/* Rungs — daily word ladder (E4). Uses main.css :root tokens; dark theme
   inherits automatically because every color is a token or derived from one. */

.rungs-layout {
    max-width: 44rem;
    margin: 0 auto;
    padding: 0 1rem 3rem;
}

.rungs-summary__meta {
    color: var(--color-text-muted);
    font-size: var(--fs-4);
    margin-bottom: 0.25rem;
}

.rungs-summary__task {
    font-size: var(--fs-3);
}

.rungs-word {
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.rungs-noscript,
.rungs-unavailable {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    margin: 1rem 0;
}

.rungs-board {
    list-style: none;
    padding: 0;
    margin: 1.25rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.rungs-row__tiles {
    display: inline-flex;
    gap: 0.25rem;
}

.rungs-tile {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    border: 2px solid var(--color-border-strong);
    border-radius: 6px;
    background: var(--bg-surface);
    color: var(--color-text);
    font-family: var(--font-mono);
    font-size: 1.125rem;
    font-weight: 700;
    text-transform: uppercase;
}

.rungs-tile--changed {
    border-color: var(--color-accent);
    background: var(--color-accent);
    color: #ffffff;
}

.rungs-row--start .rungs-tile {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: #ffffff;
}

.rungs-row--target .rungs-tile {
    border-style: dashed;
    color: var(--color-text-secondary);
}

.rungs-row--error {
    color: var(--color-text-secondary);
}

.rungs-form__label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.rungs-form__row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}

.rungs-input {
    max-width: 12rem;
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.rungs-message {
    min-height: 1.5rem;
    margin-top: 0.5rem;
    color: var(--color-accent-dark);
}

.rungs-hints,
.rungs-result,
.rungs-stats,
.rungs-howto,
.rungs-archive {
    margin-top: 2rem;
}

.rungs-hints__intro,
.rungs-stats__note {
    color: var(--color-text-secondary);
    font-size: var(--fs-4);
}

.rungs-hint-list {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.rungs-hint {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 0.5rem 0.75rem;
    background: var(--bg-surface);
}

.rungs-hint__label {
    font-weight: 700;
    font-size: var(--fs-4);
}

.rungs-hint__part {
    font-size: var(--fs-4);
}

.rungs-result {
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-accent);
    border-radius: 8px;
    padding: 1rem;
    background: var(--bg-surface);
}

.rungs-stats__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr));
    gap: 0.5rem;
    margin: 0.75rem 0 0;
}

.rungs-stat {
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 0.5rem 0.75rem;
    background: var(--bg-surface);
}

.rungs-stat dt {
    font-size: var(--fs-5);
    color: var(--color-text-secondary);
}

.rungs-stat dd {
    margin: 0;
    font-size: var(--fs-2);
    font-weight: 700;
}

.rungs-provenance {
    color: var(--color-text-muted);
    font-size: var(--fs-4);
    margin-top: 0.75rem;
}

.rungs-archive__list {
    list-style: none;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
}

.rungs-archive__list .link-button {
    display: inline-flex;
    align-items: center;
    min-height: 2.75rem;
    padding: 0.35rem 0.5rem;
}

@media (prefers-reduced-motion: no-preference) {
    .rungs-tile {
        transition: background-color 120ms ease, border-color 120ms ease;
    }
}