:root {
    --primary: #0891b2;
    --primary-dark: #0e7490;
    --success: #10b981;
    --danger: #ef4444;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-800: #1f2937;
    --gray-900: #111827;
}

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

html, body {
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
}

.hidden { display: none !important; }

/* Share Button */
.share-btn {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--primary);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    z-index: 100;
    transition: all 0.3s ease;
}

.share-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* Connection Status */
.connection-status {
    position: fixed;
    top: 20px;
    left: 20px;
    background: rgba(255, 255, 255, 0.95);
    color: var(--gray-800);
    padding: 8px 16px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
    z-index: 100;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--danger);
    animation: pulse 2s infinite;
}

.connection-status.connected .status-dot {
    background: var(--success);
}

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

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    width: 100vw;
    height: 100vh;
    background: #f0f4f8;
}

/* Header */
.app-header {
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-left h1 {
    font-size: 20px;
    color: var(--gray-800);
}

.room-badge {
    background: var(--gray-100);
    color: var(--gray-800);
    padding: 6px 12px;
    border-radius: 16px;
    font-size: 12px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.node-count, .user-count {
    background: var(--gray-100);
    padding: 6px 12px;
    border-radius: 16px;
    font-size: 12px;
    color: var(--gray-800);
}

/* Toolbar */
.toolbar {
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: 8px 16px;
    display: flex;
    gap: 12px;
    align-items: center;
}

.toolbar-group {
    display: flex;
    gap: 4px;
}

.toolbar-btn {
    padding: 8px 16px;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    color: var(--gray-800);
    transition: all 0.2s ease;
}

.toolbar-btn:hover {
    background: var(--gray-100);
    border-color: var(--primary);
}

.toolbar-separator {
    width: 1px;
    height: 24px;
    background: var(--gray-200);
}

/* Canvas Container */
.canvas-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    background: #f0f4f8;
}

#mindMapCanvas {
    display: block;
    width: 100%;
    height: 100%;
    cursor: grab;
}

#mindMapCanvas.dragging {
    cursor: grabbing;
}

#mindMapCanvas.connecting {
    cursor: crosshair;
}

/* Remote Cursors */
.cursors-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10;
}

.remote-cursor {
    position: absolute;
    pointer-events: none;
    transition: transform 0.1s ease-out;
}

.remote-cursor-icon {
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-top: 12px solid currentColor;
    transform: rotate(-45deg);
}

.remote-cursor-label {
    position: absolute;
    top: 12px;
    left: 8px;
    background: currentColor;
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 11px;
    white-space: nowrap;
}

/* Context Menu */
.context-menu {
    position: fixed;
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    padding: 8px;
    z-index: 1000;
    min-width: 160px;
}

.context-menu button {
    width: 100%;
    padding: 10px 12px;
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    border-radius: 4px;
    font-size: 14px;
    color: var(--gray-800);
    transition: background 0.2s ease;
}

.context-menu button:hover {
    background: var(--gray-50);
}

/* Color Picker Dialog */
.color-picker-dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    z-index: 1001;
}

.color-picker-dialog h3 {
    margin-bottom: 16px;
    color: var(--gray-800);
}

.color-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-bottom: 16px;
}

.color-option {
    width: 50px;
    height: 50px;
    border: 3px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.color-option:hover {
    border-color: var(--gray-800);
    transform: scale(1.1);
}

.color-picker-dialog button:not(.color-option) {
    width: 100%;
    padding: 10px;
    background: var(--gray-100);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    color: var(--gray-800);
}

/* Text Edit Modal */
.text-edit-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: white;
    padding: 32px;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    min-width: 400px;
}

.modal-content h3 {
    margin-bottom: 16px;
    color: var(--gray-800);
}

.modal-content input {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--gray-200);
    border-radius: 8px;
    font-size: 16px;
    margin-bottom: 16px;
}

.modal-content input:focus {
    outline: none;
    border-color: var(--primary);
}

.modal-actions {
    display: flex;
    gap: 8px;
}

.btn-primary, .btn-secondary {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

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

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-800);
}

.btn-secondary:hover {
    background: var(--gray-200);
}

/* Users Panel */
.users-panel {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    padding: 16px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    max-width: 200px;
    z-index: 50;
}

.users-panel h3 {
    font-size: 14px;
    margin-bottom: 12px;
    color: var(--gray-800);
}

.users-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.user-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px;
    background: var(--gray-50);
    border-radius: 6px;
    font-size: 13px;
    color: var(--gray-800);
}

.user-color-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 1px solid var(--gray-800);
}

/* Instructions Overlay */
.instructions-overlay {
    position: absolute;
    top: 100px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 20px 32px;
    border-radius: 12px;
    text-align: center;
    z-index: 20;
    animation: fadeIn 0.5s ease-out;
}

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

.instructions-overlay h3 {
    margin-bottom: 12px;
}

.instructions-overlay ul {
    list-style: none;
    text-align: left;
    margin-bottom: 16px;
}

.instructions-overlay li {
    margin: 8px 0;
}

.instructions-overlay button {
    background: var(--primary);
    color: white;
    border: none;
    padding: 10px 24px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .toolbar {
        overflow-x: auto;
        padding: 8px;
    }

    .toolbar-btn {
        padding: 6px 12px;
        font-size: 12px;
    }

    .users-panel {
        bottom: 10px;
        right: 10px;
        max-width: 150px;
    }
}