/* ===================================
   BEAT PUSHER: NEON OVERFLOW v2.0
   Neon Color Scheme & Responsive Styling
=================================== */

:root {
    --bg-dark: #0a0a0f;
    --bg-darker: #050508;
    --neon-blue: #00f3ff;
    --neon-pink: #ff00ff;
    --neon-gold: #ffd700;
    --neon-green: #00ff88;
    --neon-orange: #ff6600;
    --glow-blue: 0 0 20px #00f3ff, 0 0 40px #00f3ff, 0 0 60px #00f3ff;
    --glow-pink: 0 0 20px #ff00ff, 0 0 40px #ff00ff, 0 0 60px #ff00ff;
    --glow-gold: 0 0 20px #ffd700, 0 0 40px #ffd700;
}

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

body {
    background: var(--bg-dark);
    font-family: 'Orbitron', sans-serif;
    overflow: hidden;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

#game-container {
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    /* Dynamic viewport height for mobile */
    position: relative;
    background: radial-gradient(ellipse at center, #1a1a2e 0%, var(--bg-dark) 50%, var(--bg-darker) 100%);
}

/* ===================================
   Title Screen
=================================== */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 100;
    background: radial-gradient(ellipse at center, #1a1a2e 0%, var(--bg-dark) 50%, var(--bg-darker) 100%);
    padding: 20px;
}

.game-title {
    font-size: clamp(2.5rem, 10vw, 6rem);
    font-weight: 900;
    color: var(--neon-blue);
    text-shadow: var(--glow-blue);
    letter-spacing: 0.15em;
    animation: pulse-glow 2s ease-in-out infinite;
    text-align: center;
}

.game-subtitle {
    font-size: clamp(0.9rem, 4vw, 2rem);
    font-weight: 400;
    color: var(--neon-pink);
    text-shadow: var(--glow-pink);
    letter-spacing: 0.4em;
    margin-top: 0.5rem;
    animation: pulse-glow 2s ease-in-out infinite 0.5s;
    text-align: center;
}

@keyframes pulse-glow {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

.neon-btn {
    margin-top: 2rem;
    padding: 0.8rem 2.5rem;
    font-family: 'Orbitron', sans-serif;
    font-size: clamp(1rem, 4vw, 1.5rem);
    font-weight: 700;
    color: var(--neon-gold);
    background: transparent;
    border: 3px solid var(--neon-gold);
    cursor: pointer;
    text-shadow: var(--glow-gold);
    box-shadow: var(--glow-gold), inset 0 0 20px rgba(255, 215, 0, 0.1);
    transition: all 0.3s ease;
    letter-spacing: 0.2em;
}

.neon-btn:hover,
.neon-btn:active {
    background: rgba(255, 215, 0, 0.2);
    transform: scale(1.05);
    box-shadow: 0 0 30px #ffd700, 0 0 60px #ffd700, 0 0 90px #ffd700;
}

.controls-hint {
    margin-top: 2rem;
    text-align: center;
}

.controls-hint p {
    color: rgba(255, 255, 255, 0.6);
    font-size: clamp(0.7rem, 2.5vw, 0.9rem);
    letter-spacing: 0.1em;
    margin: 0.5rem 0;
}

/* ===================================
   Game Canvas
=================================== */
#game-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

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

/* Top Bar - Horizontal Layout */
#top-bar {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 10px 15px;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.8) 0%, transparent 100%);
    pointer-events: none;
}

#gold-display {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    margin-left: 0;
}

#gold-display .label {
    font-size: clamp(0.6rem, 2vw, 0.8rem);
    color: var(--neon-gold);
    text-shadow: 0 0 10px var(--neon-gold);
    letter-spacing: 0.2em;
}

#gold-display .value {
    font-size: clamp(1.2rem, 5vw, 2rem);
    font-weight: 900;
    color: var(--neon-gold);
    text-shadow: 0 0 10px var(--neon-gold);
}

#stage-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: rgba(0, 0, 0, 0.5);
    padding: 5px 15px;
    border-radius: 10px;
    border: 1px solid var(--neon-pink);
    position: absolute;
    top: 60px;
    /* Moved down to avoid overlap */
    left: 50%;
    transform: translateX(-50%);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

#stage-display.level-up {
    transform: translateX(-50%) scale(1.5);
    border-color: var(--neon-gold);
    background: rgba(255, 215, 0, 0.2);
    box-shadow: 0 0 30px var(--neon-gold);
}

#stage-display .stage-label {
    font-size: 0.6rem;
    color: var(--neon-pink);
    letter-spacing: 0.2em;
}

#stage-display .stage-num {
    font-size: clamp(1rem, 4vw, 1.5rem);
    font-weight: 900;
    color: #fff;
}

#stage-display .bpm {
    font-size: 0.6rem;
    color: var(--neon-gold);
}



#combo-display {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

#combo {
    font-size: clamp(1.5rem, 5vw, 2.5rem);
    font-weight: 900;
    color: var(--neon-gold);
    text-shadow: var(--glow-gold);
    line-height: 1;
}

.combo-label {
    font-size: clamp(0.5rem, 1.5vw, 0.7rem);
    color: rgba(255, 215, 0, 0.7);
    letter-spacing: 0.2em;
}

.combo-multiplier {
    font-size: clamp(0.6rem, 1.8vw, 0.85rem);
    color: var(--neon-green);
    text-shadow: 0 0 8px var(--neon-green);
    font-weight: 700;
    margin-top: 2px;
    transition: color 0.3s, text-shadow 0.3s;
}

/* Multiplier color changes based on value */
.combo-multiplier.high {
    color: var(--neon-gold);
    text-shadow: var(--glow-gold);
}

.combo-multiplier.max {
    color: #ff00ff;
    text-shadow: var(--glow-pink);
    animation: pulse-glow 0.5s ease-in-out infinite;
}

/* Energy Bar - Below top bar, centered, moved slightly */
#energy-bar-container {
    position: absolute;
    top: 15px;
    /* Moved up to top bar area appropriately */
    left: 50%;
    transform: translateX(-50%);
    width: min(200px, 40%);
    /* Smaller to fit */
    height: 16px;
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid var(--neon-blue);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.3);
}

#energy-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-pink));
    transition: width 0.1s linear;
    /* Smooth linear for timer */
    box-shadow: 0 0 20px var(--neon-pink);
}

#energy-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 0.55rem;
    font-weight: 700;
    color: #fff;
    text-shadow: 0 0 5px #000;
    letter-spacing: 0.2em;
    pointer-events: none;
}

#energy-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-pink));
    transition: width 0.1s ease-out;
    box-shadow: 0 0 20px var(--neon-pink);
}

#energy-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 0.75rem;
    font-weight: 700;
    color: #fff;
    text-shadow: 0 0 5px #000, 0 0 10px #000;
    letter-spacing: 0.2em;
}

#phase-indicator {
    position: absolute;
    top: 120px;
    left: 50%;
    transform: translateX(-50%);
    font-size: clamp(1rem, 4vw, 1.5rem);
    font-weight: 700;
    color: var(--neon-blue);
    text-shadow: var(--glow-blue);
    letter-spacing: 0.4em;
    opacity: 0;
    transition: opacity 0.3s;
    white-space: nowrap;
}

#phase-indicator.show {
    opacity: 1;
    animation: phase-flash 0.5s ease-out;
}

@keyframes phase-flash {
    0% {
        transform: translateX(-50%) scale(1.5);
        opacity: 0;
    }

    50% {
        opacity: 1;
    }

    100% {
        transform: translateX(-50%) scale(1);
        opacity: 1;
    }
}

/* ===================================
   Upgrade Panel
=================================== */
#upgrade-panel {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    max-height: 60vh;
    padding: 15px;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.98), rgba(0, 0, 0, 0.9));
    border-top: 2px solid var(--neon-pink);
    box-shadow: 0 -10px 40px rgba(255, 0, 255, 0.3);
    z-index: 50;
    transition: transform 0.3s ease;
    pointer-events: auto;
    overflow-y: auto;
}

#upgrade-panel.hidden {
    transform: translateY(100%);
}

#upgrade-panel h2 {
    text-align: center;
    color: var(--neon-pink);
    text-shadow: var(--glow-pink);
    letter-spacing: 0.4em;
    margin-bottom: 15px;
    font-size: clamp(1rem, 4vw, 1.5rem);
}

.upgrade-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 15px;
    padding-bottom: 20px;
}

.upgrade-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--neon-blue);
    border-radius: 10px;
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    min-width: 100px;
    flex: 1;
    max-width: 140px;
}

.upgrade-icon {
    font-size: 1.5rem;
}

.upgrade-name {
    font-size: 0.75rem;
    color: var(--neon-blue);
    letter-spacing: 0.15em;
}

.upgrade-desc {
    font-size: 0.6rem;
    color: rgba(255, 255, 255, 0.5);
}

/* Enhanced upgrade stats visibility */
.upgrade-stats {
    background: rgba(0, 0, 0, 0.7);
    padding: 4px 8px;
    border-radius: 5px;
    margin: 4px 0;
    border: 1px solid rgba(0, 243, 255, 0.3);
}

.upgrade-stats .current-val {
    color: var(--neon-gold);
    font-weight: 700;
    text-shadow: 0 0 5px var(--neon-gold);
}

.upgrade-stats .arrow {
    color: rgba(255, 255, 255, 0.5);
    margin: 0 4px;
}

.upgrade-stats .next-val {
    color: var(--neon-green);
    font-weight: 700;
    text-shadow: 0 0 5px var(--neon-green);
}

.upgrade-level {
    font-size: 1rem;
    color: #fff;
}

.upgrade-cost {
    font-size: 0.7rem;
    color: var(--neon-gold);
}

.upgrade-btn {
    margin-top: 5px;
    padding: 5px 15px;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.7rem;
    color: var(--neon-green);
    background: transparent;
    border: 2px solid var(--neon-green);
    cursor: pointer;
    transition: all 0.2s;
    pointer-events: auto;
}

.upgrade-btn:hover,
.upgrade-btn:active {
    background: rgba(0, 255, 136, 0.2);
    box-shadow: 0 0 15px var(--neon-green);
}

.upgrade-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

#close-upgrade {
    display: block;
    margin: 15px auto 0;
    padding: 8px 25px;
    font-size: 0.9rem;
}

#open-upgrade {
    position: absolute;
    bottom: 20px;
    right: 20px;
    width: 60px;
    height: 60px;
    font-size: 1.5rem;
    background: rgba(0, 0, 0, 0.8);
    border: 2px solid var(--neon-gold);
    border-radius: 50%;
    cursor: pointer;
    z-index: 20;
    transition: all 0.3s;
    pointer-events: auto;
    color: var(--neon-gold);
    box-shadow: 0 0 15px rgba(255, 215, 0, 0.2);
}

#open-upgrade:hover,
#open-upgrade:active {
    transform: scale(1.1) rotate(15deg);
    box-shadow: 0 0 25px var(--neon-gold);
    background: rgba(20, 20, 20, 0.9);
}

#open-upgrade.hidden {
    display: none;
}

/* Note Legend */
#note-legend {
    position: absolute;
    bottom: 90px;
    left: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.6);
    pointer-events: none;
}

#note-legend.hidden {
    display: none;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    box-shadow: 0 0 5px currentColor;
}

.dot.pink {
    background: var(--neon-pink);
    color: var(--neon-pink);
}

.dot.green {
    background: var(--neon-green);
    color: var(--neon-green);
    clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
    border-radius: 0;
}

.dot.orange {
    background: var(--neon-orange);
    color: var(--neon-orange);
    border-radius: 2px;
}

/* ===================================
   Screen Shake Animation
=================================== */
.shake {
    animation: shake 0.1s ease-in-out;
}

@keyframes shake {

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

    25% {
        transform: translate(-5px, 5px);
    }

    50% {
        transform: translate(5px, -5px);
    }

    75% {
        transform: translate(-5px, -5px);
    }
}

/* ===================================
   Phase Transition
=================================== */
.euphoria-mode #energy-bar-container {
    border-color: var(--neon-pink);
    box-shadow: 0 0 20px rgba(255, 0, 255, 0.6);
}

.euphoria-mode #phase-indicator {
    color: var(--neon-pink);
    text-shadow: var(--glow-pink);
}

.euphoria-mode #stage-display {
    border-color: var(--neon-gold);
    animation: pulse-glow 0.8s ease-in-out infinite;
    top: 80px;
    /* Moves further down in euphoria */
}

/* ===================================
   Mobile Optimization
=================================== */
@media (max-width: 600px) {
    #top-bar {
        padding: 8px 10px;
    }

    #score-display .label,
    #gold-display .label {
        font-size: 0.55rem;
    }

    #score-display .value,
    #gold-display .value {
        font-size: 1rem;
    }

    #gold-display {
        margin-left: 10px;
    }

    #stage-display {
        padding: 4px 10px;
        top: 50px;
    }

    #stage-display .stage-num {
        font-size: 1rem;
    }

    #combo {
        font-size: 1.4rem;
    }

    .combo-label {
        font-size: 0.5rem;
    }

    #energy-bar-container {
        top: 38px;
        /* Fit between things */
        height: 8px;
        /* Thinner */
        width: 30%;
    }

    #energy-text {
        display: none;
        /* Hide text on mobile to save space */
    }

    #phase-indicator {
        top: 90px;
        font-size: 0.9rem;
        letter-spacing: 0.3em;
    }

    .game-title {
        letter-spacing: 0.08em;
    }

    .game-subtitle {
        letter-spacing: 0.15em;
    }

    .upgrade-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .upgrade-item {
        padding: 10px 8px;
    }

    .upgrade-icon {
        font-size: 1.4rem;
    }

    .upgrade-name {
        font-size: 0.65rem;
    }

    .upgrade-desc {
        font-size: 0.5rem;
        line-height: 1.2;
    }

    #open-upgrade {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }

    #note-legend {
        display: flex;
    }
}

@media (max-width: 380px) {
    #top-bar {
        padding: 5px;
    }

    #gold-display {
        margin-left: 5px;
    }

    #score-display .value,
    #gold-display .value {
        font-size: 0.9rem;
    }

    #energy-bar-container {
        top: 35px;
    }

    #stage-display {
        top: 45px;
    }
}

@media (max-width: 400px) {
    #top-bar {
        padding: 6px 8px;
    }

    #score-display .value {
        font-size: 1rem;
    }

    #combo {
        font-size: 1.2rem;
    }

    #energy-bar-container {
        top: 45px;
        width: 55%;
        height: 18px;
    }

    #phase-indicator {
        top: 72px;
        font-size: 0.8rem;
    }

    .upgrade-grid {
        gap: 8px;
    }

    .upgrade-item {
        min-width: 80px;
    }
}

/* Landscape mobile */
@media (max-height: 500px) {
    #top-bar {
        padding: 5px 15px;
    }

    #energy-bar-container {
        top: 10px;
        height: 10px;
    }

    #stage-display {
        top: 10px;
        /* Move to side or adjust */
        left: auto;
        right: 15px;
        transform: none;
        padding: 2px 8px;
    }

    #combo-display {
        display: none;
        /* Hide combo in landscape to save vertical space if needed */
    }

    #phase-indicator {
        top: 50px;
        font-size: 0.8rem;
    }

    #upgrade-panel {
        max-height: 85vh;
        padding: 10px;
    }

    .upgrade-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ===================================
   Safe Area (for notched phones)
=================================== */
@supports (padding-top: env(safe-area-inset-top)) {
    #top-bar {
        padding-top: max(10px, env(safe-area-inset-top));
        padding-left: max(10px, env(safe-area-inset-left));
        padding-right: max(10px, env(safe-area-inset-right));
    }

    #upgrade-panel {
        padding-bottom: max(20px, env(safe-area-inset-bottom));
        padding-left: max(20px, env(safe-area-inset-left));
        padding-right: max(20px, env(safe-area-inset-right));
    }

    #open-upgrade {
        bottom: max(20px, env(safe-area-inset-bottom));
        right: max(20px, env(safe-area-inset-right));
    }
}

/* ===================================
   Hidden Upgrades Section (Stage 30)
=================================== */
#hidden-upgrades-section {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid rgba(153, 102, 255, 0.3);
}

#hidden-upgrades-section .hidden-title {
    text-align: center;
    color: rgba(153, 102, 255, 0.6);
    font-size: 1rem;
    margin-bottom: 10px;
    letter-spacing: 0.2em;
}

#hidden-upgrades-section .unlock-hint {
    font-size: 0.7rem;
    color: rgba(255, 215, 0, 0.5);
    display: block;
    margin-top: 5px;
}

.hidden-grid {
    opacity: 0.4;
}

.hidden-grid.unlocked {
    opacity: 1;
}

.hidden-upgrade.locked {
    background: rgba(0, 0, 0, 0.6);
    border-color: rgba(100, 100, 100, 0.3);
    filter: grayscale(80%);
    pointer-events: none;
}

.hidden-upgrade.locked .upgrade-icon {
    filter: brightness(0.5);
}

.hidden-upgrade.locked .upgrade-name,
.hidden-upgrade.locked .upgrade-desc {
    color: rgba(150, 150, 150, 0.6);
}

.hidden-upgrade.locked .upgrade-level {
    color: rgba(255, 100, 100, 0.5);
    font-size: 0.7rem;
}

/* Unlocked state (when Stage >= 30) */
.hidden-upgrade.unlocked {
    background: rgba(153, 102, 255, 0.15);
    border-color: rgba(153, 102, 255, 0.6);
    filter: none;
    pointer-events: auto;
    animation: pulse-glow 2s ease-in-out infinite;
}

.hidden-upgrade.unlocked .upgrade-name {
    color: #9966ff;
    text-shadow: 0 0 10px rgba(153, 102, 255, 0.5);
}