/**
 * T20 CCL Base Design System & CSS Tokens
 * Version: 1.0.0
 */

:root {
  /* Brand Color Palette */
  --ccl-navy-900: #071A2B;
  --ccl-navy-800: #0D233A;
  --ccl-navy-700: #133252;
  --ccl-navy-600: #1B456F;
  --ccl-green-700: #0A7A53;
  --ccl-green-600: #0E9F6E;
  --ccl-green-500: #10B981;
  --ccl-green-400: #34D399;
  --ccl-green-50: #ECFDF5;
  --ccl-gold-600: #D97706;
  --ccl-gold-500: #F59E0B;
  --ccl-gold-400: #FBBF24;
  --ccl-gold-50: #FFFBEB;
  --ccl-red-500: #EF4444;

  /* Neutral Surface & Text Palette */
  --ccl-white: #FFFFFF;
  --ccl-bg-light: #F8FAFC;
  --ccl-bg-card: #FFFFFF;
  --ccl-text-primary: #0F172A;
  --ccl-text-secondary: #334155;
  --ccl-text-muted: #64748B;
  --ccl-border-light: #E2E8F0;
  --ccl-border-card: #CBD5E1;

  /* Typography */
  --ccl-font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  --ccl-font-display: "Montserrat", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

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

  /* Shadows */
  --ccl-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --ccl-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --ccl-shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --ccl-shadow-card: 0 4px 20px rgba(7, 26, 43, 0.06);
  --ccl-shadow-glow: 0 0 20px rgba(16, 185, 129, 0.25);

  /* Radii */
  --ccl-radius-sm: 4px;
  --ccl-radius-md: 8px;
  --ccl-radius-lg: 12px;
  --ccl-radius-xl: 16px;
  --ccl-radius-full: 9999px;

  /* Transition */
  --ccl-transition-fast: 150ms ease;
  --ccl-transition-normal: 250ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--ccl-font-sans);
  background-color: var(--ccl-bg-light);
  color: var(--ccl-text-secondary);
  line-height: 1.6;
  font-weight: 400;
  overflow-x: hidden;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  color: var(--ccl-text-primary);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: var(--ccl-space-md);
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 4vw + 1rem, 3.25rem); font-weight: 800; }
h2 { font-size: clamp(1.6rem, 2.5vw + 0.8rem, 2.35rem); font-weight: 700; }
h3 { font-size: clamp(1.25rem, 1.5vw + 0.6rem, 1.65rem); }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--ccl-space-md);
}

a {
  color: var(--ccl-green-600);
  text-decoration: none;
  transition: color var(--ccl-transition-fast);
}

a:hover {
  color: var(--ccl-green-700);
}

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

ul, ol {
  margin-bottom: var(--ccl-space-md);
  padding-left: var(--ccl-space-xl);
}

li {
  margin-bottom: var(--ccl-space-xs);
}

/* Layout Utilities */
.t20-container {
  width: 100%;
  max-width: 1220px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.t20-container-narrow {
  width: 100%;
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.t20-section {
  padding: 60px 0;
}

.t20-section-dark {
  background-color: var(--ccl-navy-900);
  color: #E2E8F0;
}

.t20-section-dark h1,
.t20-section-dark h2,
.t20-section-dark h3,
.t20-section-dark h4 {
  color: var(--ccl-white);
}

.t20-section-dark p {
  color: #CBD5E1;
}

.t20-section-light {
  background-color: #FFFFFF;
}

.t20-section-gray {
  background-color: var(--ccl-bg-light);
}

/* Section Header Styles */
.t20-section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 48px;
}

.t20-section-tag {
  display: inline-block;
  font-size: 0.825rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 12px;
  border-radius: var(--ccl-radius-full);
  margin-bottom: 12px;
  background-color: rgba(16, 185, 129, 0.12);
  color: var(--ccl-green-600);
}

.t20-section-dark .t20-section-tag {
  background-color: rgba(16, 185, 129, 0.2);
  color: var(--ccl-green-400);
}

.t20-section-subtitle {
  font-size: 1.125rem;
  color: var(--ccl-text-muted);
  line-height: 1.6;
}

.t20-section-dark .t20-section-subtitle {
  color: #94A3B8;
}

/* Button System */
.t20-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--ccl-radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--ccl-transition-fast);
  text-align: center;
  line-height: 1.25;
  white-space: nowrap;
}

.t20-btn-primary {
  background-color: var(--ccl-green-500);
  color: var(--ccl-navy-900);
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
}

.t20-btn-primary:hover {
  background-color: var(--ccl-green-400);
  color: var(--ccl-navy-900);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.45);
}

.t20-btn-gold {
  background-color: var(--ccl-gold-500);
  color: var(--ccl-navy-900);
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.3);
}

.t20-btn-gold:hover {
  background-color: var(--ccl-gold-400);
  color: var(--ccl-navy-900);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.4);
}

.t20-btn-outline-white {
  background-color: transparent;
  border-color: rgba(255, 255, 255, 0.35);
  color: var(--ccl-white);
}

.t20-btn-outline-white:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: var(--ccl-white);
  color: var(--ccl-white);
  transform: translateY(-2px);
}

.t20-btn-lg {
  padding: 16px 34px;
  font-size: 1.125rem;
}

.t20-btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

/* Accessible focus outline */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 3px solid var(--ccl-green-500);
  outline-offset: 2px;
}