:root {
    --bg: #0a0e1a;
    --bg-gradient: linear-gradient(135deg, #060914, #0a0e1a);
    --panel: #121831;
    --panel-dark: #0d1124;
    --panel-light: #1a2241;
    --accent: #4fd1c5;
    --accent-hover: #38b2ac;
    --accent-dark: #2c7a7b;
    --secondary: #63b3ed;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --text-dim: #64748b;
    --border: #1e293b;
    --border-light: #334155;
    --grid: rgba(79, 209, 197, 0.08);
    --success: #48bb78;
    --warning: #ed8936;
    --danger: #f56565;
}

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

html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-gradient);
    color: var(--text);
    -webkit-font-smoothing: antialiased;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    z-index: 200;
    background: rgba(18, 24, 49, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

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

.logo svg {
    color: var(--accent);
    stroke-width: 2.5;
}

.logo h1 {
    font-size: 20px;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin: 0;
}

.logo h1 span {
    color: var(--accent);
}

.header-controls {
    display: flex;
    gap: 10px;
}

button {
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 500;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--secondary));
    color: white;
    padding: 9px 16px;
    box-shadow: 0 2px 8px rgba(79, 209, 197, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79, 209, 197, 0.4);
}

.btn-secondary {
    background: var(--panel-light);
    color: var(--text);
    padding: 9px 16px;
    border: 1px solid var(--border-light);
}

.btn-secondary:hover {
    background: var(--panel);
    border-color: var(--accent);
}

.btn-about {
    background: transparent;
    color: var(--text);
    padding: 9px 16px;
    border: 1px solid var(--border-light);
    border-radius: 8px;
    text-decoration: none;
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-about:hover {
    background: var(--panel-light);
    border-color: var(--accent);
    color: var(--accent);
}

.btn-collab {
    background: var(--panel-light);
    color: var(--text);
    padding: 9px 16px;
    border: 1px solid var(--border-light);
    position: relative;
}

.btn-collab:hover {
    background: var(--panel);
    border-color: var(--accent);
}

.btn-collab.connected {
    border-color: var(--success);
    background: rgba(72, 187, 120, 0.1);
}

.collab-panel {
    position: fixed;
    top: 60px;
    right: -400px;
    width: 380px;
    height: calc(100vh - 60px);
    background: var(--panel-dark);
    border-left: 1px solid var(--border);
    z-index: 1000;
    transition: right 0.3s ease;
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
}

.collab-panel.active {
    right: 0;
}

.collab-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
}

.collab-header h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 700;
    color: var(--accent);
    margin: 0;
}

.close-btn {
    width: 32px;
    height: 32px;
    padding: 0;
    background: transparent;
    color: var(--text-muted);
    border: none;
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.collab-content {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.collab-section {
    margin-bottom: 24px;
}

.collab-section label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.session-id-box {
    display: flex;
    gap: 8px;
}

.session-id-box input {
    flex: 1;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 12px;
    color: var(--accent);
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    font-weight: 600;
}

.copy-btn {
    width: 40px;
    height: 40px;
    padding: 0;
    background: var(--panel-light);
    border: 1px solid var(--border);
    color: var(--text-muted);
}

.copy-btn:hover {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.join-session-box {
    display: flex;
    gap: 8px;
}

.join-session-box input {
    flex: 1;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 12px;
    color: var(--text);
    font-size: 13px;
}

.join-session-box input::placeholder {
    color: var(--text-dim);
}

.join-btn {
    padding: 10px 20px;
    background: var(--accent);
    color: white;
    border: none;
    font-weight: 600;
}

.join-btn:hover {
    background: var(--accent-hover);
}

.connected-peers {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 12px;
    min-height: 80px;
    max-height: 200px;
    overflow-y: auto;
}

.no-peers {
    color: var(--text-dim);
    font-size: 13px;
    text-align: center;
    padding: 20px;
}

.peer-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    background: var(--panel-dark);
    border-radius: 6px;
    margin-bottom: 8px;
}

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

.peer-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 14px;
}

.peer-info {
    flex: 1;
}

.peer-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
}

.peer-id {
    font-size: 11px;
    color: var(--text-dim);
    font-family: 'JetBrains Mono', monospace;
}

.collab-status {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--panel);
    border-radius: 6px;
    margin-top: auto;
}

.status-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--text-dim);
}

.status-indicator.connected {
    background: var(--success);
    box-shadow: 0 0 8px var(--success);
}

.status-indicator.connecting {
    background: var(--warning);
    animation: pulse 2s infinite;
}

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

main {
    margin-top: 60px;
    height: calc(100vh - 60px);
    display: grid;
    grid-template-columns: 1fr 360px;
    overflow: hidden;
}

.map-container {
    position: relative;
    overflow: hidden;
    background: var(--bg);
}

.map-toolbar {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    background: rgba(18, 24, 49, 0.9);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.map-toolbar::-webkit-scrollbar {
    height: 6px;
}

.map-toolbar::-webkit-scrollbar-track {
    background: var(--panel-dark);
}

.map-toolbar::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 3px;
}

.map-toolbar::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

.tool-btn {
    width: 36px;
    height: 36px;
    padding: 0;
    background: var(--panel-dark);
    color: var(--text-muted);
    border: 1px solid var(--border);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tool-btn:hover {
    background: var(--panel-light);
    color: var(--text);
    border-color: var(--accent);
}

.tool-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.divider {
    width: 1px;
    height: 24px;
    background: var(--border);
    margin: 0 4px;
}

.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
}

#colorPicker {
    width: 36px;
    height: 36px;
    border: 2px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    background: transparent;
}

.color-label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

.zoom-display {
    padding: 6px 12px;
    background: var(--panel-dark);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    color: var(--accent);
    min-width: 60px;
    text-align: center;
}

#map-viewport {
    position: relative;
    height: 100%;
    overflow: auto;
    background:
            repeating-linear-gradient(0deg, var(--grid), var(--grid) 1px, transparent 1px, transparent 50px),
            repeating-linear-gradient(90deg, var(--grid), var(--grid) 1px, transparent 1px, transparent 50px),
            radial-gradient(circle at 50% 50%, rgba(79, 209, 197, 0.05), transparent 70%);
}

#map-viewport.no-grid {
    background: var(--bg);
}

#map-world {
    position: absolute;
    top: 0;
    left: 0;
    transform-origin: 0 0;
    will-change: transform;
}

#map-image,
#draw-layer {
    position: absolute;
    top: 0;
    left: 0;
}

#draw-layer {
    cursor: crosshair;
}

.unit,
.map-text,
.marker {
    position: absolute;
    transform: translate(-50%, -50%);
    cursor: grab;
    transition: filter 0.2s ease;
}

.unit:hover,
.map-text:hover,
.marker:hover {
    filter: drop-shadow(0 0 8px var(--accent));
}

.unit:active,
.map-text:active,
.marker:active {
    cursor: grabbing;
}

.map-text {
    background: rgba(18, 24, 49, 0.95);
    border: 1px solid var(--accent);
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    white-space: nowrap;
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    user-select: none;
    -webkit-user-select: none;
    pointer-events: auto;
}

.marker {
    width: 24px;
    height: 24px;
    background: var(--accent);
    border: 3px solid white;
    border-radius: 50% 50% 50% 0;
    transform: translate(-50%, -100%) rotate(-45deg);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.marker::after {
    content: '';
    position: absolute;
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.minimap {
    position: absolute;
    bottom: 20px;
    right: 20px;
    width: 180px;
    height: 120px;
    background: rgba(18, 24, 49, 0.95);
    border: 2px solid var(--accent);
    border-radius: 8px;
    overflow: hidden;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
    z-index: 60;
}

#minimap-canvas {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

#minimap-viewport {
    position: absolute;
    border: 2px solid var(--accent);
    background: rgba(79, 209, 197, 0.2);
    pointer-events: none;
}

#sidebar {
    overflow-y: auto;
    background: linear-gradient(180deg, var(--panel-dark), var(--bg));
    border-left: 1px solid var(--border);
}

#sidebar::-webkit-scrollbar {
    width: 8px;
}

#sidebar::-webkit-scrollbar-track {
    background: var(--panel-dark);
}

#sidebar::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}

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

.sidebar-section {
    padding: 16px;
    border-bottom: 1px solid var(--border);
}

.sidebar-section h2 {
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--accent);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.sidebar-section h2 svg {
    stroke-width: 2.5;
}

.panel {
    background: var(--panel);
    border-radius: 10px;
    border: 1px solid var(--border);
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.strategy-panel {
    min-height: 200px;
}

.tabs {
    display: flex;
    gap: 6px;
    margin-bottom: 8px;
}

.tab-btn {
    flex: 1;
    padding: 8px 12px;
    background: var(--panel-dark);
    color: var(--text-muted);
    border: 1px solid var(--border);
    font-size: 13px;
    font-weight: 500;
}

.tab-btn:hover {
    background: var(--panel-light);
    color: var(--text);
}

.tab-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

textarea {
    width: 100%;
    min-height: 220px;
    background: var(--panel-dark);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    line-height: 1.6;
    resize: vertical;
}

textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(79, 209, 197, 0.1);
}

textarea::placeholder {
    color: var(--text-dim);
}

#markdown-preview {
    display: none;
    font-size: 14px;
    line-height: 1.7;
    color: var(--text);
    min-height: 220px;
    padding: 12px;
    background: var(--panel-dark);
    border-radius: 8px;
}

#markdown-preview h1,
#markdown-preview h2,
#markdown-preview h3 {
    color: var(--accent);
    margin-top: 16px;
    margin-bottom: 8px;
}

#markdown-preview h1 {
    font-size: 20px;
}

#markdown-preview h2 {
    font-size: 17px;
}

#markdown-preview h3 {
    font-size: 15px;
}

#markdown-preview ul,
#markdown-preview ol {
    margin-left: 20px;
    margin-bottom: 8px;
}

#markdown-preview code {
    background: var(--panel);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
}

#markdown-preview strong {
    color: var(--accent);
    font-weight: 600;
}

.action-btn {
    width: 100%;
    padding: 10px 14px;
    background: var(--panel-dark);
    color: var(--text);
    border: 1px solid var(--border);
    font-size: 13px;
    font-weight: 500;
    justify-content: center;
}

.action-btn:hover {
    background: var(--panel-light);
    border-color: var(--accent);
    color: var(--accent);
}

.unit-upload {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

#unit-file-input {
    display: none;
}

.file-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 14px;
    background: var(--panel-dark);
    color: var(--text);
    border: 1px dashed var(--border-light);
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.file-label:hover {
    background: var(--panel-light);
    border-color: var(--accent);
    color: var(--accent);
}

.layers-panel {
    gap: 8px;
}

.layer-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    background: var(--panel-dark);
    border-radius: 6px;
    transition: background 0.2s ease;
}

.layer-item:hover {
    background: var(--panel-light);
}

.layer-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent);
}

.layer-item label {
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    flex: 1;
}

.hint {
    font-size: 12px;
    color: var(--text-dim);
    font-style: italic;
}

footer {
    margin-top: auto;
    padding: 16px;
    border-top: 1px solid var(--border);
    background: var(--panel-dark);
}

.shortcuts {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.shortcuts strong {
    color: var(--accent);
    font-weight: 600;
}

.credits {
    font-size: 11px;
    color: var(--text-dim);
    text-align: center;
    margin-bottom: 8px;
}

.about-link {
    text-align: center;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border);
}

.about-link a {
    font-size: 12px;
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.about-link a:hover {
    color: var(--secondary);
    text-decoration: underline;
}

.about-link a::after {
    content: '→';
    font-size: 14px;
    transition: transform 0.2s ease;
}

.about-link a:hover::after {
    transform: translateX(3px);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.sidebar-section {
    animation: fadeIn 0.3s ease;
}

.map-toolbar,
.minimap {
    transform: none !important;
}

@media (max-width: 1024px) {
    main {
        grid-template-columns: 1fr 320px;
    }
}

@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
    }

    #sidebar {
        display: none;
    }

    .minimap {
        width: 140px;
        height: 90px;
    }
}