:root {
    --bg-color: #0f172a;
    --text-color: #e2e8f0;
    --accent-color: #38bdf8;
    --secondary-bg: #1e293b;
    --card-bg: #1e293b;
    --card-hover: #334155;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-cn: 'Noto Sans SC', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

body.lang-zh {
    font-family: var(--font-cn), var(--font-main);
}

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

/* Header */
.header {
    background-color: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-color);
    letter-spacing: -0.5px;
}

.nav {
    display: flex;
    gap: 20px;
    align-items: center;
}

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--accent-color);
}

.lang-btn {
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 5px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.3s ease;
}

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

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: 70px;
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 800px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    background: linear-gradient(to right, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #94a3b8;
    margin-bottom: 40px;
    max-width: 600px;
}

.cta-btn {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--bg-color);
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(56, 189, 248, 0.2);
}

.hero-bg {
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(56, 189, 248, 0.1) 0%, transparent 70%);
    z-index: 1;
}

/* Sections */
.section {
    padding: 100px 0;
}

.section-title {
    font-size: 2rem;
    margin-bottom: 50px;
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background-color: var(--accent-color);
    margin: 15px auto 0;
    border-radius: 2px;
}

/* Apps Grid */
.apps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.app-card {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.app-card:hover {
    transform: translateY(-5px);
    background-color: var(--card-hover);
}

.app-card.coming-soon {
    opacity: 0.7;
    border-style: dashed;
}

.app-card.coming-soon:hover {
    transform: none;
    background-color: var(--card-bg);
    cursor: default;
}

.app-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.app-name {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--text-color);
}

.app-desc {
    color: #94a3b8;
    font-size: 0.95rem;
}

/* Privacy & Contact */
.privacy-section, .contact-section {
    background-color: var(--secondary-bg);
}

.privacy-content, .contact-info {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    color: #cbd5e1;
}

.email-link {
    display: inline-block;
    margin-top: 15px;
    font-size: 1.5rem;
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
}

.email-link:hover {
    text-decoration: underline;
}

/* Footer */
.footer {
    padding: 40px 0;
    text-align: center;
    color: #64748b;
    font-size: 0.9rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .nav {
        gap: 15px;
    }
    
    .nav-link {
        font-size: 0.85rem;
    }
    
    .logo {
        font-size: 1.2rem;
    }
}