/* ============================================
   全局布局 - 导航栏、底部、容器、响应式
   ============================================ */

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

.container--narrow {
    max-width: 900px;
}

/* === 导航栏 === */
.site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-nav);
    background: var(--bg);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal);
}

.site-header--hidden {
    transform: translateY(-100%);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--nav-height);
    padding: 0 var(--space-lg);
}

.nav__logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.nav__logo span {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav__menu {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav__link {
    color: var(--text);
    font-weight: 500;
    font-size: var(--fs-small);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

.nav__link:hover,
.nav__link--active {
    color: var(--primary);
    background: var(--card-bg);
}

.nav__link--active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--primary);
    border-radius: 2px;
}

.nav__search {
    display: flex;
    align-items: center;
    background: var(--card-bg);
    border-radius: 20px;
    padding: var(--space-xs) var(--space-md);
    gap: var(--space-sm);
}

.nav__search input {
    background: transparent;
    width: 120px;
    font-size: var(--fs-small);
}

.nav__search-btn {
    color: var(--primary);
    font-size: 1.1rem;
}

.nav__mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-sm);
}

.nav__mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition-fast);
}

/* === 热搜滚动条 === */
.trending-ticker {
    background: var(--gradient-primary);
    color: #FFFFFF;
    height: var(--ticker-height);
    display: flex;
    align-items: center;
    overflow: hidden;
    z-index: var(--z-ticker);
}

.trending-ticker__label {
    background: var(--accent);
    padding: 0 var(--space-md);
    height: 100%;
    display: flex;
    align-items: center;
    font-weight: 700;
    font-size: var(--fs-small);
    white-space: nowrap;
    flex-shrink: 0;
}

.trending-ticker__track {
    display: flex;
    animation: ticker-scroll 30s linear infinite;
    white-space: nowrap;
}

.trending-ticker__track:hover {
    animation-play-state: paused;
}

.trending-ticker__item {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0 var(--space-lg);
    font-size: var(--fs-small);
    cursor: pointer;
    transition: opacity var(--transition-fast);
}

.trending-ticker__item:hover {
    opacity: 0.8;
}

.trending-ticker__tag {
    font-size: var(--fs-xs);
    padding: 1px 6px;
    border-radius: 3px;
    font-weight: 700;
}

.trending-ticker__tag--hot {
    background: #FF4500;
}

.trending-ticker__tag--new {
    background: #00C853;
}

.trending-ticker__tag--boom {
    background: #FFD700;
    color: #333;
}

@keyframes ticker-scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* === 主内容区 === */
.site-main {
    min-height: calc(100vh - var(--nav-height) - var(--ticker-height));
    padding-top: var(--space-xl);
    padding-bottom: var(--space-3xl);
}

/* === 页脚 === */
.site-footer {
    background: var(--text);
    color: #FFFFFF;
    padding: var(--space-3xl) 0 var(--space-xl);
}

.footer__grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.footer__brand {
    font-size: var(--fs-h3);
    font-weight: 800;
    color: var(--primary);
    margin-bottom: var(--space-md);
}

.footer__desc {
    color: #AAAAAA;
    font-size: var(--fs-small);
    line-height: 1.8;
}

.footer__title {
    font-size: var(--fs-body);
    font-weight: 700;
    margin-bottom: var(--space-md);
    color: #FFFFFF;
}

.footer__links a {
    display: block;
    color: #AAAAAA;
    font-size: var(--fs-small);
    padding: var(--space-xs) 0;
    transition: color var(--transition-fast);
}

.footer__links a:hover {
    color: var(--primary);
}

.footer__bottom {
    border-top: 1px solid #333;
    padding-top: var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer__copyright {
    color: #AAAAAA;
    font-size: var(--fs-xs);
}

.footer__legal {
    display: flex;
    gap: var(--space-lg);
}

.footer__legal a {
    color: #AAAAAA;
    font-size: var(--fs-xs);
}

.footer__legal a:hover {
    color: var(--primary);
}

/* === 面包屑导航 === */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) 0;
    font-size: var(--fs-small);
    color: var(--text-muted);
}

.breadcrumb a {
    color: var(--text-light);
}

.breadcrumb a:hover {
    color: var(--primary);
}

.breadcrumb__separator {
    color: var(--text-muted);
}

/* === 响应式 === */
@media (max-width: 1024px) {
    .footer__grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav__menu {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--bg);
        flex-direction: column;
        padding: var(--space-lg);
        box-shadow: var(--shadow-md);
    }

    .nav__menu--open {
        display: flex;
    }

    .nav__mobile-toggle {
        display: flex;
    }

    .nav__search {
        width: 100%;
    }

    .nav__search input {
        width: 100%;
    }

    .footer__grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .footer__bottom {
        flex-direction: column;
        text-align: center;
    }
}