/* Light Collector - Healing Shooter */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    background: #0b0f1a;
    font-family: ui-rounded, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    color: #f2f6ff;
    overscroll-behavior: none;
    overflow: hidden;
    touch-action: none;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}

#game {
    display: block;
    width: 100vw;
    height: 100vh;
    touch-action: none;
}

/* HUD */
.hud {
    position: fixed;
    top: 12px;
    left: 12px;
    right: 12px;
    display: flex;
    justify-content: space-between;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 10;
}

.hud.visible {
    opacity: 1;
}

.hud .score,
.hud .timer,
.hud .combo {
    font-weight: 700;
    font-size: 14px;
    letter-spacing: 0.5px;
    background: rgba(15, 23, 42, 0.5);
    padding: 8px 12px;
    border-radius: 8px;
    backdrop-filter: blur(6px);
    text-shadow: 0 0 8px rgba(170, 220, 255, 0.3);
}

.hud .combo {
    transition: transform 0.12s ease, color 0.15s ease;
}

.combo-pop {
    transform: scale(1.15);
    color: #aee3ff !important;
}

/* Main Screen UI */
.main-ui {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.5s ease;
    z-index: 20;
}

.main-ui.visible {
    opacity: 1;
    pointer-events: auto;
}

.main-ui .title {
    font-size: 32px;
    font-weight: 700;
    color: #fff;
    text-shadow: 0 0 20px rgba(140, 200, 255, 0.5);
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.main-ui .subtitle {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 32px;
    animation: pulse 2s ease-in-out infinite;
}

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

.mode-toggle {
    pointer-events: auto;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
}

.toggle-label input[type="checkbox"] {
    display: none;
}

.mode-label {
    font-size: 14px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.5);
    transition: color 0.2s ease;
}

.mode-label:first-of-type {
    color: rgba(255, 255, 255, 0.9);
}

.toggle-label input[type="checkbox"]:checked ~ .mode-label:first-of-type {
    color: rgba(255, 255, 255, 0.5);
}

.toggle-label input[type="checkbox"]:checked ~ .mode-label:last-of-type {
    color: rgba(255, 255, 255, 0.9);
}

.toggle-visual {
    width: 48px;
    height: 26px;
    background: rgba(15, 23, 42, 0.6);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 13px;
    position: relative;
    transition: all 0.2s ease;
    backdrop-filter: blur(6px);
}

.toggle-visual::before {
    content: "";
    position: absolute;
    width: 18px;
    height: 18px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    top: 2px;
    left: 2px;
    transition: all 0.2s ease;
}

.toggle-label input[type="checkbox"]:checked + .toggle-visual {
    background: rgba(112, 170, 255, 0.5);
    border-color: rgba(190, 230, 255, 0.6);
}

.toggle-label input[type="checkbox"]:checked + .toggle-visual::before {
    transform: translateX(22px);
    background: rgba(255, 255, 255, 0.9);
}

/* Game Over Overlay */
.overlay {
    position: fixed;
    inset: 0;
    display: none;
    place-items: center;
    background: radial-gradient(600px 600px at 50% 50%, rgba(80, 120, 200, 0.15), rgba(0, 0, 0, 0.7));
    pointer-events: none;
    z-index: 30;
}

.overlay.show {
    display: grid;
    pointer-events: auto;
}

.overlay .panel {
    text-align: center;
    background: rgba(17, 24, 39, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 28px 40px;
    backdrop-filter: blur(12px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.result {
    font-weight: 700;
    font-size: 20px;
    color: #f7faff;
    text-shadow: 0 0 12px rgba(140, 190, 255, 0.5);
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

.restart-hint {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
    animation: pulse 2s ease-in-out infinite;
}

/* Canvas rendering */
canvas {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

/* Mobile adjustments */
@media (max-width: 480px) {
    .main-ui .title {
        font-size: 26px;
    }

    .main-ui .subtitle {
        font-size: 14px;
    }

    .hud .score,
    .hud .timer,
    .hud .combo {
        font-size: 12px;
        padding: 6px 10px;
    }
}