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

body {
    font-family: "Microsoft YaHei", "微软雅黑", Arial, sans-serif;
    background: linear-gradient(180deg, #1e5ba8 0%, #2d7dd2 50%, #f5f7fa 50%, #f5f7fa 100%);
    color: #333;
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: transparent;
    color: white;
    padding: 30px 0 20px 0;
}

.logo-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.logo {
    width: 100px;
    height: 100px;
    object-fit: contain;
    filter: drop-shadow(0 4px 12px rgba(0,0,0,0.2));
}

.title-group {
    text-align: center;
}

.title-group h1 {
    font-size: 32px;
    font-weight: bold;
    margin-bottom: 8px;
    text-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.subtitle {
    font-size: 14px;
    opacity: 0.95;
    letter-spacing: 0.5px;
}

/* Navigation - Hidden for app download page */
.nav-bar {
    display: none;
}

/* Main Content */
.main-content {
    padding: 40px 0 60px 0;
}

.breadcrumb {
    display: none;
}

.page-title {
    display: none;
}

/* App Card */
.app-card {
    background: white;
    border-radius: 20px;
    padding: 0;
    box-shadow: 0 8px 32px rgba(0,0,0,0.12);
    overflow: hidden;
}

.app-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 50px 40px 40px 40px;
    background: linear-gradient(180deg, #f8f9fc 0%, #ffffff 100%);
    text-align: center;
}

.app-icon {
    margin-bottom: 25px;
}

.app-icon img {
    width: 140px;
    height: 140px;
    border-radius: 28px;
    box-shadow: 0 8px 24px rgba(30, 91, 168, 0.25);
}

.app-details h3 {
    font-size: 28px;
    color: #1a1a1a;
    margin-bottom: 20px;
    font-weight: 600;
}

.app-meta {
    display: flex;
    gap: 30px;
    justify-content: center;
    flex-wrap: wrap;
}

.app-meta-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.app-meta-item .label {
    font-size: 12px;
    color: #999;
    margin-bottom: 5px;
}

.app-meta-item .value {
    font-size: 15px;
    color: #333;
    font-weight: 500;
}

/* App Description */
.app-description {
    padding: 40px;
}

.app-description h4 {
    font-size: 20px;
    color: #1a1a1a;
    margin: 0 0 20px 0;
    font-weight: 600;
}

.app-description p {
    color: #666;
    line-height: 1.9;
    margin-bottom: 30px;
    font-size: 15px;
}

.feature-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-top: 20px;
}

.feature-list li {
    padding: 16px 20px;
    background: linear-gradient(135deg, #f0f7ff 0%, #e6f2ff 100%);
    border-radius: 10px;
    color: #1e5ba8;
    font-size: 15px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-list li:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(30, 91, 168, 0.15);
}

.feature-list li:before {
    content: "✓";
    display: inline-block;
    width: 20px;
    height: 20px;
    background: #1e5ba8;
    color: white;
    border-radius: 50%;
    text-align: center;
    line-height: 20px;
    font-size: 12px;
    flex-shrink: 0;
}

/* Download Buttons */
.download-buttons {
    display: flex;
    justify-content: center;
    padding: 0 40px 40px 40px;
}

.btn-download {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 18px 60px;
    font-size: 18px;
    font-weight: 600;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 6px 20px rgba(30, 91, 168, 0.3);
    width: 100%;
    max-width: 400px;
}

.btn-download.android {
    background: linear-gradient(135deg, #1e5ba8 0%, #2d7dd2 100%);
    color: white;
}

.btn-download.android:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 28px rgba(30, 91, 168, 0.4);
}

.btn-download.android:active {
    transform: translateY(-1px);
}

.btn-download .icon {
    width: 26px;
    height: 26px;
}

.qr-code {
    text-align: center;
}

.qr-code img {
    width: 150px;
    height: 150px;
    border: 3px solid #ddd;
    border-radius: 8px;
    padding: 10px;
    background: white;
}

.qr-code p {
    margin-top: 10px;
    color: #666;
    font-size: 14px;
}

/* System Requirements & Notice */
.system-requirements,
.notice {
    margin: 0 40px 30px 40px;
    padding: 25px;
    background: #fef9f0;
    border-radius: 12px;
    border: 1px solid #ffe8c5;
}

.system-requirements h4,
.notice h4 {
    font-size: 16px;
    color: #1a1a1a;
    margin-bottom: 15px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.system-requirements h4:before {
    content: "📱";
    font-size: 18px;
}

.notice h4:before {
    content: "💡";
    font-size: 18px;
}

.system-requirements p {
    color: #666;
    font-size: 14px;
}

.notice ul {
    list-style: none;
    color: #666;
}

.notice ul li {
    padding: 10px 0;
    padding-left: 24px;
    position: relative;
    font-size: 14px;
    line-height: 1.6;
}

.notice ul li:before {
    content: "•";
    position: absolute;
    left: 8px;
    color: #ff9800;
    font-weight: bold;
    font-size: 16px;
}

/* Footer */
.footer {
    background-color: #1a1a1a;
    color: #999;
    padding: 40px 0;
    margin-top: 80px;
}

.footer-content {
    text-align: center;
}

.footer-content p {
    margin: 10px 0;
    font-size: 13px;
    line-height: 1.8;
}

/* Responsive */
@media (max-width: 768px) {
    body {
        background: linear-gradient(180deg, #1e5ba8 0%, #2d7dd2 40%, #f5f7fa 40%, #f5f7fa 100%);
    }
    
    .header {
        padding: 20px 0 15px 0;
    }
    
    .logo {
        width: 80px;
        height: 80px;
    }
    
    .title-group h1 {
        font-size: 24px;
    }
    
    .subtitle {
        font-size: 12px;
    }
    
    .main-content {
        padding: 30px 0 40px 0;
    }
    
    .app-card {
        border-radius: 16px;
    }
    
    .app-info {
        padding: 40px 20px 30px 20px;
    }
    
    .app-icon img {
        width: 110px;
        height: 110px;
        border-radius: 22px;
    }
    
    .app-details h3 {
        font-size: 24px;
    }
    
    .app-meta {
        gap: 20px;
    }
    
    .app-description {
        padding: 30px 20px;
    }
    
    .app-description h4 {
        font-size: 18px;
    }
    
    .feature-list {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .download-buttons {
        padding: 0 20px 30px 20px;
    }
    
    .btn-download {
        padding: 16px 40px;
        font-size: 16px;
    }
    
    .system-requirements,
    .notice {
        margin: 0 20px 20px 20px;
        padding: 20px;
    }
    
    .footer {
        margin-top: 50px;
        padding: 30px 0;
    }
}