/* 顶部导航栏样式 */
header {
    background-color: var(--x-color-bg-card);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
    height: 64px;
}

.nav-brand {
    font-size: 20px;
    font-weight: 700;
    color: var(--x-color-primary);
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 32px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--x-color-text-muted);
    font-weight: 500;
    transition: var(--x-transition-base);
}

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

/* 首屏区域展示 */
.hero-section {
    padding: 120px 0;
    text-align: center;
}

.hero-title {
    font-size: 48px;
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--x-color-text-muted);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* 技能卡片网格布局 */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 48px;
    padding-bottom: 80px;
}

.skill-card {
    background-color: var(--x-color-bg-card);
    padding: 32px;
    border-radius: var(--x-radius-base);
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
    transition: var(--x-transition-base);
}

.skill-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
}

/* 业务区块通用间距 */
.section-spacing {
    padding-top: 100px;
}

/* 业务区块标题栏 */
.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-header h2 {
    font-size: 32px;
    color: var(--x-color-text-main);
}

/* 项目矩阵网格布局 */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 32px;
}

/* 项目卡片容器（引入边框与悬浮景深效果） */
.project-card {
    background-color: var(--x-color-bg-card);
    border: 1px solid #e5e7eb;
    border-radius: var(--x-radius-base);
    overflow: hidden;
    transition: var(--x-transition-base);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px -8px rgba(0,0,0,0.12);
    border-color: rgba(37, 99, 235, 0.3);
}

/* 项目内容区布局 */
.project-content {
    padding: 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.project-desc {
    color: var(--x-color-text-muted);
    font-size: 14px;
    margin-bottom: 24px;
    flex: 1;
}

/* 项目标签组容器 */
.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
}

/* 源码/演示链接容器 */
.project-links {
    display: flex;
    gap: 16px;
    border-top: 1px solid #f3f4f6;
    padding-top: 16px;
}

.project-links a {
    font-size: 14px;
    color: var(--x-color-text-main);
    text-decoration: none;
    font-weight: 500;
    transition: var(--x-transition-base);
}

.project-links a:hover {
    color: var(--x-color-primary);
}