/* ===== FONTS ===== */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@400;500;600&display=swap');

/* ===== CSS CUSTOM PROPERTIES ===== */
:root {
  /* Colors - Sunbear palette */
  --color-bg-dark: #000000;
  --color-bg-dark-end: #1a1a1a;
  --color-bg-section: #FFFFFF;
  --color-bg-section-alt: #f7f7f7;
  --color-bg-card: #FFFFFF;
  --color-card-border: #E6E6E6;

  /* Accent colors - Sunbear brand */
  --color-accent-1: #00AAE6;      /* blue - primary links & publications */
  --color-accent-1-light: rgba(0, 170, 230, 0.08);
  --color-accent-2: #FFAA00;      /* amber - working papers & buttons */
  --color-accent-2-light: rgba(255, 170, 0, 0.08);
  --color-accent-3: #FF0007;      /* red - work in progress accent */
  --color-accent-3-light: rgba(255, 0, 7, 0.08);

  /* Text */
  --color-text-primary: #333333;
  --color-text-secondary: #666666;
  --color-text-light: #E6E6E6;
  --color-text-on-dark: #FFFFFF;

  /* Nav */
  --color-nav-bg: rgba(255, 255, 255, 0.92);
  --color-nav-border: #E6E6E6;

  /* Typography */
  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Font sizes */
  --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: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-hero: 4.5rem;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-section: 5rem;

  /* Layout */
  --max-width: 1000px;
  --border-radius: 8px;
  --border-radius-sm: 6px;
  --border-radius-pill: 50px;

  /* Shadows - subtle */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.08);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ===== DARK MODE ===== */
[data-theme="dark"] {
  --color-bg-section: #111111;
  --color-bg-section-alt: #1a1a1a;
  --color-bg-card: #1e1e1e;
  --color-card-border: rgba(255, 255, 255, 0.1);
  --color-text-primary: #E6E6E6;
  --color-text-secondary: #999999;
  --color-nav-bg: rgba(17, 17, 17, 0.95);
  --color-nav-border: rgba(255, 255, 255, 0.08);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.4);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--color-text-primary);
  background-color: var(--color-bg-section);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.2;
  font-weight: 700;
}

a {
  color: var(--color-accent-1);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: #0088bb;
}

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

ul {
  list-style: none;
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  [data-aos] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}