:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-card: #1c2128;
    --bg-hover: #21262d;
    --bg-input: #0d1117;
    --border-color: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --accent-hover: #79b8ff;
    --success: #238636;
    --warning: #d29922;
    --danger: #f85149;
    --ad-bg: #21262d;
    --shadow: rgba(0,0,0,0.3);
    --badge-free-bg: rgba(35, 134, 54, 0.2);
    --badge-free-color: #3fb950;
    --badge-freemium-bg: rgba(210, 153, 34, 0.2);
    --badge-freemium-color: #d29922;
    --badge-paid-bg: rgba(248, 81, 73, 0.2);
    --badge-paid-color: #f85149;
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f6f8fa;
    --bg-card: #ffffff;
    --bg-hover: #f3f4f6;
    --bg-input: #f6f8fa;
    --border-color: #d0d7de;
    --text-primary: #1f2328;
    --text-secondary: #656d76;
    --accent: #0969da;
    --accent-hover: #0550ae;
    --success: #1a7f37;
    --warning: #9a6700;
    --danger: #cf222e;
    --ad-bg: #f6f8fa;
    --shadow: rgba(31, 35, 40, 0.1);
    --badge-free-bg: rgba(31, 136, 61, 0.1);
    --badge-free-color: #1a7f37;
    --badge-freemium-bg: rgba(154, 103, 0, 0.1);
    --badge-freemium-color: #9a6700;
    --badge-paid-bg: rgba(207, 34, 46, 0.1);
    --badge-paid-color: #cf222e;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color 0.3s, color 0.3s;
}

/* Header */
.header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.3s;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.logo i {
    color: var(--accent);
    font-size: 1.75rem;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.search-box {
    position: relative;
    width: 300px;
}

.search-box input {
    width: 100%;
    padding: 0.6rem 1rem 0.6rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-input);
    color: var(--text-primary);
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}

.search-box input:focus {
    border-color: var(--accent);
}

.search-box input::placeholder {
    color: var(--text-secondary);
}

.search-box i {
    position: absolute;
    left: 0.8rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-input);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: all 0.2s;
}

.theme-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Nav */
.nav-menu {
    display: flex;
    gap: 0.5rem;
    list-style: none;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--text-primary);
    background-color: var(--bg-hover);
}

/* Hero */
.hero {
    text-align: center;
    padding: 3rem 0 2rem;
}

.hero h1 {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(90deg, var(--accent), #a371f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Categories */
.categories {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    padding: 1rem 0 2rem;
}

.category-btn {
    padding: 0.4rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.category-btn:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--accent);
}

.category-btn.active {
    background-color: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* Ad Banner */
.ad-banner {
    background-color: var(--ad-bg);
    border: 1px dashed var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.ad-banner .ad-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

/* Section Title */
.section-title {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-title i {
    color: var(--accent);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.view-all {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.view-all:hover {
    color: var(--accent-hover);
}

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.tools-grid.cols-4 {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

.tool-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    transition: all 0.2s;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
    position: relative;
}

.tool-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--shadow);
}

.tool-badges-top {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    display: flex;
    gap: 0.3rem;
}

.tool-badge-tag {
    font-size: 0.65rem;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-tag-hot {
    background-color: var(--badge-paid-bg);
    color: var(--badge-paid-color);
}

.badge-tag-new {
    background-color: var(--badge-free-bg);
    color: var(--badge-free-color);
}

.tool-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.tool-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    flex-shrink: 0;
}

.tool-icon.blue { background-color: rgba(88, 166, 255, 0.15); color: var(--accent); }
.tool-icon.green { background-color: rgba(35, 134, 54, 0.15); color: #3fb950; }
.tool-icon.purple { background-color: rgba(163, 113, 247, 0.15); color: #a371f7; }
.tool-icon.orange { background-color: rgba(210, 153, 34, 0.15); color: var(--warning); }
.tool-icon.red { background-color: rgba(248, 81, 73, 0.15); color: var(--danger); }
.tool-icon.cyan { background-color: rgba(6, 182, 212, 0.15); color: #06b6d4; }
.tool-icon.yellow { background-color: rgba(234, 179, 8, 0.15); color: #eab308; }

.tool-name {
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
}

.tool-tag {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.tool-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    line-height: 1.5;
}

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

.tool-visit {
    font-size: 0.85rem;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.tool-badge {
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-weight: 600;
}

.tool-badge.badge-free {
    background-color: var(--badge-free-bg);
    color: var(--badge-free-color);
}

.tool-badge.badge-freemium {
    background-color: var(--badge-freemium-bg);
    color: var(--badge-freemium-color);
}

.tool-badge.badge-paid {
    background-color: var(--badge-paid-bg);
    color: var(--badge-paid-color);
}

/* Detail Page */
.detail-page {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.detail-hero {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 2rem;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    margin-bottom: 1.5rem;
}

.detail-icon-large {
    width: 80px;
    height: 80px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    flex-shrink: 0;
}

.detail-icon-large.blue { background-color: rgba(88, 166, 255, 0.15); color: var(--accent); }
.detail-icon-large.green { background-color: rgba(35, 134, 54, 0.15); color: #3fb950; }
.detail-icon-large.purple { background-color: rgba(163, 113, 247, 0.15); color: #a371f7; }
.detail-icon-large.orange { background-color: rgba(210, 153, 34, 0.15); color: var(--warning); }
.detail-icon-large.red { background-color: rgba(248, 81, 73, 0.15); color: var(--danger); }
.detail-icon-large.cyan { background-color: rgba(6, 182, 212, 0.15); color: #06b6d4; }
.detail-icon-large.yellow { background-color: rgba(234, 179, 8, 0.15); color: #eab308; }

.detail-hero-info h1 {
    font-size: 1.8rem;
    margin-bottom: 0.75rem;
}

.detail-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
}

.detail-tags span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.detail-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.stat-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background-color: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--accent);
}

.stat-content {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.detail-section {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.detail-section-title {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
}

.detail-section-title i {
    color: var(--accent);
}

.detail-description {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.detail-description p {
    margin: 0;
}

.feature-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 0.8rem;
    background-color: var(--bg-secondary);
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.feature-item i.green { color: #3fb950; }
.feature-item i.orange { color: var(--warning); }
.feature-item i.cyan { color: #06b6d4; }
.feature-item i.blue { color: var(--accent); }

.use-cases {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.use-case-tag {
    padding: 0.4rem 0.8rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.detail-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.btn-large {
    flex: 1;
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
}

.detail-actions .btn-primary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.detail-actions .btn-secondary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

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

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

.footer-copyright {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Button */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--accent);
    color: #fff;
}

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

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-hover);
}

/* Scroll Top */
.scroll-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--accent);
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    z-index: 1000;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    background-color: var(--accent-hover);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: rgba(0, 0, 0, 0.9);
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 0.9rem;
    opacity: 0;
    transition: all 0.3s;
    z-index: 1001;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* Admin Filters */
.admin-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
    align-items: center;
}

.admin-search-box {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
    min-width: 300px;
}

.admin-search-box i {
    position: absolute;
    left: 0.8rem;
    color: var(--text-secondary);
}

.admin-search-box input {
    width: 100%;
    padding: 0.6rem 1rem 0.6rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-input);
    color: var(--text-primary);
    font-size: 0.95rem;
    outline: none;
    position: relative;
}

.admin-search-box input:focus {
    border-color: var(--accent);
}

.admin-category-filter select {
    padding: 0.6rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-input);
    color: var(--text-primary);
    font-size: 0.95rem;
    outline: none;
    min-width: 150px;
}

.admin-category-filter select:focus {
    border-color: var(--accent);
}

/* Admin Styles */
.admin-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}

.admin-table th,
.admin-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.admin-table th {
    background-color: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-secondary);
}

.admin-table tbody tr:hover {
    background-color: var(--bg-hover);
}

.admin-actions {
    display: flex;
    gap: 0.5rem;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    z-index: 2000;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: transform 0.3s;
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.1rem;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0.25rem;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal form {
    padding: 1.25rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.3rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--bg-input);
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--accent);
}

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

.form-check {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0;
}

.form-check input {
    width: auto;
}

.form-check label {
    margin-bottom: 0;
}