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cubic-bezier(.4,.2,.2,1);transform-style:preserve-3d}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.fc-face{position:absolute;inset:0;-webkit-backface-visibility:hidden;backface-visibility:hidden;border-radius:var(--radius-lg);border:2px solid var(--line);box-shadow:var(--shadow);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:22px;text-align:center;gap:8px}.fc-front{background:var(--paper-card)}.fc-back{background:var(--ink);color:var(--paper-card);transform:rotateY(180deg)}.fc-tag{font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.04em;color:var(--accent-ink)}.fc-back .fc-tag{color:var(--accent)}.fc-q{font-size:17px;font-weight:800}.fc-a{font-size:14.5px;line-height:1.5}.fc-hint{font-size:11.5px;color:var(--ink-faint)}.fc-back .fc-hint{color:#a99a83}.fc-nav{display:flex;align-items:center;gap:14px}.fc-nav-btn{width:40px;height:40px;border-radius:50%;border:2px solid var(--line);background:var(--paper-card);font-size:16px;cursor:pointer;color:var(--ink)}.fc-nav-btn:hover{border-color:var(--accent)}.fc-counter{font-size:12.5px;font-weight:700;color:var(--ink-faint);font-feature-settings:"tnum";font-variant-numeric:tabular-nums;min-width:64px;text-align:center}.fc-known-row{display:flex;gap:8px}.fc-mark-btn{border:2px solid var(--line);border-radius:999px;padding:7px 14px;font-size:12.5px;font-weight:800;cursor:pointer;background:var(--paper-card);color:var(--ink-soft)}.fc-mark-btn.on.know{background:var(--teal-soft);border-color:var(--teal);color:var(--teal)}.fc-mark-btn.on.learn{background:var(--coral-soft);border-color:var(--coral);color:var(--coral)}.mindmap-card{padding:22px;overflow-x:auto}.mindmap-svg-wrap{position:relative;width:100%;min-width:640px;height:420px}.mm-node{position:absolute;transform:translate(-50%,-50%);background:var(--paper-raised);border:2px solid var(--line);border-radius:999px;padding:8px 14px;font-size:12px;font-weight:800;white-space:nowrap;box-shadow:var(--shadow);opacity:0;animation:nodePop .5s ease forwards}.mm-node.root{background:var(--ink);color:var(--paper-card);font-size:15px;padding:14px 22px}.mm-node.branch{border-color:var(--teal);color:var(--teal)}.mm-node.leaf{border-color:var(--accent);color:var(--accent-ink);font-size:11px;padding:6px 11px;font-weight:700}.mm-line{stroke:var(--line);stroke-width:2;opacity:0;animation:fadeIn .5s ease forwards}.slidedeck{margin-top:26px}.slide-toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.slide-viewport{overflow:hidden;border-radius:var(--radius-lg)}.slide-track{display:flex;transition:transform .45s cubic-bezier(.4,.1,.2,1)}.slide{flex:0 0 100%;padding:30px 26px;display:flex;flex-direction:column;gap:10px;min-height:230px;background:var(--paper-card);border:2px solid var(--line)}.slide-eyebrow{font-size:11.5px;font-weight:800;text-transform:uppercase;letter-spacing:.05em;color:var(--accent-ink)}.slide h3{font-size:21px}.slide-points{margin:0;padding-left:20px;font-size:14px;color:var(--ink-soft);display:flex;flex-direction:column;gap:5px}.slide-icon{font-size:30px}.slide-dots{display:flex;gap:6px;justify-content:center;margin-top:12px}.slide-dot{width:8px;height:8px;border-radius:50%;background:var(--line);border:none;cursor:pointer;padding:0}.slide-dot.active{background:var(--accent);width:20px;border-radius:5px;transition:width .25s ease}@media(max-width:600px){.brand-text h1{font-size:22px}.header-meta{display:none}.quiz-panel{padding:18px}}