/* ==============================================================
   WellDepthData.com — Silicon Valley Hydrogeological Design System
   Vanilla CSS • Score 100 PageSpeed • Mobile-First Responsive
   ============================================================== */

:root {
  --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --font-display: 'Outfit', sans-serif;

  /* Dark Theme (Default) */
  --bg-base: #060913;
  --bg-surface: #0C1222;
  --bg-surface-elevated: #131C35;
  --bg-card: rgba(16, 24, 45, 0.78);
  --bg-card-hover: rgba(23, 34, 62, 0.92);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(2, 132, 199, 0.6);

  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;

  /* Hydrogeology Colors */
  --water-primary: #0284C7;
  --water-light: #38BDF8;
  --water-glow: rgba(2, 132, 199, 0.3);
  --aquifer-cyan: #06B6D4;
  --aquifer-glow: rgba(6, 182, 212, 0.25);

  --success: #10B981;
  --success-bg: rgba(16, 185, 129, 0.12);
  --warning: #F59E0B;
  --warning-bg: rgba(245, 158, 11, 0.12);

  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 6px 18px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.55);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 9999px;
}

[data-theme="light"] {
  --bg-base: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #F1F5F9;
  --bg-card: rgba(255, 255, 255, 0.92);
  --bg-card-hover: #FFFFFF;
  --border-subtle: #E2E8F0;
  --border-focus: #0284C7;

  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;

  --water-primary: #0284C7;
  --water-light: #0369A1;
  --water-glow: rgba(2, 132, 199, 0.15);

  --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 12px 30px rgba(0, 0, 0, 0.1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

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

/* Background Ambient Glows */
.ambient-glow {
  position: fixed;
  top: -20%;
  left: 15%;
  width: 850px;
  height: 850px;
  background: radial-gradient(circle, rgba(2, 132, 199, 0.14) 0%, rgba(6, 182, 212, 0.06) 50%, transparent 70%);
  filter: blur(90px);
  pointer-events: none;
  z-index: 0;
}
.ambient-glow-2 {
  position: fixed;
  bottom: -15%;
  right: 10%;
  width: 750px;
  height: 750px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.08) 0%, rgba(2, 132, 199, 0.04) 50%, transparent 70%);
  filter: blur(90px);
  pointer-events: none;
  z-index: 0;
}

.container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Header & Navigation */
header {
  background: rgba(12, 18, 34, 0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 14px 0;
}
[data-theme="light"] header {
  background: rgba(255, 255, 255, 0.9);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}
.brand-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #0284C7 0%, #06B6D4 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  box-shadow: 0 4px 16px var(--water-glow);
}
.brand-text h1 {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}
.brand-text p {
  font-size: 12px;
  color: var(--text-muted);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
}
.nav-link {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s ease;
}
.nav-link:hover {
  color: var(--water-light);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 700;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-decoration: none;
  border: 1px solid transparent;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}
.btn-primary {
  background: linear-gradient(135deg, #0284C7 0%, #0369A1 100%);
  color: #FFFFFF;
  box-shadow: 0 4px 14px var(--water-glow);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(2, 132, 199, 0.45);
}
.btn-ghost {
  background: var(--bg-surface-elevated);
  color: var(--text-secondary);
  border-color: var(--border-subtle);
}
.btn-ghost:hover {
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.2);
}
.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 16px;
}

/* Hero Section */
.hero-section {
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.12) 0%, rgba(6, 182, 212, 0.08) 50%, rgba(16, 185, 129, 0.08) 100%);
  border: 1px solid rgba(2, 132, 199, 0.3);
  border-radius: var(--radius-xl);
  padding: 44px;
  margin: 32px 0 40px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  background: rgba(2, 132, 199, 0.2);
  border: 1px solid rgba(2, 132, 199, 0.4);
  color: #38BDF8;
  font-size: 11.5px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 14px;
}
.hero-title {
  font-family: var(--font-display);
  font-size: 38px;
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 14px;
}
.hero-title span {
  background: linear-gradient(135deg, #38BDF8 0%, #06B6D4 50%, #34D399 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-desc {
  font-size: 15.5px;
  color: var(--text-secondary);
  max-width: 900px;
  line-height: 1.65;
  margin-bottom: 28px;
}

/* Search Box Hub */
.search-hub {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 12px;
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  max-width: 860px;
}
.search-input-wrapper {
  flex: 1;
  min-width: 240px;
  position: relative;
}
.search-input-wrapper input {
  width: 100%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 16px 12px 42px;
  font-size: 14px;
  color: var(--text-primary);
  outline: none;
}
.search-input-wrapper input:focus {
  border-color: var(--water-primary);
  box-shadow: 0 0 0 3px var(--water-glow);
}
.search-input-wrapper svg {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--text-muted);
}
.state-select {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: 13.5px;
  color: var(--text-primary);
  outline: none;
  cursor: pointer;
  min-width: 180px;
}

/* Stats Row */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin-bottom: 40px;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 22px;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  gap: 4px;
  box-shadow: var(--shadow-sm);
}
.stat-label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}
.stat-value {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 900;
  color: var(--text-primary);
}
.stat-subtext {
  font-size: 12px;
  color: var(--text-secondary);
}

/* Table Card */
.table-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  margin-bottom: 40px;
}
.table-header-strip {
  padding: 20px 24px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.table-wrapper {
  overflow-x: auto;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  text-align: left;
}
thead th {
  background: var(--bg-surface-elevated);
  padding: 16px 18px;
  font-weight: 800;
  color: var(--text-primary);
  text-transform: uppercase;
  font-size: 11.5px;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-subtle);
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
}
thead th:hover {
  color: var(--water-light);
}
tbody tr {
  border-bottom: 1px solid var(--border-subtle);
  transition: background 0.15s ease;
}
tbody tr:hover {
  background: var(--bg-card-hover);
}
tbody td {
  padding: 15px 18px;
  vertical-align: middle;
  color: var(--text-secondary);
}

/* Badges & Tags */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 9px;
  border-radius: var(--radius-pill);
  font-size: 11px;
  font-weight: 800;
}
.badge-water {
  background: rgba(2, 132, 199, 0.15);
  color: #38BDF8;
  border: 1px solid rgba(2, 132, 199, 0.35);
}
.badge-emerald {
  background: rgba(16, 185, 129, 0.15);
  color: #34D399;
  border: 1px solid rgba(16, 185, 129, 0.35);
}
.badge-amber {
  background: rgba(245, 158, 11, 0.15);
  color: #FBBF24;
  border: 1px solid rgba(245, 158, 11, 0.35);
}

/* Interactive Calculator Container */
.calculator-card {
  background: var(--bg-card);
  border: 1px solid rgba(2, 132, 199, 0.35);
  border-radius: var(--radius-xl);
  padding: 36px;
  margin-bottom: 40px;
  backdrop-filter: blur(12px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4), var(--water-glow);
}

.sim-range {
  width: 100%;
  height: 6px;
  border-radius: var(--radius-pill);
  background: var(--border-subtle);
  outline: none;
  -webkit-appearance: none;
  cursor: pointer;
}
.sim-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--water-primary);
  border: 2px solid #FFFFFF;
  box-shadow: 0 0 10px rgba(2, 132, 199, 0.5);
  cursor: pointer;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-subtle);
  padding: 40px 0;
  margin-top: 60px;
  background: var(--bg-surface);
  color: var(--text-muted);
  font-size: 13px;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 30px;
  margin-bottom: 30px;
}
.footer-col h4 {
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 800;
  margin-bottom: 12px;
}
.footer-col a {
  display: block;
  color: var(--text-secondary);
  text-decoration: none;
  margin-bottom: 8px;
  font-size: 13px;
}
.footer-col a:hover {
  color: var(--water-light);
}

@media (max-width: 768px) {
  .hero-section {
    padding: 26px 20px;
  }
  .hero-title {
    font-size: 26px;
  }
  .search-hub {
    flex-direction: column;
    align-items: stretch;
  }
}