/* ==========================================================================
   Tool-Specific Distinct Layouts & Interactive Components
   ========================================================================== */

.split-workbench {
    display: grid;
    grid-template-columns: 330px 1fr;
    gap: 15.5px;
    align-items: start;
}

.row-flex {
    display: flex;
    align-items: center;
    gap: 8.5px;
    flex-wrap: wrap;
}

.row-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 11px;
    flex-wrap: wrap;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 11px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 11px;
}

.stack-sm { display: flex; flex-direction: column; gap: 8.5px; }
.stack-md { display: flex; flex-direction: column; gap: 15.5px; }

/* --------------------------------------------------------------------------
   00. Random Group Generator (Workbench + Group Cards)
   -------------------------------------------------------------------------- */
.rg-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 11px;
    flex-wrap: wrap;
    margin-bottom: 15.5px;
}

.rg-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(214px, 1fr));
    gap: 11px;
}

.rg-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-top: 3px solid var(--group-color, var(--accent));
    border-radius: var(--radius-sm);
    padding: 12px 13.5px;
}

.rg-card-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8.5px;
    padding-bottom: 6.5px;
    border-bottom: 1px solid var(--border-subtle);
}

.rg-card-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 15px;
}

.rg-card-count {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-muted);
}

.rg-member-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.rg-member {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 4px 7.5px;
    border-radius: 4px;
    font-size: 14.5px;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background 0.12s ease, border-color 0.12s ease;
}

.rg-member:hover {
    background: var(--bg-muted);
}

.rg-member.is-selected {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
    font-weight: 600;
}

.rg-rule-pill {
    display: inline-flex;
    align-items: center;
    gap: 5.5px;
    font-family: var(--font-mono);
    font-size: 12px;
    padding: 3px 8.5px;
    background: var(--bg-muted);
    border-radius: 4px;
}

/* --------------------------------------------------------------------------
   01. Random Picker (Center Spotlight Stage)
   -------------------------------------------------------------------------- */
.picker-stage {
    text-align: center;
    padding: 31px 19.5px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    margin-bottom: 15.5px;
    position: relative;
}

.picker-readout {
    font-family: var(--font-display);
    font-size: clamp(29px, 5vw, 46px);
    font-weight: 700;
    letter-spacing: -0.03em;
    min-height: 59px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
}

.picker-readout.is-winner {
    color: var(--accent);
}

.picker-sub-readout {
    font-family: var(--font-mono);
    font-size: 12.5px;
    color: var(--text-muted);
    margin-top: 4px;
}

.picker-history-tape {
    display: flex;
    gap: 6.5px;
    flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   02. Random Number Picker (Telemetry LCD + Grid)
   -------------------------------------------------------------------------- */
.rng-lcd {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 24px 19.5px;
    margin-bottom: 15.5px;
}

.rng-hero-num {
    font-family: var(--font-mono);
    font-size: clamp(44px, 8vw, 75px);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 1;
    color: var(--accent);
}

.rng-batch-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8.5px;
}

.rng-cell {
    min-width: 59px;
    padding: 8.5px 13.5px;
    text-align: center;
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 17.5px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xs);
}

.rng-stats-strip {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8.5px;
    margin-top: 13.5px;
    padding-top: 13.5px;
    border-top: 1px solid var(--border-subtle);
}

.stat-box {
    background: var(--bg-elevated);
    padding: 8.5px 11px;
    border-radius: var(--radius-xs);
    border: 1px solid var(--border-subtle);
}

.stat-k {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
}

.stat-v {
    font-family: var(--font-mono);
    font-size: 16.5px;
    font-weight: 700;
    margin-top: 2px;
}

/* --------------------------------------------------------------------------
   03. Random Wheel Picker (Canvas Stage + Slice Editor)
   -------------------------------------------------------------------------- */
.wheel-layout {
    display: grid;
    grid-template-columns: 1fr 297px;
    gap: 17.5px;
    align-items: start;
}

.wheel-stage {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 19.5px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
}

.wheel-wrap {
    position: relative;
    width: 100%;
    max-width: 429px;
    aspect-ratio: 1;
}

.wheel-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.wheel-pointer {
    position: absolute;
    top: -6px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 11px solid transparent;
    border-right: 11px solid transparent;
    border-top: 22px solid var(--accent);
    filter: drop-shadow(0 2px 3px rgba(0, 0, 0, 0.25));
    z-index: 4;
}

.wheel-spin-hub {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 64px;
    height: 64px;
    border-radius: 50%;
    border: 3px solid var(--bg-surface);
    background: var(--text-primary);
    color: var(--bg-surface);
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.06em;
    box-shadow: var(--shadow-md);
    z-index: 5;
}

#rwp-stage:fullscreen {
    padding: 27px 35px;
    justify-content: space-between;
}

#rwp-stage:fullscreen .wheel-wrap {
    max-width: none;
    width: min(74vh, 84vw);
    height: min(74vh, 84vw);
}

#rwp-stage:fullscreen .wheel-pointer {
    border-left-width: 15px;
    border-right-width: 15px;
    border-top-width: 30px;
}

#rwp-stage:fullscreen .wheel-spin-hub {
    width: 86px;
    height: 86px;
    font-size: 15.5px;
    border-width: 4px;
}

.wheel-modal-backdrop {
    position: fixed;
    inset: 0;
    z-index: 210;
    background: rgba(12, 12, 14, 0.58);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 19.5px;
}

.wheel-modal {
    width: 100%;
    max-width: 429px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-top: 5px solid var(--winner-color, var(--accent));
    border-radius: var(--radius-md);
    padding: 27px 22px 22px;
    text-align: center;
    box-shadow: var(--shadow-md);
    animation: toast-in 0.18s ease forwards;
}

.wheel-modal-tag {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    text-transform: uppercase;
}

.wheel-modal-name {
    font-family: var(--font-display);
    font-size: 31px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 11px 0 8.5px;
    word-break: break-word;
}

.wheel-modal-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 11px;
    margin-top: 19.5px;
}

/* --------------------------------------------------------------------------
   04. Random Color Generator (Vertical Swatch Columns)
   -------------------------------------------------------------------------- */
.palette-columns {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8.5px;
    margin-bottom: 15.5px;
}

.swatch-col {
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-subtle);
    overflow: hidden;
    background: var(--bg-surface);
    display: flex;
    flex-direction: column;
}

.swatch-block {
    height: 220px;
    padding: 11px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: background-color 0.2s ease;
}

.swatch-contrast {
    align-self: flex-start;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 700;
    padding: 2px 6.5px;
    border-radius: 3px;
    background: rgba(0, 0, 0, 0.24);
    color: #FFFFFF;
}

.swatch-lock-btn {
    align-self: flex-end;
    width: 31px;
    height: 31px;
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.35);
    background: rgba(0, 0, 0, 0.28);
    color: #FFFFFF;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.swatch-meta {
    padding: 10px 11px;
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.swatch-hex {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 14.5px;
    background: none;
    border: none;
    padding: 0;
    text-align: left;
}

.swatch-sub {
    font-family: var(--font-mono);
    font-size: 11.5px;
    color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   05. Random Date Generator (Timeline Strip)
   -------------------------------------------------------------------------- */
.date-timeline {
    display: flex;
    flex-direction: column;
    gap: 8.5px;
}

.date-node {
    display: grid;
    grid-template-columns: 81px 1fr auto;
    align-items: center;
    gap: 13.5px;
    padding: 11px 15.5px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-left: 3px solid var(--cobalt);
    border-radius: var(--radius-xs);
}

.date-dow {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--cobalt);
}

.date-val {
    font-family: var(--font-mono);
    font-size: 16.5px;
    font-weight: 600;
}

/* --------------------------------------------------------------------------
   06. Random Drawing Generator (3-Slot Prompt Deck + Mini Pad)
   -------------------------------------------------------------------------- */
.prompt-deck {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 11px;
    margin-bottom: 15.5px;
}

.prompt-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: 15.5px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 123px;
}

.prompt-card.is-locked {
    border-color: var(--accent);
}

.prompt-text {
    font-family: var(--font-display);
    font-size: 17.5px;
    font-weight: 700;
    margin: 8.5px 0;
    line-height: 1.25;
}

.mini-sketch-canvas {
    width: 100%;
    height: 286px;
    background: #FFFFFF;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    touch-action: none;
    cursor: crosshair;
    display: block;
}

/* --------------------------------------------------------------------------
   07. List Randomizer (Diff Comparison Columns)
   -------------------------------------------------------------------------- */
.diff-table {
    display: flex;
    flex-direction: column;
    gap: 5.5px;
    max-height: 418px;
    overflow-y: auto;
}

.diff-row {
    display: grid;
    grid-template-columns: 39px 1fr 61px;
    align-items: center;
    gap: 8.5px;
    padding: 7.5px 11px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    font-size: 14.5px;
}

.diff-delta {
    font-family: var(--font-mono);
    font-size: 12px;
    text-align: right;
}

.diff-delta.up { color: var(--success); }
.diff-delta.down { color: var(--accent); }
.diff-delta.flat { color: var(--text-muted); }

/* --------------------------------------------------------------------------
   08. Bingo Caller (Call Tube + 75/90 Matrix)
   -------------------------------------------------------------------------- */
.bingo-top {
    display: grid;
    grid-template-columns: 242px 1fr;
    gap: 15.5px;
    margin-bottom: 15.5px;
}

.bingo-current-ball {
    aspect-ratio: 1;
    max-width: 198px;
    margin: 0 auto;
    border-radius: 50%;
    border: 4px solid var(--accent);
    background: var(--bg-elevated);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.bingo-ball-letter {
    font-family: var(--font-mono);
    font-size: 19.5px;
    font-weight: 700;
    color: var(--accent);
}

.bingo-ball-num {
    font-family: var(--font-mono);
    font-size: 57px;
    font-weight: 700;
    line-height: 1;
}

.bingo-board-75 {
    display: grid;
    grid-template-columns: 35px repeat(15, 1fr);
    gap: 4px;
}

.bingo-row-label {
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-weight: 700;
    color: var(--accent);
}

.bingo-cell {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 12.5px;
    border: 1px solid var(--border-subtle);
    border-radius: 3px;
    background: var(--bg-elevated);
    color: var(--text-muted);
}

.bingo-cell.is-called {
    background: var(--text-primary);
    color: var(--bg-surface);
    border-color: var(--text-primary);
    font-weight: 700;
}

.bingo-cell.is-latest {
    background: var(--accent);
    color: var(--accent-ink);
    border-color: var(--accent);
}

/* --------------------------------------------------------------------------
   09. Seating Chart Maker (Classroom Floorplan)
   -------------------------------------------------------------------------- */
.classroom-front {
    text-align: center;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    padding: 7.5px;
    border: 1px solid var(--border-strong);
    border-radius: 4px;
    background: var(--bg-muted);
    margin-bottom: 13.5px;
}

.seating-grid {
    display: grid;
    gap: 8.5px;
}

.seat-desk {
    min-height: 66px;
    padding: 6.5px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xs);
    background: var(--bg-elevated);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    font-size: 13.5px;
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    transition: border-color 0.14s ease, background 0.14s ease;
}

.seat-desk:hover {
    border-color: var(--border-strong);
}

.seat-desk.is-aisle {
    border-style: dashed;
    background: transparent;
    opacity: 0.35;
}

.seat-desk.is-selected {
    border-color: var(--accent);
    background: var(--accent-soft);
}

.seat-coord {
    font-family: var(--font-mono);
    font-size: 10.5px;
    color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   10. Reaction Time Test (Full-Width Signal Arena)
   -------------------------------------------------------------------------- */
.reaction-arena {
    min-height: 275px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-subtle);
    background: var(--bg-surface);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 29px;
    cursor: pointer;
    user-select: none;
    transition: background-color 0.08s ease, border-color 0.08s ease;
    margin-bottom: 15.5px;
}

.reaction-arena[data-state="armed"] {
    background: #9E1C1C;
    border-color: #9E1C1C;
    color: #FFFFFF;
}

.reaction-arena[data-state="go"] {
    background: #0F8A5F;
    border-color: #0F8A5F;
    color: #FFFFFF;
}

.reaction-arena[data-state="early"] {
    background: var(--warning-soft);
    border-color: var(--warning);
}

.reaction-big {
    font-family: var(--font-display);
    font-size: clamp(31px, 5vw, 49px);
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* --------------------------------------------------------------------------
   11. Online Metronome (Hardware Drum-Machine LED Strip)
   -------------------------------------------------------------------------- */
.metro-dial-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 17.5px;
    flex-wrap: wrap;
}

.metro-bpm-big {
    font-family: var(--font-mono);
    font-size: 61px;
    font-weight: 700;
    line-height: 1;
    letter-spacing: -0.04em;
}

.metro-leds {
    display: flex;
    gap: 8.5px;
    margin: 19.5px 0;
}

.metro-led {
    flex: 1;
    height: 51px;
    border-radius: var(--radius-xs);
    border: 1px solid var(--border-subtle);
    background: var(--bg-elevated);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 12px;
    cursor: pointer;
    transition: transform 0.06s ease, background 0.06s ease;
}

.metro-led[data-level="2"] {
    border-top: 3px solid var(--accent);
}

.metro-led[data-level="0"] {
    opacity: 0.4;
}

.metro-led.is-lit {
    background: var(--accent);
    border-color: var(--accent);
    color: #FFFFFF;
    transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   12. Dice Roller (Polyhedral Tray)
   -------------------------------------------------------------------------- */
.dice-tray {
    min-height: 187px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 19.5px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 15.5px;
    margin: 15.5px 0;
}

.die-token {
    width: 79px;
    height: 79px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: die-pop 0.22s ease;
}

.die-token svg {
    width: 100%;
    height: 100%;
    color: var(--bg-surface);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.14));
}

.die-val {
    position: absolute;
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 19.5px;
    color: var(--text-primary);
}

.die-type-tag {
    position: absolute;
    bottom: -14px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
}

@keyframes die-pop {
    0% { transform: scale(0.75) rotate(-18deg); opacity: 0.4; }
    100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

/* --------------------------------------------------------------------------
   13. Flip a Coin (3D Metallic Stage + Ratio Bar)
   -------------------------------------------------------------------------- */
.coin-stage {
    perspective: 990px;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 27px 17.5px;
}

.coin-disc {
    width: 141px;
    height: 141px;
    border-radius: 50%;
    border: 4px solid var(--border-strong);
    background: linear-gradient(145deg, var(--bg-surface), var(--bg-muted));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    transition: transform 0.55s cubic-bezier(0.22, 1, 0.36, 1);
}

.coin-disc.is-flipping {
    animation: coin-spin 0.55s ease-out;
}

@keyframes coin-spin {
    0% { transform: rotateY(0deg) scale(1); }
    50% { transform: rotateY(540deg) scale(1.14); }
    100% { transform: rotateY(1080deg) scale(1); }
}

.ratio-bar {
    height: 11px;
    border-radius: 999px;
    background: var(--bg-muted);
    overflow: hidden;
    display: flex;
}

.ratio-fill-a { background: var(--accent); transition: width 0.25s ease; }
.ratio-fill-b { background: var(--cobalt); transition: width 0.25s ease; }

/* --------------------------------------------------------------------------
   14. Virtual Scoreboard (Modular Team Cards)
   -------------------------------------------------------------------------- */
.score-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(209px, 1fr));
    gap: 13.5px;
}

.team-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-top: 4px solid var(--team-color, var(--accent));
    border-radius: var(--radius-sm);
    padding: 15.5px;
    text-align: center;
}

.team-score-num {
    font-family: var(--font-mono);
    font-size: 59px;
    font-weight: 700;
    line-height: 1.05;
    margin: 11px 0;
}

/* --------------------------------------------------------------------------
   15. Noise Level Meter (SVG Arc + Spectrum)
   -------------------------------------------------------------------------- */
.noise-gauge-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 11px 0;
}

.noise-spectrum {
    width: 100%;
    height: 101px;
    display: block;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xs);
}

/* --------------------------------------------------------------------------
   16. Online Whiteboard
   -------------------------------------------------------------------------- */
.wb-shell {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.wb-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8.5px;
    padding: 11px 13.5px;
    border-bottom: 1px solid var(--border-subtle);
    background: var(--bg-elevated);
}

.wb-canvas-wrap {
    position: relative;
    width: 100%;
    height: 484px;
    background: #FFFFFF;
}

.wb-canvas {
    width: 100%;
    height: 100%;
    display: block;
    touch-action: none;
    cursor: crosshair;
}

.color-dot {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    border: 2px solid transparent;
    padding: 0;
}

.color-dot.is-active {
    border-color: var(--text-primary);
    transform: scale(1.12);
}

/* --------------------------------------------------------------------------
   17-22. Time Tools (Pace, Sleep, Pomodoro, Stopwatch, Countdown, Classroom)
   -------------------------------------------------------------------------- */
.timer-cockpit {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 27px 19.5px;
    text-align: center;
}

.timer-digits-xl {
    font-family: var(--font-mono);
    font-size: clamp(49px, 9vw, 83px);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.ring-wrap {
    position: relative;
    width: 247px;
    height: 247px;
    margin: 15.5px auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ring-svg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.ring-track {
    fill: none;
    stroke: var(--bg-muted);
    stroke-width: 7;
}

.ring-progress {
    fill: none;
    stroke: var(--accent);
    stroke-width: 7;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.25s linear;
}

.sleep-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 11px;
}

.sleep-card {
    padding: 14.5px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
}

.sleep-card.is-optimal {
    border-color: var(--success);
    background: var(--success-soft);
}

.split-table-wrap {
    max-height: 330px;
    overflow-y: auto;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xs);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-mono);
    font-size: 14px;
}

.data-table th,
.data-table td {
    padding: 8.5px 11px;
    border-bottom: 1px solid var(--border-subtle);
    text-align: left;
}

.data-table th {
    font-size: 11.5px;
    text-transform: uppercase;
    color: var(--text-muted);
    background: var(--bg-elevated);
    position: sticky;
    top: 0;
}

.classroom-bar-track {
    height: 29px;
    border-radius: var(--radius-xs);
    background: var(--bg-muted);
    border: 1px solid var(--border-subtle);
    overflow: hidden;
    margin: 19.5px 0;
}

.classroom-bar-fill {
    height: 100%;
    width: 100%;
    background: var(--success);
    transition: width 0.25s linear, background-color 0.3s ease;
}

/* ==========================================================================
   Responsive Adjustments for Narrow Mobile Screens
   ========================================================================== */

@media (max-width: 780px) {
    .split-workbench,
    .wheel-layout,
    .bingo-top {
        grid-template-columns: 1fr;
    }

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

    .swatch-block {
        height: 121px;
    }

    .prompt-deck,
    .sleep-cards,
    .grid-3 {
        grid-template-columns: 1fr;
    }

    .rng-stats-strip {
        grid-template-columns: repeat(2, 1fr);
    }

    .bingo-board-75 {
        grid-template-columns: 24px repeat(15, 1fr);
        gap: 2px;
    }

    .bingo-cell {
        font-size: 10.5px;
    }
}

@media (max-width: 500px) {
    .grid-2 {
        grid-template-columns: 1fr;
    }

    .palette-columns {
        grid-template-columns: 1fr;
    }

    .wb-canvas-wrap {
        height: 374px;
    }
}