:root {
  /* Palette Emas & Putih/Krem - Serasi Halaman Utama INTISATU */
  --color-gold: #D4AF37;
  --color-dark-gold: #B8941F;
  --color-green: #2D5016;
  --color-light-green: #4A7C59;
  --color-medium-brown: #5D4E37;
  --color-light-brown: #8B7355;
  --color-cream: #F5F5DC;
  --color-white: #FFFFFF;

  /* Variabel Tema Terang (Light Mode) */
  --bg-primary: #F9F7F3;
  --bg-secondary: #FFFFFF;
  --bg-card: rgba(255, 255, 255, 0.95);
  --text-primary: #2E2B28;
  --text-secondary: #5A5145;
  --text-muted: #8F8478;
  --border-color: rgba(212, 175, 55, 0.25);
  --border-gold-focus: rgba(212, 175, 55, 0.85);
  --card-border-hover: rgba(212, 175, 55, 0.6);
  --shadow-soft: 0 10px 30px rgba(93, 78, 55, 0.06);
  --shadow-hover: 0 18px 42px rgba(212, 175, 55, 0.18);
  --tag-bg: rgba(212, 175, 55, 0.12);
  --tag-color: #5D4E37;
  --quote-bg: rgba(212, 175, 55, 0.08);

  --font-primary: 'Playfair Display', Georgia, serif;
  --font-secondary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --transition-smooth: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Variabel Tema Gelap (Dark Mode) */
[data-theme="dark"] {
  --bg-primary: #151412;
  --bg-secondary: #1F1D1A;
  --bg-card: rgba(31, 29, 26, 0.92);
  --text-primary: #F2EFE9;
  --text-secondary: #C8BFB5;
  --text-muted: #8E8478;
  --border-color: rgba(212, 175, 55, 0.22);
  --border-gold-focus: rgba(212, 175, 55, 0.9);
  --card-border-hover: rgba(212, 175, 55, 0.65);
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 20px 45px rgba(212, 175, 55, 0.22);
  --tag-bg: rgba(212, 175, 55, 0.16);
  --tag-color: #E5D5A0;
  --quote-bg: rgba(212, 175, 55, 0.1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-secondary);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.85;
  transition: background-color 0.4s ease, color 0.4s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
}

/* Reading Progress Bar di paling atas */
.reading-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3.5px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-dark-gold));
  z-index: 1001;
  transition: width 0.1s ease-out;
}

/* Ambient background aura */
.bg-aura {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 600px;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(circle at 50% 0%, rgba(212, 175, 55, 0.12) 0%, transparent 65%),
    radial-gradient(circle at 10% 20%, rgba(45, 80, 22, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 90% 20%, rgba(184, 148, 31, 0.06) 0%, transparent 50%);
}

.container {
  max-width: 840px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
  width: 100%;
}

/* Top Sticky Navigation Bar */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(249, 247, 243, 0.88);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition-smooth);
}

[data-theme="dark"] .top-nav {
  background: rgba(21, 20, 18, 0.9);
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 68px;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

/* Tombol Kembali ke Katalog (Pengganti Sidebar Awal) */
.btn-back-catalog {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text-primary);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 0.45rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  box-shadow: var(--shadow-soft);
  transition: var(--transition-smooth);
}

.btn-back-catalog:hover {
  color: var(--color-gold);
  border-color: var(--color-gold);
  transform: translateX(-3px);
  box-shadow: 0 4px 14px rgba(212, 175, 55, 0.25);
}

.nav-brand-link {
  font-family: var(--font-primary);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-secondary);
  letter-spacing: 1.5px;
  text-decoration: none;
  transition: var(--transition-smooth);
}

.nav-brand-link:hover {
  color: var(--color-gold);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.nav-current-id {
  font-family: 'Courier New', monospace;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-gold);
  background: var(--tag-bg);
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  border: 1px solid var(--border-color);
}

.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-primary);
  transition: var(--transition-smooth);
  box-shadow: var(--shadow-soft);
}

.theme-toggle:hover {
  transform: scale(1.08);
  border-color: var(--color-gold);
}

.theme-toggle .sun-icon { display: block; }
.theme-toggle .moon-icon { display: none; }

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

/* Article Reading Wrapper */
.article-wrapper {
  padding: 3.5rem 0 5rem;
  flex: 1;
}

/* Article Header */
.article-header {
  margin-bottom: 3rem;
  text-align: center;
  position: relative;
}

.article-id-badge {
  display: inline-block;
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-gold);
  letter-spacing: 1.5px;
  background: var(--tag-bg);
  padding: 0.3rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  margin-bottom: 1.25rem;
}

.article-title {
  font-family: var(--font-primary);
  font-size: clamp(2.1rem, 5vw, 3.2rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 1.1rem;
  letter-spacing: 0.5px;
}

.article-subtitle {
  font-family: var(--font-primary);
  font-size: clamp(1.15rem, 2.5vw, 1.45rem);
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 1.5rem;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

.article-meta-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.6rem 1.25rem;
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.article-meta-row span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.article-tags-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.45rem;
  list-style: none;
  margin-bottom: 2rem;
}

.article-tags-list li {
  background: var(--tag-bg);
  color: var(--tag-color);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.2rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border-color);
}

.header-gold-divider {
  width: 120px;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
  margin: 0 auto;
}

/* Article Main Body (Content Panel) */
.article-card-panel {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 3.5rem 3rem;
  box-shadow: var(--shadow-soft);
  position: relative;
  margin-bottom: 3.5rem;
}

/* Base Article Typography System (Modular & Ergonomic) */
.article-content {
  font-family: var(--font-secondary);
  font-size: 1.125rem; /* 18px */
  color: var(--text-primary);
  line-height: 1.82;
  letter-spacing: -0.011em;
  word-break: break-word;
}

.article-content p {
  margin-bottom: 1.25rem;
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4 {
  font-family: var(--font-primary);
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.35;
}

.article-content h2 {
  font-size: 1.75rem;
  margin: 2.25rem 0 0.85rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  letter-spacing: -0.015em;
}

.article-content h3 {
  font-size: 1.35rem;
  margin: 1.65rem 0 0.65rem;
}

.article-content h4 {
  font-size: 1.15rem;
  margin: 1.35rem 0 0.5rem;
}

.article-content blockquote {
  background: var(--quote-bg);
  border-left: 4px solid var(--color-gold);
  padding: 1.25rem 1.65rem;
  border-radius: 0 14px 14px 0;
  margin: 1.85rem 0;
  font-family: var(--font-primary);
  font-style: italic;
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--text-primary);
}

.article-content blockquote p {
  margin-bottom: 0.6rem;
}

.article-content blockquote p:last-child {
  margin-bottom: 0;
}

.article-content ul,
.article-content ol {
  margin: 1.25rem 0 1.6rem 1.75rem;
  line-height: 1.75;
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-content li > p {
  margin-bottom: 0.5rem;
}

.article-content strong,
.article-content b {
  font-weight: 600;
  color: var(--text-primary);
}

.article-content em,
.article-content i {
  font-style: italic;
}

.article-content code {
  font-family: 'Courier New', monospace;
  font-size: 0.88em;
  background: rgba(212, 175, 55, 0.12);
  color: var(--color-dark-gold);
  padding: 0.2rem 0.45rem;
  border-radius: 6px;
  border: 1px solid rgba(212, 175, 55, 0.2);
}

[data-theme="dark"] .article-content code {
  color: var(--color-gold);
  background: rgba(212, 175, 55, 0.16);
}

.article-content pre {
  background: #1e1e1e;
  color: #d4d4d4;
  padding: 1.25rem 1.5rem;
  border-radius: 12px;
  overflow-x: auto;
  margin: 2rem 0;
  font-size: 0.92rem;
  line-height: 1.6;
}

.article-content pre code {
  background: transparent;
  border: none;
  color: inherit;
  padding: 0;
}

.article-content hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-color), transparent);
  margin: 1.85rem auto;
  max-width: 60%;
}

.article-content hr + h1,
.article-content hr + h2,
.article-content hr + h3,
.article-content hr + h4 {
  margin-top: 0.75rem;
}

.article-content a {
  color: var(--color-gold);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: var(--transition-smooth);
}

.article-content a:hover {
  color: var(--color-dark-gold);
}

/* Table styling generated from Markdown */
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.95rem;
  display: block;
  overflow-x: auto;
}

.article-content th,
.article-content td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  text-align: left;
}

.article-content th {
  background: var(--tag-bg);
  font-weight: 600;
  color: var(--text-primary);
}

.article-content tr:nth-child(even) td {
  background: rgba(212, 175, 55, 0.03);
}

/* Article Completion Signature Box */
.completion-box {
  margin-top: 3.5rem;
  padding: 2.25rem;
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.08), rgba(45, 80, 22, 0.04));
  border: 1px solid var(--border-color);
  border-radius: 18px;
  text-align: center;
}

.completion-icon {
  display: inline-block;
  color: var(--color-gold);
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.completion-text {
  font-family: var(--font-primary);
  font-style: italic;
  font-size: 1.15rem;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
}

.completion-meta {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* Central Hub Action: Kembali ke Seluruh Simpul */
.catalog-hub-action {
  text-align: center;
  margin: 2.5rem 0;
}

.btn-catalog-hub {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.95rem 2rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--color-gold), var(--color-dark-gold));
  color: #FFFFFF;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  box-shadow: 0 6px 20px rgba(212, 175, 55, 0.35);
  transition: var(--transition-smooth);
}

.btn-catalog-hub:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 28px rgba(212, 175, 55, 0.45);
}

/* Prev / Next Navigation */
.article-nav-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 3.5rem;
}

.nav-card {
  display: flex;
  flex-direction: column;
  padding: 1.5rem 1.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  text-decoration: none;
  transition: var(--transition-smooth);
  box-shadow: var(--shadow-soft);
}

.nav-card:hover {
  border-color: var(--card-border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.nav-card.next-card {
  text-align: right;
}

.nav-card-label {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-gold);
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.nav-card-title {
  font-family: var(--font-primary);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.35;
  transition: var(--transition-smooth);
}

.nav-card:hover .nav-card-title {
  color: var(--color-gold);
}

/* Related Articles Section */
.related-section {
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border-color);
}

.related-title-head {
  font-family: var(--font-primary);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: 2rem;
  position: relative;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.related-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.5rem;
  text-decoration: none;
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-soft);
}

.related-card:hover {
  transform: translateY(-5px);
  border-color: var(--card-border-hover);
  box-shadow: var(--shadow-hover);
}

.related-card-id {
  font-family: 'Courier New', monospace;
  font-size: 0.82rem;
  color: var(--color-gold);
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.related-card-title {
  font-family: var(--font-primary);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
  line-height: 1.35;
  transition: var(--transition-smooth);
}

.related-card:hover .related-card-title {
  color: var(--color-gold);
}

.related-card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-top: auto;
}

/* Footer */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 3rem 0;
  text-align: center;
  margin-top: auto;
}

.footer-brand {
  font-family: var(--font-primary);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 1.5px;
  margin-bottom: 0.5rem;
}

.footer-quote {
  font-style: italic;
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition-smooth);
}

.footer-links a:hover {
  color: var(--color-gold);
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Floating Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 99999;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1.5px solid var(--border-color);
  color: var(--color-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(93, 78, 55, 0.15);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(14px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px) scale(1.1);
  border-color: var(--color-gold);
  box-shadow: 0 10px 28px rgba(212, 175, 55, 0.35);
  color: var(--color-dark-gold);
}

.back-to-top svg {
  pointer-events: none;
  transition: transform 0.2s ease;
}

.back-to-top:hover svg {
  transform: translateY(-2px);
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
  .article-wrapper {
    padding: 2.25rem 0 4rem;
  }
  .article-card-panel {
    padding: 1.75rem 1.15rem;
    border-radius: 16px;
    margin-bottom: 2.5rem;
  }
  .article-content {
    font-size: 1.0625rem; /* 17px */
    line-height: 1.75;
    letter-spacing: -0.01em;
  }
  .article-content p {
    margin-bottom: 1.05rem;
  }
  .article-content h2 {
    font-size: 1.45rem;
    margin: 1.65rem 0 0.65rem;
    padding-bottom: 0.35rem;
  }
  .article-content h3 {
    font-size: 1.22rem;
    margin: 1.25rem 0 0.5rem;
  }
  .article-content h4 {
    font-size: 1.05rem;
    margin: 1rem 0 0.4rem;
  }
  .article-content hr {
    margin: 1.35rem auto;
  }
  .article-content blockquote {
    font-size: 1.05rem;
    line-height: 1.62;
    padding: 1rem 1.15rem;
    margin: 1.35rem 0;
    border-radius: 0 10px 10px 0;
  }
  .article-content ul,
  .article-content ol {
    margin: 1rem 0 1.35rem 1.35rem;
  }
  .article-nav-grid {
    grid-template-columns: 1fr;
  }
  .nav-brand-link {
    display: none;
  }
  .back-to-top {
    bottom: 1.25rem;
    right: 1.25rem;
    width: 42px;
    height: 42px;
  }
}