/* ============================================
   Cathay Praxis Law - Shared Styles
   统一设计系统 - 确保所有页面一致性
   ============================================ */

/* CSS Variables - Design Tokens */
:root {
    /* Colors */
    --color-primary: #1e3a5f;
    --color-primary-light: #2d5a87;
    --color-primary-dark: #0f1f33;
    --color-accent: #5b8db8;
    --color-accent-light: #7ba3c7;
    --color-accent-dark: #4a7ba8;
    --color-sky: #e8f4fc;
    --color-sky-light: #f0f8ff;
    --color-sky-dark: #d6e9f5;
    
    /* Text Colors */
    --color-text-primary: #1e3a5f;
    --color-text-secondary: #4a5568;
    --color-text-muted: #718096;
    --color-text-light: #a0aec0;
    
    /* Background Colors */
    --color-bg-white: #ffffff;
    --color-bg-light: #f7fafc;
    --color-bg-sky: #e8f4fc;
    
    /* Border Colors */
    --color-border: #e2e8f0;
    --color-border-light: #edf2f7;
    
    /* Typography */
    --font-serif: 'Cormorant Garamond', Georgia, serif;
    --font-sans: 'Inter', system-ui, sans-serif;
    
    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    --text-7xl: 4.5rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(30, 58, 95, 0.05);
    --shadow-md: 0 4px 6px rgba(30, 58, 95, 0.07);
    --shadow-lg: 0 10px 15px rgba(30, 58, 95, 0.1);
    --shadow-xl: 0 20px 25px rgba(30, 58, 95, 0.12);
    --shadow-card: 0 4px 20px rgba(30, 58, 95, 0.08);
    --shadow-card-hover: 0 8px 30px rgba(30, 58, 95, 0.15);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Container */
    --container-max: 1280px;
    --container-padding: 1rem;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text-primary);
    background-color: var(--color-bg-white);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography Classes */
.font-serif {
    font-family: var(--font-serif);
}

.font-sans {
    font-family: var(--font-sans);
}

/* Heading Styles */
.heading-hero {
    font-family: var(--font-serif);
    font-weight: 500;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

.heading-section {
    font-family: var(--font-serif);
    font-weight: 500;
    letter-spacing: -0.01em;
    line-height: 1.2;
}

.heading-card {
    font-family: var(--font-serif);
    font-weight: 500;
    line-height: 1.3;
}

.body-text {
    font-family: var(--font-sans);
    font-weight: 400;
    line-height: 1.6;
}

.label-text {
    font-family: var(--font-sans);
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-size: var(--text-xs);
}

/* Utility Classes */
.text-primary { color: var(--color-primary); }
.text-primary-light { color: var(--color-primary-light); }
.text-accent { color: var(--color-accent); }
.text-accent-light { color: var(--color-accent-light); }

.bg-primary { background-color: var(--color-primary); }
.bg-primary-light { background-color: var(--color-primary-light); }
.bg-accent { background-color: var(--color-accent); }
.bg-sky { background-color: var(--color-sky); }
.bg-sky-light { background-color: var(--color-sky-light); }

/* Container */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding-left: var(--container-padding);
    padding-right: var(--container-padding);
}

@media (min-width: 640px) {
    :root {
        --container-padding: 1.5rem;
    }
}

@media (min-width: 1024px) {
    :root {
        --container-padding: 2rem;
    }
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-sm);
    font-weight: 500;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--color-accent);
    color: white;
    border: 1px solid var(--color-accent);
}

.btn-primary:hover {
    background-color: var(--color-accent-dark);
    border-color: var(--color-accent-dark);
}

.btn-outline {
    background-color: transparent;
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.btn-outline-dark {
    background-color: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-border);
}

.btn-outline-dark:hover {
    background-color: var(--color-sky);
    border-color: var(--color-accent);
}

/* Card Styles */
.card {
    background-color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-card-hover);
}

.card-border {
    border: 1px solid var(--color-border);
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.8s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hover-lift {
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.hover-lift:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

/* Text Shadow */
.text-shadow {
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

/* Value Card */
.value-card {
    border-left: 3px solid var(--color-accent);
    padding-left: var(--space-6);
}

/* News Item */
.news-item {
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.news-item:hover {
    border-bottom-color: var(--color-accent);
}

/* Top Contact Bar */
.top-contact-bar {
    background-color: var(--color-primary);
    color: white;
    font-size: var(--text-sm);
    padding: var(--space-2) 0;
}

.top-contact-bar a {
    color: white;
    text-decoration: none;
    transition: color var(--transition-base);
}

.top-contact-bar a:hover {
    color: var(--color-accent-light);
}

.contact-icon {
    width: 16px;
    height: 16px;
    margin-right: var(--space-2);
    flex-shrink: 0;
}

/* Navigation */
.navbar {
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 50;
    transition: all var(--transition-base);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border-light);
}

.navbar-scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.nav-link {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-base);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-link.active {
    color: var(--color-primary);
}

.nav-link.active::after {
    width: 100%;
}

/* Language Button */
.lang-btn {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
    background: transparent;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
}

.lang-btn:hover {
    background-color: var(--color-accent);
    color: white;
}

/* Section Styles */
.section {
    padding: var(--space-24) 0;
}

.section-header {
    margin-bottom: var(--space-12);
}

.section-label {
    color: var(--color-accent);
    font-size: var(--text-sm);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: var(--space-4);
}

/* Footer */
.footer {
    background-color: var(--color-primary);
    color: white;
    padding: var(--space-12) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-link {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color var(--transition-base);
}

.footer-link:hover {
    color: white;
}

/* Page Header (for sub-pages) */
.page-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: white;
    padding: var(--space-24) 0 var(--space-16);
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.page-header-content {
    position: relative;
    z-index: 1;
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--space-4);
}

.breadcrumb a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumb a:hover {
    color: white;
}

.breadcrumb-separator {
    opacity: 0.5;
}

/* Filter Tabs */
.filter-tabs {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
    margin-bottom: var(--space-8);
}

.filter-tab {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    background-color: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
}

.filter-tab:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.filter-tab.active {
    background-color: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

/* Article Card (for News/Insights) */
.article-card {
    display: flex;
    flex-direction: column;
    background-color: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: all var(--transition-base);
    text-decoration: none;
    color: inherit;
}

.article-card:hover {
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-4px);
}

.article-card-image {
    position: relative;
    aspect-ratio: 16 / 10;
    overflow: hidden;
}

.article-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.article-card:hover .article-card-image img {
    transform: scale(1.05);
}

.article-card-tag {
    position: absolute;
    top: var(--space-4);
    left: var(--space-4);
    background-color: var(--color-accent);
    color: white;
    font-size: var(--text-xs);
    font-weight: 500;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.article-card-content {
    padding: var(--space-6);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.article-card-date {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    font-family: var(--font-serif);
    font-style: italic;
    margin-bottom: var(--space-2);
}

.article-card-title {
    font-family: var(--font-serif);
    font-size: var(--text-xl);
    font-weight: 500;
    color: var(--color-primary);
    line-height: 1.3;
    margin-bottom: var(--space-3);
    transition: color var(--transition-fast);
}

.article-card:hover .article-card-title {
    color: var(--color-accent);
}

.article-card-excerpt {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* List Item (for News list view) */
.article-list-item {
    display: flex;
    gap: var(--space-6);
    padding: var(--space-6) 0;
    border-bottom: 1px solid var(--color-border);
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-base);
}

.article-list-item:hover {
    border-bottom-color: var(--color-accent);
}

.article-list-date {
    flex-shrink: 0;
    width: 80px;
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    font-family: var(--font-serif);
    font-style: italic;
}

.article-list-content {
    flex: 1;
}

.article-list-title {
    font-family: var(--font-serif);
    font-size: var(--text-lg);
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: var(--space-1);
    transition: color var(--transition-fast);
}

.article-list-item:hover .article-list-title {
    color: var(--color-accent);
}

.article-list-excerpt {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-12);
}

.pagination-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    background-color: white;
    border: 1px solid var(--color-border);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.pagination-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.pagination-btn.active {
    background-color: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Search Box */
.search-box {
    position: relative;
    margin-bottom: var(--space-8);
}

.search-box input {
    width: 100%;
    padding: var(--space-4) var(--space-12) var(--space-4) var(--space-4);
    font-size: var(--text-base);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background-color: white;
    transition: all var(--transition-base);
}

.search-box input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(91, 141, 184, 0.1);
}

.search-box-icon {
    position: absolute;
    right: var(--space-4);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
}

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
    background: none;
    border: none;
    cursor: pointer;
    z-index: 60;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-primary);
    transition: all var(--transition-base);
}

/* Mobile Navigation Panel */
.mobile-nav-panel {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    z-index: 55;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-6);
    padding: var(--space-8);
}

.mobile-nav-panel.active {
    display: flex;
}

.mobile-nav-panel .nav-link {
    font-size: var(--text-xl);
    font-family: var(--font-serif);
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.mobile-nav-panel .nav-link:hover {
    color: var(--color-accent);
}

.mobile-nav-panel .lang-btn {
    margin-top: var(--space-4);
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }
}

/* Loading State */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--space-16) var(--space-8);
}

.empty-state-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-6);
    color: var(--color-text-light);
}

.empty-state-title {
    font-family: var(--font-serif);
    font-size: var(--text-xl);
    color: var(--color-primary);
    margin-bottom: var(--space-2);
}

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

/* Print Styles */
@media print {
    .navbar,
    .top-contact-bar,
    .footer,
    .pagination {
        display: none !important;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
    }
    
    .article-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
}