/* Acid matching activity. Theme variables come from the acids lesson. */
.acid-match { --match-success: var(--acids-success); --match-error: var(--acids-error); --match-tint: rgba(238, 172, 96, .075); line-height: 1.5; scroll-margin-top: calc(var(--site-top-height, 64px) + 24px); }
:root[data-theme="light"] .acid-match { --match-tint: rgba(148, 80, 24, .055); }
.acid-match button { touch-action: manipulation; }
.acid-match :focus-visible { outline: 3px solid var(--color-accent); outline-offset: 4px; }
.acid-match-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 25px; }
.acid-match .acid-match-eyebrow { margin: 0 0 9px; color: var(--color-accent); font-size: 11px; font-weight: 700; letter-spacing: .15em; }
.acid-match-heading h2 { margin: 0; font-size: clamp(27px, 2.7vw, 34px); line-height: 1.2; letter-spacing: -.025em; }
.acid-match-intro { margin: 12px 0 0; color: var(--color-text-muted); font-size: 14px; }
.acid-match-count { flex-shrink: 0; padding: 7px 12px; border: 1px solid var(--color-border); border-radius: 30px; color: var(--color-text-muted); font-size: 12px; }
.acid-match-count span { margin: 0 5px; color: var(--color-accent); }
.acid-match-bank-panel { margin-bottom: 27px; padding: 18px 20px 20px; border: 1px solid var(--color-border); border-radius: 12px; background: var(--color-bg-panel); }
.acid-match-step { display: flex; align-items: center; gap: 9px; }
.acid-match-step > span { display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0; width: 23px; height: 23px; border: 1px solid var(--color-border); border-radius: 50%; color: var(--color-accent); font-size: 11px; font-weight: 700; }
.acid-match-step h3 { margin: 0; font-size: 13px; font-weight: 700; }
.acid-match-step small { margin-left: auto; color: var(--color-text-muted); font-size: 11px; }
.acid-match-bank { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 11px; margin-top: 14px; }
.acid-match .acid-match-choice { position: relative; display: flex; align-items: center; justify-content: center; gap: 10px; min-height: 76px; padding: 12px 14px; border: 1px solid var(--color-border); border-radius: 8px; background: var(--color-bg-card); color: var(--color-text); cursor: grab; font-size: 14px; font-weight: 700; touch-action: none !important; user-select: none; -webkit-user-select: none; }
.acid-match-choice-copy { display: flex; flex-direction: column; gap: 4px; min-width: 0; text-align: left; }
.acid-match-choice-icon { display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0; width: 20px; height: 24px; color: var(--color-accent); font-size: 22px; font-weight: 400; }
.acid-match-choice:hover { border-color: var(--color-accent); }
.acid-match-choice[aria-pressed="true"] { border-color: var(--color-accent); outline: 1px solid var(--color-accent); outline-offset: 0; background: var(--match-tint); }
.acid-match-choice.is-dragging { opacity: .45; cursor: grabbing; }
.acid-match-choice.is-used { border-style: dashed; background: transparent; cursor: default; opacity: .65; }
.acid-match-choice.is-used .acid-match-choice-icon { color: var(--match-success); font-size: 16px; }
.acid-match-image-heading { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px 20px; margin-bottom: 14px; }
.acid-match-image-heading p { margin: 0; color: var(--color-text-muted); font-size: 12px; }
.acid-match-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); align-items: start; gap: 14px; }
.acid-match-card { position: relative; display: flex; flex-direction: column; align-items: stretch; min-width: 0; margin: 0; padding: 17px; border: 1px solid var(--color-border); border-radius: 12px; background: var(--color-bg-panel); }
.acid-match-card.is-ready { border-color: var(--color-accent); }
.acid-match-card.is-correct { border-color: var(--match-success); }
.acid-match-card.is-incorrect { border-color: var(--match-error); }
.acid-match-card.is-drag-over { border-color: var(--color-accent); outline: 2px solid var(--color-accent); outline-offset: 2px; background: var(--match-tint); }
.acid-match-letter { display: inline-flex; align-items: center; justify-content: center; width: 27px; height: 27px; border: 1px solid var(--color-border); border-radius: 7px; color: var(--color-text-muted); font-size: 12px; font-weight: 700; }
.acid-match-art { display: block; width: 100%; height: 155px; margin: 2px 0 10px; object-fit: contain; color-scheme: inherit; }
.acid-match-hint { color: var(--color-accent); font-size: 11px; font-weight: 400; line-height: 1.4; }
.acid-match-slot { display: flex; align-items: center; justify-content: center; gap: 8px; width: 100%; min-height: 48px; padding: 10px 8px; border: 1px dashed var(--color-border); border-radius: 7px; background: var(--color-bg-dark); color: var(--color-text-muted); font-size: 13px; text-align: center; }
.acid-match-slot > span:first-child { flex: 1; }
.acid-match-card.is-ready .acid-match-slot { border-color: var(--color-accent); background: var(--match-tint); color: var(--color-accent); }
.acid-match-slot.is-filled { border-style: solid; border-color: var(--color-accent); color: var(--color-accent); font-weight: 700; }
.acid-match-slot-symbol { color: var(--color-accent); font-size: 16px; font-weight: 400; }
.acid-match-card.is-correct .acid-match-slot { border-color: var(--match-success); color: var(--match-success); }
.acid-match-card.is-incorrect .acid-match-slot { border-color: var(--match-error); color: var(--match-error); }
.acid-match-card-state { margin-top: 9px; text-align: center; font-size: 11px; font-weight: 700; }
.acid-match-card.is-correct .acid-match-card-state { color: var(--match-success); }
.acid-match-card.is-incorrect .acid-match-card-state { color: var(--match-error); }
.acid-match-description { margin-top: 14px; padding-top: 13px; border-top: 1px solid var(--color-border); }
.acid-match-description .acid-match-card-state { display: block; margin-top: 0; text-align: left; }
.acid-match-description p { margin: 7px 0 0; color: var(--color-text-muted); font-size: 13px; line-height: 1.65; }
.acid-match-drag-ghost { position: fixed; z-index: 10000; max-width: calc(100vw - 16px); padding: 12px 18px; border: 2px solid var(--color-accent); border-radius: 9px; background: var(--color-bg-card); color: var(--color-text); box-shadow: 0 8px 25px #0003; pointer-events: none; font-size: 14px; font-weight: 700; }
.acid-match-sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.acid-match-footer { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-top: 22px; }
.acid-match-progress-wrap { display: flex; align-items: center; gap: 13px; }
#acidMatchingProgress { color: var(--color-text-muted); font-size: 12px; }
.acid-match-progress { display: flex; gap: 4px; }
.acid-match-progress i { width: 20px; height: 4px; border-radius: 4px; background: var(--color-border); }
.acid-match-progress i.is-filled { background: var(--color-accent); }
.acid-match-actions { display: flex; align-items: center; gap: 18px; }
.acid-match-actions button { min-height: 44px; font-size: 13px; cursor: pointer; }
.acid-match-reset { padding: 9px 0; border: 0; background: transparent; color: var(--color-text-muted); }
.acid-match-reset > span { display: inline-block; margin-right: 5px; font-size: 18px; vertical-align: -1px; }
.acid-match-reset:hover { color: var(--color-accent); }
.acid-match .acid-match-feedback { margin: 18px 0 0; padding: 14px 18px; border: 1px solid var(--color-border); border-left: 3px solid var(--match-error); border-radius: 7px; background: var(--color-bg-panel); color: var(--color-text); font-size: 13px; }
.acid-match-feedback.is-correct { border-left-color: var(--match-success); }

@media (max-width: 1000px) {
    .acid-match-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .acid-match-bank { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .acid-match-art { height: 160px; }
}
@media (max-width: 560px) {
    .acid-match-heading { align-items: flex-start; margin-bottom: 20px; }
    .acid-match-count { display: none; }
    .acid-match-intro { font-size: 13px; }
    .acid-match-bank-panel { padding: 15px 12px; margin-bottom: 21px; }
    .acid-match-step small { display: none; }
    .acid-match-bank { gap: 8px; }
    .acid-match .acid-match-choice { gap: 6px; padding: 10px 6px; font-size: 12px; }
    .acid-match-grid { gap: 10px; }
    .acid-match-card { padding: 11px; }
    .acid-match-art { height: 110px; margin: 2px 0 8px; }
    .acid-match-hint { font-size: 10px; }
    .acid-match-slot { min-height: 49px; font-size: 11px; }
    .acid-match-description p { font-size: 12px; }
    .acid-match-footer { flex-direction: column; align-items: stretch; gap: 15px; }
    .acid-match-progress-wrap { justify-content: center; }
    .acid-match-actions { justify-content: space-between; gap: 10px; }
}
@media (max-width: 350px) {
    .acid-match-grid { grid-template-columns: 1fr; }
    .acid-match-art { height: 150px; }
    .acid-match-choice-icon { width: 16px; }
}