/* Cyber-Apple Pro Theme v2.1 (Anti-FOUC) */

/* Disable transitions during load */
.no-transition * {
    transition: none !important;
}

:root {
    /* --- Light Mode (Default / Apple Clean) --- */
    --bg-body: #F5F5F7;
    --bg-card: #FFFFFF;
    --bg-header: rgba(255, 255, 255, 0.85);
    --bg-input: #f2f2f7;
    
    --text-main: #1d1d1f;
    --text-muted: #86868b;
    
    --border-color: rgba(0, 0, 0, 0.08);
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
    
    --accent-primary: #0071e3;
    --accent-secondary: #5e5ce6;
    --accent-glow: rgba(0, 113, 227, 0.3);
    
    --radius-card: 16px;
    --radius-btn: 8px;
    
    --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    
    --transition-speed: 0.3s;
}

[data-theme="dark"] {
    /* --- Dark Mode (Cyberpunk Pro) --- */
    --bg-body: #050505; /* Deep Black */
    --bg-card: #151516;
    --bg-header: rgba(20, 20, 20, 0.95);
    --bg-input: #1c1c1e;
    
    --text-main: #f5f5f7;
    --text-muted: #b0b0b5;
    
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-card: 0 0 20px rgba(0, 243, 255, 0.05);
    --shadow-hover: 0 0 30px rgba(0, 243, 255, 0.15);
    
    --accent-primary: #00f3ff;
    --accent-secondary: #bc13fe;
    --accent-glow: rgba(0, 243, 255, 0.4);
}

/* ================= 无障碍访问优化 ================= */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--accent-primary);
    color: white;
    padding: 8px 16px;
    text-decoration: none;
    z-index: 99999;
    font-size: 0.9rem;
    border-radius: 0 0 4px 0;
    transition: top 0.3s ease;
}

.skip-to-content:focus {
    top: 0;
    outline: 3px solid var(--accent-glow);
    outline-offset: 2px;
}

/* 键盘焦点可见性增强 */
*:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .skip-to-content {
        background: #000;
        color: #fff;
        border: 2px solid #fff;
    }
}

/* ================= Global Reset & Typography ================= */
body {
    background-color: var(--bg-body) !important;
    color: var(--text-main) !important;
    font-family: var(--font-stack) !important;
    transition: background-color 0.3s ease, color 0.3s ease;
    line-height: 1.6;
    letter-spacing: -0.01em;
}

/* Ensure consistent box-sizing */
*, *::before, *::after {
    box-sizing: border-box;
}

/* Mobile Performance Optimization */
@media (max-width: 768px) {
    .navbar {
        backdrop-filter: none !important;
        -webkit-backdrop-filter: none !important;
        /* Fallback for no-blur: slightly more opaque background */
        background-color: var(--bg-header) !important; 
    }
    
    [data-theme="dark"] .navbar {
        background-color: rgba(20, 20, 20, 0.98) !important;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* ================= Header / Navbar ================= */
.navbar {
    background-color: var(--bg-header) !important;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: none !important; /* Flat modern look */
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 0.8rem 1rem; /* Increase height slightly */
    transition: all 0.3s ease;
}

.navbar-brand {
    font-weight: 800;
    font-size: 1.5rem;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: opacity 0.3s;
}

.navbar-brand:hover {
    opacity: 0.8;
}

.nav-link {
    color: var(--text-muted) !important;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 1rem !important;
    border-radius: 8px;
    transition: all 0.2s ease;
    margin: 0 2px;
}

.nav-link:hover, .nav-item.active .nav-link {
    color: var(--accent-primary) !important;
    background-color: var(--bg-input);
}

/* User Avatar in Nav */
.navbar .avatar-1 {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    margin-right: 6px;
    border: 1px solid var(--border-color);
}

/* Navbar Toggler */
.navbar-toggler {
    border: none;
    padding: 0;
    color: var(--text-main);
}

.navbar-toggler:focus {
    outline: none;
}

/* Mobile Menu */
@media (max-width: 991px) {
    .navbar-collapse {
        background-color: var(--bg-card);
        padding: 1rem;
        border-radius: 12px;
        margin-top: 10px;
        box-shadow: var(--shadow-card);
        border: 1px solid var(--border-color);
    }
    
    .nav-item {
        margin-bottom: 5px;
    }
}

/* Fix Toggle Button Visibility */
#theme-toggle {
    color: var(--text-main) !important;
    font-size: 1.1rem;
    padding: 8px;
    border-radius: 50%;
    transition: background-color 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
}
#theme-toggle:hover {
    background-color: var(--bg-input);
    color: var(--accent-primary) !important;
}
/* Force icon color specifically */
[data-theme="dark"] #theme-toggle,
[data-theme="dark"] #theme-toggle i {
    color: #ffffff !important; /* Pure White in Dark Mode */
    text-shadow: none !important; /* No Glow */
}
[data-theme="light"] #theme-toggle,
[data-theme="light"] #theme-toggle i {
    color: #000000 !important; /* Pure Black in Light Mode */
    text-shadow: none !important;
}
[data-theme="dark"] #theme-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* ================= Cards & Containers ================= */
.card {
    background-color: var(--bg-card) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: var(--radius-card) !important;
    box-shadow: var(--shadow-card) !important;
    margin-bottom: 24px;
}

/* Reduce visual conflict between card header and card body in dark mode */
[data-theme="dark"] .card {
    border-color: rgba(255, 255, 255, 0.08) !important;
    box-shadow: 0 2px 8px rgba(0, 243, 255, 0.03) !important;
}

/* Subtle hover lift effect - REMOVED */

.card-header {
    background-color: transparent !important;
    border-bottom: 1px solid var(--border-color) !important;
    font-weight: 600;
    color: var(--text-main) !important;
    padding: 16px 24px !important;
}

[data-theme="dark"] .card-header {
    border-bottom-color: rgba(255, 255, 255, 0.08) !important;
    background-color: var(--bg-card) !important; /* Force dark background */
}

/* Special handling for card-header with tabs */
.card-header .card-header-tabs {
    margin: 0; /* 移除负边距，防止宽度超出 */
    width: auto; /* 自动宽度 */
}

.card-body {
    padding: 24px !important;
}

.card-footer {
    background-color: transparent !important;
    border-top: 1px solid var(--border-color) !important;
}

/* ================= Buttons ================= */
.btn {
    border-radius: var(--radius-btn) !important;
    font-weight: 600;
    letter-spacing: 0.02em;
    padding: 8px 20px;
    transition: all 0.2s ease;
    border: none !important;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary)) !important;
    color: #fff !important;
    box-shadow: 0 4px 10px var(--accent-glow);
}

.btn-primary:hover {
    opacity: 0.9;
    box-shadow: 0 6px 15px var(--accent-glow);
}

.btn-secondary {
    background-color: var(--bg-input) !important;
    color: var(--text-main) !important;
}

.btn-secondary:hover {
    background-color: var(--border-color) !important;
}

/* ================= Inputs ================= */
.form-control, .custom-select {
    background-color: var(--bg-input) !important;
    border: 1px solid transparent !important;
    border-radius: var(--radius-btn) !important;
    color: var(--text-main) !important;
    padding: 6px 16px; /* 恢复原始内边距，避免影响编辑器 */
    transition: all 0.2s ease;
}

/* 
   CRITICAL FIX: Do NOT force height on textareas.
   Let rows attribute or CSS height take effect.
*/
textarea.form-control {
    min-height: 200px; /* Enforce a taller default */
    padding: 12px;
}

/* Restore proper height for text inputs and selects */
input.form-control {
    height: calc(1.5em + 0.75rem + 2px) !important; /* Bootstrap 4 Standard Height */
    min-height: 38px;
}

select.form-control, select.custom-select {
    min-height: 42px !important;
    line-height: 1.8 !important; /* 确保文字完全显示，不被截断 */
    padding-top: 8px !important;
    padding-bottom: 8px !important;
    height: auto !important; /* 移除固定高度限制，只针对选择框 */
}

/* Fix Dropdown/Select truncation */
.custom-select {
    padding-top: 8px !important;
    padding-bottom: 8px !important;
    padding-left: 16px;
    padding-right: 1.75rem; /* Space for arrow */
}

.form-control:focus {
    background-color: var(--bg-card) !important;
    border-color: var(--accent-primary) !important;
    box-shadow: 0 0 0 3px var(--accent-glow) !important;
}

/* Fix harsh white background on hover in dark mode */
.thread:hover, .table-hover tbody tr:hover {
    background-color: var(--bg-input) !important; 
    /* Ensure var(--bg-input) is dark in dark mode: #1c1c1e */
}

/* Fix Breadcrumb Background */
.breadcrumb {
    background-color: transparent !important;
    padding: 0.75rem 0;
}

/* Enhanced Breadcrumb for Dark Mode */
[data-theme="dark"] .breadcrumb {
    background-color: var(--bg-input) !important;
    border-radius: var(--radius-btn);
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 243, 255, 0.05);
}

[data-theme="dark"] .breadcrumb-item {
    color: var(--text-muted);
}

[data-theme="dark"] .breadcrumb-item a {
    color: var(--text-main);
    text-decoration: none;
    transition: color var(--transition-speed) ease;
}

[data-theme="dark"] .breadcrumb-item.active {
    color: var(--accent-primary);
    font-weight: 500;
}

[data-theme="dark"] .breadcrumb-item + .breadcrumb-item::before {
    color: var(--accent-secondary);
    content: ">";
    padding: 0 0.5rem;
}

/* Fix Breadcrumb Hover */
.breadcrumb-item a:hover {
    color: var(--accent-primary) !important;
    text-decoration: none;
    background-color: transparent !important;
}

[data-theme="dark"] .breadcrumb-item a:hover {
    color: var(--accent-secondary) !important;
    text-shadow: 0 0 8px var(--accent-glow);
}

/* Fix Dropdown Menu Backgrounds */
.dropdown-menu {
    background-color: var(--bg-card) !important;
    border-color: var(--border-color) !important;
}

.dropdown-item {
    color: var(--text-main) !important;
}

.dropdown-item:hover, .dropdown-item:focus {
    background-color: var(--bg-input) !important;
    color: var(--text-main) !important;
}

/* ================= Thread List (Feed Stream) ================= */

/* Make the container transparent to show "Floating Cards" */
.card-threadlist {
    background-color: transparent !important;
    box-shadow: none !important;
    border: none !important;
}

/* Minimalist Filter Bar (Tabs) */
.card-threadlist .card-header {
    background: transparent !important;
    background-color: transparent !important;
    border: none !important;
    box-shadow: none !important;
    padding: 0 0 16px 0 !important;
    margin-bottom: 0;
}

/* ================= 二级导航栏简洁样式 ================= */
/* 简洁设计，与下方容器对齐 */

.card-header-tabs {
    border-bottom: 1px solid var(--border-color) !important;
    margin-bottom: 0 !important;
    background: transparent !important;
    width: auto; /* 改为自动宽度，防止超出 */
    display: flex;
    flex-wrap: nowrap;
    gap: 0;
    padding: 0;
    background-color: transparent !important;
    border-radius: 0;
    border: none;
    box-shadow: none;
}

.card-header-tabs .nav-item {
    flex: 0 0 auto;
    margin: 0;
}

/* 确保导航栏不会挤压右侧下拉菜单 */
.card-header {
    gap: 16px;
}

.card-header-tabs {
    flex: 1;
    min-width: 0; /* 防止flex item溢出 */
}

.card-header-tabs .nav-link {
    border: 1px solid transparent !important;
    border-bottom: none !important;
    background: transparent !important;
    background-color: transparent !important;
    color: var(--text-muted) !important;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.75rem 1.5rem !important;
    margin: 0;
    position: relative;
    border-radius: var(--radius-btn) var(--radius-btn) 0 0 !important;
    text-align: center;
    transition: all var(--transition-speed) ease;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
}

/* 悬停状态 */
.card-header-tabs .nav-link:hover {
    color: var(--accent-primary) !important;
    background-color: rgba(0, 113, 227, 0.05) !important;
}

/* 焦点状态 - 键盘导航 */
.card-header-tabs .nav-link:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* 禁用状态 */
.card-header-tabs .nav-link.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 激活状态 */
.card-header-tabs .nav-link.active {
    background-color: var(--bg-card) !important;
    color: var(--accent-primary) !important;
    border: 1px solid var(--border-color) !important;
    border-bottom-color: var(--bg-card) !important;
    font-weight: 600;
    box-shadow: none;
    position: relative;
}

/* 激活状态的底部指示器 */
.card-header-tabs .nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    margin: 0 auto;
    width: 80%;
    max-width: 100px;
    height: 2px;
    background-color: var(--accent-primary);
    border-radius: 1px;
}

/* Specific fix for Dark Mode Text Color - 保持与浅色模式一致 */
[data-theme="dark"] .card-header-tabs .nav-link {
    color: var(--text-muted) !important;
}

[data-theme="dark"] .card-header-tabs .nav-link.active {
    color: var(--accent-primary) !important;
}

[data-theme="dark"] .card-header-tabs .nav-link:hover {
    color: var(--accent-primary) !important;
}

/* Fix user menu background in dark mode */
.nav-item.username .nav-link {
    background-color: transparent;
}

[data-theme="dark"] .nav-item.username .nav-link {
    background-color: transparent;
    color: var(--text-main) !important;
}

[data-theme="dark"] .nav-item.username .nav-link:hover {
    background-color: var(--bg-input);
    color: var(--accent-primary) !important;
}

.card-header-tabs .nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px; /* Short indicator */
    height: 3px;
    background: var(--accent-primary);
    border-radius: 3px;
}

.card-threadlist .card-body {
    padding: 0 !important;
}

/* Individual Thread Cards */
.thread {
    background-color: var(--bg-card);
    margin-bottom: 12px;
    padding: 20px;
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--border-color);
}

.thread:hover {
    background-color: var(--bg-card) !important; 
}

.thread .subject {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 6px;
    display: block;
}

.thread .subject a {
    color: var(--text-main);
    text-decoration: none;
}

.thread .subject a:hover {
    color: var(--accent-primary);
}

/* Sticky Sidebar */
.aside {
    position: -webkit-sticky; /* Safari support */
    position: sticky;
    top: 30px; /* Adjusted offset as requested */
    z-index: 10;
    align-self: flex-start !important; /* CRITICAL: Prevents flex item from stretching to full height */
    height: auto !important; /* Ensure height is determined by content */
    max-height: calc(100vh - 40px); /* Adjusted max-height to match new top offset */
    overflow-y: auto; /* Optional: Scroll internal content if too tall */
}

/* Modern Pagination */
.pagination .page-item {
    margin: 0 4px;
}

.pagination .page-link {
    border-radius: 8px !important;
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    color: var(--text-main);
    padding: 8px 16px;
}

.pagination .page-item.active .page-link {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
    color: #fff;
    box-shadow: 0 4px 10px var(--accent-glow);
}

.pagination .page-link:hover {
    background-color: var(--bg-input);
    color: var(--accent-primary);
}

/* Badges */
.badge {
    padding: 5px 10px;
    border-radius: 6px;
    font-weight: 600;
}
.badge-primary {
    background-color: rgba(0, 113, 227, 0.1) !important; /* Transparent Blue */
    color: var(--accent-primary) !important;
}
[data-theme="dark"] .badge-primary {
    background-color: rgba(0, 243, 255, 0.15) !important;
    color: var(--accent-primary) !important;
}

/* Back to Top FAB */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--bg-card);
    color: var(--accent-primary);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 9999;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

#back-to-top.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

#back-to-top:hover {
    background-color: var(--accent-primary);
    color: #fff;
    box-shadow: 0 6px 20px var(--accent-glow);
}

[data-theme="dark"] #back-to-top:hover {
    color: #000;
}

/* ================= Tables ================= */
.table {
    /* color: var(--text-main) !important; Removed forced color to respect inline styles */
    background-color: transparent !important;
}

.table th, .table td {
    /* border-top: 1px solid var(--border-color) !important; Removed forced border */
    /* border-bottom: 1px solid var(--border-color) !important; Removed forced border */
}

.table thead th {
    /* border-bottom: 2px solid var(--border-color) !important; Removed forced border */
    /* color: var(--text-muted); Removed forced color */
}

.table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(0, 0, 0, 0.02) !important;
}

.table-hover tbody tr:hover {
    background-color: var(--bg-input) !important;
}

[data-theme="dark"] .table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(255, 255, 255, 0.05) !important;
}

/* Ensure table text is readable in dark mode */
[data-theme="dark"] .table td {
    color: var(--text-main) !important;
}

/* Fix Bootstrap Text Colors for Dark Mode */
[data-theme="dark"] .text-success {
    color: #4cd964 !important; /* Brighter Green */
}

[data-theme="dark"] .text-danger {
    color: #ff453a !important; /* Brighter Red */
}

[data-theme="dark"] .text-muted {
    color: #98989d !important;
}

/* ================= Mobile Bottom Navigation ================= */
.mobile-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 68px; /* Increased height for better touch target */
    background-color: var(--bg-card);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 9999;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
    padding-bottom: env(safe-area-inset-bottom); /* iOS Safe Area */
    padding-top: 8px; /* Add padding for better touch target */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    -webkit-tap-highlight-color: transparent; /* Remove tap highlight */
}

.mobile-bottom-nav .nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 8px 12px; /* Increased padding for better touch target */
    border-radius: 12px; /* Larger touch area */
    color: var(--text-muted);
    text-decoration: none;
    transition: all 0.2s ease;
    min-height: 48px; /* Minimum touch target size */
    min-width: 48px; /* Minimum touch target size */
    position: relative;
}

.mobile-bottom-nav .nav-item:hover,
.mobile-bottom-nav .nav-item:active,
.mobile-bottom-nav .nav-item:focus {
    color: var(--accent-primary);
    background-color: var(--bg-input);
    transform: translateY(-2px);
}

.mobile-bottom-nav .nav-item.active {
    color: var(--accent-primary);
    font-weight: 600;
}

.mobile-bottom-nav .nav-item i {
    font-size: 20px; /* Slightly larger icons */
    margin-bottom: 4px;
}

.mobile-bottom-nav .nav-item span {
    font-size: 11px; /* Slightly larger text */
    font-weight: 500;
    letter-spacing: 0.3px;
}

.mobile-bottom-nav .center-btn {
    position: relative;
    top: -24px; /* More prominent center button */
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #fff;
    border-radius: 50%;
    width: 64px; /* Larger center button */
    height: 64px; /* Larger center button */
    box-shadow: 0 4px 20px var(--accent-glow);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.mobile-bottom-nav .center-btn:hover,
.mobile-bottom-nav .center-btn:active {
    transform: scale(1.1) translateY(-4px);
    box-shadow: 0 8px 30px var(--accent-glow);
}

.mobile-bottom-nav .center-btn .plus-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
}

.mobile-bottom-nav .center-btn i {
    font-size: 24px; /* Larger plus icon */
    margin-bottom: 0;
}

/* Improve touch feedback for mobile */
@media (hover: none) and (pointer: coarse) {
    .mobile-bottom-nav .nav-item:active {
        background-color: var(--bg-input);
        transform: scale(0.95);
    }
    
    .mobile-bottom-nav .center-btn:active {
        transform: scale(0.95) translateY(-4px);
    }
}

.mobile-bottom-nav .nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 10px;
    flex: 1;
    height: 100%;
    transition: color 0.2s;
}

.mobile-bottom-nav .nav-item i {
    font-size: 20px;
    margin-bottom: 2px;
}

.mobile-bottom-nav .nav-item.active {
    color: var(--accent-primary);
    font-weight: 600;
}

.mobile-bottom-nav .center-btn {
    position: relative;
    top: -20px;
    overflow: visible;
}

.mobile-bottom-nav .plus-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: 0 4px 10px var(--accent-glow);
    transition: transform 0.2s;
}

.mobile-bottom-nav .plus-icon i {
    font-size: 24px;
    margin: 0;
}

.mobile-bottom-nav .center-btn:active .plus-icon {
    transform: scale(0.9);
}

/* Adjust footer margin for mobile to prevent content being covered */
@media (max-width: 768px) {
    body {
        padding-bottom: 70px;
    }
    
    #back-to-top {
        bottom: 80px !important; /* Move FAB up */
    }
}

/* ================= Footer ================= */
#footer {
    background-color: var(--bg-card) !important;
    color: var(--text-muted) !important;
    border-top: 1px solid var(--border-color);
    padding: 60px 0; /* More breathing room */
    margin-top: 60px;
    font-size: 0.95rem;
}

#footer a {
    color: var(--text-muted);
    transition: color 0.2s;
}

#footer a:hover {
    color: var(--accent-primary);
    text-decoration: none;
}

/* Minimalist copyright text */
#footer .text-grey {
    color: var(--text-muted) !important;
}

/* ================= Scrollbar ================= */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-body);
}
::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 4px;
}
[data-theme="dark"] ::-webkit-scrollbar-thumb {
    background: #333;
}
[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}

/* ================= Editor Dark Mode Support ================= */

/* UMEditor / UEditor Container */
[data-theme="dark"] .edui-container {
    border-color: var(--border-color) !important;
    box-shadow: none !important;
    background-color: var(--bg-card) !important;
}

[data-theme="dark"] .edui-toolbar {
    background-color: var(--bg-input) !important;
    border-bottom: 1px solid var(--border-color) !important;
    box-shadow: none !important;
}

[data-theme="dark"] .edui-btn-toolbar .edui-btn {
    background: transparent !important;
    border: none !important;
}

/* Invert icons in dark mode to make them visible */
[data-theme="dark"] .edui-btn-toolbar .edui-btn .edui-icon {
    filter: invert(1) brightness(2);
}

[data-theme="dark"] .edui-body-container {
    background-color: var(--bg-card) !important;
    color: var(--text-main) !important;
}

[data-theme="dark"] .edui-body-container p {
    color: var(--text-main) !important;
}

/* WangEditor Support */
[data-theme="dark"] .w-e-toolbar {
    background-color: var(--bg-input) !important;
    border-color: var(--border-color) !important;
    color: var(--text-muted) !important;
}

[data-theme="dark"] .w-e-text-container {
    background-color: var(--bg-card) !important;
    border-color: var(--border-color) !important;
    color: var(--text-main) !important;
}

[data-theme="dark"] .w-e-toolbar .w-e-menu i {
    color: var(--text-main) !important;
}

[data-theme="dark"] .w-e-toolbar .w-e-menu:hover {
    background-color: rgba(255,255,255,0.1) !important;
}

/* Native Select Option Fix */
[data-theme="dark"] select option {
    background-color: #1a1a1a;
    color: #e0e0e0;
}

/* ================= Interactive Feedback Improvements ================= */

/* Define Custom Highlight Color (Pale Ice Blue / Cyan) */
:root {
    --hover-highlight: #5AC8FA; /* Light Mode: Pale Ice Blue */
}

[data-theme="dark"] {
    --hover-highlight: #64D2FF; /* Dark Mode: Brighter Ice Blue */
}

/* Card Hover Feedback - Color Change Only, No Movement */
.card {
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

.card:hover {
    border-color: var(--hover-highlight) !important;
    /* Subtle background tint on hover */
    background-color: rgba(255, 255, 255, 1) !important; 
}

[data-theme="dark"] .card:hover {
    border-color: var(--hover-highlight) !important;
    background-color: #1a1a1c !important; /* Slightly lighter than #151516 */
}

/* Thread Item Feedback */
.thread {
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

.thread:hover {
    border-color: var(--hover-highlight) !important;
    background-color: var(--bg-card) !important;
}

[data-theme="dark"] .thread:hover {
    border-color: var(--hover-highlight) !important;
    background-color: #1a1a1c !important;
}

/* Button Active State - Press Effect */
.btn:active {
    transform: scale(0.96);
    opacity: 0.9;
}

/* ================= Back to Top Optimization ================= */
#back-to-top {
    /* Existing base styles remain, ensuring smooth transition */
    transition: opacity 0.3s ease, transform 0.3s ease, background-color 0.2s;
}

#back-to-top:hover {
    background-color: var(--hover-highlight);
    color: #fff;
    /* No movement, just color change */
    transform: translateY(0) scale(1.05); /* Slight scale up for feedback */
}

[data-theme="dark"] #back-to-top:hover {
    color: #000; /* Ensure text is readable on bright button in dark mode */
}

#back-to-top:active {
    transform: scale(0.9); /* Press down effect */
}

/* ================= Typography Optimization ================= */
body {
    line-height: 1.75 !important; /* Increased from 1.6 */
}

p {
    margin-bottom: 1.25rem; /* More breathing room between paragraphs */
}

.message {
    font-size: 1.05rem; /* Slightly larger text for reading */
    line-height: 1.8;
}

/* Table Readability */
.table td, .table th {
    padding: 16px 12px !important; /* More spacing in tables */
}

[data-theme="dark"] .alert {
    background-color: var(--bg-input) !important;
    border-color: var(--border-color) !important;
    color: var(--text-main) !important;
}

[data-theme="dark"] .alert-success {
    background-color: rgba(76, 217, 100, 0.1) !important;
    border-color: rgba(76, 217, 100, 0.3) !important;
    color: #4cd964 !important;
}

[data-theme="dark"] .alert-danger {
    background-color: rgba(255, 69, 58, 0.1) !important;
    border-color: rgba(255, 69, 58, 0.3) !important;
    color: #ff453a !important;
}

[data-theme="dark"] .alert-warning {
    background-color: rgba(255, 204, 0, 0.1) !important;
    border-color: rgba(255, 204, 0, 0.3) !important;
    color: #ffcc00 !important;
}

[data-theme="dark"] .alert-info {
    background-color: rgba(0, 113, 227, 0.1) !important;
    border-color: rgba(0, 113, 227, 0.3) !important;
    color: var(--accent-primary) !important;
}

/* Modal Dark Mode Support */
[data-theme="dark"] .modal-content {
    background-color: var(--bg-card) !important;
    border-color: var(--border-color) !important;
    color: var(--text-main) !important;
}

[data-theme="dark"] .modal-header {
    border-bottom-color: var(--border-color) !important;
}

[data-theme="dark"] .modal-footer {
    border-top-color: var(--border-color) !important;
}

/* Tooltip Dark Mode Support */
[data-theme="dark"] .tooltip-inner {
    background-color: var(--bg-input) !important;
    color: var(--text-main) !important;
    border: 1px solid var(--border-color) !important;
}

[data-theme="dark"] .tooltip-arrow {
    border-top-color: var(--border-color) !important;
}

/* Popover Dark Mode Support */
[data-theme="dark"] .popover {
    background-color: var(--bg-card) !important;
    border-color: var(--border-color) !important;
    color: var(--text-main) !important;
}

[data-theme="dark"] .popover-header {
    background-color: var(--bg-input) !important;
    border-bottom-color: var(--border-color) !important;
    color: var(--text-main) !important;
}

[data-theme="dark"] .popover-body {
    color: var(--text-main) !important;
}

/* Button Outline Dark Mode Support */
[data-theme="dark"] .btn-outline-primary {
    color: var(--accent-primary) !important;
    border-color: var(--accent-primary) !important;
}

[data-theme="dark"] .btn-outline-primary:hover {
    background-color: var(--accent-primary) !important;
    color: #000 !important;
}

[data-theme="dark"] .btn-outline-secondary {
    color: var(--text-muted) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .btn-outline-secondary:hover {
    background-color: var(--bg-input) !important;
    color: var(--text-main) !important;
}

[data-theme="dark"] .btn-outline-success {
    color: #4cd964 !important;
    border-color: #4cd964 !important;
}

[data-theme="dark"] .btn-outline-success:hover {
    background-color: #4cd964 !important;
    color: #000 !important;
}

[data-theme="dark"] .btn-outline-danger {
    color: #ff453a !important;
    border-color: #ff453a !important;
}

[data-theme="dark"] .btn-outline-danger:hover {
    background-color: #ff453a !important;
    color: #000 !important;
}

[data-theme="dark"] .btn-outline-warning {
    color: #ffcc00 !important;
    border-color: #ffcc00 !important;
}

[data-theme="dark"] .btn-outline-warning:hover {
    background-color: #ffcc00 !important;
    color: #000 !important;
}

[data-theme="dark"] .btn-outline-info {
    color: var(--accent-primary) !important;
    border-color: var(--accent-primary) !important;
}

[data-theme="dark"] .btn-outline-info:hover {
    background-color: var(--accent-primary) !important;
    color: #000 !important;
}

/* List Group Dark Mode Support */
[data-theme="dark"] .list-group-item {
    background-color: var(--bg-card) !important;
    border-color: var(--border-color) !important;
    color: var(--text-main) !important;
}

[data-theme="dark"] .list-group-item.active {
    background-color: var(--accent-primary) !important;
    border-color: var(--accent-primary) !important;
    color: #000 !important;
}

[data-theme="dark"] .list-group-item-action:hover {
    background-color: var(--bg-input) !important;
}

/* Card Header/Footer Dark Mode Support - ULTRA HIGH SPECIFICITY FORCE */
html[data-theme="dark"] body .card > .card-header,
html[data-theme="dark"] body .card > .card-footer,
[data-theme="dark"] .card-header,
[data-theme="dark"] .card-footer {
    background-color: var(--bg-card) !important;
    border-bottom-color: var(--border-color) !important;
    border-top-color: var(--border-color) !important;
    color: var(--text-main) !important;
    background-image: none !important;
}

/* Form Control Dark Mode Support */
[data-theme="dark"] .form-control {
    background-color: var(--bg-input) !important;
    border-color: var(--border-color) !important;
    color: var(--text-main) !important;
}

[data-theme="dark"] .form-control:focus {
    background-color: var(--bg-input) !important;
    border-color: var(--accent-primary) !important;
    color: var(--text-main) !important;
    box-shadow: 0 0 0 0.2rem rgba(0, 113, 227, 0.25) !important;
}

[data-theme="dark"] .form-control::placeholder {
    color: var(--text-muted) !important;
}

[data-theme="dark"] .input-group-text {
    background-color: var(--bg-input) !important;
    border-color: var(--border-color) !important;
    color: var(--text-muted) !important;
}

[data-theme="dark"] .form-check-input {
    background-color: var(--bg-input) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .form-check-input:checked {
    background-color: var(--accent-primary) !important;
    border-color: var(--accent-primary) !important;
}

[data-theme="dark"] .form-check-label {
    color: var(--text-main) !important;
}

/* Dropdown Menu Dark Mode Support */
[data-theme="dark"] .dropdown-menu {
    background-color: var(--bg-card) !important;
    border-color: var(--border-color) !important;
    color: var(--text-main) !important;
}

[data-theme="dark"] .dropdown-item {
    color: var(--text-main) !important;
}

[data-theme="dark"] .dropdown-item:hover,
[data-theme="dark"] .dropdown-item:focus {
    background-color: var(--bg-input) !important;
    color: var(--accent-primary) !important;
}

[data-theme="dark"] .dropdown-divider {
    border-top-color: var(--border-color) !important;
}

/* Nav Tabs Dark Mode Support */
[data-theme="dark"] .nav-tabs {
    border-bottom-color: var(--border-color) !important;
}

[data-theme="dark"] .nav-tabs .nav-link {
    color: var(--text-muted) !important;
    border-color: transparent !important;
}

[data-theme="dark"] .nav-tabs .nav-link:hover {
    color: var(--accent-primary) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .nav-tabs .nav-link.active {
    background-color: var(--bg-card) !important;
    border-color: var(--border-color) var(--border-color) transparent !important;
    color: var(--accent-primary) !important;
    font-weight: 500;
    position: relative;
    box-shadow: 0 -2px 8px rgba(0, 243, 255, 0.1);
    border-radius: var(--radius-btn) var(--radius-btn) 0 0;
    border-bottom: 2px solid var(--accent-primary) !important;
    border-color: var(--border-color) !important;
    border-bottom-color: var(--bg-card) !important;
    color: var(--accent-primary) !important;
}

/* 深色模式下的二级导航栏 - 简洁风格 */
[data-theme="dark"] .card-header-tabs {
    background-color: transparent !important;
    border-radius: 0;
    padding: 0;
    border: none;
    width: 100%;
    display: flex;
    flex-wrap: nowrap;
    gap: 0;
    box-shadow: none;
    margin-bottom: 0;
    backdrop-filter: none;
}

[data-theme="dark"] .card-header-tabs .nav-item {
    flex: 0 0 auto;
    margin: 0;
}

[data-theme="dark"] .card-header-tabs .nav-link {
    color: var(--text-muted) !important;
    border: 1px solid transparent !important;
    border-radius: var(--radius-btn) var(--radius-btn) 0 0 !important;
    padding: 0.75rem 1.5rem !important;
    transition: all var(--transition-speed) ease;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    background: transparent !important;
}

/* 深色模式悬停状态 */
[data-theme="dark"] .card-header-tabs .nav-link:hover {
    color: var(--accent-primary) !important;
    background-color: rgba(255, 255, 255, 0.05) !important;
    border-color: var(--border-color) !important;
}

/* 深色模式点击反馈效果 */
[data-theme="dark"] .card-header-tabs .nav-link:active {
    transform: none;
    box-shadow: none;
}

/* 深色模式焦点状态 */
[data-theme="dark"] .card-header-tabs .nav-link:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
    box-shadow: none;
}

/* 深色模式禁用状态 */
[data-theme="dark"] .card-header-tabs .nav-link.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: transparent !important;
    color: rgba(255, 255, 255, 0.3) !important;
}

/* 深色模式激活状态 */
[data-theme="dark"] .card-header-tabs .nav-link.active {
    background-color: var(--bg-card) !important;
    color: var(--accent-primary) !important;
    border: 1px solid var(--border-color) !important;
    border-bottom-color: var(--bg-card) !important;
    font-weight: 600;
    box-shadow: none;
    position: relative;
}

/* 深色模式激活状态底部指示器 */
[data-theme="dark"] .card-header-tabs .nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 2px;
    background-color: var(--accent-primary);
    border-radius: 1px;
}

/* Progress Bar Dark Mode Support */
[data-theme="dark"] .progress {
    background-color: var(--bg-input) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .progress-bar {
    background-color: var(--accent-primary) !important;
    color: #000 !important;
}

[data-theme="dark"] .progress-bar-success {
    background-color: #4cd964 !important;
}

[data-theme="dark"] .progress-bar-danger {
    background-color: #ff453a !important;
}

[data-theme="dark"] .progress-bar-warning {
    background-color: #ffcc00 !important;
}

[data-theme="dark"] .progress-bar-info {
    background-color: var(--accent-primary) !important;
}

/* Blockquote Dark Mode Support */
[data-theme="dark"] blockquote {
    border-left-color: var(--accent-primary) !important;
    color: var(--text-muted) !important;
}

[data-theme="dark"] blockquote footer {
    color: var(--text-muted) !important;
}

/* Code Dark Mode Support */
[data-theme="dark"] code {
    background-color: var(--bg-input) !important;
    color: #ffcc00 !important;
}

[data-theme="dark"] pre {
    background-color: var(--bg-input) !important;
    border-color: var(--border-color) !important;
    color: var(--text-main) !important;
}

[data-theme="dark"] pre code {
    background-color: transparent !important;
    color: inherit !important;
}

/* Background Utility Dark Mode Support */
[data-theme="dark"] .bg-light {
    background-color: var(--bg-input) !important;
    color: var(--text-main) !important;
}

[data-theme="dark"] .bg-dark {
    background-color: var(--bg-card) !important;
    color: var(--text-main) !important;
}

[data-theme="dark"] .bg-white {
    background-color: var(--bg-card) !important;
    color: var(--text-main) !important;
}

[data-theme="dark"] .bg-black {
    background-color: #000 !important;
    color: #fff !important;
}

[data-theme="dark"] .bg-transparent {
    background-color: transparent !important;
}

/* Text Utility Dark Mode Support */
[data-theme="dark"] .text-light {
    color: var(--text-main) !important;
}

[data-theme="dark"] .text-dark {
    color: var(--text-muted) !important;
}

[data-theme="dark"] .text-white {
    color: #fff !important;
}

[data-theme="dark"] .text-black {
    color: #000 !important;
}

[data-theme="dark"] .text-muted {
    color: var(--text-muted) !important;
}

/* Border Utility Dark Mode Support */
[data-theme="dark"] .border {
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .border-top {
    border-top-color: var(--border-color) !important;
}

[data-theme="dark"] .border-right {
    border-right-color: var(--border-color) !important;
}

[data-theme="dark"] .border-bottom {
    border-bottom-color: var(--border-color) !important;
}

[data-theme="dark"] .border-left {
    border-left-color: var(--border-color) !important;
}

[data-theme="dark"] .border-light {
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .border-dark {
    border-color: var(--accent-primary) !important;
}

/* Shadow Utility Dark Mode Support */
[data-theme="dark"] .shadow {
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.5) !important;
}

[data-theme="dark"] .shadow-sm {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.5) !important;
}

[data-theme="dark"] .shadow-lg {
    box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.5) !important;
}

[data-theme="dark"] .shadow-none {
    box-shadow: none !important;
}

/* Image Dark Mode Support */
[data-theme="dark"] .img-thumbnail {
    background-color: var(--bg-input) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .figure-caption {
    color: var(--text-muted) !important;
}

/* ================= Large Screen Optimizations ================= */
@media (min-width: 1200px) {
    .container {
        max-width: 1320px; /* Wider container for large screens */
    }
    
    /* Improve thread list readability on wide screens */
    .thread {
        padding: 24px 28px;
        margin-bottom: 16px;
    }
    
    .thread .subject {
        font-size: 1.15rem;
    }
    
    /* Better sidebar spacing */
    .aside {
        padding-left: 20px;
        padding-right: 20px;
    }
    
    /* Improve card layout for wide screens */
    .card {
        margin-bottom: 32px;
    }
    
    /* Enhance form controls for better usability */
    .form-control, .custom-select {
        padding: 10px 16px;
        font-size: 1rem;
    }
    
    textarea.form-control {
        min-height: 240px;
    }
    
    /* Improve button sizes for desktop */
    .btn {
        padding: 10px 24px;
        font-size: 1rem;
    }
}



/* ================= Sidebar Optimization ================= */
.aside {
    position: -webkit-sticky;
    position: sticky;
    top: 80px; /* Adjusted for better positioning */
    z-index: 10;
    align-self: flex-start !important;
    height: auto !important;
    max-height: calc(100vh - 100px); /* Better height calculation */
    overflow-y: auto;
    scrollbar-width: thin; /* Firefox */
    scrollbar-color: var(--border-color) transparent;
}

/* Custom scrollbar for sidebar */
.aside::-webkit-scrollbar {
    width: 6px;
}

.aside::-webkit-scrollbar-track {
    background: transparent;
}

.aside::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 3px;
}

.aside::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-muted);
}

/* ================= Improved Focus States ================= */
.btn:focus, .form-control:focus, .page-link:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--accent-glow) !important;
}

/* ================= Table Improvements ================= */
.table {
    border-collapse: separate;
    border-spacing: 0;
}

.table th {
    font-weight: 600;
    border-bottom: 2px solid var(--border-color) !important;
}

.table td {
    border-bottom: 1px solid var(--border-color) !important;
    padding: 12px 8px;
}

.table-hover tbody tr:hover {
    background-color: var(--bg-input) !important;
    transition: background-color 0.2s ease;
}
.table th, .table td {
    /* border-top: 1px solid var(--border-color) !important; Removed forced border */
    /* border-bottom: 1px solid var(--border-color) !important; Removed forced border */
}

.table thead th {
    /* border-bottom: 2px solid var(--border-color) !important; Removed forced border */
    /* color: var(--text-muted); Removed forced color */
}

.table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(0, 0, 0, 0.02) !important;
}

.table-hover tbody tr:hover {
    background-color: var(--bg-input) !important;
}

[data-theme="dark"] .table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(255, 255, 255, 0.03) !important;
}

/* Fix Bootstrap Text Colors for Dark Mode */
[data-theme="dark"] .text-success {
    color: #4cd964 !important; /* Brighter Green */
}

[data-theme="dark"] .text-danger {
    color: #ff453a !important; /* Brighter Red */
}

[data-theme="dark"] .text-muted {
    color: #98989d !important;
}