:root {
    --primary: #1a73e8;
    --primary-dark: #1557b0;
    --primary-light: #e8f0fe;
    --bg: #ffffff;
    --bg-alt: #f8f9fa;
    --bg-dark: #1a1a2e;
    --text: #202124;
    --text-secondary: #5f6368;
    --text-light: #9aa0a6;
    --border: #e0e0e0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
    --radius: 12px;
    --radius-sm: 8px;
    --max-width: 1280px;
    --nav-height: 64px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 16px rgba(26,115,232,0.35); }
.btn-primary:hover { background: var(--primary-dark); transform: scale(1.05); }

nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    height: var(--nav-height);
}
nav .nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}
nav .nav-logo { display: flex; align-items: center; gap: 8px; font-size: 20px; font-weight: 700; }
nav .nav-logo img { height: 36px; }
nav .nav-links { display: flex; align-items: center; gap: 32px; }
nav .nav-links a { font-size: 15px; font-weight: 500; color: var(--text-secondary); transition: color 0.2s; position: relative; }
nav .nav-links a:hover, nav .nav-links a.active { color: var(--primary); }
nav .nav-links a.active::after { content: ''; position: absolute; bottom: -4px; left: 0; right: 0; height: 2px; background: var(--primary); border-radius: 1px; }
nav .mobile-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--text); }

.news-detail { padding: 48px 0 80px; background: var(--bg-alt); }
.breadcrumb { margin-bottom: 24px; }
.breadcrumb a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary);
    font-size: 14px;
    font-weight: 500;
}
.breadcrumb a:hover { color: var(--primary-dark); }

.detail-article {
    background: #fff;
    border-radius: var(--radius);
    padding: 48px;
    box-shadow: var(--shadow-lg);
    border-left: 6px solid var(--primary);
    margin-bottom: 32px;
}
.detail-article .da-header { margin-bottom: 24px; border-bottom: 1px solid var(--border); padding-bottom: 24px; }
.detail-article .da-date { font-size: 13px; color: var(--text-light); margin-bottom: 8px; }
.detail-article .da-header h1 { font-size: 32px; font-weight: 800; line-height: 1.35; margin-bottom: 12px; }
.detail-article .da-source { font-size: 13px; color: var(--primary); font-weight: 500; }

.detail-article .da-body { color: var(--text-secondary); }
.detail-article .da-body p { font-size: 16px; line-height: 1.9; margin-bottom: 18px; }
.detail-article .da-body p strong { color: var(--text); }
.detail-article .da-body h2 { font-size: 22px; font-weight: 700; color: var(--text); margin: 28px 0 12px; }
.detail-article .da-images {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin: 24px 0;
}
.detail-article .da-images figure {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px;
    text-align: center;
}
.detail-article .da-images img {
    max-height: 300px;
    width: auto;
    max-width: 100%;
    margin: 0 auto;
    object-fit: contain;
}
.detail-article .da-images figcaption {
    margin-top: 10px;
    font-size: 12px;
    color: var(--text-light);
    line-height: 1.5;
}
.detail-article .da-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 12px;
    margin: 20px 0;
}
.detail-article .da-highlight {
    background: var(--primary-light);
    color: var(--primary);
    border-radius: var(--radius-sm);
    padding: 14px 8px;
    text-align: center;
    font-weight: 600;
    font-size: 14px;
}
.detail-article .da-tags { display: flex; gap: 8px; margin-top: 24px; flex-wrap: wrap; }
.detail-article .da-tags span {
    background: var(--primary-light);
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 16px;
    font-size: 12px;
    font-weight: 500;
}

.back-link { text-align: center; }
.back-link a {
    display: inline-block;
    padding: 12px 32px;
    border: 1px solid var(--primary);
    color: var(--primary);
    border-radius: 50px;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.3s;
}
.back-link a:hover { background: var(--primary); color: #fff; }

footer {
    background: var(--bg-dark);
    color: #b0b8c1;
    padding: 48px 0 24px;
}
footer .footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 32px;
    margin-bottom: 32px;
}
footer h4 { color: #fff; font-size: 15px; margin-bottom: 12px; }
footer a { font-size: 13px; color: #b0b8c1; display: block; margin-bottom: 6px; transition: color 0.2s; }
footer a:hover { color: #fff; }
footer .footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px;
    text-align: center;
    font-size: 12px;
}

@media (max-width: 768px) {
    .news-detail { padding: 32px 0 48px; }
    .detail-article { padding: 24px; }
    .detail-article .da-header h1 { font-size: 24px; }
    .detail-article .da-images { grid-template-columns: 1fr; }
    nav .nav-links { display: none; }
    nav .mobile-toggle { display: block; }
    nav .nav-links.open { display: flex; flex-direction: column; position: absolute; top: var(--nav-height); left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--border); padding: 16px 24px; gap: 16px; box-shadow: var(--shadow); }
}