/* ---------------------------------------------------------------
   VocabFlip — a card-catalog / paper index-card aesthetic
   Palette: khaki paper, deep ink navy, library-stamp red, ochre
----------------------------------------------------------------*/

:root {
  --paper: #ece7da;
  --paper-raised: #f5f1e6;
  --paper-dark: #ddd5be;
  --ink: #202b3d;
  --ink-soft: #55607a;
  --ink-faint: #8891a3;
  --stamp: #a63446;
  --stamp-dark: #85293a;
  --ochre: #c98a2c;
  --card-back: #1b2a44;
  --card-back-text: #ece7da;
  --line: rgba(32, 43, 61, 0.16);
  --line-strong: rgba(32, 43, 61, 0.28);
  --shadow: 0 1px 0 rgba(32, 43, 61, 0.06), 0 8px 20px -12px rgba(32, 43, 61, 0.35);
  --font-display: "Source Serif 4", Georgia, serif;
  --font-body: "IBM Plex Sans", -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --font-zh: "Noto Serif SC", "PingFang SC", serif;
  --radius: 3px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px);
  background-size: 100% 32px;
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.5;
}

a { color: inherit; }

::selection { background: var(--stamp); color: var(--paper); }

/* ---------------- Header / Footer ---------------- */

.site-header {
  border-bottom: 3px double var(--ink);
  background: var(--paper-raised);
}
.site-header__inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--ink); }
.brand__mark {
  font-family: var(--font-zh);
  font-size: 28px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--ink);
  border-radius: 50%;
  color: var(--stamp);
  flex: none;
}
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__title { font-family: var(--font-display); font-weight: 700; font-size: 22px; }
.brand__sub { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.12em; color: var(--ink-soft); }
.site-nav { display: flex; gap: 22px; font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.04em; }
.site-nav a { text-decoration: none; border-bottom: 1px solid transparent; padding-bottom: 2px; }
.site-nav a:hover { border-color: var(--stamp); color: var(--stamp); }

.site-footer {
  border-top: 3px double var(--ink);
  margin-top: 60px;
  background: var(--paper-raised);
}
.site-footer__inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
}

/* ---------------- Hero ---------------- */

.hero { padding: 64px 24px 40px; }
.hero__inner { max-width: 780px; margin: 0 auto; text-align: center; }
.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--stamp);
  margin: 0 0 18px;
}
.hero__title { margin: 0 0 22px; display: flex; flex-direction: column; gap: 4px; }
.hero__en {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(36px, 6vw, 58px);
  letter-spacing: -0.01em;
}
.hero__zh {
  font-family: var(--font-zh);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 30px);
  color: var(--ink-soft);
}
.hero__desc { font-size: 17px; color: var(--ink-soft); max-width: 56ch; margin: 0 auto 30px; }
.hero__actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.btn {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  text-decoration: none;
  padding: 12px 22px;
  border-radius: var(--radius);
  border: 1.5px solid var(--ink);
  display: inline-block;
}
.btn--primary { background: var(--ink); color: var(--paper); }
.btn--primary:hover { background: var(--stamp); border-color: var(--stamp); }
.btn--ghost { background: transparent; color: var(--ink); }
.btn--ghost:hover { border-color: var(--stamp); color: var(--stamp); }

/* ---------------- Drawer label / section header ---------------- */

.drawer, .preview, .search-page { max-width: 1180px; margin: 0 auto; padding: 0 24px 48px; }
.drawer__label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 10px;
  margin: 8px 0 26px;
}
.drawer__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 22px;
}
.drawer__count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
}

/* ---------------- Card grid ---------------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
}
@media (max-width: 980px) { .card-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 640px) { .card-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; } }

/* ---------------- Flip card ---------------- */

.flip-card {
  appearance: none;
  border: none;
  background: none;
  padding: 0;
  cursor: pointer;
  perspective: 1200px;
  width: 100%;
  aspect-ratio: 3 / 4;
  font: inherit;
  color: inherit;
  text-align: left;
}
.flip-card__inner {
  position: relative;
  width: 100%;
  height: 100%;
  display: block;
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}
.flip-card:hover .flip-card__inner,
.flip-card:focus-visible .flip-card__inner,
.flip-card.is-flipped .flip-card__inner {
  transform: rotateY(180deg);
}
.flip-card:focus-visible { outline: 2px solid var(--stamp); outline-offset: 4px; }

.flip-card__face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow);
}

.flip-card__face--front {
  background:
    repeating-linear-gradient(var(--paper-raised) 0 27px, var(--line) 27px 28px);
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--ink);
}
.flip-card__face--back {
  background: var(--card-back);
  color: var(--card-back-text);
  transform: rotateY(180deg);
  border: 1px solid var(--card-back);
  border-left: 4px solid var(--ochre);
  justify-content: center;
  align-items: flex-start;
}

.card-index {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-faint);
}
.card-tag {
  position: absolute;
  top: 12px;
  right: 10px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.05em;
  color: var(--stamp);
  border: 1px solid var(--stamp);
  border-radius: 999px;
  padding: 2px 7px;
  transform: rotate(3deg);
  max-width: 60%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.card-word {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2vw, 23px);
  margin-top: auto;
  word-break: break-word;
}
.card-phonetic {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
  margin-top: 4px;
}
.card-hint {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  margin-top: 10px;
}

.card-pos {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.05em;
  color: var(--ochre);
  margin-bottom: 8px;
}
.card-translation {
  font-family: var(--font-zh);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.5;
}
.card-word--back {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  color: rgba(236, 231, 218, 0.55);
  font-weight: 400;
}

/* ---------------- Pagination ---------------- */

.pager {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--line-strong);
  flex-wrap: wrap;
}
.pager__btn {
  font-family: var(--font-mono);
  font-size: 12px;
  text-decoration: none;
  padding: 8px 14px;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  color: var(--ink);
}
.pager__btn:hover { background: var(--ink); color: var(--paper); }
.pager__btn[aria-disabled="true"] { opacity: 0.3; pointer-events: none; }
.pager__status {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
  display: flex;
  align-items: center;
  gap: 6px;
}
.pager__jump {
  width: 56px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 6px 4px;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--paper-raised);
  color: var(--ink);
}

/* ---------------- Search page ---------------- */

.search-page__hint { color: var(--ink-soft); max-width: 60ch; margin: 0 0 24px; }

#search input[type="text"] {
  font-family: var(--font-body);
  border: 1.5px solid var(--ink);
  border-radius: var(--radius);
  background: var(--paper-raised);
}
#search .pagefind-ui__button {
  font-family: var(--font-mono);
  background: var(--ink);
  border-radius: var(--radius);
}
#search .pagefind-ui__result {
  border-bottom: 1px solid var(--line);
  font-family: var(--font-body);
}
#search .pagefind-ui__result-title { font-family: var(--font-display); }
#search mark { background: rgba(201, 138, 44, 0.35); color: inherit; }

@media (prefers-reduced-motion: reduce) {
  .flip-card__inner { transition: none; }
}