/* ==========================================================================
   CHRONO-PORTAL SNAKE - STYLE SHEET
   ========================================================================== */

/* --- Custom Variables & Theme --- */
:root {
    --bg-dark: #070913;
    --card-bg: rgba(16, 20, 38, 0.6);
    --card-border: rgba(255, 255, 255, 0.08);
    --text-primary: #f1f3f9;
    --text-muted: #8b92b6;
    
    /* Neon Colors */
    --neon-orange: #ff6c00;
    --neon-orange-glow: rgba(255, 108, 0, 0.4);
    --neon-blue: #00d2ff;
    --neon-blue-glow: rgba(0, 210, 255, 0.4);
    --neon-pink: #ff007f;
    --neon-pink-glow: rgba(255, 0, 127, 0.4);
    --neon-green: #39ff14;
    --neon-green-glow: rgba(57, 255, 20, 0.4);
    --neon-red: #ff3131;
    --neon-red-glow: rgba(255, 49, 49, 0.4);
    --neon-gold: #ffbd00;
    
    /* UI Dimensions */
    --container-max-width: 1200px;
    --canvas-size: 600px;
}

/* --- Global Reset & Base Styling --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* --- Star Background & Glowing Orbs --- */
.stars-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(1px 1px at 20px 30px, #fff, rgba(0,0,0,0)),
        radial-gradient(1.5px 1.5px at 150px 80px, rgba(255,255,255,0.9), rgba(0,0,0,0)),
        radial-gradient(2px 2px at 300px 220px, #fff, rgba(0,0,0,0)),
        radial-gradient(1px 1px at 450px 350px, rgba(255,255,255,0.6), rgba(0,0,0,0)),
        radial-gradient(1.5px 1.5px at 600px 180px, #fff, rgba(0,0,0,0)),
        radial-gradient(2px 2px at 750px 480px, rgba(255,255,255,0.8), rgba(0,0,0,0));
    background-repeat: repeat;
    background-size: 800px 800px;
    opacity: 0.15;
    z-index: -3;
}

.glow-orb {
    position: fixed;
    border-radius: 50%;
    filter: blur(140px);
    opacity: 0.25;
    z-index: -2;
    pointer-events: none;
    transition: all 1s ease;
}

.orb-orange {
    top: -10%;
    left: 10%;
    width: 400px;
    height: 400px;
    background: var(--neon-orange);
    animation: orb-bounce 15s infinite alternate ease-in-out;
}

.orb-blue {
    bottom: -10%;
    right: 10%;
    width: 500px;
    height: 500px;
    background: var(--neon-blue);
    animation: orb-bounce 20s infinite alternate-reverse ease-in-out;
}

@keyframes orb-bounce {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(50px, 30px) scale(1.1); }
}

/* --- Container & Layout --- */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    z-index: 1;
}

/* --- Header --- */
.game-header {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    padding: 10px 0;
}

.back-link-container {
    justify-self: start;
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border);
    transition: all 0.3s ease;
}

.btn-back:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.05);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: 'Outfit', sans-serif;
    font-weight: 900;
    font-size: 1.8rem;
    letter-spacing: 2px;
}

.logo-sub {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.1);
    padding: 2px 8px;
    border-radius: 4px;
    letter-spacing: 1px;
    margin-left: 5px;
}

.header-status {
    justify-self: end;
}

.status-indicator {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    background: rgba(0, 210, 255, 0.1);
    color: var(--neon-blue);
    border: 1px solid rgba(0, 210, 255, 0.3);
    box-shadow: 0 0 10px rgba(0, 210, 255, 0.15);
    transition: all 0.4s ease;
}

.status-indicator.state-slow {
    background: rgba(139, 92, 246, 0.1);
    color: #a78bfa;
    border-color: rgba(139, 92, 246, 0.3);
    box-shadow: 0 0 10px rgba(139, 92, 246, 0.2);
}

.status-indicator.state-rewind {
    background: rgba(255, 0, 127, 0.15);
    color: var(--neon-pink);
    border-color: rgba(255, 0, 127, 0.4);
    box-shadow: 0 0 15px var(--neon-pink-glow);
    animation: flash 0.5s infinite alternate;
}

@keyframes flash {
    0% { opacity: 0.6; }
    100% { opacity: 1; }
}

/* --- Neon Glow Texts --- */
.neon-text-orange {
    color: var(--neon-orange);
    text-shadow: 0 0 10px var(--neon-orange-glow);
}

.neon-text-blue {
    color: var(--neon-blue);
    text-shadow: 0 0 10px var(--neon-blue-glow);
}

.neon-text-pink {
    color: var(--neon-pink);
    text-shadow: 0 0 10px var(--neon-pink-glow);
}

.neon-text-green {
    color: var(--neon-green);
    text-shadow: 0 0 10px var(--neon-green-glow);
}

.neon-text-red {
    color: var(--neon-red);
    text-shadow: 0 0 15px var(--neon-red-glow);
}

/* --- Glass Cards --- */
.glass-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 20px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

/* --- Game Layout --- */
.game-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 20px;
}

.panel-left {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* --- Scoreboard --- */
.scoreboard .score-row {
    display: flex;
    justify-content: space-between;
    gap: 15px;
}

.score-item {
    display: flex;
    flex-direction: column;
    flex: 1;
}

.scoreboard .label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 5px;
}

.digital-value {
    font-family: 'Orbitron', monospace;
    font-size: 1.8rem;
    font-weight: 700;
    line-height: 1;
}

/* --- Energy Panel --- */
.energy-panel .panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.energy-panel h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.energy-text {
    font-family: 'Orbitron', monospace;
    font-size: 1.1rem;
    font-weight: 700;
}

.energy-bar-container {
    position: relative;
    height: 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 12px;
}

.energy-bar-fill {
    height: 100%;
    border-radius: 6px;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-orange));
    box-shadow: 0 0 10px rgba(0, 210, 255, 0.5);
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.energy-bar-glow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
    animation: flow-glow 2s infinite linear;
    pointer-events: none;
}

@keyframes flow-glow {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.energy-threshold-marker {
    position: absolute;
    top: 0;
    left: 30%;
    width: 2px;
    height: 100%;
    background: var(--neon-pink);
    opacity: 0.8;
    box-shadow: 0 0 4px var(--neon-pink-glow);
}

.energy-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.4;
}

.energy-hint .highlight {
    color: var(--neon-orange);
    font-weight: 600;
}

.energy-hint .highlight-key {
    color: var(--neon-blue);
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    padding: 1px 5px;
    border-radius: 4px;
    font-family: inherit;
    font-weight: 600;
}

/* --- Settings Panel --- */
.settings-panel h3, .legend-panel h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    padding-bottom: 8px;
}

.setting-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

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

.setting-row label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.setting-row select {
    background: rgba(16, 20, 38, 0.9);
    color: var(--text-primary);
    border: 1px solid var(--card-border);
    padding: 6px 10px;
    border-radius: 6px;
    outline: none;
    font-size: 0.8rem;
    cursor: pointer;
    transition: border-color 0.3s;
}

.setting-row select:focus {
    border-color: var(--neon-blue);
}

/* Toggle Switch Custom */
.toggle-switch {
    position: relative;
    width: 44px;
    height: 22px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-switch label {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--card-border);
    border-radius: 22px;
    transition: .3s;
}

.toggle-switch label:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: var(--text-muted);
    border-radius: 50%;
    transition: .3s;
}

.toggle-switch input:checked + label {
    background-color: rgba(0, 210, 255, 0.15);
    border-color: rgba(0, 210, 255, 0.4);
}

.toggle-switch input:checked + label:before {
    transform: translateX(22px);
    background-color: var(--neon-blue);
    box-shadow: 0 0 8px var(--neon-blue-glow);
}

/* --- Legend Panel --- */
.legend-items {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

.legend-color {
    width: 14px;
    height: 14px;
    border-radius: 50%;
}

.portal-orange-dot {
    background: var(--neon-orange);
    box-shadow: 0 0 8px var(--neon-orange-glow);
}
.portal-blue-dot {
    background: var(--neon-blue);
    box-shadow: 0 0 8px var(--neon-blue-glow);
    margin-left: -5px; /* overlay effect */
}

.item-core {
    background: var(--neon-green);
    box-shadow: 0 0 8px var(--neon-green-glow);
}

.item-crystal {
    background: var(--neon-blue);
    box-shadow: 0 0 10px var(--neon-blue-glow);
    animation: pulse-blue 1.5s infinite alternate;
}

.item-singularity {
    background: #8b5cf6;
    box-shadow: 0 0 10px rgba(139, 92, 246, 0.7);
    border-radius: 4px; /* square diamond shape */
    transform: rotate(45deg);
    animation: rotate-pulse 2s infinite linear;
}

@keyframes pulse-blue {
    0% { transform: scale(0.9); box-shadow: 0 0 4px var(--neon-blue-glow); }
    100% { transform: scale(1.1); box-shadow: 0 0 12px var(--neon-blue); }
}

@keyframes rotate-pulse {
    0% { transform: rotate(0deg) scale(0.9); }
    50% { transform: rotate(180deg) scale(1.1); }
    100% { transform: rotate(360deg) scale(0.9); }
}

.legend-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* --- Center Screen / Canvas Board --- */
.game-center {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.canvas-container {
    position: relative;
    width: var(--canvas-size);
    height: var(--canvas-size);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5), 0 0 2px rgba(255,255,255,0.1);
    background: #020308;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

/* Canvas Board Glow */
#game-canvas {
    display: block;
    width: 100%;
    height: 100%;
    z-index: 1;
}

/* Screen Overlay Style (Start / Gameover) */
.screen-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(6, 8, 18, 0.9);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.4s ease, visibility 0.4s;
}

.screen-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.overlay-content {
    max-width: 450px;
    padding: 30px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.overlay-content h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 2.5rem;
    font-weight: 900;
    letter-spacing: 3px;
    text-transform: uppercase;
}

.overlay-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.tutorial-box {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 12px;
    padding: 15px;
    font-size: 0.8rem;
    text-align: left;
    color: var(--text-muted);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.tutorial-box strong {
    color: var(--text-primary);
}

.key {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 1px 6px;
    border-radius: 4px;
    font-family: monospace;
    font-weight: bold;
    color: var(--neon-blue);
}

/* Buttons */
.btn {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: 1rem;
    padding: 12px 28px;
    border-radius: 30px;
    cursor: pointer;
    border: none;
    outline: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    letter-spacing: 1px;
}

.btn-primary {
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-orange));
    color: #fff;
    box-shadow: 0 4px 15px rgba(0, 210, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 210, 255, 0.5), 0 0 15px rgba(255, 108, 0, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

/* Stats report on Gameover */
.stats-report {
    display: flex;
    flex-direction: column;
    gap: 10px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 12px;
    padding: 18px;
    width: 100%;
}

.stats-report p {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.font-digital {
    font-family: 'Orbitron', monospace;
    font-weight: 700;
}

/* --- Mobile Controls Panel --- */
.mobile-controls {
    display: none; /* Hidden on desktop */
    margin-top: 20px;
    flex-direction: column;
    gap: 8px;
    align-items: center;
}

.dpad-row {
    display: flex;
    gap: 15px;
    justify-content: center;
    align-items: center;
}

.dpad-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
    transition: all 0.2s;
}

.dpad-btn:active {
    background: rgba(0, 210, 255, 0.2);
    border-color: var(--neon-blue);
    box-shadow: 0 0 15px var(--neon-blue-glow);
    transform: scale(0.95);
}

.dpad-btn.action-btn {
    width: 70px;
    height: 70px;
    border-radius: 18px;
    font-size: 1rem;
    flex-direction: column;
    gap: 2px;
    background: rgba(255, 0, 127, 0.08);
    border-color: rgba(255, 0, 127, 0.3);
}

.dpad-btn.action-btn:active {
    background: rgba(255, 0, 127, 0.2);
    border-color: var(--neon-pink);
    box-shadow: 0 0 15px var(--neon-pink-glow);
}

.dpad-btn.action-btn span {
    font-size: 0.6rem;
    font-weight: bold;
    text-transform: uppercase;
}

/* --- Timeline Rewind Effect Overlay --- */
.rewind-effect-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    background: rgba(16, 12, 38, 0.3);
    pointer-events: none;
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.rewind-effect-overlay.active {
    opacity: 1;
    animation: ScreenShake 0.15s infinite;
}

.scanlines {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 210, 255, 0.25) 50%), linear-gradient(90deg, rgba(255, 0, 0, 0.06), rgba(0, 255, 0, 0.02), rgba(0, 0, 255, 0.06));
    background-size: 100% 4px, 6px 100%;
}

.rewind-status-text {
    font-family: 'Orbitron', sans-serif;
    font-weight: 900;
    font-size: 3rem;
    color: var(--neon-pink);
    text-shadow: 0 0 20px var(--neon-pink), 0 0 40px #ff00ea;
    letter-spacing: 4px;
    animation: RewindTextPulse 0.5s infinite alternate ease-in-out;
}

@keyframes ScreenShake {
    0% { transform: translate(1px, 1px) rotate(0deg); }
    10% { transform: translate(-1px, -2px) rotate(-1deg); }
    20% { transform: translate(-3px, 0px) rotate(1deg); }
    30% { transform: translate(0px, 2px) rotate(0deg); }
    40% { transform: translate(1px, -1px) rotate(1deg); }
    50% { transform: translate(-1px, 2px) rotate(-1deg); }
    60% { transform: translate(-3px, 1px) rotate(0deg); }
    70% { transform: translate(2px, 1px) rotate(-1deg); }
    80% { transform: translate(-1px, -1px) rotate(1deg); }
    90% { transform: translate(2px, 2px) rotate(0deg); }
    100% { transform: translate(1px, -2px) rotate(-1deg); }
}

@keyframes RewindTextPulse {
    0% { transform: scale(0.95); opacity: 0.7; }
    100% { transform: scale(1.05); opacity: 1; }
}

/* --- Responsive Adjustments --- */
@media (max-width: 992px) {
    body {
        padding: 10px;
    }
    
    .game-layout {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .panel-left {
        order: 2;
    }
    
    .game-center {
        order: 1;
    }
    
    .canvas-container {
        width: 100%;
        max-width: 500px;
        height: auto;
        aspect-ratio: 1;
    }
    
    .game-header {
        grid-template-columns: 1fr 1fr;
    }
    
    .header-status {
        display: none;
    }
    
    .mobile-controls {
        display: flex; /* Show virtual D-pad on tablets & phones */
    }
}

@media (max-width: 500px) {
    .container {
        padding: 10px 5px;
        gap: 10px;
    }
    
    .logo {
        font-size: 1.4rem;
    }
    
    .logo-sub {
        font-size: 0.9rem;
    }
    
    .overlay-content h2 {
        font-size: 1.8rem;
    }
}