.card-scene { perspective:1800px; }
.flashcard { display:grid; position:relative; transform-style:preserve-3d; transition:transform 850ms cubic-bezier(.22,.68,.15,1); overflow:visible; touch-action:pan-y pinch-zoom; cursor:pointer; border-radius:8px; }
.flashcard.is-flipped { transform:rotateY(180deg); }
.card-face { grid-area:1 / 1; min-width:0; min-height:480px; padding:clamp(1.5rem,5vw,3.7rem); display:flex; flex-direction:column; overflow:visible; border:1px solid #ccc0ad; border-radius:8px; backface-visibility:hidden; -webkit-backface-visibility:hidden; box-shadow:0 18px 45px -28px #43351f66; }
.card-front { background:linear-gradient(130deg,#fffdf7 0%,#f5eddc 100%); }
.card-back { transform:rotateY(180deg); background:linear-gradient(145deg,#f1ecdf,#e7e0d2); }
.card-meta { display:flex; gap:1rem; justify-content:space-between; align-items:baseline; color:#5a5144; font-size:.65rem; letter-spacing:.15em; text-transform:uppercase; }
.card-meta span { overflow-wrap:anywhere; }
.front-copy { padding:1.3rem 0; flex:1; display:flex; flex-direction:column; justify-content:center; }
.editorial-symbol { font:2rem var(--font-title); color:#776034; margin-bottom:.8rem; }
.card-front h2 { font-size:clamp(2.2rem,5vw,3.7rem); max-width:18ch; margin-bottom:1rem; }
.subtitle { font:italic 1.15rem/1.5 var(--font-title); color:#5b5447; margin-bottom:.8rem; }
.hook { font-size:1rem; max-width:45ch; margin:0; white-space:pre-wrap; }
.evidence { font-size:.7rem; color:#4e5848; margin-top:1rem; }
.card-bottom { display:flex; align-items:end; gap:1rem; justify-content:space-between; margin-top:1rem; }
.signature { display:block; font:1.4rem/1.6 var(--font-signature); text-align:right; color:#514b3e; margin-left:auto; max-width:100%; }
.card-bottom .signature { flex:1; }
.flip-button { border:1px solid #bdb19d; border-radius:50%; font-size:1.6rem; flex-shrink:0; }
.back-copy { flex:1; }
.back-copy .eyebrow { color:#4e5549; margin-bottom:.8rem; }
.lesson { font:clamp(1.35rem,3vw,1.8rem)/1.5 var(--font-title); white-space:pre-wrap; }
.apply { font-size:1rem; white-space:pre-wrap; }
.back-divider { width:36px; height:1px; background:#9d824c; margin:1.6rem 0; }
.back-actions { display:flex; align-items:center; justify-content:space-between; gap:1rem; margin-top:1.2rem; }
#back-signature { margin-top:1rem; }

.card-origin { margin-top:1rem; font-size:.7rem; line-height:1.6; color:#514b3e; overflow-wrap:anywhere; cursor:default; }
.card-origin a { display:inline-block; padding:.3rem 0; }
.card-face { border-top:3px solid var(--card-accent,#C6A15B); }
.flashcard[data-theme="sage"] .card-face { background:#E8EDE5; }
.flashcard[data-theme="blue"] .card-face { background:#E5ECF2; }
.flashcard[data-theme="plum"] .card-face { background:#EDE5ED; }
.flashcard[data-theme="terracotta"] .card-face { background:#F1E2D9; }
.flashcard[data-theme="sand"] .card-face { background:#EFE7D5; }

/* As animações não alteram a altura das faces nem comandam o flip. */
.card-face { position:relative; }
.card-face::after { content:''; position:absolute; inset:0; border-radius:inherit; pointer-events:none; background:linear-gradient(110deg,transparent 38%,#ffffff70 49%,transparent 60%); background-size:260% 100%; background-position:120% 0; opacity:0; }
.flashcard.is-entering .front-copy { animation:card-copy-in 360ms ease-out both; }
.flashcard.is-entering .card-front::after { animation:card-sheen 850ms ease-out; }
.flashcard.is-flipped .card-back::after { animation:card-sheen 900ms ease-out; }
.flashcard.is-flipped .signature:not([hidden]) { animation:signature-write 450ms 300ms ease-out both; }
@keyframes card-copy-in { from { opacity:0; transform:translateY(7px); } to { opacity:1; transform:translateY(0); } }
@keyframes card-sheen { 0% { opacity:0; background-position:120% 0; } 30% { opacity:.2; } 100% { opacity:0; background-position:-30% 0; } }
@keyframes signature-write { from { clip-path:inset(0 0 0 100%); } to { clip-path:inset(0); } }
@media (prefers-reduced-motion:reduce) {
 .flashcard,.flashcard *,.card-face::after { animation:none !important; transition:none !important; clip-path:none !important; }
}