*{margin:0;padding:0;box-sizing:border-box}:root{--bg: #fafafa;--bg-card: #ffffff;--text: #0f172a;--text-secondary: #64748b;--text-muted: #94a3b8;--border: #e2e8f0;--accent: #2563eb;--accent-light: rgba(37, 99, 235, .08);--accent-hover: #1d4ed8;--success: #10b981;--radius: 8px;--radius-lg: 12px}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}button{cursor:pointer;font-family:inherit}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px}.app-layout{display:flex;min-height:100vh}.sidebar{width:240px;border-right:1px solid var(--border);padding:24px 16px;position:sticky;top:0;height:100vh}.sidebar-logo{font-size:22px;font-weight:700;color:var(--accent);margin-bottom:32px;padding:0 8px}.sidebar-nav{list-style:none;display:flex;flex-direction:column;gap:4px}.sidebar-nav a{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--radius);color:var(--text-secondary);font-size:14px;font-weight:500;transition:all .15s;text-decoration:none}.sidebar-nav a:hover{background:var(--accent-light);color:var(--accent);text-decoration:none}.sidebar-nav a.active{background:var(--accent-light);color:var(--accent)}.main-content{flex:1;padding:32px 40px;max-width:900px}.page-title{font-size:24px;font-weight:700;margin-bottom:24px}.chunked-display{font-family:SF Mono,Fira Code,monospace;font-size:14px;line-height:1.8;white-space:pre-wrap;padding:20px 24px;background:var(--accent-light);border-left:3px solid var(--accent);border-radius:var(--radius)}.vocab-item{display:flex;align-items:flex-start;justify-content:space-between;padding:16px 0;border-bottom:1px solid var(--border)}.vocab-item:last-child{border-bottom:none}.vocab-word{font-size:18px;font-weight:600;color:var(--text)}.vocab-definition{font-size:14px;color:var(--text-secondary);margin-top:4px}.vocab-contexts{margin-top:8px;font-size:13px;color:var(--text-muted)}.vocab-context{border-left:2px solid var(--border);padding:4px 0 4px 10px;margin-top:4px}.vocab-exposure{font-size:11px;color:var(--text-muted);background:var(--accent-light);padding:2px 8px;border-radius:12px}.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:var(--radius);font-size:14px;font-weight:500;border:none;transition:all .15s}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-outline{background:transparent;border:1px solid var(--border);color:var(--text-secondary)}.btn-outline:hover{border-color:var(--accent);color:var(--accent)}.btn-success{background:var(--success);color:#fff}.input{width:100%;padding:10px 14px;border:1px solid var(--border);border-radius:var(--radius);font-size:14px;outline:none;transition:border-color .15s;font-family:inherit}.input:focus{border-color:var(--accent)}textarea.input{resize:vertical;min-height:120px}.slider-group{display:flex;align-items:center;gap:16px}.slider-group input[type=range]{flex:1;accent-color:var(--accent)}.slider-value{font-size:20px;font-weight:700;color:var(--accent);min-width:24px;text-align:center}.loading{display:flex;align-items:center;justify-content:center;padding:48px;color:var(--text-muted)}.spinner{width:24px;height:24px;border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .6s linear infinite;margin-right:12px}@keyframes spin{to{transform:rotate(360deg)}}.empty-state{text-align:center;padding:64px 24px;color:var(--text-muted)}.empty-state h3{font-size:18px;font-weight:600;color:var(--text-secondary);margin-bottom:8px}