/*
 * Reusable components: the app shell (header, nav, tab bar), buttons,
 * cards, chips, badges, the condition meter, toasts, dialogs, skeletons,
 * empty states. Anything used on more than one screen belongs here.
 */

/* --------------------------------------------------------------------
   App shell
   -------------------------------------------------------------------- */

.app-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--hairline);
}

.app-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding: var(--space-3) var(--page-gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--ink-strong);
  text-decoration: none;
  flex-shrink: 0;
}

.brand:hover { color: var(--ink-strong); }

.brand__mark {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
  filter: drop-shadow(0 1px 2px rgba(41, 30, 18, 0.18));
  transition: transform var(--dur-base) var(--ease-spring);
}

.brand:hover .brand__mark { transform: rotate(-6deg) scale(1.06); }

.brand__name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: 1;
}

.brand__name small {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-weight: 400;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--ink-subtle);
  margin-top: 2px;
}

.app-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.app-nav__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.42rem 0.8rem;
  border-radius: var(--radius-pill);
  color: var(--ink-muted);
  font-size: var(--text-base);
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
}

.app-nav__link:hover {
  background: var(--ember-soft);
  color: var(--ink);
}

.app-nav__link[aria-current="page"] {
  background: var(--surface-raised);
  color: var(--ink-strong);
  box-shadow: var(--shadow-xs), inset 0 0 0 1px var(--hairline);
}

.app-nav__link .icon { opacity: 0.75; }
.app-nav__link[aria-current="page"] .icon { opacity: 1; color: var(--ember); }

.app-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

/* The mobile tab bar replaces the header nav below the breakpoint. */
.tab-bar {
  display: none;
  position: fixed;
  inset: auto 0 0 0;
  z-index: 60;
  padding: var(--space-2) var(--space-2) calc(var(--space-2) + env(safe-area-inset-bottom));
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(16px);
  -webkit-backdrop-filter: saturate(1.4) blur(16px);
  border-top: 1px solid var(--hairline);
}

.tab-bar__inner {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  gap: var(--space-1);
}

.tab-bar__link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: var(--space-2) var(--space-1);
  border-radius: var(--radius-md);
  color: var(--ink-subtle);
  font-size: var(--text-2xs);
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.tab-bar__link[aria-current="page"] {
  color: var(--ember);
  background: var(--ember-soft);
}

@media (max-width: 47.9375rem) {
  .app-header__inner > .app-nav { display: none; }
  .tab-bar { display: block; }
  body { padding-bottom: 4.5rem; }
}

/* --------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------- */

/* Deliberately a bare `.btn`: qualifying it as `button.btn` would raise
   the specificity above the `.btn--primary` / `.btn--ghost` modifiers and
   silently neutralise them on every <button> and submit input. */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.56rem 1.1rem;
  min-height: 2.5rem;
  background: var(--surface-raised);
  color: var(--ink);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  letter-spacing: 0.005em;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  box-shadow: var(--shadow-xs);
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out),
              background-color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
}

.btn:hover {
  color: var(--ink-strong);
  border-color: color-mix(in srgb, var(--ink) 34%, transparent);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.btn:active { transform: translateY(0) scale(0.985); }

.btn[disabled],
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn--primary {
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--ember) 92%, white) 0%,
    var(--ember) 100%);
  border-color: color-mix(in srgb, var(--ember) 72%, black);
  color: var(--ember-ink);
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.btn--primary:hover {
  color: var(--ember-ink);
  border-color: color-mix(in srgb, var(--ember) 60%, black);
  box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.btn--ghost {
  background: transparent;
  border-color: transparent;
  box-shadow: none;
  color: var(--ink-muted);
}

.btn--ghost:hover {
  background: var(--ember-soft);
  border-color: transparent;
  box-shadow: none;
}

.btn--danger {
  background: transparent;
  border-color: color-mix(in srgb, var(--danger) 42%, transparent);
  color: var(--danger);
  box-shadow: none;
}

.btn--danger:hover {
  background: var(--danger-soft);
  border-color: var(--danger);
  color: var(--danger);
}

.btn--lg {
  padding: 0.8rem 1.5rem;
  min-height: 3rem;
  font-size: var(--text-md);
}

.btn--sm {
  padding: 0.34rem 0.75rem;
  min-height: 2rem;
  font-size: var(--text-sm);
}

.btn--block { width: 100%; }

.btn--icon {
  padding: 0;
  width: 2.5rem;
  height: 2.5rem;
  min-height: 0;
  border-radius: 50%;
}

/* button_to renders a wrapping <form>; keep it from forcing a line break
   wherever a button sits in a row of links. */
.btn-form {
  display: inline-block;
  margin: 0;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

/* --------------------------------------------------------------------
   Icons
   -------------------------------------------------------------------- */

.icon {
  display: inline-block;
  width: 1.15em;
  height: 1.15em;
  flex-shrink: 0;
  vertical-align: -0.2em;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon--lg { width: 1.6em; height: 1.6em; }
.icon--xl { width: 2.4em; height: 2.4em; stroke-width: 1.3; }

/* --------------------------------------------------------------------
   Surfaces
   -------------------------------------------------------------------- */

.card {
  position: relative;
  padding: var(--space-5);
  background: var(--surface-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.card--flush { padding: 0; overflow: hidden; }
.card--quiet { background: color-mix(in srgb, var(--surface-raised) 60%, transparent); box-shadow: none; }

.card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
}

.panel {
  padding: var(--space-4);
  background: var(--surface-sunken);
  border-radius: var(--radius-md);
  border: 1px solid var(--hairline);
}

/* A section heading with a rule that fills the remaining width — the
   house divider, used above every list on every screen. */
.section-head {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.section-head::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--hairline-strong), transparent);
}

.section-head h2,
.section-head h3 { flex-shrink: 0; }

/* --------------------------------------------------------------------
   Page header
   -------------------------------------------------------------------- */

.page-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.page-head__title { max-width: 40rem; }

.eyebrow {
  display: block;
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--ember);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  color: var(--ink-muted);
  font-size: var(--text-base);
  font-weight: 500;
  text-decoration: none;
}

.back-link:hover { color: var(--ember); }
.back-link .icon { transition: transform var(--dur-base) var(--ease-spring); }
.back-link:hover .icon { transform: translateX(-3px); }

/* --------------------------------------------------------------------
   Chips (filters, tags, shelves)
   -------------------------------------------------------------------- */

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.3rem 0.75rem;
  background: var(--surface-raised);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-pill);
  color: var(--ink-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}

.chip:hover {
  color: var(--ink-strong);
  border-color: var(--ember);
  transform: translateY(-1px);
}

.chip[aria-pressed="true"],
.chip.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--surface);
}

.chip__count {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  opacity: 0.65;
}

.chip--tag { color: var(--sage); border-color: color-mix(in srgb, var(--sage) 38%, transparent); }
.chip--tag:hover { border-color: var(--sage); color: var(--sage); }
.chip--tag[aria-pressed="true"],
.chip--tag.is-active { background: var(--sage); border-color: var(--sage); color: var(--surface-raised); }

.chip--shelf { color: var(--brass); border-color: color-mix(in srgb, var(--brass) 38%, transparent); }
.chip--shelf:hover { border-color: var(--brass); color: var(--brass); }
.chip--shelf[aria-pressed="true"],
.chip--shelf.is-active { background: var(--brass); border-color: var(--brass); color: var(--surface-raised); }

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* --------------------------------------------------------------------
   Condition grade: badge + pip meter
   -------------------------------------------------------------------- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  padding: 0.22em 0.7em;
  background: color-mix(in srgb, var(--grade, var(--ink-muted)) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--grade, var(--ink-muted)) 45%, transparent);
  border-radius: var(--radius-pill);
  color: var(--grade, var(--ink-muted));
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  white-space: nowrap;
}

.badge::before {
  content: "";
  width: 0.45em;
  height: 0.45em;
  border-radius: 50%;
  background: currentColor;
}

.badge--plain { --grade: var(--ink-muted); }
.badge--plain::before { display: none; }
.badge--flag {
  --grade: var(--notice);
  background: var(--notice-soft);
}

.grade-1 { --grade: var(--grade-1); }
.grade-2 { --grade: var(--grade-2); }
.grade-3 { --grade: var(--grade-3); }
.grade-4 { --grade: var(--grade-4); }
.grade-5 { --grade: var(--grade-5); }
.grade-6 { --grade: var(--grade-6); }

/* Six pips, filled left-to-right: "As New" fills all six, "Poor" one. A
   grade is a point on a known scale, and a bare word doesn't show that. */
.meter {
  display: flex;
  align-items: center;
  gap: 3px;
}

.meter__pip {
  width: 1.25rem;
  height: 5px;
  border-radius: var(--radius-pill);
  background: var(--hairline-strong);
}

.meter__pip.is-on { background: var(--grade, var(--ink-muted)); }

.grade-block {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* --------------------------------------------------------------------
   Definition list (book metadata, capture details)
   -------------------------------------------------------------------- */

.facts {
  display: grid;
  grid-template-columns: minmax(6rem, auto) 1fr;
  gap: var(--space-3) var(--space-4);
  align-items: baseline;
}

.facts dt {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--ink-subtle);
}

.facts dd {
  margin: 0;
  color: var(--ink);
}

/* --------------------------------------------------------------------
   Stats
   -------------------------------------------------------------------- */

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5) var(--space-6);
}

/* column-reverse so the value reads above its label while the markup
   stays a valid <dl>, where <dt> has to come first. */
.stat {
  display: flex;
  flex-direction: column-reverse;
  gap: var(--space-1);
}

.stat__value {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: 1;
  letter-spacing: var(--tracking-tight);
  color: var(--ink-strong);
  font-variant-numeric: tabular-nums;
}

.stat__label {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--ink-subtle);
}

/* --------------------------------------------------------------------
   Toasts (flash messages)
   -------------------------------------------------------------------- */

.toasts {
  position: fixed;
  z-index: 120;
  bottom: var(--space-5);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  width: min(30rem, calc(100vw - 2 * var(--space-4)));
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--surface-overlay);
  border: 1px solid var(--hairline-strong);
  border-left: 3px solid var(--toast-accent, var(--ink));
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  color: var(--ink);
  font-size: var(--text-base);
  pointer-events: auto;
  animation: toast-in var(--dur-slow) var(--ease-spring) both;
}

.toast--notice { --toast-accent: var(--success); }
.toast--alert { --toast-accent: var(--danger); }
.toast__icon { color: var(--toast-accent); margin-top: 0.15em; }
.toast__body { flex: 1; }

.toast__close {
  background: none;
  border: none;
  padding: var(--space-1);
  margin: calc(-1 * var(--space-1));
  color: var(--ink-subtle);
  cursor: pointer;
  border-radius: var(--radius-xs);
}

.toast__close:hover { color: var(--ink); }

.toast.is-leaving {
  animation: toast-out var(--dur-base) var(--ease-in-out) both;
}

@keyframes toast-in {
  from { opacity: 0; transform: translateY(1.25rem) scale(0.96); }
  to { opacity: 1; transform: none; }
}

@keyframes toast-out {
  to { opacity: 0; transform: translateY(0.5rem) scale(0.98); }
}

@media (max-width: 47.9375rem) {
  .toasts { bottom: calc(4.5rem + var(--space-3)); }
}

/* --------------------------------------------------------------------
   Confirm dialog (replaces window.confirm for Turbo)
   -------------------------------------------------------------------- */

.confirm-dialog {
  /* The reset zeroes every margin, which also removes the `margin: auto`
     a modal <dialog> relies on to centre itself. */
  margin: auto;
  width: min(24rem, calc(100vw - 2rem));
  padding: var(--space-5);
  background: var(--surface-overlay);
  color: var(--ink);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
}

.confirm-dialog::backdrop {
  background: var(--scrim);
  backdrop-filter: blur(3px);
}

.confirm-dialog[open] { animation: dialog-in var(--dur-base) var(--ease-spring) both; }

.confirm-dialog__actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

@keyframes dialog-in {
  from { opacity: 0; transform: translateY(0.75rem) scale(0.97); }
  to { opacity: 1; transform: none; }
}

/* --------------------------------------------------------------------
   Empty states
   -------------------------------------------------------------------- */

.empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-8) var(--space-5);
  text-align: center;
  background:
    repeating-linear-gradient(-45deg,
      transparent 0 12px,
      color-mix(in srgb, var(--ink) 3%, transparent) 12px 13px);
  border: 1px dashed var(--hairline-strong);
  border-radius: var(--radius-lg);
}

.empty__icon {
  color: var(--ink-subtle);
  opacity: 0.55;
}

.empty h3 { font-size: var(--text-lg); }
.empty p { max-width: 28rem; color: var(--ink-muted); }

/* --------------------------------------------------------------------
   Skeletons / pending states
   -------------------------------------------------------------------- */

.pending {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--surface-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  color: var(--ink-muted);
}

.spinner {
  width: 1.15rem;
  height: 1.15rem;
  flex-shrink: 0;
  border: 2px solid color-mix(in srgb, var(--ember) 28%, transparent);
  border-top-color: var(--ember);
  border-radius: 50%;
  animation: spin 720ms linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.skeleton {
  position: relative;
  overflow: hidden;
  background: var(--surface-sunken);
  border-radius: var(--radius-sm);
}

.skeleton::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--ink) 7%, transparent), transparent);
  animation: shimmer 1.4s var(--ease-in-out) infinite;
}

@keyframes shimmer {
  from { transform: translateX(-100%); }
  to { transform: translateX(100%); }
}

/* --------------------------------------------------------------------
   Record lists (invites, passkeys)
   -------------------------------------------------------------------- */

.record-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.record {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--surface-raised);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  transition: border-color var(--dur-fast) var(--ease-out);
}

.record:hover { border-color: var(--hairline-strong); }

.record__body {
  flex: 1;
  min-width: 0;
}

.record__title {
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.record__sub {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-subtle);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.record--spent { opacity: 0.6; }
.record--spent .record__title { text-decoration: line-through; }

/* --------------------------------------------------------------------
   Theme toggle
   -------------------------------------------------------------------- */

.theme-toggle .icon--sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon--sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon--moon { display: none; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon--sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon--moon { display: none; }
}

/* --------------------------------------------------------------------
   Demo-mode ribbon
   -------------------------------------------------------------------- */

.demo-flag {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.18em 0.6em;
  background: var(--sage-soft);
  border: 1px solid color-mix(in srgb, var(--sage) 45%, transparent);
  border-radius: var(--radius-pill);
  color: var(--sage);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

/* --------------------------------------------------------------------
   Reveal-on-scroll: hidden only once the controller has claimed it, so
   content is never stuck invisible when JS fails to load.
   -------------------------------------------------------------------- */

[data-reveal-ready] > * { will-change: transform, opacity; }