/* public/style.css
   ─────────────────────────────────────────────────────────────
   CSS custom properties (variables) at the top make it easy
   to retheme the whole app by changing just a few values.
   This is also where Part 2's dynamic backgrounds will hook in —
   we'll swap --bg-gradient based on weather conditions.
   ───────────────────────────────────────────────────────────── */

/* ── CSS Variables (Design Tokens) ──────────────────────────── */
:root {
  /* Background — Part 2 will swap this dynamically */
  --bg-gradient: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);

  /* Cards */
  --card-bg: rgba(255, 255, 255, 0.08);
  --card-border: rgba(255, 255, 255, 0.12);
  --card-radius: 16px;

  /* Typography */
  --font: "Inter", sans-serif;
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.65);
  --text-muted: rgba(255, 255, 255, 0.4);

  /* Accent — WECS pink */
  --accent: #e91e8c;
  --accent-light: rgba(233, 30, 140, 0.15);

  /* Spacing scale */
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;

  /* Transitions */
  --transition: 0.25s ease;
}

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

body {
  font-family: var(--font);
  background: var(--bg-gradient);
  /* min-height ensures the gradient covers the full viewport
     even when there's not much content */
  min-height: 100vh;
  color: var(--text-primary);
  /* Part 2 hook: background-attachment fixed makes gradient
     stay in place when dynamic backgrounds are added */
  background-attachment: fixed;
}

/* ── Layout ──────────────────────────────────────────────────── */
.app-container {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* ── Header ──────────────────────────────────────────────────── */
.app-header {
  text-align: center;
}

.app-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.app-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ── Search ──────────────────────────────────────────────────── */
.search-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.search-bar {
  display: flex;
  gap: var(--space-sm);
}

.search-input {
  flex: 1;
  padding: 14px var(--space-md);
  border-radius: 12px;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 1rem;
  outline: none;
  transition: border-color var(--transition);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-input:focus {
  border-color: var(--accent);
}

.search-btn {
  padding: 14px var(--space-lg);
  border-radius: 12px;
  border: none;
  background: var(--accent);
  color: #fff;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition);
}

.search-btn:hover {
  opacity: 0.88;
  transform: translateY(-1px);
}

.search-btn:active {
  transform: translateY(0);
}

/* ── Error message ───────────────────────────────────────────── */
.error-msg {
  color: #ff6b6b;
  font-size: 0.9rem;
  padding: var(--space-sm) var(--space-md);
  background: rgba(255, 107, 107, 0.1);
  border-radius: 8px;
  border: 1px solid rgba(255, 107, 107, 0.3);
}

/* ── Loading spinner ─────────────────────────────────────────── */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  color: var(--text-secondary);
  padding: var(--space-xl) 0;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--card-border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── Utility: hidden ─────────────────────────────────────────── */
/* We toggle this class from JavaScript to show/hide sections */
.hidden {
  display: none !important;
}

/* ── Cards ───────────────────────────────────────────────────── */
.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  padding: var(--space-lg);
  /* Glassmorphism effect — subtle blur on card background */
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.card-title {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

/* ── Current weather card ────────────────────────────────────── */
.current-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-md);
}

.city-name {
  font-size: 1.6rem;
  font-weight: 700;
}

.city-country {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.weather-icon {
  width: 72px;
  height: 72px;
}

.current-main {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.current-temp {
  font-size: 3.5rem;
  font-weight: 300;
  letter-spacing: -2px;
  line-height: 1;
}

.current-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  text-transform: capitalize;
}

/* ── Detail grid ─────────────────────────────────────────────── */
.detail-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
}

.detail-item {
  background: var(--accent-light);
  border-radius: 10px;
  padding: var(--space-sm) var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.detail-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.detail-value {
  font-size: 0.95rem;
  font-weight: 500;
}

/* ── AQI card ────────────────────────────────────────────────── */
.aqi-display {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.aqi-label {
  font-size: 1.2rem;
  font-weight: 700;
  padding: 6px 16px;
  border-radius: 20px;
  /* color set dynamically by JS using the hex from our API */
  background: rgba(255,255,255,0.1);
  white-space: nowrap;
}

.aqi-advice {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ── Forecast strip ──────────────────────────────────────────── */
.forecast-strip {
  display: grid;
  /* auto-fit: creates as many columns as fit, minimum 80px each */
  grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
  gap: var(--space-sm);
}

.forecast-day {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: var(--space-sm);
  border-radius: 10px;
  background: var(--accent-light);
  text-align: center;
}

.forecast-day-name {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.forecast-icon {
  width: 40px;
  height: 40px;
}

.forecast-high {
  font-size: 0.95rem;
  font-weight: 600;
}

.forecast-low {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ── Footer ──────────────────────────────────────────────────── */
.app-footer {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.app-footer a {
  color: var(--accent);
  text-decoration: none;
}

.app-footer a:hover {
  text-decoration: underline;
}

/* ── Responsive — phones ─────────────────────────────────────── */
@media (max-width: 480px) {
  .current-temp {
    font-size: 2.8rem;
  }

  .detail-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .search-btn {
    padding: 14px var(--space-md);
  }
}