.pth-flashcards-page{max-width:1440px;margin:0 auto;padding:28px 22px 52px;display:grid;grid-template-columns:minmax(0,1fr) 286px;gap:24px;color:#0f172a}
.pth-flashcards-main{min-width:0}.pth-flash-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:14px}.pth-flash-head>div:first-child>span{font-size:12px;font-weight:900;letter-spacing:.12em;color:#2563eb}.pth-flash-head h1{margin:4px 0 4px;font-size:30px;line-height:1.1}.pth-flash-head p{margin:0;color:#64748b;font-size:14px;font-weight:600}.pth-flash-head-tools{display:flex;align-items:flex-end;gap:12px}.pth-flash-head-tools label{font-size:12px;font-weight:800;color:#475569;display:grid;gap:5px}.pth-flash-head-tools select{min-width:230px;height:42px;border:1px solid #cbd5e1;border-radius:10px;background:#fff;padding:0 34px 0 12px;font-weight:800}.pth-flash-head-tools>strong{display:inline-flex;height:42px;align-items:center;padding:0 14px;border:1px solid #bfdbfe;border-radius:999px;background:#eff6ff;color:#1d4ed8;font-size:13px;white-space:nowrap}
.pth-flash-progress{height:8px;border-radius:999px;background:#e2e8f0;overflow:hidden;margin-bottom:18px;box-shadow:inset 0 1px 2px rgba(15,23,42,.08)}.pth-flash-progress i{display:block;width:0;height:100%;background:linear-gradient(90deg,#2563eb,#1d4ed8);border-radius:inherit;transition:width .25s ease}
.pth-flash-scene{height:470px;perspective:1300px;outline:none}.pth-flash-card{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.4,.2,.2,1);border-radius:22px;box-shadow:0 22px 55px rgba(15,23,42,.18),0 8px 20px rgba(15,23,42,.10)}.pth-flash-card.is-flipped{transform:rotateY(180deg)}.pth-flash-face{position:absolute;inset:0;backface-visibility:hidden;border-radius:22px;padding:28px 34px;display:flex;flex-direction:column;justify-content:space-between;border:2px solid #dce5ef;background:#fff;overflow:auto}.pth-flash-front{background:linear-gradient(180deg,#fff 0%,#fbfdff 100%)}.pth-flash-back{transform:rotateY(180deg);border-color:#a7c7f7;background:linear-gradient(180deg,#fff 0%,#f8fbff 100%)}
.pth-flash-meta{display:flex;align-items:center;justify-content:space-between;gap:12px}.pth-flash-category{font-size:11px;font-weight:900;letter-spacing:.08em;text-transform:uppercase;color:#1d4ed8;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;padding:6px 10px}.pth-flash-category.is-answer{color:#047857;background:#ecfdf5;border-color:#a7f3d0}.pth-flash-meta>div{display:flex;gap:8px;align-items:center}.pth-flash-en{display:inline-flex;align-items:center;justify-content:center;min-width:34px;height:28px;padding:0 9px;border-radius:8px;background:#0f172a;color:#fff;font-size:11px;letter-spacing:.08em}.pth-flash-lang{height:30px;min-width:38px;padding:0 10px;border:1px solid #fecaca;border-radius:8px;background:#fff1f2;color:#b91c1c;font-size:11px;font-weight:900;cursor:pointer;box-shadow:0 4px 10px rgba(185,28,28,.12)}.pth-flash-lang:hover{transform:translateY(-1px);box-shadow:0 7px 15px rgba(185,28,28,.18)}
.pth-flash-content{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:12px;max-width:760px;width:100%;margin:auto}.pth-flash-content>small{font-size:11px;font-weight:900;letter-spacing:.12em;color:#64748b}.pth-flash-content h2{margin:0;font-size:32px;line-height:1.28;letter-spacing:-.02em}.pth-flash-content>p{margin:0;color:#64748b;font-size:15px;font-weight:600}.pth-flash-content h3{margin:0;color:#047857;font-size:26px;line-height:1.25}.pth-flash-answer{font-size:17px;line-height:1.65;color:#334155;max-width:720px}.pth-flash-memory,.pth-flash-trap{width:100%;border-radius:12px;padding:11px 14px;text-align:left;display:flex;gap:12px;align-items:flex-start}.pth-flash-memory{background:#fffbeb;border:1px solid #fde68a;color:#92400e}.pth-flash-trap{background:#fff1f2;border:1px solid #fecdd3;color:#9f1239}.pth-flash-memory span,.pth-flash-trap span{font-size:10px;letter-spacing:.08em;font-weight:900;white-space:nowrap;margin-top:3px}.pth-flash-memory strong,.pth-flash-trap strong{font-size:13px;line-height:1.45}.pth-flash-translation{width:100%;margin-top:2px;border-top:2px dashed #fecaca;padding:12px 12px 0;color:#c1121f;text-align:left;font-size:14px;line-height:1.55}.pth-flash-translation b{color:#991b1b}.pth-flash-translation p{margin:4px 0}.pth-flash-translation .is-missing{font-weight:800;color:#b91c1c}
.pth-flash-footer{display:flex;align-items:center;justify-content:space-between;gap:16px;border-top:1px solid #e8edf3;padding-top:14px;color:#64748b;font-size:12px;font-weight:700}.pth-flash-flip{border:1px solid #1d4ed8;background:linear-gradient(180deg,#3b82f6,#2563eb);color:#fff;border-radius:11px;padding:10px 18px;font-size:13px;font-weight:900;cursor:pointer;box-shadow:0 8px 18px rgba(37,99,235,.28),0 2px 5px rgba(15,23,42,.15);transition:.18s}.pth-flash-flip:hover{transform:translateY(-2px);box-shadow:0 12px 23px rgba(37,99,235,.34),0 3px 8px rgba(15,23,42,.18)}
.pth-flash-nav{display:flex;justify-content:space-between;gap:12px;margin-top:18px}.pth-flash-nav button{min-width:132px;border:1px solid #cbd5e1;background:#fff;color:#0f172a;border-radius:10px;padding:10px 16px;font-weight:850;cursor:pointer;box-shadow:0 5px 13px rgba(15,23,42,.07)}.pth-flash-nav button:hover{border-color:#2563eb;color:#1d4ed8;background:#eff6ff}.pth-flash-rating{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:12px}.pth-flash-rating button{border-radius:10px;padding:10px 12px;font-weight:850;border:1px solid transparent;cursor:pointer}.pth-flash-rating [data-flash-rate="hard"]{background:#fff1f2;color:#be123c;border-color:#fecdd3}.pth-flash-rating [data-flash-rate="good"]{background:#fffbeb;color:#b45309;border-color:#fde68a}.pth-flash-rating [data-flash-rate="mastered"]{background:#ecfdf5;color:#047857;border-color:#a7f3d0}.pth-flash-rating button.is-rated{box-shadow:0 0 0 2px currentColor inset}
.pth-flash-rail{position:sticky;top:86px;align-self:start;background:#fff;border:1px solid #dbe4ee;border-radius:16px;box-shadow:0 12px 28px rgba(15,23,42,.11);overflow:hidden;max-height:690px}.pth-flash-rail-head{padding:16px 16px 12px;border-bottom:1px solid #e5e7eb;background:#fbfdff}.pth-flash-rail-head span{display:block;color:#2563eb;font-size:10px;font-weight:900;letter-spacing:.1em}.pth-flash-rail-head strong{display:block;margin-top:3px;font-size:16px}.pth-flash-rail-list{overflow:auto;max-height:620px}.pth-flash-rail-list button{width:100%;text-align:left;border:0;border-bottom:1px solid #eef2f7;background:#fff;padding:11px 14px;cursor:pointer}.pth-flash-rail-list button:hover,.pth-flash-rail-list button.is-active{background:#eff6ff}.pth-flash-rail-list button span{display:block;font-weight:800;color:#0f172a;font-size:13px}.pth-flash-rail-list button small{display:block;margin-top:3px;color:#64748b;font-size:10px}.pth-flash-empty{max-width:900px;margin:40px auto;padding:30px;background:#fff;border:1px solid #e2e8f0;border-radius:16px;box-shadow:0 12px 30px rgba(15,23,42,.08)}
@media(max-width:980px){.pth-flashcards-page{grid-template-columns:1fr}.pth-flash-rail{position:static;max-height:none}.pth-flash-rail-list{display:flex;overflow:auto;max-height:none}.pth-flash-rail-list button{min-width:180px;border-right:1px solid #eef2f7}.pth-flash-head{align-items:flex-start;flex-direction:column}.pth-flash-head-tools{width:100%;justify-content:space-between}.pth-flash-head-tools label{flex:1}.pth-flash-head-tools select{width:100%}}
@media(max-width:640px){.pth-flashcards-page{padding:18px 12px 36px}.pth-flash-head h1{font-size:25px}.pth-flash-head p{font-size:13px}.pth-flash-head-tools{align-items:stretch}.pth-flash-head-tools select{min-width:0}.pth-flash-scene{height:520px}.pth-flash-face{padding:20px 18px}.pth-flash-content h2{font-size:25px}.pth-flash-content h3{font-size:21px}.pth-flash-answer{font-size:15px}.pth-flash-memory,.pth-flash-trap{display:block}.pth-flash-memory span,.pth-flash-trap span{display:block;margin-bottom:4px}.pth-flash-rating{grid-template-columns:1fr}.pth-flash-nav button{min-width:0;flex:1}.pth-flash-footer>span{display:none}}

/* Smart Flash Cards 1.1.0 */
.pth-flash-scene{height:590px}.pth-flash-quick{width:100%;margin-top:8px;text-align:left}.pth-flash-quick-toggle{width:100%;display:flex;justify-content:space-between;border:1px solid #93c5fd;background:linear-gradient(180deg,#eff6ff,#dbeafe);color:#1d4ed8;border-radius:11px;padding:11px 14px;font-weight:900;cursor:pointer;box-shadow:0 7px 18px rgba(37,99,235,.12)}.pth-flash-quick-panel{margin-top:8px;border:1px solid #bfdbfe;background:rgba(255,255,255,.86);border-radius:12px;padding:14px;box-shadow:0 10px 25px rgba(15,23,42,.09)}.pth-flash-quick-panel>strong{display:block;margin-bottom:10px}.pth-flash-quick-options{display:grid;grid-template-columns:1fr 1fr;gap:8px}.pth-flash-quick-choice{display:flex;gap:8px;text-align:left;border:1px solid #cbd5e1;background:#fff;border-radius:9px;padding:9px 10px;cursor:pointer}.pth-flash-quick-choice b{flex:0 0 24px;color:#1d4ed8}.pth-flash-quick-choice.is-selected{border-color:#2563eb;box-shadow:0 0 0 2px rgba(37,99,235,.12)}.pth-flash-quick-choice.is-correct{border-color:#10b981;background:#ecfdf5}.pth-flash-quick-choice.is-wrong{border-color:#fb7185;background:#fff1f2}.pth-flash-show-answer{margin-top:10px;border:1px solid #1d4ed8;background:#2563eb;color:#fff;border-radius:9px;padding:8px 12px;font-weight:850;cursor:pointer}.pth-flash-quick-answer{margin-top:10px;padding:10px 12px;border-left:4px solid #10b981;background:#ecfdf5;border-radius:8px;color:#065f46}.pth-flash-related{width:100%;border:1px solid #c4b5fd;background:linear-gradient(135deg,#f5f3ff,#eef2ff);border-radius:12px;padding:11px 14px;text-align:left}.pth-flash-related>span{display:block;font-size:10px;font-weight:900;letter-spacing:.08em;color:#6d28d9;margin-bottom:8px}.pth-flash-related>div{display:flex;gap:8px;flex-wrap:wrap}.pth-flash-related-chip{border:1px solid #cbd5e1;background:#fff;border-radius:999px;padding:7px 11px;cursor:pointer;font-weight:800}.pth-flash-related-chip small{font-size:8px;margin-right:5px;color:#64748b}.pth-flash-related-chip.is-compare,.pth-flash-related-chip.is-confuse{border-color:#fda4af;background:#fff1f2;color:#9f1239}.pth-flash-related-chip.is-contrast{border-color:#fdba74;background:#fff7ed;color:#9a3412}@media(max-width:640px){.pth-flash-scene{height:680px}.pth-flash-quick-options{grid-template-columns:1fr}}