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

body {
    overflow: hidden;
    background: #000;
    font-family: 'Rajdhani', sans-serif;
    -webkit-font-smoothing: antialiased;
    user-select: none;
}

/* ===== TITLE SCREEN ===== */
#title-screen {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 10000;
    /* 흑백톤에 아주 약간의 푸른빛(채도 낮음) */
    background: radial-gradient(ellipse at 50% 50%, #111112 0%, #050505 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.title-bg-effect {
    position: absolute;
    width: 100%; height: 100%;
    /* 흑백톤에 아주 약간의 색상만 남김 */
    background: 
        radial-gradient(circle at 20% 30%, rgba(150,150,155,0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(150,150,155,0.05) 0%, transparent 50%);
    animation: bgPulse 4s ease-in-out infinite alternate;
}

@keyframes bgPulse {
    0% { opacity: 0.5; }
    100% { opacity: 1; }
}

.scanlines {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0,0,0,0.15) 2px,
        rgba(0,0,0,0.15) 4px
    );
    pointer-events: none;
    z-index: 2;
}

.title-content {
    position: relative;
    z-index: 3;
    text-align: center;
}

.title-glitch {
    font-family: 'Orbitron', sans-serif;
    font-size: clamp(4rem, 12vw, 8rem);
    font-weight: 900;
    color: #00dbde;
    text-shadow: 
        0 0 20px rgba(0,219,222,0.5),
        0 0 60px rgba(0,219,222,0.3),
        0 0 120px rgba(0,219,222,0.1);
    letter-spacing: 0.15em;
    animation: titleGlow 2s ease-in-out infinite alternate;
    position: relative;
}

.title-glitch::before,
.title-glitch::after {
    content: attr(data-text);
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
}

.title-glitch::before {
    color: #fc00ff;
    z-index: -1;
    animation: glitch1 3s infinite;
}

.title-glitch::after {
    color: #00ff41;
    z-index: -2;
    animation: glitch2 2s infinite;
}

@keyframes glitch1 {
    0%, 90%, 100% { clip-path: inset(0 0 0 0); transform: translate(0); }
    92% { clip-path: inset(20% 0 40% 0); transform: translate(-3px, 1px); }
    94% { clip-path: inset(60% 0 10% 0); transform: translate(3px, -1px); }
    96% { clip-path: inset(40% 0 30% 0); transform: translate(-2px, 2px); }
    98% { clip-path: inset(10% 0 70% 0); transform: translate(2px, -2px); }
}

@keyframes glitch2 {
    0%, 88%, 100% { clip-path: inset(0 0 0 0); transform: translate(0); }
    90% { clip-path: inset(30% 0 30% 0); transform: translate(2px, -1px); }
    93% { clip-path: inset(50% 0 20% 0); transform: translate(-2px, 1px); }
    96% { clip-path: inset(10% 0 60% 0); transform: translate(1px, 2px); }
}

@keyframes titleGlow {
    0% { text-shadow: 0 0 20px rgba(0,219,222,0.5), 0 0 60px rgba(0,219,222,0.3); }
    100% { text-shadow: 0 0 30px rgba(0,219,222,0.8), 0 0 80px rgba(0,219,222,0.5), 0 0 140px rgba(0,219,222,0.2); }
}

.title-sub {
    font-family: 'Orbitron', sans-serif;
    font-size: clamp(2rem, 6vw, 4rem);
    font-weight: 700;
    color: #fc00ff;
    text-shadow: 
        0 0 15px rgba(252,0,255,0.5),
        0 0 40px rgba(252,0,255,0.3);
    letter-spacing: 0.4em;
    margin-top: -10px;
    animation: subGlow 2s ease-in-out infinite alternate-reverse;
}

@keyframes subGlow {
    0% { opacity: 0.7; }
    100% { opacity: 1; }
}

.title-desc {
    font-size: 1.2rem;
    color: rgba(255,255,255,0.5);
    margin-top: 20px;
    letter-spacing: 0.2em;
}

.title-controls {
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.control-item {
    font-size: 0.95rem;
    color: rgba(255,255,255,0.4);
    display: flex;
    align-items: center;
    gap: 6px;
}

.key {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    min-width: 28px;
    height: 28px;
    padding: 0 6px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 5px;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.7rem;
    color: #00dbde;
}

/* Neon Button */
.neon-btn {
    position: relative;
    margin-top: 40px;
    padding: 16px 60px;
    background: transparent;
    border: 2px solid #00dbde;
    border-radius: 50px;
    cursor: pointer;
    overflow: hidden;
    transition: all 0.3s ease;
}

.neon-btn .btn-text {
    position: relative;
    z-index: 2;
    font-family: 'Orbitron', sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    color: #00dbde;
    letter-spacing: 0.1em;
    transition: color 0.3s ease;
}

.label {
    font-family: 'Rajdhani', sans-serif;
    font-size: 0.75rem;
    font-weight: 700;
    color: #00dbde;
    letter-spacing: 0.1em;
    text-shadow: 0 0 5px rgba(0, 219, 222, 0.5);
}

.neon-btn .btn-glow {
    position: absolute;
    top: 0; left: -100%;
    width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0,219,222,0.3), transparent);
    transition: left 0.5s ease;
}

.neon-btn:hover {
    background: rgba(0,219,222,0.15);
    box-shadow: 
        0 0 20px rgba(0,219,222,0.3),
        0 0 40px rgba(0,219,222,0.1),
        inset 0 0 20px rgba(0,219,222,0.1);
    transform: scale(1.05);
}

.neon-btn:hover .btn-glow {
    left: 100%;
}

.neon-btn:hover .btn-text {
    color: #fff;
}

.neon-btn:active {
    transform: scale(0.98);
}

.high-score-display {
    margin-top: 25px;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.9rem;
    color: rgba(255,235,59,0.6);
    letter-spacing: 0.15em;
}

/* ===== GAME SCREEN ===== */
#game-wrap {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 9999;
    background: #000;
    overflow: hidden;
    cursor: crosshair;
}

#gameCanvas {
    display: block;
    /* Extra subtle glow bloom that canvas struggles with natively */
    filter: drop-shadow(0 0 10px rgba(0, 219, 222, 0.2)) drop-shadow(0 0 20px rgba(252, 0, 255, 0.15));
    transition: filter 0.1s ease;
}

/* Chromatic Aberration Effect (Triggered on hit) */
#gameCanvas.glitch-effect {
    animation: rgbSplit 0.3s ease-out;
}

@keyframes rgbSplit {
    0% { filter: drop-shadow(-10px 0 0 rgba(255,0,0,0.8)) drop-shadow(10px 0 0 rgba(0,255,255,0.8)); transform: translate(5px, -5px); }
    30% { filter: drop-shadow(10px 0 0 rgba(255,0,0,0.8)) drop-shadow(-10px 0 0 rgba(0,255,255,0.8)); transform: translate(-5px, 5px); }
    60% { filter: drop-shadow(-5px 0 0 rgba(255,0,0,0.5)) drop-shadow(5px 0 0 rgba(0,255,255,0.5)); transform: translate(2px, -2px); }
    100% { filter: drop-shadow(0 0 10px rgba(0, 219, 222, 0.2)) drop-shadow(0 0 20px rgba(252, 0, 255, 0.15)); transform: translate(0, 0); }
}

/* HUD */
#ui-layer {
    position: absolute;
    top: 25px;
    left: 30px;
    pointer-events: none;
    z-index: 10;
    
    background: rgba(10, 10, 10, 0.4);
    padding: 15px 25px;
    border-radius: 12px;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    border: 1px solid rgba(0, 219, 222, 0.15);
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

#score-board {
    display: flex;
    align-items: baseline;
    gap: 10px;
}

.score-label {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.75rem;
    font-weight: 400;
    color: rgba(0,219,222,0.6);
    letter-spacing: 0.2em;
}

.score-value {
    font-family: 'Orbitron', sans-serif;
    font-size: 2.4rem;
    font-weight: 900;
    color: #00dbde;
    text-shadow: 0 0 15px rgba(0,219,222,0.5);
    line-height: 1;
}

.score-unit {
    font-size: 1.2rem;
    font-weight: 400;
    color: rgba(0,219,222,0.6);
    margin-left: 2px;
}

#life-#score-board {
    margin-bottom: 12px;
}

#dash-status {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 10px;
}

.dash-bar {
    width: 100px;
    height: 6px;
    background: rgba(255,255,255,0.1);
    border-radius: 3px;
    overflow: hidden;
    border: 1px solid rgba(0,219,222,0.2);
}

#dash-fill {
    height: 100%;
    width: 0%;
    background: #00dbde;
    box-shadow: 0 0 20px #00dbde;
    transition: width 0.1s linear, background 0.3s ease;
}

/* ===== TIPS OVERLAY ===== */
#tips-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 25000;
    display: flex;
    justify-content: center;
    align-items: center;
}

.tips-modal {
    background: rgba(10, 10, 15, 0.95);
    border: 2px solid #00dbde;
    box-shadow: 0 0 30px rgba(0, 219, 222, 0.4), inset 0 0 20px rgba(0, 219, 222, 0.1);
    width: 80%;
    max-width: 800px;
    height: 85%;
    max-height: 800px;
    padding: 30px 40px;
    border-radius: 10px;
    overflow-y: auto;
    position: relative;
    color: #eee;
}

/* Custom Scrollbar for Tips */
.tips-modal::-webkit-scrollbar { width: 8px; }
.tips-modal::-webkit-scrollbar-track { background: rgba(0, 219, 222, 0.1); border-radius: 4px; }
.tips-modal::-webkit-scrollbar-thumb { background: #00dbde; border-radius: 4px; }
.tips-modal::-webkit-scrollbar-thumb:hover { background: #fff; }

.tips-title {
    font-size: 2.5rem;
    color: #00dbde;
    text-shadow: 0 0 10px rgba(0, 219, 222, 0.8);
    text-align: center;
    margin-bottom: 30px;
    letter-spacing: 3px;
    border-bottom: 1px solid rgba(0, 219, 222, 0.3);
    padding-bottom: 15px;
}

.close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: transparent;
    color: #ff1744;
    border: 1px solid #ff1744;
    padding: 5px 15px;
    font-family: 'Orbitron', sans-serif;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.close-btn:hover {
    background: rgba(255, 23, 68, 0.2);
    box-shadow: 0 0 10px rgba(255, 23, 68, 0.5);
    color: #fff;
}

.tips-section {
    margin-bottom: 30px;
    line-height: 1.6;
}

.tips-section h3 {
    color: #fc00ff;
    font-size: 1.5rem;
    margin-bottom: 15px;
    text-shadow: 0 0 5px rgba(252, 0, 255, 0.5);
}

.tips-section ul {
    list-style: none;
    padding-left: 10px;
}

.tips-section li {
    margin-bottom: 8px;
    position: relative;
    padding-left: 20px;
    font-size: 1.1rem;
}

.tips-section li::before {
    content: "►";
    position: absolute;
    left: 0;
    color: #00dbde;
    font-size: 0.8rem;
    top: 4px;
}

.enemy-list li {
    background: rgba(255, 255, 255, 0.03);
    padding: 8px 10px 8px 25px;
    border-radius: 4px;
    border-left: 2px solid rgba(255,255,255,0.1);
    transition: background 0.2s;
}
.enemy-list li:hover { background: rgba(255, 255, 255, 0.1); }
.enemy-list.hazard li { border-left-color: #ff1744; }

.e-color {
    display: inline-block;
    width: 20px;
    text-align: center;
    margin-right: 5px;
    text-shadow: 0 0 5px currentColor;
}
#dash-fill.ready {
    background: #fff;
    box-shadow: 0 0 15px #fff;
}

#life-counter {
    margin-top: 10px;
}

.life-hearts {
    display: flex;
    gap: 6px;
}

.heart {
    width: 22px;
    height: 22px;
    position: relative;
    transition: all 0.3s ease;
}

.heart svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 0 6px rgba(255,71,87,0.6));
}

.heart.lost svg {
    opacity: 0.15;
    filter: none;
}

.heart.hit {
    animation: heartHit 0.3s ease;
}

@keyframes heartHit {
    0% { transform: scale(1); }
    50% { transform: scale(1.5); }
    100% { transform: scale(1); }
}

#pattern-status {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.7rem;
    color: rgba(255,235,59,0.7);
    letter-spacing: 0.15em;
    margin-top: 12px;
    transition: all 0.3s ease;
}

#difficulty-indicator {
    margin-top: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.diff-label {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.6rem;
    color: rgba(255,255,255,0.3);
    letter-spacing: 0.15em;
}

.diff-bar {
    width: 80px;
    height: 4px;
    background: rgba(255,255,255,0.1);
    border-radius: 2px;
    overflow: hidden;
}

.diff-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #00dbde, #fc00ff);
    border-radius: 2px;
    transition: width 0.5s ease;
    box-shadow: 0 0 10px rgba(252, 0, 255, 0.6);
}

#best-score-hud {
    position: absolute;
    top: 25px;
    right: 30px;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.8rem;
    color: rgba(255,235,59,0.5);
    letter-spacing: 0.1em;
    pointer-events: none;
    z-index: 10;
    
    background: rgba(10, 10, 10, 0.4);
    padding: 10px 15px;
    border-radius: 8px;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 235, 59, 0.15);
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
}

/* Hit Overlay */
#hit-overlay {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    z-index: 5;
    opacity: 0;
    background: radial-gradient(ellipse at center, transparent 30%, rgba(255,0,0,0.4) 100%);
    transition: opacity 0.1s ease;
}

#hit-overlay.active {
    opacity: 1;
}

/* Warning Flash */
#warning-flash {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    z-index: 4;
    opacity: 0;
    border: 3px solid rgba(255,0,0,0.5);
    transition: opacity 0.2s ease;
}

#warning-flash.active {
    opacity: 1;
    animation: warningPulse 0.5s ease infinite;
}

@keyframes warningPulse {
    0%, 100% { border-color: rgba(255,0,0,0.5); }
    50% { border-color: rgba(255,0,0,0.1); }
}

/* ===== GAME OVER ===== */
#game-over {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0,0,0,0);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 20;
    backdrop-filter: blur(0px);
    transition: background 0.5s ease, backdrop-filter 0.5s ease;
}

#game-over.visible {
    background: rgba(0,0,0,0.85);
    backdrop-filter: blur(5px);
}

.go-content {
    text-align: center;
    opacity: 0;
    transform: scale(0.8) translateY(20px);
    transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

#game-over.visible .go-content {
    opacity: 1;
    transform: scale(1) translateY(0);
}

.go-glitch {
    font-family: 'Orbitron', sans-serif;
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 900;
    color: #ff0000;
    text-shadow: 
        0 0 20px rgba(255,0,0,0.5),
        0 0 60px rgba(255,0,0,0.3);
    letter-spacing: 0.1em;
    animation: goGlitch 0.1s infinite;
    position: relative;
}

.go-glitch::before {
    content: attr(data-text);
    position: absolute;
    top: 0; left: 0;
    color: #00dbde;
    z-index: -1;
    animation: glitch1 1s infinite;
}

@keyframes goGlitch {
    0%, 95% { transform: translate(0); }
    96% { transform: translate(-2px, 1px); }
    97% { transform: translate(2px, -1px); }
    98% { transform: translate(-1px, -1px); }
    99% { transform: translate(1px, 1px); }
}

.go-stats {
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
}

.go-stat {
    display: flex;
    gap: 15px;
    align-items: baseline;
}

.go-stat-label {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.8rem;
    color: rgba(255,255,255,0.4);
    letter-spacing: 0.1em;
}

.go-stat-label.new-record {
    color: #ffeb3b;
    font-size: 1rem;
    animation: recordPulse 0.8s ease infinite alternate;
}

@keyframes recordPulse {
    0% { text-shadow: 0 0 10px rgba(255,235,59,0.3); }
    100% { text-shadow: 0 0 25px rgba(255,235,59,0.8), 0 0 40px rgba(255,235,59,0.4); }
}

.go-stat-value {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.8rem;
    font-weight: 700;
    color: #00dbde;
    text-shadow: 0 0 10px rgba(0,219,222,0.5);
}

.retry-btn {
    margin-top: 30px;
}

.menu-btn {
    margin-top: 12px;
    border-color: rgba(255,255,255,0.3);
}

.menu-btn .btn-text {
    color: rgba(255,255,255,0.5);
    font-size: 0.85rem;
}

.menu-btn:hover {
    border-color: rgba(255,255,255,0.6);
    background: rgba(255,255,255,0.05);
    box-shadow: none;
}

.menu-btn:hover .btn-text {
    color: rgba(255,255,255,0.9);
}

/* ===== SCREEN SHAKE ===== */
.screen-shake {
    animation: shake 0.15s ease;
}

@keyframes shake {
    0%, 100% { transform: translate(0); }
    25% { transform: translate(-4px, 2px); }
    50% { transform: translate(3px, -3px); }
    75% { transform: translate(-2px, 1px); }
}