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

:root {
    --primary-color: #06B6D4;
    --primary-light: #22D3EE;
    --primary-dark: #0891B2;
    --secondary-color: #1E293B;
    --secondary-light: #334155;
    --secondary-dark: #0F172A;
    --accent-color: #F472B6;
    --text-primary: #FFFFFF;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background-color: var(--secondary-dark);
    color: var(--text-primary);
    line-height: 1.6;
}

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

header {
    background: linear-gradient(135deg, var(--secondary-dark) 0%, var(--secondary-color) 100%);
    padding: 20px 0;
    border-bottom: 1px solid var(--secondary-light);
    position: sticky;
    top: 0;
    z-index: 100;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

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

.logo-icon {
    font-size: 28px;
}

.logo-text h1 {
    font-size: 22px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text .tagline {
    font-size: 12px;
    color: var(--text-muted);
}

nav ul {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    list-style: none;
}

nav ul li a {
    display: block;
    padding: 8px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    border-radius: 20px;
    transition: all 0.3s ease;
}

nav ul li a:hover {
    color: var(--text-primary);
    background-color: var(--secondary-light);
}

nav ul li.active a {
    color: var(--text-primary);
    background-color: var(--primary-color);
}

.hero {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-dark) 100%);
    padding: 60px 0;
}

.hero .container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 40px;
}

.hero-content h2 {
    font-size: 36px;
    margin-bottom: 15px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-bottom: 30px;
}

.stat-item {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 28px;
    font-weight: bold;
    color: var(--primary-light);
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
}

.hero-buttons {
    display: flex;
    gap: 15px;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 25px;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn.primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
}

.btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(6, 182, 212, 0.3);
}

.btn.secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 2px solid var(--primary-color);
}

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

.hero-visual {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.hero-visual .tool-card {
    background-color: var(--secondary-light);
    padding: 25px;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s ease;
}

.hero-visual .tool-card:hover {
    background-color: var(--primary-color);
    transform: translateY(-5px);
}

.hero-visual .tool-icon {
    font-size: 32px;
    margin-bottom: 10px;
}

.hero-visual .tool-name {
    font-size: 14px;
    color: var(--text-secondary);
}

.hero-visual .tool-card:hover .tool-name {
    color: white;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.section-header h3 {
    font-size: 24px;
    color: var(--text-primary);
}

.view-all {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 14px;
}

.view-all:hover {
    text-decoration: underline;
}

.featured-tools,
.categories-section,
.features-section {
    padding: 50px 0;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.tool-card {
    background-color: var(--secondary-color);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid var(--secondary-light);
    transition: all 0.3s ease;
}

.tool-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
}

.tool-icon-wrapper {
    font-size: 36px;
    margin-bottom: 15px;
}

.tool-card h4 {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.tool-card p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 15px;
}

.tool-tags {
    margin-bottom: 15px;
}

.tool-tags span {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--secondary-light);
    color: var(--text-secondary);
    font-size: 12px;
    border-radius: 15px;
    margin-right: 8px;
}

.tool-tags span:last-child {
    background-color: var(--primary-color);
    color: white;
}

.use-btn {
    display: block;
    padding: 10px;
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    text-decoration: none;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
}

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

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 15px;
}

.category-card {
    background-color: var(--secondary-color);
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    text-decoration: none;
    color: inherit;
    border: 1px solid var(--secondary-light);
    transition: all 0.3s ease;
}

.category-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-3px);
}

.category-icon {
    font-size: 32px;
    margin-bottom: 10px;
}

.category-name {
    display: block;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.category-count {
    font-size: 13px;
    color: var(--text-muted);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.feature-item {
    background-color: var(--secondary-color);
    padding: 25px;
    border-radius: 12px;
    text-align: center;
    border: 1px solid var(--secondary-light);
}

.feature-icon {
    font-size: 36px;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.feature-item h4 {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.feature-item p {
    font-size: 14px;
    color: var(--text-secondary);
}

.cta-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    padding: 50px 0;
    text-align: center;
}

.cta-section h3 {
    font-size: 28px;
    margin-bottom: 15px;
    color: white;
}

.cta-section p {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 30px;
}

.cta-section .btn.primary {
    background-color: white;
    color: var(--primary-color);
}

.cta-section .btn.secondary {
    border-color: white;
    color: white;
}

.cta-section .btn.secondary:hover {
    background-color: white;
    color: var(--primary-color);
}

.page-header {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-dark) 100%);
    padding: 40px 0;
    margin-bottom: 30px;
}

.page-header h2 {
    font-size: 28px;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.page-header p {
    font-size: 16px;
    color: var(--text-secondary);
}

.tools-content,
.features-content,
.usage-content,
.pricing-content,
.contact-content {
    padding-bottom: 50px;
}

.search-bar {
    display: flex;
    gap: 10px;
    max-width: 500px;
    margin: 0 auto 25px;
}

.search-bar input {
    flex: 1;
    padding: 12px 20px;
    background-color: var(--secondary-color);
    border: 1px solid var(--secondary-light);
    border-radius: 25px;
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
}

.search-bar input:focus {
    border-color: var(--primary-color);
}

.search-btn {
    padding: 12px 20px;
    background-color: var(--primary-color);
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-size: 16px;
}

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

.filter-tab {
    padding: 8px 20px;
    background-color: var(--secondary-color);
    border: 1px solid var(--secondary-light);
    color: var(--text-secondary);
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
}

.filter-tab:hover,
.filter-tab.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 40px;
}

.pagination a,
.pagination span {
    padding: 10px 15px;
    text-decoration: none;
    color: var(--text-secondary);
    background-color: var(--secondary-color);
    border-radius: 5px;
    transition: all 0.3s ease;
}

.pagination span.current {
    background-color: var(--primary-color);
    color: white;
}

.pagination a:hover {
    background-color: var(--secondary-light);
}

.feature-block {
    display: flex;
    gap: 30px;
    background-color: var(--secondary-color);
    padding: 30px;
    border-radius: 12px;
    margin-bottom: 20px;
    border: 1px solid var(--secondary-light);
}

.feature-block .feature-icon {
    font-size: 48px;
    color: var(--primary-color);
    flex-shrink: 0;
}

.feature-block h3 {
    font-size: 22px;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.feature-block p {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 15px;
    line-height: 1.8;
}

.feature-block ul {
    padding-left: 20px;
}

.feature-block li {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.feature-block li strong {
    color: var(--text-primary);
}

.tutorial-section {
    background-color: var(--secondary-color);
    padding: 30px;
    border-radius: 12px;
    margin-bottom: 20px;
    border: 1px solid var(--secondary-light);
}

.tutorial-section h3 {
    font-size: 22px;
    color: var(--text-primary);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
}

.tutorial-content h4 {
    font-size: 18px;
    color: var(--primary-light);
    margin-bottom: 10px;
}

.tutorial-content p {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 15px;
    line-height: 1.8;
}

.tutorial-content ul {
    padding-left: 20px;
    margin-bottom: 15px;
}

.tutorial-content li {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.tutorial-content li strong {
    color: var(--text-primary);
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-bottom: 50px;
}

.pricing-card {
    background-color: var(--secondary-color);
    border-radius: 15px;
    overflow: hidden;
    border: 1px solid var(--secondary-light);
    position: relative;
    transition: all 0.3s ease;
}

.pricing-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
}

.pricing-card.popular {
    border-color: var(--primary-color);
    transform: scale(1.02);
}

.popular-badge {
    position: absolute;
    top: 0;
    right: 0;
    background-color: var(--primary-color);
    color: white;
    padding: 5px 15px;
    font-size: 12px;
    font-weight: bold;
    border-radius: 0 15px 0 10px;
}

.pricing-header {
    padding: 30px;
    text-align: center;
    border-bottom: 1px solid var(--secondary-light);
}

.pricing-header h3 {
    font-size: 22px;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.pricing-header .price {
    display: block;
    font-size: 48px;
    font-weight: bold;
    color: var(--primary-light);
}

.pricing-header .period {
    display: block;
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 5px;
}

.pricing-header .discount {
    display: block;
    font-size: 12px;
    color: var(--accent-color);
    margin-top: 10px;
}

.pricing-features {
    padding: 25px;
}

.pricing-features ul {
    list-style: none;
}

.pricing-features li {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.btn-primary {
    display: block;
    width: 100%;
    padding: 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.feature-comparison {
    background-color: var(--secondary-color);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--secondary-light);
}

.feature-comparison h3 {
    font-size: 22px;
    color: var(--text-primary);
    margin-bottom: 25px;
}

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

.feature-comparison th,
.feature-comparison td {
    padding: 15px;
    text-align: center;
    border-bottom: 1px solid var(--secondary-light);
}

.feature-comparison th {
    background-color: var(--secondary-light);
    color: var(--text-primary);
    font-weight: 600;
}

.feature-comparison td:first-child {
    text-align: left;
    color: var(--text-secondary);
}

.feature-comparison tbody tr:hover {
    background-color: var(--secondary-light);
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.info-item {
    display: flex;
    gap: 15px;
    background-color: var(--secondary-color);
    padding: 20px;
    border-radius: 10px;
    border: 1px solid var(--secondary-light);
}

.info-icon {
    font-size: 28px;
    color: var(--primary-color);
    flex-shrink: 0;
}

.info-text h4 {
    font-size: 16px;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.info-text p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 3px;
}

.feedback-form {
    background-color: var(--secondary-color);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--secondary-light);
}

.feedback-form h3 {
    font-size: 20px;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    background-color: var(--secondary-dark);
    border: 1px solid var(--secondary-light);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
}

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

.form-group textarea {
    height: 120px;
    resize: vertical;
}

.feedback-form button {
    width: 100%;
    padding: 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
}

.feedback-form button:hover {
    background-color: var(--primary-light);
}

footer {
    background-color: var(--secondary-dark);
    padding: 40px 0;
    border-top: 1px solid var(--secondary-light);
    margin-top: 50px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer-brand .logo-icon {
    font-size: 24px;
}

.footer-brand h4 {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 3px;
}

.footer-brand p {
    font-size: 13px;
    color: var(--text-muted);
}

.footer-links h5 {
    font-size: 16px;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    font-size: 14px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-contact h5 {
    font-size: 16px;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.footer-contact p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--secondary-light);
}

.footer-bottom p {
    font-size: 13px;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        align-items: flex-start;
    }

    nav ul {
        margin-top: 10px;
    }

    .hero-content h2 {
        font-size: 28px;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: 20px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .feature-block {
        flex-direction: column;
    }

    .feature-block .feature-icon {
        align-self: flex-start;
    }

    .pricing-card.popular {
        transform: none;
    }

    .feature-comparison table {
        font-size: 12px;
    }

    .feature-comparison th,
    .feature-comparison td {
        padding: 10px 5px;
    }
}