@font-face{font-family:Word;src:url('/assets/word-bold.ttf') format('truetype');font-weight:700;font-display:swap}
:root{--accent:#7162a4;--accent-dark:#55447f;--tint:#f0ecf8;--paper:#fffefa;--background:#f6f4f0;--ink:#302936;--muted:#706675;--line:#e6e0e8;--radius:14px}
*{box-sizing:border-box}body{margin:0;background:var(--background);color:var(--ink);font:16px/1.5 system-ui,-apple-system,'Noto Sans CJK SC','Microsoft YaHei',sans-serif}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;border:0}button:disabled{opacity:.4;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #b4a0dc;outline-offset:3px}::selection{background:#dcd0f1;color:#302936}*{scrollbar-color:#c8bfd4 transparent;scrollbar-width:thin}button svg{width:20px;height:20px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}a{color:var(--accent-dark);text-underline-offset:3px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}[hidden]{display:none!important}
.app-header{height:76px;background:var(--paper);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 36px;position:sticky;top:0;z-index:20}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font-size:22px;font-weight:700;letter-spacing:.5px}.brand svg{width:32px;height:32px;fill:none;stroke:var(--accent);stroke-width:2;stroke-linejoin:round}.header-actions{display:flex;align-items:center;gap:12px}.subtle{background:transparent;color:var(--accent-dark);border:1px solid #d8cfe3;border-radius:10px;padding:9px 15px;min-height:44px}.subtle:hover{background:var(--tint)}.icon-button{width:44px;height:44px;border-radius:10px;display:grid;place-items:center;background:var(--tint);color:var(--accent-dark)}.icon-button svg rect{fill:currentColor;stroke:none}#menu-toggle{display:none}
.layout{max-width:1440px;margin:0 auto;display:grid;grid-template-columns:280px minmax(0,1fr);min-height:calc(100vh - 76px)}.course-nav{padding:26px 20px 24px;border-right:1px solid var(--line);position:sticky;top:76px;max-height:calc(100dvh - 76px);overflow:auto;background:var(--background)}.nav-search{position:relative}.nav-search svg{position:absolute;width:18px;height:18px;left:12px;top:13px;stroke:var(--muted);fill:none;stroke-width:1.8}.nav-search input{width:100%;background:var(--paper);border:1px solid var(--line);border-radius:10px;height:44px;padding:8px 10px 8px 36px;font-size:14px;color:var(--ink);caret-color:var(--accent)}input::placeholder{color:var(--muted)}.nav-tabs{display:flex;border-bottom:1px solid var(--line);margin:18px 0 12px;gap:16px}.nav-tabs button{background:none;color:var(--muted);font-weight:600;padding:9px 12px;border-bottom:2px solid transparent}.nav-tabs button[aria-pressed=true]{color:var(--accent-dark);border-color:var(--accent)}.unit{margin-bottom:6px}.unit summary{font-size:13px;color:#62556b;cursor:pointer;padding:11px 4px;font-weight:600}.lesson-link{display:flex;align-items:center;gap:9px;width:100%;padding:9px 11px;text-align:left;border-radius:8px;background:none;color:var(--ink);font-size:14px;min-height:40px}.lesson-link:hover{background:#eeE9f1}.lesson-link[aria-current=true]{background:#e7dff2;color:#4f3e78;font-weight:650}.lesson-no{color:#776a85;font-size:11px;width:24px;flex-shrink:0;font-variant-numeric:tabular-nums}.sources-link{background:none;color:var(--muted);font-size:12px;padding:16px 6px 6px}#sources{font-size:12px;color:var(--muted);padding:6px;line-height:1.6}#sources a{color:var(--muted)}.empty-search{font-size:14px;color:var(--muted);padding:16px 4px}
main{min-width:0;padding:36px clamp(24px,4vw,64px) 48px}.lesson-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:26px}#unit-name{color:var(--muted);font-size:14px;margin:0 0 5px}h1{margin:0;font-size:clamp(25px,3.5vw,38px);line-height:1.25;font-weight:700;max-width:620px;text-wrap:balance}.lesson-controls{display:flex;align-items:center;gap:14px;flex-shrink:0}.speed{display:flex;align-items:center;gap:6px;color:var(--muted);font-size:13px}.speed select{background:var(--paper);border:1px solid var(--line);padding:8px;border-radius:8px;color:var(--ink);min-height:44px;font-size:14px}.primary{background:var(--accent);color:white;padding:11px 16px;border-radius:10px;display:flex;align-items:center;justify-content:center;gap:7px;min-height:46px;white-space:nowrap}.primary:hover{background:var(--accent-dark)}.primary svg{fill:currentColor;stroke:none;width:17px}.word-list{display:block}.word-row{display:grid;grid-template-columns:minmax(0,1fr) 220px;min-height:170px;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);margin-bottom:14px;overflow:hidden;transition:border-color 150ms,background-color 150ms}.word-row.playing{border-color:var(--accent);background:#fff}.word-side{padding:23px 28px;min-width:0;display:flex;flex-direction:column;justify-content:center;align-items:flex-start}.word-topline{display:flex;align-items:center;gap:16px;width:100%}.word-audio{font:700 clamp(27px,3vw,39px)/1.2 Word,sans-serif;letter-spacing:-.02em;border:0;padding:0;background:none;color:var(--ink);text-align:left;overflow-wrap:anywhere}.word-audio:hover{color:var(--accent-dark)}.word-audio.active{color:var(--accent-dark)}.blend-button{background:var(--tint);color:var(--accent-dark);border-radius:8px;padding:8px 12px;display:flex;align-items:center;gap:5px;font-size:14px;min-height:40px;flex-shrink:0;margin-left:auto}.blend-button svg{width:17px}.blend-button:hover{background:#e4daf3}.segments{display:flex;flex-wrap:wrap;gap:7px;margin-top:17px;align-items:center}.segment{font:700 18px/1.2 Word,sans-serif;padding:7px 10px;min-width:36px;min-height:38px;background:#f2edf5;color:#625078;border-radius:7px;transition:background-color 120ms,color 120ms}.segment:hover{background:#e7def1}.segment.active{background:var(--accent);color:#fff}.segment.silent{background:transparent;color:#8b8391;border:1px dashed #c7bfce;cursor:default}.meaning-side{border-left:1px dashed #c8bed4;background:var(--tint);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:16px;gap:8px;min-width:0}.art{width:116px;height:95px;mix-blend-mode:multiply}.art svg{width:100%;height:100%;display:block;overflow:hidden}.meaning{font-size:20px;line-height:1.4;text-align:center;overflow-wrap:anywhere}.meanings-hidden .meaning-side>*{visibility:hidden}.meaning-side.no-art{gap:0}.lesson-pagination{display:flex;align-items:center;justify-content:space-between;margin:24px 0 0;gap:10px}#lesson-position{font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums}#error{background:#f9e8e5;color:#913d32;border:1px solid #e8b7af;border-radius:10px;padding:14px;margin-top:18px}.audio-status{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);background:#44344f;color:white;padding:10px 18px;border-radius:10px;max-width:calc(100vw - 32px);z-index:50;font-size:14px;box-shadow:0 6px 20px #30293620}#loading{padding:40px;color:var(--muted)}
@media(max-width:1100px){.layout{grid-template-columns:240px minmax(0,1fr)}.course-nav{padding-left:14px;padding-right:14px}.lesson-heading{align-items:flex-start;flex-direction:column;gap:18px}.lesson-controls{width:100%;justify-content:space-between}.word-row{grid-template-columns:minmax(0,1fr) 165px}.word-side{padding:22px}.meaning{font-size:19px}}
@media(max-width:700px){.app-header{height:64px;padding:0 16px}.brand{font-size:20px;gap:8px}.brand svg{width:26px}.header-actions{gap:7px}.subtle{padding:8px 10px;font-size:14px}#menu-toggle{display:block}.layout{display:block;min-height:calc(100vh - 64px)}.course-nav{position:fixed;top:64px;left:0;bottom:0;width:280px;max-height:none;z-index:40;transform:translateX(-102%);transition:transform 180ms ease-out}.nav-open .course-nav{transform:translateX(0)}#nav-scrim{position:fixed;inset:64px 0 0;background:#30293635;z-index:30}.nav-open #nav-scrim{display:block!important}main{padding:24px 14px 36px}.lesson-heading{gap:16px;margin-bottom:18px}#unit-name{font-size:12px}h1{font-size:27px}.word-row{grid-template-columns:minmax(0,1fr) 116px;min-height:153px;margin-bottom:12px}.word-side{padding:17px 13px}.word-topline{gap:8px;align-items:flex-start;flex-wrap:wrap}.word-audio{font-size:29px}.blend-button{font-size:12px;padding:7px 9px;min-height:34px}.segments{gap:5px;margin-top:13px}.segment{font-size:16px;min-width:30px;min-height:34px;padding:6px 8px}.meaning-side{padding:10px 8px;gap:6px}.art{width:94px;height:78px}.meaning{font-size:18px}.icon-button{width:38px;height:42px}.primary{min-height:44px;font-size:14px}.speed{font-size:12px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;animation:none!important;scroll-behavior:auto!important}}
@media(max-width:700px){.course-nav{visibility:hidden}.nav-open .course-nav{visibility:visible}}
@media(max-width:360px){.app-header{padding:0 10px}.brand{font-size:18px;gap:4px}.brand svg{width:22px}.header-actions{gap:5px}}
.art.plural-art{display:flex;align-items:center;gap:3px}.plural-art>.art{width:50%;height:100%}