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

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --bg: #ffffff;
    --bg-alt: #f5f5f7;
    --text: #1a1a2e;
    --text-light: #6b7280;
    --card-bg: #ffffff;
    --card-shadow: 0 8px 24px rgba(0,0,0,0.08);
    --border: #e5e7eb;
    --radius: 16px;
    --transition: 0.3s ease;
}

body.dark {
    --primary: #818cf8;
    --primary-dark: #6366f1;
    --bg: #0f0f23;
    --bg-alt: #1a1a2e;
    --text: #e5e7eb;
    --text-light: #9ca3af;
    --card-bg: #1e1e36;
    --card-shadow: 0 8px 24px rgba(0,0,0,0.4);
    --border: #374151;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background var(--transition), color var(--transition);
}

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

.header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

.logo i {
    font-size: 1.6rem;
}

.nav ul {
    display: flex;
    list-style: none;
    gap: 24px;
}

.nav a {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    transition: color var(--transition);
}

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

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

.btn-icon {
    background: none;
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text);
    font-size: 1.2rem;
    transition: all var(--transition);
}

.btn-icon:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.hamburger {
    display: none;
}

.hero {
    padding: 60px 0 40px;
    text-align: center;
    background: linear-gradient(135deg, var(--bg-alt) 0%, var(--bg) 100%);
}

.hero h1 {
    font-size: 2.2rem;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--primary), #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 24px;
}

.search-bar {
    display: flex;
    max-width: 500px;
    margin: 0 auto 16px;
    border-radius: 50px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.search-bar input {
    flex: 1;
    padding: 14px 20px;
    border: none;
    outline: none;
    font-size: 1rem;
    background: var(--card-bg);
    color: var(--text);
}

.search-bar button {
    padding: 14px 24px;
    background: var(--primary);
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    transition: background var(--transition);
}

.search-bar button:hover {
    background: var(--primary-dark);
}

.filter-bar {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.filter-bar select {
    padding: 10px 16px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--card-bg);
    color: var(--text);
    font-size: 0.95rem;
    cursor: pointer;
}

.card-grid {
    padding: 40px 0;
}

.card-grid .container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--card-shadow);
    transition: transform var(--transition), box-shadow var(--transition);
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0,0,0,0.12);
}

.card-icon {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 12px;
}

.card h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.card p {
    color: var(--text-light);
    font-size: 0.95rem;
    flex: 1;
    margin-bottom: 12px;
}

.card-meta {
    display: flex;
    gap: 12px;
    align-items: center;
    font-size: 0.85rem;
    margin-bottom: 12px;
}

.category {
    background: var(--bg-alt);
    padding: 4px 10px;
    border-radius: 20px;
    color: var(--primary);
}

.rating {
    color: #f59e0b;
}

.price {
    font-weight: 600;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background: var(--primary);
    color: #fff;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    text-align: center;
    transition: background var(--transition);
    border: none;
    cursor: pointer;
}

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

.stats-section {
    padding: 40px 0;
    background: var(--bg-alt);
}

.stats-section h2 {
    text-align: center;
    margin-bottom: 24px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    box-shadow: var(--card-shadow);
}

.stat-card i {
    font-size: 2rem;
    color: var(--primary);
}

.stat-card span {
    font-size: 1.8rem;
    font-weight: 700;
    display: block;
}

.heatmap-container {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    min-height: 200px;
    box-shadow: var(--card-shadow);
}

.footer {
    background: var(--bg-alt);
    padding: 32px 0;
    text-align: center;
    border-top: 1px solid var(--border);
}

.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 16px;
}

.footer-links a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 0.9rem;
}

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

.no-data {
    text-align: center;
    color: var(--text-light);
    padding: 40px;
}

/* Admin */
.admin-login {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: var(--bg-alt);
}

.login-container {
    background: var(--card-bg);
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: var(--card-shadow);
    width: 100%;
    max-width: 400px;
}

.login-container h2 {
    text-align: center;
    margin-bottom: 24px;
}

.login-container input {
    width: 100%;
    padding: 12px;
    margin-bottom: 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
}

.login-container button {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
}

.back-link {
    text-align: center;
    margin-top: 16px;
}

.admin-page {
    background: var(--bg);
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
}

.admin-header h1 {
    font-size: 1.4rem;
}

.admin-main {
    padding: 24px;
    max-width: 1000px;
    margin: 0 auto;
}

.admin-form {
    background: var(--card-bg);
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--card-shadow);
    margin-bottom: 24px;
}

.admin-form h2 {
    margin-bottom: 16px;
}

.admin-form label {
    display: block;
    margin-bottom: 12px;
}

.admin-form input, .admin-form textarea, .admin-form select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
    margin-top: 4px;
}

.item-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 12px;
    background: var(--bg-alt);
}

.item-row input, .item-row select {
    margin: 0;
}

.remove-item {
    background: #ef4444;
    grid-column: span 2;
}

.remove-item:hover {
    background: #dc2626;
}

.save {
    margin-top: 16px;
}

.ai-result {
    margin-top: 16px;
    padding: 16px;
    background: var(--bg-alt);
    border-radius: 8px;
}

.ai-result pre {
    white-space: pre-wrap;
    word-wrap: break-word;
}

.success {
    background: #10b981;
    color: #fff;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 16px;
}

.error {
    background: #ef4444;
    color: #fff;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 16px;
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--card-bg);
        border-bottom: 1px solid var(--border);
        padding: 20px;
    }

    .nav.active {
        display: block;
    }

    .nav ul {
        flex-direction: column;
        gap: 16px;
    }

    .hero h1 {
        font-size: 1.6rem;
    }

    .filter-bar {
        flex-direction: column;
        align-items: center;
    }

    .item-row {
        grid-template-columns: 1fr;
    }
}