/* public/css/memory-pairs.css — public-facing Memory Pairs styling.
 *
 * Card-flip solver with 3D CSS transforms. The back face is the "face-
 * down" card (colored tile with a question mark); the front face carries
 * the pair text. .mp-mcard.is-flipped rotates to show the front.
 *
 * Dark-theme aware via the existing CSS vars. Print CSS hides the
 * interactive bits and shows the plain answers/pair list instead.
 */

.mp-solver { margin: 16px 0; }

/* ===== Controls (moves + timer + progress + actions) ===================== */

.mp-solver-controls {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 10px 14px;
    background: var(--background-alt, #f9fafb);
    border: 1px solid var(--border-color, #e5e7eb);
    border-radius: 8px;
    margin-bottom: 14px;
}
.mp-solver-status {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    font-size: 14px;
}
.mp-solver-spacer { flex: 1 1 auto; }
.mp-solver-moves, .mp-solver-timer, .mp-solver-progress {
    padding: 4px 10px;
    background: var(--card-bg, #fff);
    border: 1px solid var(--border-color, #e5e7eb);
    border-radius: 999px;
    font-size: 13px;
}
.mp-solver-moves strong, .mp-solver-timer strong, .mp-solver-progress strong {
    color: var(--primary-color, #2563eb);
    font-variant-numeric: tabular-nums;
}

.mp-solver-msg {
    padding: 8px 12px;
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
    border-radius: 6px;
    font-size: 14px;
}
.mp-solver-msg[data-state="fail"] { background: #fee2e2; color: #991b1b; border-color: #fecaca; }
.mp-solver-msg[data-state="info"] { background: #eff6ff; color: #1e40af; border-color: #bfdbfe; }
[data-theme="dark"] .mp-solver-msg { background: rgba(16, 185, 129, 0.12); color: #a7f3d0; border-color: rgba(16, 185, 129, 0.35); }

.mp-btn-peek, .mp-btn-reset {
    padding: 6px 12px;
    font: inherit;
    font-size: 13px;
    border: 1px solid var(--border-color, #d1d5db);
    background: var(--card-bg, #fff);
    color: var(--text-color, #374151);
    border-radius: 4px;
    cursor: pointer;
    transition: border-color 120ms ease, background 120ms ease, color 120ms ease;
}
.mp-btn-peek:hover:not(:disabled), .mp-btn-reset:hover:not(:disabled) {
    border-color: var(--primary-color, #2563eb);
    color: var(--primary-color, #2563eb);
}
.mp-btn-peek:disabled, .mp-btn-reset:disabled { opacity: 0.5; cursor: not-allowed; }

/* ===== Board ============================================================= */

.mp-board {
    display: grid;
    grid-template-columns: repeat(var(--mp-cols, 4), minmax(0, 1fr));
    gap: 10px;
    margin: 0 auto;
    max-width: 720px;
    perspective: 1000px;
}

@media (max-width: 600px) {
    /* Always 3 columns on narrow screens regardless of data-cols */
    .mp-board { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; }
}

/* ===== Card ============================================================== */

.mp-mcard {
    position: relative;
    aspect-ratio: 3 / 4;
    cursor: pointer;
    background: transparent;
    border: none;
    padding: 0;
    transform-style: preserve-3d;
    transition: transform 450ms cubic-bezier(0.22, 1.4, 0.36, 1);
    outline: none;
    font: inherit;
    color: inherit;
}
.mp-mcard.is-flipped  { transform: rotateY(180deg); }
.mp-mcard.is-matched  { cursor: default; }
.mp-mcard.is-matched  .mp-mcard-front { border-color: #10b981; box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.25); }
.mp-mcard.is-locked   { pointer-events: none; }
.mp-mcard:focus-visible { outline: 2px solid var(--primary-color, #2563eb); outline-offset: 3px; border-radius: 8px; }

.mp-mcard-face {
    position: absolute;
    inset: 0;
    -webkit-backface-visibility: hidden;
            backface-visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6px;
    border-radius: 8px;
    border: 1px solid var(--border-color, #e5e7eb);
    background: var(--card-bg, #fff);
    text-align: center;
    word-break: break-word;
    hyphens: auto;
    font-size: clamp(11px, 2.4vw, 16px);
    line-height: 1.25;
    transition: border-color 180ms ease;
    overflow: hidden;
}
.mp-mcard-back {
    background: linear-gradient(135deg, var(--primary-color, #2563eb), var(--secondary-color, #1d4ed8));
    color: #fff;
    font-size: clamp(18px, 5vw, 28px);
    font-weight: 800;
    border-color: var(--primary-color, #2563eb);
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.15), 0 2px 6px rgba(37,99,235,0.25);
}
.mp-mcard-front {
    transform: rotateY(180deg);
    color: var(--text-color, #111827);
    font-weight: 600;
}

[data-theme="dark"] .mp-mcard-face  { background: var(--card-bg, #1f2937); border-color: #374151; color: #f9fafb; }
[data-theme="dark"] .mp-mcard-back  { background: linear-gradient(135deg, #1d4ed8, #1e3a8a); border-color: #3b82f6; }
[data-theme="dark"] .mp-mcard.is-matched .mp-mcard-front { border-color: #10b981; box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.35); }

/* ===== Answers page (static, printable) ================================= */

.mp-answers {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin: 16px 0;
}
.mp-answer-row {
    display: grid;
    grid-template-columns: 40px 1fr 24px 1fr;
    grid-template-rows: auto auto;
    align-items: center;
    gap: 6px 10px;
    padding: 10px 14px;
    border: 1px solid var(--border-color, #e5e7eb);
    border-radius: 6px;
    background: var(--card-bg, #fff);
    font-size: 14px;
}
.mp-answer-num {
    grid-row: 1 / 3;
    font-weight: 700;
    color: var(--text-color, #374151);
    background: var(--border-color, #e5e7eb);
    padding: 2px 6px;
    border-radius: 999px;
    text-align: center;
    font-size: 12px;
    align-self: center;
}
.mp-answer-sidea, .mp-answer-sideb {
    font-weight: 600;
    color: var(--text-color, #111827);
}
.mp-answer-sideb { color: var(--primary-color, #1e40af); }
.mp-answer-sep   { color: var(--text-light, #9ca3af); text-align: center; font-size: 16px; }
.mp-answer-explain {
    grid-column: 2 / -1;
    font-size: 12px;
    color: var(--text-light, #6b7280);
    font-style: italic;
}

/* ===== Hub list ========================================================== */

.memory-pairs-list {
    list-style: none;
    margin: 16px 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 10px;
}
.memory-pairs-list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 14px;
    background: var(--card-bg, #fff);
    border: 1px solid var(--border-color, #e5e7eb);
    border-radius: 8px;
    transition: border-color 150ms ease, transform 150ms ease, box-shadow 150ms ease;
}
.memory-pairs-list-item:hover {
    border-color: var(--primary-color, #2563eb);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md, 0 4px 10px rgba(0, 0, 0, 0.08));
}
.memory-pairs-list-title {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: var(--primary-color, #2563eb);
    flex: 1 1 auto;
}
.memory-pairs-list-title:hover strong { text-decoration: underline; }
.memory-pairs-list-title strong { font-size: 15px; }
.memory-pairs-list-title small {
    font-size: 11px;
    color: var(--text-light, #6b7280);
    margin-top: 4px;
    font-weight: 400;
    display: inline-flex;
    gap: 2px;
    flex-wrap: wrap;
    align-items: center;
}
.memory-pairs-list-size {
    background: var(--background-alt, #f3f4f6);
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 10px;
    font-family: Menlo, Consolas, monospace;
}
.memory-pairs-list-answers {
    font-size: 12px;
    color: var(--text-light, #6b7280);
    text-decoration: none;
    padding: 4px 10px;
    border: 1px solid var(--border-color, #e5e7eb);
    border-radius: 999px;
    white-space: nowrap;
    margin-left: 8px;
}
.memory-pairs-list-answers::before { content: "→ "; }
.memory-pairs-list-answers:hover { color: var(--primary-color, #2563eb); border-color: var(--primary-color, #2563eb); }

/* ===== Daily card ======================================================== */

.memory-pairs-daily {
    padding: 14px 18px;
    border-left: 4px solid var(--primary-color, #2563eb);
    background: var(--background-alt, #f9fafb);
    border-radius: 6px;
    margin: 16px 0;
}
.memory-pairs-daily-h {
    margin: 0 0 6px;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-light, #6b7280);
    font-weight: 700;
}
.memory-pairs-daily-link {
    text-decoration: none;
    color: var(--primary-color, #2563eb);
    font-size: 16px;
    display: block;
}
.memory-pairs-daily-meta {
    display: block;
    font-size: 11px;
    color: var(--text-light, #6b7280);
    margin-top: 6px;
}

/* ===== Print ============================================================= */

@media print {
    .mp-solver-controls { display: none !important; }

    /* Can't animate flips in print — force all cards face-up so a
       printed page is useful (still tells the student what they'd see). */
    .mp-mcard { transform: none !important; aspect-ratio: auto; }
    .mp-mcard-back { display: none; }
    .mp-mcard-front {
        position: static;
        transform: none;
        padding: 8pt;
        margin-bottom: 4pt;
    }
    .mp-board {
        grid-template-columns: repeat(3, 1fr);
        gap: 4pt;
    }
    .mp-answer-row { break-inside: avoid; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    .mp-mcard { transition: transform 120ms ease; }
}