/**
 * 外贸站前台 - 公共样式（头部、底部、导航、语言切换、按钮、页脚等）
 * 各页面引入此文件后只需保留页面专属样式
 */
:root {
    --ocean-deep: #004d73;
    --ocean-mid: #006699;
    --ocean-light: #0088b7;
    --accent: #ff9933;
    --foam: #e8f4f8;
    --text: #2c3e50;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Microsoft Yahei', 'PingFang SC', sans-serif; color: var(--text); line-height: 1.7; background: #fafbfc; }
a { text-decoration: none; color: var(--ocean-mid); transition: all 0.3s ease; }
a:hover { color: var(--accent); }

/* 导航 */
.navbar { background: rgba(255,255,255,0.98); box-shadow: 0 2px 20px rgba(0,77,115,0.08); position: sticky; top: 0; z-index: 999; }
.navbar-brand { font-size: 1.25rem; font-weight: 700; color: var(--ocean-deep) !important; display: flex; align-items: center; gap: 10px; }
.navbar-brand img { max-height: 42px; max-width: 160px; object-fit: contain; }
.navbar-nav { flex-wrap: nowrap; }
.navbar-nav .nav-item { flex-shrink: 0; }
.nav-link { color: var(--text) !important; font-weight: 500; margin: 0 4px; padding: 8px 10px !important; border-radius: 6px; white-space: nowrap; font-size: 0.95rem; }
.nav-link:hover { color: var(--ocean-light) !important; background: var(--foam); }
@media (min-width: 992px) {
    .navbar-nav .nav-link { font-size: 0.9rem; padding: 6px 8px !important; }
}
.nav-item.language-switch { display: flex; align-items: center; margin-left: 0.5rem; padding-left: 1rem; border-left: 1px solid rgba(0,77,115,0.15); }
.nav-item.language-switch a { padding: 6px 10px; font-size: 0.9rem; color: var(--text) !important; border-radius: 4px; white-space: nowrap; line-height: 1.4; }
.nav-item.language-switch a:hover { color: var(--ocean-light) !important; background: var(--foam); }
.nav-item.language-switch a.active { color: var(--accent) !important; font-weight: 700; }
.nav-item.language-switch a:not(:last-child)::after { content: '|'; margin-left: 10px; color: rgba(0,77,115,0.25); font-weight: 400; pointer-events: none; }

/* 通用区块 */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
section { padding: 4rem 0; }
.section-title { text-align: center; margin-bottom: 2rem; }
.section-title h2 { font-size: 1.75rem; color: var(--ocean-deep); font-weight: 700; position: relative; display: inline-block; }
.section-title h2::after { content: ''; position: absolute; bottom: -8px; left: 50%; transform: translateX(-50%); width: 50px; height: 4px; background: linear-gradient(90deg, var(--ocean-light), var(--accent)); border-radius: 2px; }
.page-banner { background: linear-gradient(135deg, var(--ocean-deep), var(--ocean-mid)); color: #fff; padding: 4rem 0 3rem; text-align: center; }
.page-banner h1 { font-size: 2.25rem; margin: 0; }

/* 按钮 */
.btn-ocean { background: linear-gradient(135deg, var(--accent), #e68a00); color: #fff !important; border: none; padding: 12px 28px; border-radius: 8px; font-weight: 600; box-shadow: 0 4px 15px rgba(255,153,51,0.35); transition: transform 0.2s, box-shadow 0.2s; }
.btn-ocean:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(255,153,51,0.45); }
.text-ocean-deep { color: var(--ocean-deep); }

/* 产品列表卡片：介绍区域限高，超出显示省略号 */
.product-card .card-text {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
    overflow: hidden;
    text-overflow: ellipsis;
    max-height: 5.1em;
    line-height: 1.7;
    margin-bottom: 0.75rem;
}

/* 页脚 */
footer, .footer-ocean { background: linear-gradient(135deg, var(--ocean-deep) 0%, var(--ocean-mid) 100%); color: #fff; padding: 3.5rem 0 1.5rem; }
.footer-logo { font-size: 1.25rem; font-weight: 700; margin-bottom: 0.75rem; color: #fff; }
.footer-links h4, .footer-links .h6 { color: #fff; font-weight: 600; margin-bottom: 1rem; font-size: 1rem; }
.footer-links a, .footer-follow a { color: #fff; opacity: 0.95; }
.footer-links a:hover, .footer-follow a:hover { color: var(--accent); opacity: 1; }
.footer-desc { color: rgba(255,255,255,0.95); font-size: 0.9rem; }
.copyright { text-align: center; padding-top: 2rem; margin-top: 2rem; border-top: 1px solid rgba(255,255,255,0.25); font-size: 0.9rem; color: #fff; }

@media (max-width: 768px) {
    section { padding: 3rem 0; }
    .section-title h2 { font-size: 1.5rem; }
    .nav-item.language-switch { margin-left: 0; padding-left: 0.75rem; margin-top: 0.5rem; padding-top: 0.5rem; border-left: none; border-top: 1px solid rgba(0,77,115,0.12); }
    footer .row { flex-direction: column; gap: 1.5rem; text-align: center; }
    footer .footer-logo { margin-bottom: 0.5rem; }
    footer .footer-links h4, footer .footer-links .h6 { margin-bottom: 0.75rem; font-size: 1rem; }
    footer .footer-links ul { padding-left: 0; list-style: none; }
    footer .footer-links li { margin-bottom: 0.5rem; }
    footer .footer-links a, footer .footer-follow a { display: inline-block; padding: 4px 0; min-height: 2rem; line-height: 2rem; }
    footer .footer-desc { font-size: 0.9rem; margin-bottom: 0; }
    .copyright { padding-top: 1.5rem; margin-top: 1.5rem; font-size: 0.85rem; }
}