/*
Theme Name: Letter Library
Theme URI: https://letterlibrary.com
Author: Letter Library
Author URI: https://letterlibrary.com
Description: A clean, serif-forward theme for Letter Library — a searchable repository of historical letters, memos, and telegrams.
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: letterlibrary
Tags: custom-menu, featured-images, threaded-comments, translation-ready
*/

/* =========================================================
   CSS CUSTOM PROPERTIES
   ========================================================= */
:root {
  --color-bg:          #faf9f6;
  --color-surface:     #ffffff;
  --color-border:      #e8e4dc;
  --color-border-dark: #c8c2b4;
  --color-text:        #1a1814;
  --color-text-muted:  #6b6560;
  --color-text-light:  #9b948c;
  --color-accent:      #8b4513;
  --color-accent-dark: #6b3410;
  --color-accent-light:#f5ede6;
  --color-link:        #5c3a1e;
  --color-link-hover:  #8b4513;
  --color-tag-bg:      #f0ebe3;
  --color-tag-text:    #5c4a3a;
  --color-highlight:   #fff3cd;

  --font-serif:        'Lora', 'Georgia', 'Times New Roman', serif;
  --font-sans:         'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:         'JetBrains Mono', 'Courier New', monospace;

  --text-xs:    0.75rem;
  --text-sm:    0.875rem;
  --text-base:  1rem;
  --text-md:    1.125rem;
  --text-lg:    1.25rem;
  --text-xl:    1.5rem;
  --text-2xl:   1.875rem;
  --text-3xl:   2.25rem;
  --text-4xl:   3rem;

  --leading-tight:  1.25;
  --leading-snug:   1.375;
  --leading-normal: 1.6;
  --leading-relaxed:1.75;
  --leading-loose:  2;

  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;
  --radius-xl:  16px;
  --radius-full:9999px;

  --shadow-sm:  0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg:  0 10px 30px rgba(0,0,0,0.10), 0 4px 8px rgba(0,0,0,0.04);

  --max-width-content: 720px;
  --max-width-wide:    1100px;
  --max-width-full:    1400px;

  --transition-fast:   150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow:   400ms ease;
}

/* =========================================================
   RESET & BASE
   ========================================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, video {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-link-hover);
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* =========================================================
   TYPOGRAPHY
   ========================================================= */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: var(--leading-tight);
  color: var(--color-text);
  letter-spacing: -0.01em;
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-md); }

p {
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
}

p:last-child {
  margin-bottom: 0;
}

/* =========================================================
   LAYOUT
   ========================================================= */
.container {
  width: 100%;
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container--narrow {
  max-width: var(--max-width-content);
}

.container--wide {
  max-width: var(--max-width-full);
}

/* =========================================================
   SITE HEADER
   ========================================================= */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: var(--space-8);
}

.site-branding {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.site-title {
  font-family: 'Dancing Script', cursive;
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0;
  line-height: 1;
}

.site-title a {
  color: inherit;
}

.site-title a:hover {
  color: var(--color-accent);
}

.site-tagline {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-weight: 400;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-left: 1px solid var(--color-border);
  padding-left: var(--space-3);
  display: none;
}

@media (min-width: 640px) {
  .site-tagline { display: block; }
}

.site-logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.site-logo {
  height: 36px;
  width: auto;
  display: block;
}

@media (max-width: 480px) {
  .site-logo {
    height: 28px;
  }
}

/* =========================================================
   NAVIGATION
   ========================================================= */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.main-nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.main-nav a:hover,
.main-nav a.current-menu-item {
  color: var(--color-text);
  background: var(--color-tag-bg);
}

.header-search {
  flex: 1;
  max-width: 360px;
}

.header-search-form {
  position: relative;
}

.header-search-input {
  width: 100%;
  padding: var(--space-2) var(--space-4);
  padding-right: var(--space-10);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-bg);
  font-size: var(--text-sm);
  color: var(--color-text);
  transition: all var(--transition-fast);
  outline: none;
}

.header-search-input:focus {
  border-color: var(--color-accent);
  background: var(--color-surface);
  box-shadow: 0 0 0 3px rgba(139, 69, 19, 0.08);
}

.header-search-input::placeholder {
  color: var(--color-text-light);
}

.header-search-btn {
  position: absolute;
  right: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  padding: 0;
  transition: color var(--transition-fast);
}

.header-search-btn:hover {
  color: var(--color-accent);
}

/* =========================================================
   HERO / HOMEPAGE
   ========================================================= */
.site-hero {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-20) 0 var(--space-16);
  text-align: center;
}

.site-hero__eyebrow {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.site-hero__title {
  font-size: clamp(2rem, 5vw, var(--text-4xl));
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-5);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.site-hero__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto var(--space-10);
  line-height: var(--leading-relaxed);
  font-family: var(--font-sans);
}

/* =========================================================
   SEARCH BAR (HERO)
   ========================================================= */
.search-hero {
  max-width: 640px;
  margin: 0 auto;
}

.search-hero__form {
  /* wrapper — no border here, border is on __row */
}

.search-hero__input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: var(--text-md);
  font-family: var(--font-serif);
  color: var(--color-text);
  padding: var(--space-2) var(--space-3);
  outline: none;
}

.search-hero__input::placeholder {
  color: var(--color-text-light);
  font-style: italic;
}

.search-hero__btn {
  background: var(--color-accent);
  color: white;
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: var(--font-sans);
  letter-spacing: 0.02em;
  transition: background var(--transition-fast);
  white-space: nowrap;
}

.search-hero__btn:hover {
  background: var(--color-accent-dark);
}

.search-hero__options {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  margin-top: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.search-hero__options label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
}

.search-hero__options input[type="checkbox"] {
  accent-color: var(--color-accent);
}

/* =========================================================
   STATS BAR
   ========================================================= */
.stats-bar {
  background: var(--color-accent-light);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-3) 0;
}

.stats-bar__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}

.stat-item__number {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
}

.stat-item__label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: var(--space-1);
}

/* =========================================================
   LETTER CARDS / GRID
   ========================================================= */
.letters-section {
  padding: var(--space-16) 0;
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-top: 10px;
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.section-title {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 600;
}

.section-link {
  font-size: var(--text-sm);
  color: var(--color-accent);
  font-weight: 500;
}

.section-link:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

.letters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-6);
}

.letter-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  position: relative;
}

.letter-card:hover {
  border-color: var(--color-border-dark);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.letter-card__type {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.letter-card__title {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: var(--leading-snug);
  color: var(--color-text);
}

.letter-card__title a {
  color: inherit;
}

.letter-card__title a:hover {
  color: var(--color-accent);
}

.letter-card__meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.letter-card__meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.letter-card__meta-item svg {
  flex-shrink: 0;
  color: var(--color-text-light);
}

.letter-card__meta-item strong {
  color: var(--color-text);
  font-weight: 500;
}

.letter-card__excerpt {
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  font-style: italic;
}

.letter-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
}

.letter-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-2);
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.tag:hover {
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.letter-card__versions {
  font-size: var(--text-xs);
  color: var(--color-text-light);
  white-space: nowrap;
}

/* =========================================================
   SEARCH RESULTS PAGE
   ========================================================= */
.search-page {
  padding: var(--space-12) 0;
}

.search-page__header {
  margin-bottom: var(--space-8);
}

.search-page__title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-2);
}

.search-page__count {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.search-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-8);
  align-items: start;
}

@media (max-width: 900px) {
  .search-layout {
    grid-template-columns: 1fr;
  }
}

/* =========================================================
   FILTER SIDEBAR
   ========================================================= */
.filter-sidebar {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  position: sticky;
  top: 80px;
}

.filter-sidebar__title {
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
}

.filter-group {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.filter-group:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.filter-group__label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  display: block;
}

.filter-group__input {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-text);
  background: var(--color-bg);
  outline: none;
  transition: border-color var(--transition-fast);
}

.filter-group__input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px rgba(139, 69, 19, 0.08);
}

.filter-date-range {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
}

.filter-checkboxes {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-height: 200px;
  overflow-y: auto;
}

.filter-checkbox {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text);
  cursor: pointer;
}

.filter-checkbox input[type="checkbox"] {
  accent-color: var(--color-accent);
  width: 14px;
  height: 14px;
}

.filter-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: var(--font-sans);
  transition: all var(--transition-fast);
  cursor: pointer;
  text-decoration: none;
  border: 1.5px solid transparent;
}

.btn--primary {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: white;
}

.btn--secondary {
  background: transparent;
  color: var(--color-text-muted);
  border-color: var(--color-border);
}

.btn--secondary:hover {
  background: var(--color-tag-bg);
  color: var(--color-text);
  border-color: var(--color-border-dark);
}

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

/* =========================================================
   LETTER SINGLE PAGE
   ========================================================= */
.letter-single {
  padding: var(--space-12) 0 var(--space-20);
}

/* Single centered column — no sidebar */
.letter-single__column {
  max-width: 720px;
  margin: 0 auto;
}

/* Keep old layout class in case it's referenced elsewhere */
.letter-single__layout {
  max-width: 720px;
  margin: 0 auto;
}

.letter-single__main {}

.letter-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}

.letter-breadcrumb a {
  color: var(--color-text-muted);
}

.letter-breadcrumb a:hover {
  color: var(--color-accent);
}

.letter-breadcrumb__sep {
  color: var(--color-text-light);
}

.letter-header {
  margin-bottom: var(--space-8);
}

.letter-type-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}

.letter-title {
  font-size: clamp(1.5rem, 3vw, var(--text-3xl));
  font-weight: 700;
  line-height: var(--leading-snug);
  margin-bottom: var(--space-5);
  letter-spacing: -0.02em;
}

.letter-metadata-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-4);
  background: var(--color-accent-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin-bottom: var(--space-8);
}

.letter-meta-item {}

.letter-meta-item__label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

.letter-meta-item__value {
  font-size: var(--text-sm);
  color: var(--color-text);
  font-weight: 500;
}

.letter-meta-item__value a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.letter-meta-item__value a:hover {
  color: var(--color-accent);
}

/* =========================================================
   VERSIONS TABS
   ========================================================= */
.letter-versions {
  margin-bottom: var(--space-6);
}

.letter-versions__label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.versions-tabs {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.version-tab {
  padding: var(--space-2) var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-surface);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.version-tab:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.version-tab.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

/* =========================================================
   LETTER BODY TEXT
   ========================================================= */
.letter-body {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-10) var(--space-12);
  margin-bottom: var(--space-8);
  position: relative;
}

@media (max-width: 640px) {
  .letter-body {
    padding: var(--space-6);
  }
}

.letter-body::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.letter-body__text {
  font-family: var(--font-serif);
  font-size: var(--text-md);
  line-height: var(--leading-loose);
  color: var(--color-text);
  white-space: pre-wrap;
}

.letter-body__text p {
  margin-bottom: var(--space-5);
  text-indent: 2em;
}

.letter-body__text p:first-child {
  text-indent: 0;
}

.letter-body__text .salutation {
  font-style: italic;
  margin-bottom: var(--space-5);
  text-indent: 0;
}

.letter-body__text .closing {
  margin-top: var(--space-6);
  text-indent: 0;
}

.letter-body__text .signature {
  margin-top: var(--space-3);
  text-indent: 0;
  font-style: italic;
}

/* Footnote markers in letter text */
.letter-body__text sup.footnote-ref {
  font-size: 0.65em;
  color: var(--color-accent);
  font-family: var(--font-sans);
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}

/* =========================================================
   FOOTNOTES
   ========================================================= */
.letter-footnotes {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.letter-footnotes__title {
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.footnote-item {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  color: var(--color-text-muted);
}

.footnote-item__number {
  font-weight: 700;
  color: var(--color-accent);
  flex-shrink: 0;
  font-family: var(--font-sans);
  font-size: var(--text-xs);
}

/* =========================================================
   LETTER SIDEBAR (SINGLE)
   ========================================================= */
.letter-sidebar {}

.sidebar-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin-bottom: var(--space-5);
}

.sidebar-card__title {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.sidebar-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.sidebar-sources {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.source-item {
  font-size: var(--text-sm);
  line-height: var(--leading-snug);
}

.source-item__name {
  font-weight: 600;
  color: var(--color-text);
  display: block;
  margin-bottom: var(--space-1);
}

.source-item__link {
  color: var(--color-accent);
  font-size: var(--text-xs);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.letter-image {
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.letter-image img {
  width: 100%;
  height: auto;
}

.letter-image__caption {
  padding: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-align: center;
  background: var(--color-bg);
  font-style: italic;
}

/* =========================================================
   LETTER BOTTOM SECTIONS (sources, topics, related, image)
   ========================================================= */

/* Topics / Tags section */
.letter-topics {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.letter-topics__label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.letter-topics__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* Sources section (bottom) */
.letter-sources {
  margin-top: var(--space-8);
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.letter-sources__title {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.letter-sources__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.letter-source-item {
  font-size: var(--text-sm);
  line-height: var(--leading-snug);
}

.letter-source-item__name {
  font-weight: 600;
  color: var(--color-text);
  display: block;
  margin-bottom: var(--space-1);
}

.letter-source-item__link {
  color: var(--color-accent);
  font-size: var(--text-xs);
  text-decoration: underline;
  text-underline-offset: 2px;
  display: inline-block;
  margin-bottom: var(--space-1);
}

.letter-source-item__citation {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-style: italic;
  margin-top: var(--space-1);
}

/* Related letters section */
.letter-related {
  margin-top: var(--space-8);
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.letter-related__title {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.letter-related__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.letter-related__item a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-link);
  line-height: var(--leading-snug);
}

.letter-related__item a:hover {
  color: var(--color-accent);
}

.letter-related__all {
  display: inline-block;
  margin-top: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-accent);
  font-weight: 600;
}

/* Image inline (above letter body) */
.letter-image-inline {
  margin-bottom: var(--space-6);
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.letter-image-inline__label {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.letter-image-inline__caption {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-style: italic;
  margin-top: var(--space-2);
  text-align: center;
}

.letter-image-inline__link {
  color: var(--color-accent);
  font-size: var(--text-sm);
  font-weight: 500;
}

/* FRUS letter formatting */
.letter-body__text .ll-doc-number {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
  display: block;
}

.letter-body__text .ll-dateline {
  text-align: right;
  font-style: italic;
  margin-bottom: var(--space-5);
  display: block;
}

.letter-body__text .ll-dateline-location {
  font-variant: small-caps;
  font-style: normal;
}

.letter-body__text .ll-smallcaps {
  font-variant: small-caps;
}

.letter-body__text .ll-signed {
  text-align: right;
  font-variant: small-caps;
  font-weight: 600;
  margin-top: var(--space-4);
  display: block;
}

.letter-body__text .ll-postscript {
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.letter-body__text .ll-opener {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-5);
  gap: var(--space-4);
  flex-wrap: wrap;
}

.letter-body__text .ll-opener-left {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.letter-body__text .ll-opener-right {
  font-style: italic;
  text-align: right;
}

/* Full-fidelity TEI rendering classes */
.letter-body__text .ll-dateline-right {
  text-align: right;
  font-style: italic;
  margin-bottom: var(--space-4);
  display: block;
  line-height: var(--leading-relaxed);
}

.letter-body__text .ll-dateline-left {
  text-align: left;
  font-style: italic;
  margin-bottom: var(--space-4);
  display: block;
}

.letter-body__text .ll-dateline-center {
  text-align: center;
  font-style: italic;
  margin-bottom: var(--space-4);
  display: block;
}

.letter-body__text .ll-salute {
  margin-bottom: var(--space-4);
  display: block;
}

.letter-body__text .ll-closer {
  margin-top: var(--space-6);
}

.letter-body__text .ll-section-head {
  text-align: center;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin: var(--space-8) 0 var(--space-4);
}

.letter-body__text .ll-doc-number {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
  display: block;
}

.letter-body__text .ll-right {
  display: block;
  text-align: right;
}

.letter-body__text .ll-left {
  display: block;
  text-align: left;
}

.letter-body__text .ll-center {
  display: block;
  text-align: center;
}

.letter-body__text .ll-list {
  margin: var(--space-4) 0 var(--space-4) var(--space-6);
  list-style: disc;
}

.letter-body__text .ll-list li {
  margin-bottom: var(--space-2);
}

.letter-body__text .ll-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-4) 0;
  font-size: var(--text-sm);
}

.letter-body__text .ll-table td {
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  vertical-align: top;
}

/* =========================================================
   CATEGORY / ARCHIVE PAGES
   ========================================================= */
.archive-page {
  padding: var(--space-12) 0 var(--space-20);
}

.archive-header {
  text-align: center;
  padding: var(--space-16) 0 var(--space-12);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-12);
}

.archive-header__eyebrow {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.archive-header__title {
  font-size: clamp(1.75rem, 4vw, var(--text-4xl));
  font-weight: 700;
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.archive-header__description {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto;
  line-height: var(--leading-relaxed);
}

.archive-header__count {
  display: inline-block;
  margin-top: var(--space-4);
  padding: var(--space-1) var(--space-3);
  background: var(--color-tag-bg);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* =========================================================
   HERO COUNT STATS
   ========================================================= */
.hero-count-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-10);
  flex-wrap: wrap;
  margin-top: var(--space-8);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}

.hero-count {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.hero-count__number {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  letter-spacing: -0.02em;
}

.hero-count__label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* =========================================================
   SEARCH HERO — NEW LAYOUT
   Input on its own line; Search button + Advanced link below
   ========================================================= */

/* Input wrapper: full-width styled box */
.search-hero__input-wrap {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2) var(--space-4);
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-hero__input-wrap:focus-within {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(139, 69, 19, 0.08), var(--shadow-md);
}

.search-hero__input-wrap .search-hero__input {
  width: 100%;
  font-size: var(--text-md);
  padding: var(--space-2) 0;
  border: none;
  background: transparent;
}

/* Actions row: button + advanced link, below the input */
.search-hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  margin-top: var(--space-3);
}

.search-hero__actions .search-hero__btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  border-radius: var(--radius-md);
}

.search-hero__advanced {
  color: var(--color-accent);
  font-weight: 500;
  font-size: var(--text-sm);
}

.search-hero__advanced:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

/* =========================================================
   CATEGORIES SECTION
   ========================================================= */
.categories-section {
  padding: var(--space-16) 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

.category-group {
  margin-bottom: var(--space-16);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-border);
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.tag__count {
  margin-left: 10px !important;
  opacity: 0.6;
  font-size: 0.8em;
}

.category-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
  margin-top: var(--space-4);
}

@media (max-width: 768px) {
  .category-columns {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .category-columns {
    grid-template-columns: repeat(2, 1fr);
  }
}

.category-col {
  /* individual column */
}

.category-list {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.category-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
}

.category-list li:last-child {
  border-bottom: none;
}

.category-list li a {
  color: var(--color-text);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.category-list li a:hover {
  color: var(--color-accent);
}

.category-list .see-all {
  color: var(--color-accent);
  font-style: italic;
  font-weight: 400;
}

.category-list__count {
  font-size: var(--text-xs);
  color: var(--color-text-light);
  background: var(--color-tag-bg);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

/* =========================================================
   BROWSE / EXPLORE SECTIONS
   ========================================================= */
.browse-section {
  padding: var(--space-16) 0;
  border-top: 1px solid var(--color-border);
}

.browse-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-3);
}

.browse-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.browse-card:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.browse-card__name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

.browse-card:hover .browse-card__name {
  color: var(--color-accent);
}

.browse-card__count {
  font-size: var(--text-xs);
  color: var(--color-text-light);
  background: var(--color-tag-bg);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

/* =========================================================
   PAGINATION
   ========================================================= */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-12);
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.pagination a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-light);
}

.pagination .current {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

/* =========================================================
   SEARCH HIGHLIGHT
   ========================================================= */
mark.search-highlight {
  background: var(--color-highlight);
  color: var(--color-text);
  border-radius: 2px;
  padding: 0 2px;
}

/* =========================================================
   SITE FOOTER
   ========================================================= */
.site-footer {
  background: var(--color-text);
  color: rgba(255,255,255,0.7);
  padding: var(--space-16) 0 var(--space-8);
  margin-top: var(--space-20);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

@media (max-width: 768px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
}

@media (max-width: 480px) {
  .site-footer__grid {
    grid-template-columns: 1fr;
  }
}

.footer-brand__title {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 700;
  color: white;
  margin-bottom: var(--space-3);
}

.footer-brand__desc {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  max-width: 280px;
}

.footer-col__title {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-bottom: var(--space-4);
}

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

.footer-col__links a {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.7);
  transition: color var(--transition-fast);
}

.footer-col__links a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.4);
}

/* =========================================================
   ADMIN / INGESTION NOTICE
   ========================================================= */
.admin-bar-notice {
  display: none;
}

body.logged-in .admin-bar-notice {
  display: block;
}

/* =========================================================
   LOADING / SKELETON
   ========================================================= */
.skeleton {
  background: linear-gradient(90deg, var(--color-border) 25%, var(--color-bg) 50%, var(--color-border) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* =========================================================
   UTILITIES
   ========================================================= */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.font-serif { font-family: var(--font-serif); }
.font-sans { font-family: var(--font-sans); }

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 768px) {
  .main-nav { display: none; }
  .letters-grid { grid-template-columns: 1fr; }
  .letter-single__layout { grid-template-columns: 1fr; }
  .letter-body { padding: var(--space-6) var(--space-5); }
}

@media (max-width: 480px) {
  .container { padding: 0 var(--space-4); }
  .site-hero { padding: var(--space-12) 0 var(--space-10); }

  /* Mobile: make search button full-width */
  .search-hero__actions {
    flex-direction: column;
    align-items: stretch;
  }
  .search-hero__actions .search-hero__btn {
    width: 100%;
    justify-content: center;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
  }
  .search-hero__advanced {
    text-align: center;
  }

  /* Mobile: reduce category-group bottom padding */
  .category-group {
    margin-bottom: var(--space-10);
    padding-bottom: var(--space-6);
  }
}

/* =========================================================
   BROWSE PAGES (Authors / Recipients / Years)
   ========================================================= */

/* Alphabet / decade jump nav */
.alpha-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-bottom: var(--space-10);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.alpha-nav__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.25rem;
  height: 2.25rem;
  padding: 0 var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: var(--font-sans);
  color: var(--color-text-muted);
  background: var(--color-surface);
  transition: all var(--transition-fast);
}

.alpha-nav__link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-light);
}

/* Term group (one per letter / decade) */
.term-group {
  margin-bottom: var(--space-12);
  scroll-margin-top: 80px; /* account for sticky header */
}

.term-group__letter {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-accent);
  border-bottom: 2px solid var(--color-accent-light);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-5);
}

/* Term list */
.term-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-1);
}

.term-list--years {
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
}

.term-list__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.term-list__item:hover {
  background: var(--color-accent-light);
}

.term-list__link {
  font-size: var(--text-base);
  color: var(--color-link);
  font-weight: 500;
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.term-list__link:hover {
  color: var(--color-accent);
}

.term-list__count {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: var(--space-20) 0;
  color: var(--color-text-muted);
}