/* === CLEAN CHAT APP STYLES === */

/* CSS Variables */
:root {
    /* Modern Color Palette */
    --primary-color: #4A90E2;
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #4A90E2 100%);
    --primary-hover: #3a7bc8;
    --primary-hover-color: #3a7bc8;
    --primary-dark: #2d5f9e;
    --primary-light: #E8F0FE;
    --secondary-color: #6c757d;
    --accent-color: #667eea;
    --text-color: #1a202c;
    --text-light: #ffffff;
    --text-muted: #718096;
    --text-dark: #1a202c;
    --bg-color: #f7fafc;
    --background-color: #f7fafc;
    --surface-color: #ffffff;
    --border-color: #e2e8f0;
    --border-radius-sm: 4px;
    --success-color: #48bb78;
    --error-color: #f56565;
    --hover-color: #edf2f7;
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Border radius */
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 20px;
    
    /* Mobile specific */
    --mobile-header-height: 60px;
    --mobile-input-height: 50px;
    --mobile-touch-target: 44px;
    --mobile-bottom-bar-height: 60px;
    --mobile-font-size-base: 16px;
    --mobile-font-size-large: 18px;
    --mobile-spacing-xs: 4px;
    --mobile-spacing-sm: 8px;
    --mobile-spacing-md: 16px;
    --mobile-spacing-lg: 24px;
    --mobile-spacing-xl: 32px;
    --mobile-border-radius: 8px;
    
    /* Safe area insets for iOS */
    --safe-area-top: env(safe-area-inset-top, 0px);
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
    --safe-area-left: env(safe-area-inset-left, 0px);
    --safe-area-right: env(safe-area-inset-right, 0px);
}

/* Reset and base styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow: hidden; /* Prevent body scroll */
}

/* Container */
.chat-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--surface-color);
    overflow-y: auto; /* Allow scrolling the entire container */
}

/* Header */
.chat-header {
    height: var(--mobile-header-height);
    background: var(--primary-gradient);
    color: var(--text-light);
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-md);
    box-shadow: var(--shadow-lg);
    z-index: 100;
    position: relative;
    top: 0;
    backdrop-filter: blur(10px);
}

.header-main {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.header-logo {
    height: 30px;
    width: auto;
}

.header-user-info {
    font-size: 14px;
    text-align: center;
    flex: 1;
}

/* Hamburger menu button */
#toggle-sidebar-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: var(--text-light);
    font-size: 24px;
    cursor: pointer;
    padding: 8px;
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
    margin-right: 12px;
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

#toggle-sidebar-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

#toggle-sidebar-btn:active {
    transform: translateY(0);
}

/* Header actions - hide on mobile */
.header-actions {
    display: none;
}

/* Visibility classes */
@media (max-width: 900px) {
    .desktop-only {
        display: none !important;
    }
    
    .mobile-only {
        display: block !important;
    }
    
    /* Ensure header actions are hidden on mobile */
    .header-actions {
        display: none !important;
    }
    
    /* Move logo to right on mobile */
    .header-main {
        justify-content: space-between;
        width: 100%;
    }
    
    .header-logo {
        order: 2;
        margin-left: auto;
    }
    
    #toggle-sidebar-btn {
        order: 1;
    }
}

@media (min-width: 901px) {
    .mobile-only {
        display: none !important;
    }
    
    .desktop-only {
        display: block !important;
    }
    
    /* Show header actions on desktop */
    .header-actions {
        display: flex !important;
        align-items: center;
        gap: var(--spacing-sm);
    }
    
    .header-user-info {
        text-align: right;
        flex: none;
    }
}

/* Main content */
.main-content {
    flex: 1;
    display: flex;
    position: relative;
    height: calc(100vh - var(--mobile-header-height) - var(--mobile-bottom-bar-height));
    overflow: hidden;
}

@media (min-width: 901px) {
    .main-content {
        height: calc(100vh - var(--mobile-header-height));
    }
}

/* Chat area */
.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0; /* Prevent overflow issues in flex */
    background: var(--bg-color);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    height: 100%;
    position: relative;
}

/* Message list */
.message-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    background: linear-gradient(to bottom, #f7fafc 0%, #edf2f7 100%);
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
    position: relative;
}

.message-list::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20px 20px, rgba(74, 144, 226, 0.03) 1px, transparent 1px),
        radial-gradient(circle at 60px 60px, rgba(74, 144, 226, 0.03) 1px, transparent 1px);
    background-size: 80px 80px;
    background-position: 0 0, 40px 40px;
    pointer-events: none;
    z-index: 0;
}

.message-list > * {
    position: relative;
    z-index: 1;
}

/* Messages */
.message {
    margin-bottom: 20px;
    max-width: 75%;
    animation: fadeInUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.message.sent {
    margin-left: auto;
    background: var(--primary-gradient);
    color: var(--text-light);
    border-radius: 20px 20px 4px 20px;
    padding: 14px 18px;
    box-shadow: var(--shadow-md);
    position: relative;
}

.message.sent::before {
    content: '';
    position: absolute;
    bottom: 0;
    right: -8px;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 0 20px 10px;
    border-color: transparent transparent #4A90E2 transparent;
}

.message.received {
    margin-right: auto;
    background: white;
    color: var(--text-color);
    border-radius: 20px 20px 20px 4px;
    padding: 14px 18px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    position: relative;
}

.message.received::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: -8px;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 10px 20px 0;
    border-color: transparent white transparent transparent;
    filter: drop-shadow(-1px 1px 0px var(--border-color));
}

.message .sender {
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 6px;
    opacity: 0.9;
    letter-spacing: 0.3px;
}

.message.sent .sender {
    color: rgba(255, 255, 255, 0.95);
}

.message .content {
    font-size: 15px;
    line-height: 1.5;
    word-wrap: break-word;
    font-weight: 400;
}

.message .timestamp {
    font-size: 11px;
    opacity: 0.7;
    margin-top: 6px;
    text-align: right;
    font-weight: 500;
}

/* Input form */
.message-input-form {
    position: relative;
    bottom: 0;
    left: 0;
    right: 0;
    min-height: var(--mobile-input-height);
    display: flex;
    align-items: center;
    gap: 12px;
    background: white;
    border-top: 1px solid var(--border-color);
    padding: 12px var(--spacing-md);
    box-shadow: 0 -4px 12px rgba(0,0,0,0.08);
    z-index: 99;
    flex-shrink: 0;
}

.message-input-form input {
    flex: 1;
    height: var(--mobile-input-height);
    border: 2px solid var(--border-color);
    border-radius: 28px;
    padding: 0 20px;
    font-size: 15px;
    background: var(--bg-color);
    color: #1a202c !important;
    transition: all 0.3s ease;
    font-weight: 400;
    -webkit-text-fill-color: #1a202c !important;
}

.message-input-form input::placeholder {
    color: #718096 !important;
    opacity: 0.6;
    -webkit-text-fill-color: #718096 !important;
}

.message-input-form input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: white;
    box-shadow: 0 0 0 4px rgba(74, 144, 226, 0.1);
    transform: translateY(-1px);
}

.message-input-form button[type="submit"] {
    width: var(--mobile-input-height);
    height: var(--mobile-input-height);
    background: var(--primary-gradient);
    color: var(--text-light);
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
}

.message-input-form button[type="submit"]:hover {
    transform: scale(1.1) rotate(5deg);
    box-shadow: var(--shadow-lg);
}

.message-input-form button[type="submit"]:active {
    transform: scale(0.95);
}

/* Emoji button */
.emoji-btn {
    width: var(--mobile-input-height);
    height: var(--mobile-input-height);
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    font-size: 22px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.emoji-btn:hover {
    background: white;
    border-color: var(--primary-color);
    transform: scale(1.1) rotate(-5deg);
    box-shadow: var(--shadow-sm);
}

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

/* Emoji picker - hidden by default */
#emoji-picker {
    display: none;
    position: absolute;
    bottom: 100%;
    left: 0;
    z-index: 1000;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    margin-bottom: var(--spacing-sm);
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: white;
    z-index: 200;
    transform: translateX(-100%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.sidebar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: var(--mobile-header-height);
    background: var(--primary-gradient);
    z-index: -1;
}

.main-content.sidebar-visible::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(2px);
    z-index: 199;
    animation: fadeIn 0.3s ease;
}

.main-content.sidebar-visible .sidebar {
    transform: translateX(0);
}

.main-content.sidebar-visible .chat-area {
    transform: translateX(100%);
}

.sidebar > div {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.sidebar > div:first-child {
    padding-top: calc(var(--mobile-header-height) + var(--spacing-md));
    background: var(--primary-color);
    color: var(--text-light);
    border-bottom: none;
}

/* Sidebar header */
.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    background: var(--primary-gradient);
    color: white;
    min-height: 64px;
    box-shadow: var(--shadow-md);
}

.sidebar-back-btn {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    color: white;
    border: none;
    font-size: 15px;
    padding: 10px 16px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    height: 40px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.sidebar-back-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateX(-4px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.sidebar-back-btn:active {
    transform: translateX(-2px);
}

.back-icon {
    font-size: 20px;
    font-weight: bold;
}

.back-text {
    font-size: 16px;
}

/* Header actions for mobile */
.header-actions-mobile {
    display: flex;
    gap: 10px;
    align-items: center;
}

.header-action-btn {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    color: #333;
    border: none;
    padding: 10px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.header-action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.25);
}

.header-action-btn:active {
    transform: translateY(0);
}

.header-action-btn.question-btn {
    background: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
    color: white;
}

.header-action-btn.question-btn:hover {
    box-shadow: 0 6px 20px rgba(72, 187, 120, 0.4);
}

.header-action-btn.logout-btn {
    background: linear-gradient(135deg, #fc8181 0%, #f56565 100%);
    color: white;
}

.header-action-btn.logout-btn:hover {
    box-shadow: 0 6px 20px rgba(245, 101, 101, 0.4);
}

.header-action-btn .action-icon {
    font-size: 18px;
    font-weight: bold;
}

/* Removed old menu section styles - buttons now in header */

/* Legacy action buttons (kept for backwards compatibility) */
.sidebar-actions {
    padding: var(--spacing-md);
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar-action-btn {
    width: 100%;
    height: var(--mobile-touch-target);
    background: var(--primary-color);
    color: var(--text-light);
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.sidebar-action-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

/* Online users */
.online-users-section {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    background: var(--bg-color);
}

.online-users-section h2 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-dark);
    letter-spacing: 0.3px;
}

.online-users-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.online-users-section li {
    padding: 14px 16px;
    margin-bottom: 10px;
    background: white;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: var(--shadow-sm);
}

.header-spacer {
    flex: 1;
}

.online-users-section li:hover {
    background: white;
    transform: translateX(6px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.online-users-section li:active {
    transform: translateX(3px);
}

.online-user-item::before {
    content: '';
    width: 10px;
    height: 10px;
    background: var(--success-color);
    border-radius: 50%;
    flex-shrink: 0;
    box-shadow: 0 0 0 3px rgba(72, 187, 120, 0.2);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 3px rgba(72, 187, 120, 0.2);
    }
    50% {
        box-shadow: 0 0 0 6px rgba(72, 187, 120, 0.1);
    }
}

/* Speaker actions */
.speaker-actions {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.speaker-actions h2 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-color);
}

.tabs {
    display: flex;
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 4px;
    margin-bottom: 16px;
}

.tab-button {
    flex: 1;
    padding: 12px;
    background: transparent;
    border: none;
    border-radius: calc(var(--border-radius) - 4px);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab-button.active {
    background: var(--primary-color);
    color: var(--text-light);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.question-item {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.question-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.question-item p {
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 12px;
    color: var(--text-dark);
    font-weight: 400;
}

.question-item .meta {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 16px;
    font-weight: 500;
}

.question-item button.mark-answered {
    background: var(--primary-gradient);
    color: var(--text-light);
    border: none;
    padding: 10px 20px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
}

.question-item button.mark-answered:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.question-item button.mark-answered:active {
    transform: translateY(0);
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal-content {
    background: white;
    border-radius: 20px;
    padding: 32px;
    width: 100%;
    max-width: 440px;
    max-height: 85vh;
    overflow-y: auto;
    position: relative;
    box-shadow: var(--shadow-xl);
    transform: scale(0.9) translateY(20px);
    animation: modalSlideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes modalSlideIn {
    to {
        transform: scale(1) translateY(0);
    }
}

.close-button {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    background: var(--bg-color);
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--text-muted);
}

.close-button:hover {
    background: var(--border-color);
    transform: rotate(90deg);
    color: var(--text-dark);
}

.close-button:active {
    transform: rotate(90deg) scale(0.9);
}

/* Form elements */
.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-dark);
    letter-spacing: 0.3px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 15px;
    background: var(--bg-color);
    color: #1a202c !important;
    transition: all 0.3s ease;
    font-weight: 400;
    -webkit-text-fill-color: #1a202c !important;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: white;
    box-shadow: 0 0 0 4px rgba(74, 144, 226, 0.1);
    transform: translateY(-1px);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.submit-btn {
    width: 100%;
    padding: 14px 24px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-md);
    letter-spacing: 0.5px;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.submit-btn:active {
    transform: translateY(0);
}

/* Error and success messages */
.error-message,
.success-message {
    padding: 12px 16px;
    border-radius: var(--mobile-border-radius);
    margin-bottom: 16px;
    font-size: 14px;
}

.error-message {
    background: #fee;
    color: #c33;
    border: 1px solid #fcc;
}

.success-message {
    background: #efe;
    color: #363;
    border: 1px solid #cfc;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Landscape orientation adjustments */
@media (orientation: landscape) {
    .chat-container {
        height: 100vh;
    }
    
    .message-list {
        padding-bottom: calc(var(--mobile-bottom-bar-height) + var(--spacing-md));
    }
    
    .message-input-form {
        position: fixed;
        bottom: 0;
    }
}

/* Desktop styles (ensure overrides if needed) */
@media (min-width: 901px) {
    #toggle-sidebar-btn {
        display: none; /* Ensure toggle is hidden */
    }
    .mobile-only {
        display: none !important;
    }
    
    .chat-header {
        flex-direction: row; /* Ensure row layout */
        align-items: center;
        justify-content: space-between;
    }
    .header-user-info {
         text-align: right;
         order: 0; /* Reset order */
         /* padding-left: 20px; No longer needed with flex gap? */
    }
    /* Ensure header actions container is displayed correctly */
    .header-actions {
        display: flex; /* Use flexbox for desktop actions */
        align-items: center;
        gap: var(--spacing-lg); /* Increased space between desktop buttons */
        margin-left: var(--spacing-md); /* Add space between user info and actions */
    }
    
    /* Ensure sidebar is visible and properly sized on desktop */
    .sidebar {
        position: relative;
        width: 300px;
        transform: none;
        border-left: 1px solid var(--border-color);
    }
    
    /* Ensure chat area is visible on desktop */
    .chat-area {
        flex: 1;
        display: flex;
        flex-direction: column;
    }
    
    .main-content.sidebar-visible .chat-area {
        transform: none;
    }
    
    .message-input-form {
        position: relative;
        box-shadow: none;
    }
    
    .message-list {
        padding-bottom: var(--spacing-md);
    }
}

/* ... rest of existing CSS ... */

@keyframes flash {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.flashing-notification {
  animation: flash 1.5s infinite;
  font-weight: bold; /* Keep it bold too */
}

.online-user-item .new-pm-badge {
    color: #ff4d4d; /* Make the dot red */
    margin-left: var(--spacing-xs);
}

/* --- ADDED: Specific sizing for Private Chat Modal --- */
#private-chat-modal .modal-content {
    max-width: 450px; /* Make it slightly narrower */
    max-height: 70vh; /* Limit max height to 70% of viewport height */
    display: flex; /* Use flexbox for layout */
    flex-direction: column; /* Stack elements vertically */
}

#private-chat-messages {
    flex-grow: 1; /* Allow message list to take available space */
    overflow-y: auto; /* Make the message list scrollable */
    min-height: 150px; /* Give it a minimum height */
    margin-bottom: var(--spacing-md); /* Space before the input form */
    background-color: var(--background-color); /* Slightly different bg */
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-sm); /* Add padding inside message area */
}

#private-chat-form {
    flex-shrink: 0; /* Prevent form from shrinking */
}
/* --- END ADDED --- */

/* Admin Dashboard Styles */
.admin-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px;
    min-height: 100vh;
    background: var(--bg-color);
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    padding: 32px;
    background: var(--primary-gradient);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    color: white;
}

.admin-header h1 {
    margin: 0;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.admin-header .logout-btn {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.admin-header .logout-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.admin-section {
    background: white;
    border-radius: 20px;
    padding: 32px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    min-height: 400px;
    display: flex;
    flex-direction: column;
}

.admin-section h2 {
    margin: 0 0 24px 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    letter-spacing: -0.3px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-top: 24px;
}

.stat-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.stat-card h3 {
    margin: 0 0 12px 0;
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-card p {
    margin: 0;
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.table-container {
    overflow-x: auto;
    overflow-y: auto;
    max-height: calc(100vh - 450px);
    min-height: 400px;
    margin-top: 20px;
    width: 100%;
    border: 2px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    background: white;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
    position: relative;
    flex: 1;
}

/* Custom scrollbar for table container */
.table-container::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.table-container::-webkit-scrollbar-track {
    background: var(--bg-color);
    border-radius: 4px;
}

.table-container::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

.table-container::-webkit-scrollbar-thumb:hover {
    background: var(--primary-hover);
}

#users-table,
#reset-requests-table {
    width: 100%;
    min-width: 800px;
    border-collapse: collapse;
}

#users-table th,
#users-table td,
#reset-requests-table th,
#reset-requests-table td {
    padding: 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

#users-table th,
#reset-requests-table th {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    font-weight: 700;
    color: var(--text-dark);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: sticky;
    top: 0;
    z-index: 10;
}

#users-table tbody tr,
#reset-requests-table tbody tr {
    transition: background-color 0.2s ease;
}

#users-table tbody tr:hover,
#reset-requests-table tbody tr:hover {
    background-color: var(--bg-color);
}

.action-buttons {
    display: flex;
    gap: 12px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.danger-btn {
    background: linear-gradient(135deg, #fc8181 0%, #f56565 100%);
    color: white;
    border: none;
    padding: 14px 24px;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-md);
}

.danger-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(245, 101, 101, 0.4);
}

.danger-btn:active {
    transform: translateY(0);
}

.primary-btn {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: 14px 24px;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-md);
}

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

.primary-btn:active {
    transform: translateY(0);
}

.secondary-btn {
    background: var(--bg-color);
    color: var(--text-dark);
    border: 2px solid var(--border-color);
    padding: 14px 24px;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.secondary-btn:hover {
    background: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.secondary-btn:active {
    transform: translateY(0);
}

.log-container {
    max-height: 400px;
    overflow-y: auto;
    background: var(--bg-color);
    padding: 20px;
    border-radius: 16px;
    margin-top: 20px;
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

#activity-log {
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
}

.log-entry {
    margin-bottom: 12px;
    padding: 12px;
    background: white;
    border-radius: 8px;
    border-left: 3px solid var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.log-entry:last-child {
    margin-bottom: 0;
}

/* User Status Indicators */
.status-active {
    color: #28a745;
}

.status-blocked {
    color: #dc3545;
}

.status-inactive {
    color: #6c757d;
}

/* Admin Info/Warning Boxes */
.admin-section > div[style*="background-color: #f5f5f5"] {
    background: linear-gradient(135deg, #fff5f5 0%, #fee 100%) !important;
    border: 2px solid #fcc !important;
    border-radius: 16px !important;
    padding: 24px !important;
    margin-top: 24px !important;
    box-shadow: var(--shadow-sm) !important;
}

.admin-section > div[style*="background-color: #f5f5f5"] h3 {
    color: var(--text-dark);
    font-weight: 700;
    margin-bottom: 16px;
}

.admin-section > div[style*="background-color: #f5f5f5"] ul {
    margin: 12px 0 12px 24px;
}

.admin-section > div[style*="background-color: #f5f5f5"] li {
    margin-bottom: 8px;
    color: var(--text-dark);
}

/* Admin Create User Form */
#create-user-form {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 16px;
    margin-bottom: 24px !important;
    border: 2px solid var(--border-color);
}

#create-user-form label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    color: var(--text-dark);
    font-size: 0.875rem;
}

#create-user-form input,
#create-user-form select {
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background: white;
    color: #1a202c !important;
    font-size: 0.9375rem;
    transition: all 0.3s ease;
    -webkit-text-fill-color: #1a202c !important;
}

#create-user-form input:focus,
#create-user-form select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(74, 144, 226, 0.1);
}

/* Modal Actions */
.modal-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    justify-content: flex-end;
}

/* Responsive Design */
@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .action-buttons {
        flex-direction: column;
    }

    .admin-container {
        padding: 16px;
    }

    .admin-header {
        flex-direction: column;
        gap: 16px;
        text-align: center;
        padding: 24px;
    }

    .admin-section {
        padding: 20px;
    }

    .admin-tabs {
        flex-direction: column;
    }

    .tab-button {
        min-width: 100%;
    }

    .table-container {
        border-radius: 12px;
        max-height: calc(100vh - 400px);
        min-height: 300px;
    }

    #create-user-form {
        padding: 16px;
    }
}

/* Admin Tabs */
.admin-tabs {
    display: flex;
    gap: 8px;
    background: white;
    padding: 8px;
    border-radius: 16px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.tab-button {
    padding: 14px 24px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.9375rem;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 12px;
    flex: 1;
    min-width: 140px;
    text-align: center;
    position: relative;
}

.tab-button:hover {
    background: var(--bg-color);
    color: var(--text-dark);
}

.tab-button.active {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

.tab-button.active:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Tab Panels */
.tab-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Tab filter buttons for password resets */
.tab-filter {
    padding: 10px 20px;
    border: 2px solid var(--border-color);
    background: white;
    cursor: pointer;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tab-filter:hover {
    background: var(--bg-color);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.tab-filter.active {
    background: var(--primary-gradient);
    color: white;
    border-color: transparent;
    box-shadow: var(--shadow-md);
}

.tab-filter.active:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Status badges */
.status-badge {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
}

.status-pending {
    background: #fff3cd;
    color: #856404;
}

.status-completed {
    background: #d4edda;
    color: #155724;
}

.status-rejected {
    background: #f8d7da;
    color: #721c24;
}

/* === Enhanced Mobile Responsive Design === */

/* Mobile-first responsive design */
@media (max-width: 480px) {
    /* iPhone and small Android phones */
    :root {
        --font-size-base: var(--mobile-font-size-base);
        --spacing-xs: var(--mobile-spacing-xs);
        --spacing-sm: var(--mobile-spacing-sm);
        --spacing-md: var(--mobile-spacing-md);
        --spacing-lg: var(--mobile-spacing-lg);
        --spacing-xl: var(--mobile-spacing-xl);
    }
    
    body {
        font-size: var(--mobile-font-size-base);
        padding: 0;
        margin: 0;
    }
    
    .chat-container {
        width: 100%;
        height: 100vh;
        max-width: none;
        border-radius: 0;
        box-shadow: none;
        padding: 0;
    }
    
    .chat-header {
        padding: var(--spacing-sm) var(--spacing-md);
        padding-top: calc(var(--spacing-sm) + var(--safe-area-top));
        position: relative;
        top: 0;
        z-index: 100;
        background-color: var(--surface-color);
        border-bottom: 1px solid var(--border-color);
    }
    
    .header-logo {
        height: 28px;
    }
    
    .chat-header h1 {
        font-size: 1.1em;
    }
    
    /* Enhanced touch targets */
    button, input[type="submit"], .btn-primary, .btn-secondary {
        min-height: var(--mobile-touch-target);
        min-width: var(--mobile-touch-target);
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--mobile-font-size-base);
    }
    
    #toggle-sidebar-btn {
        font-size: 1.8em;
        padding: var(--spacing-sm);
        min-width: var(--mobile-touch-target);
        min-height: var(--mobile-touch-target);
    }
    
    /* Message input improvements */
    .message-input-form {
        padding: var(--spacing-sm) var(--spacing-md);
        padding-bottom: calc(var(--spacing-sm) + var(--safe-area-bottom));
        flex-shrink: 0; /* Ensure input form stays at bottom */
    }
    
    .message-input-form input {
        font-size: var(--mobile-font-size-base);
        padding: var(--spacing-sm) var(--spacing-md);
        min-height: var(--mobile-touch-target);
    }
    
    /* Message bubbles */
    .message {
        max-width: 85%;
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--mobile-font-size-base);
        line-height: 1.4;
    }
    
    /* Modal improvements for mobile */
    .modal {
        padding: 12px;
        align-items: flex-start;
        padding-top: 20px;
    }
    
    .modal-content {
        width: 95%;
        max-width: none;
        margin: 0;
        padding: 20px 16px;
        border-radius: 12px;
        max-height: 90vh;
        overflow-y: auto;
        box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    }
    
    .modal-content h2 {
        font-size: 20px;
        margin-bottom: 20px;
        text-align: center;
        color: #333;
    }
    
    .close-button {
        top: 12px;
        right: 12px;
        width: 36px;
        height: 36px;
        font-size: 20px;
        background: #f0f0f0;
    }
    
    /* Enhanced modal for private chat */
    #private-chat-modal .modal-content {
        width: 95%;
        max-width: none;
        height: 80vh;
        margin: 5% auto;
        display: flex;
        flex-direction: column;
    }
    
    #private-chat-messages {
        flex-grow: 1;
        min-height: 200px;
        max-height: none;
    }
    
    /* Sidebar content improvements */
    .sidebar h2 {
        font-size: 1.2em;
        margin-bottom: var(--spacing-md);
    }
    
    .online-users-section li {
        padding: var(--spacing-sm) var(--spacing-md);
        min-height: var(--mobile-touch-target);
        font-size: var(--mobile-font-size-base);
    }
    
    .sidebar-header {
        padding: 12px 16px;
        background: var(--primary-color);
        color: white;
    }
    
    .sidebar-back-btn {
        font-size: 14px;
        padding: 6px 10px;
    }
    
    .header-action-btn {
        width: 32px;
        height: 32px;
        padding: 6px;
    }
    
    .header-action-btn .action-icon {
        font-size: 13px;
    }
    
    .sidebar-actions {
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
    }
    
    .sidebar-action-btn {
        min-height: var(--mobile-touch-target);
        font-size: var(--mobile-font-size-base);
        font-weight: 600;
    }
    
    /* Improved emoji picker positioning */
    #emoji-picker {
        position: fixed;
        bottom: 80px;
        left: 50%;
        transform: translateX(-50%);
        z-index: 150;
        max-width: 90vw;
        max-height: 40vh;
    }
    
    /* Better close button for modals */
    .close-button {
        position: absolute;
        top: var(--spacing-sm);
        right: var(--spacing-sm);
        font-size: 28px;
        min-width: var(--mobile-touch-target);
        min-height: var(--mobile-touch-target);
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 50%;
        background-color: rgba(0, 0, 0, 0.1);
    }
    
    /* Improved form elements */
    .form-group {
        margin-bottom: var(--spacing-md);
    }
    
    .form-group label {
        font-size: var(--mobile-font-size-base);
        font-weight: 600;
        margin-bottom: var(--spacing-xs);
    }
    
    /* Better error/success messages */
    .error-message, .success-message {
        font-size: var(--mobile-font-size-base);
        padding: var(--spacing-sm) var(--spacing-md);
        margin-top: var(--spacing-sm);
        border-radius: var(--border-radius);
    }
    
    /* Enhanced focus indicators for accessibility */
    button:focus, input:focus, select:focus, textarea:focus {
        outline: 2px solid var(--primary-color);
        outline-offset: 2px;
    }
    
    /* Loading states */
    .loading {
        opacity: 0.6;
        pointer-events: none;
    }
    
    /* Better visual feedback for touch interactions */
    button:active, input[type="submit"]:active, .btn-primary:active, .btn-secondary:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }
    
    /* Improved scrolling */
    .message-list, .sidebar, .modal-content {
        -webkit-overflow-scrolling: touch;
        scroll-behavior: smooth;
    }
    
    /* Better text selection */
    .message .content, .question-item p {
        -webkit-user-select: text;
        user-select: text;
    }
    
    /* Bottom navigation bar */
    .bottom-nav {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: var(--mobile-bottom-bar-height);
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(10px);
        border-top: 1px solid var(--border-color);
        display: flex;
        justify-content: space-around;
        align-items: center;
        z-index: 98;
        box-shadow: 0 -4px 12px rgba(0,0,0,0.1);
        padding-bottom: var(--safe-area-bottom);
    }

    .bottom-nav button {
        background: none;
        border: none;
        color: var(--text-muted);
        font-size: 24px;
        cursor: pointer;
        padding: 8px;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        min-width: var(--mobile-touch-target);
        min-height: var(--mobile-touch-target);
        border-radius: 12px;
        display: flex;
        align-items: center;
        justify-content: center;
        position: relative;
    }

    .bottom-nav button:active {
        transform: scale(0.9);
    }

    .bottom-nav button.active {
        color: var(--primary-color);
        background: var(--primary-light);
    }

    .bottom-nav button.active::after {
        content: '';
        position: absolute;
        bottom: -1px;
        left: 50%;
        transform: translateX(-50%);
        width: 40px;
        height: 3px;
        background: var(--primary-gradient);
        border-radius: 3px 3px 0 0;
    }
}

/* Hide bottom nav on desktop */
@media (min-width: 901px) {
    .bottom-nav {
        display: none !important;
    }
}

/* ===== TABLET DESIGN (481px - 1024px) ===== */
@media (min-width: 481px) and (max-width: 1024px) {
    /* Tablet-specific variables */
    :root {
        --tablet-spacing: 16px;
        --tablet-border-radius: 16px;
        --tablet-touch-target: 48px;
        --tablet-header-height: 70px;
        --tablet-input-height: 56px;
    }

    /* Tablet container */
    .chat-container {
        height: 100vh;
        display: flex;
        flex-direction: column;
        overflow: hidden;
        background: var(--surface-color);
    }

    /* Tablet header */
    .chat-header {
        height: var(--tablet-header-height);
        background: var(--primary-color);
        color: white;
        display: flex;
        align-items: center;
        padding: 0 var(--tablet-spacing);
        position: relative;
        box-shadow: 0 2px 12px rgba(0,0,0,0.15);
        z-index: 100;
    }

    .header-main {
        display: flex;
        align-items: center;
        gap: var(--tablet-spacing);
        flex: 1;
    }

    .header-logo {
        height: 40px;
        width: auto;
    }

    .header-user-info {
        font-size: 16px;
        opacity: 0.9;
        flex: 1;
        text-align: center;
    }

    .header-user-info strong {
        font-weight: 600;
    }

    /* Tablet hamburger menu */
    #toggle-sidebar-btn {
        width: var(--tablet-touch-target);
        height: var(--tablet-touch-target);
        background: rgba(255,255,255,0.2);
        border: none;
        border-radius: 50%;
        color: white;
        font-size: 24px;
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        transition: all 0.2s ease;
        backdrop-filter: blur(10px);
    }

    #toggle-sidebar-btn:hover {
        background: rgba(255,255,255,0.3);
        transform: scale(1.05);
    }

    #toggle-sidebar-btn:active {
        transform: scale(0.95);
    }

    /* Hide desktop elements on tablet */
    .desktop-only {
        display: none !important;
    }

    .header-actions {
        display: none;
    }

    /* Main content area */
    .main-content {
        flex: 1;
        display: flex;
        position: relative;
        overflow: hidden;
    }

    /* Chat area */
    .chat-area {
        flex: 1;
        display: flex;
        flex-direction: column;
        background: var(--surface-color);
        transition: transform 0.3s ease;
    }

    /* Message list */
    .message-list {
        flex: 1;
        overflow-y: auto;
        padding: var(--tablet-spacing);
        background: var(--surface-color);
        -webkit-overflow-scrolling: touch;
    }

    /* Tablet message styling */
    .message {
        margin-bottom: 20px;
        max-width: 80%;
        animation: fadeInUp 0.3s ease;
    }

    .message.sent {
        margin-left: auto;
        background: var(--primary-color);
        color: white;
        border-radius: 20px 20px 6px 20px;
        padding: 14px 18px;
        box-shadow: 0 3px 6px rgba(0,0,0,0.1);
    }

    .message.received {
        margin-right: auto;
        background: white;
        color: var(--text-color);
        border-radius: 20px 20px 20px 6px;
        padding: 14px 18px;
        box-shadow: 0 3px 6px rgba(0,0,0,0.1);
        border: 1px solid var(--border-color);
    }

    .message .sender {
        font-size: 13px;
        font-weight: 600;
        margin-bottom: 6px;
        opacity: 0.8;
    }

    .message .content {
        font-size: 17px;
        line-height: 1.4;
        word-wrap: break-word;
    }

    .message .timestamp {
        font-size: 12px;
        opacity: 0.6;
        margin-top: 6px;
        text-align: right;
    }

    /* Tablet input form */
    .message-input-form {
        background: white;
        border-top: 1px solid var(--border-color);
        padding: var(--tablet-spacing);
        display: flex;
        align-items: center;
        gap: 12px;
        box-shadow: 0 -3px 12px rgba(0,0,0,0.1);
        flex-shrink: 0; /* Ensure input form stays at bottom */
    }

    .message-input-form input {
        flex: 1;
        height: var(--tablet-input-height);
        border: 1px solid var(--border-color);
        border-radius: 28px;
        padding: 0 20px;
        font-size: 17px;
        background: var(--surface-color);
        transition: border-color 0.2s ease;
    }

    .message-input-form input:focus {
        outline: none;
        border-color: var(--primary-color);
        box-shadow: 0 0 0 4px rgba(51, 122, 183, 0.1);
    }

    .message-input-form button[type="submit"] {
        width: var(--tablet-input-height);
        height: var(--tablet-input-height);
        background: var(--primary-color);
        color: white;
        border: none;
        border-radius: 50%;
        font-size: 20px;
        cursor: pointer;
        transition: all 0.2s ease;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .message-input-form button[type="submit"]:hover {
        background: var(--primary-hover-color);
        transform: scale(1.05);
    }

    .message-input-form button[type="submit"]:active {
        transform: scale(0.95);
    }

    /* Emoji button */
    .emoji-btn {
        width: var(--tablet-input-height);
        height: var(--tablet-input-height);
        background: transparent;
        border: 1px solid var(--border-color);
        border-radius: 50%;
        font-size: 20px;
        cursor: pointer;
        transition: all 0.2s ease;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .emoji-btn:hover {
        background: var(--surface-color);
        border-color: var(--primary-color);
    }

    /* Tablet sidebar */
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: white;
        z-index: 200;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        display: flex;
        flex-direction: column;
        overflow: hidden;
    }

    /* Sidebar header */
    .sidebar::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: var(--tablet-header-height);
        background: var(--primary-color);
        z-index: -1;
    }

    /* Show sidebar when active */
    .main-content.sidebar-visible .sidebar {
        transform: translateX(0);
    }

    .main-content.sidebar-visible .chat-area {
        transform: translateX(100%);
    }

    /* Sidebar content */
    .sidebar > div {
        padding: var(--tablet-spacing);
        border-bottom: 1px solid var(--border-color);
    }

    /* Sidebar header with close button */
    .sidebar > div:first-child {
        padding-top: calc(var(--tablet-header-height) + var(--tablet-spacing));
        background: var(--primary-color);
        color: white;
        border-bottom: none;
    }

    /* Tablet sidebar header */
    .sidebar-header {
        padding: var(--tablet-spacing);
        background: var(--primary-color);
        color: white;
    }
    
    .sidebar-back-btn {
        font-size: 16px;
        padding: 10px 16px;
    }
    
    .header-action-btn {
        width: 40px;
        height: 40px;
        padding: 8px;
    }
    
    .header-action-btn .action-icon {
        font-size: 15px;
    }
    
    /* Tablet action buttons */
    .sidebar-actions {
        padding: var(--tablet-spacing);
        background: var(--surface-color);
        border-bottom: 1px solid var(--border-color);
    }

    .sidebar-action-btn {
        width: 100%;
        height: var(--tablet-touch-target);
        background: var(--primary-color);
        color: white;
        border: none;
        border-radius: var(--tablet-border-radius);
        font-size: 17px;
        font-weight: 600;
        margin-bottom: 12px;
        cursor: pointer;
        transition: all 0.2s ease;
    }

    .sidebar-action-btn:hover {
        background: var(--primary-hover-color);
        transform: translateY(-2px);
        box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    }

    .sidebar-action-btn:active {
        transform: translateY(0);
    }

    /* Online users section */
    .online-users-section {
        flex: 1;
        overflow-y: auto;
        padding: var(--tablet-spacing);
    }

    .online-users-section h2 {
        font-size: 20px;
        font-weight: 600;
        margin-bottom: 20px;
        color: var(--text-color);
    }

    .online-users-section ul {
        list-style: none;
        padding: 0;
        margin: 0;
    }

    .online-users-section li {
        padding: 16px 20px;
        margin-bottom: 12px;
        background: white;
        border-radius: var(--tablet-border-radius);
        border: 1px solid var(--border-color);
        cursor: pointer;
        transition: all 0.2s ease;
        display: flex;
        align-items: center;
        gap: 16px;
    }

    .online-users-section li:hover {
        background: var(--surface-color);
        transform: translateX(6px);
        box-shadow: 0 4px 16px rgba(0,0,0,0.1);
    }

    /* User status indicator */
    .online-user-item::before {
        content: '';
        width: 14px;
        height: 14px;
        background: #28a745;
        border-radius: 50%;
        flex-shrink: 0;
    }

    /* Speaker actions */
    .speaker-actions {
        flex: 1;
        overflow-y: auto;
        padding: var(--tablet-spacing);
    }

    .speaker-actions h2 {
        font-size: 20px;
        font-weight: 600;
        margin-bottom: 20px;
        color: var(--text-color);
    }

    /* Tabs for speaker actions */
    .tabs {
        display: flex;
        background: var(--surface-color);
        border-radius: var(--tablet-border-radius);
        padding: 6px;
        margin-bottom: 20px;
    }

    .tab-button {
        flex: 1;
        padding: 14px;
        background: transparent;
        border: none;
        border-radius: calc(var(--tablet-border-radius) - 6px);
        font-size: 15px;
        font-weight: 600;
        cursor: pointer;
        transition: all 0.2s ease;
    }

    .tab-button.active {
        background: var(--primary-color);
        color: white;
    }

    /* Question items */
    .question-item {
        background: white;
        border: 1px solid var(--border-color);
        border-radius: var(--tablet-border-radius);
        padding: 20px;
        margin-bottom: 16px;
    }

    .question-item p {
        font-size: 17px;
        line-height: 1.4;
        margin-bottom: 12px;
        color: var(--text-color);
    }

    .question-item .meta {
        font-size: 13px;
        color: #666;
        margin-bottom: 16px;
    }

    .question-item button.mark-answered {
        background: var(--primary-color);
        color: white;
        border: none;
        padding: 10px 20px;
        border-radius: var(--tablet-border-radius);
        font-size: 15px;
        cursor: pointer;
        transition: all 0.2s ease;
    }

    .question-item button.mark-answered:hover {
        background: var(--primary-hover-color);
        transform: translateY(-1px);
    }

    /* Tablet modals */
    .modal {
        padding: 20px;
        background: rgba(0,0,0,0.6);
        z-index: 1000;
    }

    .modal-content {
        background: white;
        border-radius: 16px;
        padding: 28px 24px;
        width: 100%;
        max-width: 480px;
        max-height: 85vh;
        overflow-y: auto;
        position: relative;
        box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    }
    
    .modal-content h2 {
        font-size: 22px;
        margin-bottom: 24px;
        text-align: center;
    }

    .close-button {
        position: absolute;
        top: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
        background: var(--surface-color);
        border: none;
        border-radius: 50%;
        font-size: 20px;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all 0.2s ease;
    }

    .close-button:hover {
        background: var(--border-color);
    }

    /* Form elements */
    .form-group {
        margin-bottom: 24px;
    }

    .form-group label {
        display: block;
        font-size: 15px;
        font-weight: 600;
        margin-bottom: 10px;
        color: var(--text-color);
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
        width: 100%;
        padding: 14px 20px;
        border: 1px solid var(--border-color);
        border-radius: var(--tablet-border-radius);
        font-size: 17px;
        background: var(--surface-color);
        transition: border-color 0.2s ease;
    }

    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
        outline: none;
        border-color: var(--primary-color);
        box-shadow: 0 0 0 4px rgba(51, 122, 183, 0.1);
    }

    /* Error and success messages */
    .error-message,
    .success-message {
        padding: 16px 20px;
        border-radius: var(--tablet-border-radius);
        margin-bottom: 20px;
        font-size: 15px;
    }

    .error-message {
        background: #fee;
        color: #c33;
        border: 1px solid #fcc;
    }

    .success-message {
        background: #efe;
        color: #363;
        border: 1px solid #cfc;
    }

    /* Landscape orientation adjustments */
    @media (orientation: landscape) {
        .chat-header {
            height: 60px;
        }

        .message-input-form {
            padding: 12px var(--tablet-spacing);
            flex-shrink: 0; /* Ensure input form stays at bottom */
        }

        .message-input-form input {
            height: 48px;
        }

        .message-input-form button[type="submit"] {
            width: 48px;
            height: 48px;
        }

        .emoji-btn {
            width: 48px;
            height: 48px;
        }
    }
}

/* Enhanced tablet support specifically for iPad sizes (768px - 1024px) */
@media (min-width: 768px) and (max-width: 1024px) {
    /* Increase header height and padding for better touch interaction */
    .chat-header {
        height: 80px;
        padding: 0 24px;
    }
    
    /* Adjust message bubbles for larger screens */
    .message {
        max-width: 70%;
        padding: 16px 20px;
        font-size: 18px;
        border-radius: 24px;
    }
    
    /* Widen sidebar for tablet landscape */
    .sidebar {
        width: 350px;
    }
    
    /* Increase input form size */
    .message-input-form {
        padding: 20px;
    }
    
    .message-input-form input {
        height: 60px;
        font-size: 18px;
        padding: 0 24px;
    }
    
    /* Larger buttons */
    button, .btn {
        min-height: 50px;
        font-size: 16px;
    }
    
    /* Adjust modal for tablet */
    .modal-content {
        max-width: 600px;
        padding: 32px;
    }
}

/* Landscape orientation adjustments */
@media (max-width: 900px) and (orientation: landscape) {
    .chat-header {
        padding: var(--spacing-xs) var(--spacing-md);
    }
    
    .header-logo {
        height: 24px;
    }
    
    .chat-header h1 {
        font-size: 1em;
    }
    
    .message-input-form {
        padding: var(--spacing-xs) var(--spacing-md);
        flex-shrink: 0; /* Ensure input form stays at bottom */
    }
    
    /* Reduce sidebar height in landscape */
    .sidebar {
        height: 100vh;
        padding-top: var(--spacing-md);
    }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .header-logo, .auth-logo {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* Accessibility - Focus Visible */
*:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
a:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

/* Skip to main content link for screen readers */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 9999;
}

.skip-link:focus {
    top: 0;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a1a1a;
        --background-color: #1a1a1a;
        --surface-color: #2d2d2d;
        --text-color: #e0e0e0;
        --text-light: #ffffff;
        --text-dark: #e0e0e0;
        --border-color: #404040;
        --primary-color: #5ca3dd;
        --primary-hover: #4a8fc7;
        --primary-hover-color: #4a8fc7;
        --success-color: #4caf50;
        --error-color: #f44336;
    }
    
    body {
        background-color: var(--background-color);
        color: var(--text-color);
    }
    
    .message.received {
        background: #3d3d3d;
        color: var(--text-color);
        border-color: var(--border-color);
    }
    
    .modal-content {
        background: var(--surface-color);
        color: var(--text-color);
    }
    
    .sidebar {
        background: var(--surface-color);
    }
    
    input, select, textarea {
        background: #3d3d3d;
        color: var(--text-color);
        border-color: var(--border-color);
    }
    
    .online-users-section li {
        background: #3d3d3d;
        border-color: var(--border-color);
    }
    
    .question-item {
        background: #3d3d3d;
        border-color: var(--border-color);
    }
}

/* Dark mode toggle - manual control */
body.dark-mode {
    --bg-color: #1a1a1a;
    --background-color: #1a1a1a;
    --surface-color: #2d2d2d;
    --text-color: #e0e0e0;
    --text-light: #ffffff;
    --text-dark: #e0e0e0;
    --border-color: #404040;
    --primary-color: #5ca3dd;
    --primary-hover: #4a8fc7;
    --primary-hover-color: #4a8fc7;
}

body.dark-mode .message.received {
    background: #3d3d3d;
    color: var(--text-color);
    border-color: var(--border-color);
}

body.dark-mode .modal-content {
    background: var(--surface-color);
    color: var(--text-color);
}

body.dark-mode .sidebar {
    background: var(--surface-color);
}

body.dark-mode input,
body.dark-mode select,
body.dark-mode textarea {
    background: #3d3d3d;
    color: var(--text-color);
    border-color: var(--border-color);
}

body.dark-mode .online-users-section li {
    background: #3d3d3d;
    border-color: var(--border-color);
}

body.dark-mode .question-item {
    background: #3d3d3d;
    border-color: var(--border-color);
}

/* Base auth form styles */
.auth-form-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

.auth-form {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.auth-links {
    margin-top: 20px;
}

.auth-links p {
    margin: 10px 0;
    font-size: 14px;
}

.forgot-password-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.forgot-password-link:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

.help-text {
    margin-top: 20px;
    padding: 15px;
    background: #f0f8ff;
    border-radius: 8px;
    font-size: 13px;
    color: #555;
    text-align: left;
}

.auth-form h2 {
    color: var(--text-dark);
    margin-bottom: var(--spacing-lg);
    font-size: 1.8em;
    font-weight: 600;
}

.auth-form input {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 16px;
    margin-bottom: var(--spacing-md);
    transition: border-color 0.2s ease;
}

.auth-form input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(51, 122, 183, 0.1);
}

.auth-form button {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease;
    margin-top: var(--spacing-md);
}

.auth-form button:hover {
    background: var(--primary-dark);
}

.auth-logo {
    height: 80px;
    margin-bottom: var(--spacing-lg);
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.auth-form p {
    margin-top: var(--spacing-lg);
    color: var(--text-muted);
}

.auth-form a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.auth-form a:hover {
    text-decoration: underline;
}

/* Mobile-optimized auth forms */
@media (max-width: 480px) {
    .auth-form-container {
        padding: var(--spacing-md);
        padding-top: calc(var(--spacing-md) + var(--safe-area-top));
        padding-bottom: calc(var(--spacing-md) + var(--safe-area-bottom));
    }
    
    .auth-form {
        width: 100%;
        max-width: none;
        padding: var(--spacing-lg);
        border-radius: var(--border-radius-lg);
    }
    
    .auth-form h2 {
        font-size: 1.6em;
        margin-bottom: var(--spacing-lg);
    }
    
    .auth-form input {
        font-size: var(--mobile-font-size-base);
        padding: var(--spacing-sm) var(--spacing-md);
        min-height: var(--mobile-touch-target);
        margin-bottom: var(--spacing-md);
    }
    
    .auth-form button {
        width: 100%;
        min-height: var(--mobile-touch-target);
        font-size: var(--mobile-font-size-large);
        font-weight: 600;
        margin-top: var(--spacing-lg);
    }
    
    .auth-logo {
        height: 60px;
        margin-bottom: var(--spacing-lg);
    }
}

/* Repeat for mobile and tablet media queries */
@media (max-width: 900px) {
    html, body {
        overflow: hidden;
    }
    .chat-container {
        height: 100vh;
        overflow: hidden;
    }
    .main-content {
        flex: 1 1 auto;
        min-height: 0;
    }
    .chat-area {
        flex: 1 1 auto;
        min-height: 0;
    }
    .message-list {
        flex: 1 1 auto;
        min-height: 0;
        overflow-y: auto;
    }
    .message-input-form {
        flex-shrink: 0 !important;
        display: flex;
        align-items: center;
        gap: 8px;
        background: white;
        border-top: 1px solid var(--border-color);
        padding: var(--spacing-md);
        box-shadow: 0 -2px 8px rgba(0,0,0,0.1);
    }
}
@media (min-width: 481px) and (max-width: 1024px) {
    html, body {
        overflow: hidden;
    }
    .chat-container {
        height: 100vh;
        overflow: hidden;
    }
    .main-content {
        flex: 1 1 auto;
        min-height: 0;
    }
    .chat-area {
        flex: 1 1 auto;
        min-height: 0;
    }
    .message-list {
        flex: 1 1 auto;
        min-height: 0;
        overflow-y: auto;
    }
    .message-input-form {
        flex-shrink: 0 !important;
        display: flex;
        align-items: center;
        gap: 8px;
        background: white;
        border-top: 1px solid var(--border-color);
        padding: var(--spacing-md);
        box-shadow: 0 -2px 8px rgba(0,0,0,0.1);
    }
}

/* Desktop header buttons */
.header-actions button {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    color: var(--text-light);
    border: none;
    padding: 10px 20px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.header-actions button:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.header-actions button:active {
    transform: translateY(0);
}

.header-actions .ask-question-btn {
    margin-right: var(--spacing-sm);
}

.theme-toggle {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

@media (max-width: 480px) {
    /* Improved message input */
    .message-input-form {
        padding: var(--spacing-sm) var(--spacing-md);
        padding-bottom: calc(var(--spacing-sm) + var(--safe-area-bottom));
        flex-shrink: 0;
        background: var(--surface-color);
        box-shadow: 0 -4px 12px rgba(0,0,0,0.1);
        align-items: center;
        position: relative;
    }
    
    .message-input-form input {
        flex: 1;
        min-height: 50px;
        border-radius: 25px;
        padding: 0 16px;
        font-size: 16px;
    }
    
    .emoji-btn {
        width: 40px;
        height: 40px;
        background: none;
        border: 1px solid var(--border-color);
        border-radius: 50%;
        font-size: 20px;
        flex-shrink: 0;
    }
    
    /* Message bubble tails */
    .message.sent {
        position: relative;
    }

    .message.sent::after {
        content: '';
        position: absolute;
        bottom: 0;
        right: -8px;
        width: 0;
        height: 0;
        border: 10px solid transparent;
        border-bottom-color: var(--primary-color);
        border-right: 0;
        border-left-color: transparent;
    }

    .message.received {
        position: relative;
    }

    .message.received::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: -8px;
        width: 0;
        height: 0;
        border: 10px solid transparent;
        border-bottom-color: white;
        border-left: 0;
        border-right-color: transparent;
    }
    
    /* Smoother sidebar transition */
    .sidebar {
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    /* Floating action button for quick actions */
    .fab {
        position: fixed;
        bottom: 80px;
        right: 20px;
        width: 56px;
        height: 56px;
        background: var(--primary-color);
        color: white;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        box-shadow: 0 4px 12px rgba(0,0,0,0.2);
        z-index: 100;
        transition: transform 0.2s ease;
    }
    
    .fab:hover {
        transform: scale(1.1);
    }
}

@media (max-width: 767px) {
    .header-user-info {
        display: none;
    }
    .header-actions {
        display: none;
    }
    .header-main {
        width: 100%;
        justify-content: space-between;
    }
}

/* Reaction styles */
.reactions-container {
    display: flex;
    gap: 6px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.reaction-emoji {
    background: rgba(255, 255, 255, 0.9);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: 6px 12px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    min-width: 40px;
    min-height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.reaction-emoji:hover {
    background-color: white;
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--shadow-md);
}

.reaction-emoji:active {
    transform: translateY(0) scale(0.98);
}

.reaction-emoji.reacted {
    background: linear-gradient(135deg, #E8F0FE 0%, #D4E4FD 100%);
    border-color: var(--primary-color);
    color: var(--primary-dark);
    box-shadow: 0 2px 8px rgba(74, 144, 226, 0.3);
}

.add-reaction-btn {
    background: rgba(255, 255, 255, 0.7);
    border: 2px dashed var(--border-color);
    border-radius: 16px;
    padding: 6px 10px;
    font-size: 16px;
    cursor: pointer;
    color: var(--text-muted);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    min-width: 36px;
    min-height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.add-reaction-btn:hover {
    background-color: white;
    border-color: var(--primary-color);
    color: var(--primary-color);
    border-style: solid;
    transform: scale(1.05);
}

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

.reaction-btn {
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: background-color 0.2s;
    min-width: var(--mobile-touch-target);
    min-height: var(--mobile-touch-target);
}

.reaction-btn:hover {
    background-color: rgba(0, 0, 0, 0.1);
}

/* Reaction picker positioning */
.reaction-picker {
    position: fixed !important;
    transform: translate(-50%, -110%);
    left: 50% !important;
    bottom: auto !important;
    top: auto !important;
}

@media (max-width: 480px) {
    .reaction-picker {
        bottom: 80px !important;
        top: auto !important;
        transform: translateX(-50%);
        left: 50% !important;
        max-width: 90vw;
    }
}

/* Jump to bottom button */
.jump-to-bottom {
    position: fixed;
    bottom: 90px;
    right: 20px;
    width: 52px;
    height: 52px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: 50%;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    z-index: 100;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    animation: bounceIn 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes bounceIn {
    0% {
        transform: scale(0) rotate(-180deg);
        opacity: 0;
    }
    50% {
        transform: scale(1.1) rotate(10deg);
    }
    100% {
        transform: scale(1) rotate(0deg);
        opacity: 1;
    }
}

.jump-to-bottom.visible {
    display: flex;
}

.jump-to-bottom:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 8px 20px rgba(74, 144, 226, 0.4);
}

.jump-to-bottom:active {
    transform: translateY(-2px) scale(0.98);
}

@media (min-width: 901px) {
    .jump-to-bottom {
        bottom: 20px;
        right: 320px;
    }
}

/* Timestamp separators */
.timestamp-separator {
    text-align: center;
    margin: 24px 0;
    position: relative;
}

.timestamp-separator span {
    background: white;
    padding: 6px 16px;
    border-radius: 16px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    border: 2px solid var(--border-color);
    display: inline-block;
    box-shadow: var(--shadow-sm);
    letter-spacing: 0.5px;
}

/* Notification badge */
.notification-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: var(--error-color);
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: bold;
}

/* Connection status indicator */
.connection-status {
    position: fixed;
    top: 70px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #fc8181 0%, #f56565 100%);
    color: white;
    padding: 10px 20px;
    border-radius: 24px;
    font-size: 14px;
    font-weight: 600;
    display: none;
    align-items: center;
    gap: 10px;
    z-index: 1001;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
    animation: slideDown 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.connection-status.visible {
    display: flex;
}

.connection-status.reconnecting {
    background: linear-gradient(135deg, #a0aec0 0%, #718096 100%);
}

.connection-status.connected {
    background: linear-gradient(135deg, #68d391 0%, #48bb78 100%);
}

/* Loading spinner */
.spinner {
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top: 2px solid white;
    width: 16px;
    height: 16px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Message retry button */
.message-retry {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: var(--error-color);
    background: none;
    border: none;
    cursor: pointer;
    margin-top: 4px;
}

.message-retry:hover {
    text-decoration: underline;
}

/* Message failed indicator */
.message.failed {
    opacity: 0.6;
    border: 1px solid var(--error-color);
}

.message.failed::after {
    content: '⚠️';
    margin-left: 8px;
}

/* Unread messages indicator */
.unread-indicator {
    text-align: center;
    padding: 8px;
    background: var(--primary-color);
    color: white;
    font-size: 12px;
    font-weight: 600;
    margin: 12px 0;
    border-radius: 4px;
}

/* Theme toggle button */
.theme-toggle {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 8px 12px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Rate limit warning */
.rate-limit-warning {
    position: fixed;
    top: 70px;
    left: 50%;
    transform: translateX(-50%);
    background: #ff9800;
    color: white;
    padding: 12px 20px;
    border-radius: 8px;
    display: none;
    align-items: center;
    gap: 8px;
    z-index: 1001;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.rate-limit-warning.visible {
    display: flex;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        transform: translateX(-50%) translateY(-20px);
        opacity: 0;
    }
    to {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
}