/* Reusable UI components */

/* --- Buttons --------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 22px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast),
    background-color var(--transition-fast);
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.97);
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
  box-shadow: var(--shadow-md);
}

.btn--accent {
  background: var(--color-burgundy);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.btn--accent:hover {
  box-shadow: var(--shadow-md);
  background: #7c2f41;
}

.btn--ghost-light {
  background: rgba(255, 250, 241, 0.14);
  color: var(--color-white);
  border-color: rgba(255, 250, 241, 0.5);
  backdrop-filter: blur(2px);
}

.btn--ghost-light:hover {
  background: rgba(255, 250, 241, 0.22);
}

.btn--ghost {
  background: transparent;
  color: var(--color-burgundy);
  border-color: var(--color-border);
}

.btn--ghost:hover {
  background: var(--color-white);
  border-color: var(--color-burgundy);
}

.btn--disabled,
.btn--disabled:hover {
  background: var(--color-border);
  color: var(--color-text-muted);
  cursor: not-allowed;
}

.btn--lg {
  padding: 15px 26px;
  font-size: 1.02rem;
}

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

/* --- Badges ------------------------------------------------------------ */
.badge {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--color-surface);
  color: var(--color-secondary);
  border: 1px solid var(--color-border);
}

.badge--muted {
  background: var(--color-border);
  color: var(--color-text-muted);
}

/* --- Site header --------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 var(--space-4);
  background: rgba(244, 239, 230, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-med), box-shadow var(--transition-med);
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.site-header__logo {
  width: 64px;
  height: 30px;
  object-fit: contain;
}

.site-header__name {
  display: block;
  width: 88px;
  height: 30px;
  object-fit: contain;
}

.site-header__nav {
  display: none;
  gap: var(--space-6);
  font-weight: 500;
  color: var(--color-secondary);
}

.site-header__nav a {
  position: relative;
  padding: 4px 0;
  transition: color var(--transition-fast);
}

.site-header__nav a:hover,
.site-header__nav a.is-active {
  color: var(--color-burgundy);
}

.site-header__nav a.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
}

@media (min-width: 768px) {
  .site-header__nav {
    display: flex;
  }
}

/* --- Bottom tab bar (mobile) ----------------------------------------- */
.tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 40;
  display: flex;
  justify-content: space-around;
  align-items: center;
  height: var(--tabbar-height);
  padding-bottom: env(safe-area-inset-bottom);
  background: rgba(244, 239, 230, 0.96);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--color-border);
}

.tab-bar__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.tab-bar__item i {
  font-size: 1.3rem;
}

.tab-bar__item:hover,
.tab-bar__item.is-active {
  color: var(--color-burgundy);
}

@media (min-width: 768px) {
  .tab-bar {
    display: none;
  }
}

/* --- Site footer ------------------------------------------------------ */
.site-footer {
  margin-top: var(--space-8);
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-7) var(--space-4) var(--space-5);
}

.site-footer__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 250, 241, 0.15);
  padding-bottom: var(--space-5);
}

.site-footer__name {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
}

.site-footer__tagline {
  color: rgba(255, 250, 241, 0.7);
  margin-top: var(--space-2);
  max-width: 320px;
}

.site-footer__details p {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: rgba(255, 250, 241, 0.85);
  margin-bottom: var(--space-2);
}

.site-footer__copyright {
  max-width: var(--content-max);
  margin: var(--space-4) auto 0;
  color: rgba(255, 250, 241, 0.55);
  font-size: 0.85rem;
}

/* --- Section shell ------------------------------------------------------ */
.section {
  padding: var(--space-7) 0;
}

.section--muted {
  background: var(--color-surface);
  margin: 0 calc(-1 * var(--space-4));
  padding: var(--space-7) var(--space-4);
  border-radius: var(--radius-lg);
}

.section__heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.section__link {
  font-weight: 600;
  color: var(--color-burgundy);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
  flex-shrink: 0;
}

.section__subtitle {
  color: var(--color-text-muted);
  font-size: 0.92rem;
  margin: 0;
}

/* Reveal-on-scroll utility */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 640ms var(--ease), transform 640ms var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Book card ------------------------------------------------------ */
.book-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-med), box-shadow var(--transition-med);
}

.book-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.book-card__cover {
  position: relative;
  aspect-ratio: 1 / 1;
  background: var(--color-surface);
  overflow: hidden;
}

.book-card__cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-med);
}

.book-card:hover .book-card__cover img {
  transform: scale(1.05);
}

.book-card__condition {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(45, 36, 28, 0.72);
  color: var(--color-white);
  font-size: 0.68rem;
  font-weight: 600;
  padding: 4px 9px;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.book-card__body {
  padding: var(--space-4);
}

.book-card__title {
  font-size: 1.08rem;
  margin-bottom: 2px;
  line-height: 1.25;
}

.book-card__author {
  color: var(--color-text-muted);
  font-size: 0.88rem;
  margin-bottom: 2px;
}

.book-card__rating {
  margin: 0 0 var(--space-2);
}

.book-card__stars {
  color: var(--color-accent);
  font-size: 0.82rem;
  letter-spacing: 1px;
}

.book-card__price {
  color: var(--color-burgundy);
  font-weight: 700;
  margin: 0;
  font-family: var(--font-body);
}

/* Horizontal scroller for featured/related books */
.book-scroller {
  display: flex;
  gap: var(--space-4);
  overflow-x: auto;
  padding-bottom: var(--space-2);
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.book-scroller::-webkit-scrollbar {
  height: 6px;
}

.book-scroller::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 999px;
}

.book-scroller .book-card {
  flex: 0 0 168px;
  scroll-snap-align: start;
}

@media (min-width: 600px) {
  .book-scroller .book-card {
    flex-basis: 200px;
  }
}

/* Grid layout for browse/recent listings */
.book-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

@media (min-width: 600px) {
  .book-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 900px) {
  .book-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* --- Genre chips ------------------------------------------------------ */
.genre-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.genre-chip {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  color: var(--color-secondary);
  padding: 10px 18px;
  border-radius: 999px;
  font-weight: 500;
  font-size: 0.92rem;
  transition: background var(--transition-fast), color var(--transition-fast),
    transform var(--transition-fast);
}

.genre-chip:hover {
  background: var(--color-forest);
  color: var(--color-white);
  transform: translateY(-2px);
}

/* --- Callout ------------------------------------------------------------ */
.callout {
  padding: var(--space-8) var(--space-4);
  margin: var(--space-7) calc(-1 * var(--space-4)) 0;
  background: var(--color-forest);
  color: var(--color-white);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  text-align: center;
}

.callout__inner {
  max-width: 480px;
  margin: 0 auto;
}

.callout__icon {
  font-size: 2rem;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
  display: inline-block;
}

.callout h2 {
  color: var(--color-white);
}

.callout p {
  color: rgba(255, 250, 241, 0.8);
}

.callout__hours {
  font-weight: 600;
  color: var(--color-accent);
}

.callout .btn {
  margin-top: var(--space-3);
}

/* --- Empty state ------------------------------------------------------ */
.empty-state {
  text-align: center;
  padding: var(--space-8) var(--space-4);
  color: var(--color-text-muted);
}

.empty-state i {
  font-size: 2.4rem;
  color: var(--color-accent);
  display: block;
  margin-bottom: var(--space-3);
}

/* --- Public feedback -------------------------------------------------- */
.flash-stack {
  padding-top: var(--space-4);
}

.flash {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-3);
  font-size: 0.92rem;
  font-weight: 500;
}

.flash--success {
  background: rgba(65, 83, 59, 0.12);
  color: var(--color-forest);
  border: 1px solid rgba(65, 83, 59, 0.2);
}

.flash--error {
  background: rgba(106, 39, 55, 0.1);
  color: var(--color-burgundy);
  border: 1px solid rgba(106, 39, 55, 0.18);
}