/* Seal chop — the ONLY surface where cinnabar appears. */
.chop {
  display: inline-grid;
  place-items: center;
  width: 1.6em;
  height: 1.6em;
  font-family: var(--font-sc-serif);
  font-weight: 600;
  font-size: 0.9em;
  line-height: 1;
  color: var(--paper-white);
  background: var(--cinnabar);
  box-shadow: 0 0 0 0.5px rgba(198,61,47,0.8);
  letter-spacing: 0;
  user-select: none;
}
.chop.lg { font-size: 1.1em; }
.chop.sm { font-size: 0.75em; width: 1.4em; height: 1.4em; }

/* Bilingual term — structural three-line stack */
.bilingual-term {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.bilingual-term .en {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: var(--text-md);
  color: var(--ink-black);
  line-height: 1.3;
}
.bilingual-term .zh {
  font-family: var(--font-sc-sans);
  font-size: var(--text-base);
  color: var(--ink-black);
  line-height: 1.4;
}
.bilingual-term .py {
  font-family: var(--font-sans);
  font-style: italic;
  font-size: 0.78em;
  color: var(--ink-soft);
  line-height: 1.3;
  letter-spacing: 0.01em;
}

/* Card — paper rectangle, hairline border, almost no radius. */
.card {
  position: relative;
  background: var(--paper-white);
  border: var(--hairline);
  border-radius: var(--radius-card);
  padding: var(--space-4);
  box-shadow: var(--shadow-card);
}
.card .card-chop { position: absolute; top: var(--space-3); right: var(--space-3); }
.card .title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: var(--text-md);
  margin-bottom: var(--space-1);
}
.card .meta {
  color: var(--ink-soft);
  font-size: var(--text-sm);
}
.card .badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-top: var(--space-3);
}
.badge {
  font-size: var(--text-xs);
  padding: 2px 8px;
  border-radius: var(--radius-chip);
  background: var(--dai-tint);
  color: var(--dai-green);
  letter-spacing: 0.02em;
}
.badge.cool { background: var(--qinghua-mist); color: var(--qinghua-deep); }
.badge.warm { background: var(--paper-deep); color: var(--ink-soft); }

/* Chip — outlined or filled */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-sm);
  padding: 6px 12px;
  border-radius: var(--radius-chip);
  border: var(--hairline);
  background: var(--paper-white);
  color: var(--ink-black);
  transition: all var(--dur-fast) var(--ease);
}
.chip:hover { border-color: var(--qinghua-blue); color: var(--qinghua-blue); }
.chip.active {
  border-color: var(--qinghua-blue);
  background: var(--qinghua-mist);
  color: var(--qinghua-deep);
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--radius-button);
  background: var(--qinghua-blue);
  color: var(--paper-white);
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: var(--text-base);
  transition: background-color var(--dur-fast) var(--ease);
}
.btn-primary:hover { background: var(--qinghua-deep); }
.btn-primary:disabled { background: var(--stone-gray); cursor: not-allowed; }

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 19px;
  border-radius: var(--radius-button);
  background: transparent;
  color: var(--qinghua-blue);
  border: 0.5px solid var(--qinghua-blue);
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: var(--text-base);
}
.btn-outline:hover { background: var(--qinghua-mist); }

.link-btn {
  background: none;
  border: none;
  color: var(--qinghua-blue);
  font-size: var(--text-sm);
  padding: 8px 0;
  text-decoration: underline;
  text-decoration-thickness: 0.5px;
  text-underline-offset: 3px;
}
.link-btn:hover { color: var(--qinghua-deep); }

/* FAB — fixed bottom-right */
.fab {
  position: fixed;
  bottom: var(--space-5);
  right: var(--space-5);
  width: var(--fab-size);
  height: var(--fab-size);
  display: grid;
  place-items: center;
  background: var(--paper-white);
  border: var(--hairline);
  border-radius: var(--radius-fab);
  box-shadow: var(--shadow-fab);
  z-index: 40;
  transition: transform var(--dur-fast) var(--ease);
}
.fab:hover { transform: translateY(-2px); }
.fab .chop { font-size: 1em; }

/* Drawer (Dashboard) */
.drawer-backdrop, .modal-backdrop, .sheet-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(44, 44, 44, 0.32);
  backdrop-filter: blur(2px);
  z-index: 50;
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease);
}
.drawer-backdrop.open, .modal-backdrop.open, .sheet-backdrop.open { opacity: 1; }
.drawer {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: min(85vw, 420px);
  background: var(--paper-white);
  border-right: var(--hairline);
  z-index: 60;
  transform: translateX(-100%);
  transition: transform var(--dur-base) var(--ease);
  overflow-y: auto;
  overscroll-behavior: contain;
}
.drawer.open { transform: translateX(0); }

/* Modal (Translate) */
.modal {
  position: fixed;
  inset: 0;
  background: var(--paper-white);
  z-index: 70;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.modal.open { opacity: 1; pointer-events: auto; }
@media (min-width: 720px) {
  .modal {
    inset: auto;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: min(600px, 92vw);
    max-height: 85vh;
    border: var(--hairline);
    border-radius: var(--radius-card);
  }
}

/* Sheet (Auth) */
.sheet {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--paper-white);
  z-index: 80;
  transform: translateY(100%);
  transition: transform var(--dur-base) var(--ease);
  box-shadow: var(--shadow-sheet);
  border-top: var(--hairline);
  max-height: 92vh;
  overflow-y: auto;
}
.sheet.open { transform: translateY(0); }
@media (min-width: 720px) {
  .sheet {
    left: 50%;
    right: auto;
    bottom: 50%;
    transform: translate(-50%, 50%) translateY(100%);
    width: min(440px, 92vw);
    border: var(--hairline);
    border-radius: var(--radius-card);
  }
  .sheet.open { transform: translate(-50%, 50%); }
}

/* Hairline divider */
.divider {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--stone-gray);
  font-size: var(--text-xs);
  margin: var(--space-4) 0;
}
.divider::before, .divider::after {
  content: '';
  flex: 1;
  height: 0.5px;
  background: var(--stone-mist);
}

/* Skeleton (loading shimmer) */
.skeleton {
  background: linear-gradient(90deg, var(--paper-warm) 0%, var(--paper-deep) 50%, var(--paper-warm) 100%);
  background-size: 200% 100%;
  animation: shimmer 1.4s var(--ease) infinite;
  border-radius: var(--radius-card);
}
@keyframes shimmer { from { background-position: 200% 0; } to { background-position: -200% 0; } }