/* 容器 */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== Header ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    background: linear-gradient(rgb(233, 233, 239), rgb(251, 232, 206));
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo img {
    height: 40px;
}

/* 导航 */
.main-nav ul {
    display: flex;
    gap: 32px;
}

.main-nav a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    position: relative;
    padding: 4px 0;
}

.main-nav a::after {
    content: "";
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: var(--transition);
}

.main-nav a:hover::after,
.main-nav a.active::after {
    width: 100%;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--color-primary);
}

/* 汉堡菜单按钮（移动端） */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    padding: 4px;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* ===== Footer ===== */
.site-footer {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    font-size: 1rem;
    margin-bottom: 16px;
    color: var(--text-light);
}

.footer-col p,
.footer-col a {
    font-size: 0.875rem;
    color: #94a3b8;
    line-height: 2;
}

.footer-col a:hover {
    color: var(--color-secondary);
}

.footer-bottom {
    border-top: 1px solid #1e293b;
    padding-top: 24px;
    text-align: center;
    font-size: 0.8rem;
    color: #64748b;
}

/* ===== 通用 Section ===== */
.section {
    padding: var(--section-padding);
}

.section-alt {
    background: var(--bg-light);
}

.section-title {
    text-align: center;
    margin-bottom: 48px;
}

.section-title h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.section-title p {
    color: var(--text-secondary);
    font-size: 1.05rem;
}