:root {
  color-scheme: light;
  --paper: #f5f3ee;
  --surface: #fffefa;
  --ink: #202722;
  --muted: #667068;
  --line: #dcded6;
  --accent: #216b4d;
  --accent-dark: #174d38;
  --accent-soft: #dfeee5;
  --warm: #a95132;
  --warm-soft: #f4e5de;
  --shadow: 0 18px 50px rgba(37, 49, 40, .09);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
}
* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; background: var(--paper); color: var(--ink); line-height: 1.5; }
button, input, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: var(--accent-dark); }
button { cursor: pointer; }
button:disabled { opacity: .55; cursor: wait; }
:focus-visible { outline: 3px solid #b56b22; outline-offset: 3px; }
[hidden] { display: none !important; }
.skip-link { position: fixed; inset-block-start: 8px; inset-inline-start: 8px; z-index: 20; padding: 10px; background: white; transform: translateY(-150%); }
.skip-link:focus { transform: none; }
.site-header { max-width: 1120px; margin: auto; padding: 22px clamp(18px, 4vw, 44px); display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 750; font-size: 1.1rem; text-decoration: none; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 38px; border: 2px solid var(--accent); border-radius: 7px; color: var(--accent); font-family: Georgia, serif; font-size: 1.4rem; transform: rotate(-4deg); }
#account { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: .9rem; }
main { width: min(1032px, calc(100% - 36px)); margin: 0 auto; padding: 24px 0 64px; }
h1, h2, h3, p { margin-block-start: 0; }
h1 { max-width: 760px; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2.15rem, 5vw, 4rem); font-weight: 500; line-height: 1.08; letter-spacing: -.035em; margin-block-end: 16px; }
h2 { font-family: Georgia, "Times New Roman", serif; font-size: clamp(1.55rem, 3vw, 2.1rem); font-weight: 500; line-height: 1.15; }
h3 { font-size: 1rem; }
.lead { color: var(--muted); font-size: 1.05rem; max-width: 650px; }
.muted, .hint { color: var(--muted); }
.hint { font-size: .88rem; margin: 0; }
.row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.row-between { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; }
.stack { display: flex; flex-direction: column; gap: 20px; }
.section { margin-block-start: 38px; }
.btn { min-height: 48px; border: 1px solid var(--line); border-radius: 12px; padding: 10px 18px; background: var(--surface); color: var(--ink); font-weight: 650; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; gap: 8px; }
.btn:hover { border-color: #a9afa8; background: #fafaf6; }
.btn-primary { color: white; background: var(--accent); border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); }
.btn-danger { color: var(--warm); }
.btn-quiet { background: transparent; border-color: transparent; color: var(--muted); }
.btn-small { min-height: 40px; padding: 7px 12px; font-size: .9rem; }
.hero { padding: clamp(20px, 6vw, 70px) 0 28px; }
.auth-card { max-width: 480px; margin: 30px auto; padding: clamp(22px, 5vw, 38px); border: 1px solid var(--line); border-radius: 22px; background: var(--surface); box-shadow: var(--shadow); }
.field { display: flex; flex-direction: column; gap: 6px; margin-block-end: 16px; }
.field label { font-size: .9rem; font-weight: 650; }
input, textarea { width: 100%; min-height: 48px; border: 1px solid #bfc5be; border-radius: 10px; background: white; color: var(--ink); padding: 11px 13px; font-size: 1rem; }
textarea { min-height: 110px; resize: vertical; line-height: 1.45; }
input:user-invalid, textarea:user-invalid { border-color: var(--warm); }
.form-error { min-height: 24px; color: var(--warm); }
.visually-hidden { position: absolute !important; clip-path: inset(50%) !important; overflow: hidden !important; width: 1px !important; height: 1px !important; margin: -1px !important; padding: 0 !important; border: 0 !important; white-space: nowrap !important; }
.deck-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 16px; padding: 0; list-style: none; }
.deck-tile { min-height: 190px; padding: 22px; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); display: flex; flex-direction: column; justify-content: space-between; transition: transform 160ms, box-shadow 160ms; }
.deck-tile:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.deck-tile h2 { font-size: 1.55rem; margin-block-end: 10px; }
.deck-tile a { color: inherit; text-decoration: none; }
.deck-tile a::after { content: ""; position: absolute; }
.progress-line { height: 7px; background: #e5e7e1; border-radius: 20px; overflow: hidden; flex: 1; }
.progress-line > span { display: block; height: 100%; background: var(--accent); border-radius: inherit; transition: width 180ms; }
.empty { padding: 44px 24px; border: 1px dashed #b7beb5; border-radius: 18px; text-align: center; }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: clamp(18px, 4vw, 30px); }
.import-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 20px; align-items: start; }
.import-text { min-height: 360px; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: .92rem; }
.example { margin-block-start: 12px; font-size: .85rem; color: var(--muted); }
.example summary { cursor: pointer; min-height: 36px; }
.example pre { white-space: pre-wrap; }
.preview-list, .cards-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.preview-list { max-height: 510px; overflow: auto; }
.preview-item, .card-row { padding: 14px; border: 1px solid var(--line); border-radius: 12px; background: white; }
.preview-item strong { display: block; margin-block-end: 4px; }
.preview-item p { white-space: pre-wrap; margin: 0; color: var(--muted); }
.card-row { display: grid; grid-template-columns: 1fr auto; gap: 12px; }
.card-row p { white-space: pre-wrap; margin-block-end: 8px; }
.card-row p:last-child { margin: 0; }
.card-row .answer { color: var(--muted); }
.card-actions { display: flex; flex-direction: column; gap: 4px; }
.deck-head { margin-block-end: 24px; }
.study-page { max-width: 780px; min-height: calc(100dvh - 170px); margin: auto; display: flex; flex-direction: column; gap: 18px; }
.study-top { display: flex; align-items: center; gap: 12px; }
.study-top .progress-line { min-width: 60px; }
.study-stage { flex: 1; min-height: 360px; display: flex; }
.flashcard-slide { flex: 1; display: flex; position: relative; touch-action: pan-y; overscroll-behavior-x: none; animation: arrive 260ms ease-out backwards; }
.flashcard { flex: 1; min-height: 360px; perspective: 1400px; display: flex; }
.flashcard-inner { flex: 1; position: relative; transform-style: preserve-3d; transition: transform 420ms cubic-bezier(.2,.7,.2,1); cursor: pointer; }
.flashcard[data-flipped="true"] .flashcard-inner { transform: rotateY(180deg); }
.flashcard-face { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 18px; padding: clamp(24px, 6vw, 54px); border: 1px solid var(--line); border-radius: 24px; background: var(--surface); box-shadow: var(--shadow); backface-visibility: hidden; overflow-y: auto; text-align: center; }
.flashcard-face-back { transform: rotateY(180deg); background: var(--accent-soft); }
.flashcard[data-flipped="false"] .flashcard-face-back, .flashcard[data-flipped="true"] .flashcard-face:not(.flashcard-face-back) { pointer-events: none; }
.card-label { color: var(--muted); font-size: .78rem; font-weight: 750; letter-spacing: .12em; text-transform: uppercase; }
.card-text { white-space: pre-wrap; overflow-wrap: anywhere; font-family: Georgia, "Times New Roman", serif; font-size: clamp(1.45rem, 4vw, 2.25rem); line-height: 1.28; }
.flashcard-slide::after { position: absolute; z-index: 2; inset-block-start: 18px; padding: 6px 12px; border-radius: 8px; font-weight: 750; opacity: var(--drag-force, 0); pointer-events: none; }
.flashcard-slide[data-drag="right"]::after { content: "Знаю"; inset-inline-start: 18px; color: white; background: var(--accent); }
.flashcard-slide[data-drag="left"]::after { content: "Ещё не знаю"; inset-inline-end: 18px; color: var(--warm); background: var(--warm-soft); }
.flashcard-slide[data-leaving="right"] { animation: leave-right 200ms ease-in forwards; }
.flashcard-slide[data-leaving="left"] { animation: leave-left 200ms ease-in forwards; }
.study-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.study-actions .known { background: var(--accent); color: white; border-color: var(--accent); }
.study-hint { text-align: center; margin: 0; }
.summary { max-width: 560px; margin: 8vh auto; padding: clamp(26px, 6vw, 50px); text-align: center; }
.summary-score { font-family: Georgia, serif; color: var(--accent); font-size: clamp(4rem, 15vw, 7rem); line-height: 1; }
dialog { width: min(560px, calc(100% - 28px)); border: 1px solid var(--line); border-radius: 18px; padding: 26px; background: var(--surface); color: var(--ink); box-shadow: var(--shadow); }
dialog::backdrop { background: rgba(25, 32, 27, .48); }
.toast { position: fixed; z-index: 30; inset-inline-start: 50%; inset-block-end: 24px; transform: translate(-50%, 20px); max-width: calc(100% - 32px); padding: 12px 18px; border-radius: 12px; background: var(--ink); color: white; opacity: 0; pointer-events: none; transition: 180ms; }
.toast.visible { opacity: 1; transform: translate(-50%, 0); }
@keyframes arrive { from { opacity: 0; transform: translateY(14px) scale(.98); } }
@keyframes leave-right { to { opacity: 0; transform: translate3d(70%,0,0) rotate(6deg); } }
@keyframes leave-left { to { opacity: 0; transform: translate3d(-70%,0,0) rotate(-6deg); } }
@media (max-width: 760px) {
  .import-layout { grid-template-columns: 1fr; }
  .import-text { min-height: 260px; }
  main { padding-block-start: 8px; }
}
@media (max-width: 480px) {
  .site-header { padding-block: 14px; }
  #account .username { display: none; }
  .study-page { min-height: calc(100dvh - 130px); }
  .study-stage, .flashcard { min-height: 330px; }
  .study-actions .btn { padding-inline: 10px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
}