/* ===== CSS Variables & Base ===== */
:root {
  /* Colors - Light */
  --color-bg: #f8f9fa;
  --color-surface: #ffffff;
  --color-surface-hover: #f1f3f5;
  --color-text: #1a1a2e;
  --color-text-secondary: #6c757d;
  --color-text-muted: #adb5bd;
  --color-border: #e9ecef;
  --color-accent: #e63946;
  --color-accent-hover: #d62839;
  --color-shadow: rgba(0, 0, 0, 0.06);
  --color-shadow-lg: rgba(0, 0, 0, 0.1);
  --color-overlay: rgba(0, 0, 0, 0.5);

  /* Dynamic background (set via JS data attributes) */
  --bg-gradient: linear-gradient(160deg, #a8dadc 0%, #f1faee 100%);

  /* Typography */
  --font-primary: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.85rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.15rem;
  --font-size-xl: 1.5rem;
  --font-size-hero-temp: clamp(4rem, 12vw, 8rem);
  --font-size-phrase: clamp(1.1rem, 3vw, 1.5rem);

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

  /* Layout */
  --max-width: 900px;
  --header-height: 64px;
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --border-radius-pill: 100px;
}

/* Dark Theme */
[data-theme="dark"] {
  --color-bg: #0f1117;
  --color-surface: #1a1d27;
  --color-surface-hover: #252836;
  --color-text: #e8e8ed;
  --color-text-secondary: #9ca3af;
  --color-text-muted: #6b7280;
  --color-border: #2a2d3a;
  --color-shadow: rgba(0, 0, 0, 0.2);
  --color-shadow-lg: rgba(0, 0, 0, 0.3);
  --color-overlay: rgba(0, 0, 0, 0.7);
}

/* ===== Dynamic Background Gradients ===== */
/* Clear Day */
body[data-conditions="clear"][data-daytime="day"] {
  --bg-gradient: linear-gradient(160deg, #87ceeb 0%, #e0f0ff 50%, #f8f9fa 100%);
}
[data-theme="dark"] body[data-conditions="clear"][data-daytime="day"],
body[data-conditions="clear"][data-daytime="night"] {
  --bg-gradient: linear-gradient(160deg, #0c1445 0%, #1a1d3a 50%, #0f1117 100%);
}
[data-theme="dark"] body[data-conditions="clear"][data-daytime="night"] {
  --bg-gradient: linear-gradient(160deg, #0c1445 0%, #1a1d3a 50%, #0f1117 100%);
}

/* Cloudy */
body[data-conditions="cloudy"],
body[data-conditions="partly-cloudy"] {
  --bg-gradient: linear-gradient(160deg, #c8d6e5 0%, #dfe6e9 50%, #f8f9fa 100%);
}
[data-theme="dark"] body[data-conditions="cloudy"],
[data-theme="dark"] body[data-conditions="partly-cloudy"] {
  --bg-gradient: linear-gradient(160deg, #1a1d27 0%, #252836 50%, #0f1117 100%);
}

/* Rain */
body[data-conditions="rain"],
body[data-conditions="heavy-rain"],
body[data-conditions="drizzle"] {
  --bg-gradient: linear-gradient(160deg, #636e72 0%, #b2bec3 50%, #dfe6e9 100%);
}
[data-theme="dark"] body[data-conditions="rain"],
[data-theme="dark"] body[data-conditions="heavy-rain"],
[data-theme="dark"] body[data-conditions="drizzle"] {
  --bg-gradient: linear-gradient(160deg, #0a0e14 0%, #1a1d27 50%, #0f1117 100%);
}

/* Snow */
body[data-conditions="snow"],
body[data-conditions="heavy-snow"] {
  --bg-gradient: linear-gradient(160deg, #dce6f1 0%, #ecf0f5 50%, #f8f9fa 100%);
}
[data-theme="dark"] body[data-conditions="snow"],
[data-theme="dark"] body[data-conditions="heavy-snow"] {
  --bg-gradient: linear-gradient(160deg, #1a2030 0%, #252d3f 50%, #0f1117 100%);
}

/* Thunderstorm */
body[data-conditions="thunderstorm"] {
  --bg-gradient: linear-gradient(160deg, #2d3436 0%, #636e72 50%, #b2bec3 100%);
}
[data-theme="dark"] body[data-conditions="thunderstorm"] {
  --bg-gradient: linear-gradient(160deg, #05080d 0%, #111520 50%, #0f1117 100%);
}

/* Fog */
body[data-conditions="fog"] {
  --bg-gradient: linear-gradient(160deg, #d5dbe0 0%, #e8ecef 50%, #f8f9fa 100%);
}
[data-theme="dark"] body[data-conditions="fog"] {
  --bg-gradient: linear-gradient(160deg, #15181f 0%, #1e2230 50%, #0f1117 100%);
}

/* Freezing Rain */
body[data-conditions="freezing-rain"] {
  --bg-gradient: linear-gradient(160deg, #a4b6c4 0%, #c5d3de 50%, #e8edf2 100%);
}
[data-theme="dark"] body[data-conditions="freezing-rain"] {
  --bg-gradient: linear-gradient(160deg, #10141d 0%, #1a2030 50%, #0f1117 100%);
}

/* Hot tint */
body[data-temp-range="hot"],
body[data-temp-range="extreme-hot"] {
  --color-accent: #e63946;
}

/* Cold tint */
body[data-temp-range="extreme-cold"],
body[data-temp-range="cold"] {
  --color-accent: #457b9d;
}

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

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

body {
  font-family: var(--font-primary);
  color: var(--color-text);
  background: var(--bg-gradient);
  min-height: 100vh;
  line-height: 1.5;
  transition: background 1.5s ease, color 0.3s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--color-accent-hover);
}

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

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

input {
  font-family: inherit;
  border: none;
  outline: none;
}

/* ===== Layout ===== */
.main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--header-height) + var(--space-lg)) var(--space-md) var(--space-2xl);
}

/* ===== Section Titles ===== */
.section-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-md);
  letter-spacing: -0.01em;
}

/* ===== Utility ===== */
[hidden] {
  display: none !important;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}