:root {
    --primary-color: #6BB3D9;
    --primary-dark: #3498DB;
    --primary-light: #AED6F1;
    --bg-color: #E8F4FC;
    --bg-gradient: linear-gradient(135deg, #E8F4FC 0%, #F0F8FF 100%);
    --surface-color: #FFFFFF;
    --text-color: #2C3E50;
    --text-muted: #7F8C8D;
    --text-light: #95A5A6;
    --border-color: #D6EAF8;
    --hover-bg: #F4F9FC;
    --shadow-sm: 0 2px 8px rgba(107, 179, 217, 0.1);
    --shadow-md: 0 4px 16px rgba(107, 179, 217, 0.15);
    --shadow-lg: 0 8px 24px rgba(107, 179, 217, 0.2);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

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

body {
    font-family: "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow-x: hidden;
    transition: background var(--transition-normal);
}

.download-container {
    width: 100%;
    max-width: 820px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    padding: 60px 50px;
    box-shadow: 0 20px 60px rgba(107, 179, 217, 0.15), 0 2px 8px rgba(0, 0, 0, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.4);
    animation: fadeUp 0.8s ease;
}

.main-title {
    text-align: center;
    font-size: 2.8rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 18px;
    font-weight: 700;
}

.desc {
    text-align: center;
    color: var(--text-muted);
    line-height: 1.9;
    margin-bottom: 45px;
    font-size: 1rem;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.download-card {
    text-decoration: none;
    background: linear-gradient(135deg, var(--hover-bg), #ffffff);
    border-radius: var(--radius-lg);
    padding: 32px 20px;
    text-align: center;
    transition: all var(--transition-normal);
    color: var(--primary-dark);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 12px rgba(107, 179, 217, 0.08);
}

.download-card:hover {
    transform: translateY(-8px);
    background: linear-gradient(135deg, var(--primary-light), #ffffff);
    box-shadow: 0 16px 32px rgba(107, 179, 217, 0.2);
}

.download-icon {
    font-size: 3rem;
    margin-bottom: 18px;
    transition: transform var(--transition-normal);
}

.download-card:hover .download-icon {
    transform: scale(1.1);
}

.download-name {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-color);
}

.download-desc {
    font-size: 0.92rem;
    color: var(--text-muted);
    line-height: 1.7;
}

.back-home {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    margin-top: 45px;
    width: 100%;
    padding: 15px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-normal);
    box-shadow: 0 6px 20px rgba(107, 179, 217, 0.3);
}

.back-home:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(107, 179, 217, 0.4);
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(35px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .download-container {
        padding: 42px 22px;
        border-radius: var(--radius-lg);
    }

    .main-title {
        font-size: 2rem;
    }

    .download-grid {
        grid-template-columns: 1fr;
    }

    .download-card:hover {
        transform: scale(1.02);
    }
}

body.dark-mode {
    --bg-color: #0f172a;
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    --surface-color: #1e293b;
    --text-color: #f1f5f9;
    --text-muted: #94a3b8;
    --text-light: #64748b;
    --border-color: #334155;
    --hover-bg: #334155;
}

body.dark-mode .download-container {
    background: rgba(30, 41, 59, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 10px 35px rgba(0, 0, 0, 0.4);
}

body.dark-mode .main-title {
    color: var(--primary-light);
}

body.dark-mode .desc {
    color: var(--text-light);
}

body.dark-mode .download-card {
    background: linear-gradient(135deg, var(--hover-bg), var(--surface-color));
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

body.dark-mode .download-card:hover {
    background: linear-gradient(135deg, var(--border-color), var(--surface-color));
}

body.dark-mode .download-desc {
    color: var(--text-light);
}

body.dark-mode .download-name {
    color: var(--text-color);
}

body.dark-mode .back-home {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}