:root {
    --bg-dark: #05050a;
    --bg-panel: rgba(15, 20, 30, 0.7);
    --neon-blue: #00f0ff;
    --neon-pink: #ff003c;
    --neon-yellow: #fcee0a;
    --text-main: #e0e6ed;
    --text-muted: #6b7280;
    --grid-color: rgba(0, 240, 255, 0.1);
    
    --border-glow: 0 0 10px rgba(0, 240, 255, 0.4), inset 0 0 10px rgba(0, 240, 255, 0.1);
    --neon-glow-blue: 0 0 15px rgba(0, 240, 255, 0.6);
    --neon-glow-pink: 0 0 15px rgba(255, 0, 60, 0.6);
    --neon-glow-yellow: 0 0 15px rgba(252, 238, 10, 0.6);
}

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

html, body {
    min-height: 100%;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
    overflow-x: hidden;
    overflow-y: auto;
    /* Basic CRT scanline effect via background repeating linear-gradient */
    background-image: 
        linear-gradient(rgba(0, 0, 0, 0.05) 50%, rgba(0, 0, 0, 0.15) 50%),
        linear-gradient(90deg, rgba(255,0,0,0.03), rgba(0,255,0,0.01), rgba(0,0,255,0.03));
    background-size: 100% 4px, 6px 100%;
}

body.in-battle {
    overflow: hidden;
}

#game-container {
    width: 100%;
    min-height: 100dvh;
    height: auto;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: stretch;
}

.screen {
    width: 100%;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

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

.screen {
    width: 100%;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    transition: opacity 0.5s ease;
}

header {
    background: var(--bg-panel);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--neon-blue);
    padding: 1rem 2rem;
    box-shadow: var(--border-glow);
    z-index: 10;
}

header h1 {
    font-weight: 900;
    letter-spacing: 2px;
    color: var(--neon-blue);
    text-shadow: 0 0 8px var(--neon-blue);
    font-size: 1.5rem;
    margin: 0;
}

.builder-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
    min-height: 0;
}

/* Side Panels */
aside {
    width: 300px;
    background: var(--bg-panel);
    backdrop-filter: blur(10px);
    border-right: 1px solid rgba(0, 240, 255, 0.2);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    z-index: 5;
}

aside.stats-panel {
    border-right: none;
    border-left: 1px solid rgba(0, 240, 255, 0.2);
}

aside h3 {
    color: var(--neon-yellow);
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    border-bottom: 1px solid var(--neon-yellow);
    padding-bottom: 0.5rem;
}

.part-selector {
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    background: rgba(255, 255, 255, 0.05);
    border-left: 3px solid var(--text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.9rem;
}

.part-selector:hover {
    background: rgba(0, 240, 255, 0.1);
    border-left-color: var(--neon-blue);
}

.part-selector.active {
    background: rgba(0, 240, 255, 0.2);
    border-left-color: var(--neon-blue);
    color: var(--neon-blue);
    text-shadow: 0 0 5px var(--neon-blue);
}

.part-selector.special {
    border-left-color: var(--neon-pink);
}

.part-selector.special.active {
    background: rgba(255, 0, 60, 0.2);
    border-left-color: var(--neon-pink);
    color: var(--neon-pink);
    text-shadow: 0 0 5px var(--neon-pink);
}

.shape-palette {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 4px;
    margin-bottom: 1rem;
}

.shape-palette h4 {
    grid-column: span 4;
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
    text-align: center;
}

.preset-palette {
    grid-template-columns: repeat(2, 1fr);
}

.preset-palette h4 {
    grid-column: span 2;
}

.preset-btn {
    min-height: 52px;
    padding: 0.45rem;
    font-size: 0.72rem;
    line-height: 1.2;
}

.kit-details {
    margin-top: 1.1rem;
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
}

.kit-details h4 {
    color: var(--neon-yellow);
    font-size: 0.78rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 0.15rem;
}

.kit-card {
    border: 1px solid rgba(0, 240, 255, 0.22);
    background: rgba(3, 7, 18, 0.82);
    box-shadow: inset 0 0 18px rgba(0, 240, 255, 0.05);
    overflow: hidden;
}

.kit-card[open] {
    border-color: rgba(0, 240, 255, 0.55);
    box-shadow: inset 0 0 18px rgba(0, 240, 255, 0.08), 0 0 12px rgba(0, 240, 255, 0.12);
}

.kit-card summary {
    list-style: none;
    cursor: pointer;
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 0.5rem;
    align-items: center;
    padding: 0.7rem 0.85rem;
    color: var(--text-main);
    user-select: none;
}

.kit-card summary::-webkit-details-marker {
    display: none;
}

.kit-card summary::after {
    content: "+";
    color: var(--neon-blue);
    font-family: var(--font-display);
    font-size: 1.1rem;
    line-height: 1;
    text-shadow: 0 0 8px var(--neon-blue);
}

.kit-card[open] summary::after {
    content: "-";
}

.kit-kind {
    color: var(--text-muted);
    font-size: 0.67rem;
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

.kit-name {
    color: var(--neon-blue);
    font-family: var(--font-display);
    font-size: 0.86rem;
    letter-spacing: 1px;
    text-align: right;
    text-shadow: 0 0 8px rgba(0, 240, 255, 0.45);
}

.kit-card:nth-of-type(2) .kit-name,
.kit-card:nth-of-type(2) summary::after {
    color: var(--neon-pink);
    text-shadow: 0 0 8px rgba(255, 0, 60, 0.45);
}

.kit-card:nth-of-type(3) .kit-name,
.kit-card:nth-of-type(3) summary::after {
    color: var(--neon-yellow);
    text-shadow: 0 0 8px rgba(252, 238, 10, 0.45);
}

.kit-card p {
    margin: 0;
    padding: 0 0.85rem 0.85rem;
    color: var(--text-muted);
    font-size: 0.78rem;
    line-height: 1.45;
}

.room-browser {
    border: 1px solid rgba(252, 238, 10, 0.3);
    background: rgba(3, 7, 18, 0.84);
    box-shadow: inset 0 0 18px rgba(252, 238, 10, 0.05);
    margin-bottom: 0.75rem;
    padding: 0.65rem;
}

.room-browser.hidden {
    display: none;
}

.room-code-panel {
    border: 1px solid rgba(252, 238, 10, 0.42);
    background: rgba(3, 7, 18, 0.9);
    box-shadow: inset 0 0 18px rgba(252, 238, 10, 0.06), 0 0 18px rgba(252, 238, 10, 0.08);
    margin-bottom: 0.75rem;
    padding: 0.65rem;
}

.room-code-panel.hidden {
    display: none;
}

.room-code-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.6rem;
    color: var(--neon-yellow);
    font-size: 0.72rem;
    letter-spacing: 1.4px;
    text-transform: uppercase;
    margin-bottom: 0.55rem;
}

.room-code-actions {
    display: flex;
    gap: 0.35rem;
}

.room-code-actions button,
.room-card-copy {
    border: 1px solid rgba(252, 238, 10, 0.65);
    background: rgba(252, 238, 10, 0.08);
    color: var(--neon-yellow);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.62rem;
    letter-spacing: 1px;
    padding: 0.32rem 0.45rem;
}

.room-code-actions button:hover,
.room-card-copy:hover {
    background: rgba(252, 238, 10, 0.18);
    box-shadow: var(--neon-glow-yellow);
}

.room-code-value {
    display: block;
    width: 100%;
    border: 1px solid rgba(0, 240, 255, 0.32);
    background: rgba(0, 240, 255, 0.08);
    color: var(--text-main);
    cursor: pointer;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 900;
    letter-spacing: 1.2px;
    line-height: 1.25;
    overflow-wrap: anywhere;
    padding: 0.6rem;
    text-align: center;
}

.room-code-qr {
    display: block;
    width: min(150px, 72%);
    aspect-ratio: 1;
    object-fit: contain;
    margin: 0.65rem auto 0;
    border: 1px solid rgba(255, 255, 255, 0.28);
    background: #ffffff;
    image-rendering: pixelated;
}

.room-code-qr.hidden {
    display: none;
}

.room-code-note {
    color: var(--text-muted);
    font-size: 0.68rem;
    letter-spacing: 0.8px;
    line-height: 1.35;
    margin: 0.5rem 0 0;
    text-align: center;
    text-transform: uppercase;
}

.room-browser-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.6rem;
    color: var(--neon-yellow);
    font-size: 0.72rem;
    letter-spacing: 1.4px;
    text-transform: uppercase;
    margin-bottom: 0.55rem;
}

.room-browser-head button,
.room-enter-btn {
    border: 1px solid rgba(252, 238, 10, 0.65);
    background: rgba(252, 238, 10, 0.08);
    color: var(--neon-yellow);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.68rem;
    letter-spacing: 1px;
    padding: 0.35rem 0.5rem;
}

.room-browser-head button:hover,
.room-enter-btn:hover {
    background: rgba(252, 238, 10, 0.18);
    box-shadow: var(--neon-glow-yellow);
}

.room-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 190px;
    overflow-y: auto;
}

.room-card {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.45rem;
    align-items: center;
    border: 1px solid rgba(0, 240, 255, 0.22);
    background: rgba(0, 240, 255, 0.05);
    padding: 0.55rem;
}

.room-card-actions {
    display: flex;
    gap: 0.35rem;
}

.room-title {
    color: var(--text-main);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.8px;
}

.room-meta {
    color: var(--text-muted);
    font-size: 0.68rem;
    line-height: 1.35;
}

.room-empty {
    color: var(--text-muted);
    font-size: 0.72rem;
    line-height: 1.35;
}

.shape-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(0, 240, 255, 0.3);
    color: var(--text-main);
    font-size: 0.7rem;
    padding: 0.5rem 0;
    cursor: pointer;
    text-align: center;
    transition: all 0.2s ease;
}

.shape-btn:hover {
    background: rgba(0, 240, 255, 0.2);
    border-color: var(--neon-blue);
}

.shape-btn.active {
    background: rgba(255, 0, 60, 0.25);
    border-color: var(--neon-pink);
    color: var(--neon-pink);
    box-shadow: var(--neon-glow-pink);
    animation: pulse-pink 2s infinite;
}

@keyframes pulse-pink {
    0% { box-shadow: 0 0 5px rgba(255, 0, 60, 0.4); }
    50% { box-shadow: 0 0 20px rgba(255, 0, 60, 0.8); }
    100% { box-shadow: 0 0 5px rgba(255, 0, 60, 0.4); }
}

hr {
    border: none;
    border-top: 1px solid rgba(255,255,255,0.1);
    margin: 1rem 0;
}

/* Center Canvas */
.canvas-container {
    flex: 1;
    position: relative;
    background: radial-gradient(circle at center, #0f172a 0%, #020617 100%);
    overflow: hidden;
    min-height: 0;
}

.grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

#select-preview-canvas {
    width: 100%;
    height: 100%;
    display: block;
    image-rendering: pixelated;
}

.builder-help {
    margin-bottom: 1rem;
    padding: 0.85rem 0.9rem;
    border: 1px solid rgba(252, 238, 10, 0.3);
    background: rgba(0, 0, 0, 0.3);
}

.builder-help h4 {
    color: var(--neon-yellow);
    font-size: 0.85rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 0.45rem;
}

.builder-help p {
    color: var(--text-main);
    font-size: 0.8rem;
    line-height: 1.45;
    margin-bottom: 0.6rem;
}

.builder-help ul {
    padding-left: 1rem;
    color: var(--text-muted);
    font-size: 0.78rem;
    line-height: 1.45;
}

.builder-help li + li {
    margin-top: 0.3rem;
}

.preview-copy {
    position: absolute;
    left: 24px;
    right: 24px;
    bottom: 24px;
    z-index: 2;
    padding: 1rem 1.1rem;
    background: rgba(5, 5, 10, 0.72);
    border: 1px solid rgba(0, 240, 255, 0.2);
    box-shadow: 0 0 18px rgba(0, 240, 255, 0.08);
    backdrop-filter: blur(12px);
    border-left: 4px solid var(--neon-yellow);
}

.scanning-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    color: var(--neon-blue);
    font-family: 'Courier New', monospace;
    font-size: 2rem;
    font-weight: bold;
    text-shadow: var(--neon-glow-blue);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 100;
}

.scanning-active .scanning-overlay {
    opacity: 1;
    animation: glitch-text 0.1s infinite;
}

@keyframes glitch-text {
    0% { transform: translate(-50%, -50%) skew(0deg); }
    20% { transform: translate(-51%, -49%) skew(1deg); }
    40% { transform: translate(-49%, -51%) skew(-1deg); }
    60% { transform: translate(-50%, -50%) skew(0deg); }
    80% { transform: translate(-51%, -51%) skew(2deg); }
    100% { transform: translate(-49%, -49%) skew(-2deg); }
}

.preview-copy h2 {
    color: var(--neon-yellow);
    font-size: 1.1rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 0.4rem;
}

.preview-copy p {
    color: var(--text-main);
    font-size: 0.88rem;
    line-height: 1.5;
    max-width: 46ch;
}

.tutorial-panel {
    position: absolute;
    top: 18px;
    left: 18px;
    max-width: 420px;
    padding: 0.9rem 1rem;
    border: 1px solid rgba(252, 238, 10, 0.45);
    background: rgba(5, 5, 10, 0.82);
    box-shadow: 0 0 16px rgba(252, 238, 10, 0.14);
    z-index: 20;
    pointer-events: none;
}

.tutorial-panel.hidden {
    display: none;
}

.tutorial-panel h3 {
    color: var(--neon-yellow);
    font-size: 0.95rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 0.45rem;
}

.tutorial-panel p {
    color: var(--text-main);
    font-size: 0.82rem;
    line-height: 1.45;
}

.tutorial-panel p + p {
    margin-top: 0.45rem;
}

/* Stats */
.stat-block {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
    background: rgba(0,0,0,0.3);
    padding: 0.5rem;
    border-radius: 4px;
}

.mt-4 { margin-top: 1.5rem; }
.mt-auto { margin-top: auto; }

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

.stat-block .value {
    font-family: 'Courier New', monospace;
    font-weight: bold;
    color: var(--neon-blue);
}

.text-warning { color: var(--neon-yellow) !important; }

/* Buttons */
.action-btn {
    padding: 1rem;
    margin-bottom: 0.5rem;
    background: transparent;
    border: 1px solid var(--neon-blue);
    color: var(--neon-blue);
    font-weight: bold;
    letter-spacing: 2px;
    cursor: pointer;
    text-transform: uppercase;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.action-btn:hover:not(:disabled) {
    background: var(--neon-blue);
    color: #000;
    box-shadow: 0 0 15px var(--neon-blue);
}

.action-btn:disabled {
    border-color: var(--text-muted);
    color: var(--text-muted);
    cursor: not-allowed;
    opacity: 0.5;
}

.battle-btn {
    border-color: var(--neon-pink);
    color: var(--neon-pink);
}

.battle-btn:hover:not(:disabled) {
    background: var(--neon-pink);
    color: #fff;
    box-shadow: 0 0 15px var(--neon-pink);
}

.exit-btn {
    border-color: var(--neon-pink);
    color: var(--neon-pink);
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    background: rgba(0, 0, 0, 0.4);
}

.exit-btn:hover {
    background: var(--neon-pink);
    color: #fff;
    box-shadow: 0 0 10px var(--neon-pink);
}

@media (max-width: 900px) {
    #game-container {
        min-height: 100dvh;
    }

    header {
        padding: 0.85rem 1rem;
    }

    header h1 {
        font-size: 1.1rem;
        letter-spacing: 1px;
    }

    .screen {
        min-height: 100dvh;
    }

    #screen-builder {
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .builder-layout {
        flex-direction: column;
        overflow: visible;
    }

    aside,
    aside.stats-panel {
        width: 100%;
        border-left: none;
        border-right: none;
    }

    aside {
        padding: 1rem;
    }

    .parts-panel {
        order: 1;
    }

    .canvas-container {
        order: 2;
        flex: none;
        min-height: 52vh;
    }

    .stats-panel {
        order: 3;
    }

    .shape-palette {
        grid-template-columns: repeat(3, 1fr);
    }

    .shape-palette h4 {
        grid-column: span 3;
    }

    .preview-copy {
        position: static;
        margin: 1rem;
    }

    #mobile-controls {
        padding: 0 14px !important;
        bottom: 14px !important;
        gap: 12px;
    }

    #mobile-controls .action-pad {
        width: auto !important;
        max-width: 320px;
    }

    #mobile-controls .d-pad,
    #mobile-controls .action-pad {
        gap: 8px !important;
    }

    .tutorial-panel {
        top: 12px;
        left: 12px;
        right: 12px;
        max-width: none;
    }
}

/* Utils */
.text-glitch {
    position: relative;
}