/* ===== CSS RESET & BASE ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body,
html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #1a1a1a;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: 'Poppins', system-ui, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

#gameContainer {
    position: relative;
    width: min(100vw, 100vh * 9 / 16);
    height: min(100vh, 100vw * 16 / 9);
    background: #87CEEB;
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

/* ===== CSS CUSTOM PROPERTIES ===== */
:root {
    /* Colors */
    --color-primary: #D4845C;
    --color-primary-dark: #B86F4A;
    --color-accent: #F59E42;
    --color-accent-hover: #E8903A;
    --color-success: #4CAF50;
    --color-success-hover: #45A049;
    --color-danger: #E74C3C;
    --color-danger-hover: #D43F2F;
    --color-neutral-dark: #2C1810;
    --color-neutral-light: #FFF8F0;
    --color-overlay: rgba(44, 24, 16, 0.85);

    /* Spacing (8px grid) */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 32px;
    --space-xl: 48px;

    /* Animation Timings */
    --transition-fast: 150ms;
    --transition-normal: 300ms;
    --transition-slow: 500ms;

    /* Easing Functions */
    --ease-out: cubic-bezier(0.0, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.6, 0.32, 1.6);

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.4);
    --shadow-text: 2px 2px 4px rgba(0, 0, 0, 0.8);
    --shadow-text-strong: 3px 3px 6px rgba(0, 0, 0, 0.9);
}

/* ===== CANVAS ===== */
#gameCanvas {
    display: block;
    width: 100%;
    height: 100%;
    touch-action: none;
    -ms-touch-action: none;
}

/* ===== UI OVERLAY SYSTEM ===== */
.ui-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.ui-overlay>* {
    pointer-events: auto;
}

.ui-button {
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
    transition: transform var(--transition-fast) var(--ease-out),
        filter var(--transition-fast) var(--ease-out);
}

.ui-button:active {
    transform: scale(0.95);
    filter: brightness(0.9);
}

/* ===== TOP UI BAR ===== */
#topUIBar {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: var(--space-sm);
    background: linear-gradient(180deg, var(--color-overlay) 0%, rgba(44, 24, 16, 0.7) 100%);
    box-shadow: var(--shadow-md);
    pointer-events: none;
}

#topUIBar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        repeating-linear-gradient(45deg, transparent, transparent 10px, rgba(212, 132, 92, 0.1) 10px, rgba(212, 132, 92, 0.1) 20px);
    pointer-events: none;
}

#timerDisplay {
    font-family: 'Fredoka', sans-serif;
    font-size: 64px;
    font-weight: 700;
    color: var(--color-neutral-light);
    text-align: center;
    text-shadow: var(--shadow-text-strong);
    margin-bottom: var(--space-xs);
    letter-spacing: 2px;
}

#detectionMeterContainer {
    max-width: 500px;
    margin: 0 auto;
}

#detectionLabel {
    font-size: 24px;
    font-weight: 600;
    color: var(--color-neutral-light);
    text-align: center;
    text-shadow: var(--shadow-text);
    margin-bottom: var(--space-xs);
}

#detectionMeterOuter {
    width: 100%;
    height: 40px;
    background: rgba(0, 0, 0, 0.6);
    border: 4px solid var(--color-neutral-light);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    position: relative;
}

#detectionMeterInner {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--color-success) 0%, #FFC107 50%, var(--color-danger) 100%);
    transition: width var(--transition-fast) var(--ease-out);
    box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.3);
}

#detectionMeterInner.high-alert {
    animation: pulse-danger 1s ease-in-out infinite;
}

/* ===== STATE INDICATOR ===== */
#stateIndicator {
    position: absolute;
    bottom: var(--space-md);
    left: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-overlay);
    border: 3px solid var(--color-accent);
    border-radius: 16px;
    display: none;
    align-items: center;
    gap: var(--space-sm);
    box-shadow: var(--shadow-md);
    transition: opacity var(--transition-normal) var(--ease-out);
}

#stateIndicator.visible {
    display: flex;
}

#stateIcon {
    font-size: 32px;
    line-height: 1;
}

#stateText {
    font-size: 24px;
    font-weight: 600;
    color: var(--color-neutral-light);
    text-shadow: var(--shadow-text);
}

/* ===== HIDE BUTTON ===== */
#hideButton {
    position: absolute;
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: 128px;
    height: 128px;
    background: linear-gradient(135deg, var(--color-success) 0%, var(--color-success-hover) 100%);
    border: 5px solid var(--color-neutral-light);
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    font-family: 'Fredoka', sans-serif;
    font-size: 28px;
    font-weight: 700;
    color: var(--color-neutral-light);
    text-shadow: var(--shadow-text);
    box-shadow: var(--shadow-lg);
    animation: bounce-in var(--transition-slow) var(--ease-bounce);
}

#hideButton .hide-icon {
    font-size: 40px;
    margin-bottom: 4px;
}

/* ===== PAUSE BUTTON ===== */
#pauseButton {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    width: 96px;
    height: 96px;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
    border: 4px solid var(--color-neutral-light);
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    color: var(--color-neutral-light);
    box-shadow: var(--shadow-md);
}

/* ===== HIDE PROMPT ===== */
#hidePrompt {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: var(--space-md) var(--space-xl);
    background: linear-gradient(135deg, var(--color-success) 0%, var(--color-success-hover) 100%);
    border: 4px solid var(--color-neutral-light);
    border-radius: 20px;
    font-family: 'Fredoka', sans-serif;
    font-size: 32px;
    font-weight: 700;
    color: var(--color-neutral-light);
    text-shadow: var(--shadow-text);
    box-shadow: var(--shadow-lg);
    display: none;
    white-space: nowrap;
    animation: bounce-in var(--transition-slow) var(--ease-bounce);
}

#hidePrompt.visible {
    display: block;
}

/* ===== GAME OVER SCREEN ===== */
#gameOverScreen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.92);
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: var(--space-xl);
    animation: fade-in var(--transition-slow) var(--ease-out);
}

#gameOverScreen.visible {
    display: flex;
}

#gameOverContent {
    text-align: center;
    animation: slide-up var(--transition-slow) var(--ease-out);
}

#gameOverText {
    font-family: 'Fredoka', sans-serif;
    font-size: 80px;
    font-weight: 700;
    color: var(--color-neutral-light);
    margin-bottom: var(--space-md);
    text-shadow: var(--shadow-text-strong);
    letter-spacing: 2px;
}

#gameOverText.won {
    color: var(--color-success);
}

#gameOverText.lost {
    color: var(--color-danger);
}

#gameOverSubtext {
    font-size: 28px;
    font-weight: 600;
    color: var(--color-neutral-light);
    margin-bottom: var(--space-lg);
    text-shadow: var(--shadow-text);
}

#restartButton {
    padding: var(--space-md) var(--space-xl);
    font-family: 'Fredoka', sans-serif;
    font-size: 36px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
    color: var(--color-neutral-light);
    border: 5px solid var(--color-neutral-light);
    border-radius: 20px;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    text-shadow: var(--shadow-text);
    transition: transform var(--transition-fast) var(--ease-out),
        filter var(--transition-fast) var(--ease-out);
}

#restartButton:hover {
    filter: brightness(1.1);
}

#restartButton:active {
    transform: scale(0.95);
    filter: brightness(0.9);
}

/* ===== ANIMATIONS ===== */
@keyframes fade-in {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slide-up {
    from {
        transform: translateY(50px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes bounce-in {
    0% {
        transform: scale(0);
        opacity: 0;
    }

    50% {
        transform: scale(1.1);
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes pulse-danger {

    0%,
    100% {
        box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.3);
    }

    50% {
        box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.3),
            0 0 20px rgba(231, 76, 60, 0.8);
    }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}