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

:root {
    --bg: #f5f7fa;
    --card-bg: #ffffff;
    --text: #1a1a2e;
    --text-muted: #6c757d;
    --primary: #4a90d9;
    --primary-hover: #357abd;
    --border: #e0e0e0;
    --shadow: 0 8px 24px rgba(0,0,0,0.08);
    --radius: 16px;
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --bg: #0f0f1a;
    --card-bg: #1a1a2e;
    --text: #e0e0e0;
    --text-muted: #a0a0b0;
    --primary: #6b9ff2;
    --primary-hover: #4a7fd4;
    --border: #2a2a3e;
    --shadow: 0 8px 24px rgba(0,0,0,0.4);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: var(--transition);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

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

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

.logo:hover {
    transform: scale(1.05);
}

.nav {
    display: flex;
    gap: 20px;
}

.nav a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    transition: var(--transition);
}

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

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

.theme-btn {
    background: none;
    border: 2px solid var(--border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
}

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

.hamburger {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text);
}

/* Hero */
.hero {
    text-align: center;
    padding: 60px 20px;
    background: linear-gradient(135deg, var(--primary) 0%, #6b5b95 100%);
    border-radius: var(--radius);
    margin: 30px 0;
    color: #fff;
}

.hero h1 {
    font-size: 2.4rem;
    margin-bottom: 16px;
    line-height: 1.3;
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Search */
.search-section {
    margin-bottom: 30px;
}

.search-form {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    background: var(--card-bg);
    padding: 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.search-form input,
.search-form select,
.search-form button {
    padding: 12px 20px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 1rem;
    background: var(--bg);
    color: var(--text);
    transition: var(--transition);
}

.search-form input:focus,
.search-form select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(74,144,217,0.2);
}

.search-form button {
    background: var(--primary);
    color: #fff;
    border: none;
    cursor: pointer;
    font-weight: 600;
}

.search-form button:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
}

/* Cards Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 32px rgba(0,0,0,0.15);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 12px;
}

.card h3 {
    font-size: 1.3rem;
    margin-bottom: 8px;
}

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

.card-meta {
    display: flex;
    gap: 16px;
    margin-bottom: 12px;
    font-size: 0.9rem;
}

.card-tags {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.card-tags span {
    background: var(--bg);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.download-btn {
    display: inline-block;
    padding: 12px 32px;
    background: linear-gradient(135deg, var(--primary), #6b5b95);
    color: #fff;
    text-decoration: none;
    border-radius: 30px;
    font-weight: 600;
    transition: var(--transition);
    width: 100%;
    text-align: center;
}

.download-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 16px rgba(74,144,217,0.4);
}

.no-result {
    text-align: center;
    padding: 60px;
    color: var(--text-muted);
    font-size: 1.2rem;
}

/* Reviews */
.reviews-section {
    margin-bottom: 40px;
}

.reviews-section h2 {
    text-align: center;
    margin-bottom: 24px;
    font-size: 1.8rem;
}

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

.review-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.review-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
}

.review-user {
    font-weight: 600;
}

.review-text {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Footer */
.footer {
    background: var(--card-bg);
    padding: 30px 0;
    margin-top: auto;
    border-top: 1px solid var(--border);
}

.footer-inner {
    text-align: center;
}

.footer a {
    color: var(--primary);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* Admin */
.admin-login-body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary), #6b5b95);
}

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

.admin-login-container h1 {
    margin-bottom: 20px;
    color: var(--primary);
}

.admin-login-form input {
    width: 100%;
    padding: 12px;
    margin-bottom: 12px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 1rem;
    background: var(--bg);
    color: var(--text);
}

.admin-login-form button {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.admin-login-form button:hover {
    background: var(--primary-hover);
}

.error-msg {
    color: #e74c3c;
    margin-bottom: 12px;
}

.success-msg {
    color: #27ae60;
    margin-bottom: 12px;
}

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

.admin-main {
    padding: 40px 0;
}

.admin-form {
    background: var(--card-bg);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 30px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.admin-form input,
.admin-form textarea,
.admin-form button {
    padding: 12px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 1rem;
    background: var(--bg);
    color: var(--text);
}

.admin-form textarea {
    min-height: 80px;
    resize: vertical;
}

.admin-form button {
    background: var(--primary);
    color: #fff;
    border: none;
    cursor: pointer;
    font-weight: 600;
}

.admin-form button:hover {
    background: var(--primary-hover);
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.admin-table th,
.admin-table td {
    padding: 12px;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

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

.delete-btn {
    padding: 6px 12px;
    background: #e74c3c;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

.delete-btn:hover {
    background: #c0392b;
}

/* Responsive */
@media (max-width: 768px) {
    .nav {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--card-bg);
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow);
    }

    .nav.active {
        display: flex;
    }

    .hamburger {
        display: block;
    }

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

    .search-form {
        flex-direction: column;
    }

    .cards-grid {
        grid-template-columns: 1fr;
    }

    .admin-table {
        font-size: 0.8rem;
    }
}