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

:root {
    --bg: #ffffff;
    --text: #222;
    --card-bg: #f9f9f9;
    --primary: #2c3e50;
    --accent: #e74c3c;
    --border: #ddd;
    --shadow: 0 4px 12px rgba(0,0,0,0.1);
    --radius: 16px;
}

[data-theme="dark"] {
    --bg: #1a1a2e;
    --text: #e0e0e0;
    --card-bg: #16213e;
    --primary: #0f3460;
    --accent: #e94560;
    --border: #333;
    --shadow: 0 4px 12px rgba(0,0,0,0.5);
}

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background 0.3s, color 0.3s;
}

.header {
    background: var(--primary);
    color: #fff;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo a {
    color: #fff;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: 700;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s;
}

.nav-links a:hover {
    opacity: 0.8;
}

.header-controls {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.btn-icon {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.3);
    color: #fff;
    padding: 0.4rem 0.8rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.3s;
}

.btn-icon:hover {
    background: rgba(255,255,255,0.1);
}

.hamburger {
    display: none;
    background: transparent;
    border: none;
    color: #fff;
    font-size: 1.8rem;
    cursor: pointer;
}

.hero {
    text-align: center;
    padding: 3rem 1rem;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
}

.hero h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.search-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    justify-content: center;
    max-width: 900px;
    margin: 2rem auto;
}

.search-bar input, .search-bar select, .search-bar button {
    padding: 0.7rem 1rem;
    border-radius: 12px;
    border: none;
    font-size: 0.95rem;
    background: #fff;
    color: #333;
    flex: 1 1 150px;
    box-shadow: var(--shadow);
}

.search-bar button {
    background: var(--accent);
    color: #fff;
    cursor: pointer;
    flex: 0 0 auto;
    transition: transform 0.2s;
}

.search-bar button:hover {
    transform: scale(1.05);
}

.property-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.property-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    display: flex;
    flex-direction: column;
}

.property-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.2);
}

.property-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.card-body {
    padding: 1rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.card-body h3 {
    font-size: 1.2rem;
    margin-bottom: 0.3rem;
}

.price {
    font-size: 1.3rem;
    color: var(--accent);
    font-weight: 700;
}

.location, .category {
    font-size: 0.9rem;
    color: var(--text);
    opacity: 0.7;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin: 0.5rem 0;
}

.tag {
    background: var(--primary);
    color: #fff;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-size: 0.75rem;
}

.btn {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    padding: 0.5rem 1rem;
    border-radius: 12px;
    text-decoration: none;
    text-align: center;
    margin-top: auto;
    transition: background 0.3s;
}

.btn:hover {
    background: #c0392b;
}

.stats-section {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 1rem 0;
}

.stat-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
}

.stat-card h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.stat-card p {
    font-size: 1.5rem;
    font-weight: 700;
}

.heatmap {
    margin-top: 2rem;
}

#heatmapContainer {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1rem;
    min-height: 150px;
    box-shadow: var(--shadow);
}

footer {
    text-align: center;
    padding: 1.5rem;
    background: var(--primary);
    color: #fff;
    margin-top: 2rem;
}

footer a {
    color: #fff;
    text-decoration: underline;
}

.login-container {
    max-width: 400px;
    margin: 5rem auto;
    padding: 2rem;
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
}

.login-container input {
    width: 100%;
    padding: 0.7rem;
    margin: 0.5rem 0;
    border: 1px solid var(--border);
    border-radius: 8px;
}

.login-container button {
    width: 100%;
    padding: 0.7rem;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

.admin-main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.admin-section {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.admin-form input, .admin-form textarea, .admin-form select {
    width: 100%;
    padding: 0.6rem;
    margin: 0.3rem 0;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
}

.admin-form button {
    padding: 0.6rem 1.5rem;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    margin-top: 0.5rem;
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
}

.admin-table th, .admin-table td {
    border: 1px solid var(--border);
    padding: 0.6rem;
    text-align: left;
}

.admin-table th {
    background: var(--primary);
    color: #fff;
}

.success {
    color: green;
    font-weight: 500;
}

.error {
    color: red;
    font-weight: 500;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        background: var(--primary);
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        padding: 1rem;
    }
    .nav-links.active {
        display: flex;
    }
    .hamburger {
        display: block;
    }
    .search-bar {
        flex-direction: column;
        align-items: stretch;
    }
    .search-bar input, .search-bar select, .search-bar button {
        flex: 1 1 auto;
    }
    .property-grid {
        grid-template-columns: 1fr;
        padding: 1rem;
    }
}