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

:root {
  --font: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 8px;
}

[data-theme="light"] {
  --bg: #faf9f7;
  --bg-card: #ffffff;
  --bg-card-alt: #f5f4f2;
  --bg-code: #1a1a2e;
  --border: rgba(0,0,0,0.07);
  --border-strong: rgba(0,0,0,0.12);
  --text: #0f0f0f;
  --text-secondary: #5c5c5c;
  --text-muted: #9a9a9a;
  --accent: #E8342E;
  --accent-hover: #cc2c27;
  --accent-soft: rgba(232,52,46,0.07);
  --gradient-1: #f97316;
  --gradient-2: #ec4899;
  --gradient-3: #8b5cf6;
  --gradient-4: #3b82f6;
  --gradient-5: #06b6d4;
  --nav-bg: rgba(250,249,247,0.85);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.08);
}

[data-theme="dark"] {
  --bg: #0a0a0f;
  --bg-card: #141419;
  --bg-card-alt: #1a1a21;
  --bg-code: #0d0d15;
  --border: rgba(255,255,255,0.06);
  --border-strong: rgba(255,255,255,0.1);
  --text: #f0f0f0;
  --text-secondary: #a0a0a0;
  --text-muted: #606060;
  --accent: #f25550;
  --accent-hover: #E8342E;
  --accent-soft: rgba(242,85,80,0.1);
  --gradient-1: #f97316;
  --gradient-2: #ec4899;
  --gradient-3: #8b5cf6;
  --gradient-4: #3b82f6;
  --gradient-5: #06b6d4;
  --nav-bg: rgba(10,10,15,0.85);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.3);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.4);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background 0.4s, color 0.3s;
}

/* ─── NAV ─── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  backdrop-filter: blur(24px) saturate(1.5);
  -webkit-backdrop-filter: blur(24px) saturate(1.5);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1180px; margin: 0 auto;
  padding: 0 24px; height: 60px;
  display: flex; align-items: center; justify-content: space-between;
}

.nav-logo {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; color: var(--text);
  font-weight: 700; font-size: 18px;
}

.nav-logo svg { width: 28px; height: 28px; }
.logo-img {
  width: 32px; height: 32px;
}

.nav-links { display: flex; gap: 28px; }
.nav-links a {
  font-size: 14px; font-weight: 500; color: var(--text-secondary);
  text-decoration: none; transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }

.nav-right { display: flex; align-items: center; gap: 12px; }

.theme-toggle {
  background: none; border: none; cursor: pointer; padding: 6px;
  color: var(--text-secondary); display: flex; align-items: center;
  border-radius: 8px; transition: all 0.2s;
}
.theme-toggle:hover { background: var(--accent-soft); color: var(--text); }
.theme-toggle svg { width: 18px; height: 18px; }

.btn {
  font-family: var(--font); font-size: 14px; font-weight: 600;
  border-radius: var(--radius-xs); text-decoration: none;
  cursor: pointer; transition: all 0.2s var(--ease);
  display: inline-flex; align-items: center; gap: 8px; border: none;
}

.btn-primary {
  padding: 10px 22px;
  color: #fff; background: var(--accent);
  box-shadow: 0 4px 24px rgba(232,52,46,0.3);
}
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); box-shadow: 0 8px 32px rgba(232,52,46,0.4); }

.btn-hero {
  font-family: var(--font); font-size: 16px; font-weight: 600;
  padding: 14px 32px; border-radius: 12px; cursor: pointer;
  text-decoration: none; transition: all 0.25s var(--ease);
  display: inline-flex; align-items: center; gap: 8px; border: none;
}

.btn-hero-primary {
  background: var(--accent); color: #fff;
  box-shadow: 0 4px 24px rgba(232,52,46,0.3);
}
.btn-hero-primary:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 8px 32px rgba(232,52,46,0.4); }

/* ─── FOOTER ─── */
footer {
  max-width: 1180px; margin: 100px auto 0;
  padding: 32px 24px;
  border-top: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  color: var(--text-muted); font-size: 13px;
}
footer a { color: var(--text-secondary); text-decoration: none; }
footer a:hover { color: var(--text); }
.footer-links { display: flex; gap: 24px; }

/* ─── ANIMATIONS ─── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(28px); }
  to { opacity: 1; transform: translateY(0); }
}

.anim { opacity: 0; transform: translateY(28px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.anim.visible { opacity: 1; transform: translateY(0); }

/* ─── RESPONSIVE ─── */
@media (max-width: 900px) {
  .nav-links { display: none; }
}

@media (max-width: 640px) {
  .nav-inner { height: 54px; padding: 0 16px; }
  .nav-logo { font-size: 16px; gap: 8px; }
  .nav-logo svg { width: 24px; height: 24px; }
  .btn-primary { padding: 8px 16px; font-size: 13px; }
  .theme-toggle { padding: 4px; }
  footer { flex-direction: column; gap: 16px; text-align: center; padding: 28px 16px; margin-top: 60px; }
  .footer-links { gap: 16px; }
}