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.4s}.fc-progress-label{font-family:var(--font-mono);color:var(--text-4);font-size:11px;font-weight:500}.fc-known-badge{font-family:var(--font-mono);color:var(--green);background:var(--green-bg);border:1px solid var(--green-border);white-space:nowrap;border-radius:20px;padding:3px 11px;font-size:11.5px;font-weight:700}.fc-card{perspective:1400px;cursor:pointer;width:100%;max-width:640px;height:270px}.fc-card-inner{width:100%;height:100%;transform-style:preserve-3d;transition:transform .48s cubic-bezier(.4,0,.2,1);position:relative}.fc-card.flipped .fc-card-inner{transform:rotateY(180deg)}.fc-face{backface-visibility:hidden;border-radius:var(--r-xl);text-align:center;flex-direction:column;justify-content:center;align-items:center;padding:32px 44px;display:flex;position:absolute;inset:0}.fc-front{background:var(--surface);border:2px solid var(--signal-200);box-shadow:var(--shadow)}.fc-back{background:linear-gradient(140deg,var(--signal-900) 0%,var(--signal-700) 100%);box-shadow:var(--shadow-lg);transform:rotateY(180deg)}.fc-side-label{text-transform:uppercase;letter-spacing:2px;margin-bottom:14px;font-size:9px;font-weight:800}.fc-front .fc-side-label{color:var(--signal-400)}.fc-back .fc-side-label{color:#ffffff61}.fc-text{font-size:17px;font-weight:600;line-height:1.55}.fc-front .fc-text{color:var(--text)}.fc-back .fc-text{color:#fff}.fc-hint{color:var(--text-4);margin-top:14px;font-size:10.5px}.fc-actions{gap:12px;display:flex}.fc-btn{border-radius:var(--r);cursor:pointer;border:2px solid;padding:10px 26px;font-family:inherit;font-size:13px;font-weight:700;transition:all .14s}.fc-btn-review{color:var(--amber);background:var(--amber-bg);border-color:oklch(87% .09 75)}.fc-btn-review:hover{background:oklch(93% .06 78);transform:translateY(-1px)}.fc-btn-known{border-color:var(--green-border);color:var(--green);background:var(--green-bg)}.fc-btn-known:hover{background:oklch(94% .05 150);transform:translateY(-1px)}.fc-nav{justify-content:space-between;align-items:center;gap:14px;width:100%;max-width:640px;display:flex}.fc-nav-btn{border:1px solid var(--border);border-radius:var(--r-sm);background:var(--surface);color:var(--text-2);cursor:pointer;min-width:82px;padding:8px 18px;font-family:inherit;font-size:12.5px;font-weight:600;transition:all .12s}.fc-nav-btn:hover:not(:disabled){background:var(--tint);border-color:var(--signal-200);color:var(--signal-700)}.fc-nav-btn:disabled{opacity:.28;cursor:default}.fc-dots{flex-wrap:wrap;flex:1;justify-content:center;gap:5px;display:flex}.fc-dot{background:var(--border);cursor:pointer;border:none;border-radius:50%;width:7px;height:7px;padding:0;transition:all .14s}.fc-dot.active{background:var(--signal-600);transform:scale(1.4)}.fc-dot.known{background:var(--green)}.chat-messages{flex-direction:column;flex:1;gap:14px;padding:24px 30px;display:flex;overflow-y:auto}.chat-empty-state{text-align:center;color:var(--text-3);flex-direction:column;flex:1;justify-content:center;align-items:center;gap:10px;padding:40px;display:flex}.chat-empty-icon{font-size:28px}.chat-empty-state p{max-width:320px;font-size:13.5px;line-height:1.6}.message{display:flex}.message-user{justify-content:flex-end}.message-assistant{justify-content:flex-start}.message-bubble{white-space:pre-wrap;border-radius:14px;max-width:70%;padding:12px 16px;font-size:13.5px;line-height:1.65}.message-user .message-bubble{background:linear-gradient(135deg,var(--signal-800),var(--signal-600));color:#fff;box-shadow:0 2px 8px oklch(47% .13 var(--signal-hue) / .18);border-bottom-right-radius:4px}.message-assistant .message-bubble{background:var(--surface);color:var(--text);border:1px solid var(--border);box-shadow:var(--shadow-sm);border-bottom-left-radius:4px}.typing{align-items:center;gap:5px;padding:14px 18px;display:flex}.typing span{background:var(--text-4);border-radius:50%;width:7px;height:7px;animation:1.2s infinite bounce}.typing span:nth-child(2){animation-delay:.2s}.typing span:nth-child(3){animation-delay:.4s}@keyframes bounce{0%,80%,to{opacity:.4;transform:translateY(0)}40%{opacity:1;transform:translateY(-6px)}}.chat-input-row{background:var(--surface);border-top:1px solid var(--border);flex-shrink:0;gap:9px;padding:14px 30px;display:flex}.chat-input{border:1.5px solid var(--border);border-radius:var(--r);color:var(--text);background:var(--surface);outline:none;flex:1;padding:10px 14px;font-family:inherit;font-size:13.5px;transition:border-color .15s}.chat-input:focus{border-color:var(--signal-500);box-shadow:0 0 0 3px oklch(47% .13 var(--signal-hue) / .07)}.send-btn{background:linear-gradient(135deg,var(--signal-800),var(--signal-600));color:#fff;border-radius:var(--r);cursor:pointer;box-shadow:0 2px 8px oklch(47% .13 var(--signal-hue) / .22);border:none;padding:10px 20px;font-family:inherit;font-size:13.5px;font-weight:700;transition:all .15s}.send-btn:hover:not(:disabled){box-shadow:0 4px 12px oklch(47% .13 var(--signal-hue) / .32);transform:translateY(-1px)}.send-btn:disabled{opacity:.38;cursor:not-allowed}.chat-error{background:var(--red-bg);border-top:1px solid var(--red-border);color:oklch(45% .17 25);flex-shrink:0;align-items:center;gap:9px;padding:10px 20px;font-size:13px;display:flex}.chat-error-icon{flex-shrink:0;font-size:15px}.chat-error-retry{border-radius:var(--r-sm);color:oklch(45% .17 25);cursor:pointer;white-space:nowrap;background:0 0;border:1px solid oklch(45% .17 25);margin-left:auto;padding:4px 12px;font-family:inherit;font-size:12px;font-weight:600}.chat-error-retry:hover{background:var(--red-bg)}