/* CSS Variables */
:root {
    --primary-color: #16a34a;
    --primary-dark: #15803d;
    --primary-light: #22c55e;
    --secondary-color: #1a73e8;
    --accent-color: #ea4335;
    --dark-color: #202124;
    --gray-900: #202124;
    --gray-800: #3c4043;
    --gray-700: #5f6368;
    --gray-600: #80868b;
    --gray-500: #9aa0a6;
    --gray-400: #bdc1c6;
    --gray-300: #dadce0;
    --gray-200: #e8eaed;
    --gray-100: #f8f9fa;
    --white: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);
    --shadow-md: 0 1px 3px 0 rgba(60, 64, 67, 0.3), 0 4px 8px 3px rgba(60, 64, 67, 0.15);
    --shadow-lg: 0 1px 3px 0 rgba(60, 64, 67, 0.3), 0 8px 16px 4px rgba(60, 64, 67, 0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

/* Reset & Base */
.regulations-page *,
.regulations-page *::before,
.regulations-page *::after {
    box-sizing: border-box;
}

.regulations-page {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--white);
}

.regulations-page a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.regulations-page a:hover {
    color: var(--primary-dark);
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===================================
   导航栏
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-300);
    z-index: 1000;
    transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

.navbar.scrolled {
    border-bottom-color: transparent;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08), 0 1px 3px rgba(0, 0, 0, 0.06);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 1.2rem;
    color: var(--primary-color);
    text-decoration: none;
}

.logo-badge {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    background: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-badge-text {
    color: white;
    font-weight: bold;
    font-size: 12px;
}

.logo-text {
    color: var(--gray-900);
    font-weight: 600;
}

.nav-menu {
    display: flex;
    gap: 4px;
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-item {
    position: relative;
}

.nav-link {
    padding: 8px 14px;
    border-radius: var(--radius-md);
    color: var(--gray-800);
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link:hover {
    background: var(--gray-100);
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 4px solid currentColor;
    opacity: 0.5;
    transition: var(--transition);
}

.nav-item:hover .nav-link::after {
    transform: rotate(180deg);
}

/* Dropdown */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    padding: 8px 0;
    z-index: 100;
}

.nav-item:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    display: block;
    padding: 10px 16px;
    color: var(--gray-700);
    font-size: 0.9rem;
    transition: var(--transition);
}

.dropdown-menu a:hover {
    background: var(--gray-100);
    color: var(--primary-color);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--gray-800);
    transition: var(--transition);
}

/* ===================================
   面包屑导航
   =================================== */
.breadcrumb {
    padding: 8px 0;
    background: var(--gray-100);
    border-bottom: 1px solid var(--gray-200);
    margin-top: 60px;
    position: sticky;
    top: 60px;
    z-index: 999;
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 0.85rem;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.breadcrumb-item a {
    color: var(--gray-600);
    text-decoration: none;
    transition: var(--transition);
}

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

.breadcrumb-item.active {
    color: var(--gray-800);
    font-weight: 500;
}

.breadcrumb-separator {
    color: var(--gray-400);
}

/* ===================================
   Hero 区域
   =================================== */
.hero {
    padding: 56px 0 48px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 50%, #f0fdf4 100%);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -80px;
    right: -60px;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(22, 163, 74, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -60px;
    left: -40px;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(26, 115, 232, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

.hero-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--gray-700);
    max-width: 700px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

/* ===================================
   法规列表区域
   =================================== */
.regulations-section {
    padding: 48px 0 80px;
    background: var(--gray-100);
}

/* 筛选按钮 */
.regulations-filter {
    display: flex;
    gap: 12px;
    margin-bottom: 32px;
    flex-wrap: wrap;
    justify-content: center;
    position: sticky;
    top: 98px;
    z-index: 50;
    padding: 16px 0;
    background: var(--gray-100);
}

.regulations-filter::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gray-300), transparent);
}

.filter-btn {
    padding: 8px 20px;
    border-radius: 20px;
    border: 1px solid var(--gray-300);
    background: var(--white);
    color: var(--gray-700);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.25s ease;
}

.filter-btn:hover {
    background: var(--gray-200);
    border-color: var(--gray-400);
    transform: translateY(-1px);
}

.filter-btn.active {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
    box-shadow: 0 2px 8px rgba(22, 163, 74, 0.3);
}

/* 法规卡片网格 */
.regulations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 24px;
}

/* Card entrance animation */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.regulation-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.3s ease, transform 0.3s ease, border-color 0.3s ease, opacity 0.35s ease;
    border: 1px solid var(--gray-200);
    display: block;
    text-decoration: none;
    color: inherit;
    opacity: 0;
    animation: fadeInUp 0.5s ease forwards;
}

/* Card staggered animation delays */
.regulation-card:nth-child(1) {
    animation-delay: 0.03s;
}

.regulation-card:nth-child(2) {
    animation-delay: 0.06s;
}

.regulation-card:nth-child(3) {
    animation-delay: 0.09s;
}

.regulation-card:nth-child(4) {
    animation-delay: 0.12s;
}

.regulation-card:nth-child(5) {
    animation-delay: 0.15s;
}

.regulation-card:nth-child(6) {
    animation-delay: 0.18s;
}

.regulation-card:nth-child(7) {
    animation-delay: 0.21s;
}

.regulation-card:nth-child(8) {
    animation-delay: 0.24s;
}

.regulation-card:nth-child(9) {
    animation-delay: 0.27s;
}

/* Filter visibility transition */
.regulation-card.card-hidden {
    opacity: 0;
    transform: scale(0.95);
    position: absolute;
    pointer-events: none;
    width: 0;
    height: 0;
    padding: 0;
    margin: 0;
    border: 0;
    overflow: hidden;
}

.regulation-card.card-visible {
    opacity: 1;
    transform: scale(1);
}

.regulation-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
    border-color: var(--primary-light);
}

.regulation-card .card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.card-region {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--gray-100);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 13px;
    color: var(--gray-700);
}

.card-status {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
}

.card-status.effective {
    background: #dcfce7;
    color: #15803d;
}

.card-status.expected {
    background: #fef3c7;
    color: #b45309;
}

.card-status.stalled {
    background: #fee2e2;
    color: #b91c1c;
}

.card-year {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    background: #e0f2fe;
    color: #0369a1;
}

.regulation-card .card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 12px;
    line-height: 1.4;
}

.regulation-card .card-desc {
    color: var(--gray-700);
    font-size: 14px;
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ===================================
   法规详情页样式
   =================================== */
.article-hero {
    padding: 40px 0 30px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.article-tag {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
}

.article-tag.effective {
    background: #dcfce7;
    color: #15803d;
}

.article-tag.expected {
    background: #fef3c7;
    color: #b45309;
}

.article-date {
    color: var(--gray-600);
    font-size: 14px;
}

.article-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 20px;
    line-height: 1.3;
}

.article-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--gray-600);
    font-size: 14px;
    margin-bottom: 20px;
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    transition: all 0.25s ease;
}

.article-back:hover {
    color: var(--primary-color);
    background: var(--gray-100);
    gap: 12px;
}

/* Reading progress bar */
.reading-progress {
    position: fixed;
    top: 60px;
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    z-index: 1001;
    transition: width 0.1s linear;
}

/* 文章内容 */
.article-content {
    padding: 48px 0 80px;
    background: var(--white);
}

.article-body {
    max-width: 800px;
    margin: 0 auto;
}

.article-body h2 {
    font-size: 24px;
    font-weight: 600;
    color: var(--gray-900);
    margin-top: 40px;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary-color);
}

.article-body h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--gray-900);
    margin-top: 32px;
    margin-bottom: 12px;
}

.article-body p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: 16px;
}

.article-body ul,
.article-body ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

.article-body li {
    font-size: 16px;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: 8px;
}

.article-body strong {
    color: var(--gray-900);
    font-weight: 600;
}

.article-body a {
    color: var(--primary-color);
    text-decoration: underline;
}

/* 官方立法链接 */
.official-links {
    margin-top: 48px;
    padding: 24px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-radius: var(--radius-lg);
    border: 1px solid #bae6fd;
}

.official-links-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.official-links-title::before {
    content: "📋";
}

.official-links-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.official-links-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.official-links-list li::before {
    content: "🔗";
    flex-shrink: 0;
}

.official-links-list a {
    color: var(--secondary-color);
    text-decoration: none;
    font-size: 14px;
    word-break: break-all;
    transition: var(--transition);
}

.official-links-list a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.official-links-list .link-desc {
    color: var(--gray-600);
    font-size: 13px;
    margin-top: 4px;
}

/* 相关法规 */
.related-regulations {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid var(--gray-200);
}

.related-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 24px;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.related-card {
    display: block;
    padding: 16px 20px;
    background: var(--gray-100);
    border-radius: var(--radius-md);
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
}

.related-card:hover {
    background: var(--gray-200);
}

.related-card h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.related-card p {
    font-size: 13px;
    color: var(--gray-600);
    margin: 0;
}

/* ===================================
   页脚
   =================================== */
.footer {
    background: #f5f7f9;
    color: #333333;
    padding: 50px 0 20px;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    max-width: 960px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gray-300), var(--primary-color), var(--gray-300), transparent);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 32px;
}

.footer-brand {
    max-width: 320px;
}

.footer-brand-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    text-decoration: none;
}

.footer-brand .logo-badge {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    background: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
}

.footer-brand .logo-badge-text {
    color: white;
    font-weight: bold;
    font-size: 12px;
}

.footer-brand .logo-text {
    font-size: 1.15rem;
    font-weight: 600;
    color: #222222;
}

.footer-brand>p {
    color: #666666;
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 12px;
}

.footer-brand .brand-note {
    color: #718096;
    font-size: 12px;
}

.footer-brand .brand-note a {
    color: var(--primary-color);
}

.footer-brand .brand-note a:hover {
    text-decoration: underline;
}

.footer-links h4 {
    font-size: 0.95rem;
    margin-bottom: 14px;
    font-weight: 600;
    color: #222222;
}

.footer-links ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links ul li {
    margin-bottom: 8px;
}

.footer-links a {
    color: #333333;
    font-size: 0.85rem;
    transition: var(--transition);
}

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

.footer-bottom {
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
    text-align: center;
    color: #666666;
    font-size: 0.8rem;
}

.footer-disclaimer {
    margin-top: 12px;
    font-size: 0.75rem;
    color: #999999;
    line-height: 1.6;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

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

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 16px;
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-toggle {
        display: flex;
    }

    .dropdown-menu {
        position: static;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        padding-left: 16px;
        display: none;
    }

    .nav-item.active .dropdown-menu {
        display: block;
    }

    .hero {
        padding: 40px 0 32px;
    }

    .hero-title {
        font-size: 28px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .regulations-filter {
        top: 60px;
    }

    .regulations-section {
        padding: 32px 0 60px;
    }

    .regulations-grid {
        grid-template-columns: 1fr;
    }

    .article-title {
        font-size: 24px;
    }

    .article-body h2 {
        font-size: 20px;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .regulation-card {
        padding: 20px;
    }

    .article-content {
        padding: 32px 0 60px;
    }
}