:root{--bg: oklch(.985 .004 80);--bg-elev: #ffffff;--surface: oklch(.975 .005 80);--surface-2: oklch(.955 .006 80);--surface-3: oklch(.93 .008 80);--border: oklch(.91 .008 80);--border-strong: oklch(.84 .012 80);--divider: oklch(.94 .006 80);--ink: oklch(.22 .015 260);--ink-2: oklch(.4 .014 260);--ink-3: oklch(.55 .012 260);--ink-4: oklch(.68 .01 260);--accent: oklch(.54 .13 252);--accent-2: oklch(.62 .13 252);--accent-soft: oklch(.94 .04 252);--accent-ink: oklch(.38 .13 252);--ai: oklch(.56 .14 295);--ai-soft: oklch(.95 .04 295);--ai-ink: oklch(.4 .14 295);--tag-vocab: oklch(.55 .13 252);--tag-vocab-soft: oklch(.95 .035 252);--tag-phrase: oklch(.55 .12 160);--tag-phrase-soft: oklch(.95 .035 160);--tag-idiom: oklch(.55 .14 295);--tag-idiom-soft: oklch(.95 .035 295);--tag-slang: oklch(.58 .14 330);--tag-slang-soft: oklch(.95 .035 330);--tag-culture: oklch(.6 .12 60);--tag-culture-soft: oklch(.95 .04 60);--tag-listen: oklch(.58 .13 25);--tag-listen-soft: oklch(.95 .035 25);--tag-grammar: oklch(.55 .1 200);--tag-grammar-soft: oklch(.94 .03 200);--ok: oklch(.62 .11 150);--warn: oklch(.68 .12 65);--err: oklch(.58 .18 25);--r-xs: 6px;--r-sm: 8px;--r-md: 12px;--r-lg: 16px;--r-xl: 22px;--shadow-sm: 0 1px 0 rgba(20,20,30,.03), 0 1px 2px rgba(20,20,30,.04);--shadow-md: 0 1px 0 rgba(20,20,30,.03), 0 4px 14px -4px rgba(20,20,30,.08);--shadow-lg: 0 1px 0 rgba(20,20,30,.04), 0 20px 50px -12px rgba(20,20,30,.12);--font-ui: "Geist", ui-sans-serif, system-ui, -apple-system, "Helvetica Neue", sans-serif;--font-serif: "Newsreader", "Iowan Old Style", Georgia, serif;--font-mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.85)}}@keyframes seek-flash{0%{opacity:0;transform:translate(-50%,-8px)}15%{opacity:1;transform:translate(-50%)}80%{opacity:1;transform:translate(-50%)}to{opacity:0;transform:translate(-50%,-2px)}}*{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:var(--font-ui);background:var(--bg);color:var(--ink);font-feature-settings:"ss01","cv11";-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}button{font-family:inherit;cursor:pointer}img{max-width:100%;display:block}.app{display:grid;grid-template-columns:var(--sidebar-w, 232px) 1fr;min-height:100vh}.sidebar{border-right:1px solid var(--border);background:var(--surface);padding:18px 14px;display:flex;flex-direction:column;gap:22px;position:sticky;top:0;height:100vh;overflow-y:auto}.brand{display:flex;align-items:center;gap:10px;padding:6px 8px 4px}.brand-mark{width:28px;height:28px;border-radius:8px;background:linear-gradient(150deg,var(--ink) 0%,oklch(.3 .05 252) 100%);display:grid;place-items:center;color:#fff;font-weight:600;font-size:13px;letter-spacing:-.02em;box-shadow:inset 0 1px #ffffff2e}.brand-name{font-weight:600;font-size:15px;letter-spacing:-.01em}.brand-ver{font-size:10px;color:var(--ink-3);font-family:var(--font-mono);background:var(--surface-3);padding:1px 5px;border-radius:4px}.nav-group-title{font-size:10.5px;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-4);padding:0 8px 6px}.nav-list{display:flex;flex-direction:column;gap:1px}.nav-item{display:flex;align-items:center;gap:10px;padding:7px 9px;border-radius:var(--r-sm);font-size:13.5px;color:var(--ink-2);background:transparent;border:none;text-align:left;width:100%;letter-spacing:-.005em}.nav-item:hover{background:var(--surface-2);color:var(--ink)}.nav-item.active{background:var(--bg-elev);color:var(--ink);box-shadow:var(--shadow-sm)}.nav-item .ico{width:16px;height:16px;color:var(--ink-3);flex:none}.nav-item.active .ico{color:var(--accent)}.nav-item .count{margin-left:auto;font-size:11px;color:var(--ink-3);font-family:var(--font-mono)}.sidebar-footer{margin-top:auto;padding:10px;border-top:1px solid var(--border);display:flex;align-items:center;gap:10px}.avatar{width:28px;height:28px;border-radius:50%;background:linear-gradient(135deg,#6fa2db,#7860b5);color:#fff;font-size:11px;font-weight:600;display:grid;place-items:center}.user-name{font-size:13px;font-weight:500}.user-plan{font-size:11px;color:var(--ink-3)}.main{min-width:0}.viewport{min-height:100vh;background:var(--bg)}.btn{display:inline-flex;align-items:center;gap:7px;height:36px;padding:0 14px;border-radius:9px;background:var(--bg-elev);color:var(--ink);border:1px solid var(--border);font-size:13.5px;font-weight:500;letter-spacing:-.005em;white-space:nowrap;flex-shrink:0;transition:background .15s,border-color .15s,transform .05s}.chip{white-space:nowrap}.btn:hover{background:var(--surface);border-color:var(--border-strong)}.btn:active{transform:translateY(.5px)}.btn.primary{background:var(--ink);color:var(--bg-elev);border-color:var(--ink)}.btn.primary:hover{background:#282e38}.btn.accent{background:var(--accent);color:#fff;border-color:var(--accent)}.btn.accent:hover{background:var(--accent-2)}.btn.ai{background:linear-gradient(135deg,var(--ai),oklch(.5 .16 280));color:#fff;border:none}.btn.ghost{background:transparent;border-color:transparent}.btn.ghost:hover{background:var(--surface-2)}.btn.sm{height:28px;padding:0 10px;font-size:12.5px;border-radius:7px}.btn.lg{height:44px;padding:0 20px;font-size:14.5px;border-radius:11px}.btn .ico{width:15px;height:15px}.card{background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-sm)}.panel{background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--r-md)}.kbd{display:inline-flex;align-items:center;justify-content:center;min-width:18px;height:18px;padding:0 5px;font-family:var(--font-mono);font-size:10.5px;background:var(--surface-2);border:1px solid var(--border);border-bottom-width:1.5px;color:var(--ink-2);border-radius:4px}.tag{display:inline-flex;align-items:center;gap:4px;font-size:10.5px;font-weight:500;padding:2px 7px;border-radius:999px;letter-spacing:.01em;line-height:1.4}.tag .dot{width:5px;height:5px;border-radius:50%;background:currentColor;opacity:.85}.tag.vocab{background:var(--tag-vocab-soft);color:var(--tag-vocab)}.tag.phrase{background:var(--tag-phrase-soft);color:var(--tag-phrase)}.tag.idiom{background:var(--tag-idiom-soft);color:var(--tag-idiom)}.tag.slang{background:var(--tag-slang-soft);color:var(--tag-slang)}.tag.culture{background:var(--tag-culture-soft);color:#7f4400;color:oklch(.45 .12 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xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23737373' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><path d='m6 9 6 6 6-6'/></svg>");background-repeat:no-repeat;background-position:right 10px center;background-size:11px}.input:focus,.textarea:focus,.select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in oklch,var(--accent) 18%,transparent)}.input.lg{font-size:15px;padding:14px 16px;border-radius:11px}.field-label{font-size:12px;color:var(--ink-3);margin-bottom:6px;font-weight:500}.h-display{font-family:var(--font-serif);font-weight:400;font-style:italic;letter-spacing:-.025em;line-height:1.02}.no-serif-display 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