:root {
    --primary-color: #0F3D3E; /* 深墨绿 */
    --primary-light: #185050;
    --accent-color: #42b983; /* 提亮色 */
    --text-primary: #1A1A1A;
    --text-secondary: #555555;
    --text-light: #F0F5F4;
    --bg-page: #F9FAFA;
    --bg-card: #FFFFFF;
    --border-color: #E0E5E5;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'PingFang SC', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-page);
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.site-header {
    background-color: rgba(15, 61, 62, 0.95);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 16px 0;
    box-shadow: 0 4px 20px rgba(15, 61, 62, 0.1);
}

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

.logo {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-light);
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
    font-size: 15px;
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, #092526 100%);
    color: var(--text-light);
    padding: 120px 0 160px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -50px;
    left: 0;
    width: 100%;
    height: 100px;
    background: var(--bg-page);
    transform: skewY(-2deg);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 24px;
    letter-spacing: -1px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 22px;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 48px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.btn-group {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.btn {
    padding: 14px 40px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-primary {
    background-color: var(--accent-color);
    color: #fff;
    box-shadow: 0 10px 25px rgba(66, 185, 131, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    background-color: #3aa876;
    box-shadow: 0 15px 30px rgba(66, 185, 131, 0.4);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: #fff;
}

.btn-outline:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: #fff;
}

/* Features Section */
.features {
    padding: 100px 0;
    position: relative;
}

.section-title {
    text-align: center;
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 60px;
}

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

.feature-card {
    background: var(--bg-card);
    padding: 40px 30px;
    border-radius: 16px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(15, 61, 62, 0.08);
    border-color: transparent;
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 24px;
    display: inline-block;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
}

/* Screenshots / Visuals Section (Optional) */
.preview-section {
    padding: 80px 0;
    background-color: #fff;
}

/* Download/CTA Section */
.cta-section {
    background-color: var(--primary-color);
    padding: 100px 0;
    text-align: center;
    color: #fff;
}

.cta-section h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.cta-section p {
    font-size: 18px;
    opacity: 0.8;
    margin-bottom: 40px;
}

/* Footer */
.site-footer {
    background-color: #092526;
    color: rgba(255, 255, 255, 0.6);
    padding: 60px 0 30px;
    font-size: 14px;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

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

.copyright {
    margin-top: 20px;
    opacity: 0.5;
}

.icp-record {
    margin-top: 10px;
    font-size: 13px;
    opacity: 0.6;
}

.icp-record a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
}

.icp-record a:hover {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: underline;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 36px;
    }
    .hero-subtitle {
        font-size: 18px;
    }
    .btn-group {
        flex-direction: column;
    }
    .nav-links {
        display: none; /* Simplification for mobile */
    }
}