/* ============================================
   SPACESHIP 3D GAME - BASE STYLES
   ============================================ */

:root {
    --color-primary: #00f0ff;
    --color-secondary: #ff00f5;
    --color-accent: #00ff88;
    --color-dark: #0a0a1a;
    --color-darker: #050510;
    --font-main: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --glow-primary: 0 0 20px rgba(0, 240, 255, 0.5);
    --glow-secondary: 0 0 20px rgba(255, 0, 245, 0.5);
    --glow-accent: 0 0 20px rgba(0, 255, 136, 0.5);
}

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

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: var(--font-main);
    background: var(--color-darker);
}

/* ============================================
   GAME CONTAINER
   ============================================ */

#game-container {
    position: relative;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(135deg, var(--color-darker) 0%, var(--color-dark) 100%);
}

#game-canvas {
    display: block;
    width: 100%;
    height: 100%;
    position: relative;
    z-index: 1;
}

/* ============================================
   LOADING SCREEN
   ============================================ */

#loading-screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at center, var(--color-dark) 0%, var(--color-darker) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    transition: opacity 0.5s ease-out;
}

#loading-screen.hidden {
    opacity: 0;
    pointer-events: none;
}

.loader {
    text-align: center;
}

.spinner {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    border: 3px solid transparent;
    border-top-color: var(--color-primary);
    border-right-color: var(--color-secondary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    box-shadow: var(--glow-primary), inset var(--glow-secondary);
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loader p {
    color: var(--color-primary);
    font-size: 1.2rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    text-shadow: var(--glow-primary);
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 0.5;
    }

    50% {
        opacity: 1;
    }
}

/* ============================================
   UI OVERLAY
   ============================================ */

#ui-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 50;
}

#score-display {
    position: absolute;
    top: 30px;
    right: 30px;
    background: rgba(10, 10, 26, 0.8);
    border: 1px solid var(--color-primary);
    border-radius: 8px;
    padding: 15px 25px;
    text-align: center;
    box-shadow: var(--glow-primary), inset 0 0 20px rgba(0, 240, 255, 0.1);
    backdrop-filter: blur(10px);
}

#score-display .label {
    display: block;
    font-size: 0.7rem;
    color: var(--color-primary);
    letter-spacing: 3px;
    margin-bottom: 5px;
    opacity: 0.8;
}

#score-value {
    font-size: 2rem;
    font-weight: 700;
    color: #fff;
    text-shadow: var(--glow-primary);
}

/* ============================================
   ENERGY BAR
   ============================================ */

#energy-display {
    position: absolute;
    top: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(10, 10, 26, 0.8);
    border: 1px solid var(--color-primary);
    border-radius: 8px;
    padding: 12px 20px;
    text-align: center;
    box-shadow: var(--glow-primary), inset 0 0 20px rgba(0, 240, 255, 0.1);
    backdrop-filter: blur(10px);
}

#energy-display .label {
    display: block;
    font-size: 0.65rem;
    color: var(--color-primary);
    letter-spacing: 3px;
    margin-bottom: 8px;
    opacity: 0.8;
}

#energy-bar {
    width: 200px;
    height: 12px;
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid var(--color-primary);
    border-radius: 6px;
    overflow: hidden;
    position: relative;
}

#energy-fill {
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    border-radius: 4px;
    transition: width 0.1s ease-out, background 0.3s ease;
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
}

/* ============================================
   GAME OVER SCREEN
   ============================================ */

#game-over-screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(5, 5, 16, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 250;
    /* Higher than pause-screen (200) */
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s ease;
}

#game-over-screen.visible {
    opacity: 1;
    pointer-events: auto;
}

.game-over-content {
    text-align: center;
    animation: gameOverAppear 0.5s ease forwards;
}

@keyframes gameOverAppear {
    from {
        transform: scale(0.8);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.game-over-content h1 {
    font-size: 4rem;
    font-weight: 900;
    color: #ff4444;
    text-transform: uppercase;
    letter-spacing: 10px;
    text-shadow:
        0 0 20px rgba(255, 68, 68, 0.8),
        0 0 40px rgba(255, 68, 68, 0.5),
        0 0 60px rgba(255, 68, 68, 0.3);
    margin-bottom: 20px;
    animation: glitch 2s infinite;
}

@keyframes glitch {

    0%,
    90%,
    100% {
        transform: translate(0);
    }

    92% {
        transform: translate(-2px, 1px);
    }

    94% {
        transform: translate(2px, -1px);
    }

    96% {
        transform: translate(-1px, -1px);
    }

    98% {
        transform: translate(1px, 1px);
    }
}

.final-score {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 40px;
    letter-spacing: 2px;
}

#retry-button {
    padding: 18px 50px;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--color-dark);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow:
        0 0 20px rgba(0, 240, 255, 0.5),
        0 0 40px rgba(0, 255, 136, 0.3);
}

#retry-button:hover {
    transform: scale(1.05);
    box-shadow:
        0 0 30px rgba(0, 240, 255, 0.8),
        0 0 60px rgba(0, 255, 136, 0.5);
}

#retry-button:active {
    transform: scale(0.98);
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
    #score-display {
        top: 15px;
        right: 15px;
        padding: 10px 15px;
    }

    #score-value {
        font-size: 1.5rem;
    }

    #controls-display {
        display: none;
    }

    #energy-display {
        top: 15px;
        padding: 8px 15px;
    }

    #energy-bar {
        width: 120px;
        height: 10px;
    }

    .game-over-content h1 {
        font-size: 2.5rem;
        letter-spacing: 5px;
    }

    .final-score {
        font-size: 1rem;
    }

    #retry-button {
        padding: 14px 35px;
        font-size: 1rem;
    }
}

/* ============================================
   CONTROLS DISPLAY
   ============================================ */

#controls-display {
    position: absolute;
    bottom: 30px;
    left: 30px;
    background: rgba(10, 10, 26, 0.8);
    border: 1px solid var(--color-primary);
    border-radius: 8px;
    padding: 15px 20px;
    box-shadow: var(--glow-primary), inset 0 0 20px rgba(0, 240, 255, 0.1);
    backdrop-filter: blur(10px);
}

.control-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.control-row:last-child {
    margin-bottom: 0;
}

.key {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 28px;
    padding: 0 8px;
    background: linear-gradient(135deg, var(--color-dark) 0%, #0a0a2a 100%);
    border: 1px solid var(--color-primary);
    border-radius: 4px;
    color: var(--color-primary);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-shadow: var(--glow-primary);
}

.control-label {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.75rem;
    letter-spacing: 1px;
}

/* ============================================
   PAUSE SCREEN
   ============================================ */

#pause-screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(5, 5, 16, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    backdrop-filter: blur(5px);
}

#pause-screen.visible {
    opacity: 1;
    pointer-events: auto;
}

.pause-content {
    text-align: center;
    animation: pauseAppear 0.3s ease forwards;
}

@keyframes pauseAppear {
    from {
        transform: scale(0.9);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.pause-content h1 {
    font-size: 4rem;
    font-weight: 900;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 15px;
    text-shadow: var(--glow-primary);
    margin-bottom: 20px;
}

.pause-content p {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 40px;
    letter-spacing: 2px;
}

#resume-button {
    padding: 18px 50px;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--color-dark);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow:
        0 0 20px rgba(0, 240, 255, 0.5),
        0 0 40px rgba(0, 255, 136, 0.3);
}

#resume-button:hover {
    transform: scale(1.05);
    box-shadow:
        0 0 30px rgba(0, 240, 255, 0.8),
        0 0 60px rgba(0, 255, 136, 0.5);
}

#resume-button:active {
    transform: scale(0.98);
}