:root {
    /* Color Scheme - Brutalist Terminal */
    --bg-primary: #0a0a0a;
    --bg-secondary: #151515;
    --bg-tertiary: #1a1a1a;
    --accent-primary: #00ff41;
    --accent-secondary: #ff0080;
    --accent-warning: #ffff00;
    --text-primary: #e0e0e0;
    --text-secondary: #808080;
    --text-muted: #404040;
    --border-color: #252525;
    --border-accent: #00ff41;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Typography */
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    --font-display: 'Space Mono', monospace;
    
    /* Animations */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-mono);
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
}

/* Scanline Effect */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        0deg,
        rgba(0, 0, 0, 0.15),
        rgba(0, 0, 0, 0.15) 1px,
        transparent 1px,
        transparent 2px
    );
    pointer-events: none;
    z-index: 9999;
    opacity: 0.3;
}

/* App Container */
#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border-bottom: 2px solid var(--border-accent);
    box-shadow: 0 0 20px rgba(0, 255, 65, 0.2);
    position: relative;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.logo {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -1px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.logo-bracket {
    color: var(--accent-primary);
    text-shadow: 0 0 10px rgba(0, 255, 65, 0.5);
    animation: pulse 2s ease-in-out infinite;
}

.logo-text {
    color: var(--text-primary);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.session-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    font-size: 12px;
}

.session-label {
    color: var(--text-secondary);
    font-weight: 700;
}

.session-id {
    color: var(--accent-primary);
    font-family: var(--font-display);
}

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

.user-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
}

.user-color {
    width: 12px;
    height: 12px;
    border-radius: 2px;
    background: var(--accent-primary);
    box-shadow: 0 0 8px currentColor;
}

.user-name {
    font-size: 13px;
    font-weight: 700;
}

.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: transparent;
    border: 2px solid var(--accent-primary);
    color: var(--accent-primary);
    font-family: var(--font-display);
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--accent-primary);
    transition: left var(--transition-normal);
    z-index: -1;
}

.btn:hover::before {
    left: 0;
}

.btn:hover {
    color: var(--bg-primary);
    box-shadow: 0 0 20px rgba(0, 255, 65, 0.4);
}

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

/* Main Container */
.main-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 300px;
    background: var(--bg-secondary);
    border-right: 2px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.sidebar-section {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.sidebar-title {
    font-family: var(--font-display);
    font-size: 11px;
    font-weight: 700;
    color: var(--accent-primary);
    letter-spacing: 2px;
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
}

.users-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.user-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border-left: 3px solid;
    font-size: 13px;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.user-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    box-shadow: 0 0 8px currentColor;
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

.info-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    font-size: 12px;
}

.info-label {
    color: var(--text-secondary);
    font-weight: 700;
}

.info-value {
    color: var(--accent-primary);
    font-family: var(--font-display);
}

.operations-log {
    max-height: 200px;
    overflow-y: auto;
    font-size: 11px;
    line-height: 1.6;
}

.log-entry {
    padding: var(--spacing-xs);
    color: var(--text-secondary);
    border-left: 2px solid var(--border-color);
    padding-left: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    animation: logFadeIn 0.3s ease-out;
}

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

.log-entry:last-child {
    color: var(--accent-primary);
    border-left-color: var(--accent-primary);
}

/* Editor Container */
.editor-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
}

.editor-toolbar {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.toolbar-select {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 12px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.toolbar-select:hover {
    border-color: var(--accent-primary);
}

.toolbar-select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 8px rgba(0, 255, 65, 0.3);
}

.toolbar-divider {
    width: 1px;
    height: 20px;
    background: var(--border-color);
}

.toolbar-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 16px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.toolbar-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.toolbar-btn:active {
    transform: scale(0.9);
}

.connection-status {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    animation: blink 2s ease-in-out infinite;
}

.status-online {
    background: var(--accent-primary);
    box-shadow: 0 0 8px var(--accent-primary);
}

.status-offline {
    background: var(--accent-secondary);
    box-shadow: 0 0 8px var(--accent-secondary);
}

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

.status-text {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-secondary);
}

/* Editor Wrapper */
.editor-wrapper {
    flex: 1;
    display: flex;
    overflow: hidden;
    position: relative;
}

.line-numbers {
    padding: var(--spacing-lg) var(--spacing-md);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-muted);
    user-select: none;
    text-align: right;
    min-width: 50px;
}

.editor-content {
    flex: 1;
    position: relative;
    overflow: auto;
}

.editor-textarea {
    width: 100%;
    height: 100%;
    padding: var(--spacing-lg);
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.6;
    resize: none;
    outline: none;
    caret-color: var(--accent-primary);
}

.editor-textarea::selection {
    background: rgba(0, 255, 65, 0.3);
}

.cursors-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    padding: var(--spacing-lg);
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.6;
}

.remote-cursor {
    position: absolute;
    width: 2px;
    height: 20px;
    animation: cursorBlink 1s ease-in-out infinite;
}

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

.cursor-label {
    position: absolute;
    top: -20px;
    left: 0;
    padding: 2px 6px;
    background: currentColor;
    color: var(--bg-primary);
    font-size: 10px;
    font-weight: 700;
    white-space: nowrap;
    border-radius: 2px;
}

/* Editor Footer */
.editor-footer {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-xs) var(--spacing-lg);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    font-size: 11px;
}

.footer-item {
    display: flex;
    gap: var(--spacing-xs);
}

.footer-label {
    color: var(--text-secondary);
    font-weight: 700;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
    animation: fadeIn 0.2s ease-out;
}

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

.modal-content {
    background: var(--bg-secondary);
    border: 2px solid var(--accent-primary);
    box-shadow: 0 0 40px rgba(0, 255, 65, 0.3);
    max-width: 500px;
    width: 90%;
    animation: scaleIn 0.3s ease-out;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

.modal-header h2 {
    font-family: var(--font-display);
    font-size: 16px;
    color: var(--accent-primary);
    letter-spacing: 2px;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 28px;
    cursor: pointer;
    line-height: 1;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    color: var(--accent-primary);
    transform: rotate(90deg);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-text {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-size: 13px;
}

.share-link-container {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.share-link-input {
    flex: 1;
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 12px;
}

.share-link-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 8px rgba(0, 255, 65, 0.3);
}

.btn-copy {
    padding: var(--spacing-md) var(--spacing-lg);
    white-space: nowrap;
}

.modal-hint {
    color: var(--text-muted);
    font-size: 11px;
    font-style: italic;
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 0;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        display: none;
    }
    
    .header-left {
        gap: var(--spacing-md);
    }
    
    .session-info {
        display: none;
    }
}