:root {
  --primary-color: #0ea5e9; /* Light blue / electric blue */
  --primary-hover: #0284c7;
  --bg-color: #0f172a; /* Deep dark blue for premium dark mode */
  --surface-color: #1e293b;
  --surface-color-hover: #334155;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: #334155;
  --accent-green: #10b981; /* For fast chargers / available */
  --accent-orange: #f59e0b; /* For paid / busy */
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  --transition-speed: 0.3s;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-speed);
}

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

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  border-bottom: 1px solid var(--border-color);
  padding: 20px 0;
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo span {
  color: var(--primary-color);
}

main {
  padding: 40px 0;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 60px 0;
  background: linear-gradient(180deg, rgba(14, 165, 233, 0.1) 0%, rgba(15, 23, 42, 0) 100%);
  border-radius: 20px;
  margin-bottom: 40px;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 15px;
  background: -webkit-linear-gradient(45deg, var(--primary-color), #38bdf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 30px;
}

/* Cards */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.card {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  border-color: var(--primary-color);
}

.card h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.card p {
  color: var(--text-muted);
  margin-bottom: 8px;
  font-size: 0.95rem;
}

.card strong {
  color: var(--text-main);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 15px;
}

.tag {
  background: rgba(14, 165, 233, 0.1);
  color: var(--primary-color);
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid rgba(14, 165, 233, 0.2);
}

.tag.fast {
  background: rgba(16, 185, 129, 0.1);
  color: var(--accent-green);
  border-color: rgba(16, 185, 129, 0.2);
}

.btn {
  display: inline-block;
  background: var(--primary-color);
  color: white;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  margin-top: 15px;
  text-align: center;
  width: 100%;
}

.btn:hover {
  background: var(--primary-hover);
  color: white;
}

/* City Grid Globally */
.city-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 15px; }
.city-card { background: rgba(255,255,255,0.02); padding: 20px; border-radius: 12px; border: 1px solid var(--border-color); text-align: center; display: block; transition: all 0.2s; }
.city-card:hover { border-color: var(--primary-color); background: rgba(14, 165, 233, 0.05); transform: translateY(-3px); }
.city-name { font-size: 1.1rem; font-weight: bold; display: block; margin-bottom: 5px; color: var(--text-main); }
.city-count { color: var(--text-muted); font-size: 0.9rem; }

/* Utilities */
@keyframes spin {
  100% { transform: rotate(360deg); }
}
.animate-spin {
  animation: spin 1s linear infinite;
}