:root {
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-card: rgba(255, 255, 255, 0.02);
    --bg-card-hover: rgba(255, 255, 255, 0.06);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-cyan: #06b6d4;
    --accent-green: #10b981;
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 50%, #ec4899 100%);
    --gradient-green: linear-gradient(135deg, #10b981 0%, #06b6d4 100%);
    --gradient-purple: linear-gradient(135deg, #8b5cf6 0%, #3b82f6 100%);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }
body { font-family: var(--font-sans); background: var(--bg-primary); color: var(--text-primary); line-height: 1.6; overflow-x: hidden; }
h1, h2, h3 { font-weight: 800; line-height: 1.15; letter-spacing: -0.02em; }
.gradient-text { background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }

/* Nav */
.navbar { position: fixed; top: 0; left: 0; right: 0; height: 70px; background: rgba(0,0,0,0.85); backdrop-filter: blur(20px); border-bottom: 1px solid var(--border-color); z-index: 1000; }
.nav-container { max-width: 1400px; margin: 0 auto; padding: 0 24px; height: 100%; display: flex; align-items: center; justify-content: space-between; }
.nav-brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: white; }
.nav-brand img { width: 32px; height: 32px; }
.nav-brand span { font-size: 1.4rem; font-weight: 800; }
.nav-menu { display: flex; gap: 8px; }
.nav-menu a { color: var(--text-secondary); text-decoration: none; padding: 8px 16px; border-radius: 8px; font-size: 0.9rem; transition: 0.15s; }
.nav-menu a:hover { color: white; background: var(--bg-card); }
.nav-actions { display: flex; gap: 12px; align-items: center; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 20px; font-size: 0.9rem; font-weight: 600; text-decoration: none; border-radius: 8px; border: none; cursor: pointer; transition: 0.15s; }
.btn-primary { background: white; color: black; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(255,255,255,0.15); }
.btn-secondary { background: transparent; color: white; border: 1px solid var(--border-color); }
.btn-secondary:hover { background: var(--bg-card); }
.btn-gradient { background: var(--gradient-primary); color: white; }
.btn-gradient:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(139,92,246,0.3); }
.lang-toggle { padding: 6px 12px; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 20px; color: var(--text-secondary); font-size: 0.8rem; cursor: pointer; }
.lang-toggle:hover { color: white; border-color: var(--border-hover); }

/* Hero */
.hero { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 100px 24px 60px; position: relative; overflow: hidden; }
.hero-grid { position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px); background-size: 50px 50px; mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%); }
.hero-glow { position: absolute; top: 0; left: 50%; transform: translateX(-50%); width: 100%; height: 500px; background: radial-gradient(ellipse at center top, rgba(59,130,246,0.15) 0%, transparent 60%); }
.hero-content { max-width: 900px; text-align: center; position: relative; z-index: 1; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; padding: 6px 16px; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 100px; font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 28px; }
.hero-badge-dot { width: 8px; height: 8px; background: var(--accent-green); border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
.hero-title { font-size: clamp(2.8rem, 7vw, 5rem); margin-bottom: 24px; }
.hero-subtitle { font-size: clamp(1rem, 2vw, 1.25rem); color: var(--text-secondary); max-width: 650px; margin: 0 auto 40px; }
.hero-cta { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; margin-bottom: 50px; }
.hero-cta .btn { padding: 14px 32px; font-size: 1rem; }
.hero-stats { display: flex; justify-content: center; gap: 40px; flex-wrap: wrap; padding-top: 40px; border-top: 1px solid var(--border-color); }
.stat-item { text-align: center; }
.stat-value { font-size: 2.2rem; font-weight: 800; font-family: var(--font-mono); }
.stat-label { font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.1em; margin-top: 4px; }

/* Sections */
section { padding: 100px 24px; }
.section-container { max-width: 1400px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-label { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.15em; color: var(--accent-cyan); margin-bottom: 12px; }
.section-title { font-size: clamp(1.8rem, 4vw, 2.8rem); margin-bottom: 16px; }
.section-desc { font-size: 1.05rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

/* Mobile AI Feature */
.mobile-ai { background: var(--bg-secondary); position: relative; overflow: hidden; }
.mobile-ai::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at 70% 50%, rgba(16,185,129,0.1) 0%, transparent 50%); }
.mobile-ai-content { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; position: relative; }
.mobile-ai-text h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); margin-bottom: 20px; }
.mobile-ai-text > p { color: var(--text-secondary); font-size: 1.05rem; line-height: 1.7; margin-bottom: 32px; }
.mobile-ai-features { display: flex; flex-direction: column; gap: 16px; margin-bottom: 32px; }
.ai-feature { display: flex; align-items: flex-start; gap: 14px; padding: 16px; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px; transition: 0.2s; }
.ai-feature:hover { background: var(--bg-card-hover); border-color: var(--border-hover); }
.ai-feature-icon { width: 44px; height: 44px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; background: var(--gradient-green); border-radius: 10px; }
.ai-feature-icon svg { width: 22px; height: 22px; color: white; }
.ai-feature-content h4 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.ai-feature-content p { font-size: 0.85rem; color: var(--text-secondary); }

/* Phone Mockup */
.phone-mockup-wrapper { display: flex; justify-content: center; align-items: center; position: relative; }
.phone-mockup { width: 280px; background: #1a1a1a; border-radius: 40px; padding: 10px; border: 3px solid #333; box-shadow: 0 20px 60px rgba(0,0,0,0.5), 0 0 80px rgba(16,185,129,0.15); position: relative; }
.phone-notch { position: absolute; top: 14px; left: 50%; transform: translateX(-50%); width: 90px; height: 24px; background: #000; border-radius: 0 0 14px 14px; z-index: 10; }
.phone-screen { background: var(--bg-primary); border-radius: 30px; overflow: hidden; aspect-ratio: 9/19.5; }
.phone-screen img { width: 100%; height: 100%; object-fit: cover; }
.phone-glow { position: absolute; inset: -40px; background: radial-gradient(ellipse at center, rgba(16,185,129,0.2) 0%, transparent 70%); z-index: -1; }

/* Features Grid */
.features { background: var(--bg-primary); }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 20px; }
.feature-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 14px; padding: 28px; transition: 0.2s; }
.feature-card:hover { background: var(--bg-card-hover); border-color: var(--border-hover); transform: translateY(-4px); }
.feature-icon { width: 46px; height: 46px; display: flex; align-items: center; justify-content: center; background: var(--gradient-purple); border-radius: 10px; margin-bottom: 18px; }
.feature-icon img { width: 22px; height: 22px; filter: brightness(0) invert(1); }
.feature-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; }
.feature-desc { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; }
.feature-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.feature-tag { padding: 3px 10px; background: rgba(59,130,246,0.1); border: 1px solid rgba(59,130,246,0.2); border-radius: 4px; font-size: 0.7rem; font-family: var(--font-mono); color: var(--accent-blue); }

/* Agent Section */
.agent { background: var(--bg-secondary); position: relative; }
.agent::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at center, rgba(139,92,246,0.08) 0%, transparent 60%); }
.agent-content { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; position: relative; }
.agent-text h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin-bottom: 18px; }
.agent-text > p { color: var(--text-secondary); font-size: 1rem; line-height: 1.7; margin-bottom: 28px; }
.agent-list { display: flex; flex-direction: column; gap: 12px; }
.agent-item { display: flex; align-items: center; gap: 10px; }
.agent-item svg { width: 18px; height: 18px; color: var(--accent-purple); flex-shrink: 0; }
.agent-item span { color: var(--text-secondary); font-size: 0.9rem; }
.agent-diagram { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px; padding: 24px; font-family: var(--font-mono); font-size: 0.75rem; line-height: 1.7; }
.agent-diagram pre { white-space: pre-wrap; color: var(--text-secondary); }
.agent-diagram .keyword { color: var(--accent-purple); }
.agent-diagram .string { color: var(--accent-green); }
.agent-diagram .comment { color: var(--text-muted); }
.agent-diagram .type { color: var(--accent-cyan); }

/* Models */
.models { background: var(--bg-primary); }
.models-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; margin-bottom: 24px; }
.model-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 10px; padding: 20px; text-align: center; transition: 0.2s; }
.model-card:hover { background: var(--bg-card-hover); border-color: var(--border-hover); }
.model-icon { width: 40px; height: 40px; margin: 0 auto 10px; display: flex; align-items: center; justify-content: center; }
.model-icon img { max-width: 100%; max-height: 100%; filter: grayscale(1) brightness(2); opacity: 0.6; transition: 0.2s; }
.model-card:hover .model-icon img { filter: none; opacity: 1; }
.model-name { font-size: 0.85rem; font-weight: 600; }
.model-provider { font-size: 0.7rem; color: var(--text-muted); margin-top: 4px; }
.models-note { text-align: center; color: var(--text-muted); font-size: 0.85rem; }

/* Tools */
.tools { background: var(--bg-secondary); }
.tools-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.tool-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 10px; padding: 20px; display: flex; gap: 14px; transition: 0.2s; }
.tool-card:hover { background: var(--bg-card-hover); }
.tool-icon { width: 36px; height: 36px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; background: rgba(6,182,212,0.15); border-radius: 8px; color: var(--accent-cyan); }
.tool-icon svg { width: 18px; height: 18px; }
.tool-content h4 { font-size: 0.9rem; font-weight: 600; margin-bottom: 4px; }
.tool-content p { font-size: 0.8rem; color: var(--text-secondary); }

/* Languages */
.languages { background: var(--bg-primary); }
.languages-cloud { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-bottom: 20px; }
.lang-tag { padding: 8px 14px; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 6px; font-size: 0.8rem; font-family: var(--font-mono); color: var(--text-secondary); transition: 0.15s; }
.lang-tag:hover { background: var(--bg-card-hover); color: white; border-color: var(--border-hover); }
.lang-tag.highlight { background: rgba(59,130,246,0.1); border-color: rgba(59,130,246,0.3); color: var(--accent-blue); }
.languages-note { text-align: center; color: var(--text-muted); font-size: 0.85rem; }

/* CTA */
.cta { background: var(--bg-secondary); text-align: center; }
.cta-content { max-width: 900px; margin: 0 auto; }
.cta h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin-bottom: 16px; }
.cta > .section-container > .cta-content > p { color: var(--text-secondary); font-size: 1.05rem; margin-bottom: 40px; }

/* Download Section */
.download-section { margin-bottom: 48px; }
.download-section:last-of-type { margin-bottom: 32px; }
.download-section-title { font-size: 1.1rem; font-weight: 600; color: var(--text-secondary); margin-bottom: 20px; }
.download-buttons { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; max-width: 800px; margin: 0 auto; }

.download-btn { display: flex; align-items: center; gap: 14px; padding: 16px 20px; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px; text-decoration: none; transition: 0.2s; text-align: left; }
.download-btn:hover { background: var(--bg-card-hover); border-color: var(--border-hover); transform: translateY(-2px); }
.download-btn.detected-platform { border-color: var(--accent-cyan); box-shadow: 0 0 20px rgba(6,182,212,0.2); }
.download-btn-icon { width: 44px; height: 44px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; background: var(--gradient-primary); border-radius: 10px; }
.download-btn-icon svg { width: 24px; height: 24px; color: white; }
.download-btn-icon.ios-icon { background: linear-gradient(135deg, #555 0%, #333 100%); }
.download-btn-icon.android-icon { background: linear-gradient(135deg, #3ddc84 0%, #00a86b 100%); }
.download-btn-icon.apk-icon { background: linear-gradient(135deg, #6b7280 0%, #4b5563 100%); }
.download-btn-content { display: flex; flex-direction: column; gap: 2px; }
.download-btn-label { font-size: 0.95rem; font-weight: 600; color: white; }
.download-btn-sub { font-size: 0.75rem; color: var(--text-muted); }

.download-github { margin-top: 32px; padding-top: 32px; border-top: 1px solid var(--border-color); }
.download-github .btn { padding: 12px 28px; }

/* Zed Attribution */
.zed-attribution { margin-top: 48px; padding-top: 48px; border-top: 1px solid var(--border-color); }
.zed-attribution-content { display: flex; align-items: center; gap: 24px; padding: 28px 32px; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 16px; max-width: 800px; margin: 0 auto; flex-wrap: wrap; justify-content: center; text-align: center; }
.zed-attribution-icon { width: 56px; height: 56px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%); border-radius: 14px; }
.zed-attribution-icon svg { width: 28px; height: 28px; color: white; }
.zed-attribution-text { flex: 1; min-width: 280px; }
.zed-attribution-text h4 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; color: white; }
.zed-attribution-text p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; margin: 0; }
.zed-attribution-text a { color: var(--accent-cyan); text-decoration: none; font-weight: 500; }
.zed-attribution-text a:hover { text-decoration: underline; }
.zed-github-link { display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px; background: rgba(255,255,255,0.05); border: 1px solid var(--border-color); border-radius: 8px; text-decoration: none; color: var(--text-secondary); font-size: 0.85rem; font-weight: 500; transition: 0.15s; flex-shrink: 0; }
.zed-github-link:hover { background: var(--bg-card-hover); border-color: var(--border-hover); color: white; }
.zed-github-link svg { flex-shrink: 0; }

/* Legacy CTA buttons (for hero section) */
.cta-buttons { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }
.cta-buttons .btn { padding: 14px 32px; font-size: 1rem; }

/* Footer */
footer { background: var(--bg-primary); border-top: 1px solid var(--border-color); padding: 50px 24px 30px; }
.footer-container { max-width: 1400px; margin: 0 auto; }
.footer-grid { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 40px; margin-bottom: 40px; }
.footer-brand p { color: var(--text-secondary); font-size: 0.85rem; margin-top: 14px; max-width: 280px; }
.footer-social { display: flex; gap: 10px; margin-top: 18px; }
.footer-social a { width: 34px; height: 34px; display: flex; align-items: center; justify-content: center; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 6px; transition: 0.15s; }
.footer-social a:hover { background: var(--bg-card-hover); border-color: var(--border-hover); }
.footer-social img { width: 16px; height: 16px; opacity: 0.6; filter: brightness(0) invert(1); }
.footer-social a:hover img { opacity: 1; }
.footer-column h4 { font-size: 0.8rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-muted); margin-bottom: 18px; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { color: var(--text-secondary); text-decoration: none; font-size: 0.85rem; transition: 0.15s; }
.footer-links a:hover { color: white; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 24px; border-top: 1px solid var(--border-color); font-size: 0.8rem; color: var(--text-muted); }

/* Responsive */
@media (max-width: 1024px) {
    .mobile-ai-content, .agent-content { grid-template-columns: 1fr; gap: 50px; }
    .phone-mockup-wrapper { order: -1; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .nav-menu { display: none; }
    .hero-stats { gap: 28px; }
    .stat-value { font-size: 1.8rem; }
    section { padding: 70px 20px; }
    .feature-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
}

/* Bilingual */
body.show-cn .lang-en { display: none !important; }
body.show-en .lang-cn { display: none !important; }