.flashcards-section { margin-top: 24px; }
.material-studio { margin: 0 0 16px; padding: clamp(16px, 2vw, 22px); border: 1px solid var(--line); border-radius: 16px; background: color-mix(in srgb, var(--white) 94%, #e5f2e7 6%); }
.material-studio-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; margin-bottom: 16px; }
.material-studio-heading h3 { margin: 5px 0 3px; color: var(--ink); font: 750 17px/1.3 var(--display); }
.material-studio-heading p { margin: 0; color: var(--muted); font-size: 11px; line-height: 1.55; }
.material-studio-icon { display: grid; width: 38px; height: 38px; flex: none; place-items: center; border-radius: 12px; color: #347b5b; background: #e2f0e2; font-size: 19px; }
.material-studio-controls { display: grid; grid-template-columns: auto minmax(190px, .7fr) minmax(240px, 1.4fr) auto; align-items: center; gap: 11px; }
.material-studio-controls>label:first-child { color: var(--muted); font-size: 10px; font-weight: 700; }
.material-studio-controls select { min-height: 42px; width: 100%; padding: 0 11px; border: 1px solid var(--line); border-radius: 10px; color: var(--ink); background: var(--white); font: 600 10px var(--font); }
.material-dropzone { position: relative; display: flex; min-height: 68px; align-items: center; gap: 11px; padding: 10px 13px; border: 1.5px dashed #a9c7ad; border-radius: 12px; color: var(--ink); background: var(--white); cursor: pointer; transition: border-color .18s, background .18s, transform .18s; }
.material-dropzone:hover, .material-dropzone.is-dragging { border-color: #347b5b; background: #eff7ef; }
.material-dropzone.is-dragging { transform: scale(1.01); }
.material-dropzone input { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; clip-path: inset(50%); }
.material-dropzone:focus-within { outline: 3px solid #347b5b55; outline-offset: 2px; }
.material-drop-icon { display: grid; width: 34px; height: 34px; flex: none; place-items: center; border-radius: 10px; color: #347b5b; background: #e8f2e6; font-size: 20px; }
.material-dropzone strong, .material-dropzone small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.material-dropzone strong { font-size: 10px; }
.material-dropzone small { margin-top: 4px; color: var(--muted); font-size: 9px; }
.material-generate { min-height: 42px; padding: 0 15px; border: 0; border-radius: 10px; color: #fff; background: #347b5b; font: 700 10px var(--font); cursor: pointer; white-space: nowrap; }
.material-generate:disabled { cursor: not-allowed; opacity: .48; }
.material-privacy, .material-status { margin: 9px 0 0; color: var(--muted); font-size: 9px; line-height: 1.5; }
.material-status:not(:empty) { color: #347b5b; font-weight: 650; }
.material-results { margin-top: 13px; padding: 13px 15px; border: 1px solid var(--line); border-radius: 12px; background: var(--white); }
.material-results[hidden] { display: none; }
.material-results h4 { margin: 0 0 4px; color: var(--ink); font: 700 12px var(--display); }
.material-results p { margin: 0 0 7px; color: var(--muted); font-size: 10px; }
.material-results ol { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px 22px; margin: 0; padding-left: 20px; color: var(--ink); font-size: 10px; line-height: 1.45; }
.flashcards-section[hidden], .flashcard[hidden], .flashcard-answer[hidden], .flashcard-rating[hidden], .flashcards-complete[hidden] { display: none !important; }
.flashcards-heading { align-items: center; margin-bottom: 14px; }
.flashcards-heading p { margin: 6px 0 0; color: var(--muted); font-size: 10px; }
.flashcards-streak { display: grid; min-width: 76px; min-height: 76px; place-items: center; border: 7px solid #e2f0e2; border-radius: 50%; color: #347b5b; background: var(--white); font: 800 14px var(--display); }
.flashcards-toolbar { display: grid; grid-template-columns: auto minmax(220px, 320px) 1fr; align-items: center; gap: 10px; margin: 0 0 14px; padding: 13px 15px; border: 1px solid var(--line); border-radius: 13px; background: var(--white); }
.flashcards-toolbar label { color: var(--muted); font-size: 10px; font-weight: 700; }
.flashcards-toolbar select { min-height: 38px; width: 100%; padding: 0 11px; border: 1px solid var(--line); border-radius: 9px; color: var(--ink); background: var(--white); font: 600 10px var(--font); }
.flashcards-toolbar>span { justify-self: end; color: var(--muted); font-size: 9px; }
.flashcards-layout { display: grid; grid-template-columns: minmax(280px, .82fr) minmax(0, 1.18fr); align-items: stretch; gap: 14px; }
.flashcards-path-card, .flashcards-session-card { min-width: 0; border: 1px solid var(--line); border-radius: 16px; background: var(--white); }
.flashcards-path-card { padding: 17px 18px 20px; }
.flashcards-card-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.flashcards-card-heading h3 { margin: 5px 0 0; color: var(--ink); font: 750 15px/1.3 var(--display); }
.flashcards-path-mark { display: grid; place-items: center; width: 34px; height: 34px; flex: none; border-radius: 11px; color: #347b5b; background: #e8f2e6; }
.flashcards-trail { position: relative; display: flex; flex-direction: column; align-items: stretch; gap: 6px; padding: 14px 0 0; }
.flashcards-trail::before { position: absolute; top: 35px; bottom: 35px; left: 28px; z-index: 0; width: 3px; border-radius: 4px; background: repeating-linear-gradient(to bottom, #dce9dc 0 7px, transparent 7px 13px); content: ''; }
.flashcard-step { position: relative; z-index: 1; display: grid; grid-template-columns: 38px minmax(0, 1fr) auto; align-items: center; gap: 9px; width: 100%; min-height: 56px; padding: 6px 10px; border: 1px solid transparent; border-radius: 13px; color: var(--muted); background: transparent; text-align: left; cursor: pointer; transition: background .18s, border-color .18s; }
.flashcard-step:hover:not(:disabled) { border-color: var(--line); background: color-mix(in srgb, var(--white) 88%, #e7f2e6 12%); }
.flashcard-step:disabled { cursor: not-allowed; opacity: .48; }
.flashcard-step.is-current { color: var(--ink); }
.flashcard-step.is-done { color: #347b5b; }
.flashcard-step.is-current .flashcard-step-node { color: #fff; background: #347b5b; box-shadow: 0 5px 12px #347b5b35; }
.flashcard-step.is-done .flashcard-step-node { color: #fff; background: #78ad7d; }
.flashcard-step-node { display: grid; width: 36px; height: 36px; place-items: center; border: 3px solid var(--white); border-radius: 50%; color: #829384; background: #e8eee7; box-shadow: 0 0 0 1px var(--line); font-size: 12px; font-weight: 800; }
.flashcard-step-copy { min-width: 0; }
.flashcard-step-copy b, .flashcard-step-copy small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.flashcard-step-copy b { color: inherit; font-size: 9px; }
.flashcard-step-copy small { margin-top: 3px; color: var(--muted); font-size: 8px; }
.flashcard-step-status { font-size: 12px; font-weight: 800; }
.flashcards-session-card { display: flex; flex-direction: column; justify-content: center; padding: clamp(18px, 3vw, 30px); background: color-mix(in srgb, var(--white) 88%, #e8f2e6 12%); }
.flashcard-empty-state, .flashcards-complete { display: grid; justify-items: center; gap: 9px; min-height: 250px; align-content: center; text-align: center; }
.flashcard-empty-state>span, .flashcards-complete>span { display: grid; place-items: center; width: 54px; height: 54px; border-radius: 18px; color: #347b5b; background: #e2f0e2; font-size: 26px; }
.flashcard-empty-state h3, .flashcards-complete h3 { margin: 4px 0 0; color: var(--ink); font: 750 19px/1.3 var(--display); }
.flashcard-empty-state p, .flashcards-complete p { max-width: 360px; margin: 0; color: var(--muted); font-size: 10px; line-height: 1.6; }
.flashcards-complete button { min-height: 39px; margin-top: 7px; padding: 0 15px; border: 0; border-radius: 10px; color: #fff; background: #347b5b; font: 700 10px var(--font); cursor: pointer; }
.flashcard { width: 100%; }
.flashcard-topline { display: flex; justify-content: space-between; gap: 10px; color: #347b5b; font-size: 9px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.flashcard-topline span:last-child { color: var(--muted); letter-spacing: 0; text-transform: none; }
.flashcard-face { display: grid; gap: 18px; min-height: 255px; align-content: center; margin: 14px 0; padding: clamp(18px, 3vw, 28px); border: 1px solid var(--line); border-radius: 15px; background: var(--white); box-shadow: 0 10px 28px #173c2c0c; }
.flashcard-prompt-label { color: #578d67; font-size: 8px; font-weight: 800; letter-spacing: .12em; }
.flashcard-face h3 { margin: 9px 0 0; color: var(--ink); font: 700 clamp(15px, 2vw, 20px)/1.55 var(--font); }
.flashcard-answer { padding-top: 15px; border-top: 1px solid var(--line); }
.flashcard-answer strong { display: block; margin-top: 7px; color: #347b5b; font-size: 14px; line-height: 1.5; }
.flashcard-answer p { margin: 8px 0 0; color: var(--muted); font-size: 10px; line-height: 1.65; }
.flashcard-actions button { min-height: 42px; padding: 0 14px; border-radius: 10px; font: 700 10px var(--font); cursor: pointer; }
.flashcard-reveal, .flashcard-known { border: 0; color: #fff; background: #347b5b; }
.flashcard-rating { display: flex; gap: 9px; }
.flashcard-rating button { flex: 1; }
.flashcard-again { border: 1px solid #d5e4d5; color: #347b5b; background: var(--white); }
@media (max-width: 900px) { .flashcards-layout { grid-template-columns: minmax(250px, .9fr) minmax(0, 1.1fr); } }
@media (max-width: 760px) { .material-studio-controls { grid-template-columns: auto minmax(0, 1fr); } .material-studio-controls>label:first-child { grid-column: 1; } .material-studio-controls select { grid-column: 2; } .material-dropzone { grid-column: 1 / -1; } .material-generate { grid-column: 1 / -1; } }
@media (max-width: 680px) { .flashcards-toolbar { grid-template-columns: 1fr; gap: 7px; } .flashcards-toolbar>span { justify-self: start; } .flashcards-layout { grid-template-columns: 1fr; } .flashcards-path-card { order: 2; } .flashcards-session-card { order: 1; } .flashcards-trail { display: flex; flex-direction: column; } .flashcards-trail::before { display: block; left: 28px; } .flashcard-step { width: 100%; } .flashcards-streak { min-width: 62px; min-height: 62px; border-width: 5px; font-size: 11px; } .material-results ol { grid-template-columns: 1fr; } }
.flashcard-flip{position:relative;min-height:255px;margin:14px 0;perspective:1000px;transform-style:preserve-3d;transition:transform .52s cubic-bezier(.2,.7,.2,1);cursor:pointer;outline:none}.flashcard-flip.is-flipped{transform:rotateY(180deg)}.flashcard-flip:focus-visible .flashcard-face{outline:3px solid #78ad7d;outline-offset:3px}.flashcard-face{position:absolute;inset:0;display:grid;grid-template-rows:1fr auto;align-content:stretch;gap:14px;min-height:0;height:100%;margin:0;padding:clamp(18px,3vw,28px);backface-visibility:hidden;-webkit-backface-visibility:hidden}.flashcard-face-front{transform:rotateY(0);}.flashcard-face-back{transform:rotateY(180deg);}.flashcard-tap-hint{color:var(--muted);font-size:9px;font-weight:600}.flashcard-face-back .flashcard-tap-hint{text-align:right}.flashcard-face-back>div{align-self:center}.flashcard-face-back strong{display:block;margin-top:8px}.flashcard-face-back p{margin-top:9px}
@media(max-width:680px){.flashcard-flip{min-height:240px}}
@media(prefers-reduced-motion:reduce){.flashcard-flip{transition:none}}