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

:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --success: #10b981;
    --danger: #ef4444;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-500: #6b7280;
    --gray-700: #374151;
    --gray-900: #111827;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--gray-50);
    color: var(--gray-900);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.header {
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--gray-700);
    text-decoration: none;
    transition: color 0.2s;
}

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

.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.5rem;
    opacity: 0.95;
    margin-bottom: 2rem;
}

.search-box {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    gap: 1rem;
}

.search-box input {
    flex: 1;
    padding: 1rem;
    font-size: 1rem;
    border: none;
    border-radius: 0.5rem;
}

.search-box button {
    padding: 1rem 2rem;
    background: var(--primary-dark);
    color: white;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 600;
}

.stats-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: -2rem 0 3rem 0;
    padding: 1.5rem;
    background: white;
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.stat-item {
    text-align: center;
    padding: 1rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-top: 0.25rem;
}

.cities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.city-card {
    background: white;
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    transition: all 0.2s;
}

.city-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.city-card h3 {
    margin-bottom: 0.5rem;
}

.city-card a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

.price {
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0.5rem 0;
}

.evolution {
    font-size: 0.875rem;
}

.positive { color: var(--success); }
.negative { color: var(--danger); }

.volume {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-top: 0.5rem;
}

.footer {
    background: var(--gray-900);
    color: white;
    padding: 3rem 0;
    margin-top: 4rem;
    text-align: center;
}

.footer p {
    margin: 0.5rem 0;
    color: var(--gray-400);
}

h2 {
    font-size: 2rem;
    margin: 3rem 0 1.5rem 0;
    text-align: center;
}

.section {
    margin: 3rem 0;
}

.content-block {
    background: white;
    padding: 2rem;
    border-radius: 0.5rem;
    margin: 1rem 0;
}

@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .stats-bar { grid-template-columns: 1fr; }
    .search-box { flex-direction: column; }
}