/* SinoXivs Unified Styles - 左右结构布局 */

/* ===== CSS Variables ===== */
:root {
    --primary: #2563eb;
    --primary-light: #3b82f6;
    --primary-dark: #1d4ed8;
    --primary-gradient: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --bg-primary: #fff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-base: 14px;
    --font-size-sm: 13px;
    --font-size-xs: 12px;
    --font-size-lg: 15px;
    --font-size-xl: 16px;
    --font-size-2xl: 18px;
    --font-size-3xl: 20px;
    --font-size-4xl: 24px;
    --font-size-5xl: 28px;
    --sidebar-width: 320px;
    --content-max-width: 1400px;
}

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

html {
    scroll-behavior: smooth;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s ease;
}

img {
    max-width: 100%;
    height: auto;
}

/* ===== Layout ===== */
.page-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.main-container {
    display: flex;
    gap: 20px;
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 16px 48px;
    flex: 1;
}

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

.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
}

/* ===== Header ===== */
.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-top {
    display: flex;
    align-items: center;
    padding: 12px 48px;
    max-width: var(--content-max-width);
    margin: 0 auto;
    gap: 32px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--primary);
    flex-shrink: 0;
}

.logo img {
    width: 36px;
    height: 36px;
    object-fit: contain;
}

/* ===== Navigation ===== */
.nav-main {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-right: auto;
}

.nav-item {
    position: relative;
}

.nav-item > a {
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    font-weight: 500;
    padding: 8px 0;
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

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

.nav-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 8px 0;
    min-width: 200px;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.2s ease;
}

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

.nav-dropdown a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

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

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 20px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn-sm {
    padding: 6px 14px;
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: 12px 28px;
    font-size: var(--font-size-lg);
}

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

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
}

.btn-primary {
    background: var(--primary-gradient);
    color: #fff;
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.btn-secondary:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

/* ===== Banner ===== */
.banner {
    background: linear-gradient(135deg, #1e3a5f 0%, var(--primary) 100%);
    padding: 32px 48px;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.banner-content {
    max-width: var(--content-max-width);
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.banner-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    margin-bottom: 12px;
}

.banner-subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.9;
}

/* ===== Breadcrumb ===== */
.breadcrumb-nav {
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    padding: 0;
}

.breadcrumb {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 12px 48px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

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

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb i {
    font-size: 10px;
    color: var(--text-muted);
}

/* ===== Cards ===== */
.card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    margin-bottom: 16px;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.card-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-primary);
}

.card-header i {
    color: var(--primary);
    font-size: var(--font-size-xl);
}

/* ===== Sidebar Widgets ===== */
.sidebar-widget {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 16px;
    margin-bottom: 16px;
}

.sidebar-widget h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.sidebar-widget h3 i {
    color: var(--primary);
}

.sidebar-list {
    list-style: none;
}

.sidebar-list li {
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-list li:last-child {
    border-bottom: none;
}

.sidebar-list li i {
    color: var(--text-muted);
    width: 20px;
    text-align: center;
}

.sidebar-list li a {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.sidebar-list li a:hover {
    color: var(--primary);
}

/* ===== Stats ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin: 16px 0;
}

.stat-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    text-align: center;
    transition: all 0.2s ease;
}

.stat-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* ===== Forms ===== */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: inherit;
    background: var(--bg-primary);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

/* ===== Tables ===== */
.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.table td {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* ===== Fixed Sidebar ===== */
.fixed-sidebar {
    position: fixed;
    right: 20px;
    bottom: 100px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 100;
}

.fixed-sidebar-item {
    width: 48px;
    height: 48px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    color: var(--text-secondary);
}

.fixed-sidebar-item:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.fixed-sidebar-item .tooltip {
    position: absolute;
    right: 56px;
    background: var(--text-primary);
    color: #fff;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
}

.fixed-sidebar-item:hover .tooltip {
    opacity: 1;
    visibility: visible;
}

/* ===== Footer ===== */
.footer {
    background: var(--text-primary);
    color: #fff;
    padding: 40px 48px 24px;
    margin-top: auto;
    border-top: none;
}

.footer-top {
    gap: 32px;
    margin-bottom: 24px;
}

.footer-brand .logo {
    margin-bottom: 10px;
}

.footer-brand p {
    margin-bottom: 10px;
    line-height: 1.5;
}

.social-links {
    margin-top: 10px;
    gap: 10px;
}

.social-links a {
    width: 28px;
    height: 28px;
}

.footer-section h4 {
    margin-bottom: 12px;
    color: #ffffffcc;
}

.footer-section a {
    margin-bottom: 6px;
    font-size: var(--font-size-sm);
}

.footer-section a:hover {
    color: #fff;
}

.footer-friends {
    padding: 12px 0;
    margin-bottom: 16px;
    border-top: 1px solid #ffffff15;
    border-bottom: 1px solid #ffffff15;
}

.footer-friends a {
    opacity: 0.5;
    transition: opacity 0.2s ease;
}

.footer-friends a:hover {
    opacity: 0.8;
}

.footer-content {
    max-width: var(--content-max-width);
    margin: 0 auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 32px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 16px;
}

.footer-logo img {
    width: 32px;
    height: 32px;
}

.footer-desc {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.footer-social a {
    width: 36px;
    height: 36px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.footer-social a:hover {
    background: var(--primary);
    color: #fff;
}

.footer-column h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    transition: color 0.2s ease;
}

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

.footer-bottom {
    padding-top: 16px;
    border-top: 1px solid #ffffff1a;
    text-align: center;
    color: #ffffff99;
    font-size: var(--font-size-sm);
}

/* ===== Responsive ===== */
@media (max-width: 1200px) {
    .main-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .header-top {
        padding: 12px 24px;
    }
    
    .main-container {
        padding: 24px;
    }
    
    .banner {
        padding: 32px 24px;
    }
    
    .banner-title {
        font-size: var(--font-size-3xl);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .fixed-sidebar {
        display: none;
    }
    
    .breadcrumb {
        padding: 12px 24px;
    }
}

/* ===== Utility Classes ===== */
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }

.p-0 { padding: 0; }
.p-1 { padding: 8px; }
.p-2 { padding: 16px; }
.p-3 { padding: 24px; }
.p-4 { padding: 32px; }

/* ===== Legal Pages (Terms / Privacy) ===== */
.legal-content {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    line-height: 1.8;
    color: var(--text-primary);
}

.legal-section {
    margin-bottom: 36px;
}

.legal-section:last-of-type {
    margin-bottom: 0;
}

.legal-section h2 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 18px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary);
    display: inline-block;
}

.legal-section p {
    margin-bottom: 14px;
    text-align: justify;
    font-size: var(--font-size-base);
}

.legal-section ul {
    margin: 12px 0 16px 24px;
    padding-left: 12px;
    list-style-type: disc;
}

.legal-section ul li {
    margin-bottom: 10px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.legal-date {
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    text-align: right;
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

.legal-date p {
    margin-bottom: 4px;
}

/* ===== Sidebar Card ===== */
.sidebar-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    margin-bottom: 16px;
}

.sidebar-card h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.sidebar-card h3 i {
    color: var(--primary);
}

.sidebar-text {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.quick-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.quick-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: all 0.2s ease;
}

.quick-link:hover {
    background: var(--bg-tertiary);
    color: var(--primary);
}

.quick-link i {
    width: 18px;
    text-align: center;
    color: var(--primary);
}

/* Responsive legal pages */
@media (max-width: 768px) {
    .legal-content {
        padding: 24px;
    }

    .legal-section h2 {
        font-size: var(--font-size-lg);
    }
}