/* ==========================================================
   KUETx - Design System & Stylesheet
   ========================================================== */

:root {
    /* Brand Colors */
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #e0e7ff;
    --primary-glow: rgba(79, 70, 229, 0.25);

    --accent: #06b6d4;
    --accent-pink: #ec4899;
    --accent-amber: #f59e0b;
    --accent-emerald: #10b981;
    --accent-rose: #f43f5e;

    /* Neutrals (Light Mode Default) */
    --bg-main: #f1f5f9;
    --bg-card: #ffffff;
    --bg-hover: #f8fafc;
    --bg-tertiary: #e2e8f0;
    --border-color: #e2e8f0;
    --border-focus: #818cf8;

    --text-main: #0f172a;
    --text-muted: #64748b;
    --text-subtle: #94a3b8;
    --text-on-primary: #ffffff;

    /* Elevation & Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    --shadow-floating: 0 12px 30px rgba(15, 23, 42, 0.15);

    /* Radii */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.2s ease;
    --transition-spring: 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Layout Dimensions */
    --header-height: 64px;
    --mobile-nav-height: 60px;
    --max-width: 1240px;
}

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

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

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

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

button, input, textarea, select {
    font: inherit;
    color: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    outline: none;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 16px;
}

/* Top Navbar */
.app-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    height: var(--header-height);
    display: flex;
    align-items: center;
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    gap: 16px;
}

.brand-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.brand-logo {
    height: 36px;
    width: auto;
    max-width: 150px;
    object-fit: contain;
    vertical-align: middle;
}

/* Light / Dark Mode Dynamic Logo Switcher */
.logo-dark {
    display: none !important;
}
.logo-light {
    display: inline-block !important;
}

[data-theme="dark"] .logo-light {
    display: none !important;
}
[data-theme="dark"] .logo-dark {
    display: inline-block !important;
}

/* Global Search Bar */
.search-wrapper {
    position: relative;
    flex: 1;
    max-width: 460px;
}

.search-form {
    width: 100%;
    margin: 0;
}

.search-input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.search-btn,
.search-icon {
    position: absolute;
    left: 8px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 16px;
    padding: 6px 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-subtle);
    border-radius: var(--radius-full);
    transition: transform var(--transition-fast), color var(--transition-fast);
    z-index: 2;
}

.search-btn:hover {
    color: var(--primary);
    transform: scale(1.15);
}

.search-btn:active {
    transform: scale(0.95);
}

.search-input {
    width: 100%;
    padding: 9px 16px 9px 40px;
    background-color: var(--bg-hover);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}


.search-input:focus {
    outline: none;
    background-color: var(--bg-card);
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

/* Live Search Dropdown */
.search-suggestions {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-floating);
    max-height: 420px;
    overflow-y: auto;
    z-index: 1100;
    display: none;
}

.search-suggestion-section {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.search-suggestion-section:last-child {
    border-bottom: none;
}

.search-suggestion-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    padding: 4px 16px;
}

.search-suggestion-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 16px;
    color: var(--text-main);
    transition: background-color var(--transition-fast);
}

.search-suggestion-item:hover,
.search-suggestion-item.active-search-item,
.search-view-all-link.active-search-item {
    background-color: var(--bg-hover);
    color: var(--primary);
}

/* Nav Actions */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--bg-hover);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    font-size: 1.1rem;
    position: relative;
    transition: all var(--transition-fast);
}

.icon-btn:hover {
    background: var(--bg-tertiary);
    transform: translateY(-1px);
}

.badge-counter {
    position: absolute;
    top: -2px;
    right: -2px;
    background: var(--accent-rose);
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
    min-width: 18px;
    height: 18px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 4px;
}

/* User Menu Trigger */
.user-menu-avatar {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-full);
    object-fit: cover;
    border: 2px solid var(--primary-light);
    display: block;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 18px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.92rem;
    transition: all var(--transition-fast);
    text-align: center;
    white-space: nowrap;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background-color: var(--primary);
    color: var(--text-on-primary);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    color: var(--text-on-primary);
    box-shadow: 0 4px 12px var(--primary-glow);
}

.btn-secondary {
    background-color: var(--bg-hover);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

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

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

.btn-outline:hover {
    background: var(--primary-light);
}

.btn-danger {
    background-color: var(--accent-rose);
    color: white;
}

.btn-danger:hover {
    background-color: #e11d48;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.82rem;
    border-radius: var(--radius-sm);
}

.btn-block {
    width: 100%;
}

/* App Main Layout Grid (Desktop 3-Column) */
.app-layout {
    display: grid;
    grid-template-columns: 240px minmax(0, 1fr) 320px;
    gap: 24px;
    padding: 24px 0;
    align-items: start;
}

/* Left Sidebar */
.left-sidebar {
    position: sticky;
    top: calc(var(--header-height) + 24px);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar-nav-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    color: var(--text-main);
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}

.sidebar-nav-item:hover {
    background-color: var(--bg-card);
    color: var(--primary);
    transform: translateX(3px);
}

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

.sidebar-nav-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.sidebar-nav-icon svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    transition: transform var(--transition-fast);
}

.sidebar-nav-item:hover .sidebar-nav-icon svg {
    transform: scale(1.12);
}

/* Center Feed */
.center-feed {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Right Sidebar */
.right-sidebar {
    position: sticky;
    top: calc(var(--header-height) + 24px);
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.sidebar-widget {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 18px;
    box-shadow: var(--shadow-sm);
}

.widget-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.widget-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

.widget-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

/* Post Composer — Facebook-Style Collapsible with Spring Animation */
.post-composer-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 14px 18px;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1),
                border-color 0.3s cubic-bezier(0.16, 1, 0.3, 1),
                padding 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.post-composer-card:hover {
    border-color: var(--border-color-hover, #cbd5e1);
}

.post-composer-card.is-expanded {
    padding: 18px 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08), 0 0 0 1px var(--primary-light);
    border-color: var(--primary);
}

.composer-top {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.composer-avatar {
    width: 42px;
    height: 42px;
    border-radius: var(--radius-full);
    object-fit: cover;
    flex-shrink: 0;
    transition: transform 0.25s ease;
}

.post-composer-card.is-expanded .composer-avatar {
    transform: scale(1.05);
}

.composer-textarea-wrap {
    flex: 1;
    min-width: 0;
}

.composer-textarea {
    width: 100%;
    min-height: 42px;
    height: 42px;
    background: var(--bg-hover);
    border: 1px solid transparent;
    border-radius: 22px;
    padding: 10px 16px;
    outline: none;
    resize: none;
    font-size: 0.95rem;
    line-height: 1.4;
    color: var(--text-main);
    font-family: inherit;
    cursor: pointer;
    box-sizing: border-box;
    transition: height 0.32s cubic-bezier(0.16, 1, 0.3, 1), 
                min-height 0.32s cubic-bezier(0.16, 1, 0.3, 1),
                background 0.2s ease,
                border-radius 0.2s ease,
                padding 0.2s ease;
}

.composer-textarea:hover {
    background: var(--bg-tertiary);
}

.post-composer-card.is-expanded .composer-textarea {
    min-height: 95px;
    height: 95px;
    background: transparent;
    border-radius: var(--radius-md);
    padding: 4px 4px 6px 0;
    font-size: 1.05rem;
    cursor: text;
}

.post-composer-card.is-expanded .composer-textarea:hover {
    background: transparent;
}

.composer-textarea::placeholder {
    color: var(--text-muted);
    transition: color 0.2s ease;
}

/* Image Previews inside Composer */
.composer-image-previews {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 10px 0 4px 0;
}

.preview-thumb-wrap {
    position: relative;
    width: 80px;
    height: 80px;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
    animation: kuetxPopIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.preview-thumb-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.preview-remove-btn {
    position: absolute;
    top: 4px;
    right: 4px;
    background: rgba(15, 23, 42, 0.75);
    color: white;
    width: 22px;
    height: 22px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    backdrop-filter: blur(4px);
    transition: background var(--transition-fast);
}

.preview-remove-btn:hover {
    background: var(--accent-rose);
}

/* Composer Bottom Toolbar — Animated reveal when expanded */
.composer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    padding-top: 0;
    border-top: 1px solid transparent;
    transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1),
                opacity 0.25s ease,
                margin-top 0.3s ease,
                padding-top 0.3s ease,
                border-color 0.3s ease;
    pointer-events: none;
}

.post-composer-card.is-expanded .composer-bottom {
    max-height: 80px;
    opacity: 1;
    margin-top: 12px;
    padding-top: 12px;
    border-top-color: var(--border-color);
    overflow: visible;
    pointer-events: auto;
}

.composer-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.attach-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: var(--radius-md);
    background: var(--bg-hover);
    color: var(--text-muted);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.attach-btn:hover {
    background: var(--bg-tertiary);
    color: var(--primary);
    transform: translateY(-1px);
}

.char-counter {
    font-size: 0.8rem;
    color: var(--text-subtle);
    margin-right: 12px;
}

/* Post Card */
.post-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
}

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

.post-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.post-author-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
}

.author-avatar {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    object-fit: cover;
    flex-shrink: 0;
}

.author-meta {
    display: flex;
    flex-direction: column;
}

.author-name-row {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-main);
}

.badge-tag {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 2px 7px;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    color: var(--text-muted);
}

.badge-anon {
    background: #e2e8f0;
    color: #475569;
}

.badge-admin {
    background: #fee2e2;
    color: #dc2626;
}

.author-sub {
    font-size: 0.8rem;
    color: var(--text-subtle);
}

.post-content {
    font-size: 0.98rem;
    line-height: 1.6;
    color: var(--text-main);
    word-break: break-word;
    margin-bottom: 14px;
    white-space: pre-line;
}

/* Multi-Image Grid */
.post-gallery {
    display: grid;
    gap: 6px;
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 14px;
    cursor: pointer;
}

.post-gallery.grid-1 {
    grid-template-columns: 1fr;
    max-height: 480px;
}

.post-gallery.grid-2 {
    grid-template-columns: 1fr 1fr;
    max-height: 360px;
}

.post-gallery.grid-3 {
    grid-template-columns: 2fr 1fr;
    grid-template-rows: 180px 180px;
}

.post-gallery.grid-3 .gallery-item:first-child {
    grid-row: span 2;
}

.post-gallery.grid-4 {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 170px 170px;
}

.post-gallery.grid-5 {
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: 160px 160px;
}

.post-gallery.grid-5 .gallery-item:first-child {
    grid-column: span 2;
}

.gallery-item {
    position: relative;
    overflow: hidden;
    height: 100%;
    min-height: 160px;
    background: var(--bg-tertiary);
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-base);
}

.gallery-item:hover img {
    transform: scale(1.03);
}

/* Post Stats Summary Row */
.post-stats-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.84rem;
    color: var(--text-muted);
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.stats-reactions {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Post Header Dropdown Menu (Facebook-style) */
.post-menu-wrap {
    position: relative;
}

.post-menu-dropdown {
    display: none;
    position: absolute;
    right: 0;
    top: calc(100% + 4px);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.12), 0 2px 6px rgba(0, 0, 0, 0.06);
    z-index: 200;
    min-width: 180px;
    padding: 4px 0;
    animation: kuetxBounceIn 0.2s ease;
}

.post-menu-action-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 9px 16px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-main);
    background: transparent;
    border: none;
    cursor: pointer;
    text-align: left;
    transition: background-color var(--transition-fast);
}

.post-menu-action-btn:hover {
    background-color: var(--bg-hover);
}

.post-edit-box {
    animation: kuetxFadeIn 0.2s ease;
}

.composer-audience-btn:hover {
    background-color: var(--bg-tertiary) !important;
    border-color: var(--border-hover) !important;
}

.composer-audience-menu {
    animation: kuetxBounceIn 0.2s ease;
}

.audience-option-btn {
    transition: background-color var(--transition-fast);
}

.audience-option-btn:hover {
    background-color: var(--bg-hover) !important;
}

/* Action Buttons (React, Comment, Share) */
.post-actions-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 8px;
    padding-top: 8px;
    position: relative;
}

.action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: var(--radius-md);
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 600;
    transition: all var(--transition-fast);
    position: relative;
    user-select: none;
    -webkit-user-select: none;
    touch-action: manipulation;
}

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

.action-btn svg {
    width: 18px;
    height: 18px;
    stroke: currentColor;
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.action-btn:hover svg {
    transform: scale(1.12);
}

.action-btn.active-reacted {
    color: var(--primary);
    background-color: var(--primary-light);
}

/* Floating Reaction Picker Bubble (Facebook-style) */
.reaction-picker-container {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 4px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: 4px 10px;
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.15), 0 2px 8px rgba(0, 0, 0, 0.08);
    display: flex;
    align-items: center;
    gap: 4px;
    z-index: 500;
    transform-origin: bottom left;
    animation: reactionBubblePop 0.25s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* Invisible bridge so mouse hover doesn't break when moving between button and bubble */
.reaction-picker-container::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 14px;
}

.reaction-option-btn {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    padding: 6px 6px;
    border-radius: var(--radius-full);
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
    animation: reactionOptionPop 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

.reaction-option-btn:nth-child(1) { animation-delay: 0.02s; }
.reaction-option-btn:nth-child(2) { animation-delay: 0.06s; }
.reaction-option-btn:nth-child(3) { animation-delay: 0.10s; }
.reaction-option-btn:nth-child(4) { animation-delay: 0.14s; }
.reaction-option-btn:nth-child(5) { animation-delay: 0.18s; }
.reaction-option-btn:nth-child(6) { animation-delay: 0.22s; }

.reaction-emoji {
    font-size: 1.85rem;
    line-height: 1;
    display: inline-block;
    transform-origin: bottom center;
    transition: transform 0.18s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.reaction-option-btn:hover .reaction-emoji {
    transform: scale(1.45) translateY(-6px);
}

.reaction-option-btn .reaction-label {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translate(-50%, 4px);
    background: rgba(15, 23, 42, 0.92);
    color: #ffffff;
    padding: 3px 8px;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 700;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
    transition: opacity 0.15s ease, transform 0.15s ease;
}

.reaction-option-btn:hover .reaction-label {
    opacity: 1;
    transform: translate(-50%, 0);
    animation: reactionTooltipPop 0.18s ease-out forwards;
}

/* Comments Section */
.post-comments-container {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.comment-input-row {
    display: flex;
    gap: 10px;
}

.comment-input-wrap {
    flex: 1;
    display: flex;
    align-items: center;
    background: var(--bg-hover);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: 4px 14px;
}

.comment-input {
    width: 100%;
    border: none;
    background: transparent;
    outline: none;
    font-size: 0.88rem;
    padding: 6px 0;
}

.comment-submit-btn {
    color: var(--primary);
    font-size: 1.1rem;
    padding: 4px;
    transition: transform var(--transition-fast);
}

.comment-submit-btn:hover {
    transform: scale(1.1);
}

.comment-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.comment-item {
    display: flex;
    gap: 10px;
}

.comment-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    object-fit: cover;
    flex-shrink: 0;
}

.comment-bubble {
    background: var(--bg-hover);
    padding: 8px 14px;
    border-radius: 14px;
    max-width: 90%;
}

.comment-author-row {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.82rem;
    font-weight: 700;
    margin-bottom: 2px;
}

.comment-text {
    font-size: 0.88rem;
    color: var(--text-main);
    word-break: break-word;
}

.comment-time {
    font-size: 0.75rem;
    color: var(--text-subtle);
    font-weight: 400;
}

/* In-Feed Advertisement Box */
.feed-ad-card {
    background: var(--bg-card);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 16px;
    box-shadow: var(--shadow-sm);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.ad-badge {
    position: absolute;
    top: 6px;
    right: 10px;
    font-size: 0.68rem;
    color: var(--text-subtle);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.feed-ad-inner {
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: 100%;
}

/* Lightbox Modal */
.kuetx-lightbox {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.92);
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.kuetx-lightbox.active {
    opacity: 1;
    pointer-events: auto;
}

.lightbox-img-wrap {
    max-width: 90vw;
    max-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-img-wrap img {
    max-width: 100%;
    max-height: 85vh;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

.lightbox-btn {
    position: absolute;
    background: rgba(255, 255, 255, 0.15);
    color: white;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    transition: background var(--transition-fast);
}

.lightbox-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.lightbox-close {
    top: 20px;
    right: 20px;
}

.lightbox-prev {
    left: 20px;
}

.lightbox-next {
    right: 20px;
}

.lightbox-counter {
    position: absolute;
    bottom: 24px;
    color: white;
    font-size: 0.9rem;
    font-weight: 600;
    background: rgba(0, 0, 0, 0.5);
    padding: 4px 12px;
    border-radius: var(--radius-full);
}

/* Teacher Directory Cards */
.teachers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.teacher-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

.teacher-avatar-large {
    width: 68px;
    height: 68px;
    border-radius: var(--radius-full);
    object-fit: cover;
    margin-bottom: 12px;
    border: 3px solid var(--primary-light);
}

.star-rating {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    color: #f59e0b;
}

/* Toast Container */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background: var(--text-main);
    color: var(--bg-card);
    padding: 12px 20px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    font-size: 0.9rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: kuetxSlideUp 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

.toast.toast-success {
    background: #065f46;
    color: #ecfdf5;
}

.toast.toast-error {
    background: #991b1b;
    color: #fef2f2;
}

/* Mobile Bottom Navigation */
.mobile-bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--mobile-nav-height);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--border-color);
    z-index: 999;
    justify-content: space-around;
    align-items: center;
}

.mobile-nav-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-muted);
}

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

.mobile-nav-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 2px;
}

.mobile-nav-icon svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
}

/* Footer */
.app-footer {
    margin-top: auto;
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: 24px 0;
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
}

.footer-disclaimer {
    max-width: 680px;
    margin: 8px auto 0;
    font-size: 0.78rem;
    color: var(--text-subtle);
    line-height: 1.4;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
    .app-layout {
        grid-template-columns: 200px minmax(0, 1fr);
    }
    .right-sidebar {
        display: none;
    }
}

@media (max-width: 768px) {
    .app-layout {
        grid-template-columns: 1fr;
        padding: 12px 0 calc(var(--mobile-nav-height) + 16px) 0;
    }
    .left-sidebar {
        display: none;
    }
    .mobile-bottom-nav {
        display: flex;
    }
    .search-wrapper {
        display: none; /* Accessible via mobile search tab */
    }
    .composer-bottom {
        flex-wrap: wrap;
        gap: 10px;
    }
}

/* ==========================================================
   KUETx Form & Input System (Light & Base)
   ========================================================== */
.form-group {
    margin-bottom: 18px;
    text-align: left;
}

.form-label {
    display: block;
    font-size: 0.86rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 7px;
    letter-spacing: -0.01em;
}

.form-control {
    width: 100%;
    padding: 11px 14px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-hover);
    color: var(--text-main);
    border-radius: var(--radius-md);
    font-size: 0.92rem;
    font-family: inherit;
    line-height: 1.5;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
    box-sizing: border-box;
}

.form-control::placeholder {
    color: var(--text-subtle);
    opacity: 0.85;
}

.form-control:focus {
    outline: none;
    background-color: var(--bg-card);
    border-color: var(--primary);
    box-shadow: 0 0 0 3.5px var(--primary-glow);
    color: var(--text-main);
}

.form-control:disabled,
.form-control[readonly] {
    background-color: var(--bg-tertiary);
    cursor: not-allowed;
    opacity: 0.75;
}

select.form-control {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    background-size: 16px;
    padding-right: 40px;
    cursor: pointer;
}

select.form-control option {
    background-color: var(--bg-card);
    color: var(--text-main);
    padding: 8px;
}

textarea.form-control {
    resize: vertical;
    min-height: 85px;
}

input[type="file"].form-control {
    padding: 8px 12px;
    cursor: pointer;
    font-size: 0.86rem;
}

input[type="file"]::file-selector-button {
    padding: 6px 14px;
    background-color: var(--bg-card);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.82rem;
    cursor: pointer;
    margin-right: 12px;
    transition: background-color 0.15s ease;
}

input[type="file"]::file-selector-button:hover {
    background-color: var(--bg-hover);
}

.form-checkbox-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
    user-select: none;
    margin-top: 4px;
}

.form-checkbox {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
    cursor: pointer;
    border-radius: 4px;
}

/* ==========================================================
   KUETx Professional Modal Component System
   ========================================================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.72);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    z-index: 2500;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    animation: kuetxFadeIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    overflow: hidden;
}

.modal-dialog {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(255, 255, 255, 0.05);
    width: 100%;
    max-width: 520px;
    max-height: calc(100vh - 40px);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    animation: kuetxPopIn 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-dialog form {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
    overflow: hidden;
    margin: 0;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-card);
    flex-shrink: 0;
}

.modal-title {
    font-size: 1.18rem;
    font-weight: 700;
    color: var(--text-main);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.modal-close-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    background-color: var(--bg-hover);
    color: var(--text-muted);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    line-height: 1;
    transition: all 0.2s ease;
}

.modal-close-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-main);
    transform: scale(1.05);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
    flex: 1 1 auto;
    min-height: 0;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
}

.modal-body::-webkit-scrollbar {
    width: 6px;
}
.modal-body::-webkit-scrollbar-track {
    background: transparent;
}
.modal-body::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 8px;
}
.modal-body::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-hover);
    flex-shrink: 0;
}