:root{--color-neutral-50:#fafafa;--color-neutral-100:#f5f5f5;--color-neutral-200:#e5e5e5;--color-neutral-300:#d4d4d4;--color-neutral-400:#a3a3a3;--color-neutral-500:#737373;--color-neutral-600:#525252;--color-neutral-700:#404040;--color-neutral-800:#262626;--color-neutral-900:#171717;--color-neutral-950:#0a0a0a;--color-accent:#3b82f6;--color-accent-hover:#2563eb;--color-accent-muted:rgba(59, 130, 246, 0.17);--color-success:#22c55e;--color-warning:#eab308;--color-error:#ef4444;--bg-primary:#ffffff;--bg-secondary:#fafafa;--bg-tertiary:#f5f5f5;--bg-elevated:#ffffff;--bg-settings:#393939;--bg-overlay:rgba(0, 0, 0, 0.5);--text-primary:#171717;--text-secondary:#525252;--text-tertiary:#737373;--text-muted:#a3a3a3;--text-inverse:#fafafa;--settings-label:#a6a6a6;--border-primary:#b6b4b5;--border-secondary:#d4d4d4;--border-focus:var(--color-accent);--bg-user-message:#f5f5f5;--border-message:#e5e5e5;--bg-code:#1e1e1e;--text-code:#d4d4d4;--shadow-xs:0 1px 2px rgba(0, 0, 0, 0.04);--shadow-sm:0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);--shadow-md:0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -1px rgba(0, 0, 0, 0.04);--shadow-lg:0 10px 15px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -2px rgba(0, 0, 0, 0.03);--shadow-overlay:0 25px 50px -12px rgba(0, 0, 0, 0.15);--space-1:0.25rem;--space-2:0.5rem;--space-3:0.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--radius-sm:4px;--radius-md:6px;--radius-lg:8px;--radius-xl:12px;--radius-full:9999px;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, sans-serif;--font-mono:"JetBrains Mono", "Fira Code", "Cascadia Code", Consolas, monospace;--text-xs:0.8rem;--text-sm:0.9rem;--text-base:0.95rem;--text-lg:1rem;--text-xl:1.125rem;--leading-tight:1.25;--leading-normal:1.5;--leading-relaxed:1.625;--transition-fast:100ms ease;--transition-base:150ms ease;--transition-slow:250ms 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var(--scrollbar-track)}.settings-body::-webkit-scrollbar{width:6px}.settings-body::-webkit-scrollbar-track{background:var(--scrollbar-track)}.settings-body::-webkit-scrollbar-thumb{background:var(--scrollbar-thumb);border-radius:var(--radius-full)}.settings-body::-webkit-scrollbar-thumb:hover{background:var(--scrollbar-thumb);filter:brightness(.8)}.app-header{position:sticky;top:0;z-index:10;margin:0 auto;background-color:var(--bg-primary)}.app-header-bar{display:flex;align-items:center;justify-content:space-between;height:44px;padding:0 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0;font-size:.83rem;line-height:1.5;color:#64748b}.plan-lesson{display:grid;gap:.35rem;padding:.75rem 0 0;border-bottom:1px solid #f1f5f9}.plan-lesson:last-child{border-bottom:none}.plan-lesson-heading{display:flex;align-items:center;gap:.55rem}.plan-lesson-number{display:inline-flex;align-items:center;justify-content:center;min-width:1.7rem;height:1.7rem;border-radius:999px;background:linear-gradient(135deg,#475569,#64748b);color:#fff;font-size:.72rem;font-weight:700;flex-shrink:0;padding:0 .45rem}.plan-lesson-title{font-weight:600;font-size:.92rem;color:#1e293b}.plan-lesson-desc{width:100%;padding-left:2.25rem;font-size:.8rem;color:#64748b;line-height:1.5}.plan-raw-content{font-size:.88rem;color:#334155;line-height:1.6;padding:.25rem 0}.plan-sublesson{display:flex;align-items:flex-start;gap:.55rem;padding:.45rem 0 .45rem 2.25rem;border-bottom:1px solid 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mark{background-color:var(--color-accent-muted);color:var(--text-primary);border-radius:2px;padding:0 1px}.search-empty{padding:var(--space-4) var(--space-3);text-align:center;color:var(--text-muted);font-size:var(--text-sm)}.search-loading{padding:var(--space-4) var(--space-3);text-align:center;color:var(--text-muted);font-size:var(--text-sm)}.search-filters{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-1) var(--space-3) var(--space-2);font-size:var(--text-xs);color:var(--text-muted);border-bottom:1px solid var(--border-primary)}.search-filter-check{display:flex;align-items:center;gap:4px;cursor:pointer;white-space:nowrap}.search-filter-check input[type="checkbox"]{margin:0;accent-color:var(--color-accent)}.search-filter-select{padding:2px 4px;font-size:var(--text-xs);border:1px solid var(--border-primary);border-radius:var(--radius-sm);background:var(--bg-primary);color:var(--text-secondary)}.search-badge{font-size:10px;padding:1px 5px;border-radius:var(--radius-sm);font-weight:600;text-transform:uppercase;letter-spacing:.02em}.search-badge.closed{background:var(--color-warning-muted,rgb(255 193 7 / .15));color:var(--color-warning,#ffc107)}.search-badge.archived{background:var(--color-danger-muted,rgb(220 53 69 / .15));color:var(--color-danger,#dc3545)}.tab-panels{flex:1;display:flex;flex-direction:column;overflow:hidden;min-height:0;align-items:center;background:radial-gradient(circle,#ababab 0%,#ffffff 75%)}.tab-panels>.tab-panel{width:min(100%, var(--app-max-width));box-shadow:0 0 16px rgb(0 0 0 / .3)}.tab-panel{display:none;flex-direction:column;flex:1;overflow:hidden;min-height:0}.tab-panel.active,.tab-panel[aria-hidden="false"]{display:flex}.settings-panel{position:relative;background-color:var(--bg-primary);border-bottom:1px solid var(--border-primary);flex-shrink:0}.settings-header{position:relative;display:flex;align-items:center;justify-content:space-between;height:40px;padding:0 var(--space-4);cursor:pointer;user-select:none}.settings-header:hover{background-color:var(--bg-secondary)}.settings-header.has-missing-fields .settings-icon::after{content:"";position:absolute;top:-2px;right:-4px;width:6px;height:6px;background-color:var(--color-error);border-radius:50%}.settings-header-left{display:flex;align-items:center;gap:var(--space-2)}.settings-title{font-size:var(--text-sm);font-weight:600;color:var(--text-primary)}.settings-icon{position:relative;color:var(--text-secondary);display:flex;align-items:center}.settings-chevron{color:var(--text-muted);transition:transform var(--transition-base)}.settings-panel.expanded .settings-chevron{transform:rotate(180deg)}.settings-header-right{display:flex;align-items:center;gap:var(--space-3)}.settings-body{display:none;padding:var(--space-4);border-top:1px solid var(--border-primary);background-color:#393939;max-height:60vh;overflow-y:auto;overflow-x:hidden}.settings-panel.expanded 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var(--transition-fast)}.settings-toggle-btn:hover{background-color:var(--bg-secondary);color:var(--text-primary)}.chat-area{flex:1;display:flex;flex-direction:column;overflow:hidden;background-color:var(--bg-primary);min-height:0;position:relative}.chat-messages{flex:1;min-height:0;padding:var(--space-4);overscroll-behavior:contain}.chat-empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;text-align:center;padding:var(--space-8)}.chat-empty-state-icon{width:48px;height:48px;margin-bottom:var(--space-4);color:var(--text-muted);opacity:.5}.chat-empty-state-title{font-size:var(--text-lg);font-weight:600;color:var(--text-primary);margin-bottom:var(--space-2)}.chat-empty-state-description{font-size:var(--text-sm);color:var(--text-tertiary);max-width:320px}.message{animation:message-fade-in 0.2s ease}.message.search-highlight{animation:search-pulse 0.6s ease 2;outline:2px solid 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var(--color-accent-muted)}.chat-input:focus-visible{outline:1px solid var(--color-accent);outline-offset:0}.chat-input::placeholder{color:var(--text-muted)}.chat-send-btn{display:flex;align-items:center;justify-content:center;width:40px;height:40px;padding:0;background-color:var(--color-accent);border:none;border-radius:var(--radius-lg);color:var(--text-inverse);cursor:pointer;transition:all var(--transition-fast);flex-shrink:0}.chat-send-btn:hover:not(:disabled){background-color:var(--color-accent-hover)}.chat-send-btn:disabled{background-color:var(--border-primary);cursor:not-allowed}.chat-send-btn svg{width:18px;height:18px}.chat-input-copy{position:absolute;right:8px;bottom:8px;opacity:0;transition:opacity var(--transition-fast),color var(--transition-fast),background-color var(--transition-fast);background:#fff0;color:var(--text-muted);z-index:1;border-radius:var(--radius-sm)}.chat-input-container:hover .chat-input-copy,.chat-input-container:focus-within .chat-input-copy{opacity:1}.chat-input-copy:hover{background-color:var(--bg-tertiary);color:var(--color-accent)}.action-btn{display:flex;align-items:center;gap:var(--space-1);padding:var(--space-1) var(--space-2);background-color:var(--bg-tertiary);border:1px solid var(--border-primary);border-radius:var(--radius-md);font-size:var(--text-xs);font-weight:500;color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast);white-space:nowrap}.action-btn:hover{background-color:var(--bg-secondary);border-color:var(--border-secondary);color:var(--text-primary)}.action-btn svg{width:14px;height:14px}.action-btn-icon{padding:var(--space-1);width:28px;height:28px;justify-content:center}.action-btn-icon svg{width:16px;height:16px}.action-btn-danger{color:var(--color-error);border-color:rgb(239 68 68 / .3)}.action-btn-danger:hover{background-color:rgb(239 68 68 / 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