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

:root {
    /* Board sizing */
    --board-min: 400px;
    --board-max: 720px;
  
    /* Clue sizing */
    --clue-min-width: 400px;
    --clue-max-width: 440px;
    --clue-min-height: 320px;
    --clue-max-height: 760px;

    /* Site sizing */
    --site-max-width: 1440px;
    --clue-text: 55ch;

    /* Reserve space so panel doesn't collapse before puzzle initializes */
    --puzzle-dynamic-loading-min-height: 1200px;
  }

html {
    font-family: system-ui, "Segoe UI", Roboto, sans-serif;
    overflow-y: scroll;
}

body {
    display: flex;
    flex-direction: column;
    margin: 0;
    min-height: 100vh;
    min-height: 100dvh;
    background: whitesmoke;
}

main {
    max-width: var(--site-max-width);
    margin: 0 auto;
    padding: 0 1rem;
    flex: 1;
}

[hidden] {
    display: none !important;
}

.puzzle-dynamic {
    visibility: hidden;
    min-height: var(--puzzle-dynamic-loading-min-height);
}

.puzzle-dynamic.is-ready {
    /* Reserve space so panel doesn't collapse before puzzle initializes */
    visibility: visible;
    min-height: auto;
}

.puzzle-region {
    display: flex;
    justify-content: center;
    width: 100%;
    flex-direction: column;
}

.toolbar-wrapper {
    display: flex;
    flex-direction: column;
}

.puzzle-toolbar {
    display: inline-flex;
    align-items: center;
    letter-spacing: 0em;
    color: #6b7280;

    user-select: none;
    -webkit-user-select: none;
    touch-action: manipulation;
}

.toolbar-separator {
    margin: 0 0.4rem;
    color: #9ca3af;
    pointer-events: none;
}

.puzzle-toolbar button {
    background: none;
    border: none;
    padding: 0.3rem 0.2rem;
    font: inherit;
    cursor: pointer;
}

.puzzle-toolbar button:hover {
    text-decoration: underline;
}

.puzzle-toolbar .controls-toggle::before {
    content: "\25B6";
    margin-right: 0.1rem;
}
  
.puzzle-toolbar .controls-toggle[aria-expanded="true"]::before {
    content: "\25BC";
}

.puzzle-toolbar .controls-toggle {
    color: #374151;
}

.puzzle-toolbar .clear-puzzle {
    color: #6b7280;
}

.puzzle-toolbar .clear-puzzle.confirming {
    color: #374151
}

.controls-mobile {
  display: none;
}

.controls-panel {
    width: 100%;
    margin-bottom: 0.5rem;
    font-size: clamp(0.9rem, 1vw, 1rem);
    line-height: 1.4;
    color: #4b5563;
}

.controls-desktop {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
}

.controls-desktop section {
    min-width: 0;
}

.controls-desktop h3 {
    margin: 0 0 2px 0;
    font-size: 1rem;
    font-weight: 600;
}

.controls-desktop ul {
    margin: 0;
    padding-left: 1.25rem;
}

.controls-desktop li + li {
    margin-top: 0.3rem;
}

.controls-mobile ul {
    margin: 0;
}

.controls-mobile li + li {
    margin-top: 0.3rem;
}

.board-title {
    text-align: center;
    font-size: clamp(1.4rem, 2.2vw, 2rem);
    margin-top: 0;
    margin-bottom: clamp(0.5rem, 0.8vw, 0.9rem);
    font-weight: 600;
}

.puzzle-panel {
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.board-layout {
    width: clamp(var(--board-min), 50vw, var(--board-max));
    max-width: 100%;
    min-width: var(--board-min);
    flex: 0 0 auto;
    order: 1;
}

.board-card {
    table-layout: fixed;
    width: 100%;

    border-radius: 20px;
    box-shadow:
        0 1px 2px rgba(0,0,0,0.04),
        0 8px 24px rgba(0,0,0,0.06);

    border-collapse: collapse;
    touch-action: manipulation;
    contain: layout style paint;
}


.cell {
    border: 2px solid #18181b;
    background: white;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
    transition: background-color 120ms ease, box-shadow 120ms ease;
}

.cell.block {
    background: #18181b;
    border-color: #18181b;
    box-shadow: inset 0 0 0 clamp(2px, 0.5vw, 4px) #111;
}

.cell.highlight-placement {
    background: #c9d0e6;
}

.cell.highlight-cursor {
    background: #b1b9db;
    box-shadow: inset 0 0 0 2px #6A6D8F;
}

.cell .fill {
    position: relative;
    width: 100%;
    font-size: clamp(12px, 1vw, 20px);
    aspect-ratio: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.fill .label {
    position: absolute;
    top: 2px;
    left: 2px;
    pointer-events: none;

    font-size: clamp(11px, 0.5rem + 0.35vw, 15px);
    line-height: 1;
    color: #374151;
    font-weight: 600;
}

.fill .letter {
    width: 100%;
    height: 100%;
    border: none;
    padding: 0;

    text-align: center;
    font-size: clamp(16px, 0.9rem + 0.45vw, 22px);
    font-weight: 600;
    line-height: 1;
    text-transform: uppercase;

    background: transparent;
    caret-color: transparent;

    appearance: none;
    
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: transparent;
}

.fill .letter:focus {
    outline: none;
}

.fill .letter::selection {
    background: transparent;
}

.mobile-nav {
    display: none;
    order: 3;
}

.clue-wrapper {
    background: #f3f3f3;
    border-radius: 20px;
    border: 1px solid rgba(0,0,0,0.04);
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.02);
    order: 2;

    flex-shrink: 0;
    width: min(45vw, var(--clue-max-width));
    min-width: var(--clue-min-width);
    height: min(clamp(60vh, calc(24vh + 32vw), 80vh), var(--clue-max-height));
    min-height: var(--clue-min-height);
}

.clue-card {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;

    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-y: auto;
    scrollbar-gutter: stable;

    touch-action: pan-y;

    padding: 14px 10px;
    line-height: 1.4;
}

.todo-wrapper {
    order: 1;
}

.solved-wrapper {
    order: 2;
}

.clue-card :is(h2, h3) {
    margin: 0;
    padding: 0;
}

.clue-card.show-empty .clue-empty {
    display: block;
}

.clue-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;

    font: inherit;
    color: inherit;
    cursor: pointer;
    background: none;
    border: none;

    user-select: none;
    -webkit-user-select: none;

    padding: 0;
    margin: 0;
}

.clue-toggle .clue-label.clue-across::before,
.clue-toggle .clue-label.clue-down::before {
    display: inline-block;
    width: 1ch;
    margin-right: .5rem;
}

.clue-toggle .clue-label.clue-across::before {
    content: "\2192";
}

.clue-toggle .clue-label.clue-down::before {
    content: "\2193";
}

.clue-count {
    color: #555;
    font-weight: 500;
    font-variant-numeric: tabular-nums;
}

.clue-list:not([hidden]) {
    list-style: none;
    padding: 0;
    margin: 0.5rem 0 0 0;
}

.clue-card h2 + .clue-section-body {
    margin-top: .5rem;
}

/* remove empty clue-list */
.clue-list:empty {
    display: none;
}

/* vertical spacing between clues */
.clue + .clue {
    margin-top: .3rem;
}
  
.clue {
    margin: 0;
    padding: 2px 4px;
    border-radius: 4px;
    list-style: none;

    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;

    display: grid;
    grid-template-columns: 2ch minmax(0,1fr) 20px;
    gap: 0;
    width: 100%;
    align-items: start;

    cursor: pointer;
    transition: background-color 120ms ease;
}

.clue:hover {
    background: #e0e4f1;
}

.clue:active {
    background: #b6bddc;
}

.clue.active {
    background: #c9d0e6;
}

.clue-label {
    text-align: right;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.clue-content {
    min-width: 0;
    margin-left: 0.5rem;
}

.clue-text {
    max-width: var(--clue-text);
    overflow-wrap: break-word;
    text-wrap: pretty;
}

.clue-meta {
    white-space: nowrap;
}

.clue-show-answer {
    visibility: hidden;
    pointer-events: none;
    color: #6b7280;
    font-size: 0.9em;
    touch-action: manipulation;
}

.clue-show-answer::before {
    content: "\A";
    white-space: pre;
}

/* Hover that changes interaction causes double click on mobile */
@media (hover: hover) {
    .clue:hover .clue-show-answer {
        visibility: visible;
        pointer-events: auto;
        cursor: pointer;
    }
}

.clue.active .clue-show-answer {
    visibility: visible;
    pointer-events: auto;
    cursor: pointer;
}

.clue-show-answer:hover {
    color: #374151;
}

/* prepend non-breakable space */
.clue-length-label::before {
    content: "\00A0";
}

.clue-length-label {
    color: #6b7280;
    font-size: 0.90em;
}

.clue-copy {
    appearance: none;
    -webkit-appearance: none;

    background: none;
    border: none;
    padding: 0;

    width: 16px;
    height: 16px;

    position: relative;
    cursor: pointer;

    touch-action: manipulation;
}

.clue-copy::before {
    content: "";
    position: absolute;
    inset: -8px;
}

.copy-icon,
.check-icon {
    width: 16px;
    height: 16px;
    display: block;
}

.check-icon {
    transform: scale(1.3);
}

.clue-copy .check-icon {
    display: none;
}

.clue-copy.copied .check-icon {
    display: block;
}

.clue-copy.copied .copy-icon {
    display: none;
}

.clue-empty {
    display: none;
    text-align: center;
    padding: 24px 12px;
    color: #777;
    order: 3;
}

/* Hide clue-count from UX when expanded */
.section-toggle[aria-expanded="true"] .clue-count {
    display: none;
}

.post-puzzle {
    margin-top: 2rem;
}

.puzzle-metadata {
    font-size: 0.9rem;
    color: #6b7280;
    margin-bottom: .4rem;
}

/* remove empty items */
.puzzle-metadata .meta-line > :empty {
    display: none;
}

/* add separator between remaining items */
.puzzle-metadata .meta-line > :not(button) + :not(button)::before {
    content: "\00A0\2022\00A0";
}

.puzzle-metadata p {
    margin: 0;
}

.puzzle-url-copy-button {
    margin-left: .4rem;
    opacity: 0.55;
    transform: translateY(2px);
}

.puzzle-url-copy-button:hover {
    opacity: 0.9;
}

p.board-desc {
    margin: 0;
}

.board-desc {
    max-width: 60ch;
    line-height: 1.6;
    color: #4b5563;
    overflow-wrap: break-word;
    text-wrap: pretty;
}

.puzzle-link-section {
    margin: 1.5rem 0 0;
}

.puzzle-link-section p {
    margin: 0;
}

.next-puzzle-link {
    word-break: break-word;
}

.next-puzzle-link a {
    color: black;
    font-weight: 600;
    text-decoration: none;
}

.next-puzzle-link + .design-note-link {
    margin-top: 0.4rem;
}

.design-note-link {
    white-space: nowrap;
}

.design-note-link a {
    color: #4b5563;
    font-weight: 500;
    text-decoration: none;
}
  
.design-note-link a:hover {
    color: #1f2937;
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}

.solution-panel {
    width: clamp(320px, 28vw, 460px);
    max-width: 100%;
    margin-top: 0.5rem;
}
  
.solution-toggle {
    cursor: pointer;
    font-weight: 600;
    padding: 4px 0;
    border-radius: 8px;
}

.solution-toggle:hover {
    background: #f2f2f2;
}

.solution-json {
    background: #1e1e1e;
    color: #ce9178;
    padding: 1rem;
    margin-top: 0.5rem;
    border-radius: 8px;
    overflow-x: auto;
    font-family: ui-monospace, monospace;
    font-size: 0.85rem;
    line-height: 1.4;
    border: 1px solid #2d2d2d;;
}

@keyframes success-pulse {
    0% {
        background-color: var(--cell-bg);
        transform: translateY(0);
    }
    30% {
        background-color: #dbe3ff;
        transform: translateY(-1px);
    }
    70% {
        background-color: #dbe3ff;
        transform: translateY(-1px);
    }
    100% {
        background-color: var(--cell-bg);
        transform: translateY(0);
    }
}
.placement-success {
    transform-origin: center;
    animation: success-pulse 300ms ease-out;
}

@keyframes error-shake {
    0%   { transform: translateX(0); }
    20%  { transform: translateX(-3px); }
    40%  { transform: translateX(3px); }
    60%  { transform: translateX(-3px); }
    80%  { transform: translateX(2px); }
    100% { transform: translateX(0); }
}
.placement-error {
    transform-origin: center;
    animation: error-shake 240ms ease-out;
}

@keyframes direction-reject {
    0% {
        background-color: transparent;
    }
    30% {
        background-color: rgba(125, 137, 187, 0.5);
    }
    70% {
        background-color: rgba(125, 137, 187, 0.5);
    }
    100% {
        background-color: transparent;
    }
}

.direction-reject {
    animation: direction-reject 200ms ease-out;
}

/* Large desktop */
@media (min-width: 1800px) {
    :root {
      --board-max: 780px;
      --clue-max-height: 800px;
    }
}

/* Tablet / Mobile */
@media (max-width: 900px) {
    :root {
        --clue-max-width: 600px;
        --puzzle-dynamic-loading-min-height: 1800px;
    }

    .toolbar-wrapper {
        align-items: center;
    }

    .puzzle-panel {
      flex-direction: column;
      align-items: center;
    }

    .board-layout {
        width: clamp(var(--board-min), 90vw, var(--board-max));
    }

    .clue-wrapper {
        margin-top: 0;
        width: min(90vw, var(--clue-max-width));
        height: 50vh;
        order: 1;
    }

    .board-layout {
        order: 2;
    }

    .mobile-nav {
        display: flex;
        gap: 12px;
    }

    .mobile-nav button {
        appearance: none;
        border: 0;
        background: transparent;
        color: inherit;
        font: inherit;
        font-size: clamp(1.2rem, 1rem + 0.6vw, 1.4rem);

        padding: 4px 6px;
        cursor: pointer;
        touch-action: manipulation;
    }

    .mobile-nav button:active {
        opacity: 0.6;
    }

    .solved-wrapper {
        order: 1;
    }

    .todo-wrapper {
        order: 2;
    }

    .instructions-desktop,
    .controls-desktop {
      display: none;
    }

    .controls-mobile {
      display: block;
    }
}