/* cards.css — стиль под custom.css сайта */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --font:      Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  --ls:        -0.03rem;

  --bg:        #f5f7f9;
  --surface:   #ffffff;
  --surface2:  #eef2f5;
  --border:    #d9dde2;

  --front:     #1694CA;   /* акцент 1 — лицевая сторона карточки */
  --back:      #1383B3;   /* акцент 2 — обратная сторона карточки */
  --accent:    #1694CA;   /* основной акцент */
  --hover:     #1383B3;   /* hover */
  --known:     #38424D;   /* "выучено" — графитовый */
  --card-front-bg: #1383B3;
  --card-back-bg:  #38424D;
  --text-card: #ffffff;   /* текст на тёмной карточке */
  --text:      #111111;
  --muted:     rgba(255, 255, 255, 0.5);

  --radius:    4px;
  --shadow:    0 2px 10px rgba(56,66,77,.10);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  letter-spacing: var(--ls);
  font-weight: 400;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── HEADER ───────────────────────────────────────── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  padding: 12px 24px;
  border-bottom: 3px solid var(--front);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 4px rgba(0,0,0,.08);
}

.logo {
  font-family: var(--font);
  font-size: 1.2em;
  font-weight: 700;
  letter-spacing: var(--ls);
  text-transform: uppercase;
  color: var(--front);
}

.controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* ── BUTTONS ──────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text);
  font-family: var(--font);
  letter-spacing: var(--ls);
  font-size: .85em;
  font-weight: 400;
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
  -webkit-user-select: none;
  user-select: none;
}
.btn:hover  { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn:active { opacity: .85; }

.btn.active {
  background: var(--front);
  border-color: var(--front);
  color: #fff;
}
.btn.active:hover {
  background: var(--hover);
  border-color: var(--hover);
}

.btn-accent {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 700;
}
.btn-accent:hover { background: var(--hover); border-color: var(--hover); }

.btn svg { flex-shrink: 0; }

/* ── STATS BAR ────────────────────────────────────── */
.stats-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  padding: 10px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  font-size: .85em;
  color: var(--muted);
}

.progress-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  max-width: 400px;
}
.progress-bar {
  flex: 1;
  height: 6px;
  background: var(--surface2);
  border-radius: 99px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.progress-fill {
  height: 100%;
  background: var(--known);
  transition: width .4s ease;
}

.counter { white-space: nowrap; font-weight: 700; color: var(--text); }

/* ── MAIN AREA ────────────────────────────────────── */
main {
  padding: 20px 24px 60px;
}

/* ── RIBBON MODE ──────────────────────────────────── */
#ribbon-view {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(560px, 1fr));
  gap: 16px;
}

/* ── FLIP MODE ────────────────────────────────────── */
#flip-view {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.flip-stage {
  width: 100%;
  /* вдвое шире: было 560px, стало 1120px */
  max-width: 1120px;
  perspective: 1200px;
}

/* ── CARD COMPONENT ───────────────────────────────── */
.card-wrapper {
  width: 100%;
  aspect-ratio: 16/8;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

#ribbon-view .card-wrapper {
  aspect-ratio: 16/8;
}

.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform .6s cubic-bezier(.4, 0, .2, 1);
  border-radius: var(--radius);
}

.card-wrapper.flipped .card-inner {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 20px 32px 16px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  overflow: hidden;
  box-shadow: var(--shadow);
}

/* тонкая полоса сверху — как у .flip .front:before на сайте */
.card-face::before {
  content: "перевернуть";
  position: absolute;
  top: 0; left: 0; right: 0;
  font-size: .75em;
  color: rgba(255,255,255,.75);
  padding: 4px 10px;
  background: rgba(0,0,0,.18);
  border-radius: var(--radius) var(--radius) 0 0;
  border-bottom: 1px solid rgba(255,255,255,.12);
}

.card-back::before { content: "перевернуть назад"; }

.card-front {
  background: var(--card-front-bg);
  border: 1px solid var(--card-front-bg);
  border-top: 3px solid var(--front);
  color: #ffffff;
}
.card-back  {
  background: var(--card-back-bg);
  border: 1px solid var(--card-back-bg);
  border-top: 3px solid var(--back);
  color: #ffffff;
  transform: rotateY(180deg);
}

.card-label {
  font-size: .68em;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
  margin-top: 14px;
}

.card-front .card-label { color: rgba(255,255,255,.85); }
.card-back  .card-label { color: rgba(255,255,255,.7); }

.card-text {
  font-size: clamp(.85em, 1.7vw, 1em);
  font-weight: 700;
  line-height: 1.3;
  color: #ffffff;
  word-break: break-word;
  flex: 1;
  display: flex;
  align-items: center;
}

.card-back .card-text {
  font-size: clamp(.85em, 1.7vw, 1em);
  font-weight: 400;
}

.card-hint {
  font-size: .7em;
  color: var(--muted);
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 4px;
  align-self: flex-end;
}

/* ── KNOWN STATE ──────────────────────────────────── */
.card-wrapper.known .card-front,
.card-wrapper.known .card-back {
  background: var(--surface2);
  border-top-color: var(--known);
  opacity: .85;
}
.card-wrapper.known .card-text { color: var(--known); }

.known-badge {
  position: absolute;
  top: 10px;
  right: 10px;
  background: var(--known);
  color: #fff;
  font-size: .62em;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: 2px 10px;
  border-radius: 100px;
  z-index: 2;
  animation: pop .22s cubic-bezier(.34,1.56,.64,1) both;
}

@keyframes pop {
  from { transform: scale(0); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}

/* ── CARD ACTIONS (ribbon) ────────────────────────── */
.card-actions {
  position: absolute;
  bottom: 10px;
  right: 10px;
  display: flex;
  gap: 6px;
  z-index: 5;
  opacity: 0;
  transition: opacity .2s;
}

.card-wrapper:hover .card-actions { opacity: 1; }
.card-wrapper.known  .card-actions { opacity: 1; }

.card-act-btn {
  height: 26px;
  padding: 0 10px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--known);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font);
  font-size: .68em;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  transition: background .15s, transform .1s;
  -webkit-tap-highlight-color: transparent;
}
.card-act-btn:hover  { background: var(--accent); border-color: var(--accent); color: #fff; }
.card-act-btn:active { transform: scale(.93); }

/* ── FLIP NAVIGATOR ───────────────────────────────── */
.flip-nav {
  display: flex;
  align-items: center;
  gap: 12px;
}

.flip-nav .btn {
  width: 44px;
  height: 40px;
  padding: 0;
  justify-content: center;
  font-size: 1.1em;
  font-weight: 700;
}

.flip-nav .btn:disabled {
  opacity: .3;
  cursor: default;
  pointer-events: none;
}

.flip-counter {
  font-size: .9em;
  color: var(--muted);
  min-width: 70px;
  text-align: center;
  font-weight: 700;
}

.flip-known-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 22px;
  border-radius: var(--radius);
  border: 2px solid var(--known);
  background: transparent;
  color: var(--known);
  font-family: var(--font);
  letter-spacing: var(--ls);
  font-size: .9em;
  font-weight: 700;
  text-transform: uppercase;
  cursor: pointer;
  transition: background .15s, color .15s;
  -webkit-tap-highlight-color: transparent;
}
.flip-known-btn:hover    { background: var(--known); color: #fff; }
.flip-known-btn:active   { opacity: .85; }
.flip-known-btn.is-known { background: var(--known); color: #fff; }

/* ── EMPTY / DONE ─────────────────────────────────── */
.all-done {
  text-align: center;
  padding: 60px 20px;
}
.all-done h2 {
  font-size: 1.4em;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--front);
  margin-bottom: 10px;
  display: block;
}
.all-done p { color: var(--muted); margin-bottom: 20px; }

/* ── HIDDEN ───────────────────────────────────────── */
.hidden { display: none !important; }

/* ── ENTER ANIMATION ──────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.card-wrapper { animation: fadeUp .3s ease both; }

#ribbon-view .card-wrapper:nth-child(1) { animation-delay: .03s; }
#ribbon-view .card-wrapper:nth-child(2) { animation-delay: .06s; }
#ribbon-view .card-wrapper:nth-child(3) { animation-delay: .09s; }
#ribbon-view .card-wrapper:nth-child(4) { animation-delay: .12s; }
#ribbon-view .card-wrapper:nth-child(5) { animation-delay: .15s; }
#ribbon-view .card-wrapper:nth-child(6) { animation-delay: .18s; }

/* ── FILTER ROW ───────────────────────────────────── */
.filter-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 0 14px;
}

/* ── RESPONSIVE ───────────────────────────────────── */
/* Планшеты: карточки в 2 колонки */
@media (min-width: 577px) and (max-width: 1024px) {
  body       { font-size: 0.8em; }
  #ribbon-view {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }
  .flip-stage { max-width: 100%; }
  .card-wrapper,
  #ribbon-view .card-wrapper { aspect-ratio: 16/9; }
}

@media (max-width: 1024px) {
  header     { padding: 10px 14px; }
  main       { padding: 14px 12px 50px; }
  .stats-bar { padding: 8px 14px; }
}

/* Мобильные: одна колонка */
@media (max-width: 576px) {
  body       { font-size: 1.1em; }
  .btn       { padding: 5px 10px; font-size: .8em; }
  .card-text { font-size: 0.8em; }
  #ribbon-view { grid-template-columns: 1fr; gap: 12px; }
  .flip-stage  { max-width: 100%; }
  .card-wrapper,
  #ribbon-view .card-wrapper { aspect-ratio: 16/11; }
}