/* ============================================
   海外中国资讯聚合 - 样式表
   ============================================ */

/* CSS Variables / Design Tokens */
:root {
    /* Colors - Light Theme */
    --color-bg-primary: #f8fafc;
    --color-bg-secondary: #ffffff;
    --color-bg-tertiary: #f1f5f9;
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;

    /* Accent colors */
    --color-accent: #3b82f6;
    --color-accent-hover: #2563eb;
    --color-accent-light: #eff6ff;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-star: #fbbf24;

    /* Gradients */
    --gradient-accent: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.9) 0%, rgba(241, 245, 249, 0.6) 100%);

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Sizing */
    --sidebar-width: 280px;
    --header-height: 64px;
    --border-radius: 12px;
    --border-radius-sm: 8px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Typography */
    --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-bg-primary: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    --color-text-primary: #f8fafc;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #64748b;
    --color-border: #334155;
    --color-border-light: #1e293b;
    --color-accent-light: #1e3a5f;
    --gradient-card: linear-gradient(145deg, rgba(30, 41, 59, 0.9) 0%, rgba(51, 65, 85, 0.6) 100%);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-accent-hover);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ============================================
   Layout
   ============================================ */

.app {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform var(--transition-normal);
}

.sidebar-header {
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--color-border-light);
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar-toggle {
    display: none;
    padding: 8px;
    border-radius: var(--border-radius-sm);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

/* Sidebar Navigation */
.sidebar-nav {
    padding: 12px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--border-radius-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.nav-item:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.nav-item.active {
    background: var(--color-accent-light);
    color: var(--color-accent);
}

.nav-icon {
    font-size: 1.1rem;
}

.nav-text {
    flex: 1;
}

.nav-count {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 12px;
    background: var(--color-bg-tertiary);
    color: var(--color-text-muted);
}

.nav-item.active .nav-count {
    background: var(--color-accent);
    color: white;
}

.sidebar-divider {
    height: 1px;
    background: var(--color-border-light);
    margin: 8px 12px;
}

/* Sources Section */
.sidebar-section {
    flex: 1;
    overflow-y: auto;
    padding: 0 12px;
}

.section-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    padding: 8px 16px;
}

.sources-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.source-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    border-radius: var(--border-radius-sm);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.source-item:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.source-item.active {
    background: var(--color-accent-light);
    color: var(--color-accent);
}

.source-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-text-muted);
    flex-shrink: 0;
}

.source-item.active .source-dot {
    background: var(--color-accent);
}

.source-name {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.source-count {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--color-border-light);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    position: sticky;
    top: 0;
    height: var(--header-height);
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 50;
    backdrop-filter: blur(8px);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.mobile-menu-btn {
    display: none;
    padding: 8px;
    border-radius: var(--border-radius-sm);
    color: var(--color-text-secondary);
}

.page-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Search Box */
.search-box {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--color-bg-tertiary);
    padding: 8px 16px;
    border-radius: 24px;
    border: 1px solid transparent;
    transition: all var(--transition-fast);
}

.search-box:focus-within {
    background: var(--color-bg-secondary);
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-light);
}

.search-box svg {
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.search-box input {
    border: none;
    background: none;
    outline: none;
    font-size: 0.9rem;
    color: var(--color-text-primary);
    width: 200px;
}

.search-box input::placeholder {
    color: var(--color-text-muted);
}

/* Theme Toggle */
.theme-toggle {
    padding: 8px;
    border-radius: var(--border-radius-sm);
    font-size: 1.2rem;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--color-bg-tertiary);
}

.theme-icon-dark {
    display: none;
}

[data-theme="dark"] .theme-icon-light {
    display: none;
}

[data-theme="dark"] .theme-icon-dark {
    display: inline;
}

/* ============================================
   Articles
   ============================================ */

.articles-container {
    flex: 1;
    padding: 24px;
}

.articles-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 900px;
    margin: 0 auto;
}

/* Article Card */
.article-card {
    background: var(--gradient-card);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 20px 24px;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.article-card:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.article-card.read {
    opacity: 0.7;
}

.article-card-header {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 12px;
}

.article-card-content {
    flex: 1;
    min-width: 0;
}

.article-source {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-accent);
    background: var(--color-accent-light);
    padding: 4px 10px;
    border-radius: 4px;
    margin-bottom: 8px;
}

.article-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    line-height: 1.4;
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-summary {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 12px;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.article-card-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.star-btn {
    padding: 8px;
    border-radius: 50%;
    font-size: 1.2rem;
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
}

.star-btn:hover {
    background: var(--color-accent-light);
    color: var(--color-star);
}

.star-btn.starred {
    color: var(--color-star);
}

/* ============================================
   Article Page
   ============================================ */

.article-page .app {
    justify-content: center;
}

.article-view {
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    padding: 0 24px;
}

.article-header {
    position: sticky;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
    z-index: 50;
}

.back-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: var(--border-radius-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.back-btn:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.article-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.action-btn {
    padding: 8px 12px;
    border-radius: var(--border-radius-sm);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
}

.action-btn:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.star-icon {
    font-size: 1.3rem;
}

.star-icon.starred {
    color: var(--color-star);
}

/* Article Content */
.article-content {
    padding: 32px 0;
}

.article-content .article-meta {
    margin-bottom: 24px;
}

.source-badge {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-accent);
    background: var(--color-accent-light);
    padding: 6px 14px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.article-content .article-title {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 16px;
}

.warning-box {
    background: #fff3cd;
    border: 1px solid #ffeeba;
    color: #856404;
    padding: 16px;
    border-radius: var(--border-radius-sm);
    margin-bottom: 24px;
    font-size: 0.95rem;
}

[data-theme="dark"] .warning-box {
    background: #4d3e1c;
    border-color: #665224;
    color: #ffeeba;
}

/* Floating language toggle */
.floating-lang-toggle {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--color-accent);
    color: white;
    border: none;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    font-size: 24px;
    cursor: pointer;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-medium);
}

.floating-lang-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
}

.floating-lang-toggle:active {
    transform: scale(0.95);
}

.floating-lang-toggle:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

@media (max-width: 768px) {
    .floating-lang-toggle {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 20px;
    }
}

.article-info {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    font-size: 0.8rem;
    padding: 4px 12px;
    background: var(--color-bg-tertiary);
    border-radius: 16px;
    color: var(--color-text-secondary);
}

.article-body {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--color-text-primary);
}

.article-body p {
    margin-bottom: 1.5em;
}

.article-body h2,
.article-body h3 {
    margin-top: 2em;
    margin-bottom: 1em;
    font-weight: 600;
}

.article-body img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius-sm);
    margin: 1.5em 0;
}

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

.article-body blockquote {
    border-left: 4px solid var(--color-accent);
    padding-left: 1em;
    margin: 1.5em 0;
    color: var(--color-text-secondary);
    font-style: italic;
}

.article-footer {
    padding: 24px 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.original-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--gradient-accent);
    color: white;
    border-radius: 24px;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.original-link-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

/* ============================================
   Components
   ============================================ */

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: var(--gradient-accent);
    color: white;
    width: 100%;
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-icon {
    font-size: 1rem;
}

/* Loading */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    color: var(--color-text-muted);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

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

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--color-text-muted);
}

.empty-state h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

/* Error State */
.error-state {
    text-align: center;
    padding: 60px 20px;
}

.error-state h2 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.error-state p {
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

/* Pagination */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.pagination-btn {
    padding: 10px 20px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    color: var(--color-text-primary);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.pagination-btn:hover:not(:disabled) {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

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

.pagination-info {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 12px 24px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-lg);
    font-weight: 500;
    opacity: 0;
    transition: all var(--transition-normal);
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    border-color: var(--color-success);
    color: var(--color-success);
}

.toast.error {
    border-color: var(--color-error);
    color: var(--color-error);
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-xl);
    }

    .main-content {
        margin-left: 0;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .sidebar-toggle {
        display: flex;
    }

    .search-box input {
        width: 150px;
    }
}

@media (max-width: 640px) {
    .header {
        padding: 0 16px;
    }

    .articles-container {
        padding: 16px;
    }

    .article-card {
        padding: 16px;
    }

    .article-card-header {
        flex-direction: column-reverse;
        gap: 12px;
    }

    .article-card-actions {
        flex-direction: row;
        align-self: flex-end;
    }

    .search-box {
        display: none;
    }

    .article-content .article-title {
        font-size: 1.5rem;
    }

    .article-view {
        padding: 0 16px;
    }
}

/* Overlay for mobile sidebar */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 90;
}

.sidebar-overlay.show {
    display: block;
}