/* ===== Variables ===== */
:root {
    --bg: #0a0a0f;
    --bg-card: #12121a;
    --bg-card-hover: #1a1a25;
    --bg-code: #0d0d14;
    --text: #e4e4ef;
    --text-muted: #8888a0;
    --primary: #6c5ce7;
    --primary-light: #a29bfe;
    --accent: #00cec9;
    --accent-green: #00b894;
    --accent-orange: #fdcb6e;
    --border: #1e1e2e;
    --radius: 12px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--primary-light); text-decoration: none; }
a:hover { color: var(--accent); }

/* ===== Layout ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 100px 0; }
.section-dark { background: var(--bg-card); }
.section-header { text-align: center; margin-bottom: 60px; }
.section-header h2 { font-size: 2.5rem; font-weight: 800; margin-bottom: 16px; letter-spacing: -0.02em; }
.section-header p { font-size: 1.125rem; color: var(--text-muted); max-width: 600px; margin: 0 auto; }

/* ===== Nav ===== */
.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    padding: 16px 0;
    transition: all 0.3s;
}
.nav.scrolled {
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 10px 0;
}
.nav-inner {
    max-width: 1200px; margin: 0 auto; padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
    font-size: 1.5rem; font-weight: 800; color: var(--text);
    letter-spacing: -0.02em;
}
.nav-logo span { color: var(--primary-light); }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { color: var(--text-muted); font-size: 0.9rem; font-weight: 500; transition: color 0.2s; }
.nav-links a:hover { color: var(--text); }
.nav-gh { display: flex; align-items: center; }

/* ===== Hero ===== */
.hero {
    position: relative;
    padding: 180px 0 100px;
    text-align: center;
    overflow: hidden;
}
.hero-glow {
    position: absolute;
    top: -200px; left: 50%; transform: translateX(-50%);
    width: 800px; height: 600px;
    background: radial-gradient(ellipse, rgba(108, 92, 231, 0.15) 0%, transparent 70%);
    pointer-events: none;
}
.hero h1 {
    font-size: 4rem; font-weight: 800; line-height: 1.1;
    letter-spacing: -0.03em; margin-bottom: 24px;
}
.gradient-text {
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-badge {
    display: inline-block;
    padding: 6px 16px; border-radius: 100px;
    background: rgba(108, 92, 231, 0.15);
    border: 1px solid rgba(108, 92, 231, 0.3);
    color: var(--primary-light);
    font-size: 0.8rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: 0.05em;
    margin-bottom: 24px;
}
.hero-sub {
    font-size: 1.2rem; color: var(--text-muted);
    max-width: 680px; margin: 0 auto 40px; line-height: 1.7;
}
.hero-sub strong { color: var(--text); }
.hero-actions { display: flex; gap: 16px; justify-content: center; margin-bottom: 40px; }

/* ===== Buttons ===== */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 28px; border-radius: 10px;
    font-size: 0.95rem; font-weight: 600;
    transition: all 0.2s; cursor: pointer; border: none;
}
.btn-primary {
    background: var(--primary); color: #fff;
}
.btn-primary:hover { background: #7c6ef0; color: #fff; transform: translateY(-1px); }
.btn-outline {
    background: transparent; color: var(--text);
    border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--text-muted); color: var(--text); transform: translateY(-1px); }

/* ===== Install bar ===== */
.hero-install {
    display: inline-flex; align-items: center; gap: 12px;
    background: var(--bg-card); border: 1px solid var(--border);
    padding: 12px 20px; border-radius: 10px;
}
.hero-install code {
    font-family: var(--mono); font-size: 0.95rem; color: var(--accent);
}
.copy-btn {
    background: none; border: none; color: var(--text-muted);
    cursor: pointer; padding: 4px; transition: color 0.2s;
}
.copy-btn:hover { color: var(--text); }

/* ===== Grid ===== */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
@media (max-width: 900px) { .grid-3 { grid-template-columns: 1fr; } }
@media (max-width: 700px) { .grid-2 { grid-template-columns: 1fr; } }

/* ===== Cards ===== */
.card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 28px;
    transition: all 0.3s;
}
.card:hover {
    border-color: rgba(108, 92, 231, 0.3);
    background: var(--bg-card-hover);
    transform: translateY(-2px);
}
.card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 10px; }
.card p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.6; }

/* Protocol cards */
.card-icon {
    display: inline-flex; align-items: center; justify-content: center;
    width: 48px; height: 48px; border-radius: 10px;
    font-size: 0.85rem; font-weight: 800; margin-bottom: 16px;
    font-family: var(--mono);
}
.card-icon-http { background: rgba(108, 92, 231, 0.15); color: var(--primary-light); }
.card-icon-mcp { background: rgba(0, 206, 201, 0.15); color: var(--accent); }
.card-icon-a2a { background: rgba(253, 203, 110, 0.15); color: var(--accent-orange); }
.card-tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 16px 0; }
.card-tags span {
    padding: 3px 10px; border-radius: 6px;
    background: rgba(255, 255, 255, 0.05);
    font-size: 0.75rem; color: var(--text-muted);
}
.card-endpoints { margin-top: 12px; }
.card-endpoints code {
    display: block; font-family: var(--mono);
    font-size: 0.8rem; color: var(--accent-green);
    padding: 2px 0;
}

/* Feature cards */
.feature-icon {
    font-size: 1.8rem; margin-bottom: 12px;
}

/* ===== Video ===== */
.video-container {
    margin: 0 auto 60px; max-width: 960px;
    border-radius: var(--radius); overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}
.studio-video {
    width: 100%; display: block;
}

/* ===== Code blocks ===== */
.code-block {
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px;
    overflow-x: auto;
    font-family: var(--mono);
    font-size: 0.82rem;
    line-height: 1.7;
    color: var(--text);
}
.code-block .kw { color: #c792ea; }
.code-block .str { color: #c3e88d; }
.code-block .val { color: #f78c6c; }
.code-block .fn { color: #82aaff; }
.code-block .dec { color: #ffcb6b; }
.code-block .cmt { color: #546e7a; }

.code-section { max-width: 600px; margin: 60px auto 0; text-align: left; }
.code-section h3 { font-size: 1.2rem; margin-bottom: 16px; text-align: center; }

/* ===== Tabs ===== */
.tabs {
    display: flex; flex-wrap: wrap; gap: 8px;
    justify-content: center; margin-bottom: 32px;
}
.tab {
    padding: 8px 20px; border-radius: 8px;
    background: var(--bg-card); border: 1px solid var(--border);
    color: var(--text-muted); font-size: 0.85rem; font-weight: 600;
    cursor: pointer; transition: all 0.2s;
    font-family: var(--font);
}
.tab:hover { border-color: var(--primary); color: var(--text); }
.tab.active {
    background: var(--primary); border-color: var(--primary);
    color: #fff;
}
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ===== Examples ===== */
.example-split {
    display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
}
@media (max-width: 900px) { .example-split { grid-template-columns: 1fr; } }
.example-panel-full { grid-column: 1 / -1; }
.example-label {
    font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 0.06em; color: var(--primary-light);
    margin-bottom: 10px;
}

/* ===== Footer ===== */
.footer {
    padding: 60px 0; border-top: 1px solid var(--border);
    text-align: center;
}
.footer-inner { max-width: 500px; margin: 0 auto; }
.footer-logo {
    font-size: 1.5rem; font-weight: 800; margin-bottom: 8px;
}
.footer-logo span { color: var(--primary-light); }
.footer p { color: var(--text-muted); font-size: 0.9rem; }
.footer-links {
    display: flex; justify-content: center; gap: 24px;
    margin: 20px 0; flex-wrap: wrap;
}
.footer-links a { color: var(--text-muted); font-size: 0.85rem; }
.footer-links a:hover { color: var(--text); }
.footer-copy { margin-top: 16px; font-size: 0.8rem; color: var(--text-muted); opacity: 0.6; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .hero-sub { font-size: 1rem; }
    .section { padding: 60px 0; }
    .section-header h2 { font-size: 2rem; }
    .nav-links a:not(.nav-gh) { display: none; }
}