:root {
    --color-bg: #FAFAF8;
    --color-surface: #FFFFFF;
    --color-surface-alt: #F3F2EE;
    --color-border: #E2E0D8;
    --color-border-light: #EDECE6;
    --color-text-primary: #1A1A18;
    --color-text-secondary: #5C5B56;
    --color-text-tertiary: #8E8D87;
    --color-accent: #1B3A4B;
    --color-accent-light: #2A5A72;
    --color-accent-subtle: #E8F0F4;
    --color-highlight: #C4975A;
    --color-highlight-subtle: #F8F2E8;
    --font-display: 'DM Serif Display', Georgia, serif;
    --font-body: 'DM Sans', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --font-cn: 'Noto Sans SC', sans-serif;
    --max-width: 1200px;
    --nav-height: 72px;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

/* ─── NAV ─── */
nav { position: fixed; top: 0; left: 0; right: 0; height: var(--nav-height); background: rgba(250,250,248,0.92); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); border-bottom: 1px solid var(--color-border-light); z-index: 100; transition: box-shadow 0.3s ease; }
nav.scrolled { box-shadow: 0 1px 20px rgba(0,0,0,0.06); }
.nav-inner { max-width: var(--max-width); margin: 0 auto; padding: 0 40px; height: 100%; display: flex; align-items: center; justify-content: space-between; }
.nav-logo { display: flex; align-items: center; gap: 14px; text-decoration: none; color: var(--color-text-primary); }
.nav-logo-mark { width: 36px; height: 36px; background: var(--color-accent); border-radius: 8px; display: flex; align-items: center; justify-content: center; color: white; font-family: var(--font-display); font-size: 18px; letter-spacing: -0.5px; }
.nav-logo-img { height: 32px; width: auto; }
.nav-logo-text { font-family: var(--font-display); font-size: 20px; letter-spacing: -0.3px; }
.nav-links { display: flex; align-items: center; gap: 36px; list-style: none; }
.nav-links a { text-decoration: none; color: var(--color-text-secondary); font-size: 14px; font-weight: 500; letter-spacing: 0.3px; text-transform: uppercase; transition: color 0.2s; position: relative; }
.nav-links a::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 1.5px; background: var(--color-accent); transition: width 0.3s ease; }
.nav-links a:hover { color: var(--color-accent); }
.nav-links a:hover::after { width: 100%; }
.nav-links a.active { color: var(--color-accent); }
.nav-links a.active::after { width: 100%; }
.nav-contact-btn { background: var(--color-accent); color: white !important; padding: 10px 24px; border-radius: 6px; font-size: 13px !important; letter-spacing: 0.5px; transition: background 0.2s, transform 0.2s !important; }
.nav-contact-btn::after { display: none !important; }
.nav-contact-btn:hover { background: var(--color-accent-light) !important; transform: translateY(-1px); }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--color-text-primary); margin: 5px 0; transition: 0.3s; }

/* ─── COMMON ─── */
.section-label { font-family: var(--font-mono); font-size: 11px; color: var(--color-highlight); letter-spacing: 2.5px; text-transform: uppercase; margin-bottom: 20px; }
.section-title { font-family: var(--font-display); font-size: clamp(28px, 3.5vw, 42px); line-height: 1.2; letter-spacing: -0.8px; color: var(--color-text-primary); max-width: 650px; margin-bottom: 60px; }
.page-header { padding: calc(var(--nav-height) + 80px) 40px 60px; max-width: var(--max-width); margin: 0 auto; }
.page-header h1 { font-family: var(--font-display); font-size: clamp(36px, 4.5vw, 56px); line-height: 1.15; letter-spacing: -1px; max-width: 700px; }
.page-header-desc { font-size: 18px; color: var(--color-text-secondary); max-width: 600px; margin-top: 24px; font-weight: 300; line-height: 1.8; }

/* ─── BUTTONS ─── */
.btn-primary { display: inline-flex; align-items: center; gap: 8px; background: var(--color-accent); color: white; padding: 14px 32px; border-radius: 6px; text-decoration: none; font-size: 14px; font-weight: 600; letter-spacing: 0.3px; transition: all 0.25s ease; }
.btn-primary:hover { background: var(--color-accent-light); transform: translateY(-2px); box-shadow: 0 4px 16px rgba(27,58,75,0.2); }
.btn-secondary { display: inline-flex; align-items: center; gap: 8px; background: transparent; color: var(--color-accent); padding: 14px 32px; border-radius: 6px; text-decoration: none; font-size: 14px; font-weight: 600; letter-spacing: 0.3px; border: 1.5px solid var(--color-border); transition: all 0.25s ease; }
.btn-secondary:hover { border-color: var(--color-accent); background: var(--color-accent-subtle); transform: translateY(-2px); }

/* ─── ARROW SVG (reusable) ─── */
.arrow-right { width: 16px; height: 16px; }
.arrow-ext { width: 14px; height: 14px; }

/* ─── FOOTER ─── */
footer { border-top: 1px solid var(--color-border-light); padding: 60px 40px; background: var(--color-surface); }
.footer-inner { max-width: var(--max-width); margin: 0 auto; display: flex; justify-content: space-between; align-items: flex-start; }
.footer-logo { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; text-decoration: none; color: var(--color-text-primary); }
.footer-logo .nav-logo-mark { width: 30px; height: 30px; font-size: 15px; border-radius: 6px; }
.footer-logo-text { font-family: var(--font-display); font-size: 17px; }
.footer-logo-img { height: 26px; width: auto; }
.footer-tagline { font-size: 13px; color: var(--color-text-tertiary); margin-bottom: 20px; max-width: 300px; line-height: 1.7; }
.footer-copy { font-size: 12px; color: var(--color-text-tertiary); }
.footer-links { display: flex; gap: 60px; }
.footer-col h5 { font-size: 12px; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; color: var(--color-text-tertiary); margin-bottom: 16px; }
.footer-col a { display: block; font-size: 14px; color: var(--color-text-secondary); text-decoration: none; margin-bottom: 10px; transition: color 0.2s; }
.footer-col a:hover { color: var(--color-accent); }

/* ─── ANIMATIONS ─── */
@keyframes fadeUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
.reveal { opacity: 0; transform: translateY(30px); transition: all 0.7s cubic-bezier(0.22, 1, 0.36, 1); }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ─── RESPONSIVE ─── */
@media (max-width: 960px) {
    .footer-inner { flex-direction: column; gap: 40px; }
}
@media (max-width: 640px) {
    .nav-inner { padding: 0 24px; }
    .nav-links { display: none; }
    .nav-links.open { display: flex; flex-direction: column; position: absolute; top: var(--nav-height); left: 0; right: 0; background: var(--color-bg); padding: 24px; border-bottom: 1px solid var(--color-border-light); gap: 20px; }
    .nav-toggle { display: block; }
    footer { padding: 40px 24px; }
}