/* ============================================
   base.css — Heliboarding Design Tokens
   ============================================ */

/* Fonts: Playfair Display (serif display) + DM Sans (sans-serif body) */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,500;0,600;0,700;0,800;1,400;1,500;1,600;1,700&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,300;1,9..40,400&display=swap');

:root {
  /* Typography */
  --font-display: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Type scale */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;
  --text-5xl: 3.5rem;
  --text-6xl: 4.5rem;

  /* Spacing (4px base) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 28px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;

  /* Layout */
  --max-width: 1200px;
  --max-width-wide: 1400px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  /* Accent */
  --accent: #4f98a3;
  --accent-light: #6bb3be;
  --accent-dim: #3a7a84;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 150ms var(--ease-out);
  --transition-base: 250ms var(--ease-out);
  --transition-slow: 400ms var(--ease-out);
}

/* Dark theme (default) */
[data-theme="dark"] {
  --bg-primary: #0f0f0f;
  --bg-secondary: #161616;
  --bg-surface: #1c1b19;
  --bg-surface-hover: #252420;
  --bg-elevated: #222120;
  --bg-stats: #111110;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-hover: rgba(255, 255, 255, 0.16);
  --border-accent: var(--accent);

  --text-primary: #f0ede8;
  --text-secondary: #a09b93;
  --text-tertiary: #6b6660;
  --text-inverse: #0f0f0f;

  --icon-bg: #2a2926;
  --icon-color: var(--accent);

  --overlay-bg: rgba(0, 0, 0, 0.7);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.7);

  color-scheme: dark;
}

/* Light theme */
[data-theme="light"] {
  --bg-primary: #faf9f7;
  --bg-secondary: #f2f0ec;
  --bg-surface: #ffffff;
  --bg-surface-hover: #f5f3ef;
  --bg-elevated: #ffffff;
  --bg-stats: #1a1a1a;
  --border-color: rgba(0, 0, 0, 0.08);
  --border-color-hover: rgba(0, 0, 0, 0.16);
  --border-accent: var(--accent);

  --text-primary: #1a1a1a;
  --text-secondary: #5a5650;
  --text-tertiary: #8a8580;
  --text-inverse: #f0ede8;

  --icon-bg: #e8f4f6;
  --icon-color: var(--accent);

  --overlay-bg: rgba(0, 0, 0, 0.5);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);

  color-scheme: light;
}

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

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

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

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

h1, h2, h3, h4, h5, h6 {
  line-height: 1.15;
  font-weight: 400;
}

ul, ol {
  list-style: none;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 10000;
  padding: var(--space-2) var(--space-4);
  background: var(--accent);
  color: #fff;
  font-size: var(--text-sm);
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  top: var(--space-4);
}

/* Selection */
::selection {
  background: var(--accent);
  color: #fff;
}