:root {
    --primary-color: #1a73e8;
    --primary-dark: #0d47a1;
    --primary-light: #64b5f6;
    --secondary-color: #0d1b2a;
    --accent-color: #00bcd4;
    --gray-medium: #e8eaf6;
    --text-primary: #263238;
    --text-secondary: #546e7a;
    --success-color: #28a745;
    --danger-color: #dc3545;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    padding-top: 76px;
    color: var(--text-primary);
    line-height: 1.6;
    background-color: #f8fafc;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-medium);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

.wide-container {
    width: 100%;
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.navbar {
    background-color: white !important;
    box-shadow: 0 2px 12px rgba(13, 27, 42, 0.08);
    padding: 0.75rem 0;
    transition: all 0.3s ease-in-out;
    z-index: 1030;
}

.navbar .wide-container {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    justify-content: space-between;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.6rem;
    color: var(--primary-color) !important;
    display: flex;
    align-items: center;
    white-space: nowrap;
}

.brand-icon {
    margin-right: 8px;
    font-size: 1.8rem;
}

.nav-link {
    font-weight: 500;
    padding: 0.5rem 0.9rem !important;
    color: var(--text-primary) !important;
    border-radius: 4px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    white-space: nowrap;
}

.nav-link i {
    margin-right: 6px;
    font-size: 1.1rem;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color) !important;
    background-color: rgba(26, 115, 232, 0.08);
}

.dropdown-menu {
    border: none;
    box-shadow: 0 8px 24px rgba(13, 27, 42, 0.12);
    border-radius: 8px;
    padding: 0.5rem 0;
    min-width: 220px;
    margin-top: 0.5rem;
    border-top: 3px solid var(--primary-color);
}

.dropdown-header {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0.5rem 1.25rem;
    margin-top: 0.25rem;
}

.dropdown-item {
    padding: 0.6rem 1.25rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    transition: all 0.2s ease;
}

.dropdown-item i {
    width: 20px;
    margin-right: 10px;
    color: var(--primary-color);
}

.dropdown-item:hover {
    background-color: rgba(26, 115, 232, 0.08);
    color: var(--primary-color);
    padding-left: 1.5rem;
}

.search-form {
    width: 100%;
    max-width: 320px;
}

.search-form .form-control {
    border-radius: 20px;
    padding: 0.5rem 1rem;
    border: 1px solid var(--gray-medium);
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.search-form .form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(26, 115, 232, 0.15);
    outline: none;
    transform: translateY(-1px);
}

.search-form .btn {
    border-radius: 20px;
    padding: 0.5rem 1.25rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    transition: all 0.3s ease;
}

.search-form .btn:hover {
    background-color: var(--primary-dark);
    box-shadow: 0 2px 8px rgba(26, 115, 232, 0.2);
}

.search-form .btn:disabled {
    background-color: var(--primary-light);
    cursor: not-allowed;
    box-shadow: none;
}

.hero-section {
    background: linear-gradient(135deg, #f5f7fa 0%, #e8eaf6 100%);
    border-radius: 12px;
    padding: 4rem 3rem;
    margin-top: 2rem;
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 40%;
    height: 100%;
    background: linear-gradient(45deg, rgba(26, 115, 232, 0.05) 0%, rgba(0, 188, 212, 0.05) 100%);
    clip-path: polygon(100% 0, 0 0, 100% 100%);
}

.hero-title {
    color: var(--secondary-color);
    font-weight: 700;
    font-size: 2.8rem;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-description {
    color: var(--text-secondary);
    font-size: 1.2rem;
    max-width: 800px;
    margin-bottom: 2rem;
}

.tool-tag {
    display: inline-block;
    padding: 0.35rem 1rem;
    background-color: rgba(26, 115, 232, 0.1);
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-right: 0.75rem;
    margin-bottom: 0.75rem;
    transition: all 0.2s ease;
    text-decoration: none;
}

.tool-tag:hover {
    background-color: rgba(26, 115, 232, 0.15);
    transform: translateY(-2px);
}

.section-title {
    color: var(--secondary-color);
    font-weight: 700;
    font-size: 1.8rem;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
}

.section-title i {
    color: var(--primary-color);
    margin-right: 0.75rem;
}

.tool-cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.tool-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(13, 27, 42, 0.08);
    transition: all 0.3s ease;
    border: 1px solid var(--gray-medium);
    padding: 2rem;
}

.tool-card:hover {
    transform: translateY(-8px) rotate(0.5deg);
    box-shadow: 0 16px 32px rgba(13, 27, 42, 0.12);
    border-color: var(--primary-light);
}

.card-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.card-title {
    color: var(--secondary-color);
    font-weight: 700;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.card-text {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.featured-tools {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
}

.featured-tool-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(13, 27, 42, 0.08);
    padding: 2.5rem;
    border-top: 4px solid var(--primary-color);
}

.featured-title {
    color: var(--secondary-color);
    font-weight: 700;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
}

.featured-title i {
    color: var(--primary-color);
    margin-right: 0.75rem;
    font-size: 1.5rem;
}

.featured-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.featured-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--gray-medium);
    display: flex;
    align-items: center;
}

.featured-list li:last-child {
    border-bottom: none;
}

.featured-list i {
    color: var(--accent-color);
    margin-right: 0.75rem;
    font-size: 1.1rem;
}

.popular-tools-section {
    background-color: white;
    border-radius: 12px;
    padding: 2.5rem;
    box-shadow: 0 4px 12px rgba(13, 27, 42, 0.08);
    margin-bottom: 3rem;
    border-left: 5px solid var(--accent-color);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
}

.tool-item {
    display: flex;
    align-items: center;
    padding: 1rem 1.25rem;
    border-radius: 10px;
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.2s ease;
    border: 1px solid var(--gray-medium);
    background-color: white;
}

.tool-item:hover {
    background-color: rgba(26, 115, 232, 0.05);
    border-color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(26, 115, 232, 0.1);
    color: var(--primary-color);
    text-decoration: none;
}

.tool-item i {
    color: var(--primary-color);
    margin-right: 0.75rem;
    font-size: 1.3rem;
    width: 24px;
    text-align: center;
}

.main-footer {
    background-color: var(--secondary-color);
    color: #e3f2fd;
    padding: 4rem 0 2rem;
    margin-top: 5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section-title {
    color: white;
    font-weight: 700;
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    position: relative;
}

.footer-section-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 40px;
    height: 3px;
    background-color: var(--accent-color);
    border-radius: 2px;
}

.footer-description {
    color: #90a4ae;
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: #bbdefb;
    text-decoration: none;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
}

.footer-links a:hover {
    color: var(--accent-color);
    transform: translateX(5px);
}

.footer-links a i {
    width: 20px;
    margin-right: 8px;
    font-size: 0.9rem;
}

.social-icons {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.social-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    border-radius: 50%;
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 1.1rem;
}

.social-icon:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(26, 115, 232, 0.3);
    color: white;
    text-decoration: none;
}

.newsletter-form {
    display: flex;
    margin-top: 1rem;
}

.newsletter-form input {
    flex: 1;
    padding: 0.85rem 1rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background-color: rgba(255, 255, 255, 0.05);
    color: white;
    border-radius: 6px 0 0 6px;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.newsletter-form input::placeholder {
    color: #90a4ae;
}

.newsletter-form input:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: rgba(255, 255, 255, 0.08);
}

.newsletter-form button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0 1.5rem;
    border-radius: 0 6px 6px 0;
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-size: 1.1rem;
}

.newsletter-form button:hover {
    background-color: var(--primary-dark);
}

.copyright {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #90a4ae;
    font-size: 0.9rem;
}

.copyright-links a {
    color: #90a4ae;
    text-decoration: none;
    margin-left: 1.5rem;
    transition: color 0.2s ease;
}

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

.toast-notification {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    color: white;
    z-index: 9999;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s ease;
}

.toast-success {
    background-color: var(--success-color);
}

.toast-error {
    background-color: var(--danger-color);
}

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

@media (max-width: 1200px) {
    .tool-cards-container {
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: 2.5rem;
    }

    .featured-tools {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 991.98px) {
    .navbar-collapse {
        margin-top: 1rem;
        background-color: white;
        padding: 1.5rem;
        border-radius: 12px;
        box-shadow: 0 8px 24px rgba(13, 27, 42, 0.1);
        width: 100%;
        overflow-x: visible;
        max-height: calc(100vh - 120px);
        overflow-y: auto;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }

    .navbar-collapse::-webkit-scrollbar {
        display: none;
    }

    .navbar-nav {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav-item {
        margin: 0.25rem 0;
        width: 100%;
    }

    .nav-link {
        width: 100%;
    }

    .dropdown-menu {
        min-width: 100%;
        width: 100%;
        margin-top: 0.25rem;
        margin-left: 0;
        padding-left: 1rem;
        box-shadow: 0 4px 12px rgba(13, 27, 42, 0.08);
    }

    .dropdown-item {
        padding: 0.5rem 1rem;
    }

    .search-form {
        max-width: 100%;
        margin-top: 1rem;
    }

    .tool-cards-container {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .beian-item {
        display: block;
        width: 100%;
        margin: 0.25rem 0;
    }
}

@media (max-width: 767.98px) {
    body {
        padding-top: 70px;
    }

    .hero-section {
        padding: 3rem 2rem;
    }

    .hero-title {
        font-size: 2.2rem;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .copyright {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }

    .copyright-links a {
        margin: 0 0.75rem;
    }

    .toast-notification {
        left: 2rem;
        right: 2rem;
        text-align: center;
    }
}

@media (max-width: 576px) {
    .wide-container {
        padding: 0 1rem;
    }

    .hero-section {
        padding: 2.5rem 1.5rem;
    }

    .hero-title {
        font-size: 1.8rem;
    }

    .tool-card,
    .featured-tool-card,
    .popular-tools-section {
        padding: 1.5rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .newsletter-form {
        flex-direction: column;
        gap: 0.5rem;
    }

    .newsletter-form input,
    .newsletter-form button {
        border-radius: 6px;
        width: 100%;
        padding: 0.85rem 1rem;
    }
}