/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #007AFF;
    --secondary-color: #5856D6;
    --text-dark: #1D1D1F;
    --text-light: #6E6E73;
    --bg-light: #F5F5F7;
    --white: #FFFFFF;
    --border-color: #D2D2D7;
    --success-color: #34C759;
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
}

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

/* Header Styles */
header {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
}

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

/* Language Switcher */
.language-switcher {
    display: flex;
    align-items: center;
    gap: 10px;
}

.lang-btn {
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--white);
    color: var(--text-dark);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
    cursor: pointer;
}

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

.lang-btn.active {
    background: var(--gradient);
    color: var(--white);
    border-color: transparent;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 100px 20px;
    background: var(--gradient);
    color: var(--white);
}

.hero h1 {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.1;
}

.hero p {
    font-size: 24px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    padding: 16px 40px;
    background: var(--white);
    color: var(--primary-color);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 18px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

/* Features Section */
.features {
    padding: 80px 20px;
    background: var(--bg-light);
}

.features h2 {
    text-align: center;
    font-size: 42px;
    margin-bottom: 60px;
    color: var(--text-dark);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature-card {
    background: var(--white);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-light);
    font-size: 16px;
}

/* Content Page Styles */
.content-page {
    padding: 60px 20px;
    max-width: 900px;
    margin: 0 auto;
}

.content-page h1 {
    font-size: 48px;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.content-page .last-updated {
    color: var(--text-light);
    margin-bottom: 40px;
    font-style: italic;
}

.content-page h2 {
    font-size: 32px;
    margin-top: 40px;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.content-page h3 {
    font-size: 24px;
    margin-top: 30px;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.content-page p {
    margin-bottom: 20px;
    color: var(--text-dark);
    line-height: 1.8;
}

.content-page ul, .content-page ol {
    margin-left: 30px;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.content-page li {
    margin-bottom: 10px;
    line-height: 1.8;
}

.contact-box {
    background: var(--bg-light);
    padding: 30px;
    border-radius: 15px;
    margin: 40px 0;
}

.contact-box h3 {
    margin-top: 0;
}

.contact-box a {
    color: var(--primary-color);
    text-decoration: none;
}

.contact-box a:hover {
    text-decoration: underline;
}

/* FAQ Section */
.faq-item {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 20px;
}

.faq-item h3 {
    margin-top: 0;
    color: var(--primary-color);
}

/* Contact Form */
.contact-form {
    background: var(--white);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    margin-top: 40px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    font-family: inherit;
    transition: border-color 0.3s;
}

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

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

.submit-button {
    background: var(--gradient);
    color: var(--white);
    padding: 14px 40px;
    border: none;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
}

.submit-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

/* Footer */
footer {
    background: var(--text-dark);
    color: var(--white);
    padding: 60px 20px 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    margin-bottom: 20px;
    font-size: 20px;
}

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

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

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: var(--white);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 36px;
    }

    .hero p {
        font-size: 18px;
    }

    nav {
        flex-direction: column;
        gap: 15px;
    }

    .nav-links {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }

    .language-switcher {
        order: -1;
    }

    .features h2 {
        font-size: 32px;
    }

    .content-page h1 {
        font-size: 36px;
    }

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

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-40 {
    margin-top: 40px;
}

.mb-40 {
    margin-bottom: 40px;
}