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

body {
    background: #0d0d1a;
    color: #eee;
    font-family: system-ui, -apple-system, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    padding: 12px;
    -webkit-tap-highlight-color: transparent;
}

.hidden {
    display: none !important;
}

#main-menu {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 80vh;
    width: 100%;
}

.menu-content {
    text-align: center;
    max-width: 520px;
    width: 100%;
}

.game-title {
    font-size: 2.4rem;
    margin-bottom: 6px;
    background: linear-gradient(135deg, #4a90d9, #e94560);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.menu-subtitle {
    color: #777;
    margin-bottom: 18px;
    font-size: 0.95rem;
}

#unlocks-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.unlock-label {
    color: #888;
    font-size: 0.85rem;
}

#unlocked-towers {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
}

.tower-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    background: #1a2a4e;
    border: 1px solid #3a5a8a;
}

.tower-badge.locked-badge {
    opacity: 0.4;
    border-color: #333;
}

#stage-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.stage-btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    background: #16213e;
    border: 2px solid #2a3a5a;
    border-radius: 10px;
    color: #eee;
    cursor: pointer;
    font-size: 0.95rem;
    transition: all 0.15s ease;
    text-align: left;
    width: 100%;
}

.stage-btn:hover:not(:disabled) {
    border-color: #4a90d9;
    background: #1a2a4e;
    transform: translateY(-1px);
}

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

.stage-btn .stage-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.stage-btn .stage-title {
    font-weight: 700;
    font-size: 1.05rem;
}

.stage-btn .stage-desc {
    font-size: 0.8rem;
    color: #888;
}

.stage-btn .stage-status {
    font-size: 0.85rem;
    font-weight: 600;
}

.stage-btn .status-unlocked {
    color: #2ecc71;
}

.stage-btn .status-locked {
    color: #e94560;
}

.stage-btn .status-cleared {
    color: #f1c40f;
}

.menu-hint {
    color: #555;
    font-size: 0.8rem;
    margin-bottom: 14px;
}




#game-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

#top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 800px;
    max-width: 100%;
    margin-bottom: 8px;
    gap: 10px;
}

#stage-name {
    font-size: 1.05rem;
    color: #4a90d9;
    flex: 1;
    text-align: center;
}

#ui {
    display: flex;
    gap: 14px;
    font-size: 0.95rem;
    white-space: nowrap;
}

#game-container {
    position: relative;
    border: 3px solid #4a4a6a;
    border-radius: 8px;
    overflow: hidden;
    max-width: 100%;
}

canvas {
    display: block;
    background: #16213e;
    cursor: crosshair;
    max-width: 100%;
    height: auto;
    touch-action: none;
}

#controls {
    margin-top: 10px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
}

button {
    padding: 10px 18px;
    background: #0f3460;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95rem;
    min-height: 42px;
}

button:hover {
    background: #1a4a8a;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    background: #2a2a4a;
}

.btn-secondary:hover {
    background: #3a3a5a;
}

#message {
    margin-top: 8px;
    height: 22px;
    color: #e94560;
    font-weight: bold;
    font-size: 0.9rem;
}

#tower-picker {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(15, 20, 40, 0.96);
    border: 2px solid #4a90d9;
    border-radius: 12px;
    padding: 12px 16px;
    z-index: 15;
    text-align: center;
    min-width: 280px;
}

.picker-title {
    font-size: 0.9rem;
    color: #4a90d9;
    margin-bottom: 10px;
    font-weight: 600;
}

#tower-options {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 10px;
}

.tower-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 10px 12px;
    background: #1a2a4e;
    border: 2px solid #2a4a7a;
    border-radius: 8px;
    cursor: pointer;
    min-width: 90px;
    color: #eee;
    font-size: 0.8rem;
}

.tower-option:hover {
    border-color: #4a90d9;
    background: #243a6e;
}

.tower-option .opt-name {
    font-weight: 700;
}

.tower-option .opt-cost {
    color: #f1c40f;
}

.tower-option .opt-desc {
    color: #888;
    font-size: 0.7rem;
}

#upgrade-panel {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 220px;
    background: rgba(15, 20, 40, 0.95);
    border: 2px solid #4a90d9;
    border-radius: 10px;
    padding: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    z-index: 10;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    font-weight: bold;
    font-size: 1rem;
    color: #4a90d9;
}

#btn-close-panel {
    background: transparent;
    border: none;
    color: #aaa;
    font-size: 1.1rem;
    padding: 0 4px;
    line-height: 1;
    cursor: pointer;
    min-height: auto;
}

#btn-close-panel:hover {
    color: #e94560;
    background: transparent;
}

.panel-stats {
    display: flex;
    flex-direction: column;
    gap: 5px;
    margin-bottom: 12px;
    font-size: 0.85rem;
    color: #ccc;
}

.panel-stats span {
    color: #fff;
    font-weight: 600;
}

.panel-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.panel-actions button {
    width: 100%;
    padding: 8px 12px;
    font-size: 0.9rem;
}

.panel-actions button.sell {
    background: #5a2a2a;
}

.panel-actions button.sell:hover {
    background: #8a3a3a;
}

.overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 20;
}

.overlay-box {
    background: #16213e;
    border: 2px solid #4a90d9;
    border-radius: 12px;
    padding: 28px 36px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    max-width: 90%;
}

.overlay-box h2 {
    margin-bottom: 8px;
    font-size: 1.5rem;
}

.overlay-box p {
    color: #aaa;
    margin-bottom: 8px;
}

.unlock-reward {
    color: #f1c40f !important;
    font-weight: 600;
    margin-bottom: 16px !important;
}

.overlay-buttons {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 12px;
}

@media (max-width:600px) {
    .game-title {
        font-size: 1.8rem;
    }

    #top-bar {
        flex-wrap: wrap;
    }

    #upgrade-panel {
        width: 180px;
        font-size: 0.85rem;
    }

    .tower-option {
        min-width: 75px;
        padding: 8px;
    }
}