/* 响应式布局样式 */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --success-color: #27ae60;
    --bg-color: #f5f5f5;
    --card-bg: #ffffff;
    --text-color: #333;
    --border-color: #e0e0e0;
}

/* UI 风格变体 */
.ui-style-0 { --primary-color: #1a237e; --secondary-color: #3f51b5; }
.ui-style-1 { --primary-color: #004d40; --secondary-color: #009688; }
.ui-style-2 { --primary-color: #bf360c; --secondary-color: #ff5722; }
.ui-style-3 { --primary-color: #311b92; --secondary-color: #673ab7; }
.ui-style-4 { --primary-color: #1b5e20; --secondary-color: #4caf50; }
.ui-style-5 { --primary-color: #b71c1c; --secondary-color: #f44336; }
.ui-style-6 { --primary-color: #006064; --secondary-color: #00bcd4; }
.ui-style-7 { --primary-color: #e65100; --secondary-color: #ff9800; }
.ui-style-8 { --primary-color: #4a148c; --secondary-color: #9c27b0; }
.ui-style-9 { --primary-color: #33691e; --secondary-color: #8bc34a; }
.ui-style-10 { --primary-color: #880e4f; --secondary-color: #e91e63; }
.ui-style-11 { --primary-color: #01579b; --secondary-color: #03a9f4; }
.ui-style-12 { --primary-color: #263238; --secondary-color: #607d8b; }
.ui-style-13 { --primary-color: #3e2723; --secondary-color: #795548; }
.ui-style-14 { --primary-color: #1a237e; --secondary-color: #5c6bc0; }
.ui-style-15 { --primary-color: #827717; --secondary-color: #cddc39; }

/* 布局变体 */
.layout-A .card-grid { gap: 15px; }
.layout-B .card-grid { gap: 25px; }
.layout-C .card { border-radius: 12px; }
.layout-D .card { border-radius: 4px; }
.layout-E .section { box-shadow: 0 4px 8px rgba(0,0,0,0.15); }
.layout-F .container { max-width: 1400px; }
.layout-G .card:hover { transform: scale(1.02); }

/* 导航栏增强 */
nav {
    background: var(--primary-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

nav a {
    transition: all 0.3s ease;
    font-size: 0.95em;
}

nav a:hover {
    background: rgba(255,255,255,0.1);
}

nav a.logo {
    font-size: 1.3em;
    letter-spacing: 1px;
}

/* 卡片样式增强 */
.card {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-left: 4px solid var(--secondary-color);
}

.card:hover {
    border-left-color: var(--accent-color);
}

.card h3 {
    color: var(--primary-color);
    font-size: 1.15em;
    line-height: 1.4;
}

.card .meta {
    color: #777;
    font-size: 0.88em;
    padding: 3px 0;
}

.card .desc {
    color: #555;
    font-size: 0.95em;
    line-height: 1.6;
    margin: 12px 0;
}

.card a {
    color: var(--secondary-color);
    display: inline-block;
    margin-top: 8px;
    font-weight: 600;
    transition: color 0.3s;
}

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

/* 段落样式 */
.intro p, .section p {
    line-height: 1.8;
    margin-bottom: 12px;
}

/* 响应式调整 */
@media (max-width: 1024px) {
    .card-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: 15px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    h1 {
        font-size: 1.5em;
    }

    h2 {
        font-size: 1.2em;
    }

    .card-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    nav .nav-container {
        flex-wrap: nowrap;
        overflow-x: hidden;
    }

    nav a {
        padding: 12px 6px;
        font-size: 0.8em;
        min-width: 0;
    }

    nav a.logo {
        padding: 12px 10px;
        font-size: 0.95em;
    }
}

@media (max-width: 480px) {
    nav a {
        padding: 10px 4px;
        font-size: 0.75em;
    }

    nav a.logo {
        padding: 10px 8px;
        font-size: 0.9em;
    }

    .card {
        padding: 12px;
    }

    .section {
        padding: 15px;
    }
}

/* 链接样式 */
a {
    transition: all 0.3s ease;
}

.section a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 500;
}

.section a:hover {
    text-decoration: underline;
    color: var(--accent-color);
}

/* 标题样式 */
h1, h2 {
    font-weight: 600;
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}