/* ============================================================================
   backpack.css  —  🎒 The Mystery Backpack (school-subject picker) styling (.bpk-*)
   A red school backpack: shake → unzip → open → a subject card rises out.
   Self-contained. Warm red canvas bag, brass zip, per-subject card band.
   ============================================================================ */
.bpk-stage { position: relative; }
.bpk-panel { background: linear-gradient(180deg, #f3f5fa, #e8ecf4); border-radius: 18px; padding: 10px 18px 20px; position: relative; overflow: hidden;
    box-shadow: inset 0 2px 10px rgba(40, 52, 84, .12); }
body[data-theme] .bpk-panel { background: color-mix(in srgb, var(--theme-surface, #f3f5fa) 88%, #000 4%); }

.bpk-scene { position: relative; width: 100%; max-width: 320px; margin: 0 auto; }
.bpk-svg { display: block; width: 100%; height: auto; overflow: visible; }
.bpk-svg * { transition: none; }               /* neutralise site.css transition:all; ID rules below re-enable the beats */
.bpk-card-emoji { font-family: "Segoe UI Emoji", "Apple Color Emoji", sans-serif; }

.bpk-status { min-height: 20px; color: var(--theme-muted, #69707e); font-size: 13.5px; font-weight: 600; margin-top: 4px; text-align: center; }
.bpk-status b { color: var(--theme-text, #1e2331); }

/* ── idle: the resting bag gently sways so it has life ───────────────────── */
#bpkBag { transform-box: fill-box; transform-origin: 50% 88%; animation: bpkIdle 3s ease-in-out infinite; }
@keyframes bpkIdle { 0%,100% { transform: rotate(-1.7deg); } 50% { transform: rotate(1.7deg); } }

/* ── beat 1: the whole bag shakes (overrides the idle sway during a run) ──── */
#bpkBag.bpk-shake { animation: bpkShake .5s ease-in-out; }
@keyframes bpkShake { 10%,90% { transform: rotate(-2deg); } 30%,70% { transform: rotate(2.5deg); } 50% { transform: rotate(-2.5deg); } }

/* ── beat 2: the zip pull slides slowly across, teeth visibly part ─────────
   The pull's base position is the SVG transform attribute translate(210 127).
   A CSS transform OVERRIDES that attribute, so the keyframes use ABSOLUTE
   translate values — 0% lands exactly where the pull already sits (no jump to
   the SVG origin), then it slides left along the seam. */
.bpk-scene.bpk-unzip #bpkZippull { animation: bpkZipSlide .95s ease-in-out forwards; }
@keyframes bpkZipSlide { 0% { transform: translate(210px,127px); } 50% { transform: translate(144px,135px); } 100% { transform: translate(78px,127px); } }
#bpkZipLine { transition: opacity .55s; }
.bpk-scene.bpk-unzip #bpkZipLine { opacity: 0; }
#bpkZipOpen { stroke-dasharray: 142; stroke-dashoffset: 142; }
.bpk-scene.bpk-unzip #bpkZipOpen { animation: bpkZipReveal .95s ease-in-out forwards; }
@keyframes bpkZipReveal { to { stroke-dashoffset: 0; } }

/* ── beat 3: the bag mouth opens — lid peels back, interior shows ────────── */
#bpkInterior { opacity: 0; transition: opacity .3s; }
.bpk-scene.bpk-open #bpkInterior { opacity: 1; }
#bpkLid { transform-box: fill-box; transform-origin: 50% 96%; transition: transform .5s cubic-bezier(.3,1.25,.4,1); }
.bpk-scene.bpk-open #bpkLid { transform: translateY(-7px) rotate(-13deg); }

/* ── beat 4: the subject card rises out of the open mouth ────────────────── */
#bpkItem { transform-box: fill-box; transform-origin: 50% 100%; opacity: 0; transform: translateY(82px) scale(.55); transition: opacity .2s, transform .64s cubic-bezier(.2,1.35,.35,1); }
.bpk-scene.bpk-rising #bpkItem { opacity: 1; transform: translateY(0) scale(1); }

@media (prefers-reduced-motion: reduce) {
    #bpkBag, #bpkBag.bpk-shake { animation: none; }
    #bpkZippull, #bpkZipOpen, #bpkZipLine, #bpkLid, #bpkInterior, #bpkItem { transition: none !important; animation: none !important; }
    .bpk-scene.bpk-rising #bpkItem { opacity: 1; transform: none; }
    .bpk-scene.bpk-open #bpkLid { transform: translateY(-7px) rotate(-13deg); }
    .bpk-scene.bpk-open #bpkInterior { opacity: 1; }
    .bpk-scene.bpk-unzip #bpkZipOpen { stroke-dashoffset: 0; }
    .bpk-scene.bpk-unzip #bpkZipLine { opacity: 0; }
}

/* ── button + effects ────────────────────────────────────────────────────── */
.bpk-pickbtn-wrap { text-align: center; }
.bpk-pickbtn-main { display: inline-flex; align-items: center; gap: 8px; margin: 14px auto 0; font-size: 15px; font-weight: 800; color: #fff;
    padding: 13px 34px; border-radius: 14px; border: 0; cursor: pointer; letter-spacing: .3px;
    background: linear-gradient(135deg, var(--bpk-grad-a, #e86a5b), var(--bpk-grad-b, #b83b30));
    box-shadow: 0 12px 24px -8px var(--bpk-accent, #d84a3c), inset 0 1px 0 rgba(255,255,255,.22); transition: transform .12s ease, filter .15s; }
.bpk-pickbtn-main:hover { transform: translateY(-2px); filter: brightness(1.05); }
.bpk-pickbtn-main:disabled, .bpk-pickbtn-main.is-busy { opacity: .6; cursor: default; transform: none; filter: grayscale(.2); }

.bpk-effects { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 16px; font-size: 13px; color: var(--theme-text, #1a1a2e); justify-content: center; }
.bpk-effects label { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; }
.bpk-items-ta { width: 100%; min-height: 220px; font-family: monospace; font-size: .9rem; line-height: 1.55; border-radius: 10px; border: 1px solid var(--theme-border, #d7dbe0); background: var(--theme-bg, #fff); color: var(--theme-text, #1a1a2e); padding: 10px 12px; resize: vertical; }
.bpk-items-ta:focus { outline: 2px solid var(--bpk-accent, #d84a3c); outline-offset: 1px; border-color: transparent; }

.page-bpk-scope {
    --wsp-result-accent: var(--bpk-accent, #d84a3c);
    --wsp-result-grad: linear-gradient(135deg, var(--bpk-grad-a, #e86a5b), var(--bpk-grad-b, #b83b30));
    --wsp-result-plate: color-mix(in srgb, var(--bpk-accent, #d84a3c) 13%, #fff);
}

/* ── SEO content (.bpk-content) — type scale from .content-guide; colour only ── */
.bpk-content { color: var(--theme-text, #1a1a2e); background: var(--theme-bg, #fff); padding: 3.25rem 0 3.5rem; margin-top: 1rem; border-top: 1px solid var(--theme-border, #e9ecef); }
.bpk-inner { max-width: 860px; margin: 0 auto; padding: 0 1rem; }
.bpk-content h2, .bpk-content h3 { color: var(--theme-text, #1a1a2e); }
.bpk-content p, .bpk-content li { color: var(--theme-muted, #5b6470); }
.bpk-content strong { color: var(--theme-text, #1a1a2e); }
.bpk-content a { color: #c23a2d; text-decoration: underline; text-underline-offset: 2px; font-weight: 600; }
.bpk-kicker-chip { display: inline-block; font-size: .72rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; color: #fff; background: linear-gradient(135deg, #e86a5b, #b83b30); border-radius: 999px; padding: .3rem .85rem; margin-bottom: .95rem; }
.bpk-content .bpk-lead { font-size: 1.2rem; line-height: 1.7; color: var(--theme-text, #1a1a2e); margin-bottom: 1.25rem; }
.bpk-section { margin-top: 2.9rem; }
.bpk-content .table { font-size: 1rem; }
.bpk-content .table thead th { text-transform: uppercase; letter-spacing: .05em; font-size: .74rem; font-weight: 800; color: #fff; background: #b83b30; padding: .7rem 1rem; }
.bpk-content .table tbody td { padding: .6rem 1rem; border-bottom: 1px solid var(--theme-border, #e9ecef); vertical-align: top; }
.bpk-content .table tbody td:first-child { font-weight: 700; color: var(--theme-text, #1a1a2e); white-space: nowrap; }
.bpk-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 1.5rem; }
.bpk-pair-card { background: var(--theme-surface, #f8f9fa); border: 1px solid var(--theme-border, #e9ecef); border-radius: 12px; padding: 1rem 1.1rem; border-top: 3px solid #e86a5b; }
.bpk-pair-card h3 { margin-top: 0 !important; font-size: 1.02rem !important; } .bpk-pair-card p:last-child { margin-bottom: 0; font-size: .92rem; }
.bpk-faq { margin-top: 1.4rem; }
.bpk-faq .accordion-item { background: transparent; border: 0; border-bottom: 1px solid var(--theme-border, #e9ecef); }
.bpk-faq .accordion-button { background: transparent; color: var(--theme-text, #1a1a2e); font-weight: 600; padding-left: 0; padding-right: 2.5rem; box-shadow: none; }
.bpk-faq .accordion-button:not(.collapsed) { color: #c23a2d; background: transparent; }
.bpk-faq .accordion-button:focus { box-shadow: none; }
.bpk-faq .accordion-body { padding-left: 0; color: var(--theme-muted, #5b6470); }
@media (max-width: 767.98px) { .bpk-pair { grid-template-columns: 1fr; } }
body[data-theme="high-contrast"] .bpk-content p, body[data-theme="high-contrast"] .bpk-content li, body[data-theme="high-contrast"] .bpk-content .bpk-lead { color: rgba(255,255,255,.84); }
body[data-theme="high-contrast"] .bpk-content h2, body[data-theme="high-contrast"] .bpk-content h3 { color: #fff; }