:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #0d0d0d;
    --bg-tertiary: #111111;
    --border: #141414;
    --border-light: #1a1a1a;
    --text-primary: #f5f5f5;
    --text-secondary: #a0a0a0;
    --text-tertiary: #666666;
    --hover: #333333;
    --hover-bg: rgba(255,255,255,0.03);
    --glow: rgba(255,255,255,0.05);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}
::selection { background: var(--hover); color: var(--text-primary); }
.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    padding: 0 24px; background: rgba(10,10,10,0.85);
    backdrop-filter: blur(20px); border-bottom: 1px solid var(--border); height: 64px;
}
.nav-inner { max-width: 1280px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; height: 100%; }
.nav-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text-primary); }
.nav-logo-x { display: flex; align-items: center; justify-content: center; width: 32px; height: 32px; background: var(--text-primary); color: var(--bg-primary); font-size: 14px; font-weight: 800; border-radius: 6px; }
.nav-logo-text { font-size: 18px; font-weight: 600; letter-spacing: -0.02em; }
.nav-logo-text em { font-style: normal; font-weight: 300; color: var(--text-tertiary); }
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a { color: var(--text-secondary); text-decoration: none; font-size: 14px; transition: color 0.2s; }
.nav-links a:hover { color: var(--text-primary); }
.nav-cta { padding: 8px 20px; border: 1px solid var(--border-light); border-radius: 6px; font-size: 13px !important; font-weight: 500 !important; transition: all 0.2s !important; }
.nav-cta:hover { border-color: var(--hover); background: var(--hover-bg); }
.hero { min-height: 100vh; display: flex; align-items: center; justify-content: center; position: relative; padding: 120px 24px 80px; overflow: hidden; }
.hero-grid { position: absolute; inset: 0; background-image: linear-gradient(var(--border) 1px, transparent 1px), linear-gradient(90deg, var(--border) 1px, transparent 1px); background-size: 80px 80px; opacity: 0.3; mask-image: radial-gradient(ellipse 60% 50% at 50% 50%, black 20%, transparent 70%); }
.hero-content { position: relative; text-align: center; max-width: 800px; }
.hero-badge { display: inline-block; padding: 6px 16px; border: 1px solid var(--border-light); border-radius: 100px; font-size: 12px; font-weight: 500; color: var(--text-tertiary); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 32px; }
.hero-title { font-size: clamp(40px, 8vw, 88px); font-weight: 800; line-height: 1.05; letter-spacing: -0.04em; margin-bottom: 24px; }
.hero-subtitle { font-size: clamp(16px, 2vw, 20px); color: var(--text-secondary); line-height: 1.6; margin-bottom: 48px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary { display: inline-block; padding: 14px 32px; background: var(--text-primary); color: var(--bg-primary); text-decoration: none; font-size: 14px; font-weight: 600; border-radius: 8px; transition: all 0.2s; }
.btn-primary:hover { background: #d0d0d0; transform: translateY(-1px); }
.btn-secondary { display: inline-block; padding: 14px 32px; background: transparent; color: var(--text-primary); text-decoration: none; font-size: 14px; font-weight: 500; border-radius: 8px; border: 1px solid var(--border-light); transition: all 0.2s; }
.btn-secondary:hover { border-color: var(--hover); background: var(--hover-bg); }
.hero-scroll { position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; align-items: center; gap: 8px; }
.hero-scroll span { font-size: 11px; color: var(--text-tertiary); text-transform: uppercase; letter-spacing: 0.15em; }
.scroll-line { width: 1px; height: 40px; background: linear-gradient(to bottom, var(--text-tertiary), transparent); animation: scrollPulse 2s ease-in-out infinite; }
@keyframes scrollPulse { 0%,100%{opacity:0.3} 50%{opacity:1} }

/* Partner Section */
.partner {
    background: var(--bg-primary);
    padding: 120px 40px;
    max-width: 1280px;
    margin: 0 auto;
    border-top: 1px solid var(--border);
}
.partner-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 64px;
}
.partner-card {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 40px 32px;
    background: var(--bg-secondary);
    transition: all 0.3s;
    cursor: default;
}
.partner-card:hover {
    border-color: var(--hover);
    background: var(--bg-tertiary);
    transform: translateY(-2px);
}
.partner-num {
    font-size: 12px;
    font-weight: 700;
    color: var(--text-tertiary);
    letter-spacing: 0.1em;
    margin-bottom: 16px;
}
.partner-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}
.partner-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}
.partner-cta {
    text-align: center;
    padding: 48px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--bg-secondary);
}
.partner-cta-text {
    font-size: 18px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 24px;
    letter-spacing: -0.01em;
}

section { padding: 120px 24px; }
.section-header { text-align: center; max-width: 700px; margin: 0 auto 80px; }
.section-label { display: inline-block; font-size: 12px; font-weight: 600; color: var(--text-tertiary); letter-spacing: 0.15em; text-transform: uppercase; margin-bottom: 16px; }
.section-title { font-size: clamp(32px, 5vw, 56px); font-weight: 700; line-height: 1.1; letter-spacing: -0.03em; margin-bottom: 24px; }
.section-desc { font-size: 17px; color: var(--text-secondary); line-height: 1.7; max-width: 560px; margin: 0 auto; }
.overview { background: var(--bg-secondary); display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: start; padding: 120px 40px; max-width: 1280px; margin: 0 auto; }
.overview-sticky { position: sticky; top: 120px; }
.overview-cards { display: flex; flex-direction: column; gap: 48px; }
.overview-card { border-left: 1px solid var(--border); padding-left: 24px; transition: border-color 0.3s; cursor: default; }
.overview-card:hover { border-left-color: var(--text-tertiary); }
.overview-card-num { font-size: 12px; font-weight: 600; color: var(--text-tertiary); margin-bottom: 12px; letter-spacing: 0.1em; }
.overview-card h3 { font-size: 22px; font-weight: 600; margin-bottom: 12px; letter-spacing: -0.02em; }
.overview-card p { font-size: 15px; color: var(--text-secondary); line-height: 1.7; }
.capabilities { background: var(--bg-primary); max-width: 1280px; margin: 0 auto; padding: 120px 40px; }
.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
.grid-card { background: var(--bg-primary); padding: 32px 28px; transition: all 0.4s; cursor: default; }
.grid-card:hover { background: var(--bg-secondary); transform: translateY(-2px); }
.grid-icon { width: 40px; height: 40px; margin-bottom: 20px; color: var(--text-tertiary); transition: all 0.3s; }
.grid-card:hover .grid-icon { color: var(--text-primary); transform: scale(1.1); }
.grid-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 12px; letter-spacing: -0.01em; }
.grid-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }
.ai-layer { background: var(--bg-secondary); }
.ai-layer .section-header { margin-bottom: 64px; }
.ai-features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px; max-width: 1100px; margin: 0 auto; background: var(--border); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
.ai-feature { background: var(--bg-secondary); padding: 40px 32px; transition: all 0.4s; }
.ai-feature:hover { background: var(--bg-tertiary); }
.ai-feature-icon { width: 36px; height: 36px; color: var(--text-tertiary); margin-bottom: 20px; transition: all 0.3s; }
.ai-feature:hover .ai-feature-icon { color: var(--text-primary); transform: scale(1.15); }
.ai-feature h3 { font-size: 16px; font-weight: 600; margin-bottom: 12px; }
.ai-feature p { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }
.demo-engine { background: var(--bg-primary); max-width: 1280px; margin: 0 auto; padding: 120px 40px; }
.demo-container { max-width: 520px; margin: 0 auto; }
.demo-chat { border: 1px solid var(--border); border-radius: 12px; overflow: hidden; background: var(--bg-secondary); }
.demo-chat-header { display: flex; align-items: center; gap: 12px; padding: 16px 20px; border-bottom: 1px solid var(--border); background: var(--bg-tertiary); }
.demo-chat-avatar { width: 36px; height: 36px; background: var(--text-primary); color: var(--bg-primary); font-size: 14px; font-weight: 800; border-radius: 50%; display: flex; align-items: center; justify-content: center; }
.demo-chat-name { font-size: 14px; font-weight: 600; }
.demo-chat-status { font-size: 11px; color: var(--text-tertiary); }
.demo-chat-messages { padding: 24px 20px; min-height: 200px; max-height: 400px; overflow-y: auto; }
.message { margin-bottom: 16px; display: flex; }
.message-bot { justify-content: flex-start; }
.message-user { justify-content: flex-end; }
.message-bubble { max-width: 85%; padding: 12px 16px; border-radius: 12px; font-size: 14px; line-height: 1.6; }
.message-bot .message-bubble { background: var(--bg-tertiary); border: 1px solid var(--border); border-bottom-left-radius: 4px; color: var(--text-secondary); }
.message-user .message-bubble { background: var(--text-primary); color: var(--bg-primary); border-bottom-right-radius: 4px; }
.demo-chat-input { display: flex; padding: 12px 16px; border-top: 1px solid var(--border); background: var(--bg-tertiary); }
.demo-chat-input input { flex: 1; background: transparent; border: none; outline: none; color: var(--text-primary); font-size: 14px; font-family: var(--font); padding: 8px 4px; }
.demo-chat-input input::placeholder { color: var(--text-tertiary); }
.demo-send-btn { width: 36px; height: 36px; background: transparent; border: 1px solid var(--border-light); border-radius: 8px; color: var(--text-tertiary); cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.2s; flex-shrink: 0; }
.demo-send-btn:hover { border-color: var(--hover); color: var(--text-primary); background: var(--hover-bg); }
.demo-send-btn svg { width: 16px; height: 16px; }
.demo-result { text-align: center; padding: 48px 24px; animation: fadeUp 0.5s ease-out; }
.demo-result-icon { width: 56px; height: 56px; margin: 0 auto 24px; background: var(--bg-tertiary); border: 1px solid var(--border); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--text-tertiary); }
.demo-result h3 { font-size: 22px; font-weight: 600; margin-bottom: 12px; }
.demo-result p { font-size: 14px; color: var(--text-secondary); margin-bottom: 24px; line-height: 1.6; }
.demo-result-note { font-size: 12px !important; color: var(--text-tertiary) !important; margin-top: 16px !important; }
.footer { background: var(--bg-secondary); border-top: 1px solid var(--border); padding: 80px 24px 32px; }
.footer-inner { max-width: 1280px; margin: 0 auto; }
.footer-top { display: grid; grid-template-columns: 2fr 3fr; gap: 80px; margin-bottom: 60px; }
.footer-brand p { font-size: 14px; color: var(--text-tertiary); margin-top: 12px; }
.footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.footer-col h4 { font-size: 12px; font-weight: 600; color: var(--text-tertiary); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 16px; }
.footer-col a { display: block; font-size: 14px; color: var(--text-secondary); text-decoration: none; margin-bottom: 10px; transition: color 0.2s; }
.footer-col a:hover { color: var(--text-primary); }
.footer-bottom { border-top: 1px solid var(--border); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; }
.footer-bottom p { font-size: 13px; color: var(--text-tertiary); }
.footer-tagline { font-style: italic; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
@media (max-width: 1024px) {
    .overview { grid-template-columns: 1fr; gap: 48px; padding: 80px 24px; }
    .overview-sticky { position: static; }
    .grid { grid-template-columns: repeat(2, 1fr); }
    .ai-features { grid-template-columns: repeat(2, 1fr); }
    .partner { padding: 80px 24px; }
    .partner-grid { grid-template-columns: 1fr; gap: 20px; }
}
@media (max-width: 768px) {
    .nav-links a:not(.nav-cta) { display: none; }
    .grid { grid-template-columns: 1fr; }
    .ai-features { grid-template-columns: 1fr; }
    .footer-top { grid-template-columns: 1fr; gap: 40px; }
    .footer-links { grid-template-columns: repeat(2, 1fr); }
    .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
    section { padding: 80px 16px; }
    .partner { padding: 80px 16px; }
    .partner-card { padding: 28px 24px; }
    .partner-cta { padding: 32px 24px; }
    .capabilities, .demo-engine { padding: 80px 16px;}
}
@media (max-width: 480px) {
    .footer-links { grid-template-columns: 1fr; }
    .hero-actions { flex-direction: column; align-items: center; }
}