* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
}

body {
    background: #1a1a2e;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #fff;
    overflow: hidden;
}

/* Top Bar */
.top-bar {
    background: linear-gradient(180deg, rgba(30,30,50,0.98) 0%, rgba(20,20,40,0.95) 100%);
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid #4a9eff;
    z-index: 100;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

.resources {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.resource {
    display: flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
    padding: 6px 14px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.1);
    font-size: 13px;
}

.resource-icon {
    width: 18px;
    height: 18px;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.resource-icon.iron { background: linear-gradient(135deg, #a8b5c9 0%, #7a8599 100%); }
.resource-icon.copper { background: linear-gradient(135deg, #e8c49a 0%, #c4956a 100%); }
.resource-icon.coal { background: linear-gradient(135deg, #444 0%, #222 100%); border: 1px solid #555; }
.resource-icon.iron-plate { background: linear-gradient(135deg, #c8d5e9 0%, #a8b5c9 100%); }
.resource-icon.copper-plate { background: linear-gradient(135deg, #f8d4aa 0%, #d4a574 100%); }
.resource-icon.gear { background: linear-gradient(135deg, #9aa5b9 0%, #6a7589 100%); border-radius: 50%; }
.resource-icon.circuit { background: linear-gradient(135deg, #6abfff 0%, #3a8fcc 100%); }

.title-section {
    display: flex;
    align-items: center;
    gap: 15px;
}

.game-title {
    color: #4a9eff;
    font-size: 18px;
    font-weight: bold;
    text-shadow: 0 0 10px rgba(74,158,255,0.5);
}

.menu-buttons {
    display: flex;
    gap: 8px;
}

.menu-btn {
    padding: 6px 12px;
    background: linear-gradient(135deg, rgba(74,158,255,0.3) 0%, rgba(74,158,255,0.1) 100%);
    border: 1px solid rgba(74,158,255,0.5);
    border-radius: 4px;
    color: #fff;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.2s;
}

.menu-btn:hover {
    background: linear-gradient(135deg, rgba(74,158,255,0.5) 0%, rgba(74,158,255,0.3) 100%);
    box-shadow: 0 0 10px rgba(74,158,255,0.3);
}

/* Game Area */
.game-area {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.canvas-container {
    flex: 1;
    position: relative;
    overflow: hidden;
}

#game-canvas {
    position: absolute;
    top: 0;
    left: 0;
    cursor: crosshair;
}

/* Toolbar */
.toolbar {
    background: linear-gradient(90deg, rgba(20,20,40,0.98) 0%, rgba(30,30,50,0.95) 100%);
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    border-left: 2px solid #4a9eff;
    width: 200px;
    overflow-y: auto;
}

.toolbar h3 {
    color: #4a9eff;
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 8px;
    margin-bottom: 2px;
    text-shadow: 0 0 10px rgba(74,158,255,0.3);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 4px 6px;
    background: rgba(255,255,255,0.03);
    border-radius: 4px;
    transition: background 0.2s;
}

.toolbar h3:hover {
    background: rgba(255,255,255,0.08);
}

.toolbar h3:first-child {
    margin-top: 0;
}

.toolbar h3::after {
    content: '▼';
    font-size: 8px;
    transition: transform 0.2s;
}

.toolbar h3.collapsed::after {
    transform: rotate(-90deg);
}

.tool-category {
    display: flex;
    flex-direction: column;
    gap: 3px;
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.2s;
    max-height: 500px;
    opacity: 1;
}

.tool-category.collapsed {
    max-height: 0;
    opacity: 0;
    margin: 0;
}

.tool-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px;
    background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.02) 100%);
    border: 2px solid transparent;
    border-radius: 4px;
    color: #fff;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 11px;
}

.tool-btn:hover {
    background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
    transform: translateX(2px);
}

.tool-btn.active {
    border-color: #4a9eff;
    background: linear-gradient(135deg, rgba(74,158,255,0.3) 0%, rgba(74,158,255,0.1) 100%);
    box-shadow: 0 0 10px rgba(74,158,255,0.2);
}

.tool-btn.disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.tool-btn .icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    font-size: 12px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.3);
    flex-shrink: 0;
}

.tool-btn .icon.select { background: linear-gradient(135deg, #666 0%, #444 100%); }
.tool-btn .icon.delete { background: linear-gradient(135deg, #ff4466 0%, #cc1133 100%); }
.tool-btn .icon.mine { background: linear-gradient(135deg, #88cc44 0%, #558822 100%); }
.tool-btn .icon.miner { background: linear-gradient(135deg, #ffaa33 0%, #cc7700 100%); }
.tool-btn .icon.belt { background: linear-gradient(135deg, #888 0%, #555 100%); }
.tool-btn .icon.inserter { background: linear-gradient(135deg, #ffdd44 0%, #ccaa00 100%); }
.tool-btn .icon.furnace { background: linear-gradient(135deg, #ff6644 0%, #cc3311 100%); }
.tool-btn .icon.assembler { background: linear-gradient(135deg, #55bbff 0%, #2288cc 100%); }
.tool-btn .icon.chest { background: linear-gradient(135deg, #aa7744 0%, #664422 100%); }
.tool-btn .icon.gun_turret { background: linear-gradient(135deg, #888899 0%, #555566 100%); }
.tool-btn .icon.flame_turret { background: linear-gradient(135deg, #ff6600 0%, #cc3300 100%); }
.tool-btn .icon.laser_turret { background: linear-gradient(135deg, #ff4466 0%, #cc1133 100%); }
.tool-btn .icon.tesla_turret { background: linear-gradient(135deg, #44aaff 0%, #2266cc 100%); }
.tool-btn .icon.cannon_turret { background: linear-gradient(135deg, #555566 0%, #333344 100%); }

.resource-icon.xp { background: linear-gradient(135deg, #ffdd44 0%, #cc9900 100%); }

.tool-info {
    flex: 1;
    min-width: 0;
}

.tool-info .name {
    font-weight: bold;
    font-size: 10px;
}

.tool-info .cost {
    font-size: 9px;
    color: #888;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.tool-info .hotkey {
    font-size: 8px;
    color: #4a9eff;
}

.instructions {
    margin-top: auto;
    padding: 8px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 4px;
    font-size: 9px;
    line-height: 1.5;
    border: 1px solid rgba(255,255,255,0.05);
}

.instructions kbd {
    background: #333;
    padding: 1px 4px;
    border-radius: 2px;
    border: 1px solid #555;
    font-size: 8px;
}

.game-speed {
    display: flex;
    gap: 3px;
    margin-top: 6px;
}

.speed-btn {
    flex: 1;
    padding: 4px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 3px;
    color: #fff;
    cursor: pointer;
    font-size: 9px;
    transition: all 0.2s;
}

.speed-btn:hover {
    background: rgba(255, 255, 255, 0.15);
}

.speed-btn.active {
    background: linear-gradient(135deg, #4a9eff 0%, #2266cc 100%);
    border-color: #4a9eff;
}

/* Tooltip */
.tooltip {
    position: absolute;
    background: linear-gradient(135deg, rgba(20,20,40,0.98) 0%, rgba(30,30,50,0.95) 100%);
    border: 1px solid #4a9eff;
    padding: 12px;
    border-radius: 8px;
    font-size: 12px;
    pointer-events: none;
    z-index: 1000;
    max-width: 220px;
    display: none;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

/* Recipe Select */
.recipe-select {
    position: absolute;
    background: linear-gradient(135deg, rgba(20,20,40,0.98) 0%, rgba(30,30,50,0.95) 100%);
    border: 2px solid #4a9eff;
    padding: 15px;
    border-radius: 8px;
    z-index: 1000;
    display: none;
    box-shadow: 0 4px 30px rgba(0,0,0,0.6);
}

.recipe-select h4 {
    margin-bottom: 10px;
    color: #4a9eff;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.recipe-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    cursor: pointer;
    border-radius: 4px;
    font-size: 12px;
    transition: all 0.2s;
}

.recipe-option:hover {
    background: rgba(74,158,255,0.2);
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.modal {
    background: linear-gradient(135deg, rgba(30,30,60,0.98) 0%, rgba(20,20,50,0.98) 100%);
    border: 2px solid #4a9eff;
    border-radius: 12px;
    padding: 30px;
    min-width: 350px;
    box-shadow: 0 0 50px rgba(74,158,255,0.3);
}

.modal h2 {
    color: #4a9eff;
    margin-bottom: 20px;
    text-align: center;
}

.modal-btn {
    width: 100%;
    padding: 12px;
    margin: 8px 0;
    background: linear-gradient(135deg, rgba(74,158,255,0.3) 0%, rgba(74,158,255,0.1) 100%);
    border: 1px solid rgba(74,158,255,0.5);
    border-radius: 6px;
    color: #fff;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.modal-btn:hover {
    background: linear-gradient(135deg, rgba(74,158,255,0.5) 0%, rgba(74,158,255,0.3) 100%);
    box-shadow: 0 0 15px rgba(74,158,255,0.3);
}

.modal-btn.danger {
    background: linear-gradient(135deg, rgba(255,68,102,0.3) 0%, rgba(255,68,102,0.1) 100%);
    border-color: rgba(255,68,102,0.5);
}

.modal-btn.danger:hover {
    background: linear-gradient(135deg, rgba(255,68,102,0.5) 0%, rgba(255,68,102,0.3) 100%);
}

.save-slot {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    margin: 8px 0;
    background: rgba(255,255,255,0.05);
    border-radius: 6px;
    border: 1px solid rgba(255,255,255,0.1);
}

.save-slot-info {
    flex: 1;
}

.save-slot-name {
    font-weight: bold;
    margin-bottom: 4px;
}

.save-slot-date {
    font-size: 11px;
    color: #888;
}

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

.save-slot-btn {
    padding: 6px 12px;
    background: rgba(74,158,255,0.3);
    border: none;
    border-radius: 4px;
    color: #fff;
    cursor: pointer;
    font-size: 11px;
}

.save-slot-btn.delete {
    background: rgba(255,68,102,0.3);
}

.no-saves {
    text-align: center;
    color: #666;
    padding: 20px;
}

/* Mining indicator */
.mining-progress {
    position: absolute;
    pointer-events: none;
}

/* Minimap */
.minimap-container {
    position: absolute;
    bottom: 15px;
    left: 15px;
    background: rgba(0,0,0,0.85);
    border: 2px solid #4a9eff;
    border-radius: 8px;
    padding: 8px;
    z-index: 100;
    max-width: calc(100% - 250px);
    box-sizing: border-box;
}

.minimap-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 5px;
    font-size: 10px;
    color: #4a9eff;
}

#minimap {
    display: block;
    border-radius: 4px;
    cursor: pointer;
    width: 150px;
    height: 150px;
    max-width: 100%;
    max-height: 25vh;
}

@media (max-height: 700px) {
    #minimap {
        width: 120px;
        height: 120px;
    }
}

@media (max-height: 500px) {
    #minimap {
        width: 80px;
        height: 80px;
    }
    
    .minimap-header {
        font-size: 8px;
    }
}

@media (max-width: 800px) {
    .minimap-container {
        bottom: 10px;
        left: 10px;
        padding: 5px;
    }
    
    #minimap {
        width: 100px;
        height: 100px;
    }
}

/* Sound toggle */
.sound-toggle {
    position: absolute;
    bottom: 15px;
    right: 215px;
    background: rgba(0,0,0,0.85);
    border: 2px solid #4a9eff;
    border-radius: 8px;
    padding: 8px 12px;
    z-index: 100;
    cursor: pointer;
    font-size: 12px;
    color: #fff;
    transition: all 0.2s;
}

.sound-toggle:hover {
    background: rgba(74,158,255,0.2);
}

.sound-toggle.muted {
    border-color: #666;
    color: #666;
}

@media (max-width: 800px) {
    .sound-toggle {
        right: auto;
        left: 15px;
        bottom: 180px;
        padding: 6px 10px;
        font-size: 10px;
    }
}

@media (max-height: 500px) {
    .sound-toggle {
        bottom: auto;
        top: 70px;
        left: 15px;
    }
}

/* Wave indicator */
.wave-indicator {
    position: absolute;
    top: 60px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, rgba(30,30,50,0.95) 0%, rgba(20,20,40,0.95) 100%);
    border: 2px solid #ff4444;
    border-radius: 8px;
    padding: 10px 20px;
    text-align: center;
    z-index: 100;
    box-shadow: 0 4px 20px rgba(255,68,68,0.3);
}

.wave-indicator.peaceful {
    border-color: #44ff44;
    box-shadow: 0 4px 20px rgba(68,255,68,0.2);
}

.wave-indicator .wave-title {
    font-size: 14px;
    font-weight: bold;
    color: #ff6666;
    margin-bottom: 4px;
}

.wave-indicator.peaceful .wave-title {
    color: #66ff66;
}

.wave-indicator .wave-info {
    font-size: 12px;
    color: #aaa;
}