/* Modern Luxury CSS Variables */
:root {
    /* Light Theme Colors */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --primary-hover: #5a67d8;
    --secondary-color: #764ba2;
    --accent-color: #48bb78;
    --accent-hover: #38a169;
    
    /* Neutral Colors - Light */
    --background: #ffffff;
    --surface: #f8fafc;
    --surface-elevated: #ffffff;
    --border: #e2e8f0;
    --border-hover: #cbd5e0;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    
    /* Status Colors */
    --success: #48bb78;
    --warning: #ed8936;
    --error: #f56565;
    --info: #4299e1;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --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);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

/* Dark Theme Variables */
.dark-theme {
    --background: #0f0f23;
    --surface: #1a1a2e;
    --surface-elevated: #16213e;
    --border: #2d3748;
    --border-hover: #4a5568;
    --text-primary: #f7fafc;
    --text-secondary: #e2e8f0;
    --text-muted: #a0aec0;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-weight: var(--font-weight-normal);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background);
    transition: background-color var(--transition-normal), color var(--transition-normal);
    overflow-x: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb {
    background: var(--border-hover);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast);
}

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

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-content {
    text-align: center;
    color: white;
}

.loading-logo {
    margin-bottom: var(--space-xl);
}

.loading-logo i {
    font-size: 4rem;
    margin-bottom: var(--space-md);
    display: block;
}

.loading-logo h1 {
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-sm);
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-lg);
}

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

/* App Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--background);
}

/* Header */
.app-header {
    background: var(--surface-elevated);
    border-bottom: 1px solid var(--border);
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

.header-left .logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    color: var(--primary-color);
}

.header-left .logo i {
    font-size: 1.5rem;
}

.header-center .room-info {
    text-align: center;
}

.room-name {
    display: block;
    font-size: 1.1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

.user-count {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.theme-toggle,
.settings-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-toggle:hover,
.settings-btn:hover {
    background: var(--surface);
    color: var(--primary-color);
    transform: translateY(-1px);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    min-height: 0;
}

/* Sidebar */
.sidebar {
    width: 300px;
    background: var(--surface);
    border-right: 1px solid var(--border);
    padding: var(--space-lg);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.sidebar-section h3 {
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.sidebar-section h3 i {
    color: var(--primary-color);
}

/* Participants List */
.participants-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.participant {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    transition: all var(--transition-fast);
}

.participant:hover {
    border-color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.participant-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: var(--font-weight-semibold);
    font-size: 0.875rem;
}

.participant-info {
    flex: 1;
}

.participant-name {
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    font-size: 0.875rem;
}

.participant-status {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.participant-voice-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Voice Controls */
.voice-controls {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.voice-btn {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
    background: var(--surface-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.voice-btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.join-voice {
    background: var(--success);
    color: white;
    border-color: var(--success);
}

.join-voice:hover:not(:disabled) {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

.mute-btn.muted {
    background: var(--warning);
    color: white;
    border-color: var(--warning);
}

.leave-voice {
    background: var(--error);
    color: white;
    border-color: var(--error);
}

.voice-status {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: var(--surface-elevated);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success);
}

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

/* Chat Area */
.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

/* Messages Container */
.messages-container {
    flex: 1;
    padding: var(--space-lg);
    overflow-y: auto;
    background: var(--background);
}

.welcome-message {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--text-secondary);
}

.welcome-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: var(--space-lg);
}

.welcome-message h2 {
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

/* Message Styles */
.message {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    animation: slideInUp 0.3s ease-out;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: var(--font-weight-semibold);
    font-size: 0.875rem;
    flex-shrink: 0;
}

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

.message-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xs);
}

.message-author {
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    font-size: 0.875rem;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.message-text {
    color: var(--text-primary);
    line-height: 1.5;
    word-wrap: break-word;
}

.message.own {
    flex-direction: row-reverse;
}

.message.own .message-content {
    text-align: right;
}

.message.own .message-avatar {
    background: var(--accent-color);
}

/* System Messages */
.system-message {
    text-align: center;
    margin: var(--space-lg) 0;
    padding: var(--space-sm) var(--space-md);
    background: var(--surface);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    color: var(--text-muted);
    border: 1px solid var(--border);
}

/* Message Input */
.message-input-container {
    padding: var(--space-lg);
    background: var(--surface-elevated);
    border-top: 1px solid var(--border);
}

.message-input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--background);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-sm);
    transition: border-color var(--transition-fast);
}

.message-input-wrapper:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.emoji-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

#message-input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    font-size: 1rem;
    color: var(--text-primary);
    padding: var(--space-sm);
}

#message-input::placeholder {
    color: var(--text-muted);
}

.send-btn {
    background: var(--primary-color);
    border: none;
    color: white;
    font-size: 1.1rem;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.send-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.input-status {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--space-sm);
    font-size: 0.75rem;
    color: var(--text-muted);
}

#typing-indicator {
    font-style: italic;
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.modal {
    background: var(--surface-elevated);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow: hidden;
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

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

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.modal-header h2 i {
    color: var(--primary-color);
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.close-btn:hover {
    background: var(--surface);
    color: var(--text-primary);
}

.modal-content {
    padding: var(--space-lg);
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

#username-input {
    width: 100%;
    padding: var(--space-md);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: var(--background);
    color: var(--text-primary);
    transition: border-color var(--transition-fast);
}

#username-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.username-suggestions {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    flex-wrap: wrap;
}

.suggestion {
    padding: var(--space-xs) var(--space-sm);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--text-secondary);
}

.suggestion:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.modal-footer {
    padding: var(--space-lg);
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
}

.primary-btn {
    background: var(--primary-gradient);
    border: none;
    color: white;
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.primary-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.primary-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Global Room Option */
.global-room-option {
    margin-bottom: var(--space-lg);
    padding: var(--space-lg);
    background: linear-gradient(135deg, #667eea22, #764ba222);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    text-align: center;
}

.global-room-banner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.global-room-banner i {
    font-size: 2rem;
    color: var(--primary-color);
}

.global-room-banner h4 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.global-room-banner p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.global-join-btn {
    width: 100%;
    margin-top: var(--space-sm);
}

/* Room Modal Styles */
.room-tabs {
    display: flex;
    margin-bottom: var(--space-lg);
    border-bottom: 1px solid var(--border);
}

.tab-btn {
    flex: 1;
    padding: var(--space-md);
    background: none;
    border: none;
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
    border-bottom: 2px solid transparent;
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-btn:hover {
    color: var(--text-primary);
    background: var(--surface);
}

.tab-content {
    display: none;
}

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

#room-code-input,
#room-name-input {
    width: 100%;
    padding: var(--space-md);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: var(--background);
    color: var(--text-primary);
    transition: border-color var(--transition-fast);
    margin-bottom: var(--space-lg);
}

#room-code-input:focus,
#room-name-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.room-code {
    background: var(--surface);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-family: 'Courier New', monospace;
    margin-left: var(--space-sm);
}

/* Settings Modal */
.settings-section {
    margin-bottom: var(--space-xl);
}

.settings-section:last-child {
    margin-bottom: 0;
}

.settings-section h3 {
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-md);
    gap: var(--space-md);
}

.setting-item:last-child {
    margin-bottom: 0;
}

.setting-item label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.setting-item select,
.setting-item input[type="range"] {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    padding: var(--space-sm);
}

.setting-item input[type="checkbox"] {
    accent-color: var(--primary-color);
}

/* Notifications */
.notification-container {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.notification {
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    box-shadow: var(--shadow-lg);
    min-width: 300px;
    animation: notificationSlideIn 0.3s ease-out;
    position: relative;
    overflow: hidden;
}

.notification.show {
    opacity: 1;
    transform: translateX(0);
}

.notification.hide {
    opacity: 0;
    transform: translateX(100%);
    transition: all 0.3s ease-out;
}

.notification::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-color);
}

.notification.success::before {
    background: var(--success);
}

.notification.error::before {
    background: var(--error);
}

.notification.warning::before {
    background: var(--warning);
}

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

.notification-content {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.notification-icon {
    font-size: 1.2rem;
    color: var(--primary-color);
}

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

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

.notification.warning .notification-icon {
    color: var(--warning);
}

.notification-text {
    flex: 1;
    color: var(--text-primary);
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        top: 0;
        left: -100%;
        height: 100%;
        z-index: 200;
        transition: left var(--transition-normal);
        width: 280px;
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .main-content {
        flex-direction: column;
    }
    
    .chat-area {
        width: 100%;
    }
    
    .app-header {
        padding: var(--space-sm) var(--space-md);
    }
    
    .header-center {
        display: none;
    }
    
    .modal {
        margin: var(--space-md);
    }
    
    .notification-container {
        top: var(--space-sm);
        right: var(--space-sm);
        left: var(--space-sm);
    }
    
    .notification {
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .messages-container {
        padding: var(--space-md);
    }
    
    .message-input-container {
        padding: var(--space-md);
    }
    
    .sidebar {
        width: 100%;
        left: -100%;
    }
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --shadow-sm: none;
        --shadow-md: none;
        --shadow-lg: none;
        --shadow-xl: none;
    }
    
    .message-input-wrapper:focus-within {
        box-shadow: none;
        border-width: 3px;
    }
}

/* Focus Styles for Accessibility */
button:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .sidebar,
    .message-input-container,
    .app-header {
        display: none;
    }
    
    .messages-container {
        padding: 0;
    }
    
    .message {
        break-inside: avoid;
    }
}