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

:root {
    --primary: #6C63FF;
    --primary-dark: #5A52D5;
    --primary-light: #8B85FF;
    --bg: #F8F9FE;
    --bg-card: #FFFFFF;
    --text: #2D2D3A;
    --text-secondary: #6B6B80;
    --shadow: 0 8px 30px rgba(108, 99, 255, 0.08);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --border: #E8E8F0;
    --gradient: linear-gradient(135deg, #6C63FF, #A78BFA);
    --hero-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

body.dark {
    --bg: #1A1A2E;
    --bg-card: #252540;
    --text: #EAEAFF;
    --text-secondary: #A0A0B8;
    --shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
    --border: #3A3A55;
    --hero-bg: linear-gradient(135deg, #0F0F23, #2A1B42);
}

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: var(--transition);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navbar */
.navbar {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0,0,0,0.04);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-logo {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.nav-links {
    display: flex;
    gap: 8px;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary);
    background: rgba(108, 99, 255, 0.08);
}

.admin-link {
    background: var(--gradient) !important;
    color: white !important;
    padding: 8px 20px !important;
}

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

.theme-btn {
    background: none;
    border: 2px solid var(--border);
    color: var(--text);
    width: 42px;
    height: 42px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.1rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.hamburger {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text);
    cursor: pointer;
}

/* Hero */
.hero {
    background: var(--hero-bg);
    padding: 100px 24px 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 70%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 2.8rem;
    font-weight: 800;
    color: white;
    margin-bottom: 20px;
    line-height: 1.2;
    letter-spacing: -0.5px;
}

.hero p {
    font-size: 1.15rem;
    color: rgba(255,255,255,0.85);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.search-box {
    display: flex;
    align-items: center;
    background: white;
    border-radius: 60px;
    padding: 6px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
    max-width: 600px;
    margin: 0 auto;
}

.search-box .search-icon {
    color: var(--text-secondary);
    font-size: 1.1rem;
    padding: 0 18px;
}

.search-box input {
    flex: 1;
    border: none;
    outline: none;
    padding: 14px 0;
    font-size: 1rem;
    background: transparent;
    color: var(--text);
}

.search-box input::placeholder {
    color: #aaa;
}

.search-box button {
    background: var(--gradient);
    border: none;
    color: white;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

/* Categories */
.categories-section {
    padding: 50px 0 20px;
}

.section-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--text);
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--gradient);
    border-radius: 4px;
    margin: 12px auto 0;
}

.category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 30px;
}

.filter-btn {
    padding: 10px 24px;
    border: 2px solid var(--border);
    background: var(--bg-card);
    border-radius: 40px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
}

.filter-btn:hover, .filter-btn.active {
    background: var(--gradient);
    border-color: transparent;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(108, 99, 255, 0.3);
}

/* Tools Grid */
.tools-section {
    padding: 20px 0 80px;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 28px;
}

.tool-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 0;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: var(--transition);
    overflow: hidden;
    position: relative;
}

.tool-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 50px rgba(108, 99, 255, 0.15);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 22px 0;
}

.card-category {
    background: rgba(108, 99, 255, 0.1);
    color: var(--primary);
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.favorite-btn {
    background: none;
    border: none;
    font-size: 1.3rem;
    color: #ccc;
    cursor: pointer;
    transition: var(--transition);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.favorite-btn.active {
    color: #FF5A5A;
    background: rgba(255, 90, 90, 0.1);
}

.favorite-btn:hover {
    transform: scale(1.2);
}

.card-body {
    padding: 16px 22px 22px;
}

.card-body h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text);
}

.card-body p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 16px;
    line-height: 1.5;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.rating {
    color: #FFB800;
    font-size: 0.9rem;
}

.rating small {
    color: var(--text-secondary);
    margin-left: 4px;
}

.price {
    font-weight: 600;
    color: var(--primary);
    font-size: 0.95rem;
}

.btn-detail {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    background: var(--gradient);
    color: white;
    text-decoration: none;
    border-radius: 40px;
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition);
}

.btn-detail:hover {
    transform: translateX(4px);
    box-shadow: 0 8px 25px rgba(108, 99, 255, 0.4);
}

.no-tools {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-secondary);
}

.no-tools i {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--border);
}

/* Footer */
.footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    padding: 60px 24px 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand h3 {
    font-size: 1.4rem;
    color: var(--primary);
    margin-bottom: 12px;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.footer-links h4, .footer-contact h4 {
    font-size: 1rem;
    margin-bottom: 16px;
    color: var(--text);
}

.footer-links a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 10px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary);
    padding-left: 4px;
}

.footer-contact p {
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Login */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--hero-bg);
    padding: 20px;
}

.login-card {
    background: var(--bg-card);
    padding: 50px 40px;
    border-radius: var(--radius);
    box-shadow: 0 30px 80px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 420px;
}

.login-card h2 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 1.6rem;
    color: var(--text);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--text);
    font-size: 0.9rem;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    background: var(--bg);
    color: var(--text);
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus, .form-group textarea:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 4px rgba(108, 99, 255, 0.1);
}

.btn-primary {
    width: 100%;
    padding: 14px;
    background: var(--gradient);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(108, 99, 255, 0.3);
}

.login-footer {
    text-align: center;
    margin-top: 20px;
}

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

.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-size: 0.9rem;
}

.alert-error {
    background: #FEE2E2;
    color: #DC2626;
    border: 1px solid #FECACA;
}

/* Admin */
.admin-container {
    display: flex;
    min-height: calc(100vh - 70px);
    max-width: 1280px;
    margin: 0 auto;
    padding: 24px;
    gap: 30px;
}

.admin-sidebar {
    width: 240px;
    flex-shrink: 0;
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border);
    height: fit-content;
    position: sticky;
    top: 100px;
}

.admin-sidebar h3 {
    font-size: 1rem;
    color: var(--text);
    margin-bottom: 16px;
}

.admin-sidebar ul {
    list-style: none;
}

.admin-sidebar li a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.95rem;
}

.admin-sidebar li a:hover, .admin-sidebar li a.active {
    background: rgba(108, 99, 255, 0.08);
    color: var(--primary);
}

.admin-content {
    flex: 1;
}

.admin-section {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 30px;
    border: 1px solid var(--border);
    margin-bottom: 30px;
}

.admin-section h2 {
    font-size: 1.4rem;
    margin-bottom: 24px;
    color: var(--text);
}

.admin-form .form-group {
    margin-bottom: 20px;
}

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

.admin-table th, .admin-table td {
    text-align: left;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    font-size: 0.95rem;
}

.admin-table th {
    background: rgba(108, 99, 255, 0.04);
    font-weight: 600;
    color: var(--text-secondary);
}

.admin-table tr:hover td {
    background: rgba(108, 99, 255, 0.02);
}

.btn-danger {
    padding: 8px 16px;
    background: #EF4444;
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-decoration: none;
    font-size: 0.85rem;
    transition: var(--transition);
}

.btn-danger:hover {
    background: #DC2626;
}

/* Tool Detail Page */
.tool-detail-container {
    max-width: 900px;
    margin: 40px auto;
    padding: 0 24px;
}

.tool-detail-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 40px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.tool-detail-card h1 {
    font-size: 2rem;
    margin-bottom: 12px;
    color: var(--text);
}

.tool-detail-card .category-badge {
    display: inline-block;
    padding: 6px 18px;
    background: rgba(108, 99, 255, 0.1);
    color: var(--primary);
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.tool-detail-card .description {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.detail-meta {
    display: flex;
    gap: 30px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.detail-meta span {
    font-size: 1rem;
    color: var(--text);
}

.detail-meta strong {
    font-weight: 600;
}

.rating-section {
    margin-bottom: 30px;
}

.rating-section h3 {
    font-size: 1.2rem;
    margin-bottom: 16px;
}

.star-rating {
    display: flex;
    gap: 6px;
    margin-bottom: 16px;
}

.star-rating i {
    font-size: 1.5rem;
    color: #ddd;
    cursor: pointer;
    transition: var(--transition);
}

.star-rating i.active, .star-rating i:hover {
    color: #FFB800;
}

.comment-box {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.comment-box input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    background: var(--bg);
    color: var(--text);
}

.comment-box button {
    padding: 12px 24px;
    background: var(--gradient);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.comment-box button:hover {
    transform: translateY(-2px);
}

.comments-list {
    margin-top: 20px;
}

.comment-item {
    padding: 16px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.comment-item .comment-text {
    color: var(--text);
}

.comment-item .comment-rating {
    color: #FFB800;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    margin-top: 20px;
    transition: var(--transition);
}

.back-link:hover {
    gap: 12px;
}

/* Favorites Page */
.favorites-page {
    padding: 60px 24px;
    min-height: 60vh;
}

.favorites-page h1 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
}

/* Submit Page */
.submit-page {
    padding: 60px 24px;
    max-width: 700px;
    margin: 0 auto;
}

.submit-page h1 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
}

/* About Page */
.about-page {
    padding: 60px 24px;
    max-width: 800px;
    margin: 0 auto;
}

.about-page h1 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 30px;
}

.about-page p {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--bg-card);
        padding: 20px;
        box-shadow: 0 20px 40px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .hamburger {
        display: block;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .admin-container {
        flex-direction: column;
    }
    
    .admin-sidebar {
        width: 100%;
        position: static;
    }
    
    .admin-sidebar ul {
        display: flex;
        gap: 10px;
        flex-wrap: wrap;
    }
    
    .search-box {
        flex-direction: row;
    }
    
    .detail-meta {
        flex-direction: column;
        gap: 12px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.6rem;
    }
    
    .tool-detail-card {
        padding: 24px;
    }
}

/* Static pages styling */
.page-content {
    min-height: calc(100vh - 200px);
    padding: 60px 24px;
}
.page-content .container {
    max-width: 800px;
    margin: 0 auto;
}
.page-content h1 {
    font-size: 2rem;
    margin-bottom: 30px;
    text-align: center;
}
.page-content p {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 20px;
}