*,:before,:after{box-sizing:border-box}#root{min-height:100vh}:root{--paper:#f6f1e8;--paper-2:#efe8db;--paper-3:#e7dfce;--ink:#2a261f;--ink-2:#5a5246;--ink-3:#857b6a;--line:#d9cfba;--line-strong:#b8ac93;--accent:oklch(55% .12 45);--accent-2:oklch(55% .12 145);--accent-soft:oklch(92% .04 45);--error:oklch(55% .15 25);--good:oklch(52% .12 145);--serif:"Fraunces", "EB Garamond", Georgia, serif;--sans:"Inter", "Helvetica Neue", Arial, sans-serif;--tamil:"Noto Serif Tamil", "Latha", serif;--mono:"JetBrains Mono", "IBM Plex Mono", ui-monospace, monospace}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--paper);color:var(--ink);font-family:var(--sans);background-image:radial-gradient(1200px 600px at 20% -10%,#b4965a14,#0000 60%),radial-gradient(900px 500px at 110% 110%,#5a6e460f,#0000 60%);min-height:100vh;font-size:16px;line-height:1.5}.ta{font-family:var(--tamil)}.tp{font-family:var(--serif);letter-spacing:.01em;font-style:italic}.app{max-width:1080px;margin:0 auto;padding:28px 32px 120px}header.top{border-bottom:1px solid var(--line);justify-content:space-between;align-items:baseline;margin-bottom:28px;padding-bottom:18px;display:flex}.brand{font-family:var(--serif);letter-spacing:-.01em;font-size:26px;font-weight:600}.brand .dot{color:var(--accent)}.brand-sub{font-family:var(--tamil);color:var(--ink-2);margin-left:10px;font-size:14px}.top-meta{color:var(--ink-2);align-items:center;gap:18px;font-size:13px;display:flex}nav.tabs{border-bottom:1px solid var(--line);gap:4px;margin-bottom:28px;display:flex}nav.tabs button{font-family:var(--sans);color:var(--ink-2);cursor:pointer;background:0 0;border:none;border-bottom:2px solid #0000;margin-bottom:-1px;padding:10px 16px;font-size:14px;transition:color .15s}nav.tabs button:hover{color:var(--ink)}nav.tabs button.active{color:var(--ink);border-bottom-color:var(--accent);font-weight:500}.hero{margin-bottom:36px}.hero h1{font-family:var(--serif);letter-spacing:-.02em;margin:0 0 12px;font-size:42px;font-weight:500;line-height:1.1}.hero h1 em{color:var(--accent);font-style:italic}.hero p{max-width:640px;color:var(--ink-2);margin:0;font-size:15px}.hero .ta-sub{font-family:var(--tamil);color:var(--ink-2);margin-top:6px;font-size:16px}.chapters{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin-top:24px;display:grid}.chapter{background:var(--paper-2);border:1px solid var(--line);cursor:pointer;border-radius:6px;flex-direction:column;justify-content:space-between;min-height:138px;padding:18px 18px 16px;transition:transform .1s,border-color .15s,background .15s;display:flex;position:relative}.chapter:hover{border-color:var(--line-strong);transform:translateY(-1px)}.chapter.locked{opacity:.5;cursor:not-allowed}.chapter.locked:hover{border-color:var(--line);transform:none}.chapter.done{background:var(--accent-soft);border-color:var(--accent)}.chapter .num{font-family:var(--mono);color:var(--ink-3);letter-spacing:.1em;text-transform:uppercase;font-size:11px}.chapter.done .num{color:var(--accent)}.chapter h3{font-family:var(--serif);margin:6px 0 2px;font-size:20px;font-style:italic;font-weight:500}.chapter .title-ta{font-family:var(--tamil);color:var(--ink-2);margin-bottom:10px;font-size:14px}.chapter .meta{color:var(--ink-3);justify-content:space-between;align-items:center;font-size:12px;display:flex}.chapter .check{border:1px solid var(--line-strong);background:var(--paper);border-radius:50%;width:18px;height:18px;position:absolute;top:14px;right:14px}.chapter.done .check{background:var(--accent);border-color:var(--accent)}.chapter.done .check:after{content:"";border-right:2px solid var(--paper);border-bottom:2px solid var(--paper);width:5px;height:9px;margin:2px auto 0;display:block;transform:rotate(45deg)}.backlink{color:var(--ink-2);cursor:pointer;font-size:13px;font-family:var(--sans);background:0 0;border:none;margin-bottom:20px;padding:0}.backlink:hover{color:var(--ink)}.chapter-head{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:10px;margin-bottom:8px;display:flex}.chapter-head h2{font-family:var(--serif);letter-spacing:-.01em;margin:0;font-size:34px;font-style:italic;font-weight:500}.chapter-head .num-label{font-family:var(--mono);color:var(--ink-3);letter-spacing:.1em;text-transform:uppercase;margin-right:12px;font-size:11px}.chapter-summary{color:var(--ink-2);margin:0 0 4px;font-size:14px}.chapter-summary-ta{font-family:var(--tamil);color:var(--ink);margin:0 0 24px;font-size:15px}.mode-bar{flex-wrap:wrap;gap:10px;margin:28px 0 20px;display:flex}.mode-btn{background:var(--paper);border:1px solid var(--line);cursor:pointer;font-family:var(--sans);color:var(--ink);border-radius:6px;flex-direction:column;align-items:flex-start;gap:2px;min-width:170px;padding:12px 18px;font-size:14px;transition:border-color .15s,background .15s;display:flex}.mode-btn:hover{border-color:var(--accent)}.mode-btn .mb-ta{font-family:var(--tamil);color:var(--ink-3);font-size:12px}.mode-btn.primary{background:var(--ink);color:var(--paper);border-color:var(--ink)}.mode-btn.primary .mb-ta{color:var(--line)}.word-list{border-top:1px solid var(--line)}.word-row{border-bottom:1px solid var(--line);grid-template-columns:120px 1fr 80px;align-items:baseline;gap:18px;padding:14px 0;display:grid}.word-row .wr-tp{font-family:var(--serif);color:var(--ink);font-size:20px;font-style:italic}.word-row .wr-ta{font-family:var(--tamil);color:var(--ink);font-size:16px;line-height:1.4}.word-row .wr-notes{color:var(--ink-3);margin-top:2px;font-size:12px}.word-row .wr-pos{font-family:var(--mono);color:var(--ink-3);letter-spacing:.1em;text-transform:uppercase;text-align:right;font-size:10px}.word-row .wr-example{border-left:2px solid var(--line);color:var(--ink-2);margin-top:6px;padding-left:10px;font-size:13px}.word-row .wr-example .tp{font-size:14px}.word-row .wr-example .ta{margin-top:2px}.mark-done-bar{background:var(--paper-2);border:1px solid var(--line);border-radius:6px;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:14px;margin-top:36px;padding:18px 20px;display:flex}.mark-done-bar p{color:var(--ink-2);max-width:520px;margin:0;font-size:14px}.mark-done-bar p .ta-inline{font-family:var(--tamil);color:var(--ink-3);margin-top:2px;font-size:13px;display:block}.lesson-body,.grammar-body{margin-top:28px}.lesson-section{border:1px solid var(--line);background:#ffffff59;border-radius:4px;margin-bottom:14px;padding:18px 20px}.lesson-section h4{font-family:var(--serif);color:var(--ink);margin:0 0 10px;font-size:17px;font-weight:500}.lesson-heading-ta{font-family:var(--tamil);color:var(--ink-3);margin-left:10px;font-size:14px;font-weight:400}.lesson-section p{color:var(--ink-2);margin:0 0 8px;font-size:14px;line-height:1.6}.lesson-section p.ta{font-family:var(--tamil);color:var(--ink-2);border-top:1px dashed var(--line);margin-bottom:0;padding-top:8px;font-size:15px}button.primary,button.ghost{font-family:var(--sans);cursor:pointer;border-radius:6px;padding:10px 18px;font-size:14px;transition:background .15s,border-color .15s,color .15s}button.primary{background:var(--ink);color:var(--paper);border:1px solid var(--ink)}button.primary:hover{background:var(--accent);border-color:var(--accent)}button.primary.done{background:var(--good);border-color:var(--good)}button.ghost{color:var(--ink);border:1px solid var(--line-strong);background:0 0}button.ghost:hover{background:var(--paper-2)}.session{max-width:640px;margin:0 auto}.session-head{color:var(--ink-2);justify-content:space-between;align-items:baseline;margin-bottom:20px;font-size:13px;display:flex}.progress-bar{background:var(--line);border-radius:2px;height:3px;margin-bottom:30px;overflow:hidden}.progress-fill{background:var(--accent);height:100%;transition:width .3s}.flashcard{background:var(--paper-2);border:1px solid var(--line);text-align:center;-webkit-user-select:none;user-select:none;cursor:pointer;border-radius:8px;flex-direction:column;justify-content:center;align-items:center;min-height:320px;padding:48px 36px;display:flex;position:relative;box-shadow:0 1px #0000000a,0 8px 24px -16px #00000026}.flashcard .corner{font-family:var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);font-size:10px;position:absolute;top:14px;left:16px}.flashcard .hint{font-family:var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3);font-size:10px;position:absolute;bottom:14px}.flashcard .face-primary{letter-spacing:-.02em;margin-bottom:10px;font-size:56px;font-weight:500;line-height:1.1}.flashcard .face-primary.tp{font-family:var(--serif);font-style:italic}.flashcard .face-primary.ta{font-family:var(--tamil);font-size:42px;font-style:normal}.flashcard .face-secondary{color:var(--ink-2);font-size:14px}.flashcard hr{border:none;border-top:1px dashed var(--line-strong);width:60px;margin:22px 0}.flashcard .back-primary{margin-bottom:8px;font-size:32px;line-height:1.25}.flashcard .back-primary.ta{font-family:var(--tamil)}.flashcard .back-primary.tp{font-family:var(--serif);font-style:italic}.flashcard .back-notes{color:var(--ink-3);font-size:13px;font-family:var(--mono);letter-spacing:.05em;margin-top:6px}.flashcard .ex{border-top:1px solid var(--line);width:100%;max-width:360px;color:var(--ink-2);margin-top:18px;padding-top:14px;font-size:14px}.flashcard .ex .tp{font-size:15px}.flashcard .ex .ta{margin-top:3px;font-size:14px}.srs-buttons{grid-template-columns:1fr 1fr 1fr;gap:8px;margin-top:20px;display:grid}.srs-btn{border:1px solid var(--line-strong);background:var(--paper);cursor:pointer;font-family:var(--sans);color:var(--ink);border-radius:6px;flex-direction:column;align-items:center;gap:2px;padding:14px 8px;font-size:13px;transition:background .15s,border-color .15s;display:flex}.srs-btn:hover{background:var(--paper-2)}.srs-btn b{font-size:15px;font-weight:500}.srs-btn .due{font-family:var(--mono);color:var(--ink-3);letter-spacing:.05em;font-size:10px}.srs-btn.again:hover{border-color:var(--error);color:var(--error)}.srs-btn.hard:hover{border-color:var(--accent)}.srs-btn.good:hover{border-color:var(--good);color:var(--good)}.reveal-btn{background:var(--paper);border:1px solid var(--line-strong);font-family:var(--sans);cursor:pointer;color:var(--ink);border-radius:6px;margin-top:18px;padding:12px 28px;font-size:14px}.reveal-btn:hover{background:var(--paper-2);border-color:var(--ink-3)}.quiz{max-width:680px;margin:0 auto}.quiz .prompt{background:var(--paper-2);border:1px solid var(--line);border-radius:8px;margin-bottom:18px;padding:32px 28px}.quiz .prompt .label{font-family:var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3);margin-bottom:12px;font-size:10px}.quiz .prompt .sentence{font-size:30px;font-weight:500;line-height:1.25}.quiz .prompt .sentence.tp{font-family:var(--serif);font-style:italic}.quiz .prompt .sentence.ta{font-family:var(--tamil);font-size:26px;font-style:normal}.quiz textarea{border:1px solid var(--line-strong);background:var(--paper);width:100%;min-height:90px;font-family:var(--tamil);resize:vertical;color:var(--ink);border-radius:6px;padding:14px 16px;font-size:18px}.quiz textarea.tp-input{font-family:var(--serif);font-style:italic}.quiz textarea:focus{border-color:var(--accent);outline:none}.quiz .feedback{border:1px solid var(--line);background:var(--paper-2);border-radius:6px;margin-top:16px;padding:16px 18px}.quiz .feedback .label{font-family:var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3);margin-bottom:6px;font-size:10px}.quiz .feedback .answer{font-size:20px;line-height:1.3}.quiz .feedback .answer.tp{font-family:var(--serif);font-style:italic}.quiz .feedback .answer.ta{font-family:var(--tamil)}.quiz-actions{justify-content:flex-end;gap:10px;margin-top:18px;display:flex}.dict-search{border:1px solid var(--line-strong);background:var(--paper);width:100%;max-width:420px;font-family:var(--sans);border-radius:6px;margin-bottom:20px;padding:12px 16px;font-size:14px}.dict-search:focus{border-color:var(--accent);outline:none}.dict-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:10px;display:grid}.dict-entry{border:1px solid var(--line);background:var(--paper-2);border-radius:6px;padding:14px 16px}.dict-entry .de-head{justify-content:space-between;align-items:baseline;gap:8px;display:flex}.dict-entry .de-tp{font-family:var(--serif);font-size:20px;font-style:italic}.dict-entry .de-pos{font-family:var(--mono);color:var(--ink-3);letter-spacing:.1em;text-transform:uppercase;font-size:9px}.dict-entry .de-ta{font-family:var(--tamil);color:var(--ink);margin-top:4px;font-size:15px}.dict-entry .de-notes{color:var(--ink-3);margin-top:3px;font-size:12px}.dict-entry .de-chap{font-family:var(--mono);color:var(--ink-3);letter-spacing:.08em;text-transform:uppercase;margin-top:6px;font-size:9px}.idiom-list{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:12px;display:grid}.idiom{background:var(--paper-2);border:1px solid var(--line);border-radius:6px;padding:18px 20px}.idiom .id-tp{font-family:var(--serif);margin-bottom:6px;font-size:22px;font-style:italic}.idiom .id-ta{font-family:var(--tamil);color:var(--ink);margin-bottom:8px;font-size:17px}.idiom .id-note{color:var(--ink-3);border-top:1px solid var(--line);padding-top:8px;font-size:12px}.empty{text-align:center;color:var(--ink-2);padding:80px 20px}.empty h3{font-family:var(--serif);margin:0 0 8px;font-size:22px;font-weight:500}.empty p{margin:0 0 4px;font-size:14px}.empty .ta{font-family:var(--tamil);color:var(--ink-3);font-size:14px}footer.foot{border-top:1px solid var(--line);color:var(--ink-3);font-size:12px;font-family:var(--mono);letter-spacing:.03em;justify-content:space-between;margin-top:80px;padding-top:20px;display:flex}.summary{text-align:center;background:var(--paper-2);border:1px solid var(--line);border-radius:8px;max-width:520px;margin:40px auto;padding:40px 30px}.summary h2{font-family:var(--serif);margin:0 0 6px;font-size:32px;font-style:italic;font-weight:500}.summary .ta{font-family:var(--tamil);color:var(--ink-2);font-size:15px}.summary .stats{justify-content:center;gap:28px;margin:28px 0;display:flex}.summary .stat{text-align:center}.summary .stat b{font-family:var(--serif);font-size:34px;font-weight:500;display:block}.summary .stat span{color:var(--ink-3);text-transform:uppercase;letter-spacing:.08em;font-size:12px;font-family:var(--mono)}.summary .stat.good b{color:var(--good)}.summary .stat.bad b{color:var(--error)}kbd{font-family:var(--mono);border:1px solid var(--line-strong);background:var(--paper);color:var(--ink-2);border-radius:3px;padding:1px 5px;font-size:10px}@media (width<=640px){.app{padding:16px 14px 80px}header.top{flex-direction:column;align-items:flex-start;gap:10px;margin-bottom:18px;padding-bottom:14px}.brand{font-size:22px}.brand-sub{margin-left:0;display:block}.top-meta{flex-wrap:wrap;gap:12px}nav.tabs{-webkit-overflow-scrolling:touch;scrollbar-width:none;gap:0;margin-bottom:20px;overflow-x:auto;-webkit-mask-image:linear-gradient(90deg,#000 80%,#0000 100%);mask-image:linear-gradient(90deg,#000 80%,#0000 100%)}nav.tabs::-webkit-scrollbar{display:none}nav.tabs button{white-space:nowrap;flex-shrink:0;padding:10px;font-size:12px}.hero{margin-bottom:24px}.hero h1{font-size:30px}.hero p{font-size:14px}.hero .ta-sub{font-size:15px}.chapters{grid-template-columns:1fr;gap:10px}.chapter{min-height:110px;padding:14px 14px 12px}.chapter h3{font-size:18px}.chapter .title-ta{font-size:13px}.chapter-head h2{font-size:26px}.chapter-summary-ta{margin-bottom:16px;font-size:14px}.mode-bar{gap:8px;margin:20px 0 16px}.mode-btn{flex:calc(50% - 4px);min-width:0;padding:10px 14px;font-size:13px}.mode-btn .mb-ta{font-size:11px}.lesson-section{padding:14px 16px}.lesson-section h4{font-size:15px}.lesson-section p{font-size:13px}.lesson-section p.ta{font-size:14px}.word-row{grid-template-columns:1fr;gap:6px;padding:12px 0}.word-row .wr-pos{text-align:left;font-size:9px}.word-row .wr-tp{font-size:18px}.word-row .wr-ta{font-size:15px}.flashcard{min-height:260px;padding:32px 18px}.flashcard .face-primary{font-size:40px}.flashcard .face-primary.ta{font-size:28px}.flashcard .back-primary{font-size:24px}.srs-buttons{gap:6px}.srs-btn{padding:12px 4px;font-size:12px}.srs-btn b{font-size:14px}.quiz .prompt{padding:20px 16px}.quiz .prompt .sentence{font-size:22px}.quiz .prompt .sentence.ta{font-size:20px}.quiz textarea{font-size:16px}.quiz-actions{flex-wrap:wrap}.quiz-actions button{flex:1}.dict-grid,.idiom-list{grid-template-columns:1fr;gap:8px}.dict-entry,.idiom{padding:12px 14px}.mark-done-bar{flex-direction:column;align-items:stretch;gap:12px;padding:14px 16px}.mark-done-bar button{width:100%}.summary{margin:20px auto;padding:28px 20px}.summary h2{font-size:24px}.summary .stats{gap:18px}.summary .stat b{font-size:26px}footer.foot{flex-direction:column;gap:4px;font-size:11px}}@media (width<=380px){.srs-buttons{grid-template-columns:1fr}.mode-btn{flex-basis:100%}}