/* ===== CSS RESET ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body,
html {
    width: 100%;
    height: 100%;
    overflow: hidden;
    touch-action: none;
    -ms-touch-action: none;
    font-family: 'Orbitron', sans-serif;
    background: #000;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* ===== CUSTOM PROPERTIES (responsive) ===== */
:root {
    --transition-fast: 150ms;
    --transition-normal: 300ms;
    --transition-slow: 500ms;
    --ease-out: cubic-bezier(0.0, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.6, 0.32, 1.6);

    /* Responsive spacing using vw */
    --space-xs: clamp(4px, 1.5vw, 8px);
    --space-sm: clamp(8px, 2.5vw, 16px);
    --space-md: clamp(12px, 3.5vw, 24px);
    --space-lg: clamp(16px, 4.5vw, 32px);
    --space-xl: clamp(24px, 6vw, 48px);

    /* Colors */
    --color-bg: #0a0a1a;
    --color-primary: #00ffff;
    --color-secondary: #ff00ff;
    --color-text: #ffffff;
    --color-text-dim: #888888;
    --color-danger: #ff3366;
    --color-success: #00ff88;
}

/* ===== GAME CONTAINER ===== */
/* Fullscreen on mobile portrait, 9:16 letterboxed on desktop/landscape */
#game-container {
    position: relative;
    width: 100%;
    height: 100%;
    background: #000;
    overflow: hidden;
}

@media (min-aspect-ratio: 9/16) {
    #game-container {
        max-width: calc(100vh * 9 / 16);
        max-height: 100%;
        aspect-ratio: 9 / 16;
        margin: auto;
    }
}

/* ===== CANVAS LAYERS ===== */
canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    image-rendering: crisp-edges;
}

#background-canvas {
    z-index: 1;
}

#game-canvas {
    z-index: 2;
}

/* ===== UI OVERLAY ===== */
.ui-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10;
}

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

/* ===== HUD ===== */
.hud {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    padding: var(--space-sm);
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.8), transparent);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-sm);
    pointer-events: none;
}

.hud-left,
.hud-right {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.hud-stat {
    display: flex;
    align-items: center;
    gap: clamp(2px, 0.8vw, 4px);
    font-size: clamp(10px, 3vw, 14px);
    color: var(--color-text);
    text-shadow: 0 0 10px rgba(0, 255, 255, 0.5);
    background: rgba(0, 0, 0, 0.6);
    padding: clamp(2px, 0.8vw, 4px) clamp(4px, 1.5vw, 8px);
    border-radius: 6px;
}

.hud-label {
    font-size: clamp(8px, 2.5vw, 12px);
    color: var(--color-text-dim);
}

/* Fuel Bar */
.fuel-bar-container {
    width: clamp(80px, 25vw, 140px);
    height: clamp(10px, 3vw, 18px);
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid var(--color-primary);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 0 8px rgba(0, 255, 255, 0.3);
}

.fuel-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-success));
    transition: width 0.3s ease;
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.8);
}

/* Health Hearts */
.health-hearts {
    display: flex;
    gap: var(--space-xs);
}

.heart {
    width: clamp(14px, 4.5vw, 22px);
    height: clamp(14px, 4.5vw, 22px);
    background: var(--color-danger);
    clip-path: polygon(50% 20%, 100% 0%, 100% 50%, 50% 100%, 0% 50%, 0% 0%);
    filter: drop-shadow(0 0 6px rgba(255, 51, 102, 0.6));
    transition: opacity var(--transition-fast);
}

.heart.empty {
    opacity: 0.2;
}

/* ===== MENUS ===== */
.menu-screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.95), rgba(10, 10, 26, 0.95)),
        radial-gradient(circle at 50% 0%, rgba(0, 255, 255, 0.1), transparent 50%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: clamp(8px, 2vw, 16px);
    padding: var(--space-sm);
}

.menu-title {
    font-size: clamp(20px, 7vw, 36px);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-xs);
    text-align: center;
    width: 100%;
    font-weight: 900;
    letter-spacing: 2px;
    animation: titleGlow 3s ease-in-out infinite;
}

@keyframes titleGlow {

    0%,
    100% {
        filter: drop-shadow(0 0 10px rgba(0, 255, 255, 0.6)) drop-shadow(0 0 20px rgba(255, 0, 255, 0.3));
    }

    50% {
        filter: drop-shadow(0 0 20px rgba(0, 255, 255, 0.9)) drop-shadow(0 0 30px rgba(255, 0, 255, 0.6));
    }
}

.menu-subtitle {
    font-size: clamp(11px, 3.2vw, 16px);
    color: var(--color-text-dim);
    text-align: center;
    margin-bottom: var(--space-sm);
    line-height: 1.4;
}

.menu-buttons {
    display: flex;
    flex-direction: column;
    gap: clamp(6px, 1.8vw, 10px);
    width: 85%;
    max-width: 360px;
}

.btn {
    padding: clamp(6px, 2vw, 10px) clamp(10px, 3vw, 16px);
    font-size: clamp(12px, 3.8vw, 18px);
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text);
    background: linear-gradient(135deg, rgba(0, 255, 255, 0.2), rgba(255, 0, 255, 0.2));
    border: 2px solid var(--color-primary);
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-normal) var(--ease-out);
    text-align: center;
    min-height: clamp(40px, 11vw, 56px);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.3), inset 0 0 20px rgba(0, 255, 255, 0.1);
    font-weight: 700;
    letter-spacing: 1px;
}

.btn:hover,
.btn:active {
    background: linear-gradient(135deg, rgba(0, 255, 255, 0.4), rgba(255, 0, 255, 0.4));
    box-shadow: 0 0 40px rgba(0, 255, 255, 0.8), 0 0 20px rgba(255, 0, 255, 0.5), inset 0 0 20px rgba(0, 255, 255, 0.2);
    transform: scale(1.03);
}

.btn-secondary {
    border-color: var(--color-text-dim);
    box-shadow: 0 0 10px rgba(136, 136, 136, 0.3);
    background: linear-gradient(135deg, rgba(136, 136, 136, 0.15), rgba(136, 136, 136, 0.1));
    font-size: clamp(11px, 3.5vw, 16px);
}

.btn-secondary:hover,
.btn-secondary:active {
    box-shadow: 0 0 20px rgba(136, 136, 136, 0.5);
    background: linear-gradient(135deg, rgba(136, 136, 136, 0.25), rgba(136, 136, 136, 0.2));
}

/* ===== SHOP ===== */
.shop-screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    display: flex;
    flex-direction: column;
    padding: 0;
}

.shop-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md);
    border-bottom: 2px solid var(--color-primary);
    background: rgba(0, 0, 0, 0.8);
}

.shop-header-left {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.shop-title {
    font-size: clamp(18px, 5.5vw, 30px);
    color: var(--color-primary);
    text-shadow: 0 0 20px rgba(0, 255, 255, 0.8);
    margin: 0;
}

.shop-credits {
    font-size: clamp(12px, 3.5vw, 18px);
    color: var(--color-success);
    text-shadow: 0 0 10px rgba(0, 255, 136, 0.6);
}

.shop-back-btn {
    padding: var(--space-xs) var(--space-sm);
    font-size: clamp(12px, 3.5vw, 18px);
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text);
    background: linear-gradient(135deg, rgba(136, 136, 136, 0.2), rgba(136, 136, 136, 0.1));
    border: 2px solid var(--color-text-dim);
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-normal) var(--ease-out);
    min-width: clamp(80px, 22vw, 120px);
    text-align: center;
}

.shop-back-btn:hover,
.shop-back-btn:active {
    background: linear-gradient(135deg, rgba(136, 136, 136, 0.3), rgba(136, 136, 136, 0.2));
    box-shadow: 0 0 15px rgba(136, 136, 136, 0.5);
}

/* Tab Navigation */
.shop-tabs {
    display: flex;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    background: rgba(0, 0, 0, 0.6);
    border-bottom: 1px solid rgba(0, 255, 255, 0.3);
    overflow-x: auto;
}

.shop-tab {
    padding: var(--space-xs) var(--space-sm);
    font-size: clamp(10px, 3vw, 14px);
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text-dim);
    background: transparent;
    border: 2px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-normal) var(--ease-out);
    white-space: nowrap;
    flex-shrink: 0;
}

.shop-tab:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.shop-tab.active {
    color: var(--color-primary);
    border-color: var(--color-primary);
    box-shadow: 0 0 15px rgba(0, 255, 255, 0.5);
}

/* Tab Content */
.shop-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-sm);
}

.shop-tab-panel {
    display: none;
}

.shop-tab-panel.active {
    display: block;
}

.shop-upgrades {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.upgrade-card {
    background: rgba(0, 255, 255, 0.1);
    border: 2px solid var(--color-primary);
    border-radius: 8px;
    padding: var(--space-sm);
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.2);
}

.upgrade-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xs);
}

.upgrade-name {
    font-size: clamp(14px, 4.2vw, 22px);
    color: var(--color-text);
    font-weight: 700;
}

.upgrade-level {
    font-size: clamp(12px, 3.5vw, 18px);
    color: var(--color-primary);
}

.upgrade-description {
    font-size: clamp(10px, 3vw, 15px);
    color: var(--color-text-dim);
    margin-bottom: var(--space-xs);
    line-height: 1.3;
}

.upgrade-progress {
    display: flex;
    gap: var(--space-xs);
    margin-bottom: var(--space-sm);
}

.upgrade-pip {
    flex: 1;
    height: clamp(8px, 2.5vw, 14px);
    background: rgba(255, 255, 255, 0.2);
    border-radius: 6px;
}

.upgrade-pip.filled {
    background: var(--color-primary);
    box-shadow: 0 0 10px rgba(0, 255, 255, 0.6);
}

/* Star Display */
.star-display {
    display: flex;
    gap: var(--space-xs);
    justify-content: center;
    font-size: clamp(28px, 9vw, 48px);
    margin: var(--space-md) 0;
}

.star {
    transition: all 0.3s ease;
    text-shadow: 0 0 10px rgba(0, 255, 255, 0.6);
    animation: starPulse 0.6s ease-out;
}

.star.filled {
    color: var(--color-primary);
    text-shadow: 0 0 20px rgba(0, 255, 255, 0.9);
}

.star.empty {
    color: var(--color-text-dim);
    text-shadow: none;
}

@keyframes starPulse {
    0% {
        transform: scale(0.5);
        opacity: 0;
    }

    50% {
        transform: scale(1.2);
    }

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

.upgrade-button {
    width: 100%;
    padding: var(--space-xs);
    font-size: clamp(11px, 3.2vw, 16px);
    font-family: 'Orbitron', sans-serif;
    color: var(--color-text);
    background: linear-gradient(135deg, rgba(0, 255, 255, 0.3), rgba(0, 255, 136, 0.3));
    border: 2px solid var(--color-success);
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-normal) var(--ease-out);
    min-height: clamp(36px, 10vw, 48px);
}

.upgrade-button:hover,
.upgrade-button:active {
    background: linear-gradient(135deg, rgba(0, 255, 255, 0.5), rgba(0, 255, 136, 0.5));
    box-shadow: 0 0 20px rgba(0, 255, 136, 0.6);
}

.upgrade-button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    background: rgba(136, 136, 136, 0.2);
    border-color: var(--color-text-dim);
}

.shop-footer {
    display: flex;
    justify-content: center;
}

/* ===== GAME OVER ===== */
.game-over-screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
}

.game-over-title {
    font-size: clamp(24px, 8vw, 44px);
    color: var(--color-danger);
    text-shadow: 0 0 30px rgba(255, 51, 102, 0.9);
    font-weight: 900;
    text-align: center;
    width: 100%;
}

.game-over-stats {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
}

.game-over-stat {
    font-size: clamp(14px, 4.5vw, 22px);
    color: var(--color-text);
}

.game-over-stat-label {
    color: var(--color-text-dim);
    font-size: clamp(11px, 3.2vw, 16px);
}

.game-over-stat-value {
    color: var(--color-primary);
    font-size: clamp(18px, 6vw, 32px);
    text-shadow: 0 0 15px rgba(0, 255, 255, 0.8);
    font-weight: 700;
}

/* ===== VIRTUAL JOYSTICKS ===== */
.joystick {
    position: absolute;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.joystick.active {
    opacity: 0.6;
}

.joystick-base {
    position: absolute;
    width: clamp(100px, 30vw, 160px);
    height: clamp(100px, 30vw, 160px);
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 255, 255, 0.3), rgba(0, 255, 255, 0.1));
    border: 3px solid rgba(0, 255, 255, 0.5);
    transform: translate(-50%, -50%);
}

.joystick-knob {
    position: absolute;
    width: clamp(50px, 15vw, 80px);
    height: clamp(50px, 15vw, 80px);
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 255, 255, 0.8), rgba(0, 255, 255, 0.4));
    border: 3px solid rgba(0, 255, 255, 0.9);
    transform: translate(-50%, -50%);
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.8);
}

/* ===== UTILITY CLASSES ===== */
.hidden {
    display: none !important;
}

/* ===== LOGO ANIMATION ===== */
#game-logo {
    animation: logoPulse 2s ease-in-out infinite;
}

@keyframes logoPulse {

    0%,
    100% {
        transform: scale(1);
        filter: drop-shadow(0 0 20px rgba(0, 255, 255, 0.6));
    }

    50% {
        transform: scale(1.1);
        filter: drop-shadow(0 0 30px rgba(0, 255, 255, 0.9)) drop-shadow(0 0 15px rgba(255, 0, 255, 0.5));
    }
}

#logo-container {
    position: relative;
    background: radial-gradient(circle, rgba(0, 255, 255, 0.1), transparent);
    border-radius: 50%;
    border: 2px solid rgba(0, 255, 255, 0.3);
    box-shadow: 0 0 30px rgba(0, 255, 255, 0.2) inset;
}

/* ===== FONTS ===== */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&display=swap');