:root {
  /* COLOR PALETTE — Light blue-white base, matched to HEXA logo brand (#4D7DFF gradient) */
  --bg: #F5F8FF;
  --bg-secondary: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-elevated: #EDF2FC;
  --bg-dark: #0A101E;
  --bg-darker: #070C18;

  --text: #0F1B3D;
  --text-secondary: #47536B;
  --text-muted: #7A86A3;
  --text-light: #F4F7FF;

  --blue-electric: #4D7DFF;
  --blue-electric-hover: #3A63E8;
  --blue-electric-dark: #4D7DFF;
  --blue-electric-dark-hover: #3A68E6;
  --blue: #5E7BFF;
  --blue-hover: #4A66E8;
  --blue-light: #8AA0FF;
  --blue-subtle: rgba(94, 123, 255, 0.1);

  --purple: #7C5CE0;
  --cyan: #12A5C8;

  --border: rgba(15, 27, 61, 0.12);
  --border-light: rgba(15, 27, 61, 0.06);
  --border-dark: rgba(0, 0, 0, 0.5);

  --success: #34D399;
  --warning: #FBBF24;
  --error: #F87171;

  /* TYPOGRAPHY */
  --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Space Grotesk', 'IBM Plex Sans', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --text-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.8rem);
  --text-sm: clamp(0.8rem, 0.75rem + 0.25vw, 0.875rem);
  --text-base: clamp(0.95rem, 0.9rem + 0.25vw, 1.05rem);
  --text-lg: clamp(1.05rem, 1rem + 0.5vw, 1.2rem);
  --text-xl: clamp(1.2rem, 1.1rem + 0.75vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.3rem + 1.5vw, 2.2rem);
  --text-3xl: clamp(2rem, 1.6rem + 2.5vw, 3.2rem);
  --text-4xl: clamp(2.5rem, 2rem + 4vw, 4.5rem);
  --text-hero: clamp(2.8rem, 2.2rem + 5vw, 5.5rem);

  --leading-tight: 1.05;
  --leading-snug: 1.15;
  --leading-normal: 1.5;
  --leading-relaxed: 1.7;

  --tracking-tight: -0.03em;
  --tracking-snug: -0.01em;
  --tracking-normal: 0;
  --tracking-wide: 0.02em;
  --tracking-wider: 0.05em;
  --tracking-widest: 0.1em;

  /* SPACING (4px base) */
  --space-0: 0;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-14: 56px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  --space-32: 128px;

  /* BORDER RADIUS */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* SHADOWS & GLOW */
  --shadow-sm: 0 1px 2px rgba(15, 27, 61, 0.06);
  --shadow-md: 0 2px 12px rgba(15, 27, 61, 0.08);
  --shadow-lg: 0 4px 24px rgba(15, 27, 61, 0.12);
  --shadow-xl: 0 8px 40px rgba(15, 27, 61, 0.16);
  --glow-blue: 0 0 24px rgba(94, 123, 255, 0.18);
  --glow-blue-strong: 0 0 40px rgba(94, 123, 255, 0.3);
  --glow-blue-electric: 0 0 24px rgba(77, 125, 255, 0.25);

  /* Z-INDEX */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-header: 500;
  --z-overlay: 800;
  --z-modal: 900;
  --z-cookie: 9999;

  /* TRANSITIONS */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.2s var(--ease-out);
  --transition-base: 0.3s var(--ease-in-out);
  --transition-slow: 0.5s var(--ease-out);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  /* GRADIENTS */
  --gradient-primary: linear-gradient(135deg, #6E96FF, #4D7DFF);
  --gradient-accent: linear-gradient(135deg, #4D7DFF, #6E96FF);
  --accent-gradient: linear-gradient(135deg, #6E96FF, #4D7DFF, #2F55D4);
  --gradient-mesh: linear-gradient(135deg, rgba(77, 125, 255, 0.16), rgba(110, 150, 255, 0.1), rgba(47, 85, 212, 0.08));
  --gradient-hero: radial-gradient(ellipse at 50% 50%, rgba(77, 125, 255, 0.14) 0%, rgba(110, 150, 255, 0.06) 30%, transparent 70%);

  /* GLASSMORPHISM */
  --glass-bg: rgba(255, 255, 255, 0.62);
  --glass-bg-light: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(15, 27, 61, 0.1);
  --glass-blur: 16px;
}

/* TikTok icon: black in light mode, white in dark */
@media (prefers-color-scheme: light) {
  .fa-tiktok { color: #000 !important; }
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0B0F1A;
    --bg-secondary: #111827;
    --bg-card: #151C2C;
    --text: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #94A3B8;
    --blue: #6B8AFF;
    --blue-hover: #5A79EE;
    --blue-subtle: rgba(107, 138, 255, 0.12);
    --purple: #9B7DFF;
    --glass-bg: rgba(17, 24, 39, 0.75);
    --glass-bg-light: rgba(17, 24, 39, 0.9);
    --glass-border: rgba(148, 163, 184, 0.12);
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --gradient-primary: linear-gradient(135deg, #6E96FF 0%, #4D7DFF 100%);
  }
  body { background: var(--bg); color: var(--text); }
  .glass-card { background: var(--glass-bg); border-color: var(--glass-border); }
  footer { background: var(--bg-secondary); }
  .section-label { color: var(--blue); }
  .cta-section { background: var(--bg-secondary); }
  .faq-item { border-color: var(--glass-border); }
  .support-card { background: var(--glass-bg); }
  .flow-card { background: var(--glass-bg); }

  /* ===== NAVBAR: white/light glass in dark mode ===== */
  header {
    background: rgba(255, 255, 255, 0.88) !important;
    backdrop-filter: blur(24px) !important;
    -webkit-backdrop-filter: blur(24px) !important;
    border-bottom: 1px solid rgba(255, 255, 255, 0.18) !important;
  }
  .wordmark-hexa { color: #4D7DFF !important; }
  .wordmark-studio { color: #0F1B3D !important; }
  .nav a { color: #334155 !important; }
  .nav a:hover { color: #0F1B3D !important; }
  .nav a.active { color: #4D7DFF !important; }

  /* ===== HERO & FOOTER: logo "Social Platform" text → white ===== */
  .hero .wordmark-studio,
  .footer .wordmark-studio {
    color: #fff !important;
  }

  /* ===== SUPPORT CARD ICONS: white in dark mode ===== */
  .support-card-icon {
    color: #fff !important;
  }

  /* ===== FOOTER SOCIAL ICONS: white in dark mode ===== */
  .footer-col-brand .footer-social a {
    color: #fff !important;
  }

  /* ===== SOCIAL ICON CARDS: liquid glass ===== */
  .section .glass-card[style*="border-radius:100px"],
  .platform-badge {
    background: rgba(255, 255, 255, 0.08) !important;
    backdrop-filter: blur(16px) saturate(1.4) !important;
    -webkit-backdrop-filter: blur(16px) saturate(1.4) !important;
    border: 1px solid rgba(255, 255, 255, 0.15) !important;
    box-shadow:
      0 4px 24px rgba(0, 0, 0, 0.2),
      inset 0 1px 0 rgba(255, 255, 255, 0.1),
      inset 0 -1px 0 rgba(255, 255, 255, 0.05) !important;
    color: var(--text) !important;
  }
  .section .glass-card[style*="border-radius:100px"]:hover,
  .platform-badge:hover {
    background: rgba(255, 255, 255, 0.14) !important;
    border-color: rgba(255, 255, 255, 0.22) !important;
    transform: translateY(-2px);
  }
  /* Icon colors: vivid originals on dark */
  .fa-instagram { color: #E1306C !important; }
  .fa-facebook { color: #1877F2 !important; }
  .fa-linkedin { color: #0A66C2 !important; }
  .fa-tiktok { color: #F1F1F1 !important; }
  .fa-x-twitter { color: #F1F1F1 !important; }
  .fa-youtube { color: #FF0000 !important; }

  /* ===== PLATFORM BADGE ICONS: remove white background ===== */
  .platform-icon {
    background: transparent !important;
  }

  /* ===== COMMUNITY COUNTER CARDS: liquid glass ===== */
  .counter {
    color: #4D7DFF !important;
  }
  .counter ~ div {
    color: var(--text) !important;
  }
  section:has(.counter) .glass-card {
    background: rgba(255, 255, 255, 0.08) !important;
    backdrop-filter: blur(16px) saturate(1.4) !important;
    -webkit-backdrop-filter: blur(16px) saturate(1.4) !important;
    border: 1px solid rgba(255, 255, 255, 0.15) !important;
    box-shadow:
      0 4px 24px rgba(0, 0, 0, 0.2),
      inset 0 1px 0 rgba(255, 255, 255, 0.1),
      inset 0 -1px 0 rgba(255, 255, 255, 0.05) !important;
  }

  /* ===== FAQ: liquid glass + blue answer text ===== */
  .faq-item {
    background: rgba(255, 255, 255, 0.08) !important;
    backdrop-filter: blur(16px) saturate(1.4) !important;
    -webkit-backdrop-filter: blur(16px) saturate(1.4) !important;
    border: 1px solid rgba(255, 255, 255, 0.15) !important;
    box-shadow:
      0 4px 24px rgba(0, 0, 0, 0.2),
      inset 0 1px 0 rgba(255, 255, 255, 0.1),
      inset 0 -1px 0 rgba(255, 255, 255, 0.05) !important;
  }
  .faq-item:hover {
    background: rgba(255, 255, 255, 0.14) !important;
    border-color: rgba(255, 255, 255, 0.22) !important;
  }
  .faq-panel p {
    color: #F1F5F9 !important;
  }
  .faq-question {
    color: var(--text) !important;
  }

  /* ===== WALKTHROUGH VISUAL: dark background ===== */
  .walkthrough-visual {
    background: var(--bg-secondary) !important;
  }

  /* ===== AI CHAT BOXES: better contrast in dark mode ===== */
  .ai-input-box {
    background: rgba(255, 255, 255, 0.06) !important;
    border-color: rgba(148, 163, 184, 0.18) !important;
    color: var(--text-secondary) !important;
  }
  .ai-output-box {
    background: rgba(107, 138, 255, 0.10) !important;
    border-color: rgba(107, 138, 255, 0.25) !important;
    color: var(--text) !important;
  }

  /* ===== HERO BUTTONS: CTA electric blue, outline liquid glass ===== */
  .btn-primary {
    background: var(--gradient-primary) !important;
    color: #fff !important;
    border: none !important;
    box-shadow: 0 4px 20px rgba(77, 125, 255, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.2) !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
  }
  .btn-primary:hover {
    filter: brightness(1.1) !important;
    box-shadow: 0 6px 28px rgba(77, 125, 255, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.25) !important;
  }
  .btn-outline {
    background: rgba(255, 255, 255, 0.06) !important;
    backdrop-filter: blur(12px) !important;
    -webkit-backdrop-filter: blur(12px) !important;
    border: 1px solid rgba(255, 255, 255, 0.18) !important;
    color: var(--text) !important;
  }
  .btn-outline:hover {
    background: rgba(255, 255, 255, 0.14) !important;
    border-color: rgba(255, 255, 255, 0.3) !important;
    color: #fff !important;
  }
}

/* Hamburger geometry moved to main.css (single source of truth for the 44x44 button) */