/* ============================================
   AIS — Artificial Intelligence Services
   Design Tokens & CSS Variables
   ============================================ */

:root {
  /* Primary Colors */
  --deep-navy: #071827;
  --deep-navy-mid: #0A2540;
  --deep-navy-light: #0D324D;
  --signal-cyan: #10a8be;
  --electric-teal: #10a8be;
  --trust-blue: #10a8be;

  /* Text Colors */
  --ink-black: #071827;
  --slate-gray: #63656e;
  --cool-gray: #63656e;

  /* Background Colors */
  --cloud-white: #F7FAFC;
  --white: #FFFFFF;

  /* Border Colors */
  --soft-slate: #D7DEE8;
  --mist-gray: #E8EEF5;

  /* System Colors */
  --success-green: #10B981;
  --warning-amber: #F59E0B;
  --error-red: #EF4444;

  /* Transparent Variants */
  --white-70: rgba(255, 255, 255, 0.7);
  --white-60: rgba(255, 255, 255, 0.6);
  --white-40: rgba(255, 255, 255, 0.4);
  --white-30: rgba(255, 255, 255, 0.3);
  --white-10: rgba(255, 255, 255, 0.1);
  --signal-cyan-10: rgba(16, 168, 190, 0.1);
  --signal-cyan-15: rgba(16, 168, 190, 0.15);
  --signal-cyan-30: rgba(16, 168, 190, 0.3);
  --trust-blue-10: rgba(16, 168, 190, 0.1);
  --electric-teal-10: rgba(16, 168, 190, 0.1);
  --success-green-10: rgba(16, 185, 129, 0.1);
  --warning-amber-10: rgba(245, 158, 11, 0.1);
  --error-red-10: rgba(239, 68, 68, 0.1);

  /* Gradients */
  --hero-gradient: radial-gradient(ellipse 80% 60% at 50% 40%, #0A2540 0%, #071827 100%);
  --cta-gradient: linear-gradient(135deg, #071827 0%, #0D324D 50%, #071827 100%);
  --accent-glow: radial-gradient(circle, rgba(16, 168, 190, 0.15) 0%, transparent 70%);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  --shadow-card-hover: 0 8px 32px rgba(16, 168, 190, 0.12), 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-teal-glow: 0 0 20px rgba(16, 168, 190, 0.2), 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-navbar: 0 2px 16px rgba(0, 0, 0, 0.08);

  /* Typography Scale */
  --font-display: clamp(40px, 5vw, 64px);
  --font-h1: clamp(36px, 4vw, 48px);
  --font-h2: clamp(28px, 3vw, 36px);
  --font-h3: clamp(20px, 2vw, 24px);
  --font-h4: clamp(16px, 1.5vw, 18px);
  --font-body: 16px;
  --font-body-sm: 14px;
  --font-label: 12px;

  /* Font Weights */
  --font-regular: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* Line Heights */
  --lh-display: 1.1;
  --lh-h1: 1.15;
  --lh-h2: 1.25;
  --lh-h3: 1.3;
  --lh-h4: 1.4;
  --lh-body: 1.65;
  --lh-label: 1.4;

  /* Letter Spacing */
  --ls-display: -0.02em;
  --ls-h1: -0.02em;
  --ls-h2: -0.01em;
  --ls-h3: -0.01em;
  --ls-label: 0.05em;
  --ls-nav: 0.01em;

  /* Spacing Scale */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 80px;
  --space-5xl: 120px;

  /* Container */
  --container-max: 1200px;
  --container-pad: 24px;
  --container-pad-mobile: 16px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 9999px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;
  --transition-slower: 0.4s ease;

  /* Z-Index Scale */
  --z-dropdown: 100;
  --z-navbar: 1000;
  --z-modal: 2000;
  --z-loader: 3000;

  /* Section Padding */
  --section-pad-desktop: 120px;
  --section-pad-tablet: 80px;
  --section-pad-mobile: 60px;
}

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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: var(--font-body);
  line-height: var(--lh-body);
  color: var(--slate-gray);
  background: var(--white);
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
}

img {
  max-width: 100%;
  display: block;
}

input, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* Utility Classes */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--container-pad-mobile);
  }
}