/* ========== PAPERPOOL CHAT STYLES ========== */

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #000000;
    --secondary-color: #ffffff;
    --accent-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --success-color: #10b981;
    --info-color: #3b82f6;
    
    --text-primary: #000000;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --bg-dark: #000000;
    
    --border-color: #e5e7eb;
    --border-light: #f3f4f6;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    --transition: all 0.2s ease-in-out;
    --transition-fast: all 0.15s ease-in-out;
    --transition-slow: all 0.3s ease-in-out;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

#particles-js {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1000;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    cursor: pointer;
    display: none;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.mobile-menu-btn:hover {
    background: var(--bg-secondary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.menu-bar {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    margin: 4px 0;
    transition: var(--transition);
    border-radius: 1px;
}

.mobile-menu-btn.active .menu-bar:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active .menu-bar:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active .menu-bar:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Chat Container */
.chat-container {
    display: flex;
    min-height: 100vh;
    background: var(--bg-primary);
}

/* Sidebar Styles */
.sidebar {
    width: 280px;
    background: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 100;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
}

@media (min-width: 1024px) {
    .sidebar {
        position: fixed;
        transform: translateX(0);
        box-shadow: var(--shadow-lg);
        width: 280px;
    }
}

.sidebar.active {
    transform: translateX(0);
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--bg-dark);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-primary);
    font-size: 1.25rem;
    font-weight: 700;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
}

.sidebar-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.sidebar-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.sidebar-user {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.user-avatar-container {
    display: flex;
    justify-content: center;
    margin-bottom: 1rem;
}

.user-avatar {
    position: relative;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
}

.user-avatar:hover {
    transform: scale(1.05);
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-status {
    position: absolute;
    bottom: 4px;
    right: 4px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 2px solid var(--bg-primary);
}

.user-status.online {
    background: var(--success-color);
}

.avatar-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-primary);
    opacity: 0;
    transition: var(--transition);
}

.user-avatar:hover .avatar-overlay {
    opacity: 1;
}

.user-name {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 0.25rem;
}

.user-university {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 1rem;
}

.user-level {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.level-badge {
    background: var(--bg-dark);
    color: var(--bg-primary);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.level-progress {
    flex: 1;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    overflow: hidden;
}

.level-bar {
    height: 100%;
    background: var(--accent-color);
    border-radius: 2px;
    transition: var(--transition);
}

.sidebar-menu {
    list-style: none;
    padding: 1rem 0;
    flex: 1;
    overflow-y: auto;
}

.menu-item {
    margin: 0.25rem 0;
}

.menu-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    margin-right: 1rem;
}

.menu-link:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.menu-item.active .menu-link {
    background: var(--bg-dark);
    color: var(--bg-primary);
}

.menu-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.menu-text {
    flex: 1;
    font-weight: 500;
}

.menu-badge {
    background: var(--accent-color);
    color: var(--bg-primary);
    padding: 0.125rem 0.5rem;
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    min-width: 20px;
    text-align: center;
}

.menu-badge.transfer-badge {
    background: var(--success-color);
}

.menu-badge.chat-badge {
    background: var(--danger-color);
}

.menu-badge.coming-soon {
    background: var(--warning-color);
}

.menu-indicator {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 0;
    background: var(--accent-color);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    transition: var(--transition);
}

.menu-item.active .menu-indicator {
    height: 24px;
}

.sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.credit-widget {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 1rem;
    margin-bottom: 1rem;
    position: relative;
    overflow: hidden;
}

.credit-widget::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), var(--success-color));
}

.credit-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.credit-icon {
    color: var(--accent-color);
    font-size: 1.25rem;
}

.credit-info {
    flex: 1;
}

.credit-amount {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.credit-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.credit-actions .btn-credit-buy {
    width: 100%;
    background: var(--bg-dark);
    color: var(--bg-primary);
    border: none;
    padding: 0.75rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-credit-buy:hover {
    background: var(--text-primary);
    transform: translateY(-1px);
}

.logout-btn {
    width: 100%;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

/* Mobile Backdrop */
.mobile-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 50;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.mobile-backdrop.active {
    opacity: 1;
    visibility: visible;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 280px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background: var(--bg-primary);
    position: relative;
    z-index: 1;
    overflow-x: hidden;
}

@media (max-width: 1023px) {
    .main-content {
        margin-left: 0 !important;
        width: 100%;
        position: relative;
        z-index: 1;
    }
}

/* Chat Header */
.chat-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
    position: sticky;
    top: 0;
    z-index: 10;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.mobile-menu-trigger {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
    display: none;
}

@media (max-width: 1023px) {
    .mobile-menu-trigger {
        display: block;
    }
}

.mobile-menu-trigger:hover {
    background: var(--bg-secondary);
}

.welcome-section h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.greeting {
    background: linear-gradient(135deg, var(--text-primary), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header-widgets {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.credits-display {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
}

.credits-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.credits-data {
    text-align: center;
}

.credits-amount {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.credits-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Chat Content */
.chat-content {
    display: grid;
    grid-template-columns: 350px 1fr;
    flex: 1;
    height: calc(100vh - 80px);
}

@media (max-width: 1023px) {
    .chat-content {
        grid-template-columns: 1fr;
        height: calc(100vh - 80px);
    }
}

/* Conversations Panel */
.conversations-panel {
    background: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

@media (max-width: 1023px) {
    .conversations-panel {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
}

.panel-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-secondary);
}

.panel-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Search Section */
.search-section {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.search-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.search-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.search-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.search-results {
    margin-top: 1rem;
    max-height: 300px;
    overflow-y: auto;
}

.user-result {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 0.75rem;
    background: var(--bg-primary);
    transition: var(--transition);
}

.user-result:hover {
    border-color: var(--accent-color);
    box-shadow: var(--shadow-sm);
}

.user-result .user-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
}

.user-result .user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-result .user-info {
    flex: 1;
}

.user-result .user-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.user-result .user-school {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.125rem;
}

.user-result .user-join-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Conversations List */
.conversations-list {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    scroll-behavior: smooth;
}

.conversations-list::-webkit-scrollbar {
    width: 6px;
}

.conversations-list::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 3px;
}

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

.conversations-list::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

.conversations-empty {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.conversations-empty h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.conversations-empty p {
    margin-bottom: 1.5rem;
}

.conversation-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 0.5rem;
    position: relative;
}

.conversation-item:hover {
    background: var(--bg-secondary);
}

.conversation-item.active {
    background: var(--bg-dark);
    color: var(--bg-primary);
}

.conversation-avatar {
    position: relative;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
}

.conversation-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.online-indicator {
    position: absolute;
    bottom: 2px;
    right: 2px;
    width: 12px;
    height: 12px;
    background: var(--success-color);
    border-radius: 50%;
    border: 2px solid var(--bg-primary);
}

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

.conversation-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.25rem;
}

.conversation-name {
    font-size: 0.875rem;
    font-weight: 600;
    color: inherit;
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-time {
    font-size: 0.75rem;
    color: inherit;
    opacity: 0.7;
    flex-shrink: 0;
}

.conversation-preview {
    font-size: 0.75rem;
    color: inherit;
    opacity: 0.7;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-badge {
    background: var(--danger-color);
    color: var(--bg-primary);
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    flex-shrink: 0;
}

/* Chat Window */
.chat-window {
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chat-empty {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem;
}

.chat-empty .empty-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    opacity: 0.3;
}

.chat-empty h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.chat-empty p {
    font-size: 1rem;
    max-width: 400px;
}

/* Chat Interface */
.chat-container {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.chat-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.chat-contact-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.contact-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
}

.contact-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.contact-details {
    display: flex;
    flex-direction: column;
}

.contact-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.contact-status {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.chat-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    scroll-behavior: smooth;
}

.chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 3px;
}

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

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

.message {
    display: flex;
    margin-bottom: 1rem;
}

.message.sent {
    justify-content: flex-end;
}

.message.received {
    justify-content: flex-start;
}

.message-content {
    max-width: 70%;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-lg);
    position: relative;
}

.message.sent .message-content {
    background: var(--bg-dark);
    color: var(--bg-primary);
    border-bottom-right-radius: var(--radius-sm);
}

.message.received .message-content {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-bottom-left-radius: var(--radius-sm);
}

.message-text {
    font-size: 0.875rem;
    line-height: 1.5;
    margin-bottom: 0.25rem;
    word-wrap: break-word;
}

.message-time {
    font-size: 0.75rem;
    opacity: 0.7;
    text-align: right;
}

.chat-input-section {
    border-top: 1px solid var(--border-color);
    background: var(--bg-primary);
}

.message-disclaimer {
    padding: 0.75rem 1.5rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
}

.chat-input-container {
    padding: 1rem 1.5rem;
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 0.75rem;
    transition: var(--transition);
}

.input-wrapper:focus-within {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.input-wrapper textarea {
    flex: 1;
    border: none;
    background: none;
    resize: none;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--text-primary);
    min-height: 20px;
    max-height: 120px;
    outline: none;
}

.input-wrapper textarea::placeholder {
    color: var(--text-muted);
}

.input-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}

.char-counter {
    font-size: 0.75rem;
    color: var(--text-muted);
    min-width: 50px;
    text-align: right;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--bg-dark);
    color: var(--bg-primary);
}

.btn-primary:hover:not(:disabled) {
    background: var(--text-primary);
    transform: translateY(-1px);
}

.btn-primary:disabled {
    background: var(--text-muted);
}

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

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

.btn-ghost {
    background: none;
    color: var(--text-secondary);
    border: 1px solid transparent;
}

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

.btn-danger {
    background: var(--danger-color);
    color: var(--bg-primary);
}

.btn-danger:hover {
    background: #dc2626;
}

.btn-small {
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem;
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    position: relative;
    z-index: 1;
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
}

.modal-body p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.75rem;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    backdrop-filter: blur(4px);
}

.loading-spinner {
    text-align: center;
    color: var(--text-primary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--bg-tertiary);
    border-top: 4px solid var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

.loading-spinner p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-width: 400px;
}

.toast {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1rem;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    animation: slideIn 0.3s ease-out;
    max-width: 400px;
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--danger-color);
}

.toast.info {
    border-left: 4px solid var(--info-color);
}

.toast-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.toast.success .toast-icon {
    color: var(--success-color);
}

.toast.error .toast-icon {
    color: var(--danger-color);
}

.toast.info .toast-icon {
    color: var(--info-color);
}

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

.toast-message {
    font-size: 0.875rem;
    color: var(--text-primary);
    line-height: 1.4;
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    flex-shrink: 0;
}

.toast-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Responsive Design */
@media (min-width: 1024px) {
    .sidebar {
        position: fixed;
        transform: translateX(0);
        box-shadow: var(--shadow-lg);
        width: 280px;
    }

    .main-content {
        margin-left: 280px;
    }

    .mobile-menu-trigger {
        display: none;
    }

    .sidebar-close {
        display: none;
    }

    .mobile-backdrop {
        display: none;
    }

    .mobile-menu-btn {
        display: none;
    }
}

@media (max-width: 1023px) {
    .chat-content {
        grid-template-columns: 1fr;
        height: calc(100vh - 80px);
    }

    .sidebar-close {
        display: block;
    }

    .chat-header {
        padding: 0.75rem 1rem;
    }

    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .header-widgets {
        width: 100%;
        justify-content: space-between;
    }

    .mobile-menu-btn {
        display: block;
    }
}

@media (max-width: 768px) {
    .main-content {
        margin-left: 0 !important;
        width: 100%;
        position: relative;
        z-index: 1;
    }
    
    .chat-content {
        grid-template-columns: 1fr;
    }

    .conversations-panel {
        display: none;
    }

    .conversations-panel.active {
        display: flex;
    }

    .chat-window {
        display: none;
    }

    .chat-window.active {
        display: flex;
    }

    .chat-header {
        padding: 0.75rem 1rem;
    }

    .chat-messages {
        padding: 0.75rem;
    }

    .chat-input-container {
        padding: 0.75rem 1rem;
    }

    .modal-content {
        margin: 1rem;
        max-height: calc(100vh - 2rem);
    }

    .toast-container {
        left: 1rem;
        right: 1rem;
        max-width: none;
    }

    .toast {
        max-width: none;
    }
}

@media (max-width: 480px) {
    .main-content {
        margin-left: 0 !important;
        width: 100%;
        position: relative;
        z-index: 1;
    }
    
    .chat-content {
        height: calc(100vh - 70px);
    }

    .chat-header {
        padding: 0.5rem 0.75rem;
    }

    .chat-messages {
        padding: 0.5rem;
    }

    .chat-input-container {
        padding: 0.5rem 0.75rem;
    }

    .message-content {
        max-width: 85%;
    }

    .conversation-item {
        padding: 0.75rem;
    }

    .conversation-avatar {
        width: 40px;
        height: 40px;
    }

    .user-result {
        padding: 0.75rem;
    }

    .user-result .user-avatar {
        width: 40px;
        height: 40px;
    }
}