.gstd-flashcard-deck{max-width:560px;margin:1.5em auto;font-family:inherit;text-align:center}
.gstd-fc-title{font-weight:700;margin:0 0 .6em;font-size:1.05em}
.gstd-fc-card{display:block;width:100%;min-height:var(--gstd-height,240px);border:0;background:none;cursor:pointer;perspective:1200px;padding:0}
.gstd-fc-inner{position:relative;display:block;width:100%;height:var(--gstd-height,240px);transition:transform .45s ease;transform-style:preserve-3d;border-radius:var(--gstd-radius,14px)}
.gstd-fc-card.is-flipped .gstd-fc-inner{transform:rotateY(180deg)}
.gstd-fc-face{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;padding:1.2em;font-size:var(--gstd-font-size,22px);font-weight:600;line-height:1.35;border-radius:var(--gstd-radius,14px);backface-visibility:hidden;-webkit-backface-visibility:hidden;box-shadow:0 6px 22px rgba(0,0,0,.12);overflow-wrap:anywhere}
.gstd-fc-front{background:var(--gstd-front-bg,#1e40af);color:var(--gstd-front-color,#fff)}
.gstd-fc-back{background:var(--gstd-back-bg,#fff);color:var(--gstd-back-color,#111827);transform:rotateY(180deg);border:1px solid rgba(0,0,0,.08)}
.gstd-fc-hint{display:block;margin-top:.5em;font-size:.8em;opacity:.6}
.gstd-fc-controls{display:flex;gap:.5em;justify-content:center;align-items:center;margin-top:.9em;flex-wrap:wrap}
.gstd-fc-btn{border:1px solid rgba(0,0,0,.15);background:#fff;border-radius:8px;padding:.45em .9em;cursor:pointer;font-size:.9em}
.gstd-fc-btn:hover{background:#f3f4f6}
.gstd-fc-btn:focus-visible,.gstd-fc-card:focus-visible{outline:3px solid #2563eb;outline-offset:2px}
.gstd-fc-counter{font-size:.9em;min-width:64px}
.gstd-flashcard-error{background:#fef2f2;border:1px solid #fecaca;padding:.7em 1em;border-radius:8px}
@media (prefers-reduced-motion:reduce){.gstd-fc-inner{transition:none}}