:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --secondary-color: #2c3e50;
    --background-color: #f8f9fa;
    --text-color: #343a40;
    --text-light: #6c757d;
    --white: #ffffff;
    --gray: #e9ecef;
    --light-gray: #ced4da;
    --border-color: #dee2e6;
    --hero-gradient: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    --shadow-light: 0 2px 10px rgba(0,0,0,0.05);
    --shadow-medium: 0 5px 20px rgba(0,0,0,0.08);
    --shadow-heavy: 0 10px 30px rgba(0,0,0,0.12);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    font-size: 16px;
}

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

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    background: var(--white);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo img {
    height: 40px;
    width: auto;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary-color);
}

nav {
    display: flex;
    gap: 30px;
    align-items: center;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    position: relative;
}

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

nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

nav a:hover::after {
    width: 100%;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 100px 20px;
    background: var(--hero-gradient);
    border-radius: 16px;
    margin: 40px 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(52, 152, 219, 0.05) 0%, rgba(44, 62, 80, 0.05) 100%);
    pointer-events: none;
}

.hero h2 {
    font-size: 3.2rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 20px;
    line-height: 1.2;
    position: relative;
    z-index: 1;
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 40px;
    color: var(--text-light);
    position: relative;
    z-index: 1;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 30px;
    position: relative;
    z-index: 1;
}

.version-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    position: relative;
    z-index: 1;
}

.version-badge {
    background: var(--primary-color);
    color: var(--white);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.update-info {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--white);
    box-shadow: var(--shadow-medium);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-heavy);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
}

/* Features Section */
.features {
    padding: 100px 0;
    text-align: center;
}

.features h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 60px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    text-align: left;
}

.feature-item {
    background: var(--white);
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-color);
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-heavy);
}

.feature-item:hover::before {
    transform: scaleY(1);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--white);
}

.feature-item h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: 15px;
}

.feature-item p {
    color: var(--text-light);
    margin-bottom: 20px;
    line-height: 1.6;
}

.feature-details {
    list-style: none;
    padding: 0;
}

.feature-details li {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 8px;
    position: relative;
    padding-left: 20px;
}

.feature-details li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 600;
}

/* Showcase Section */
.showcase {
    padding: 80px 0;
    text-align: center;
}

.showcase h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.showcase p {
    color: var(--text-light);
    font-size: 1.1rem;
    margin-bottom: 40px;
}

.showcase-container {
    max-width: 800px;
    margin: 0 auto;
}

.showcase-placeholder {
    padding: 60px 20px;
    text-align: center;
    border: 2px dashed var(--border-color);
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--white);
    position: relative;
}

.showcase-placeholder:hover {
    border-color: var(--primary-color);
    background: #f8f9ff;
}

.showcase-hint {
    color: var(--text-light);
    font-weight: 500;
    font-size: 1.1rem;
    transition: opacity 0.3s ease;
}

.showcase-image {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: var(--shadow-heavy);
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    transition: all 0.5s ease;
    margin-top: 20px;
}

.showcase-placeholder:hover .showcase-image {
    opacity: 1;
    max-height: 600px;
}

/* Download Section */
.download {
    background: var(--white);
    padding: 20px;
    text-align: center;
    border-radius: 16px;
    margin: 40px 0;
    box-shadow: var(--shadow-light);
}

.download h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.download p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 50px;
}

.download-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 50px;
    text-align: left;
}

.download-item {
    background: var(--background-color);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.download-item h4 {
    color: var(--secondary-color);
    font-weight: 600;
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.download-item ul {
    list-style: none;
    padding: 0;
}

.download-item li {
    color: var(--text-light);
    margin-bottom: 8px;
    font-size: 0.95rem;
    position: relative;
    padding-left: 20px;
}

.download-item li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 600;
}

.download-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.download-buttons .btn {
    min-width: 200px;
}

/* Footer */
footer {
    background: var(--secondary-color);
    color: var(--white);
    padding: 20px;
    margin-top: 80px;
    border-radius: 16px;
    margin-bottom: 20px;
}

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

.footer-section h4 {
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--white);
}

.footer-section p {
    color: #bdc3c7;
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

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

.footer-section a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    border-top: 1px solid #34495e;
    padding-top: 20px;
    text-align: center;
    color: #95a5a6;
    font-size: 0.9rem;
}

.footer-bottom p {
    margin-bottom: 5px;
}

/* Responsive Design */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 20px;
        padding: 15px 0;
    }
    
    nav {
        gap: 20px;
    }
    
    .hero h2 {
        font-size: 2.2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .features h2,
    .showcase h2,
    .download h2 {
        font-size: 2rem;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .feature-item {
        padding: 30px;
    }
    
    .download-info {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .download-buttons .btn {
        min-width: 250px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 60px 15px;
    }
    
    .hero h2 {
        font-size: 1.8rem;
    }
    
    .features,
    .download {
        padding: 20px;
    }
    
    .feature-item {
        padding: 25px;
    }
}

/* 详细介绍页面美化 */
.detail-section {
    margin-bottom: 48px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--gray);
}
.detail-section:last-child {
    border-bottom: none;
}
.detail-section h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 18px;
    font-weight: 700;
}

/* 步骤流程美化 */
.steps-list {
    counter-reset: step;
    list-style: none;
    padding-left: 0;
    margin-bottom: 0;
}
.steps-list li {
    display: flex;
    align-items: flex-start;
    margin-bottom: 18px;
    background: var(--background-color);
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(52,152,219,0.06);
    padding: 18px 20px 18px 56px;
    position: relative;
    min-height: 48px;
    font-size: 1.08rem;
}
.steps-list li:last-child {
    margin-bottom: 0;
}
.steps-list li::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    background: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    box-shadow: 0 2px 8px rgba(52,152,219,0.10);
}

/* 卡片分组样式 */
.card-list {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    margin-bottom: 0;
    padding-left: 0;
    list-style: none;
}
.card-list li {
    background: var(--white);
    border: 1px solid var(--gray);
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(44,62,80,0.04);
    padding: 16px 22px;
    min-width: 180px;
    margin-bottom: 0;
    font-size: 1.02rem;
    flex: 1 1 220px;
}

/* FAQ分组 */
.faq-list {
    list-style: none;
    padding-left: 0;
}
.faq-list li {
    margin-bottom: 18px;
    background: #f6fafd;
    border-left: 4px solid var(--primary-color);
    border-radius: 6px;
    padding: 14px 18px;
    font-size: 1.02rem;
}
.faq-list li:last-child {
    margin-bottom: 0;
}

@media (max-width: 600px) {
    .card-list {
        flex-direction: column;
        gap: 10px;
    }
    .card-list li {
        min-width: 0;
        padding: 14px 12px;
    }
    .steps-list li {
        padding: 16px 12px 16px 48px;
        font-size: 1rem;
    }
    .steps-list li::before {
        left: 8px;
        width: 26px;
        height: 26px;
        font-size: 1rem;
    }
}