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

:root {
    --bg-color: #05050a;
    --player-color: #00f2ff;
    --accent-color: #bc13fe;
    --obstacle-color: #1a1a2e;
    --goal-color: #39ff14;
    --text-color: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.1);
    --neon-glow: 0 0 15px var(--player-color);
}

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

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

body::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.25) 50%), linear-gradient(90deg, rgba(255, 0, 0, 0.06), rgba(0, 255, 0, 0.02), rgba(0, 0, 255, 0.06));
    z-index: 20;
    background-size: 100% 4px, 3px 100%;
    pointer-events: none;
    opacity: 0.3;
}

#game-container {
    position: fixed; /* Use fixed for better mobile full-screen */
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

canvas {
    background: radial-gradient(circle at center, #0a0a1f 0%, #05050a 100%);
    display: block;
    width: 100%;
    height: 100%;
}

/* UI Overlays */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: rgba(5, 5, 10, 0.8);
    backdrop-filter: blur(10px);
    z-index: 10;
    transition: opacity 0.5s ease;
}

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

.menu-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 3rem;
    border-radius: 24px;
    text-align: center;
    width: 90%;
    max-width: 600px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    max-height: 85vh;
    overflow-y: auto;
    position: relative;
    animation: cardEntrance 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes cardEntrance {
    from { opacity: 0; transform: scale(0.9) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

/* Briefing Screen Mobile Layout */
#briefing-screen .menu-card {
    display: flex;
    flex-direction: row;
    gap: 40px;
    text-align: left;
}

@media (max-width: 768px) {
    #briefing-screen .menu-card {
        flex-direction: column;
        gap: 20px;
        padding: 1.5rem;
    }
    
    #briefing-screen .menu-card > div:last-child {
        border-left: none !important;
        border-top: 1px solid var(--glass-border);
        padding-left: 0 !important;
        padding-top: 20px;
    }
}

h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: clamp(1.5rem, 8vw, 3.5rem);
    font-weight: 900;
    margin-bottom: 1rem;
    background: linear-gradient(to right, var(--player-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-transform: uppercase;
    letter-spacing: 4px;
    animation: titlePulse 4s ease-in-out infinite;
    text-shadow: 2px 0 var(--accent-color), -2px 0 var(--player-color);
}

.glitch {
    animation: glitch 1s linear infinite;
}

@keyframes glitch {
    2%, 64% { transform: translate(2px, 0) skew(0deg); }
    4%, 60% { transform: translate(-2px, 0) skew(0deg); }
    62% { transform: translate(0, 0) skew(5deg); }
}

@keyframes titlePulse {
    0%, 100% { transform: scale(1); filter: brightness(1) drop-shadow(0 0 10px rgba(0, 242, 255, 0.5)); }
    50% { transform: scale(1.05); filter: brightness(1.2) drop-shadow(0 0 20px rgba(188, 19, 254, 0.8)); }
}

p {
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 2rem;
    opacity: 0.8;
}

/* Level Chart */
.level-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
    gap: 10px;
    margin: 20px 0;
    max-height: 400px;
    overflow-y: auto;
    padding: 15px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 10px;
    border: 1px solid var(--glass-border);
}

.level-node {
    width: 45px;
    height: 45px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    font-family: 'Orbitron', sans-serif;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
    user-select: none;
}

.level-node:hover {
    background: rgba(0, 242, 255, 0.2);
    border-color: var(--player-color);
    transform: scale(1.1);
}

.level-node.completed {
    background: rgba(57, 255, 20, 0.1);
    border-color: var(--goal-color);
    color: var(--goal-color);
}

.level-node.current {
    background: rgba(0, 242, 255, 0.2);
    border-color: var(--player-color);
    box-shadow: 0 0 15px var(--player-color);
    animation: nodePulse 2s infinite;
}

.level-node.locked {
    opacity: 0.5;
}

.level-node.unlocking {
    animation: unlockGlow 1.5s forwards;
}

@keyframes nodePulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

@keyframes unlockGlow {
    0% { border-color: var(--glass-border); transform: scale(1); }
    50% { border-color: var(--player-color); transform: scale(1.3); box-shadow: 0 0 30px var(--player-color); }
    100% { border-color: var(--player-color); transform: scale(1); box-shadow: 0 0 15px var(--player-color); }
}

/* Settings Switches */
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--glass-border);
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--player-color);
    box-shadow: 0 0 10px var(--player-color);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.setting-item span {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.8rem;
    letter-spacing: 1px;
    opacity: 0.8;
}

.btn {
    padding: 1rem 2rem;
    font-family: 'Orbitron', sans-serif;
    font-size: 1rem;
    font-weight: 900;
    color: white;
    background: linear-gradient(135deg, var(--player-color), var(--accent-color));
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-transform: uppercase;
    letter-spacing: 2px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 242, 255, 0.2);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 242, 255, 0.4);
    filter: brightness(1.1);
}

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

/* Form Styles */
.input-group {
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.field-wrap {
    position: relative;
    width: 100%;
}

#auth-email, #auth-pass {
    width: 100%;
    padding: 0.7rem;
    padding-right: 65px;
    font-family: 'Orbitron', sans-serif;
    font-size: 16px; /* Critical to prevent iOS auto-zoom */
    color: var(--text-color);
    background: rgba(0, 0, 0, 0.4);
    border: 2px solid var(--glass-border);
    border-radius: 8px;
    outline: none;
    text-align: center;
    transition: all 0.3s;
    letter-spacing: 2px;
}

#auth-email:focus, #auth-pass:focus {
    border-color: var(--player-color);
    box-shadow: 0 0 15px rgba(0, 242, 255, 0.3);
}

.field-toggle {
    position: absolute;
    right: 5px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.05);
    border: none;
    border-left: 1px solid var(--glass-border); /* Distinct separator */
    color: var(--player-color);
    cursor: pointer;
    font-size: 0.6rem;
    font-family: 'Orbitron', sans-serif;
    font-weight: 900;
    z-index: 10;
    letter-spacing: 1px;
    height: 70%;
    width: 55px;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.2s;
}

.field-toggle:hover {
    background: rgba(0, 242, 255, 0.1);
    color: white;
}

.auth-compact {
    max-width: 400px;
}

.auth-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 10px;
}

.auth-actions .btn {
    flex: 1;
    padding: 0.8rem;
    font-size: 1rem;
}

.auth-divider {
    margin: 1.5rem 0;
    height: 1px;
    background: var(--glass-border);
    position: relative;
}

.auth-divider::after {
    content: 'OR';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--bg-color);
    padding: 0 10px;
    font-size: 0.7rem;
    font-family: 'Orbitron', sans-serif;
    color: rgba(255, 255, 255, 0.3);
}

.btn.secondary {
    width: 100%;
    background: transparent;
    border: 1px solid var(--glass-border);
    font-size: 0.9rem;
    padding: 0.8rem 1.5rem;
}

.btn.secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    box-shadow: none;
}

.error-text {
    color: #ff3333;
    font-size: 0.8rem;
    min-height: 1rem;
    margin-top: 5px;
}

/* HUD */
#hud {
    position: absolute;
    top: 10px;
    left: 10px;
    right: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    pointer-events: none;
    z-index: 5;
    justify-content: flex-start;
}

.stat-box {
    background: rgba(0, 0, 0, 0.6);
    padding: 0.6rem 1.2rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    font-family: 'Orbitron', sans-serif;
    font-size: 0.75rem;
    color: var(--player-color);
    backdrop-filter: blur(10px);
    letter-spacing: 1px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

/* Distinct Button Styles in HUD */
#pause-btn, #mute-btn {
    pointer-events: auto !important;
    cursor: pointer !important;
    transition: all 0.2s ease;
    background: rgba(0, 242, 255, 0.1);
}

#pause-btn:hover {
    background: var(--player-color);
    color: var(--bg-color);
    box-shadow: 0 0 15px var(--player-color);
}

#mute-btn {
    background: rgba(188, 19, 254, 0.1);
    color: var(--accent-color);
    border-color: var(--accent-color);
}

#mute-btn:hover {
    background: var(--accent-color);
    color: white;
    box-shadow: 0 0 15px var(--accent-color);
}

/* Gravity Indicator */
#gravity-indicator {
    position: absolute;
    bottom: 40px;
    right: 40px;
    width: 60px;
    height: 60px;
    border: 2px solid var(--glass-border);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 5;
}

#gravity-arrow {
    width: 2px;
    height: 30px;
    background: var(--accent-color);
    position: relative;
    transform-origin: bottom center;
}

#gravity-arrow::after {
    content: '';
    position: absolute;
    top: 0;
    left: -4px;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-bottom: 8px solid var(--accent-color);
    transform: rotate(180deg);
}

/* Mobile Optimizations */
@media (max-width: 768px) {
    .menu-card {
        width: 95%;
        padding: 1.5rem;
    }
    
    h1 { font-size: 1.6rem !important; }
    p { font-size: 0.8rem !important; }
    
    .level-grid {
        grid-template-columns: repeat(5, 1fr);
        max-height: 300px;
        gap: 8px;
    }
    
    .level-node {
        width: 40px;
        height: 40px;
        font-size: 0.7rem;
    }
    
    .stat-box {
        padding: 0.3rem 0.6rem;
        font-size: 0.6rem;
    }
    
    #gravity-indicator {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
    
    #gravity-arrow { height: 18px; }

    #splash-text { font-size: 2.5rem !important; }
    
    .auth-actions {
        flex-direction: column;
        gap: 10px;
    }
}

/* Smooth Scrolling & Polish */
* {
    -webkit-overflow-scrolling: touch;
    -webkit-tap-highlight-color: transparent;
}

::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: rgba(0,0,0,0.1);
}
::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 10px;
}