/* ─── TheQuantCloud — Design System (extends shared palette) ─── */

:root {
    --violet-50: #F5F3FF;
    --violet-100: #EDE9FE;
    --violet-200: #DDD6FE;
    --violet-400: #A78BFA;
    --violet-500: #8B5CF6;
    --violet-600: #7C3AED;
    --violet-700: #6D28D9;
    --violet-800: #5B21B6;
    --violet-900: #4C1D95;
    --indigo-500: #6366F1;
    --indigo-600: #4F46E5;
    --amber-400: #FBBF24;
    --amber-500: #F59E0B;
    --gray-50: #FAFAFA;
    --gray-100: #F4F4F5;
    --gray-200: #E4E4E7;
    --gray-300: #D4D4D8;
    --gray-400: #A1A1AA;
    --gray-500: #71717A;
    --gray-600: #52525B;
    --gray-700: #3F3F46;
    --gray-800: #27272A;
    --gray-900: #18181B;
    --gray-950: #09090B;
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1);
    --shadow-glow: 0 0 40px rgba(124,58,237,0.15);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-sans);
    color: var(--gray-800);
    background: white;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ─── Nav (shared) ─── */
.nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(255,255,255,0.85); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid transparent; transition: border-color 0.3s, background 0.3s;
}
.nav.scrolled { border-bottom-color: var(--gray-200); background: rgba(255,255,255,0.95); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.nav-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 700; font-size: 1.15rem; color: var(--gray-900); }
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a { text-decoration: none; color: var(--gray-600); font-weight: 500; font-size: 0.95rem; transition: color 0.2s; }
.nav-links a:hover { color: var(--violet-600); }
.nav-github { display: flex; align-items: center; padding: 8px; border-radius: 8px; transition: background 0.2s; }
.nav-github:hover { background: var(--gray-100); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--gray-700); border-radius: 2px; }

/* ─── Hero ─── */
.hero {
    position: relative; padding: 160px 0 100px; overflow: hidden;
    background: linear-gradient(180deg, var(--violet-50) 0%, white 100%);
}
.hero-bg { position: absolute; inset: 0; overflow: hidden; }
.hero-grid {
    position: absolute; inset: 0;
    background-image: linear-gradient(rgba(124,58,237,0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(124,58,237,0.05) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}
.hero-glow { position: absolute; top: -200px; left: 50%; transform: translateX(-50%); width: 800px; height: 600px; background: radial-gradient(ellipse, rgba(124,58,237,0.12) 0%, transparent 70%); }
.hero-content { position: relative; text-align: center; z-index: 1; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px; padding: 8px 20px;
    background: white; border: 1px solid var(--violet-200); border-radius: 100px;
    font-size: 0.875rem; font-weight: 600; color: var(--violet-700); margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}
.hero h1 { font-size: clamp(2.5rem, 6vw, 4.2rem); font-weight: 800; line-height: 1.1; letter-spacing: -0.03em; color: var(--gray-900); margin-bottom: 20px; }
.gradient-text { background: linear-gradient(135deg, var(--violet-600), var(--indigo-600), var(--violet-500)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-subtitle { font-size: 1.2rem; color: var(--gray-500); max-width: 680px; margin: 0 auto 36px; line-height: 1.7; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 32px; }

/* install bar under hero */
.install-bar {
    display: inline-flex; align-items: center; gap: 12px;
    background: var(--gray-950); border: 1px solid var(--gray-800); border-radius: var(--radius);
    padding: 14px 24px;
}
.install-bar code { font-family: var(--font-mono); font-size: 0.95rem; color: var(--amber-400); }
.install-bar .copy-btn { background: none; border: none; color: var(--gray-400); cursor: pointer; padding: 4px; transition: color 0.2s; }
.install-bar .copy-btn:hover { color: white; }

/* ─── Buttons ─── */
.btn {
    display: inline-flex; align-items: center; gap: 8px; padding: 14px 28px;
    border-radius: var(--radius); font-weight: 600; font-size: 0.95rem;
    text-decoration: none; transition: all 0.2s ease; cursor: pointer; border: none;
}
.btn-primary { background: linear-gradient(135deg, var(--violet-600), var(--indigo-600)); color: white; box-shadow: 0 4px 14px rgba(124,58,237,0.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(124,58,237,0.45); }
.btn-secondary { background: white; color: var(--gray-800); border: 1px solid var(--gray-200); box-shadow: var(--shadow-sm); }
.btn-secondary:hover { background: var(--gray-50); border-color: var(--gray-300); transform: translateY(-1px); }
.btn-outline { background: transparent; color: white; border: 1px solid rgba(255,255,255,0.3); }
.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.5); }

/* ─── Sections ─── */
.section { padding: 100px 0; }
.section-dark { background: var(--gray-950); color: white; }
.section-dark .section-desc { color: var(--gray-400); }
.section-header { text-align: center; margin-bottom: 64px; }
.section-tag { display: inline-block; padding: 4px 16px; background: var(--violet-100); color: var(--violet-700); border-radius: 100px; font-size: 0.8rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 16px; }
.section-dark .section-tag { background: rgba(124,58,237,0.2); color: var(--violet-400); }
.section-header h2 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; letter-spacing: -0.02em; line-height: 1.15; margin-bottom: 16px; }
.section-desc { font-size: 1.1rem; color: var(--gray-500); max-width: 640px; margin: 0 auto; line-height: 1.7; }

/* ─── Features Grid ─── */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}
.feature-card {
    padding: 32px;
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    transition: all 0.3s;
}
.feature-card:hover { border-color: var(--violet-200); box-shadow: var(--shadow-glow); transform: translateY(-4px); }
.feature-card-large { grid-column: span 2; }
.feature-icon { font-size: 2rem; margin-bottom: 16px; }
.feature-icon-lg { font-size: 2.5rem; margin-bottom: 16px; }
.feature-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; color: var(--gray-900); }
.feature-card p { color: var(--gray-500); font-size: 0.95rem; line-height: 1.6; }
.feature-chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.chip {
    padding: 4px 14px; background: var(--violet-50); color: var(--violet-700);
    border-radius: 100px; font-size: 0.8rem; font-weight: 600;
}

/* ─── SDK Showcase ─── */
.sdk-showcase { max-width: 800px; margin: 0 auto; }
.sdk-tabs { display: flex; gap: 8px; margin-bottom: 24px; justify-content: center; flex-wrap: wrap; }
.sdk-tab {
    padding: 10px 24px; border-radius: 100px; border: 1px solid rgba(255,255,255,0.15);
    background: transparent; color: var(--gray-400); font-weight: 600; font-size: 0.9rem;
    cursor: pointer; transition: all 0.2s;
}
.sdk-tab:hover { border-color: rgba(255,255,255,0.3); color: white; }
.sdk-tab.active { background: rgba(124,58,237,0.25); border-color: var(--violet-500); color: white; }
.sdk-panel { display: none; }
.sdk-panel.active { display: block; }

/* ─── Code Block ─── */
.tech-code { background: var(--gray-950); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-xl); border: 1px solid var(--gray-800); }
.code-header { display: flex; align-items: center; gap: 12px; padding: 14px 20px; background: var(--gray-900); border-bottom: 1px solid var(--gray-800); }
.code-dots { display: flex; gap: 8px; }
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.red { background: #FF5F57; } .dot.yellow { background: #FEBC2E; } .dot.green { background: #28C840; }
.code-title { font-family: var(--font-mono); font-size: 0.8rem; color: var(--gray-400); }
.code-block { padding: 24px; font-family: var(--font-mono); font-size: 0.88rem; line-height: 1.8; color: #E4E4E7; overflow-x: auto; }
.code-block .kw { color: #C084FC; }
.code-block .mod { color: #67E8F9; }
.code-block .fn { color: #67E8F9; }
.code-block .str { color: #86EFAC; }
.code-block .num { color: var(--amber-400); }
.code-block .cmt { color: #71717A; font-style: italic; }

/* ─── Backends ─── */
.backends-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px; }
.backend-card {
    padding: 32px; background: white; border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg); text-align: center; transition: all 0.3s;
}
.backend-card:hover { border-color: var(--violet-200); box-shadow: var(--shadow-glow); transform: translateY(-4px); }
.backend-icon { font-size: 2rem; margin-bottom: 16px; display: flex; justify-content: center; }
.backend-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; }
.backend-card p { color: var(--gray-500); font-size: 0.9rem; line-height: 1.6; margin-bottom: 16px; }
.backend-status {
    display: inline-block; padding: 4px 14px; border-radius: 100px;
    font-size: 0.8rem; font-weight: 600;
}
.backend-status.available { background: rgba(34,197,94,0.1); color: #22C55E; }
.backend-status.coming { background: rgba(251,191,36,0.1); color: var(--amber-500); }

/* ─── Docs Grid ─── */
.docs-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.doc-card {
    display: block; padding: 32px; background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1); border-radius: var(--radius-lg);
    text-decoration: none; color: white; transition: all 0.3s;
}
.doc-card:hover { border-color: rgba(124,58,237,0.3); background: rgba(255,255,255,0.08); transform: translateY(-2px); }
.doc-icon { font-size: 1.8rem; margin-bottom: 12px; }
.doc-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 6px; }
.doc-card p { color: var(--gray-400); font-size: 0.9rem; line-height: 1.6; }

/* ─── Pricing ─── */
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 32px; max-width: 800px; margin: 0 auto; }
.pricing-card {
    padding: 40px; background: white; border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl); transition: all 0.3s;
}
.pricing-card:hover { box-shadow: var(--shadow-lg); }
.pricing-card-featured { border-color: var(--violet-300); box-shadow: var(--shadow-glow); position: relative; }
.pricing-card-featured::before {
    content: '★ Recommended'; position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
    padding: 4px 16px; background: linear-gradient(135deg, var(--violet-600), var(--indigo-600));
    color: white; border-radius: 100px; font-size: 0.75rem; font-weight: 600;
}
.pricing-tier { font-size: 0.85rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--violet-600); margin-bottom: 12px; }
.pricing-price { margin-bottom: 12px; }
.price-amount { font-size: 2.2rem; font-weight: 800; color: var(--gray-900); }
.price-period { font-size: 1rem; color: var(--gray-500); margin-left: 4px; }
.pricing-desc { color: var(--gray-500); font-size: 0.95rem; margin-bottom: 24px; line-height: 1.5; }
.pricing-features { list-style: none; margin-bottom: 28px; }
.pricing-features li { padding: 6px 0; color: var(--gray-600); font-size: 0.95rem; }
.pricing-features li::first-letter { color: var(--violet-500); }

/* ─── CTA ─── */
.cta-section { padding: 80px 0; }
.cta-inner {
    text-align: center; padding: 80px 48px;
    background: linear-gradient(135deg, var(--gray-950), #1E1B4B);
    border-radius: var(--radius-xl); color: white; position: relative; overflow: hidden;
}
.cta-inner::before { content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%; background: radial-gradient(ellipse at 60% 40%, rgba(124,58,237,0.15) 0%, transparent 60%); }
.cta-inner h2 { font-size: clamp(1.8rem, 3.5vw, 2.5rem); font-weight: 800; margin-bottom: 12px; position: relative; }
.cta-inner p { color: var(--gray-400); margin-bottom: 28px; position: relative; }
.cta-install { display: inline-flex; align-items: center; gap: 12px; background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.15); border-radius: var(--radius); padding: 14px 24px; margin-bottom: 28px; position: relative; }
.cta-install code { font-family: var(--font-mono); font-size: 1rem; color: var(--amber-400); }
.copy-btn { background: none; border: none; color: var(--gray-400); cursor: pointer; padding: 4px; transition: color 0.2s; }
.copy-btn:hover { color: white; }
.cta-actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; position: relative; }

/* ─── Footer ─── */
.footer { background: var(--gray-950); color: var(--gray-400); padding: 64px 0 32px; border-top: 1px solid rgba(255,255,255,0.06); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 48px; }
.footer-brand { display: flex; flex-direction: column; gap: 8px; }
.footer-brand span { font-weight: 700; font-size: 1.1rem; color: white; }
.footer-brand p { font-size: 0.9rem; line-height: 1.6; }
.footer-col h5 { color: white; font-size: 0.85rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 16px; }
.footer-col a { display: block; color: var(--gray-400); text-decoration: none; font-size: 0.9rem; padding: 4px 0; transition: color 0.2s; }
.footer-col a:hover { color: white; }
.footer-bottom { display: flex; justify-content: space-between; padding-top: 24px; border-top: 1px solid rgba(255,255,255,0.06); font-size: 0.85rem; color: var(--gray-500); }

/* ─── Responsive ─── */
@media (max-width: 900px) {
    .feature-card-large { grid-column: span 1; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 640px) {
    .nav-links { display: none; }
    .nav-links.open {
        display: flex; flex-direction: column; position: absolute; top: 72px; left: 0; right: 0;
        background: white; padding: 24px; border-bottom: 1px solid var(--gray-200); gap: 16px; box-shadow: var(--shadow-lg);
    }
    .nav-toggle { display: flex; }
    .hero { padding: 120px 0 60px; }
    .section { padding: 64px 0; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
    .pricing-grid { grid-template-columns: 1fr; }
}