/* ============================================
   DESIGN SYSTEM — Variables & Tokens
   ============================================ */

:root {
    /* Colors — Light */
    --c-bg: #f7f6f3;
    --c-bg-alt: #efeee9;
    --c-surface: #ffffff;
    --c-surface-hover: #fafaf8;
    --c-border: rgba(0, 0, 0, 0.07);
    --c-border-strong: rgba(0, 0, 0, 0.12);
    --c-text: #1a1a1a;
    --c-text-2: #555550;
    --c-text-3: #8a8a82;
    --c-accent: #8b7355;
    --c-accent-soft: rgba(139, 115, 85, 0.09);
    --c-accent-text: #6b5a42;
    --c-badge-production: #1a7a3a;
    --c-badge-production-bg: rgba(26, 122, 58, 0.1);
    --c-badge-enterprise: #2563aa;
    --c-badge-enterprise-bg: rgba(37, 99, 170, 0.1);
    --c-badge-ai: #b45309;
    --c-badge-ai-bg: rgba(180, 83, 9, 0.1);
    --c-badge-open: #7c3aed;
    --c-badge-open-bg: rgba(124, 58, 237, 0.1);
    --c-badge-realtime: #0891b2;
    --c-badge-realtime-bg: rgba(8, 145, 178, 0.1);
    --c-badge-auto: #9333ea;
    --c-badge-auto-bg: rgba(147, 51, 234, 0.1);
    --c-badge-case: #6b7280;
    --c-badge-case-bg: rgba(107, 114, 128, 0.1);
    --c-badge-innov: #dc2626;
    --c-badge-innov-bg: rgba(220, 38, 38, 0.1);
    --c-hero-orb-1: rgba(139, 115, 85, 0.06);
    --c-hero-orb-2: rgba(139, 115, 85, 0.04);
    --c-card-shadow: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.03);
    --c-card-shadow-hover: 0 4px 16px rgba(0,0,0,0.08), 0 8px 32px rgba(0,0,0,0.04);
    --c-nav-bg: rgba(247, 246, 243, 0.85);
    --c-metric-bg: rgba(139, 115, 85, 0.06);

    /* Typography */
    --f-serif: 'Instrument Serif', Georgia, 'Times New Roman', serif;
    --f-sans: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --s-section: clamp(80px, 10vw, 140px);
    --s-container: min(1100px, 100% - 48px);
    --s-gap: clamp(16px, 2vw, 24px);

    /* Borders */
    --radius: 16px;
    --radius-sm: 10px;
    --radius-xs: 6px;
    --radius-pill: 100px;

    /* Motion */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --duration: 0.7s;
    --duration-fast: 0.3s;
}

[data-theme="dark"] {
    --c-bg: #0b0b0b;
    --c-bg-alt: #111111;
    --c-surface: #161616;
    --c-surface-hover: #1c1c1c;
    --c-border: rgba(255, 255, 255, 0.06);
    --c-border-strong: rgba(255, 255, 255, 0.10);
    --c-text: #ededed;
    --c-text-2: #9a9a94;
    --c-text-3: #5a5a56;
    --c-accent: #c9b99a;
    --c-accent-soft: rgba(201, 185, 154, 0.07);
    --c-accent-text: #c9b99a;
    --c-badge-production-bg: rgba(34, 197, 94, 0.1);
    --c-badge-production: #4ade80;
    --c-badge-enterprise-bg: rgba(96, 165, 250, 0.1);
    --c-badge-enterprise: #60a5fa;
    --c-badge-ai-bg: rgba(251, 191, 36, 0.1);
    --c-badge-ai: #fbbf24;
    --c-badge-open-bg: rgba(167, 139, 250, 0.1);
    --c-badge-open: #a78bfa;
    --c-badge-realtime-bg: rgba(34, 211, 238, 0.1);
    --c-badge-realtime: #22d3ee;
    --c-badge-auto-bg: rgba(192, 132, 252, 0.1);
    --c-badge-auto: #c084fc;
    --c-badge-case-bg: rgba(156, 163, 175, 0.1);
    --c-badge-case: #9ca3af;
    --c-badge-innov-bg: rgba(248, 113, 113, 0.1);
    --c-badge-innov: #f87171;
    --c-hero-orb-1: rgba(201, 185, 154, 0.05);
    --c-hero-orb-2: rgba(201, 185, 154, 0.03);
    --c-card-shadow: 0 1px 3px rgba(0,0,0,0.2), 0 4px 12px rgba(0,0,0,0.15);
    --c-card-shadow-hover: 0 8px 30px rgba(0,0,0,0.3);
    --c-nav-bg: rgba(11, 11, 11, 0.85);
    --c-metric-bg: rgba(201, 185, 154, 0.06);
}

/* ============================================
   BASE RESET & GLOBALS
   ============================================ */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--f-sans);
    font-weight: 400;
    color: var(--c-text);
    background: var(--c-bg);
    line-height: 1.65;
    font-size: 16px;
    transition: background-color 0.5s ease, color 0.5s ease;
    overflow-x: hidden;
}

/* Noise texture overlay */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
    opacity: 0.4;
    pointer-events: none;
    z-index: 9999;
    mix-blend-mode: overlay;
}

img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { border: none; background: none; cursor: pointer; font: inherit; color: inherit; }
ul, ol { list-style: none; }

.container {
    width: var(--s-container);
    margin: 0 auto;
}

/* ============================================
   SCROLL PROGRESS BAR
   ============================================ */

.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 2px;
    width: 0%;
    background: var(--c-accent);
    z-index: 10001;
    transition: none;
}

/* ============================================
   NAVIGATION
   ============================================ */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0 24px;
    transition: background-color 0.4s ease, backdrop-filter 0.4s ease, border-color 0.4s ease;
    border-bottom: 1px solid transparent;
}

.site-header.scrolled {
    background: var(--c-nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom-color: var(--c-border);
}

.nav {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    font-family: var(--f-serif);
    font-size: 1.5rem;
    letter-spacing: -0.02em;
    color: var(--c-text);
    transition: opacity 0.2s;
}
.nav-logo:hover { opacity: 0.7; }

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--c-text-2);
    letter-spacing: 0.01em;
    transition: color var(--duration-fast) ease;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1.5px;
    background: var(--c-accent);
    transition: width var(--duration-fast) ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--c-text);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.theme-toggle {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color var(--duration-fast) ease;
}
.theme-toggle:hover { background: var(--c-accent-soft); }
.theme-toggle svg {
    width: 18px;
    height: 18px;
    transition: transform 0.4s var(--ease-spring);
}
.theme-toggle:hover svg { transform: rotate(30deg); }

.sun-icon { display: none; }
.moon-icon { display: block; }
[data-theme="light"] .sun-icon { display: block; }
[data-theme="light"] .moon-icon { display: none; }

.nav-menu-btn {
    display: none;
    width: 36px;
    height: 36px;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
    border-radius: 50%;
    transition: background-color var(--duration-fast) ease;
}
.nav-menu-btn:hover { background: var(--c-accent-soft); }
.nav-menu-btn span {
    display: block;
    width: 18px;
    height: 1.5px;
    background: var(--c-text);
    border-radius: 1px;
    transition: all 0.3s ease;
    transform-origin: center;
}
.nav-menu-btn.active span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-menu-btn.active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-menu-btn.active span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile menu overlay */
.mobile-menu {
    position: fixed;
    inset: 0;
    background: var(--c-bg);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s;
}
.mobile-menu.active {
    opacity: 1;
    visibility: visible;
}
.mobile-menu-inner {
    text-align: center;
}
.mobile-menu-inner a {
    font-family: var(--f-serif);
    font-size: clamp(2rem, 6vw, 3rem);
    display: block;
    padding: 0.4em 0;
    color: var(--c-text);
    transition: color 0.2s, opacity 0.2s;
    opacity: 0;
    transform: translateY(20px);
}
.mobile-menu.active .mobile-menu-inner a {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.4s ease, transform 0.4s var(--ease-out), color 0.2s;
}
.mobile-menu.active .mobile-menu-inner a:nth-child(1) { transition-delay: 0.1s; }
.mobile-menu.active .mobile-menu-inner a:nth-child(2) { transition-delay: 0.15s; }
.mobile-menu.active .mobile-menu-inner a:nth-child(3) { transition-delay: 0.2s; }
.mobile-menu.active .mobile-menu-inner a:nth-child(4) { transition-delay: 0.25s; }
.mobile-menu-inner a:hover { color: var(--c-accent); }

@media (max-width: 640px) {
    .nav-links { display: none; }
    .nav-menu-btn { display: flex; }
}

/* ============================================
   SECTIONS — Common
   ============================================ */

.section {
    padding: var(--s-section) 0;
}

.section-divider {
    width: var(--s-container);
    margin: 0 auto;
    height: 1px;
    background: var(--c-border);
}

.section-label {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--c-accent);
    margin-bottom: 1rem;
    display: block;
}

.section-title {
    font-family: var(--f-serif);
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--c-text-2);
    max-width: 520px;
    line-height: 1.6;
    font-weight: 300;
}

.section-header {
    margin-bottom: clamp(2.5rem, 4vw, 4rem);
}

/* ============================================
   REVEAL ANIMATIONS
   ============================================ */

.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }
.reveal-delay-5 { transition-delay: 0.40s; }
.reveal-delay-6 { transition-delay: 0.48s; }
.reveal-delay-7 { transition-delay: 0.56s; }
.reveal-delay-8 { transition-delay: 0.64s; }

/* ============================================
   BADGES
   ============================================ */

.badge {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 0.3rem 0.7rem;
    border-radius: var(--radius-pill);
}

.badge-production { background: var(--c-badge-production-bg); color: var(--c-badge-production); }
.badge-enterprise { background: var(--c-badge-enterprise-bg); color: var(--c-badge-enterprise); }
.badge-ai { background: var(--c-badge-ai-bg); color: var(--c-badge-ai); }
.badge-open { background: var(--c-badge-open-bg); color: var(--c-badge-open); }
.badge-realtime { background: var(--c-badge-realtime-bg); color: var(--c-badge-realtime); }
.badge-auto { background: var(--c-badge-auto-bg); color: var(--c-badge-auto); }
.badge-case { background: var(--c-badge-case-bg); color: var(--c-badge-case); }
.badge-innov { background: var(--c-badge-innov-bg); color: var(--c-badge-innov); }

/* ============================================
   TECH TAGS & PILLS
   ============================================ */

.tech-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.tech-tag {
    font-size: 0.7rem;
    font-weight: 500;
    padding: 0.3rem 0.65rem;
    border-radius: var(--radius-xs);
    border: 1px solid var(--c-border);
    color: var(--c-text-2);
}

.pill-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.pill-group-label {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--c-text-3);
    margin-bottom: 0.6rem;
    display: block;
    width: 100%;
}

.pill {
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-pill);
    background: var(--c-accent-soft);
    color: var(--c-accent-text);
    white-space: nowrap;
}

/* ============================================
   FEATURES GRID
   ============================================ */

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1px;
    background: var(--c-border);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: 2rem;
}

.feature-item {
    padding: 1.25rem 1.5rem;
    background: var(--c-bg);
}

[data-theme="dark"] .feature-item {
    background: var(--c-surface);
}

.feature-item h4 {
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--c-text);
}

.feature-item p {
    font-size: 0.82rem;
    color: var(--c-text-2);
    line-height: 1.55;
    font-weight: 300;
}

/* ============================================
   METRICS GRID
   ============================================ */

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--s-gap);
    margin-bottom: 2rem;
}

.metric {
    text-align: center;
    padding: 1.25rem;
    background: var(--c-metric-bg);
    border-radius: var(--radius-sm);
}

.metric-number {
    font-family: var(--f-serif);
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    display: block;
    color: var(--c-accent);
    line-height: 1.1;
    margin-bottom: 0.3rem;
}

.metric-label {
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    color: var(--c-text-3);
    text-transform: uppercase;
}

@media (max-width: 480px) {
    .metrics-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================
   FOOTER
   ============================================ */

.site-footer {
    text-align: center;
    padding: 2rem 0;
    border-top: 1px solid var(--c-border);
    margin-top: var(--s-section);
}

.site-footer p {
    font-size: 0.78rem;
    color: var(--c-text-3);
    font-weight: 300;
}

/* ============================================
   UTILITY
   ============================================ */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}