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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #fff;
    --bg-light: #f8f9fa;
    --border-color: #e1e4e8;
    --max-width: 1200px;
    --content-width: 800px;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.content-container {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: var(--primary-color);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.logo {
    color: #fff;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.logo:hover {
    color: #fff;
}

nav {
    display: flex;
    gap: 25px;
}

nav a {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.95rem;
    font-weight: 500;
}

nav a:hover {
    color: #fff;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: #fff;
    margin: 5px 0;
    transition: transform 0.3s ease;
}

.banner {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    padding: 60px 0;
    color: #fff;
}

.banner-content {
    display: flex;
    align-items: center;
    gap: 50px;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.banner-text {
    flex: 1;
}

.banner-text h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.banner-text p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 25px;
}

.banner-image {
    flex: 0 0 400px;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    background-color: #fff;
    color: var(--primary-color);
    font-weight: 600;
    border-radius: 4px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    color: var(--primary-color);
}

.section {
    padding: 60px 0;
}

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

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
}

.card {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transform: translateY(-3px);
}

.card h3 {
    font-size: 1.2rem;
    margin-bottom: 12px;
    color: var(--primary-color);
}

.card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.card-link {
    display: inline-block;
    margin-top: 15px;
    font-weight: 500;
}

article {
    padding: 50px 0;
}

article h1 {
    font-size: 2.2rem;
    color: var(--primary-color);
    margin-bottom: 15px;
    line-height: 1.3;
}

article h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-top: 40px;
    margin-bottom: 15px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--border-color);
}

article h3 {
    font-size: 1.2rem;
    color: var(--secondary-color);
    margin-top: 30px;
    margin-bottom: 12px;
}

article p {
    margin-bottom: 18px;
}

article ul, article ol {
    margin: 15px 0 20px 25px;
}

article li {
    margin-bottom: 8px;
}

.article-meta {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.article-image {
    margin: 30px 0;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

pre {
    background-color: #f6f8fa;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 20px;
    overflow-x: auto;
    margin: 20px 0;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.9rem;
    line-height: 1.5;
}

code {
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    background-color: #f6f8fa;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.9em;
}

pre code {
    background: none;
    padding: 0;
}

.step-box {
    background-color: var(--bg-light);
    border-left: 4px solid var(--accent-color);
    padding: 20px 25px;
    margin: 20px 0;
}

.step-box h4 {
    color: var(--accent-color);
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.note-box {
    background-color: #fff8e6;
    border-left: 4px solid #f0ad4e;
    padding: 15px 20px;
    margin: 20px 0;
}

.warning-box {
    background-color: #feecec;
    border-left: 4px solid #dc3545;
    padding: 15px 20px;
    margin: 20px 0;
}

footer {
    background-color: var(--primary-color);
    color: rgba(255, 255, 255, 0.8);
    padding: 40px 0 20px;
    margin-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.footer-section h4 {
    color: #fff;
    font-size: 1rem;
    margin-bottom: 15px;
}

.footer-section a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.footer-section a:hover {
    color: #fff;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    margin-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.85rem;
}

.legal-content {
    padding: 50px 0;
}

.legal-content h1 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.legal-content .last-updated {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 30px;
}

.legal-content h2 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-top: 35px;
    margin-bottom: 15px;
}

.legal-content p {
    margin-bottom: 15px;
}

.contact-form {
    max-width: 600px;
    margin: 30px auto;
}

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

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.submit-btn {
    background-color: var(--accent-color);
    color: #fff;
    padding: 14px 35px;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

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

.breadcrumb {
    padding: 15px 0;
    font-size: 0.9rem;
    color: var(--text-light);
}

.breadcrumb a {
    color: var(--text-light);
}

.breadcrumb span {
    margin: 0 8px;
}

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }

    .mobile-menu-toggle {
        display: block;
    }

    nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        height: 100vh;
        background-color: var(--primary-color);
        flex-direction: column;
        padding: 20px;
        gap: 15px;
    }

    nav.active {
        display: flex;
    }

    nav a {
        padding: 10px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .banner {
        padding: 40px 0;
    }

    .banner-content {
        flex-direction: column;
        text-align: center;
        gap: 30px;
    }

    .banner-text h1 {
        font-size: 1.8rem;
    }

    .banner-image {
        flex: 0 0 auto;
        max-width: 300px;
    }

    .section {
        padding: 40px 0;
    }

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

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

    article h1 {
        font-size: 1.7rem;
    }

    article h2 {
        font-size: 1.3rem;
    }

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

    pre {
        padding: 15px;
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .header-inner {
        padding: 0 15px;
    }

    .logo {
        font-size: 1.3rem;
    }

    .banner-text h1 {
        font-size: 1.5rem;
    }

    .banner-text p {
        font-size: 1rem;
    }

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

    .card {
        padding: 20px;
    }
}