/* ============================================
   WALLS CSS - CSS VARIABLES SYSTEM (Updated 5% padding)
   ============================================
   Encyclopedia পেজের মত 3-column layout
   CSS Variables দিয়ে সহজে customize করা যাবে
   ============================================ */

:root {
    /* ========== Layout & Spacing ========== */
    --walls-container-padding: 20px;
    --walls-card-padding: 20px;
    --walls-gap: 20px;
    --walls-gap-sm: 15px;
    --walls-gap-xs: 10px;
    
    /* ========== Grid Layout ========== */
    --walls-sidebar-left-width: 20%;
    --walls-main-content-width: 55%;
    --walls-sidebar-right-width: 20%;
    --walls-max-width: 1400px;
    
    /* ========== Colors ========== */
    --walls-bg: #f0f2f5;
    --walls-card-bg: #ffffff;
    --walls-border-color: #e4e6eb;
    --walls-text-primary: #1c1e21;
    --walls-text-secondary: #65676b;
    --walls-text-muted: #bcc0c4;
    
    /* Primary Colors */
    --walls-primary: #1877f2;
    --walls-primary-hover: #166fe5;
    --walls-primary-light: #e7f3ff;
    
    /* Status Colors */
    --walls-success: #27ae60;
    --walls-warning: #f39c12;
    --walls-danger: #e74c3c;
    --walls-info: #3498db;
    
    /* Active State */
    --walls-active-bg: #e7f3ff;
    --walls-active-text: #1877f2;
    --walls-active-border: #1877f2;
    
    /* ========== Border Radius ========== */
    --walls-radius: 12px;
    --walls-radius-lg: 16px;
    --walls-radius-md: 10px;
    --walls-radius-sm: 8px;
    --walls-radius-xs: 6px;
    
    /* ========== Shadows ========== */
    --walls-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --walls-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
    --walls-shadow-lg: 0 6px 16px rgba(0, 0, 0, 0.15);
    --walls-shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.15);
    
    /* ========== Typography ========== */
    --walls-font-family: 'Noto Sans Bengali', 'Hind Siliguri', 'Kalpurush', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --walls-font-size-base: 1rem;
    --walls-font-size-xxl: 2rem;
    --walls-font-size-xl: 1.5rem;
    --walls-font-size-lg: 1.25rem;
    --walls-font-size-md: 1.125rem;
    --walls-font-size-sm: 0.875rem;
    --walls-font-size-xs: 0.75rem;
    
    --walls-font-weight-normal: 400;
    --walls-font-weight-medium: 500;
    --walls-font-weight-semibold: 600;
    --walls-font-weight-bold: 700;
    
    --walls-line-height-base: 1.5;
    --walls-line-height-tight: 1.25;
    --walls-line-height-relaxed: 1.75;
    
    /* ========== Transitions ========== */
    --walls-transition-fast: 0.15s ease;
    --walls-transition-base: 0.2s ease;
    --walls-transition-slow: 0.3s ease;
    
    /* ========== Z-Index ========== */
    --walls-z-dropdown: 1000;
    --walls-z-sticky: 1020;
    --walls-z-fixed: 1030;
    --walls-z-modal: 1050;
    --walls-z-floating: 1100;
}

/* ============================================
   Global Bangla Font Support
   ============================================ */
* {
    font-family: var(--walls-font-family);
}

.bangla-text {
    font-family: var(--walls-font-family);
}

/* ============================================
   Layout Structure (3-Column Grid)
   ============================================ */

body {
    background-color: var(--walls-bg);
}

.walls-container {
    max-width: 100%;
    margin: 0;
    padding: 20px 5%;
}

.walls-grid {
    display: grid;
    grid-template-columns: 280px 1fr;  /* 2 columns: left sidebar + expanded main content */
    gap: 20px;
    align-items: start;
    max-width: var(--walls-max-width);
    margin: 0 auto;
}

/* ============================================
   Card Styling
   ============================================ */

.walls-card {
    background: var(--walls-card-bg);
    border-radius: var(--walls-radius);
    box-shadow: var(--walls-shadow);
    padding: var(--walls-card-padding-top) var(--walls-card-padding-right) var(--walls-card-padding-bottom) var(--walls-card-padding-left);
    margin-bottom: var(--walls-gap);
    transition: box-shadow var(--walls-transition-base);
}

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

.walls-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: var(--walls-card-padding-top);
    border-bottom: 2px solid var(--walls-border-color);
    margin-bottom: var(--walls-card-padding-top);
}

.walls-card-title {
    font-size: var(--walls-font-size-lg);
    font-weight: var(--walls-font-weight-bold);
    color: var(--walls-text-primary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--walls-gap-xs);
}

.walls-card-title i {
    color: var(--walls-primary);
}

.walls-card-body {
    padding: 0;
}

/* ============================================
   Sidebar Styling
   ============================================ */

.walls-sidebar {
    position: sticky;
    top: 80px;
    padding: 0;
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: var(--walls-gap-xs);
    margin-bottom: var(--walls-gap);
}

.sidebar-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--walls-primary) 0%, var(--walls-primary-hover) 100%);
    border-radius: var(--walls-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--walls-font-size-lg);
}

.sidebar-title {
    font-size: var(--walls-font-size-lg);
    font-weight: var(--walls-font-weight-bold);
    color: var(--walls-text-primary);
    margin: 0;
}

/* Sidebar Menu */
.sidebar-menu {
    list-style: none;
    padding: 0 20px 20px 20px;
    margin: 0;
}

.sidebar-menu li {
    margin-bottom: 4px;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: 8px;
    color: #050505;
    text-decoration: none;
    transition: all 0.2s ease;
    font-weight: 500;
    font-size: 15px;
}

.sidebar-menu a:hover {
    background: #f0f2f5;
    color: #1877f2;
}

.sidebar-menu li.active a {
    background: #e7f3ff;
    color: #1877f2;
    font-weight: 600;
}

.sidebar-menu i {
    font-size: 20px;
    width: 24px;
    text-align: center;
    color: inherit;
}

/* ============================================
   Header Section
   ============================================ */

.walls-header {
    text-align: center;
    margin-bottom: var(--walls-gap);
    background: var(--walls-card-bg);
    border-radius: var(--walls-radius);
    box-shadow: var(--walls-shadow);
    padding: var(--walls-card-padding-top);
}

.header-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--walls-primary) 0%, var(--walls-primary-hover) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    margin: 0 auto var(--walls-gap-sm);
}

.header-title {
    font-size: var(--walls-font-size-xxl);
    font-weight: var(--walls-font-weight-bold);
    color: var(--walls-text-primary);
    margin-bottom: var(--walls-gap-xs);
}

.header-subtitle {
    color: var(--walls-text-secondary);
    font-size: var(--walls-font-size-base);
    margin: 0;
}

/* ============================================
   Quick Navigation Box
   ============================================ */

.quick-nav-box {
    background: var(--walls-card-bg);
    border-radius: var(--walls-radius);
    box-shadow: var(--walls-shadow);
    padding: var(--walls-card-padding-top);
    margin-bottom: var(--walls-gap);
    display: flex;
    gap: var(--walls-gap-xs);
    flex-wrap: wrap;
}

.quick-nav-link {
    flex: 1;
    min-width: 120px;
    padding: var(--walls-card-padding-top);
    background: var(--walls-bg);
    border-radius: var(--walls-radius-sm);
    text-align: center;
    text-decoration: none;
    color: var(--walls-text-primary);
    font-weight: var(--walls-font-weight-medium);
    transition: all var(--walls-transition-base);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--walls-gap-xs);
}

.quick-nav-link:hover {
    background: var(--walls-active-bg);
    color: var(--walls-active-text);
    transform: translateY(-2px);
}

.quick-nav-link i {
    font-size: var(--walls-font-size-lg);
}

/* ============================================
   Statistics Cards
   ============================================ */

.walls-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--walls-gap);
    margin-bottom: var(--walls-gap);
}

.stat-card {
    background: var(--walls-card-bg);
    border-radius: var(--walls-radius);
    padding: var(--walls-card-padding-top);
    box-shadow: var(--walls-shadow);
    text-align: center;
    transition: all var(--walls-transition-base);
}

.stat-card:hover {
    box-shadow: var(--walls-shadow-hover);
    transform: translateY(-2px);
}

.stat-card h3 {
    font-size: var(--walls-font-size-xxl);
    font-weight: var(--walls-font-weight-bold);
    color: var(--walls-primary);
    margin: 0 0 var(--walls-gap-xs) 0;
}

.stat-card p {
    color: var(--walls-text-secondary);
    font-size: var(--walls-font-size-sm);
    margin: 0;
}

/* ============================================
   Posts Grid
   ============================================ */

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--walls-gap);
}

.post-card {
    background: var(--walls-card-bg);
    border-radius: var(--walls-radius);
    box-shadow: var(--walls-shadow);
    overflow: hidden;
    transition: all var(--walls-transition-base);
    cursor: pointer;
}

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

.post-header {
    display: flex;
    align-items: center;
    gap: var(--walls-gap-xs);
    padding: var(--walls-card-padding-top);
    border-bottom: 1px solid var(--walls-border-color);
}

.post-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.post-author-info h4 {
    font-size: var(--walls-font-size-sm);
    font-weight: var(--walls-font-weight-semibold);
    color: var(--walls-text-primary);
    margin: 0;
}

.post-date {
    font-size: var(--walls-font-size-xs);
    color: var(--walls-text-muted);
}

.post-media {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.post-content {
    padding: var(--walls-card-padding-top);
}

.post-title {
    font-size: var(--walls-font-size-md);
    font-weight: var(--walls-font-weight-semibold);
    color: var(--walls-text-primary);
    margin-bottom: var(--walls-gap-xs);
}

.post-text {
    font-size: var(--walls-font-size-sm);
    color: var(--walls-text-secondary);
    line-height: var(--walls-line-height-relaxed);
}

.post-footer {
    display: flex;
    justify-content: space-around;
    padding: var(--walls-card-padding-top);
    border-top: 1px solid var(--walls-border-color);
}

.post-action {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--walls-text-secondary);
    font-size: var(--walls-font-size-sm);
}

.post-action i {
    font-size: var(--walls-font-size-base);
}

/* ============================================
   Pagination
   ============================================ */

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--walls-gap);
    margin-top: var(--walls-gap);
    padding: var(--walls-card-padding-top);
    background: var(--walls-card-bg);
    border-radius: var(--walls-radius);
    box-shadow: var(--walls-shadow);
}

.pagination a {
    padding: calc(var(--walls-card-padding-top) * 0.7) var(--walls-card-padding-right);
    background: var(--walls-primary);
    color: white;
    border-radius: var(--walls-radius-sm);
    text-decoration: none;
    font-weight: var(--walls-font-weight-semibold);
    transition: all var(--walls-transition-base);
}

.pagination a:hover {
    background: var(--walls-primary-hover);
    transform: translateY(-2px);
}

.pagination .current {
    color: var(--walls-text-secondary);
    font-weight: var(--walls-font-weight-medium);
}

/* ============================================
   Empty State
   ============================================ */

.empty-state {
    text-align: center;
    padding: 60px 20px;
    background: var(--walls-card-bg);
    border-radius: var(--walls-radius);
    box-shadow: var(--walls-shadow);
}

.empty-state i {
    font-size: 4rem;
    color: var(--walls-text-muted);
    margin-bottom: var(--walls-gap);
}

.empty-state h2 {
    font-size: var(--walls-font-size-xl);
    color: var(--walls-text-primary);
    margin-bottom: var(--walls-gap-xs);
}

.empty-state p {
    color: var(--walls-text-secondary);
    font-size: var(--walls-font-size-base);
}

/* ============================================
   Floating Action Button
   ============================================ */

.walls-fab {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--walls-primary) 0%, var(--walls-primary-hover) 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: var(--walls-shadow-lg);
    text-decoration: none;
    z-index: var(--walls-z-floating);
    transition: all var(--walls-transition-slow);
}

.walls-fab:hover {
    transform: scale(1.1) rotate(90deg);
    box-shadow: 0 8px 24px rgba(24, 119, 242, 0.4);
}

/* ============================================
   Buttons
   ============================================ */

.walls-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--walls-gap-xs);
    padding: var(--walls-card-padding-top) calc(var(--walls-card-padding-right) * 1.5);
    border-radius: var(--walls-radius-sm);
    font-weight: var(--walls-font-weight-semibold);
    text-decoration: none;
    transition: all var(--walls-transition-base);
    cursor: pointer;
    border: none;
}

.walls-btn-primary {
    background: var(--walls-primary);
    color: white;
}

.walls-btn-primary:hover {
    background: var(--walls-primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--walls-shadow-md);
}

.walls-btn-light {
    background: white;
    color: var(--walls-primary);
}

.walls-btn-light:hover {
    background: var(--walls-bg);
}

.walls-btn-sm {
    padding: calc(var(--walls-card-padding-top) * 0.7) var(--walls-card-padding-right);
    font-size: var(--walls-font-size-sm);
}

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

@media (max-width: 1200px) {
    .walls-grid {
        grid-template-columns: 250px 1fr;
    }
}

@media (max-width: 992px) {
    .walls-grid {
        grid-template-columns: 1fr;
    }
    
    .walls-sidebar {
        display: none;
    }
}

@media (max-width: 768px) {
    :root {
        --walls-container-padding-top: 15px;
        --walls-container-padding-bottom: 15px;
        --walls-card-padding-top: 2%;
        --walls-card-padding-right: 2%;
        --walls-card-padding-bottom: 2%;
        --walls-card-padding-left: 2%;
        --walls-gap: 1.5%;
    }
    
    .header-title {
        font-size: var(--walls-font-size-xl);
    }
    
    .walls-fab {
        width: 50px;
        height: 50px;
        bottom: 20px;
        right: 20px;
        font-size: 1.25rem;
    }
    
    .posts-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    :root {
        --walls-container-padding-top: 10px;
        --walls-container-padding-bottom: 10px;
        --walls-card-padding-top: 3%;
        --walls-card-padding-right: 3%;
        --walls-card-padding-bottom: 3%;
        --walls-card-padding-left: 3%;
    }
}

/* ============================================
   Utility Classes
   ============================================ */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.d-flex { display: flex; }
.d-block { display: block; }
.d-none { display: none; }

.align-items-center { align-items: center; }
.justify-content-center { justify-content: center; }
.justify-content-between { justify-content: space-between; }

.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }

.w-100 { width: 100%; }

/* ============================================
   Custom Scrollbar
   ============================================ */

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--walls-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--walls-border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--walls-text-muted);
}