/* Kindle E-Ink Optimized Minimalist Stylesheet */

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background-color: #fafafa;
  color: #111;
  font-family: Georgia, serif;
  line-height: 1.6;
  font-size: 19px;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 650px;
  margin: 40px auto;
  padding: 20px;
}

/* Header */
.main-header {
  margin-bottom: 25px;
  border-bottom: 2px solid #111;
  padding-bottom: 15px;
}

.main-header h1 {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 28px;
  font-weight: bold;
  margin: 0 0 5px 0;
  color: #000;
}

.main-header .subtitle {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 14px;
  margin: 0;
  color: #444;
}

/* Navigation Tabs */
.navigation-hub {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.nav-tab {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 16px;
  color: #333;
  text-decoration: none;
  padding: 6px 12px;
  border: 1px solid #ccc;
  background-color: #fff;
}

.nav-tab:hover {
  border-color: #111;
  color: #000;
}

.nav-tab.active {
  background-color: #000;
  color: #fff;
  border-color: #000;
  font-weight: bold;
}

/* Filter / Subcategory bar */
.filter-bar {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 14px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 25px;
  padding: 10px;
  background-color: #eee;
  border: 1px solid #ccc;
}

.filter-link {
  color: #333;
  text-decoration: underline;
  cursor: pointer;
}

.filter-link.active {
  font-weight: bold;
  color: #000;
}

/* Utilities */
.hidden {
  display: none !important;
}

.loading {
  text-align: center;
  padding: 40px 0;
  font-family: system-ui, -apple-system, sans-serif;
  color: #555;
  font-style: italic;
}

/* Reading List Articles */
.article-summary-card {
  margin-bottom: 30px;
  border-bottom: 1px dashed #bbb;
  padding-bottom: 20px;
}

.article-summary-card h3 {
  margin: 0 0 8px 0;
  font-size: 21px;
  line-height: 1.3;
}

.article-summary-card h3 a {
  color: #0044bb;
  text-decoration: underline;
}

.article-summary-card p {
  margin: 0 0 12px 0;
  font-size: 16px;
  color: #222;
  text-align: justify;
  line-height: 1.5;
}

.article-summary-card .meta {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 13px;
  color: #555;
}

/* Pagination Controls */
.pagination-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 30px;
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 16px;
  border-top: 1px solid #ccc;
  padding-top: 20px;
}

.btn-page {
  background: #fff;
  border: 1px solid #111;
  padding: 8px 16px;
  font-size: 16px;
  cursor: pointer;
  color: #111;
  font-weight: bold;
}

.btn-page:hover {
  background: #000;
  color: #fff;
}

.btn-page[disabled] {
  border-color: #ccc;
  color: #ccc;
  cursor: not-allowed;
  background: #fafafa;
}

#page-indicator {
  font-weight: bold;
}

/* Reading Detail Mode */
.back-nav {
  margin-bottom: 25px;
}

.btn-back {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 15px;
  color: #0044bb;
  text-decoration: underline;
}

.article-header {
  margin-bottom: 30px;
  border-bottom: 1px solid #bbb;
  padding-bottom: 20px;
}

.article-meta {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 13px;
  color: #555;
  margin-bottom: 10px;
}

.article-header h1 {
  font-size: 30px;
  line-height: 1.25;
  margin: 0 0 10px 0;
  color: #000;
}

.article-subtitle {
  font-size: 18px;
  color: #444;
  font-style: italic;
  margin: 0 0 15px 0;
  line-height: 1.4;
}

.article-author {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 14px;
  color: #111;
}

.article-body {
  font-size: 19px;
  text-align: justify;
  line-height: 1.7;
}

.article-body h2 {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 23px;
  font-weight: bold;
  margin: 35px 0 15px 0;
  border-bottom: 1px solid #ddd;
  padding-bottom: 5px;
  color: #000;
}

.article-body h3 {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 20px;
  font-weight: bold;
  margin: 25px 0 12px 0;
  color: #000;
}

.article-body p {
  margin: 0 0 20px 0;
  text-indent: 1.5em;
}

.article-body ul, .article-body ol {
  margin: 0 0 20px 0;
  padding-left: 25px;
}

.article-body li {
  margin-bottom: 10px;
}

.article-body blockquote {
  margin: 30px 0;
  padding-left: 20px;
  border-left: 4px solid #888;
  font-style: italic;
  color: #444;
}

.detail-footer {
  margin-top: 50px;
  border-top: 1px solid #111;
  padding-top: 20px;
}

/* Global Footer */
.main-footer {
  margin-top: 60px;
  border-top: 1px solid #ccc;
  padding-top: 20px;
  text-align: center;
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 13px;
  color: #666;
}