/* ───────── Shared toolbar & controls ───────── */
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.select {
  appearance: none; -webkit-appearance: none; border: 1px solid var(--line); border-radius: 999px; padding: 10px 42px 10px 18px;
  font: inherit; font-size: 15px; color: var(--ink); max-width: 100%;
  background: var(--surface) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2356625f' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E") no-repeat right 15px center;
  cursor: pointer;
}
.select:hover { border-color: var(--sage); }
.toggle { display: inline-flex; align-items: center; gap: 8px; padding: 9px 16px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); font-size: 14.5px; color: var(--ink-2); }
.toggle[aria-pressed='true'] { background: var(--sage-l); border-color: var(--sage); color: var(--sage-d); font-weight: 600; }
.kbd-hint { font-size: 13px; color: var(--ink-3); display: flex; flex-wrap: wrap; gap: 6px 16px; justify-content: center; margin-top: 18px; }
.kbd { display: inline-block; min-width: 24px; padding: 1px 7px; border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 7px; font-size: 12px; color: var(--ink-2); background: var(--surface); text-align: center; }

/* ───────── Flashcards ───────── */
.fc-wrap { max-width: 780px; margin: 0 auto; }
.fc-meta { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 22px 0 14px; font-size: 14px; color: var(--ink-2); }
.fc-meta .bar { flex: 1; margin: 0 4px; }
.fc-stage { perspective: 1800px; }
.fc-card {
  position: relative; width: 100%; height: var(--h, 380px); transform-style: preserve-3d; cursor: pointer; border-radius: 30px;
  transition: transform .75s var(--ease), height .3s var(--ease); outline-offset: 6px;
}
.fc-card.is-flipped { transform: rotateY(180deg); }
.fc-face {
  position: absolute; inset: 0; -webkit-backface-visibility: hidden; backface-visibility: hidden; border-radius: 30px;
  padding: clamp(24px, 5vw, 52px); display: flex; overflow-y: auto; border: 1px solid var(--line-2); box-shadow: var(--shadow-lg);
}
.fc-inner { margin: auto; display: flex; flex-direction: column; align-items: center; gap: 18px; text-align: center; width: 100%; }
.fc-front { background: var(--surface); }
.fc-back { background: var(--t-l); transform: rotateY(180deg); }
.fc-q { font-family: var(--font-serif); font-weight: 600; font-size: clamp(22px, 3.6vw, 31px); line-height: 1.45; }
.fc-a { font-size: clamp(17px, 2.4vw, 21px); line-height: 1.8; }
.fc-hint { position: absolute; bottom: 16px; left: 0; right: 0; text-align: center; font-size: 13px; color: var(--ink-3); display: flex; justify-content: center; align-items: center; gap: 6px; pointer-events: none; }
.fc-back .fc-hint { color: var(--t-d); opacity: .75; }
.fc-actions { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 12px; margin-top: 28px; }
.fc-state { display: inline-flex; gap: 6px; align-items: center; font-size: 13px; padding: 3px 10px; border-radius: 999px; }
.fc-state.known { background: var(--ok-l); color: var(--ok); }
.fc-state.learning { background: var(--blush-l); color: var(--blush-d); }
.fc-done { text-align: center; padding: clamp(28px, 5vw, 56px); }
.fc-done h2 { font-size: 28px; margin: 10px 0 8px; }
.fc-done p { color: var(--ink-2); max-width: 30em; margin: 0 auto; }
.fc-counts { display: flex; justify-content: center; gap: 14px; margin: 26px 0; flex-wrap: wrap; }
.fc-counts div { min-width: 130px; padding: 16px 20px; border-radius: 18px; }
.fc-counts b { display: block; font-family: var(--font-serif); font-size: 32px; line-height: 1.1; }
.fc-counts .k { background: var(--ok-l); color: var(--ok); }
.fc-counts .l { background: var(--blush-l); color: var(--blush-d); }
.empty-state { text-align: center; padding: 56px 20px; color: var(--ink-2); }

/* ───────── Matching ───────── */
.set-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(262px, 1fr)); gap: 18px; }
.set-card {
  display: flex; flex-direction: column; gap: 8px; padding: 22px; text-align: left; border-radius: 22px; background: var(--surface);
  border: 1px solid var(--line-2); box-shadow: var(--shadow); color: inherit; text-decoration: none !important;
  transition: transform .3s var(--ease), border-color .3s, box-shadow .3s;
}
.set-card:hover { transform: translateY(-3px); border-color: var(--t); box-shadow: var(--shadow-lg); }
.set-icon { width: 46px; height: 46px; border-radius: 15px; background: var(--t-l); color: var(--t-d); display: grid; place-items: center; margin-bottom: 6px; }
.set-card h3 { font-size: 18px; }
.set-card p { font-size: 14.5px; color: var(--ink-2); }
.set-meta { margin-top: auto; padding-top: 10px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font-size: 13px; color: var(--ink-2); }

.match-panel { padding: clamp(18px, 3.5vw, 36px); }
.match-help { display: flex; gap: 10px; align-items: flex-start; font-size: 14.5px; color: var(--ink-2); padding: 12px 16px; border-radius: 14px; background: var(--sky-l); margin-bottom: 26px; }
.match-help .i { color: var(--sky-d); margin-top: 3px; }
.match-board { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); column-gap: clamp(34px, 12vw, 170px); }
.match-col { display: flex; flex-direction: column; gap: 12px; }
.match-col-head { font-size: 12.5px; font-weight: 600; color: var(--ink-3); padding-left: 6px; margin-bottom: -2px; }
.m-item {
  position: relative; display: flex; align-items: center; min-height: 60px; padding: 12px 20px; border: 1.5px solid var(--line); border-radius: 16px;
  background: var(--surface); font-size: 15.5px; line-height: 1.5; text-align: left; user-select: none; -webkit-user-select: none;
  box-shadow: var(--shadow-sm); transition: border-color .2s, background .2s, box-shadow .2s; z-index: 2;
}
.m-item:hover { border-color: var(--sage); }
.m-item.is-selected { border-color: var(--sage-d); background: var(--sage-l); box-shadow: 0 0 0 4px rgba(127, 168, 150, .28); }
.m-item.is-linked { border-color: var(--sky); background: var(--sky-l); }
.m-item.is-ok { border-color: var(--ok); background: var(--ok-l); }
.m-item.is-bad { border-color: var(--bad); background: var(--bad-l); }
.m-dot { position: absolute; top: 50%; width: 16px; height: 16px; margin-top: -8px; border-radius: 50%; background: var(--surface); border: 2.5px solid #cfc9bb; transition: all .2s; }
.m-item.left .m-dot { right: -9px; }
.m-item.right .m-dot { left: -9px; }
.m-item:hover .m-dot, .m-item.is-selected .m-dot { border-color: var(--sage-d); }
.m-item.is-linked .m-dot { background: var(--sky-d); border-color: var(--sky-d); }
.m-item.is-ok .m-dot { background: var(--ok); border-color: var(--ok); }
.m-item.is-bad .m-dot { background: var(--bad); border-color: var(--bad); }
.match-lines { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; overflow: visible; z-index: 1; }
.ml { fill: none; stroke: var(--sky-d); stroke-width: 2.5; stroke-linecap: round; opacity: .85; }
.ml.ok { stroke: var(--ok); }
.ml.bad { stroke: var(--bad); }
.ml.temp { stroke-dasharray: 2 7; opacity: .7; }
.line-x {
  position: absolute; width: 24px; height: 24px; margin: -12px 0 0 -12px; border-radius: 50%; background: var(--surface); border: 1.5px solid var(--sky-d);
  color: var(--sky-d); display: grid; place-items: center; z-index: 3; box-shadow: var(--shadow-sm);
}
.line-x:hover { background: var(--sky-d); color: #fff; }
.match-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 30px; }
.match-score { margin-left: auto; font-size: 15px; font-weight: 600; padding: 8px 16px; border-radius: 999px; background: var(--surface-2); }
.match-score.perfect { background: var(--ok-l); color: var(--ok); }
@media (max-width: 560px) {
  .m-item { font-size: 14px; padding: 10px 12px; min-height: 54px; }
  .match-board { column-gap: 30px; }
  .match-panel { padding: 16px 14px; }
}

/* ───────── Quiz ───────── */
.setup-grid { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr); gap: 24px; align-items: start; }
@media (max-width: 900px) { .setup-grid { grid-template-columns: 1fr; } }
.setup-card { padding: clamp(22px, 3.5vw, 34px); display: flex; flex-direction: column; gap: 26px; }
.field { display: flex; flex-direction: column; gap: 10px; border: 0; padding: 0; margin: 0; min-width: 0; }
.field legend, .field > label { font-weight: 600; font-size: 15px; padding: 0; margin-bottom: 4px; }
.radio-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.radio-chips label { cursor: pointer; }
.radio-chips input { position: absolute; opacity: 0; pointer-events: none; }
.radio-chips span { display: inline-block; padding: 8px 18px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); font-size: 14.5px; color: var(--ink-2); transition: all .2s; }
.radio-chips label:hover span { border-color: var(--sage); }
.radio-chips input:checked + span { background: var(--sage-d); border-color: var(--sage-d); color: #fff; }
.radio-chips input:focus-visible + span { outline: 2px solid var(--sage-d); outline-offset: 2px; }
.mock-card { padding: 26px; background: var(--lilac-l); border-color: transparent; }
.mock-card h3 { font-size: 20px; margin: 10px 0 8px; }
.mock-card p { color: var(--ink-2); font-size: 15px; margin-bottom: 18px; }
.best-list { display: grid; gap: 10px; margin-top: 18px; }
.best-row { display: flex; justify-content: space-between; gap: 12px; padding: 10px 14px; border-radius: 12px; background: var(--surface-2); font-size: 14px; }

.quiz-wrap { max-width: 820px; margin: 0 auto; }
.quiz-top { display: flex; align-items: center; gap: 16px; margin-bottom: 22px; }
.quiz-top .bar { flex: 1; }
.q-count { font-size: 14px; color: var(--ink-2); font-variant-numeric: tabular-nums; white-space: nowrap; }
.q-timer { display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px; border-radius: 999px; background: var(--lilac-l); color: var(--lilac-d); font-weight: 600; font-size: 14px; font-variant-numeric: tabular-nums; }
.q-timer.low { background: var(--bad-l); color: var(--bad); }
.q-card { padding: clamp(22px, 4vw, 42px); }
.q-text { font-family: var(--font-serif); font-weight: 600; font-size: clamp(20px, 3vw, 26px); line-height: 1.55; margin: 12px 0 26px; }
.q-options { display: grid; gap: 12px; }
.q-opt {
  display: flex; gap: 16px; align-items: flex-start; text-align: left; padding: 16px 18px; border-radius: 16px; border: 1.5px solid var(--line);
  background: var(--surface); font-size: 16.5px; line-height: 1.6; width: 100%; transition: border-color .2s, background .2s, transform .15s;
}
.q-opt:hover:not([disabled]) { border-color: var(--sage); background: #f4f9f6; }
.q-opt:active:not([disabled]) { transform: scale(.995); }
.q-key { flex: none; width: 30px; height: 30px; border-radius: 10px; background: var(--surface-2); color: var(--ink-2); display: grid; place-items: center; font-weight: 600; font-size: 14px; margin-top: 1px; }
.q-opt.is-correct { border-color: var(--ok); background: var(--ok-l); }
.q-opt.is-correct .q-key { background: var(--ok); color: #fff; }
.q-opt.is-wrong { border-color: var(--bad); background: var(--bad-l); }
.q-opt.is-wrong .q-key { background: var(--bad); color: #fff; }
.q-opt[disabled] { cursor: default; }
.q-opt.is-dim { opacity: .72; }
.q-feedback { margin-top: 22px; padding: 16px 20px; border-radius: 16px; display: flex; gap: 12px; align-items: flex-start; animation: rise .35s var(--ease) both; }
.q-feedback.ok { background: var(--ok-l); color: var(--ok); }
.q-feedback.bad { background: var(--bad-l); color: var(--bad); }
.q-feedback b { display: block; margin-bottom: 2px; }
.q-feedback p { color: var(--ink); font-size: 15.5px; line-height: 1.7; }
.q-next { margin-top: 22px; display: flex; justify-content: space-between; align-items: center; gap: 12px; }

.result { text-align: center; padding: clamp(28px, 5vw, 56px); }
.ring { --p: 0; position: relative; width: 176px; height: 176px; margin: 0 auto 24px; border-radius: 50%; display: grid; place-items: center; background: conic-gradient(var(--sage-d) calc(var(--p) * 1%), var(--surface-2) 0); }
.ring::before { content: ''; position: absolute; inset: 13px; border-radius: 50%; background: var(--surface); }
.ring-in { position: relative; line-height: 1.1; }
.ring-in b { display: block; font-family: var(--font-serif); font-size: 42px; }
.ring-in span { font-size: 14px; color: var(--ink-2); }
.result h2 { font-size: 28px; }
.result > p { color: var(--ink-2); margin: 8px auto 0; max-width: 32em; }
.result .hero-actions { justify-content: center; }
.by-chapter { display: grid; gap: 10px; margin: 34px auto 0; max-width: 520px; text-align: left; }
.by-chapter .row { display: grid; grid-template-columns: minmax(0, 1fr) 110px 44px; align-items: center; gap: 12px; font-size: 14px; }
.by-chapter .row span:first-child { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.by-chapter .row em { font-style: normal; text-align: right; color: var(--ink-2); font-variant-numeric: tabular-nums; }
.review-list { margin-top: 44px; display: grid; gap: 14px; text-align: left; }
.review-list h3 { font-size: 20px; text-align: left; }
.review-item { padding: 18px 20px; border-radius: 18px; border: 1px solid var(--line); background: var(--surface); }
.review-item .qq { font-family: var(--font-serif); font-weight: 600; font-size: 16.5px; margin-bottom: 10px; line-height: 1.5; }
.review-item .a { display: flex; gap: 10px; font-size: 15px; line-height: 1.6; margin-top: 6px; }
.review-item .a.bad { color: var(--bad); }
.review-item .a.ok { color: var(--ok); }
.review-item .why { margin-top: 10px; font-size: 14.5px; color: var(--ink-2); padding-top: 10px; border-top: 1px dashed var(--line); }

/* ───────── Timeline ───────── */
.tabs { display: flex; width: 100%; max-width: 520px; padding: 5px; background: var(--surface-2); border-radius: 999px; gap: 4px; margin-bottom: 30px; }
.tab { flex: 1; text-align: center; padding: 9px 10px; border-radius: 999px; font-size: 14.5px; color: var(--ink-2); text-decoration: none !important; white-space: nowrap; }
@media (max-width: 400px) { .tab { font-size: 13.5px; padding: 9px 6px; } }
.tab:hover { color: var(--ink); }
.tab[aria-current='page'] { background: var(--surface); color: var(--ink); font-weight: 600; box-shadow: var(--shadow-sm); }

.tl-group { margin-top: 52px; }
.tl-group:first-of-type { margin-top: 36px; }
.tl-group-head { display: flex; align-items: baseline; flex-wrap: wrap; gap: 6px 14px; margin-bottom: 8px; padding-left: 0; }
.tl-group-head h2 { font-size: 24px; }
.tl-group-head span { font-size: 14px; color: var(--ink-2); }
.tl-item { position: relative; display: grid; grid-template-columns: 148px 36px minmax(0, 1fr); margin-top: 20px; align-items: start; }
.tl-item::before { content: ''; position: absolute; left: 165px; top: 24px; bottom: -22px; width: 2px; background: var(--line); }
.tl-group .tl-item:last-child::before { display: none; }
.tl-year { text-align: right; padding: 12px 8px 0 0; font-family: var(--font-serif); font-weight: 600; font-size: 19px; line-height: 1.3; color: var(--t-d); }
.tl-node { position: relative; z-index: 1; width: 18px; height: 18px; margin: 18px 0 0 8px; border-radius: 50%; background: var(--t); border: 4px solid var(--bg); box-shadow: 0 0 0 2px var(--t); }
.tl-card { padding: 18px 22px; background: var(--surface); border: 1px solid var(--line-2); border-radius: 18px; box-shadow: var(--shadow); }
.tl-card h3 { font-size: 17.5px; }
.tl-card p { color: var(--ink-2); font-size: 15.5px; line-height: 1.75; margin-top: 6px; }
.tl-note { margin-top: 12px; display: flex; gap: 8px; align-items: flex-start; padding: 9px 12px; border-radius: 12px; background: var(--sand-l); color: var(--sand-d); font-size: 13.5px; line-height: 1.55; }
.tl-note .i { margin-top: 3px; }
.tl-foot { margin-top: 12px; font-size: 13.5px; }
.tl-disclaimer { margin-top: 56px; display: flex; gap: 12px; padding: 16px 20px; border-radius: 16px; background: var(--surface-2); color: var(--ink-2); font-size: 14.5px; line-height: 1.7; }
@media (max-width: 680px) {
  .tl-item { grid-template-columns: 26px minmax(0, 1fr); }
  .tl-item::before { left: 8px; top: 20px; }
  .tl-node { grid-column: 1; grid-row: 1 / 3; margin: 6px 0 0 0; }
  .tl-year { grid-column: 2; text-align: left; padding: 0 0 6px 4px; font-size: 17px; }
  .tl-card { grid-column: 2; }
}

.order-wrap { max-width: 780px; }
.order-list { display: grid; gap: 12px; margin-top: 22px; }
.order-item { display: flex; align-items: center; gap: 14px; padding: 14px 16px; border: 1.5px solid var(--line); border-radius: 18px; background: var(--surface); box-shadow: var(--shadow-sm); transition: border-color .2s, background .2s, transform .3s var(--ease); }
.order-item .pos { flex: none; width: 30px; height: 30px; border-radius: 10px; background: var(--surface-2); display: grid; place-items: center; font-weight: 600; font-size: 14px; color: var(--ink-2); }
.order-item .txt { flex: 1; min-width: 0; }
.order-item .txt b { display: block; font-size: 15.5px; line-height: 1.5; }
.order-item .txt small { color: var(--ink-2); font-size: 13.5px; }
.order-item .mv { display: grid; gap: 4px; }
.order-item .mv button { width: 34px; height: 30px; border-radius: 9px; border: 1px solid var(--line); background: var(--surface); display: grid; place-items: center; color: var(--ink-2); }
.order-item .mv button:hover:not([disabled]) { border-color: var(--sage); color: var(--sage-d); }
.order-item .mv button[disabled] { opacity: .35; cursor: default; }
.order-item .yr { font-family: var(--font-serif); font-weight: 600; color: var(--ink-2); }
.order-item.is-ok { border-color: var(--ok); background: var(--ok-l); }
.order-item.is-bad { border-color: var(--bad); background: var(--bad-l); }

/* ───────── Midterm ───────── */
.mid-top { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 24px; align-items: center; padding: clamp(20px, 3.5vw, 30px); margin-bottom: 26px; }
.mid-top .bar { margin-top: 10px; }
.mid-top h2 { font-size: 20px; }
.mid-top p { color: var(--ink-2); font-size: 15px; margin-top: 4px; }
@media (max-width: 720px) { .mid-top { grid-template-columns: 1fr; } }
.acc { display: grid; gap: 14px; margin-top: 22px; }
.acc-item { background: var(--surface); border: 1px solid var(--line-2); border-radius: 20px; box-shadow: var(--shadow-sm); overflow: hidden; transition: box-shadow .3s; }
.acc-item.is-open { box-shadow: var(--shadow); }
.acc-head { display: flex; align-items: center; gap: 16px; width: 100%; padding: 16px 20px; text-align: left; }
.acc-n { flex: none; width: 40px; height: 40px; border-radius: 13px; background: var(--t-l); color: var(--t-d); display: grid; place-items: center; font-weight: 600; }
.acc-item.is-done .acc-n { background: var(--sage-d); color: #fff; }
.acc-q { flex: 1; min-width: 0; font-family: var(--font-serif); font-weight: 600; font-size: 17px; line-height: 1.5; }
.acc-q small { display: block; margin-top: 4px; font-family: var(--font-sans); font-weight: 400; font-size: 13px; color: var(--ink-2); }
.acc-chev { flex: none; color: var(--ink-3); transition: transform .3s var(--ease); }
.acc-item.is-open .acc-chev { transform: rotate(180deg); }
.acc-panel { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .45s var(--ease); }
.acc-item.is-open .acc-panel { grid-template-rows: 1fr; }
.acc-panel > div { overflow: hidden; min-height: 0; }
.acc-body { padding: 4px 24px 26px 76px; }
@media (max-width: 640px) { .acc-body { padding: 4px 18px 22px; } .acc-head { padding: 14px; gap: 12px; } }
.acc-body textarea {
  width: 100%; min-height: 128px; border: 1.5px solid var(--line); border-radius: 16px; padding: 14px 16px; font: inherit; font-size: 15.5px; line-height: 1.7;
  resize: vertical; background: var(--bg); color: var(--ink);
}
.acc-body textarea:focus { outline: none; border-color: var(--sage); background: #fff; }
.acc-body .lbl { font-size: 14px; font-weight: 600; margin-bottom: 8px; display: flex; gap: 8px; align-items: center; }
.acc-body .small { font-size: 13px; color: var(--ink-3); margin-top: 6px; }
.acc-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
.answer { margin-top: 22px; padding: 20px 22px; border-radius: 18px; background: var(--t-l); animation: rise .4s var(--ease) both; }
.answer .lead { font-size: 16.5px; line-height: 1.8; margin-bottom: 4px; }
.key-points { list-style: none; display: grid; gap: 8px; margin-top: 14px; }
.kp { display: flex; gap: 12px; align-items: flex-start; padding: 11px 14px; border-radius: 14px; background: rgba(255, 255, 255, .7); cursor: pointer; font-size: 15.5px; line-height: 1.7; transition: background .2s; }
.kp:hover { background: rgba(255, 255, 255, .95); }
.kp input { flex: none; width: 20px; height: 20px; margin-top: 4px; accent-color: var(--sage-d); }
.kp.is-checked { background: #fff; }
.kp-score { margin-top: 14px; font-weight: 600; font-size: 14.5px; display: flex; align-items: center; gap: 8px; color: var(--t-d); }

/* ───────── Small screens & touch ───────── */
@media (max-width: 480px) {
  .fc-actions { flex-wrap: nowrap; gap: 8px; }
  .fc-actions .btn:not(.btn-icon) { padding-inline: 14px; }
}
@media (hover: none) {
  .kbd-hint { display: none; }
  .match-help span::after { content: none; }
}

@media (max-width: 400px) {
  .tab { min-width: 0; white-space: normal; line-height: 1.3; padding: 8px 4px; }
  .setup-card .select { width: 100%; }
}
.setup-card .select { max-width: 100%; }