:root {
  --canvas: #f8f5ef;
  --surface: #fffdfa;
  --line: #ded8cc;
  --text: #292720;
  --muted: #6c655b;
  --forest: #315e4b;
  --forest-dark: #224536;
  --sage: #dbe6dc;
  --shadow: 0 10px 28px rgba(52, 43, 30, 0.07);
}

* { box-sizing: border-box; }

html { min-height: 100%; }

body {
  min-height: 100vh;
  margin: 0;
  background: var(--canvas);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans Thai", "Noto Sans", sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

a { color: var(--forest-dark); }

a:focus-visible, button:focus-visible {
  outline: 3px solid #8bb29e;
  outline-offset: 3px;
}

.shell { width: min(1120px, calc(100% - 2rem)); margin: 0 auto; }

.site-header { border-bottom: 1px solid var(--line); background: rgba(255, 253, 250, 0.92); }

.site-nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }

.brand { display: inline-flex; align-items: center; gap: .65rem; color: var(--text); font-weight: 750; text-decoration: none; letter-spacing: -.02em; }

.brand-mark { display: grid; place-items: center; width: 34px; height: 38px; background: var(--forest); color: #fff; border-radius: 7px 7px 4px 4px; font-size: .72rem; letter-spacing: .04em; }

.site-nav nav { display: flex; align-items: center; justify-content: flex-end; gap: .25rem; flex-wrap: wrap; }

.site-nav nav > a, .link-button { min-height: 44px; display: inline-flex; align-items: center; padding: .45rem .75rem; border-radius: 8px; color: var(--text); font: inherit; font-size: .94rem; font-weight: 650; text-decoration: none; }

.site-nav nav > a:hover, .link-button:hover { background: #f0ece4; }

.site-nav .nav-cta { background: var(--forest); color: #fff; }
.site-nav .nav-cta:hover { background: var(--forest-dark); }
.sign-out-form { margin: 0; }
.link-button { border: 0; background: transparent; cursor: pointer; }

.page-content { padding: clamp(2rem, 6vw, 5.5rem) 0; }

.welcome-card, .message-card { max-width: 780px; padding: clamp(2rem, 6vw, 4.75rem); background: var(--surface); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); }

.eyebrow, .card-kicker { margin: 0 0 .85rem; color: var(--forest); font-size: .78rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }

h1, h2, p { margin-top: 0; }
h1 { max-width: 18ch; margin-bottom: 1rem; font-size: clamp(2.05rem, 5vw, 3.5rem); line-height: 1.18; letter-spacing: -.045em; }
h2 { margin-bottom: .55rem; font-size: 1.25rem; line-height: 1.3; letter-spacing: -.02em; }

.welcome-copy { max-width: 45ch; margin-bottom: 1.75rem; color: var(--muted); font-size: 1.07rem; }

.search-form { display: flex; gap: .6rem; max-width: 620px; }
.search-form input, .catalog-filters input, .catalog-filters select { width: 100%; min-height: 48px; border: 1px solid #bfb8aa; border-radius: 8px; background: #fff; color: var(--text); font: inherit; padding: .65rem .8rem; }
.search-form input:focus, .catalog-filters input:focus, .catalog-filters select:focus { outline: 3px solid #b6d2c0; outline-offset: 1px; border-color: var(--forest); }
.search-form button, .catalog-filters button { min-height: 48px; border: 0; border-radius: 8px; background: var(--forest); color: #fff; cursor: pointer; font: inherit; font-weight: 750; padding: .65rem 1.1rem; white-space: nowrap; }
.search-form button:hover, .catalog-filters button:hover { background: var(--forest-dark); }

.catalog-section { margin-top: clamp(2.5rem, 6vw, 4.5rem); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 1rem; margin-bottom: 1.2rem; }
.section-heading .eyebrow, .section-heading .result-count { margin-bottom: .25rem; }
.section-heading h2 { margin: 0; font-size: clamp(1.55rem, 3vw, 2rem); }
.text-link, .back-link { font-weight: 750; text-underline-offset: .18em; }
.book-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1.2rem; }
.book-card { min-width: 0; }
.book-cover { position: relative; display: grid; place-items: center; aspect-ratio: .69; overflow: hidden; border: 1px solid #d6cec0; border-radius: 10px 12px 11px 9px; background: #bbc5aa; box-shadow: 4px 5px 0 #d8d0c3, 0 9px 20px rgba(45, 38, 25, .1); color: #273a2d; text-decoration: none; }
.book-card:nth-child(5n + 2) .book-cover { background: #c8af8e; color: #4f3826; }
.book-card:nth-child(5n + 3) .book-cover { background: #9fbbc3; color: #273f46; }
.book-card:nth-child(5n + 4) .book-cover { background: #c4a7a4; color: #4a302e; }
.book-card:nth-child(5n + 5) .book-cover { background: #d3c983; color: #4a461e; }
.book-cover img { width: 100%; height: 100%; object-fit: cover; }
.cover-initial { font-family: Georgia, serif; font-size: clamp(3rem, 7vw, 5.25rem); line-height: 1; font-weight: 700; opacity: .86; }
.cover-spine { position: absolute; inset: 0 auto 0 .55rem; width: 1px; background: rgba(255,255,255,.38); }
.book-card-content { padding-top: .95rem; }
.book-card-topline { display: flex; align-items: center; justify-content: space-between; gap: .5rem; min-height: 1.4rem; margin-bottom: .4rem; }
.book-category { overflow: hidden; color: var(--muted); font-size: .78rem; font-weight: 650; text-overflow: ellipsis; white-space: nowrap; }
.availability { display: inline-flex; align-items: center; width: fit-content; border-radius: 99px; font-size: .73rem; font-weight: 750; line-height: 1.2; padding: .35rem .55rem; white-space: nowrap; }
.availability-available { background: #dcebdd; color: #235238; }
.availability-reserved { background: #f5e5bb; color: #6a4b00; }
.availability-borrowed { background: #dce6ec; color: #304c5c; }
.book-card h2 { margin-bottom: .25rem; font-size: 1.08rem; }
.book-card h2 a { color: var(--text); text-decoration: none; }
.book-card h2 a:hover { color: var(--forest); text-decoration: underline; text-underline-offset: .18em; }
.book-author { margin-bottom: .5rem; color: var(--muted); font-size: .9rem; }
.book-excerpt { display: -webkit-box; overflow: hidden; margin-bottom: 0; color: var(--muted); font-size: .86rem; line-height: 1.55; -webkit-box-orient: vertical; -webkit-line-clamp: 3; }

.page-intro { max-width: 680px; }
.page-intro h1 { margin-bottom: .75rem; }
.page-intro > p:last-child { color: var(--muted); }
.catalog-filters { display: grid; grid-template-columns: minmax(260px, 2fr) minmax(160px, 1fr) minmax(160px, 1fr) auto; align-items: end; gap: .8rem; margin-top: 2rem; padding: 1rem; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; }
.catalog-filters label { display: block; margin-bottom: .35rem; color: var(--muted); font-size: .85rem; font-weight: 700; }
.result-count { color: var(--muted); font-size: .94rem; }
.pagination { display: flex; align-items: center; justify-content: center; gap: 1rem; margin-top: 2.5rem; color: var(--muted); font-size: .92rem; }
.pagination a { display: inline-flex; align-items: center; min-height: 44px; font-weight: 750; }
.empty-state { padding: 2.5rem 1.5rem; border: 1px dashed #beb6a8; border-radius: 12px; text-align: center; }
.empty-state h2 { font-size: 1.25rem; }
.empty-state p { color: var(--muted); }
.button-secondary { background: transparent; border: 1px solid var(--forest); color: var(--forest-dark); }
.button-secondary:hover { background: var(--sage); }

.back-link { display: inline-flex; min-height: 44px; align-items: center; margin-bottom: 1.25rem; }
.book-detail { display: grid; grid-template-columns: minmax(210px, 300px) minmax(0, 1fr); align-items: start; gap: clamp(1.5rem, 5vw, 4rem); padding: clamp(1.5rem, 4vw, 3rem); background: var(--surface); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); }
.detail-cover { width: 100%; }
.detail-content h1 { max-width: none; margin-bottom: .6rem; }
.book-subtitle { margin-bottom: .5rem; color: var(--muted); font-size: 1.1rem; }
.detail-author { margin-bottom: 1.25rem; font-size: 1.05rem; font-weight: 650; }
.reservation-prompt { display: grid; gap: .2rem; margin-top: 1.5rem; padding: 1rem; border-left: 3px solid var(--forest); background: #f0f5ef; color: var(--forest-dark); }
.reservation-prompt span { font-size: .92rem; }
.book-information { display: grid; grid-template-columns: minmax(0, 2fr) minmax(210px, 1fr); gap: clamp(1.5rem, 5vw, 4rem); margin-top: 2.5rem; }
.book-information h2 { font-size: 1.5rem; }
.summary { color: var(--text); font-size: 1.08rem; }
.muted { color: var(--muted); }
.book-facts { margin: 0; padding: 1.3rem; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; }
.book-facts div + div { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--line); }
.book-facts dt { color: var(--muted); font-size: .82rem; font-weight: 750; }
.book-facts dd { margin: .15rem 0 0; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.status-message { margin-bottom: 1.25rem; padding: .9rem 1rem; border: 1px solid #a8c6b0; border-radius: 10px; background: #edf6ed; color: #235238; font-weight: 650; }
.member-intro { margin-bottom: 2.5rem; }
.member-section + .member-section { margin-top: 2.8rem; }
.member-section > h2 { margin-bottom: 1rem; font-size: 1.45rem; }
.member-list { display: grid; gap: .8rem; }
.member-book-row { display: flex; align-items: center; justify-content: space-between; gap: 1.25rem; padding: 1.1rem 1.25rem; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; }
.member-book-info h2, .member-book-info h3 { margin-bottom: .2rem; font-size: 1.1rem; }
.member-book-info h2 a, .member-book-info h3 a { color: var(--text); text-decoration: none; }
.member-book-info h2 a:hover, .member-book-info h3 a:hover { color: var(--forest); text-decoration: underline; text-underline-offset: .18em; }
.member-book-info p { margin-bottom: .15rem; color: var(--muted); }
.member-date { font-size: .9rem; }
.member-book-row form { margin: 0; flex: 0 0 auto; }
.empty-state.compact { padding: 1.25rem; text-align: left; }
.empty-state.compact p { margin-bottom: .3rem; }
.admin-heading { display: flex; align-items: end; justify-content: space-between; gap: 1rem; }
.admin-heading h1 { margin-bottom: 0; }
.admin-heading form { margin: 0; }
.admin-heading-actions { display: flex; align-items: center; gap: .7rem; flex-wrap: wrap; }
.admin-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: .8rem; margin-top: 2rem; }
.admin-stats article { display: grid; gap: .25rem; padding: 1rem; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.admin-stats span, .admin-list span, .admin-table span { color: var(--muted); font-size: .87rem; }
.admin-stats strong { font-size: 1.75rem; line-height: 1.2; }
.admin-section { margin-top: 2.8rem; }
.admin-list, .admin-table { display: grid; gap: .65rem; }
.admin-list article, .admin-table article { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1rem 1.15rem; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.admin-list article > div:first-child, .admin-table article > div:first-child { display: grid; min-width: 0; }
.admin-actions { display: flex; align-items: center; gap: .8rem; flex: 0 0 auto; }
.admin-actions form { margin: 0; }
.text-button { border: 0; background: transparent; color: #8b3933; cursor: pointer; font: inherit; font-weight: 750; padding: 0; text-decoration: underline; text-underline-offset: .18em; }
.admin-form, .admin-form-section, .confirmation-card { max-width: 760px; margin-top: 1.75rem; padding: clamp(1.25rem, 4vw, 2rem); border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
.admin-form { display: grid; gap: 1rem; }
.admin-form label { display: block; margin-bottom: .35rem; color: var(--muted); font-size: .88rem; font-weight: 750; }
.admin-form input, .admin-form select, .admin-form textarea { width: 100%; min-height: 44px; border: 1px solid #bfb8aa; border-radius: 8px; background: #fff; color: var(--text); font: inherit; padding: .6rem .75rem; }
.admin-form textarea { min-height: auto; resize: vertical; }
.admin-form input:focus, .admin-form select:focus, .admin-form textarea:focus { outline: 3px solid #b6d2c0; outline-offset: 1px; border-color: var(--forest); }
.admin-form span.field-validation-error, .admin-form .validation-summary-errors { color: #963a32; font-size: .88rem; }
.admin-form .check-label { display: flex; align-items: center; gap: .5rem; color: var(--text); font-size: 1rem; }
.admin-form .check-label input { width: 18px; min-height: 18px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.integration-form { max-width: 820px; }
.integration-section { display: grid; gap: 1rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--line); }
.integration-section + .integration-section { padding-top: .5rem; }
.integration-section h2 { margin-bottom: .2rem; font-size: 1.2rem; }
.integration-section p { margin: 0; color: var(--muted); font-size: .92rem; }
.confirmation-card h1 { margin-bottom: 1.5rem; }
.confirmation-card h2 { margin-bottom: .3rem; }
.confirmation-card form { display: flex; gap: .75rem; flex-wrap: wrap; margin-top: 1.25rem; }
.photo-upload-form { display: grid; gap: 1rem; max-width: 760px; margin-top: 1.75rem; }
.photo-step { display: grid; grid-template-columns: 2.5rem minmax(0, 1fr); gap: 1rem; padding: 1.25rem; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
.photo-step h2 { margin-bottom: .2rem; }
.photo-step p:not(.step-number) { color: var(--muted); font-size: .92rem; }
.step-number { display: grid; place-items: center; width: 2rem; height: 2rem; margin: .1rem 0 0; border-radius: 99px; background: var(--forest); color: #fff; font-weight: 800; }
.photo-picker { display: grid; place-items: center; min-height: 56px; margin-top: .8rem; border: 1px dashed #8da093; border-radius: 9px; background: #f3f7f1; color: var(--forest-dark); cursor: pointer; font-weight: 750; text-align: center; }
.photo-picker input { position: absolute; width: 1px; height: 1px; overflow: hidden; opacity: 0; }
.local-preview { display: block; width: min(100%, 300px); max-height: 380px; margin-top: 1rem; border-radius: 8px; object-fit: contain; }
.draft-photos { display: grid; grid-template-columns: repeat(2, minmax(0, 260px)); gap: 1rem; margin-top: 1.5rem; }
.draft-photos figure { margin: 0; }
.draft-photos img { width: 100%; aspect-ratio: .7; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); object-fit: cover; }
.draft-photos figcaption { margin-top: .35rem; color: var(--muted); font-size: .88rem; font-weight: 700; }
.analysis-message { max-width: 760px; margin-top: 1rem; padding: .85rem 1rem; border-left: 3px solid var(--forest); background: #eff6ef; color: var(--forest-dark); }
.analysis-error { border-color: #bd6a43; background: #f9eee6; color: #7b3d24; }
.analysis-form { display: flex; align-items: center; gap: .8rem; flex-wrap: wrap; margin-top: 1rem; }
.analysis-form button:disabled { cursor: progress; opacity: .72; }
.analysis-progress { color: var(--muted); font-size: .92rem; }
.import-review-form { margin-top: 1rem; }

.button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: .7rem 1rem; border-radius: 8px; background: var(--forest); color: #fff; font-weight: 700; text-decoration: none; }
.button:hover { background: var(--forest-dark); }

.site-footer { padding: 1.5rem 0 2rem; color: var(--muted); font-size: .88rem; }
.identity-nav { display: flex; align-items: center; gap: .8rem; margin: 0; padding: 0; list-style: none; }
.identity-nav form { margin: 0; }
.identity-nav button { border: 0; background: transparent; color: var(--forest-dark); cursor: pointer; font: inherit; padding: 0; text-decoration: underline; text-underline-offset: .18em; }

@media (max-width: 640px) {
  .shell { width: min(100% - 1.25rem, 1120px); }
  .site-nav { min-height: 64px; }
  .brand { font-size: .94rem; }
  .site-nav nav { gap: 0; }
  .site-nav nav > a, .link-button { padding-inline: .5rem; font-size: .88rem; }
  .welcome-card, .message-card { border-radius: 13px; }
  .search-form { display: grid; grid-template-columns: 1fr; }
  .book-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem .85rem; }
  .book-card-topline { align-items: flex-start; flex-direction: column; }
  .catalog-filters { grid-template-columns: 1fr; }
  .catalog-filters button { width: 100%; }
  .section-heading { align-items: start; flex-direction: column; }
  .book-detail, .book-information { grid-template-columns: 1fr; }
  .detail-cover { width: min(250px, 75%); }
  .member-book-row { align-items: stretch; flex-direction: column; }
  .member-book-row .button { width: 100%; }
  .admin-heading { align-items: start; flex-direction: column; }
  .admin-heading-actions { width: 100%; }
  .admin-stats { grid-template-columns: repeat(2, 1fr); }
  .admin-list article, .admin-table article { align-items: start; flex-direction: column; }
  .form-grid { grid-template-columns: 1fr; }
  .draft-photos { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}