/* Shared visual styles used by index.html, puzzle.html, and media.html.
   Page-specific rules (rules table, ruleset picker, difficulty filter,
   etc.) stay inline in their owning page. */

:root {
    --bg-page: #faf7f0;
    --bg-chip: #f0e8d8;
    --bg-chip-hover: #e6dcc0;
    --bg-chip-soft: rgba(255, 255, 255, 0.4);
    --bg-empty: #f5ecd6;
    --border: #c8b89a;
    --border-strong: #b8a778;
    --border-soft: #e5dcc4;
    --text: #3a2e1a;
    --text-dim: #5a4a2a;
    --text-muted: #7a6a4a;
    --ok: #2e7d32;
    --err: #c62828;
}

body {
    background: var(--bg-page);
    color: var(--text);
    max-width: 50em;
    margin: 0 auto;
    padding: 2em;
}

ul { list-style: none; padding-left: 1em; }

li[data-equation] {
    cursor: pointer;
    width: fit-content;
    max-width: 100%;
    padding: 2px 6px;
    margin-bottom: 4px;
    border: 1px solid var(--border-soft);
    border-radius: 4px;
    background: var(--bg-chip-soft);
}
li[data-equation]:hover { background: var(--bg-chip); border-color: var(--border); }

#preview { margin: 0.6em 0 1em; min-height: 80px; }
#validity {
    font-family: sans-serif;
    font-size: 1.2em;
    margin-left: 0.5em;
    opacity: 0.7;
}

/* "Reveal" link inside the Found N solutions paragraph. */
#status details { display: inline; }
#status details > summary {
    cursor: pointer; display: inline;
    color: var(--text-dim);
    text-decoration: underline;
    list-style: none;
}
#status details > summary::-webkit-details-marker { display: none; }
#status details > summary:hover { color: var(--text); }

/* Inline clickable equations in descriptive text. */
.eq-link {
    font-family: monospace;
    color: var(--text-dim);
    cursor: pointer;
    border-bottom: 1px dashed var(--border-strong);
}
.eq-link:hover { background: var(--bg-chip); color: var(--text); }

/* Rules table — shared between index.html and puzzle.html. */
table { border-collapse: collapse; margin-top: 0.5em; }
th, td { border: 1px solid var(--border); padding: 0; text-align: center; vertical-align: middle; }
tbody th, tbody td { line-height: 0; }
thead th { background: var(--bg-chip); padding: 4px 8px; line-height: normal; }
.char-cell { display: flex; flex-wrap: wrap; gap: 0; justify-content: center; align-items: center; }
.empty-slot {
  font-family: sans-serif; font-size: 0.8em; color: var(--text-muted);
  padding: 0.15em 0.5em; line-height: normal;
  border: 1px dashed var(--border-strong); border-radius: 4px;
  background: var(--bg-empty);
}
tbody svg { max-width: 100%; height: auto; }
@media (max-width: 600px) {
  tbody svg { width: auto; height: 44px; }
}

/* The little "open in new tab" arrow appended to each sample link. */
.sample-open {
    font-family: sans-serif; font-size: 0.85em;
    color: var(--border-strong); text-decoration: none;
    padding: 0 0.4em; margin-left: 0.3em;
    vertical-align: super;
}
.sample-open:hover { color: var(--text-dim); }

/* Shared outlined-pill: buttons, picker links, journey-nav buttons, etc.
   Caller picks the element (button/a/label); this class supplies the look. */
.chip {
    font-family: sans-serif; font-size: 1em;
    padding: 0.3em 1em;
    border: 1px solid var(--border); border-radius: 4px;
    background: var(--bg-chip); color: var(--text-dim);
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}
.chip:hover:not(:disabled) { background: var(--bg-chip-hover); }
.chip:disabled { opacity: 0.5; cursor: default; }
.chip.active { border-color: var(--border-strong); font-weight: bold; }
.chip[hidden] { display: none; }

/* Softer variant used by the difficulty filter and sample picker. */
.chip-soft {
    font-family: sans-serif; font-size: 0.95em;
    padding: 0.2em 0.7em;
    border: 1px solid var(--border); border-radius: 4px;
    background: var(--bg-chip-soft);
    color: var(--text-dim);
    cursor: pointer;
    user-select: none;
    text-decoration: none;
    display: inline-block;
}
.chip-soft:hover { background: var(--bg-chip); }
.chip-soft.active,
.chip-soft:has(input:checked) {
    background: var(--bg-chip); border-color: var(--border-strong);
}