:root{--bg-root: #09090b;--bg-surface: #18181b;--bg-surface-hover: #27272a;--text-primary: #ffffff;--text-secondary: #a1a1aa;--text-tertiary: #71717a;--text-code: #e4e4e7;--accent-primary: #ffffff;--accent-primary-fg: #000000;--accent-primary-hover: #e4e4e7;--accent-brand: #3b82f6;--border: #27272a;--border-hover: #3f3f46;--success: #10b981;--error: #ef4444;--warning: #f59e0b;--hero-gradient-from: #ffffff;--hero-gradient-to: #a1a1aa;--cta-primary-start: #ffffff;--cta-primary-end: #d4d4d8;--cta-primary-text: #0b0b0f;--cta-primary-sub: #1f2937;--cta-glow: 0 12px 30px -18px rgba(255, 255, 255, .7);--chat-surface: #000000;--muted-surface: #27272a;--pre-bg: #0c0c0f;--code-block-bg: #000000;--inline-code-bg: rgba(255, 255, 255, .05);--surface-veil-weak: rgba(255, 255, 255, .05);--surface-veil-strong: rgba(255, 255, 255, .08);--soft-panel: rgba(255, 255, 255, .02);--radius-sm: 6px;--radius-md: 8px;--radius-lg: 12px;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", "Fira Code", monospace;--ease: cubic-bezier(.25, .1, .25, 1)}:root[data-theme=light]{--bg-root: #f8fafc;--bg-surface: #ffffff;--bg-surface-hover: #f1f5f9;--text-primary: #0b1120;--text-secondary: #475569;--text-tertiary: #64748b;--text-code: #0f172a;--accent-primary: #111827;--accent-primary-fg: #f8fafc;--accent-primary-hover: #1f2937;--accent-brand: #2563eb;--border: #e2e8f0;--border-hover: #cbd5e1;--success: #10b981;--error: #ef4444;--warning: #f59e0b;--hero-gradient-from: #0f172a;--hero-gradient-to: #334155;--cta-primary-start: #111827;--cta-primary-end: #1f2937;--cta-primary-text: #f8fafc;--cta-primary-sub: #e2e8f0;--cta-glow: 0 12px 30px -18px rgba(0, 0, 0, .12);--chat-surface: #ffffff;--muted-surface: #e5e7eb;--pre-bg: #f3f4f6;--code-block-bg: #f8fafc;--inline-code-bg: rgba(15, 23, 42, .06);--surface-veil-weak: rgba(15, 23, 42, .05);--surface-veil-strong: rgba(15, 23, 42, .08);--soft-panel: rgba(15, 23, 42, .03)}*,*:before,*:after{box-sizing:border-box}body{margin:0;font-family:var(--font-sans);background-color:var(--bg-root);color:var(--text-primary);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}a{text-decoration:none;color:inherit;transition:color .2s}button{font-family:inherit;border:none;background:none;cursor:pointer}h1,h2,h3,h4{margin:0;font-weight:600;letter-spacing:-.02em}code{font-family:var(--font-mono);font-size:.9em}.page{max-width:1024px;margin:0 auto;padding:0 24px 64px}.nav{display:flex;align-items:center;justify-content:space-between;padding:20px 0;margin-bottom:60px}.brand{display:flex;align-items:center;gap:12px;cursor:pointer}.brand-logo{width:28px;height:28px;object-fit:contain;filter:drop-shadow(0 0 4px rgba(0,0,0,.35))}.brand-mark{width:24px;height:24px;background:var(--text-primary);border-radius:4px}.brand-text{font-weight:600;font-size:16px;letter-spacing:-.01em}.nav-actions{display:flex;gap:16px;align-items:center;font-size:14px}.nav-links{display:flex;gap:12px;align-items:center}.nav-link{color:var(--text-secondary);padding:8px 10px;border-radius:var(--radius-sm)}.nav-link:hover{color:var(--text-primary);background:var(--surface-veil-weak)}.nav-link.active{color:var(--text-primary);background:var(--surface-veil-strong)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:0 16px;height:40px;border-radius:var(--radius-sm);font-size:14px;font-weight:500;transition:all .2s var(--ease)}.btn-sm{height:32px;font-size:13px;padding:0 12px}.btn-primary{background:var(--accent-primary);color:var(--accent-primary-fg)}.btn-primary:hover{background:var(--accent-primary-hover)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:var(--bg-surface);color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover{background:var(--bg-surface-hover);border-color:var(--border-hover)}.btn-ghost{color:var(--text-secondary)}.btn-ghost:hover{color:var(--text-primary);background:var(--surface-veil-weak)}.btn-icon{width:34px;height:34px;padding:0;border-radius:999px;border:1px solid var(--border);color:var(--text-secondary);background:transparent;transition:all .2s var(--ease)}.btn-icon:hover{background:var(--surface-veil-weak);border-color:var(--border-hover);color:var(--text-primary)}.btn-icon:focus-visible{outline:2px solid var(--accent-brand);outline-offset:2px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.hero{margin-bottom:96px}.badge-pill{display:inline-block;font-size:13px;color:var(--accent-brand);font-weight:500;margin-bottom:24px}.hero h1{font-size:56px;line-height:1.05;margin-bottom:24px;background:linear-gradient(to bottom,var(--hero-gradient-from),var(--hero-gradient-to));-webkit-background-clip:text;-webkit-text-fill-color:transparent;max-width:800px}.hero p{font-size:20px;color:var(--text-secondary);max-width:600px;margin-bottom:32px;line-height:1.5}.hero-actions{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:12px;margin-bottom:48px}.cta-button{width:100%;text-align:left;padding:16px 18px;border-radius:var(--radius-md);border:1px solid var(--border);background:var(--bg-surface);color:var(--text-primary);display:grid;gap:6px;transition:all .2s var(--ease)}.cta-button:hover{background:var(--bg-surface-hover);border-color:var(--border-hover);transform:translateY(-1px)}.cta-button:disabled{opacity:.6;cursor:not-allowed;transform:none}.cta-primary{background:linear-gradient(135deg,var(--cta-primary-start),var(--cta-primary-end));color:var(--cta-primary-text);border-color:transparent;box-shadow:var(--cta-glow)}.cta-primary .cta-subtitle{color:var(--cta-primary-sub)}.cta-primary:hover{filter:brightness(.97);transform:translateY(-1px)}.cta-ghost{background:transparent}.cta-title{font-size:16px;font-weight:600;letter-spacing:-.01em}.cta-subtitle{font-size:13px;color:var(--text-secondary);line-height:1.5}.chat-card{border:1px solid var(--border);border-radius:var(--radius-md);background:var(--chat-surface);overflow:hidden;display:flex;flex-direction:column;height:min(650px,75vh);box-shadow:0 20px 40px -20px #00000080}.chat-header{padding:12px 20px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;background:var(--bg-surface)}.chat-actions{display:flex;align-items:center;gap:12px}.model-badge{background:var(--muted-surface);color:var(--text-secondary);font-size:12px;padding:2px 8px;border-radius:4px;font-family:var(--font-mono)}.chat-window{flex:1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:24px}.message{display:grid;grid-template-columns:24px 1fr;gap:16px;font-size:15px;line-height:1.6}.message-role{width:24px;height:24px;display:grid;place-items:center;border-radius:4px}.role-icon{width:16px;height:16px}.role-user{background:var(--text-primary);color:var(--bg-root)}.role-ai{background:var(--success);color:#fff}.message-content{color:var(--text-primary);white-space:pre-wrap}.message-content.user{color:var(--text-secondary)}.markdown-body{color:var(--text-primary);line-height:1.6}.markdown-body h1,.markdown-body h2,.markdown-body h3,.markdown-body h4,.markdown-body h5{margin:0 0 8px;font-weight:600;line-height:1.3}.markdown-body h1{font-size:22px}.markdown-body h2{font-size:20px}.markdown-body h3{font-size:18px}.markdown-body p{margin:0 0 10px;color:var(--text-primary)}.markdown-body code{font-family:var(--font-mono);background:var(--inline-code-bg);padding:2px 6px;border-radius:4px;border:1px solid var(--border)}.markdown-body pre{margin:8px 0 12px;background:var(--pre-bg);border:1px solid var(--border);padding:12px;border-radius:var(--radius-sm);overflow-x:auto}.markdown-body pre code{padding:0;border:none;background:transparent}.markdown-body ul,.markdown-body ol{margin:0 0 10px 18px;color:var(--text-primary)}.markdown-body table{width:100%;border-collapse:collapse;margin:8px 0 12px;font-size:14px}.markdown-body th,.markdown-body td{border:1px solid var(--border);padding:8px;text-align:left}.markdown-body th{background:var(--bg-surface);color:var(--text-primary)}.chat-input-area{padding:20px;border-top:1px solid var(--border);background:var(--bg-root)}.input-wrapper{position:relative;display:flex;align-items:center}.input-field{width:100%;background:transparent;border:1px solid var(--border);color:var(--text-primary);padding:12px 48px 12px 16px;border-radius:var(--radius-sm);font-size:15px;font-family:inherit;transition:border-color .2s;line-height:1.5;min-height:56px;resize:vertical}.input-field:focus{outline:none;border-color:var(--text-secondary)}.send-btn-icon{position:absolute;right:8px;top:50%;transform:translateY(-50%);padding:6px;border-radius:4px;color:var(--text-secondary);transition:all .2s}.send-btn-icon:hover:not(:disabled){background:var(--bg-surface-hover);color:var(--text-primary)}.send-btn-icon:disabled{opacity:.3}.section-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px;margin-bottom:96px}.card{padding:24px;border:1px solid var(--border);border-radius:var(--radius-md);background:transparent;transition:border-color 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.2s}.form-input:focus{outline:none;border-color:var(--accent-brand)}.card-header-row{display:flex;align-items:center;justify-content:space-between;gap:12px}.pill{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;font-size:12px;border:1px solid var(--border);color:var(--text-secondary)}.pill-success{background:#10b9811f;color:var(--success);border-color:#10b98180}.pill-warning{background:#f59e0b1f;color:var(--warning);border-color:#f59e0b80}.auth-state{border:1px solid 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var(--border);border-radius:var(--radius-md);background:var(--soft-panel);color:var(--text-secondary)}.footer{margin-top:64px;padding:20px 0 40px;border-top:1px solid var(--border);display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;color:var(--text-secondary);font-size:13px}.footer-links{display:flex;gap:16px;flex-wrap:wrap}.footer a{color:var(--text-secondary)}.footer a:hover{color:var(--text-primary)}.footer-social{display:flex;align-items:center;gap:10px}.social-icon{width:36px;height:36px;border:1px solid var(--border);border-radius:var(--radius-sm);display:grid;place-items:center;color:var(--text-secondary);background:var(--bg-surface);transition:all .2s var(--ease)}.social-icon:hover{color:var(--text-primary);border-color:var(--border-hover);background:var(--surface-veil-weak);transform:translateY(-1px)}.social-icon svg{width:16px;height:16px}.footer-copy{color:var(--text-tertiary)}.modal-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;background:#000000d9;display:flex;align-items:center;justify-content:center;z-index:1000;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.modal-content{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:32px;max-width:480px;width:90%;text-align:center;box-shadow:0 20px 50px #00000080}.modal-content h2{font-size:24px;margin-bottom:16px;color:var(--text-primary)}.modal-content p{color:var(--text-secondary);margin-bottom:24px;font-size:15px}.modal-actions{display:grid;grid-template-columns:1fr 1fr;gap:16px}@media (max-width: 768px){.page{padding:0 16px 56px}.nav{padding:14px 0;margin-bottom:36px}.nav-actions{gap:10px}.hero{margin-bottom:72px;text-align:center}.hero h1{font-size:36px;line-height:1.15;margin-left:auto;margin-right:auto}.hero p{font-size:16px;margin-left:auto;margin-right:auto}.hero-actions{grid-template-columns:1fr;gap:10px}.cta-button{text-align:left}.chat-card{height:75vh}.chat-window{padding:16px}.section-grid{gap:16px;margin-bottom:72px}.card{padding:18px}.auth-actions-grid,.modal-actions{grid-template-columns:1fr}}@media (max-width: 480px){.hero h1{font-size:30px}.hero p,.cta-title{font-size:15px}.cta-subtitle{font-size:12px}}.text-muted{color:var(--text-secondary);font-size:13px}.text-right{text-align:right}.w-full{width:100%}.mb-4{margin-bottom:16px}.mt-4{margin-top:16px}.flex-row{display:flex;gap:12px}.items-center{align-items:center}.justify-between{justify-content:space-between}