/* ===== Tokens (color-system + aesthetic-usability: consistency over novelty) ===== */
:root {
  /* Neutral palette — the "boring by design" 90% of the UI */
  --gray-0: #ffffff;
  --gray-50: #f7f7f8;
  --gray-100: #eeeef0;
  --gray-200: #dfe0e3;
  --gray-400: #9a9ca3;
  --gray-600: #63666f;
  --gray-800: #33353d;
  --gray-900: #1c1d22;

  /* One accent — reserved for the single primary action per screen (von-restorff-effect) */
  --accent: #1f6f5c;
  --accent-hover: #185a4a;
  --accent-contrast: #ffffff;

  /* Status colors — small, secondary weight (pills), never used for chrome */
  --status-available-bg: #e7f5ef;
  --status-available-fg: #1f6f5c;
  --status-requested-bg: #fbf1df;
  --status-requested-fg: #93650f;
  --status-reserved-bg: #eef0fb;
  --status-reserved-fg: #3d3f9e;
  --status-checked_out-bg: #f1f1f3;
  --status-checked_out-fg: #63666f;

  --radius-card: 16px;
  --radius-control: 10px;
  --radius-pill: 999px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  background: var(--gray-50);
  color: var(--gray-900);
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font-family: inherit; font-size: inherit; }
h1, h2, h3, p { margin: 0; }
img { max-width: 100%; display: block; }

/* ===== Buttons — only ONE filled/accent style exists, used once per screen ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border-radius: var(--radius-control);
  padding: 10px 18px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  min-height: 44px; /* touch target */
}
.btn-primary {
  background: var(--accent);
  color: var(--accent-contrast);
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-ghost {
  background: transparent;
  border-color: var(--gray-200);
  color: var(--gray-800);
}
.btn-ghost:hover { background: var(--gray-100); }
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.btn[disabled] { opacity: 0.5; cursor: not-allowed; }

/* ===== Top bar / nav — deliberately plain chrome ===== */
.topbar {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  padding: var(--space-3) var(--space-5);
  background: var(--gray-0);
  border-bottom: 1px solid var(--gray-200);
  flex-wrap: wrap;
}
.brand { font-weight: 700; font-size: 1.1rem; }
.nav { display: flex; gap: var(--space-2); flex: 1; }
.nav-link {
  background: none;
  border: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-control);
  color: var(--gray-600);
  font-weight: 600;
  cursor: pointer;
}
.nav-link:hover { background: var(--gray-100); }
.nav-link.active { color: var(--gray-900); background: var(--gray-100); }
.switcher { display: flex; align-items: center; gap: var(--space-2); font-size: 0.9rem; color: var(--gray-600); }
.switcher select {
  padding: 6px 10px;
  border-radius: var(--radius-control);
  border: 1px solid var(--gray-200);
  background: var(--gray-0);
}

main#app { max-width: 1200px; margin: 0 auto; padding: var(--space-5) var(--space-4); }

/* ===== Filter bar ===== */
.filter-bar {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}
.filter-bar input[type="text"],
.filter-bar select {
  padding: 10px 14px;
  border-radius: var(--radius-control);
  border: 1px solid var(--gray-200);
  background: var(--gray-0);
}
.filter-bar input[type="text"] { flex: 1; min-width: 180px; }

/* ===== Marketplace grid (layout-grid skill) ===== */
.item-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-4);
}
.empty-state {
  padding: var(--space-6);
  text-align: center;
  color: var(--gray-600);
}

/* ===== Item card (component-spec: ItemCard) ===== */
.item-card {
  background: var(--gray-0);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-card);
  overflow: hidden;
  cursor: pointer;
  text-align: left;
  padding: 0;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}
.item-card:hover { box-shadow: 0 6px 20px rgba(0,0,0,0.08); transform: translateY(-2px); }
.item-card:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.item-photo {
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.5rem;
  background: var(--gray-100);
}
.item-photo img { width: 100%; height: 100%; object-fit: cover; }
.item-photo.dimmed { filter: grayscale(0.6) opacity(0.7); }

.item-body { padding: var(--space-3) var(--space-4) var(--space-4); display: flex; flex-direction: column; gap: var(--space-2); flex: 1; }
.item-title { font-weight: 700; font-size: 1rem; }

.tag-cloud { display: flex; flex-wrap: wrap; gap: var(--space-1); }
.tag-chip {
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: var(--gray-100);
  color: var(--gray-600);
}

.status-pill {
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
}
.status-pill.available { background: var(--status-available-bg); color: var(--status-available-fg); }
.status-pill.requested { background: var(--status-requested-bg); color: var(--status-requested-fg); }
.status-pill.reserved { background: var(--status-reserved-bg); color: var(--status-reserved-fg); }
.status-pill.checked_out { background: var(--status-checked_out-bg); color: var(--status-checked_out-fg); }

/* ===== Family badge — the one identity signature that repeats everywhere ===== */
.family-badge { display: inline-flex; align-items: center; gap: 6px; font-size: 0.82rem; color: var(--gray-800); }
.family-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 0 2px var(--gray-0);
}
.family-badge.dot-only .family-name { display: none; }
.family-badge.large .family-dot { width: 20px; height: 20px; }
.family-badge.large { font-size: 1rem; font-weight: 600; }

/* Two-family pairing on a borrowed card — "sharing" visual language */
.family-pair { display: flex; align-items: center; gap: 4px; }
.family-pair .link-glyph { color: var(--gray-400); font-size: 0.8rem; }

/* ===== Modal ===== */
.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(20, 20, 24, 0.45);
  display: flex; align-items: flex-start; justify-content: center;
  padding: var(--space-5) var(--space-4);
  overflow-y: auto;
  z-index: 50;
}
.modal {
  background: var(--gray-0);
  border-radius: var(--radius-card);
  max-width: 560px;
  width: 100%;
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.modal-header { display: flex; justify-content: space-between; align-items: flex-start; gap: var(--space-3); }
.modal-close { background: none; border: none; font-size: 1.4rem; line-height: 1; cursor: pointer; color: var(--gray-400); padding: 4px; }
.modal .item-photo { border-radius: var(--radius-control); }

.why-block {
  background: var(--gray-50);
  border-radius: var(--radius-control);
  padding: var(--space-3);
  font-size: 0.9rem;
  color: var(--gray-800);
  font-style: italic;
}

/* ===== Date strip (gesture-patterns: swipe + button fallback) ===== */
.date-strip-wrap { display: flex; align-items: center; gap: var(--space-2); }
.date-strip {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  padding: 4px 2px;
  flex: 1;
}
.date-cell {
  scroll-snap-align: start;
  flex: 0 0 auto;
  width: 46px;
  height: 58px;
  border-radius: var(--radius-control);
  border: 1px solid var(--gray-200);
  background: var(--gray-0);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  gap: 2px;
  font-size: 0.78rem;
  color: var(--gray-800);
}
.date-cell .dow { font-size: 0.65rem; color: var(--gray-400); text-transform: uppercase; }
.date-cell.reserved { background: var(--gray-100); color: var(--gray-400); cursor: not-allowed; }
.date-cell.reserved .family-dot { width: 8px; height: 8px; margin-top: 2px; }
.date-cell.selected { border-color: var(--accent); background: var(--status-available-bg); }
.date-cell.today { font-weight: 700; }
.strip-arrow {
  background: var(--gray-0);
  border: 1px solid var(--gray-200);
  border-radius: 50%;
  width: 32px; height: 32px;
  cursor: pointer;
  flex-shrink: 0;
}
.strip-legend { display: flex; gap: var(--space-4); font-size: 0.78rem; color: var(--gray-600); margin-top: var(--space-2); }
.legend-swatch { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 4px; }

/* ===== Forms (form-design) ===== */
.form { display: flex; flex-direction: column; gap: var(--space-4); }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-weight: 600; font-size: 0.88rem; }
.field .hint { font-weight: 400; color: var(--gray-400); font-size: 0.78rem; }
.field input[type="text"],
.field input[type="file"],
.field select,
.field textarea {
  padding: 10px 12px;
  border-radius: var(--radius-control);
  border: 1px solid var(--gray-200);
  background: var(--gray-0);
  width: 100%;
}
.field textarea { resize: vertical; min-height: 72px; }
.form-actions { display: flex; gap: var(--space-3); }
.section-card {
  background: var(--gray-0);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-card);
  padding: var(--space-5);
  max-width: 560px;
}

.confirm-banner {
  background: var(--status-available-bg);
  color: var(--status-available-fg);
  border-radius: var(--radius-control);
  padding: var(--space-4);
  font-weight: 600;
}

/* ===== Profile ===== */
.profile-header { display: flex; align-items: center; gap: var(--space-4); margin-bottom: var(--space-5); }
.profile-photo-placeholder {
  width: 56px; height: 56px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; color: var(--gray-0); font-weight: 700;
}
h2.section-title { font-size: 1rem; color: var(--gray-600); margin: var(--space-5) 0 var(--space-3); text-transform: uppercase; letter-spacing: 0.04em; }
.request-row {
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-3);
  background: var(--gray-0); border: 1px solid var(--gray-200); border-radius: var(--radius-control);
  padding: var(--space-3) var(--space-4); margin-bottom: var(--space-2);
  flex-wrap: wrap;
}
.owned-list { display: flex; flex-direction: column; gap: var(--space-2); }
.owned-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-2) 0; border-bottom: 1px solid var(--gray-100);
}

/* ===== Responsive (responsive-design skill) ===== */
@media (max-width: 640px) {
  .topbar { padding: var(--space-3) var(--space-4); gap: var(--space-3); }
  .nav { order: 3; width: 100%; justify-content: space-between; }
  main#app { padding: var(--space-4) var(--space-3); }
  .item-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: var(--space-3); }
  .modal { padding: var(--space-4); }
}