/* Dark neumorphic UI — cube / renderer unchanged */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

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

html {
    height: 100%;
    overflow: hidden;
}

:root {
    --bg: #1a1a1a;
    --surface: #242424;
    --surface-hover: #2c2c2c;
    --text: #ffffff;
    --text-muted: #888888;
    --text-dim: #666666;
    --accent: linear-gradient(135deg, #ffb347 0%, #ff6b9d 50%, #b44dff 100%);
    --accent-glow: 0 4px 20px rgba(255, 107, 157, 0.35);
    --neo-dark: 6px 6px 14px rgba(0, 0, 0, 0.55);
    --neo-light: -5px -5px 12px rgba(255, 255, 255, 0.04);
    --neo-inset-dark: inset 4px 4px 10px rgba(0, 0, 0, 0.5);
    --neo-inset-light: inset -3px -3px 8px rgba(255, 255, 255, 0.03);
    --radius: 16px;
    --radius-sm: 12px;
    --radius-xs: 10px;
    --scrollbar-size: 8px;
    --scrollbar-track: #1e1e1e;
    --scrollbar-thumb: #3d3d3d;
    --scrollbar-thumb-hover: #4f4f4f;
}

body {
    font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    height: 100%;
    min-height: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--bg);
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
    z-index: 2;
}

header h1 {
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: var(--accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

#status {
    font-size: 0.8rem;
    font-weight: 600;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    background: var(--surface);
    box-shadow: var(--neo-dark), var(--neo-light);
    color: var(--text-muted);
}

#status.status-solved {
    background: var(--accent);
    -webkit-background-clip: unset;
    background-clip: unset;
    -webkit-text-fill-color: #fff;
    color: #fff;
    box-shadow: var(--accent-glow);
}

#status.status-scrambled {
    color: #ffb347;
}

#main-layout {
    display: flex;
    flex: 1 1 0;
    min-height: 0;
    min-width: 0;
    overflow: hidden;
}

#canvas-container {
    flex: 1 1 0;
    min-width: 0;
    min-height: 0;
    position: relative;
    cursor: grab;
    background: var(--bg);
    overflow: hidden;
}
#canvas-container:active { cursor: grabbing; }
#canvas-container canvas {
    display: block;
    width: 100% !important;
    height: 100% !important;
}

#sidebar {
    width: 460px;
    max-width: 42vw;
    min-width: 400px;
    background: var(--bg);
    display: flex;
    flex-direction: column;
    padding: 10px;
    gap: 8px;
    overflow: hidden;
    flex-shrink: 0;
    min-height: 0;
}

.panel {
    background: var(--surface);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    border: none;
    box-shadow: var(--neo-dark), var(--neo-light);
    flex-shrink: 0;
}

.panel-puzzle {
    flex-shrink: 0;
}

.sidebar-split {
    flex: 1 1 0;
    min-height: 0;
    display: flex;
    flex-direction: row;
    gap: 8px;
    overflow: hidden;
}

.sidebar-main-column {
    flex: 1 1 0;
    min-width: 0;
    min-height: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
    overflow: hidden;
}

.panel-log {
    flex: 0 0 50%;
    max-height: 50%;
    min-width: 0;
    min-height: 0;
    display: flex;
    flex-direction: column;
    padding: 8px 10px;
    overflow: hidden;
}

.panel-guide {
    flex: 1 1 0;
    min-height: 0;
    padding: 8px 10px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

.panel-guide::-webkit-scrollbar {
    width: var(--scrollbar-size);
}

.panel-guide::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 4px;
}

.sidebar-tools-strip {
    width: 152px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-height: 0;
    overflow-x: hidden;
    overflow-y: auto;
}

.panel-compact {
    padding: 8px 10px;
}

.panel-compact h3 {
    margin-bottom: 6px;
}

.panel-controls {
    flex-shrink: 0;
}

.panel h3 {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 8px;
    font-weight: 600;
}

.btn-row {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.btn-row-compact {
    flex-wrap: nowrap;
    gap: 6px;
}

.btn-row-compact button {
    flex: 1 1 0;
    min-width: 0;
    padding: 8px 6px;
    font-size: 0.7rem;
}

.puzzle-btn-row {
    margin-top: 6px;
}

.puzzle-btn-row:first-of-type {
    margin-top: 8px;
}

.rotation-speed-row {
    margin-top: 6px;
    margin-bottom: 2px;
}

button {
    background: var(--surface);
    border: none;
    color: var(--text);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    cursor: pointer;
    font-size: 0.74rem;
    font-weight: 500;
    font-family: inherit;
    transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
    box-shadow: var(--neo-dark), var(--neo-light);
}
button:hover {
    background: var(--surface-hover);
    transform: translateY(-1px);
}
button:active {
    transform: translateY(0);
    box-shadow: var(--neo-inset-dark), var(--neo-inset-light);
}

button.btn-accent {
    background: var(--accent);
    color: #fff;
    font-weight: 600;
    box-shadow: var(--accent-glow);
}
button.btn-accent:hover {
    filter: brightness(1.08);
    transform: translateY(-1px);
}
button.btn-accent:active {
    filter: brightness(0.95);
    box-shadow: var(--neo-inset-dark);
}

button.active {
    background: var(--accent);
    color: #fff;
    font-weight: 600;
    box-shadow: var(--accent-glow);
}

button.danger {
    color: #ff8a8a;
    background: var(--surface);
}
button.danger:hover {
    color: #ffaaaa;
    background: #2a2020;
}

#face-grid,
.face-grid-strip {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
}

.face-grid-strip .face-btn {
    padding: 6px 4px;
    font-size: 0.62rem;
    gap: 3px;
}

.face-grid-strip .face-swatch {
    width: 10px;
    height: 10px;
}

.face-btn {
    padding: 7px 5px;
    font-size: clamp(0.58rem, 1.5vw, 0.68rem);
    font-weight: 600;
    border-radius: var(--radius-xs);
    text-align: center;
    display: flex;
    align-items: center;
    gap: 4px;
    justify-content: center;
    white-space: nowrap;
    min-width: 0;
}

.face-swatch {
    width: 12px;
    height: 12px;
    border-radius: 4px;
    flex-shrink: 0;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
}

select {
    background: var(--surface);
    border: none;
    color: var(--text);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    font-size: 0.74rem;
    font-weight: 500;
    font-family: inherit;
    width: 100%;
    cursor: pointer;
    box-shadow: var(--neo-inset-dark), var(--neo-inset-light);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23888' d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 32px;
}
select:focus {
    outline: none;
    box-shadow: var(--neo-inset-dark), var(--neo-inset-light), 0 0 0 2px rgba(255, 107, 157, 0.25);
}

select + select {
    margin-top: 8px;
}

footer {
    padding: 6px 16px;
    background: var(--bg);
    font-size: 0.68rem;
    color: var(--text-dim);
    flex-shrink: 0;
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.25);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

#hint {
    color: var(--text-muted);
}

.scramble-length-row {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.72rem;
    margin-bottom: 4px;
    color: var(--text-muted);
}

.scramble-length-row > span:first-child {
    flex-shrink: 0;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.scramble-length-row input[type="range"] {
    flex: 1 1 auto;
    min-width: 0;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--bg);
    border-radius: 4px;
    box-shadow: var(--neo-inset-dark), var(--neo-inset-light);
    cursor: pointer;
}

.scramble-length-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: var(--accent-glow);
    border: none;
    cursor: pointer;
}

.scramble-length-row input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: linear-gradient(135deg, #ffb347 0%, #ff6b9d 50%, #b44dff 100%);
    box-shadow: var(--accent-glow);
    border: none;
    cursor: pointer;
}

.scramble-length-row input[type="range"]::-moz-range-track {
    height: 8px;
    background: var(--bg);
    border-radius: 4px;
    box-shadow: var(--neo-inset-dark), var(--neo-inset-light);
}

.scramble-length-row output {
    min-width: 1.6em;
    text-align: right;
    font-variant-numeric: tabular-nums;
    font-weight: 600;
    color: var(--text);
    background: var(--surface);
    padding: 2px 6px;
    border-radius: var(--radius-xs);
    box-shadow: var(--neo-dark), var(--neo-light);
}

.scramble-length-hint {
    font-size: 0.62rem;
    color: var(--text-muted);
    margin: 0 0 8px;
    line-height: 1.35;
}

/* Twist layer / plane — same palette as scramble length */
.twist-option-group {
    border: none;
    margin: 0 0 8px;
    padding: 0;
    min-width: 0;
}

.twist-option-group:last-of-type {
    margin-bottom: 6px;
}

.twist-option-label {
    display: block;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    margin-bottom: 6px;
    padding: 0;
}

.twist-radio-row {
    display: flex;
    gap: 4px;
    background: var(--bg);
    border-radius: var(--radius-xs);
    padding: 4px;
    box-shadow: var(--neo-inset-dark), var(--neo-inset-light);
}

.twist-radio {
    flex: 1 1 0;
    min-width: 0;
    cursor: pointer;
    position: relative;
}

.twist-radio input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    margin: 0;
}

.twist-radio span {
    display: block;
    text-align: center;
    font-size: 0.62rem;
    font-weight: 500;
    color: var(--text-muted);
    padding: 6px 2px;
    border-radius: 8px;
    transition: color 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
    user-select: none;
}

.twist-radio:hover span {
    color: var(--text);
}

.twist-radio input:checked + span {
    color: #fff;
    font-weight: 600;
    background: linear-gradient(135deg, #ffb347 0%, #ff6b9d 50%, #b44dff 100%);
    box-shadow: var(--accent-glow);
}

.twist-radio input:focus-visible + span {
    outline: 2px solid rgba(255, 107, 157, 0.45);
    outline-offset: 1px;
}

.panel-twist .twist-twist-btns {
    margin-top: 4px;
}

.panel-puzzle .solve-progress {
    font-size: 0.68rem;
    color: var(--text-muted);
    margin-top: 8px;
    margin-bottom: 0;
    min-height: 1.2em;
    line-height: 1.35;
}

.solve-log-wrap {
    flex: 1 1 0;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

.solve-log-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    margin-bottom: 6px;
    flex-shrink: 0;
}

.solve-log-clear {
    font-size: 0.62rem;
    padding: 2px 8px;
    border-radius: 4px;
    background: transparent;
    color: var(--text-muted);
    border: 1px solid rgba(255, 255, 255, 0.12);
    cursor: pointer;
}

.solve-log-clear:hover {
    color: var(--text);
    border-color: rgba(255, 255, 255, 0.25);
}

.solve-log {
    flex: 1 1 0;
    min-height: 0;
    overflow-y: auto;
    font-size: 0.65rem;
    line-height: 1.4;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    background: rgba(0, 0, 0, 0.25);
    border-radius: 6px;
    padding: 6px 8px;
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

.solve-log::-webkit-scrollbar {
    width: var(--scrollbar-size);
}

.solve-log::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
    border-radius: 4px;
    margin: 4px 0;
    box-shadow: var(--neo-inset-dark), var(--neo-inset-light);
}

.solve-log::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #4a4a4a 0%, var(--scrollbar-thumb) 100%);
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: var(--neo-dark), var(--neo-light);
}

.solve-log::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #5c5c5c 0%, var(--scrollbar-thumb-hover) 100%);
}

.solve-log::-webkit-scrollbar-thumb:active {
    background: #353535;
    box-shadow: var(--neo-inset-dark), var(--neo-inset-light);
}

.solve-log-step {
    padding: 3px 4px;
    border-radius: 4px;
    margin-bottom: 2px;
}

.solve-log-step.active {
    background: rgba(100, 180, 255, 0.18);
    outline: 1px solid rgba(100, 180, 255, 0.35);
}

.solve-log-num {
    color: var(--text-muted);
    margin-right: 6px;
    user-select: none;
}

.solve-log-detail {
    margin-left: 1.4em;
    color: var(--text-muted);
    font-size: 0.92em;
    margin-top: 1px;
}

.solve-log-phase .solve-log-msg { color: #9ecfff; }
.solve-log-search .solve-log-msg { color: #c9a0ff; }
.solve-log-move .solve-log-msg { color: #a8e6a3; }
.solve-log-history .solve-log-msg { color: #f0c674; }
.solve-log-done .solve-log-msg { color: #8fd4a0; }
.solve-log-error .solve-log-msg { color: #f28b82; }

.instructions {
    font-size: 0.62rem;
    color: var(--text-muted);
    line-height: 1.35;
}
.instructions span {
    display: block;
    margin-bottom: 4px;
}

.guide-list {
    margin: 0;
    font-size: 0.6rem;
    line-height: 1.4;
    color: var(--text-muted);
}

.guide-list dt {
    margin: 8px 0 2px;
    font-size: 0.62rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text);
}

.guide-list dt:first-child {
    margin-top: 0;
}

.guide-list dd {
    margin: 0;
}

.guide-list strong {
    color: #ccc;
    font-weight: 600;
}

.glance-list {
    margin: 0;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 4px 8px;
    font-size: 0.6rem;
    line-height: 1.3;
}

.glance-list dt {
    margin: 0;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
}

.glance-list dd {
    margin: 0;
    color: var(--text);
    font-weight: 500;
    text-align: right;
    word-break: break-word;
}

#sel-face {
    font-size: 0.58rem;
}

.glance-solved {
    color: #7dcea0;
}

.glance-scrambled {
    color: #ffb347;
}

.panel-glance {
    flex-shrink: 0;
}

.sidebar-tools-strip .btn-row-compact button {
    font-size: 0.65rem;
    padding: 7px 4px;
}

kbd {
    background: var(--bg);
    border: none;
    border-radius: 6px;
    padding: 3px 7px;
    font-family: inherit;
    font-size: 0.68rem;
    font-weight: 600;
    color: var(--text);
    box-shadow: var(--neo-inset-dark), var(--neo-inset-light);
}

.sidebar-tools-strip {
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

.sidebar-tools-strip::-webkit-scrollbar {
    width: var(--scrollbar-size);
}

.sidebar-tools-strip::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
    border-radius: 4px;
    box-shadow: var(--neo-inset-dark), var(--neo-inset-light);
}

.sidebar-tools-strip::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #4a4a4a 0%, var(--scrollbar-thumb) 100%);
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: var(--neo-dark), var(--neo-light);
}

.sidebar-tools-strip::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #5c5c5c 0%, var(--scrollbar-thumb-hover) 100%);
}

@media (max-height: 720px) {
    header h1 { font-size: 1.1rem; }
    #status { font-size: 0.72rem; padding: 6px 10px; }
    .panel { padding: 8px 10px; }
    .panel h3 { margin-bottom: 6px; }
    button { padding: 6px 8px; font-size: 0.7rem; }
    .face-btn {
        padding: 5px 4px;
        font-size: clamp(0.56rem, 1.4vw, 0.64rem);
        white-space: nowrap;
    }
    footer { display: none; }
}