:root {
    --grid-size: 8;
    --cell-size: min(10vw, 10vh, 65px);
    --mini-cell-size: 12px;

    /* Theme colors - these are overridden by ThemeManager */
    --neon-cyan: #00f3ff;
    --neon-green: #00ff9f;
    --neon-amber: #ffaa00;
    --neon-magenta: #ff00ff;
    --neon-red: #ff3366;
    --neon-blue: #5577ff;

    --dim-trace: #444444;
    --bg-black: #050506;
    --wall-round: 2px;

    /* Layer-specific colors (set by theme) */
    --layer-0-color: var(--neon-cyan);
    --layer-1-color: var(--neon-blue);
    --layer-2-color: var(--neon-amber);
    --layer-3-color: var(--neon-magenta);

    /* iOS Safe Areas */
    --safe-area-top: env(safe-area-inset-top, 0px);
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
    --safe-area-left: env(safe-area-inset-left, 0px);
    --safe-area-right: env(safe-area-inset-right, 0px);
}

html, body {
    width: 100%; height: 100%; margin: 0; padding: 0; overflow-x: hidden;
    position: fixed; overscroll-behavior-y: contain;
    touch-action: manipulation;
    user-select: none; -webkit-user-select: none;
    /* Prevent pull-to-refresh on iOS */
    overscroll-behavior: none;
    font-family: monospace;
}

body {
    background-color: var(--bg-black);
    color: #fff; font-family: monospace;
    display: flex; flex-direction: column; align-items: center; overflow-y: auto;
    /* Account for iOS safe areas */
    padding-top: var(--safe-area-top);
    padding-bottom: var(--safe-area-bottom);
    padding-left: var(--safe-area-left);
    padding-right: var(--safe-area-right);
}

.header-strip {
    width: 100%; background: #0f0f14; border-bottom: 2px solid rgba(0, 243, 255, 0.4);
    padding: 8px 12px; display: flex; justify-content: center; align-items: center; flex-wrap: wrap; gap: 8px;
    position: sticky; top: 0; z-index: 100;
}
.btn-group-nowrap {
    display: flex; align-items: center; gap: 8px; flex-wrap: nowrap;
}

.cyber-btn {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--btn-default-color, var(--neon-cyan));
    color: var(--btn-default-color, var(--neon-cyan));
    padding: 4px 10px; font-size: 10px; font-weight: 900;
    text-transform: uppercase; letter-spacing: 1px; transition: 0.2s; border-radius: 2px;
    touch-action: manipulation;
    font-family: monospace;
}
.cyber-btn:hover:not(:disabled) {
    background: var(--btn-default-color, var(--neon-cyan));
    color: #000;
    box-shadow: 0 0 15px var(--btn-default-color, var(--neon-cyan));
}
.btn-action {
    border-color: var(--btn-action-color, var(--neon-green));
    color: var(--btn-action-color, var(--neon-green));
}
.btn-action:hover:not(:disabled) {
    background: var(--btn-action-color, var(--neon-green));
}
.btn-kill {
    border-color: var(--btn-danger-color, var(--neon-red));
    color: var(--btn-danger-color, var(--neon-red));
}
.btn-kill:hover:not(:disabled) {
    background: var(--btn-danger-color, var(--neon-red));
}
.btn-amber {
    border-color: var(--btn-info-color, var(--neon-amber));
    color: var(--btn-info-color, var(--neon-amber));
}
.btn-amber:hover:not(:disabled) {
    background: var(--btn-info-color, var(--neon-amber));
    color: #000;
    box-shadow: 0 0 15px var(--btn-info-color, var(--neon-amber));
}
.btn-sound {
    border-color: var(--btn-sound-color, var(--neon-magenta));
    color: var(--btn-sound-color, var(--neon-magenta));
    padding: 4px 8px; font-size: 14px; min-width: 36px;
}
.btn-menu {
    font-size: 16px; padding: 4px 10px;
}
.btn-hint {
    border-color: var(--btn-hint-color, var(--neon-yellow, #ffcc00));
    color: var(--btn-hint-color, var(--neon-yellow, #ffcc00));
    font-size: 14px; font-weight: bold; padding: 3px 10px; min-width: 32px;
}
.btn-hint:hover:not(:disabled) {
    background: var(--btn-hint-color, var(--neon-yellow, #ffcc00));
    color: #000;
    box-shadow: 0 0 15px var(--btn-hint-color, var(--neon-yellow, #ffcc00));
}

/* Separator between hint button and fork buttons */
#hintBtn {
    margin-right: 4px;
    position: relative;
}
#hintBtn::after {
    content: '';
    position: absolute;
    right: -8px;
    top: 15%;
    height: 70%;
    width: 1px;
    background: linear-gradient(to bottom, transparent, rgba(255, 255, 255, 0.3), transparent);
}

/* Slide-in Menu */
.menu-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.6); z-index: 1000;
    opacity: 0; visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}
.menu-overlay.visible {
    opacity: 1; visibility: visible;
}

.slide-menu {
    position: fixed; top: 0; left: 0; width: 360px; height: 100%;
    background: rgba(10, 10, 15, 0.98);
    border-right: 2px solid var(--neon-cyan);
    box-shadow: 0 0 30px rgba(0, 243, 255, 0.3);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    display: flex; flex-direction: column;
}
.menu-overlay.visible .slide-menu {
    transform: translateX(0);
}

.menu-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid rgba(0, 243, 255, 0.3);
}
.menu-title {
    color: var(--neon-cyan); font-size: 14px; font-weight: bold;
    letter-spacing: 2px;
    font-family: monospace;
}
.menu-close-btn {
    background: none; border: none; color: var(--neon-cyan);
    font-size: 18px; cursor: pointer; padding: 4px 8px;
    transition: color 0.2s, text-shadow 0.2s;
    font-family: monospace;
}
.menu-close-btn:hover {
    color: #fff; text-shadow: 0 0 10px var(--neon-cyan);
}

.menu-items {
    flex: 1; padding: 12px 0; overflow-y: auto;
}
.menu-item {
    display: flex; align-items: center; gap: 12px;
    width: 100%; padding: 14px 20px;
    background: none; border: none;
    color: #ccc; font-size: 13px;
    text-align: left; cursor: pointer;
    transition: background 0.2s, color 0.2s;
    font-family: monospace;
}
.menu-item:hover {
    background: rgba(0, 243, 255, 0.1);
    color: var(--neon-cyan);
}
.menu-item-icon {
    font-size: 18px; width: 24px; text-align: center;
}
.menu-item-label {
    flex: 1;
}
.menu-item.muted .menu-item-icon,
.menu-item.muted .menu-item-label {
    opacity: 0.5;
}
.menu-toggle {
    justify-content: space-between;
}
.menu-toggle-state {
    font-size: 11px; font-weight: bold;
    padding: 2px 8px; border-radius: 3px;
    background: rgba(0, 255, 100, 0.2);
    color: var(--neon-green);
    border: 1px solid var(--neon-green);
    font-family: monospace;
}
.menu-toggle.off .menu-toggle-state,
.menu-toggle-state.off-state {
    background: rgba(255, 255, 255, 0.1);
    color: #666;
    border-color: #666;
}

/* Expandable menu sections */
.menu-expand-section {
    display: flex;
    flex-direction: column;
}
.menu-expand-section.nested {
    margin-left: 0;
}
.menu-expand-header {
    display: flex;
    align-items: center;
    gap: 8px;
}
.menu-expand-header .menu-item-label {
    flex: 1;
}
.menu-expand-icon {
    font-size: 10px;
    transition: transform 0.2s ease;
    color: var(--neon-cyan);
    width: 12px;
}
.menu-expand-section.expanded > .menu-expand-header .menu-expand-icon {
    transform: rotate(90deg);
}
.menu-expand-content {
    display: none;
    flex-direction: column;
    padding-left: 20px;
    border-left: 1px solid rgba(0, 243, 255, 0.2);
    margin-left: 26px;
}
.menu-expand-section.expanded > .menu-expand-content {
    display: flex;
}
.nested-item {
    padding-left: 12px;
    font-size: 13px;
}
.nested-item .menu-item-label {
    opacity: 0.9;
}

.menu-item-danger {
    color: #ff6b6b;
}
.menu-item-danger:hover {
    background: rgba(255, 107, 107, 0.15);
    color: #ff4444;
}

.menu-divider {
    height: 1px; margin: 8px 20px;
    background: rgba(0, 243, 255, 0.2);
}
.menu-footer {
    margin-top: auto;
    padding-bottom: 16px;
}

/* Seed Section */
.seed-section {
    padding: 12px 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.seed-current {
    display: flex;
    align-items: center;
    gap: 8px;
}
.seed-label {
    color: #888;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.seed-value {
    font-family: 'Courier New', monospace;
    color: var(--neon-cyan);
    font-size: 14px;
    letter-spacing: 1px;
}
.seed-copy-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 14px;
    padding: 2px 6px;
    opacity: 0.6;
    transition: opacity 0.2s;
}
.seed-copy-btn:hover {
    opacity: 1;
}
.seed-history {
    display: flex;
    align-items: flex-start;
    gap: 8px;
}
.seed-history-list {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}
.seed-history-item {
    font-family: 'Courier New', monospace;
    font-size: 11px;
    color: #666;
    cursor: pointer;
    padding: 2px 6px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 3px;
    transition: all 0.2s;
}
.seed-history-item:hover {
    color: var(--neon-cyan);
    background: rgba(0, 243, 255, 0.1);
}
.seed-input-row {
    display: flex;
    gap: 8px;
    margin-top: 4px;
}
.seed-input {
    flex: 1;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid #444;
    color: var(--neon-cyan);
    font-family: 'Courier New', monospace;
    font-size: 13px;
    padding: 6px 10px;
    border-radius: 4px;
    outline: none;
    transition: border-color 0.2s;
}
.seed-input:focus {
    border-color: var(--neon-cyan);
}
.seed-input::placeholder {
    color: #555;
}
.seed-play-btn {
    background: rgba(0, 243, 255, 0.1);
    border: 1px solid var(--neon-cyan);
    color: var(--neon-cyan);
    font-size: 12px;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.2s;
}
.seed-play-btn:hover {
    background: var(--neon-cyan);
    color: #000;
}

.menu-audio-row {
    display: flex; justify-content: center; gap: 16px;
    padding: 12px 20px;
}
.menu-audio-btn {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--neon-magenta);
    color: var(--neon-magenta);
    width: 48px; height: 48px;
    font-size: 20px; cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s;
    display: flex; align-items: center; justify-content: center;
    font-family: monospace;
}
.menu-audio-btn:hover {
    background: var(--neon-magenta);
    color: #000;
    box-shadow: 0 0 15px var(--neon-magenta);
}
.menu-audio-btn.muted {
    opacity: 0.5;
    border-color: #666;
    color: #666;
}
.menu-audio-btn.muted:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #888;
    box-shadow: none;
}
.menu-version {
    text-align: center;
    font-family: var(--font-mono, 'Courier New', monospace);
    font-size: 10px;
    color: rgba(100, 100, 100, 0.6);
    padding: 8px 0 0 0;
    letter-spacing: 1px;
}
.btn-sound:hover:not(:disabled) {
    background: var(--btn-sound-color, var(--neon-magenta));
    color: #000;
    box-shadow: 0 0 15px var(--btn-sound-color, var(--neon-magenta));
}
.btn-sound.muted { border-color: #666; color: #666; opacity: 0.6; }
.btn-sound.muted:hover { background: #333; color: #999; box-shadow: none; }
.cyber-btn:disabled, .cyber-btn.btn-action:disabled, .cyber-btn.btn-kill:disabled {
    opacity: 0.35; cursor: not-allowed; border-color: #444 !important; color: #666 !important; background: transparent !important; box-shadow: none !important;
}

.size-select, .theme-select {
    background: #000; color: var(--btn-default-color, var(--neon-cyan));
    border: 1px solid var(--btn-default-color, var(--neon-cyan));
    font-size: 12px; padding: 2.5px 8px; border-radius: 2px;
    touch-action: manipulation;
    font-family: monospace;
}

/* Mode selection strip */
.mode-strip {
    display: flex; align-items: center; justify-content: center; gap: 8px;
    flex-wrap: wrap;
    padding: 6px 10px; background: rgba(0, 0, 0, 0.6);
    border-bottom: 1px solid rgba(0, 243, 255, 0.2);
}
.mode-btn {
    display: flex; align-items: center; gap: 5px;
    padding: 5px 10px; background: transparent;
    border: 1px solid #444; border-radius: 3px;
    color: #888; font-size: 10px; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.5px;
    cursor: pointer; transition: all 0.15s;
    touch-action: manipulation;
    font-family: monospace;
}
.mode-btn:hover { border-color: #666; color: #aaa; }
.mode-btn.active {
    border-color: var(--neon-cyan); color: var(--neon-cyan);
    box-shadow: 0 0 8px rgba(0, 243, 255, 0.3);
}
.mode-btn[data-mode="wall"].active { border-color: var(--neon-cyan); color: var(--neon-cyan); box-shadow: 0 0 8px rgba(0, 243, 255, 0.3); }
.mode-btn[data-mode="path"].active { border-color: #fff; color: #fff; box-shadow: 0 0 8px rgba(255, 255, 255, 0.3); }
.mode-btn[data-mode="erase"].active { border-color: var(--neon-red); color: var(--neon-red); box-shadow: 0 0 8px rgba(255, 51, 102, 0.3); }
.mode-btn[data-mode="smart"].active { border-color: var(--neon-green); color: var(--neon-green); box-shadow: 0 0 8px rgba(0, 255, 159, 0.3); }
.mode-btn[data-mode="hint"].active { border-color: var(--neon-yellow); color: var(--neon-yellow); box-shadow: 0 0 8px rgba(255, 204, 0, 0.3); }

/* Mode button icons */
.mode-icon {
    display: inline-flex; align-items: center; justify-content: center;
    width: 14px; height: 14px; position: relative;
}
.mode-icon-wall {
    background: var(--neon-cyan); box-shadow: 0 0 4px var(--neon-cyan);
}
.mode-icon-path::after {
    content: ''; width: 8px; height: 8px; background: white; border-radius: 50%;
    box-shadow: 0 0 4px white;
}
.mode-icon-erase {
    font-size: 12px; font-weight: bold;
}
.mode-icon-erase::after {
    content: '✕'; color: var(--neon-red);
}
.mode-icon-smart {
    font-size: 10px;
}
.mode-icon-smart::after {
    content: '⚡'; color: var(--neon-green);
}
.mode-icon-hint {
    font-size: 12px; font-weight: bold;
}
.mode-icon-hint::after {
    content: '?'; color: var(--neon-yellow);
}

.grid-wrapper {
    margin-top: 10px; display: inline-grid; grid-template-columns: auto auto auto; grid-template-rows: auto auto;
    max-width: 98vw; padding: 10px; box-sizing: border-box; justify-content: center;
    touch-action: none;
}
.grid-spacer {
    width: var(--cell-size);
}

.cyber-grid {
    display: grid; gap: 1px; background: rgba(0, 243, 255, 0.2);
    border: 2px solid rgba(0, 243, 255, 0.9); position: relative;
}

.cell {
    width: var(--cell-size); height: var(--cell-size); background: var(--bg-black);
    position: relative; display: flex; align-items: center; justify-content: center;
    cursor: pointer; z-index: 5; touch-action: none;
}

.cell-row-ok::before {
    content: ''; position: absolute; inset: 0; pointer-events: none; z-index: 1;
    background: rgba(0, 255, 159, 1);
    opacity: 0.02;
    animation: pulse-cell var(--pulse-duration, 4s) ease-in-out infinite;
    animation-delay: var(--row-delay, 0s);
}

.cell-col-ok::after {
    content: ''; position: absolute; inset: 0; pointer-events: none; z-index: 1;
    background: rgba(0, 255, 159, 1);
    opacity: 0.02;
    animation: pulse-cell var(--pulse-duration, 4s) ease-in-out infinite;
    animation-delay: var(--col-delay, 0s);
}

@keyframes pulse-cell {
    0% { opacity: 0.02; }
    25% { opacity: 0.04; }
    50% { opacity: 0.02; }
    100% { opacity: 0.02; }
}

/* Fork Anchor - Diamond Marker */
.fork-anchor {
    position: absolute; width: 45%; height: 45%;
    border: 2px solid var(--neon-cyan);
    outline: 1.5px solid #000;
    transform: rotate(45deg);
    z-index: 150;
    pointer-events: none;
    box-shadow: 0 0 10px var(--neon-cyan), inset 0 0 5px rgba(0,0,0,0.8);
    animation: anchor-pulse 1.5s ease-in-out infinite;
    animation-delay: var(--anim-delay, 0ms);
}

/* Erratic cell state */
.cell-erratic { background: radial-gradient(circle, rgba(255, 0, 255, 0.15) 0%, transparent 70%); animation: cell-jitter 4s infinite; }

/* Neural Trace Lines */
.trace-line { position: absolute; background: #fff; z-index: 20; pointer-events: none; opacity: 0.4; transition: 0.2s; }
.trace-v { width: 2px; left: calc(50% - 1px); height: 100%; }
.trace-h { height: 2px; top: calc(50% - 1px); width: 100%; }
.trace-n { top: 0; height: 50%; } .trace-s { bottom: 0; height: 50%; } .trace-e { right: 0; width: 50%; } .trace-w { left: 0; width: 50%; }

.trace-complete { background: var(--neon-green) !important; opacity: 0.8; box-shadow: 0 0 8px var(--neon-green); }
.trace-complete.trace-dim { opacity: 0.3; box-shadow: none; }
.trace-complete-blue { background: var(--neon-blue) !important; opacity: 0.8; box-shadow: 0 0 8px var(--neon-blue); }
.trace-complete-blue.trace-dim { opacity: 0.3; box-shadow: none; }
.trace-error { background: var(--neon-red) !important; box-shadow: 0 0 8px var(--neon-red) !important; opacity: 1; }
.trace-erratic { background: var(--neon-magenta) !important; box-shadow: 0 0 8px var(--neon-magenta) !important; opacity: 0.6; }

/* Path Markers */
.path-dot { width: 22%; height: 22%; background: white; border-radius: 50%; box-shadow: 0 0 8px white; z-index: 25; pointer-events: none; }
.path-dot-dim { background: #444 !important; box-shadow: none !important; }
.path-dot-complete { background: var(--neon-green) !important; box-shadow: 0 0 10px var(--neon-green) !important; }
.path-dot-complete.path-dot-dim { opacity: 0.4; box-shadow: none !important; }
.path-dot-complete-blue { background: var(--neon-blue) !important; box-shadow: 0 0 10px var(--neon-blue) !important; }
.path-dot-complete-blue.path-dot-dim { opacity: 0.4; box-shadow: none !important; }
.path-dot-error { background: var(--neon-red) !important; box-shadow: 0 0 15px var(--neon-red) !important; animation: jitter-fast 0.1s infinite !important; animation-delay: var(--anim-delay, 0ms) !important; }
.path-dot-erratic { background: var(--neon-magenta) !important; box-shadow: 0 0 15px var(--neon-magenta) !important; animation: jitter-fast 0.15s infinite !important; animation-delay: var(--anim-delay, 0ms) !important; }

/* Dead End Nodes */
.node {
    position: absolute; inset: 0; margin: auto; width: 44%; height: 44%; z-index: 50; background: #000;
    border: 2px solid var(--neon-cyan); border-radius: 2px; box-shadow: 0 0 8px var(--neon-cyan);
    box-sizing: border-box;
    display: flex; align-items: center; justify-content: center; pointer-events: none;
}
.node-core {
    position: absolute; inset: 0; margin: auto;
    width: 50%; height: 50%; background: var(--neon-cyan);
    animation: core-pulse 3s infinite;
    animation-delay: var(--anim-delay, 0ms);
}
.node-complete { border-color: var(--neon-green) !important; box-shadow: 0 0 12px var(--neon-green) !important; }
.node-complete .node-core { background: var(--neon-green) !important; }
.node-conflict { border-color: var(--neon-red) !important; box-shadow: 0 0 15px var(--neon-red) !important; animation: jitter-fast 0.08s infinite !important; }

/* Data Stockpile */
.stockpile {
    position: absolute; inset: 0; margin: auto; width: 60%; height: 60%; z-index: 45;
    background: linear-gradient(135deg, #1a0a2e 0%, #0a0a1a 100%);
    border: 2px solid var(--neon-amber); border-radius: 4px;
    box-shadow: 0 0 12px var(--neon-amber), inset 0 0 8px rgba(255, 170, 0, 0.3);
    display: flex; align-items: center; justify-content: center; pointer-events: none;
}
.stockpile-icon {
    width: 50%; height: 50%;
    background: var(--neon-amber);
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
    animation: stockpile-pulse 2s infinite;
    animation-delay: var(--anim-delay, 0ms);
}
@keyframes stockpile-pulse {
    0%, 100% { opacity: 0.7; transform: scale(0.9); }
    50% { opacity: 1; transform: scale(1.1); }
}
.stockpile-complete {
    border-color: var(--neon-green) !important;
    box-shadow: 0 0 12px var(--neon-green), inset 0 0 8px rgba(0, 255, 159, 0.3) !important;
}
.stockpile-complete .stockpile-icon {
    background: var(--neon-green) !important;
}
.stockpile-retrieved {
    animation: stockpile-retrieve 0.8s ease-out forwards !important;
}
.stockpile-retrieved .stockpile-icon {
    animation: stockpile-icon-retrieve 0.8s ease-out forwards !important;
}
@keyframes stockpile-retrieve {
    0% { transform: scale(1); box-shadow: 0 0 12px var(--neon-green), inset 0 0 8px rgba(0, 255, 159, 0.3); }
    30% { transform: scale(1.3); box-shadow: 0 0 30px var(--neon-green), 0 0 60px var(--neon-green), inset 0 0 15px rgba(0, 255, 159, 0.6); }
    100% { transform: scale(1.1); box-shadow: 0 0 20px var(--neon-green), 0 0 40px rgba(0, 255, 159, 0.5), inset 0 0 10px rgba(0, 255, 159, 0.4); }
}
@keyframes stockpile-icon-retrieve {
    0% { transform: scale(1); opacity: 1; }
    30% { transform: scale(1.5) rotate(180deg); opacity: 1; }
    100% { transform: scale(1.2) rotate(360deg); opacity: 1; }
}

/* Walls */
.wall { position: absolute; inset: 5%; z-index: 12; pointer-events: none; border-radius: var(--wall-round); }
.wall-l0 { background: var(--neon-cyan); box-shadow: 0 0 10px var(--neon-cyan); }
.wall-l1 { background: var(--neon-blue); box-shadow: 0 0 10px var(--neon-blue); }
.wall-l2 { background: var(--neon-amber); box-shadow: 0 0 10px var(--neon-amber); }
.wall-l3 { background: var(--neon-magenta); box-shadow: 0 0 10px var(--neon-magenta); }
.wall-locked {
    background: var(--bg-black);
    outline: 2px solid rgba(255, 255, 255, 0.6);
    box-shadow: none;
    outline-offset: -2px;
    background-image: repeating-linear-gradient(
        45deg,
        rgba(255, 255, 255, 0.25) 0px,
        rgba(255, 255, 255, 0.25) 2px,
        rgba(0, 0, 0, 0) 2px,
        rgba(0, 0, 0, 0) 4px
    );
}
.wall-error { background: var(--neon-red) !important; box-shadow: 0 0 15px var(--neon-red) !important; z-index: 15; animation-name: err-pulse; animation-duration: 1.5s; animation-timing-function: ease-in-out; animation-iteration-count: infinite; }
.wall-error-dim { background: var(--neon-red) !important; box-shadow: none !important; opacity: 0.4; }

/* Red X */
.invalid-box {
    position: absolute; inset: 8%; z-index: 100; pointer-events: none;
    display: flex; align-items: center; justify-content: center;
    border: 2px solid rgba(255, 51, 102, 0.15); border-radius: 4px;
}
.invalid-box-high {
    background: rgba(255, 51, 102, 0.25); border: 2.5px solid var(--neon-red);
    box-shadow: 0 0 20px rgba(255, 51, 102, 0.6); animation: jitter-fast 0.1s infinite;
    animation-delay: var(--anim-delay, 0ms);
}
.invalid-x { position: relative; width: 75%; height: 75%; opacity: 0.3; }
.invalid-box-high .invalid-x { opacity: 0.95; }
.invalid-x::before, .invalid-x::after {
    content: ''; position: absolute; width: 100%; height: 4px;
    background: var(--neon-red); top: 50%; left: 0; border-radius: 2px;
    box-shadow: 0 0 8px var(--neon-red);
}
.invalid-x::before { transform: rotate(45deg); }
.invalid-x::after { transform: rotate(-45deg); }

/* Labels */
.count-neon {
    width: var(--cell-size); height: var(--cell-size);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem; font-weight: 900;
    font-family: var(--font-display, 'Courier New', monospace);
    color: var(--label-default, #444); position: relative;
}
.count-ok {
    color: var(--neon-green); text-shadow: 0 0 15px var(--neon-green);
}
.label-container-row .count-ok {
    background: linear-gradient(to right, transparent 0%, rgba(0, 255, 159, 0.2) 100%);
}
.label-container-col .count-ok {
    background: linear-gradient(to bottom, transparent 0%, rgba(0, 255, 159, 0.2) 100%);
}
.count-path-ok {
    color: var(--neon-blue); text-shadow: 0 0 15px var(--neon-blue);
}
.label-container-row .count-path-ok {
    background: linear-gradient(to right, transparent 0%, rgba(85, 119, 255, 0.2) 100%);
}
.label-container-col .count-path-ok {
    background: linear-gradient(to bottom, transparent 0%, rgba(85, 119, 255, 0.2) 100%);
}
.count-over { color: var(--neon-red); text-shadow: 0 0 15px var(--neon-red); }

/* Label anchor - diamond marker on labels */
.label-anchor::after {
    content: ''; position: absolute; width: 8px; height: 8px;
    transform: rotate(45deg);
}
.label-anchor-blue::after { border: 2px solid var(--neon-blue); box-shadow: 0 0 8px var(--neon-blue); }
.label-anchor-amber::after { border: 2px solid var(--neon-amber); box-shadow: 0 0 8px var(--neon-amber); }
.label-anchor-magenta::after { border: 2px solid var(--neon-magenta); box-shadow: 0 0 8px var(--neon-magenta); }
.label-container-row .label-anchor::after { right: 4px; }
.label-container-col .label-anchor::after { bottom: 4px; }

.label-container-row { display: flex; flex-direction: column; gap: 1px; }
.label-container-col { display: flex; gap: 1px; }
.node-conflict .node-core { background: var(--neon-red) !important; }
.node-erratic { border-color: var(--neon-magenta) !important; box-shadow: 0 0 15px var(--neon-magenta) !important; animation: jitter-fast 0.12s infinite !important; }
.node-erratic .node-core { background: var(--neon-magenta) !important; animation: core-pulse-fast 0.5s infinite !important; }


/* Victory Overlay */
#victoryOverlay {
    position: absolute; inset: 0; background: rgba(0,0,0,0.85);
    z-index: 200; display: none; flex-direction: column; align-items: center; justify-content: center;
    border: 4px solid var(--neon-green); box-shadow: inset 0 0 50px var(--neon-green); pointer-events: none;
    overflow: hidden;
}
#victoryOverlay.visible { display: flex; animation: victory-fade-in 0.5s ease-out; }

.victory-content {
    position: relative; z-index: 2; text-align: center;
    animation: victory-content-in 0.6s ease-out 0.2s both;
}
.victory-title {
    font-size: 1.5rem; font-weight: 900; color: var(--neon-green);
    text-shadow: 0 0 20px var(--neon-green), 0 0 40px var(--neon-green);
    letter-spacing: 3px; margin-bottom: 20px;
    font-family: var(--font-heading, 'Courier New', monospace);
}
.victory-stats {
    font-family: var(--font-mono, 'Courier New', monospace); font-size: 12px;
    color: #aaa; text-align: left; padding: 15px 20px;
    background: rgba(0, 255, 159, 0.05); border: 1px solid rgba(0, 255, 159, 0.3);
    margin-top: 10px;
}
.stat-row { display: flex; justify-content: space-between; margin: 8px 0; }
.stat-label { color: var(--neon-cyan); text-transform: uppercase; letter-spacing: 1px; }
.stat-value { color: var(--neon-green); font-weight: bold; }
.stat-value.highlight { color: var(--neon-amber); text-shadow: 0 0 10px var(--neon-amber); }

.techno-babble {
    font-family: var(--font-mono, 'Courier New', monospace); font-size: 10px; color: #999;
    margin: 8px 0 12px 0; letter-spacing: 1px; text-transform: uppercase;
}

.next-level-btn {
    margin-top: 16px; padding: 10px 24px; font-size: 12px;
    pointer-events: auto; cursor: pointer;
}

/* Stats Overlay */
.stats-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,0.9);
    z-index: 300; display: none; align-items: center; justify-content: center;
}
.stats-overlay.visible { display: flex; animation: victory-fade-in 0.3s ease-out; }

.stats-modal {
    background: rgba(5, 5, 6, 0.95);
    border: 2px solid var(--neon-cyan);
    box-shadow: 0 0 30px rgba(0, 243, 255, 0.3), inset 0 0 20px rgba(0, 243, 255, 0.1);
    padding: 24px 32px;
    max-width: 400px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
}

.stats-title {
    font-size: 1.3rem; font-weight: 900; color: var(--neon-cyan);
    text-shadow: 0 0 20px var(--neon-cyan);
    letter-spacing: 3px; margin-bottom: 20px; text-align: center;
    font-family: var(--font-heading, 'Courier New', monospace);
}

.stats-content {
    font-family: var(--font-mono, 'Courier New', monospace); font-size: 12px;
    color: #aaa; text-align: left; padding: 15px 20px;
    background: rgba(0, 243, 255, 0.05); border: 1px solid rgba(0, 243, 255, 0.3);
}

.stats-section-title {
    color: var(--neon-amber); font-size: 11px; text-transform: uppercase;
    letter-spacing: 2px; margin-top: 16px; margin-bottom: 8px;
    border-bottom: 1px solid rgba(255, 170, 0, 0.3); padding-bottom: 4px;
}

.stats-size-tabs {
    display: flex; gap: 4px; margin-top: 8px;
}

.stats-tab {
    flex: 1; padding: 6px 4px; font-size: 10px;
    font-family: var(--font-mono, 'Courier New', monospace);
    background: rgba(0, 243, 255, 0.05);
    border: 1px solid rgba(0, 243, 255, 0.2);
    color: #888; cursor: pointer;
    transition: all 0.2s ease;
}

.stats-tab:hover {
    background: rgba(0, 243, 255, 0.1);
    color: var(--neon-cyan);
}

.stats-tab.active {
    background: rgba(0, 243, 255, 0.15);
    border-color: var(--neon-cyan);
    color: var(--neon-cyan);
    text-shadow: 0 0 8px var(--neon-cyan);
}

.stats-tab.locked {
    opacity: 0.4;
    cursor: not-allowed;
    color: #555;
}

.stats-tab.locked:hover {
    background: rgba(0, 243, 255, 0.05);
    color: #555;
}

.stats-size-content {
    margin-top: 8px; padding: 12px;
    background: rgba(0, 243, 255, 0.05);
    border: 1px solid rgba(0, 243, 255, 0.2);
}

.stats-size-content .stat-row {
    margin: 6px 0;
}

.stats-buttons {
    display: flex; gap: 12px; justify-content: center; margin-top: 20px;
}

.stats-buttons .cyber-btn {
    padding: 8px 20px; font-size: 11px;
}

/* Confirm Dialog */
.confirm-dialog {
    background: rgba(5, 5, 6, 0.98);
    border: 2px solid var(--neon-red);
    box-shadow: 0 0 30px rgba(255, 0, 64, 0.4);
    padding: 0; max-width: 350px;
}

.confirm-dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    box-sizing: border-box;
    margin: 0;
    max-width: min(350px, calc(100vw - 16px));
    max-height: calc(100vh - 16px);
    width: calc(100vw - 16px);
    overflow: auto;
}

.confirm-dialog::backdrop {
    background: rgba(0, 0, 0, 0.8);
}

.confirm-dialog-content {
    padding: 24px;
}

.confirm-dialog-title {
    font-size: 1.1rem; font-weight: 900; color: var(--neon-red);
    text-shadow: 0 0 15px var(--neon-red);
    letter-spacing: 2px; margin-bottom: 16px; text-align: center;
    font-family: var(--font-heading, 'Courier New', monospace);
}

.confirm-dialog-message {
    font-family: var(--font-mono, 'Courier New', monospace);
    font-size: 12px; color: #aaa; text-align: center;
    margin-bottom: 20px;
}

.confirm-dialog-buttons {
    display: flex; gap: 12px; justify-content: center;
}

.confirm-dialog-buttons .cyber-btn {
    padding: 8px 20px; font-size: 11px;
}

/* Tutorial Dialog */
.tutorial-dialog {
    background: rgba(5, 5, 6, 0.98);
    border: 2px solid var(--neon-cyan);
    box-shadow: 0 0 30px rgba(0, 243, 255, 0.4);
    padding: 0; max-width: 400px; border-radius: 4px;
}

.tutorial-dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    box-sizing: border-box;
    margin: 0;
    max-width: min(400px, calc(100vw - 16px));
    max-height: calc(100vh - 16px);
    width: calc(100vw - 16px);
    overflow: auto;
}

.tutorial-dialog::backdrop {
    background: rgba(0, 0, 0, 0.85);
}

.tutorial-dialog.tutorial-complete {
    border-color: var(--neon-green);
    box-shadow: 0 0 30px rgba(0, 255, 159, 0.4);
}

.tutorial-dialog-content {
    padding: 24px;
}

.tutorial-dialog-title {
    font-size: 1.1rem; font-weight: 900; color: var(--neon-cyan);
    text-shadow: 0 0 15px var(--neon-cyan);
    letter-spacing: 2px; margin-bottom: 16px; text-align: center;
    font-family: var(--font-heading, 'Courier New', monospace);
}

.tutorial-complete .tutorial-dialog-title {
    color: var(--neon-green);
    text-shadow: 0 0 15px var(--neon-green);
}

.tutorial-dialog-body {
    font-family: var(--font-mono, 'Courier New', monospace);
    font-size: 12px; color: #bbb; line-height: 1.6;
}

.tutorial-dialog-body p {
    margin: 10px 0;
}

.tutorial-rules {
    background: rgba(0, 243, 255, 0.05);
    border-left: 2px solid var(--neon-cyan);
    padding: 10px 14px; margin: 14px 0;
}

.tutorial-rules p {
    margin: 6px 0;
}

.tutorial-highlight {
    color: var(--neon-cyan); font-weight: bold;
}

.tutorial-complete .tutorial-highlight {
    color: var(--neon-green);
}

.tutorial-instruction {
    color: var(--neon-amber); font-style: italic; margin-top: 14px !important;
}

.tutorial-success {
    color: var(--neon-green); font-size: 14px; font-weight: bold;
    text-align: center; margin-bottom: 14px !important;
}

.tutorial-techno {
    color: #888; font-size: 11px; text-align: center;
}

.tutorial-next {
    color: #aaa; margin-top: 14px !important;
}

.tutorial-dialog-buttons {
    display: flex; gap: 12px; justify-content: center; margin-top: 20px;
}

.tutorial-dialog-buttons .cyber-btn {
    padding: 10px 24px; font-size: 11px;
}

/* Auto tool explanation dialog */
.auto-tool-example {
    margin: 12px 0;
    padding: 8px 0;
}

.auto-tool-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 8px 0;
    flex-wrap: wrap;
}

.auto-tool-diagram p {
    margin: 4px 0;
    text-align: center;
    font-size: 11px;
    color: #aaa;
}

.auto-tool-sections {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

@media (min-width: 800px) {
    #autoToolDialog {
        max-width: 700px !important;
        width: min(calc(100vw - 16px), 700px) !important;
    }
    
    .auto-tool-sections {
        flex-direction: row;
        align-items: flex-start;
    }
    
    .auto-tool-section {
        flex: 1;
    }
}

/* Fork dialog sections should always stack vertically */
#forkDialog .auto-tool-sections {
    flex-direction: column !important;
}

/* Fork dialog max width */
#forkDialog {
    max-width: 600px !important;
    width: min(calc(100vw - 16px), 600px) !important;
}

/* Hint dialog sections should always stack vertically */
#hintDialog .auto-tool-sections {
    flex-direction: column !important;
}

/* Hint dialog max width */
#hintDialog {
    max-width: 450px !important;
    width: min(calc(100vw - 16px), 450px) !important;
}

#autoToolDialog {
    max-height: 85vh;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--neon-cyan) #1a1a24;
}

#autoToolDialog::-webkit-scrollbar {
    width: 8px;
}

#autoToolDialog::-webkit-scrollbar-track {
    background: #1a1a24;
    border-left: 1px solid #333;
}

#autoToolDialog::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--neon-cyan) 0%, #0088aa 100%);
    border-radius: 2px;
    box-shadow: 0 0 6px var(--neon-cyan);
}

#autoToolDialog::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #00ffff 0%, var(--neon-cyan) 100%);
    box-shadow: 0 0 10px var(--neon-cyan);
}

/* Tutorial mode hint toast - persistent, no auto-hide */
.hint-toast.tutorial-mode {
    cursor: default;
}

/* Tutorial persistent highlights - infinite animation */
.tutorial-persistent.hint-highlight-cell {
    animation: hint-cell-pulse 1s ease-in-out infinite;
}

.tutorial-persistent.hint-highlight-cell::after {
    animation: hint-border-pulse 1s ease-in-out infinite;
}

.tutorial-persistent.hint-highlight-row,
.tutorial-persistent.hint-highlight-col {
    animation: hint-pulse 1s ease-in-out infinite;
}

.count-neon.hint-highlight-label.tutorial-persistent {
    animation: hint-label-pulse 1s ease-in-out infinite;
}

/* Tutorial tool highlight - pulsing border on mode buttons */
.mode-btn.tutorial-tool-highlight {
    animation: tutorial-tool-pulse 1s ease-in-out infinite;
    position: relative;
}

@keyframes tutorial-tool-pulse {
    0%, 100% {
        box-shadow: 0 0 8px 2px var(--btn-hint-color, #ffcc00),
                    inset 0 0 4px rgba(255, 204, 0, 0.3);
        border-color: var(--btn-hint-color, #ffcc00);
    }
    50% {
        box-shadow: 0 0 16px 4px var(--btn-hint-color, #ffcc00),
                    inset 0 0 8px rgba(255, 204, 0, 0.5);
        border-color: var(--btn-hint-color, #ffcc00);
    }
}

/* Hint Toast - Android-style bottom toast */
.below-board-area {
    height: 0;
    padding: 0;
}

.hint-toast {
    position: fixed;
    left: 50%;
    top: 0;
    transform: translateX(-50%) translateY(16px);
    background: rgba(5, 5, 6, 0.95);
    border: 2px solid var(--btn-hint-color, var(--neon-yellow, #ffcc00));
    box-shadow: 0 0 20px rgba(255, 204, 0, 0.4);
    padding: 12px 18px;
    box-sizing: border-box;
    width: min(400px, calc(100vw - 16px));
    max-width: min(calc(100vw - 16px), 400px);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
    cursor: pointer;
    pointer-events: none;
    border-radius: 8px;
}

.hint-toast.visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}

.hint-toast.fading {
    opacity: 0;
    transform: translateX(-50%) translateY(16px);
}

.hint-toast-content {
    text-align: center;
}

.hint-toast-message {
    font-family: var(--font-mono, 'Courier New', monospace);
    font-size: 13px;
    color: #ccc;
    line-height: 1.5;
}

/* Hint Highlight Styles */
.hint-highlight-row {
    animation: hint-pulse 1s ease-in-out 3;
}

.hint-highlight-col {
    animation: hint-pulse 1s ease-in-out 3;
}

.hint-highlight-cell {
    animation: hint-cell-pulse 1s ease-in-out 3;
    position: relative;
}

.hint-highlight-cell::after {
    content: '';
    position: absolute;
    inset: 0;
    border: 2px solid var(--btn-hint-color, var(--neon-yellow, #ffcc00));
    box-shadow: 0 0 10px var(--btn-hint-color, var(--neon-yellow, #ffcc00)), inset 0 0 10px rgba(255, 204, 0, 0.2);
    pointer-events: none;
    animation: hint-border-pulse 1s ease-in-out 3;
}

@keyframes hint-pulse {
    0%, 100% { background-color: transparent; }
    50% { background-color: rgba(255, 204, 0, 0.15); }
}

@keyframes hint-cell-pulse {
    0%, 100% { background-color: rgba(255, 204, 0, 0); }
    50% { background-color: rgba(255, 204, 0, 0.25); }
}

@keyframes hint-border-pulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

/* Row/Column label highlight */
.count-neon.hint-highlight-label {
    animation: hint-label-pulse 1s ease-in-out 3;
}

@keyframes hint-label-pulse {
    0%, 100% {
        color: var(--btn-hint-color, var(--neon-yellow, #ffcc00));
        text-shadow: 0 0 5px var(--btn-hint-color, var(--neon-yellow, #ffcc00));
    }
    50% {
        color: #fff;
        text-shadow: 0 0 15px var(--btn-hint-color, var(--neon-yellow, #ffcc00)), 0 0 30px var(--btn-hint-color, var(--neon-yellow, #ffcc00));
    }
}

/* Cell coordinate labels shown during hints */
.cell-coord-label {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono, 'Courier New', monospace);
    font-size: clamp(8px, calc(var(--cell-size) * 0.28), 16px);
    font-weight: bold;
    color: rgba(100, 100, 100, 0.4);
    pointer-events: none;
    z-index: 2;
    animation: coord-fade-in 0.3s ease-out;
}

.cell-coord-label.fading {
    animation: coord-fade-out 0.3s ease-out forwards;
}

@keyframes coord-fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes coord-fade-out {
    from { opacity: 1; }
    to { opacity: 0; }
}

.scan-lines {
    position: absolute; inset: 0; z-index: 1; pointer-events: none;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 255, 159, 0.03) 2px,
        rgba(0, 255, 159, 0.03) 4px
    );
    animation: scan-move 8s linear infinite;
}
.scan-lines::after {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(
        180deg,
        transparent 0%,
        rgba(0, 255, 159, 0.1) 50%,
        transparent 100%
    );
    height: 100px; animation: scan-bar 3s ease-in-out infinite;
}

.cell-victory-glow {
    animation: cell-glow-pulse 0.4s ease-out forwards;
}
.cell-victory-glow::after {
    content: ''; position: absolute; inset: 0; z-index: 100;
    background: radial-gradient(circle, rgba(0, 255, 159, 0.6) 0%, transparent 70%);
    animation: glow-fade 0.6s ease-out forwards;
}

@keyframes victory-fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes victory-content-in { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes scan-move { from { background-position-y: 0; } to { background-position-y: 100px; } }
@keyframes scan-bar { 0%, 100% { transform: translateY(-100px); } 50% { transform: translateY(calc(100% + 100px)); } }
@keyframes cell-glow-pulse { 0% { background-color: var(--bg-black); } 50% { background-color: rgba(0, 255, 159, 0.3); } 100% { background-color: rgba(0, 255, 159, 0.1); } }
@keyframes glow-fade { from { opacity: 1; } to { opacity: 0; } }

/* Briefing Modal */
#briefingOverlay {
    position: fixed; inset: 0; background: rgba(5, 5, 6, 0.95);
    z-index: 500; display: none; align-items: center; justify-content: center;
    padding: 20px;
}
.briefing-modal {
    max-width: 600px; width: 100%; max-height: 85vh; overflow-y: auto;
    background: #0f0f14; border: 2px solid var(--neon-cyan);
    box-shadow: 0 0 30px rgba(0, 243, 255, 0.2); padding: 24px;
    font-family: var(--font-mono, 'Courier New', monospace); font-size: 13px; line-height: 1.7;
    scrollbar-width: thin;
    scrollbar-color: var(--neon-cyan) #1a1a24;
}
.briefing-modal::-webkit-scrollbar {
    width: 8px;
}
.briefing-modal::-webkit-scrollbar-track {
    background: #1a1a24;
    border-left: 1px solid #333;
}
.briefing-modal::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--neon-cyan) 0%, #0088aa 100%);
    border-radius: 2px;
    box-shadow: 0 0 6px var(--neon-cyan);
}
.briefing-modal::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #00ffff 0%, var(--neon-cyan) 100%);
    box-shadow: 0 0 10px var(--neon-cyan);
}
.briefing-header {
    color: var(--neon-cyan); border-bottom: 1px solid var(--neon-cyan);
    margin-bottom: 16px; padding-bottom: 8px; font-weight: 900; letter-spacing: 2px;
    font-family: var(--font-heading, 'Courier New', monospace);
}
.briefing-tabs { display: flex; gap: 0; margin-bottom: 16px; border-bottom: 1px solid #333; }
.briefing-tab {
    padding: 8px 20px; cursor: pointer; color: #666; font-weight: bold; text-transform: uppercase;
    font-size: 11px; letter-spacing: 1px; border-bottom: 2px solid transparent; transition: all 0.2s;
}
.briefing-tab:hover { color: #aaa; }
.briefing-tab.active { color: var(--neon-cyan); border-bottom-color: var(--neon-cyan); }
.briefing-content { display: none; }
.briefing-content.active { display: block; }
.briefing-section { margin-bottom: 16px; }
.briefing-section h3 { color: var(--neon-green); margin-bottom: 8px; text-transform: uppercase; font-size: 14px; }
.briefing-section p { margin: 6px 0; color: #ccc; }
.briefing-tag { color: var(--neon-amber); font-weight: bold; }
.tip-example {
    background: #0a0a0f; border: 1px solid #333; padding: 12px; margin: 10px 0;
    display: flex; gap: 15px; align-items: flex-start; flex-wrap: wrap;
}
@media (orientation: portrait) {
    .tip-example { flex-direction: column; align-items: center; }
    .tip-example .tip-explanation { text-align: center; }
}
.tip-grid {
    display: grid; gap: 2px; flex-shrink: 0;
}
.tip-cell {
    width: 24px; height: 24px; background: #111; border: 1px solid #333;
    display: flex; align-items: center; justify-content: center;
}
.tip-cell-wall { background: var(--neon-cyan); box-shadow: 0 0 4px var(--neon-cyan); }
.tip-cell-path::after { content: ''; width: 8px; height: 8px; background: white; border-radius: 50%; }
.tip-cell-deadend::after { content: ''; width: 10px; height: 10px; border: 2px solid var(--neon-cyan); background: #000; }
.tip-cell-stockpile {
    background: linear-gradient(135deg, #1a0a2e 0%, #0a0a1a 100%);
    border-color: var(--neon-green);
    box-shadow: 0 0 4px var(--neon-green), inset 0 0 3px rgba(0, 255, 159, 0.3);
}
.tip-cell-stockpile::after {
    content: ''; width: 10px; height: 10px;
    background: var(--neon-green);
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
}
.tip-cell-maybe { background: rgba(255, 170, 0, 0.15); border-color: var(--neon-amber); }
.tip-cell-deduced { background: rgba(0, 255, 159, 0.15); border-color: var(--neon-green); }
.tip-label { color: #888; font-size: 11px; text-align: center; padding: 2px 4px; }
.tip-explanation { flex: 1; color: #bbb; font-size: 12px; line-height: 1.6; }


.briefing-close {
    margin-top: 20px; padding: 10px 30px; font-size: 12px;
    background: transparent; border: 2px solid var(--neon-cyan);
    color: var(--neon-cyan); cursor: pointer; text-transform: uppercase;
    letter-spacing: 2px; transition: all 0.2s;
}
.briefing-close:hover { background: var(--neon-cyan); color: #000; }

/* Keyboard shortcuts */
.keyboard-shortcuts {
    display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px;
    margin-top: 12px;
}
.shortcut-item { display: flex; align-items: center; gap: 8px; }
.shortcut-key {
    background: #1a1a1f; border: 1px solid #444; padding: 4px 8px;
    font-size: 11px; color: var(--neon-cyan); min-width: 24px; text-align: center;
}
.shortcut-desc { color: #888; font-size: 11px; }

/* Level Select */
#levelSelectOverlay {
    position: fixed; inset: 0; background: rgba(5, 5, 6, 0.95);
    z-index: 500; display: none; align-items: center; justify-content: center;
    padding: 20px;
}
.level-select-modal {
    max-width: 700px; width: 100%; max-height: 85vh; overflow-y: auto;
    background: #0f0f14; border: 2px solid var(--neon-cyan);
    box-shadow: 0 0 30px rgba(0, 243, 255, 0.2); padding: 24px;
}
.level-select-header {
    color: var(--neon-cyan); border-bottom: 1px solid var(--neon-cyan);
    margin-bottom: 20px; padding-bottom: 8px; font-weight: 900;
    letter-spacing: 2px; font-family: var(--font-heading, 'Courier New', monospace);
}
.level-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(80px, 1fr)); gap: 10px;
}
.level-btn {
    aspect-ratio: 1; background: #0a0a0f; border: 2px solid #333;
    color: #666; font-family: var(--font-display, 'Courier New', monospace); font-size: 16px;
    font-weight: bold; cursor: pointer; transition: all 0.2s;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.level-btn:hover:not(.locked) { border-color: var(--neon-cyan); color: var(--neon-cyan); }
.level-btn.completed { border-color: var(--neon-green); color: var(--neon-green); background: rgba(0, 255, 159, 0.05); }
.level-btn.current { border-color: var(--neon-amber); color: var(--neon-amber); box-shadow: 0 0 10px rgba(255, 170, 0, 0.3); }
.level-btn.locked { opacity: 0.3; cursor: not-allowed; }
.level-btn .level-stars { font-size: 10px; margin-top: 4px; }
.level-select-close {
    margin-top: 20px; padding: 10px 30px; font-size: 12px;
    background: transparent; border: 2px solid var(--neon-cyan);
    color: var(--neon-cyan); cursor: pointer; text-transform: uppercase;
    letter-spacing: 2px; transition: all 0.2s;
}
.level-select-close:hover { background: var(--neon-cyan); color: #000; }

/* Responsive */
@media (max-width: 600px) {
    .header { padding: 8px 12px; }
    .header-title { font-size: 14px; }
    .header-btn { padding: 6px 10px; font-size: 10px; }
    .level-indicator { font-size: 10px; padding: 4px 8px; }
    .briefing-modal { padding: 16px; font-size: 12px; }
    .keyboard-shortcuts { grid-template-columns: 1fr; }
}

/* Inline cell depictions */
.cell-icon {
    display: inline-flex; align-items: center; justify-content: center;
    width: 22px; height: 22px; vertical-align: middle; margin: 0 3px;
    background: var(--bg-black); border: 1px solid rgba(0, 243, 255, 0.4);
}
.cell-icon-wall {
    background: var(--neon-cyan); box-shadow: 0 0 6px var(--neon-cyan);
}
.cell-icon-locked {
    background: var(black,);
    opacity: 0.4;
    outline: 2px solid rgba(255, 255, 255, 0.6);
    outline-offset: -2px;
    background-image: repeating-linear-gradient(
        45deg,
        rgba(255, 255, 255, 0.25) 0px,
        rgba(255, 255, 255, 0.25) 2px,
        rgba(0, 0, 0, 0) 2px,
        rgba(0, 0, 0, 0) 4px
    );
}
.cell-icon-path {
    position: relative;
}
.cell-icon-path::after {
    content: ''; width: 8px; height: 8px; background: white; border-radius: 50%;
    box-shadow: 0 0 5px white;
}
.cell-icon-deadend {
    position: relative;
}
.cell-icon-deadend::after {
    content: ''; width: 12px; height: 12px; background: #000;
    border: 2px solid var(--neon-cyan); box-shadow: 0 0 6px var(--neon-cyan);
}
.cell-icon-deadend-ok::after {
    border-color: var(--neon-green); box-shadow: 0 0 6px var(--neon-green);
}
.cell-icon-stockpile {
    position: relative;
    background: linear-gradient(135deg, #1a0a2e 0%, #0a0a1a 100%);
    border-color: var(--neon-amber);
    box-shadow: 0 0 6px var(--neon-amber), inset 0 0 4px rgba(255, 170, 0, 0.3);
}
.cell-icon-stockpile::after {
    content: ''; width: 10px; height: 10px;
    background: var(--neon-amber);
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
}
.briefing-row { display: flex; align-items: center; margin: 10px 0; gap: 10px; }
.briefing-row-label { flex: 1; }

/* Keyframe Animations */
@keyframes anchor-pulse { 0%, 100% { opacity: 0.4; transform: rotate(45deg) scale(0.9); } 50% { opacity: 1; transform: rotate(45deg) scale(1.1); } }
@keyframes jitter-fast { 0% { transform: translate(1px, 1px); } 50% { transform: translate(-1px, -1px); } 100% { transform: translate(1px, 1px); } }
@keyframes cell-jitter { 0%, 100% { opacity: 1; } 50% { opacity: 0.6; transform: scale(0.98); } }
@keyframes core-pulse { 0%, 100% { opacity: 0.4; transform: scale(0.6); } 50% { opacity: 1; transform: scale(1.1); } }
@keyframes core-pulse-fast { 0%, 100% { transform: scale(0.5); opacity: 0.3; } 50% { transform: scale(1.3); opacity: 1; } }
@keyframes err-pulse { 0%, 100% { transform: scale(1); opacity: 1; } 50% { transform: scale(1.12); opacity: 0.8; } }

/* Utility */
.hidden { display: none !important; }
.visible { display: flex !important; }

/* Tailwind replacements */
.briefing-footer {
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.briefing-checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: #888;
    cursor: pointer;
    user-select: none;
}

.briefing-checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--neon-cyan, #0ff);
    cursor: pointer;
}

.briefing-checkbox-label:hover {
    color: #aaa;
}

.layer-indicator {
    padding-left: 0.75rem;
    border-left: 1px solid rgba(255, 255, 255, 0.2);
}

.layer-name {
    font-size: 10px;
    text-transform: uppercase;
    font-weight: 900;
    letter-spacing: 0.1em;
    color: var(--neon-cyan);
}

/* Answer key overlay on cells */
.answer-key-overlay {
    position: absolute;
    inset: 2px;
    background: rgba(255, 170, 0, 0.25);
    border: 1px dashed rgba(255, 170, 0, 0.6);
    border-radius: 2px;
    pointer-events: none;
    z-index: 5;
}

/* ============================================
   THEME SYSTEM SUPPORT
   ============================================ */

/* Theme selector styling */
.theme-select {
    background: var(--bg-black);
    color: var(--neon-cyan);
    border: 1px solid var(--neon-cyan);
    font-size: 12px;
    padding: 2.5px 8px;
    border-radius: 2px;
    touch-action: manipulation;
}

/* Image-based element support */
.wall-image {
    background-color: transparent !important;
    box-shadow: none;
}

.wall-image.wall-error {
    filter: hue-rotate(-60deg) saturate(1.5);
    animation: err-pulse 1.5s ease-in-out infinite;
    animation-delay: var(--anim-delay, 0ms);
}

.path-dot-image {
    background-color: transparent !important;
    box-shadow: none !important;
}

.path-dot-image.path-dot-complete {
    filter: hue-rotate(60deg) brightness(1.2);
}

.path-dot-image.path-dot-error {
    filter: hue-rotate(-60deg) saturate(2);
}

.node-image {
    background-color: transparent !important;
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
}

.node-image.node-complete {
    filter: brightness(1.3) saturate(1.2);
}

.node-image.node-conflict {
    filter: hue-rotate(-60deg) saturate(2);
    animation: jitter-fast 0.08s infinite;
}

.stockpile-image {
    background-color: transparent !important;
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
}

.stockpile-image .stockpile-icon {
    display: none;
}

/* Opacity utility for dimmed layers */
.opacity-40 {
    opacity: 0.4;
}

/* ============================================
   DAILY PUZZLE STYLES
   ============================================ */

/* Highlighted menu item for daily puzzle */
.menu-item-highlight {
    background: linear-gradient(135deg, rgba(0, 243, 255, 0.15) 0%, rgba(255, 200, 0, 0.15) 100%);
    border: 1px solid var(--neon-cyan);
    position: relative;
}

.menu-item-highlight::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(0, 243, 255, 0.1), transparent);
    animation: daily-shine 3s ease-in-out infinite;
}

@keyframes daily-shine {
    0%, 100% { opacity: 0; transform: translateX(-100%); }
    50% { opacity: 1; transform: translateX(100%); }
}

.menu-item-highlight:hover {
    background: linear-gradient(135deg, rgba(0, 243, 255, 0.25) 0%, rgba(255, 200, 0, 0.25) 100%);
    border-color: var(--neon-green);
}

/* Daily puzzle mode indicator on header */
.header-strip.daily-puzzle-mode {
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.95) 0%, rgba(0, 50, 50, 0.9) 100%);
    border-bottom: 2px solid var(--neon-cyan);
}

/* Daily complete dialog stats */
.daily-complete-stats {
    background: rgba(0, 243, 255, 0.05);
    border: 1px solid rgba(0, 243, 255, 0.2);
    border-radius: 8px;
    padding: 12px 16px;
    margin: 16px 0;
}

.daily-complete-stats .stat-row {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    border-bottom: 1px solid rgba(0, 243, 255, 0.1);
}

.daily-complete-stats .stat-row:last-child {
    border-bottom: none;
}

.daily-complete-stats .stat-label {
    color: #888;
    font-size: 14px;
}

.daily-complete-stats .stat-value {
    color: var(--neon-cyan);
    font-weight: bold;
    font-size: 14px;
    text-shadow: 0 0 5px var(--neon-cyan);
}

/* Daily complete dialog buttons */
.daily-complete-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.btn-share {
    background: linear-gradient(180deg, rgba(0, 150, 200, 0.3) 0%, rgba(0, 100, 150, 0.2) 100%);
    border-color: var(--neon-cyan);
    color: var(--neon-cyan);
}

.btn-share:hover {
    background: linear-gradient(180deg, rgba(0, 200, 255, 0.4) 0%, rgba(0, 150, 200, 0.3) 100%);
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.4);
}

.btn-share.btn-copied {
    background: linear-gradient(180deg, rgba(0, 200, 100, 0.4) 0%, rgba(0, 150, 80, 0.3) 100%);
    border-color: var(--neon-green);
    color: var(--neon-green);
    text-shadow: 0 0 5px var(--neon-green);
}