px}.lesson-title .eyebrow{font-size:9px}.study-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:22px}.player-column{min-width:0}.player-shell{position:relative;aspect-ratio:16/9;background:#19271f;border-radius:12px;overflow:hidden}.player-shell iframe{width:100%;height:100%;position:absolute;inset:0;border:0}.playback-tools{display:flex;gap:8px;align-items:center;justify-content:flex-end;margin:12px 0}.playback-tools label{margin-right:auto;color:var(--muted);font-size:11px}.playback-tools select{margin-left:6px;padding:7px 5px;border:1px solid var(--line);border-radius:7px;background:white;color:var(--ink)}.playback-tools button{padding:7px 13px}.practice-card{padding:22px;background:#edf0e5;border:1px solid #e3e8d8;border-radius:12px;margin-top:20px}.practice-card p{font-size:11px;color:var(--muted);line-height:1.9}.practice-card .eyebrow{font-size:9px}.toggle{display:flex;gap:8px;align-items:center;font-size:11px;margin-top:15px;line-height:1.6}.toggle input{accent-color:var(--green)}.transcript-column{border:1px solid var(--line);border-radius:12px;background:white;overflow:hidden;min-width:0}.transcript-header{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;border-bottom:1px solid var(--line);gap:4px}.transcript-header h3{font-size:12px;white-space:nowrap}.transcript-header button{font-size:10px;padding:6px 8px;border:0;background:transparent}.transcript-header button[aria-pressed=true]{color:#57883e}.transcript-header>div{display:flex}#transcript{height:520px;overflow-y:auto;scroll-behavior:smooth;scrollbar-width:thin;scrollbar-color:#d5dfcb transparent}.sentence{display:grid;grid-template-columns:43px minmax(0,1fr) 22px;gap:8px;padding:16px 12px;border-bottom:1px solid #eff1eb;position:relative}.sentence.active{background:#f0f5e6;box-shadow:inset 3px 0 #86a858}.sentence .seek{border:none;background:none;padding:0;font-size:10px;color:#8c9b7c;align-self:start;line-height:1.9;font-variant-numeric:tabular-nums}.sentence .text{border:0;background:none;text-align:left;padding:0;line-height:1.8;font-size:12px;width:100%;color:#334439}.sentence .vi{font-size:11px;color:#839078;margin-top:6px;line-height:1.8}.sentence .star{border:0;background:none;padding:0;color:#a5ae99;font-size:19px;align-self:start}.sentence .star.saved{color:#9caa38}.hide-vi .vi{display:none}.transcript-footer{display:flex;align-items:center;gap:6px;border-top:1px solid var(--line);padding:12px;font-size:9px;color:#8b9683}.dot{background:#9ab577;width:5px;height:5px;border-radius:50%}#progress-label{margin-left:auto;font-variant-numeric:tabular-nums}#processing{font-size:11px;line-height:1.9;background:#f5f4e9;color:#8a784a;padding:12px 15px}#processing:empty{display:none}footer{display:flex;align-items:center;justify-content:space-between;color:#97a08e;font-size:10px;border-top:1px solid var(--line);padding:22px 0 30px}footer .brand{font-size:19px}.auth{min-height:100vh;display:grid;place-items:center;padding:25px;background:radial-gradient(ellipse at top right,#e1edcd,transparent 60%)}.auth-card{max-width:430px;width:100%;padding:35px;border:1px solid var(--line);background:#ffffffbb;border-radius:20px}.auth-card .eyebrow{margin-top:30px;font-size:9px}.auth-card h1{font-size:36px}.auth-card>p{line-height:1.8;color:var(--muted);font-size:12px}.auth-card form{display:grid;gap:12px;margin-top:30px}label{font-size:12px}#auth-error{color:#b2523a}dialog{border:1px solid var(--line);border-radius:16px;max-width:450px;width:calc(100% - 30px);padding:25px;background:var(--bg);color:var(--ink)}dialog::backdrop{background:#1c302888;backdrop-filter:blur(4px)}dialog form{display:grid;gap:12px}dialog p{font-size:12px;line-height:1.8;margin:0}#settings-form .primary{margin-top:10px}@media(min-width:1700px){.study-grid{gap:30px}}@media(max-width:1150px){.workspace{grid-template-columns:205px minmax(0,1fr);gap:18px}.study-grid{grid-template-columns:1fr}.practice-card{display:none}#transcript{height:420px}.player-column{position:sticky;top:0;z-index:2;background:var(--bg)}}@media(max-width:680px){header{padding:16px 5%}.brand{font-size:26px}.header-note{display:none}.header-actions{gap:0}.header-actions button{font-size:10px;padding:7px}main{padding:0 5%}.intro{padding:24px 0 15px}.intro h1{font-size:27px;letter-spacing:-.8px}.intro p:not(.eyebrow){font-size:11px}.intro-stamp{display:none}.eyebrow{font-size:8px;letter-spacing:1.5px}.add-form{gap:8px;padding:7px 8px 7px 12px}.add-form input{font-size:12px}.add-form button{padding:11px 12px;font-size:11px}.add-form button span{display:none}.link-icon{font-size:20px}.workspace{display:flex;flex-direction:column;gap:20px;margin-top:15px}aside{width:100%;min-height:0;padding:0 0 16px;border-right:0;border-bottom:1px solid var(--line)}aside>.muted{display:none}#library{display:flex;overflow-x:auto;gap:8px;margin-top:12px;padding-bottom:5px}.video-card{min-width:200px;width:200px;flex-shrink:0}.section-heading h2{font-size:13px}.lesson{width:100%}.lesson-title h2{font-size:15px}.empty{min-height:310px}.empty h2{font-size:17px}.empty-icon{width:65px;height:65px;font-size:35px}.study-grid{gap:12px}.player-column{top:0;padding-top:8px}.player-column>.small{display:none}.playback-tools{margin:8px 0}#transcript{height:470px}.sentence{padding:15px 12px}.sentence .text{font-size:13px}.sentence .vi{font-size:12px}.transcript-header{padding:8px 12px}footer{font-size:8px;gap:12px}footer>span:last-child{display:none}.auth-card{padding:25px}}
@media(max-width:1150px){.practice-card{display:block;padding:10px 13px;margin-top:8px}.practice-card>.eyebrow,.practice-card>h3,.practice-card>p{display:none}.practice-card .toggle{margin:6px 0}}@media(max-width:680px){.practice-card .toggle{font-size:10px}.practice-card{margin-bottom:4px}}