/* ==========================================================================
   INDONESIA LOWGUIDE - DESIGN DNA: D-02DFFB-09
   Archetype: Archetype Structured Reference Hub
   Layout: Layout Swiss Grid (Left-aligned, mathematically rigorous)
   Navigation: Nav Large Editorial (Huge typographic logo, ~20vh, mega-menu, non-sticky)
   Hero: Hero Statistical (3 massive data points, brief explanatory text)
   Typography: Type Large Modern Sans
   Color Palette: Charcoal Peach (#F8F8F8, #FFFFFF, #171717, #525252, #F97316, #E5E5E5, #F0F0F0, #EA580C)
   Grid: Grid Asymmetric 10
   Cards: Cards Soft Panel
   Sections: Sections Storytelling
   ========================================================================== */

:root {
  /* Colors */
  --bg-primary: #F8F8F8;
  --surface: #FFFFFF;
  --text-primary: #171717;
  --text-secondary: #525252;
  --accent: #F97316;
  --border: #E5E5E5;
  --bg-muted: #F0F0F0;
  --interactive: #EA580C;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-serif: ui-serif, Georgia, Cambria, 'Times New Roman', Times, serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Container */
  --container-max: 1240px;
  --gutter: 2rem;
  --radius-subtle: 4px;
}

/* Bulletproof base reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  overflow-x: hidden;
  width: 100%;
}

body {
  width: 100%;
  overflow-x: hidden;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1.25rem; /* 20px */
  line-height: 1.5;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: left; /* Swiss Grid: Left-align EVERYTHING */
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -9999px;
  left: 1rem;
  background: var(--text-primary);
  color: var(--surface);
  padding: 0.75rem 1.5rem;
  z-index: 99999;
  text-decoration: none;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-subtle);
}
.skip-link:focus {
  top: 1rem;
}

/* Typographic Scale */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  color: var(--text-primary);
  text-align: left;
  letter-spacing: -0.03em;
  word-wrap: break-word;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1.0;
  font-weight: 800;
  margin-bottom: 1.5rem;
}

h2 {
  font-size: clamp(2rem, 4.5vw, 3rem);
  line-height: 1.05;
  font-weight: 800;
  margin-bottom: 1.25rem;
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.15;
  font-weight: 800;
  margin-bottom: 1rem;
}

h4 {
  font-size: 1.35rem;
  line-height: 1.3;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

p {
  font-size: 1.25rem;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  max-width: 72ch; /* Maximum reading comfort */
  text-align: left;
}

p.lead {
  font-size: 1.45rem;
  line-height: 1.45;
  color: var(--text-primary);
  font-weight: 500;
}

a {
  color: var(--interactive);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1.5px;
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

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

a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

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

/* ==========================================================================
   CANONICAL LAYOUT TAGS (Styled Directly)
   header, nav, main, section, article, footer, aside
   ========================================================================== */

/* HEADER & NAV: Nav Large Editorial (Huge typographic logo, ~20vh, non-sticky) */
header {
  width: 100%;
  min-height: 20vh;
  background-color: var(--surface);
  border-bottom: 2px solid var(--border);
  padding: 2.5rem var(--gutter) 1.5rem var(--gutter);
  position: relative; /* Not sticky! Scrolls out of view */
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.header-top {
  max-width: var(--container-max);
  width: 100%;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 1rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 1.5rem;
}

.brand-title {
  font-size: clamp(2.2rem, 5.5vw, 4.2rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 0.95;
  color: var(--text-primary);
  text-decoration: none;
  text-transform: uppercase;
}

.brand-meta {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  border-left: 2px solid var(--accent);
  padding-left: 0.75rem;
}

/* Mobile Nav Toggle */
.menu-toggle {
  display: none;
  background: var(--bg-muted);
  border: 1px solid var(--border);
  padding: 0.6rem 1rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  color: var(--text-primary);
  min-height: 44px;
  min-width: 44px;
}

/* NAV: Structured Mega-Menu / Large Editorial Navigation */
nav {
  max-width: var(--container-max);
  width: 100%;
  margin: 1.25rem auto 0 auto;
}

.nav-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 2rem;
}

.nav-links li a {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.4rem 0;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
  display: inline-block;
  min-height: 44px;
  line-height: 44px;
}

.nav-links li a:hover {
  color: var(--interactive);
  border-bottom-color: var(--accent);
}

.nav-links li a[aria-current="page"] {
  color: var(--interactive);
  border-bottom-color: var(--interactive);
}

/* MAIN Container */
main {
  width: 100%;
  max-width: 100%;
  min-height: 70vh;
}

/* SECTIONS: Sections Storytelling with Swiss Grid Layout */
section {
  width: 100%;
  padding: clamp(3.5rem, 8vw, 6.5rem) var(--gutter);
  border-bottom: 1px solid var(--border);
  background-color: var(--bg-primary);
}

section.surface-bg {
  background-color: var(--surface);
}

section.muted-bg {
  background-color: var(--bg-muted);
}

.section-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  text-align: left;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 0.75rem;
  display: inline-block;
}

/* ARTICLE: Article Narrative */
article {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: clamp(3rem, 6vw, 5rem) var(--gutter);
}

.reading-column {
  max-width: 72ch;
  margin: 0;
  text-align: left;
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.article-meta-item strong {
  color: var(--text-primary);
}

.pull-quote {
  border-left: 4px solid var(--accent);
  padding: 1.5rem 0 1.5rem 2rem;
  margin: 2.5rem 0;
  background-color: var(--bg-muted);
  font-size: 1.5rem;
  line-height: 1.4;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
}

.pull-quote cite {
  display: block;
  font-size: 0.95rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  margin-top: 0.75rem;
  font-style: normal;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* FOOTER: Footer Reference System (Academic/structured reference) */
footer {
  width: 100%;
  background-color: #111111;
  color: #BDBDBD;
  border-top: 3px solid var(--accent);
  padding: clamp(3.5rem, 6vw, 5.5rem) var(--gutter) 2.5rem var(--gutter);
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  text-align: left;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3.5rem;
  border-bottom: 1px solid #2B2B2B;
}

.footer-col h4 {
  color: #FFFFFF;
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 1.25rem;
  border-left: 2px solid var(--accent);
  padding-left: 0.5rem;
}

.footer-col p {
  color: #9E9E9E;
  font-size: 0.95rem;
  line-height: 1.6;
}

.footer-nav {
  list-style: none;
}

.footer-nav li {
  margin-bottom: 0.75rem;
}

.footer-nav li a {
  color: #CCCCCC;
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.15s ease;
}

.footer-nav li a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.footer-reference-block {
  padding: 2rem 0;
  border-bottom: 1px solid #2B2B2B;
  font-size: 0.85rem;
  line-height: 1.7;
  color: #888888;
}

.footer-reference-block strong {
  color: #E0E0E0;
}

.footer-bottom {
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: #777777;
}

.footer-bottom a {
  color: #9E9E9E;
}

/* ==========================================================================
   HERO: Hero Statistical (3 massive data points + explanatory text)
   ========================================================================== */
.hero-statistical {
  width: 100%;
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: clamp(3rem, 6vw, 5rem) var(--gutter);
}

.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 3rem;
}

.stat-item {
  text-align: left;
  border-left: 3px solid var(--accent);
  padding-left: 1.5rem;
}

.stat-number {
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 900;
  line-height: 0.95;
  color: var(--text-primary);
  font-family: var(--font-sans);
  letter-spacing: -0.04em;
  margin-bottom: 0.5rem;
}

.stat-number span {
  color: var(--accent);
}

.stat-label {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 0.5rem;
}

.stat-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 0;
}

.hero-narrative-split {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-lead-text h1 {
  margin-bottom: 1.25rem;
}

.hero-media-wrap {
  position: relative;
  border: 1px solid var(--border);
  background-color: var(--bg-muted);
}

.hero-media-wrap img {
  width: 100%;
  height: 380px;
  object-fit: cover;
  filter: contrast(1.05) saturate(0.9);
}

.hero-media-caption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  padding: 0.6rem 0.8rem;
  background-color: var(--surface);
  border-top: 1px solid var(--border);
  text-align: left;
}

/* ==========================================================================
   GRID ASYMMETRIC 10 & SWISS GRID LAYOUT COMPONENTS
   ========================================================================== */
.grid-asymmetric-10 {
  display: grid;
  grid-template-columns: 6fr 4fr;
  gap: 2.5rem;
}

.grid-3-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.grid-2-col {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem;
}

.grid-4-col {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

/* ==========================================================================
   CARDS: Cards Soft Panel
   Subtle bg shift, delicate 1px border, generous internal padding
   ========================================================================== */
.card-soft-panel {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-subtle);
  padding: 2rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-align: left;
}

.card-soft-panel:hover {
  border-color: var(--accent);
}

.card-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.card-soft-panel h3 {
  font-size: 1.6rem;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.card-soft-panel p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 1.5rem;
}

.card-meta {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}

/* ==========================================================================
   CTA: Cta Contextual
   Quiet confidence, high contrast accent button, ample whitespace
   ========================================================================== */
.cta-contextual-box {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-left: 6px solid var(--accent);
  padding: 3rem 2.5rem;
  margin: 3.5rem 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--accent);
  color: #FFFFFF;
  font-family: var(--font-sans);
  font-size: 1.1rem;
  font-weight: 700;
  padding: 0.9rem 2rem;
  min-height: 48px;
  min-width: 48px;
  border-radius: var(--radius-subtle);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.15s ease;
}

.btn-primary:hover {
  background-color: var(--interactive);
  color: #FFFFFF;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1.1rem;
  font-weight: 600;
  padding: 0.85rem 1.75rem;
  min-height: 48px;
  border: 1px solid var(--border);
  border-radius: var(--radius-subtle);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s ease;
}

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

/* ==========================================================================
   DATA TABLES (Swiss Rigorous Academic)
   ========================================================================== */
.table-wrapper {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 2rem 0;
  border: 1px solid var(--border);
  background: var(--surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 1.05rem;
}

thead {
  background-color: var(--bg-muted);
  border-bottom: 2px solid var(--border);
}

th {
  padding: 1rem 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  font-family: var(--font-mono);
}

td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background-color: var(--bg-primary);
}

/* ==========================================================================
   FORMS & INPUTS
   ========================================================================== */
.form-group {
  margin-bottom: 1.75rem;
  text-align: left;
}

label {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

input[type="text"],
input[type="email"],
input[type="tel"],
select,
textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  font-family: var(--font-sans);
  font-size: 1.1rem;
  color: var(--text-primary);
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-subtle);
  transition: border-color 0.2s ease;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--accent);
}

.form-error {
  color: #DC2626;
  font-size: 0.85rem;
  margin-top: 0.35rem;
  display: none;
}

.form-success {
  display: none;
  background-color: #ECFDF5;
  border: 1px solid #10B981;
  color: #065F46;
  padding: 1.25rem;
  border-radius: var(--radius-subtle);
  margin-top: 1.5rem;
}

/* ==========================================================================
   ACCORDIONS (FAQ)
   ========================================================================== */
details {
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 0;
  text-align: left;
}

summary {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  font-size: 1.6rem;
  font-weight: 400;
  color: var(--accent);
  transition: transform 0.2s ease;
}

details[open] summary::after {
  content: "−";
}

details p {
  margin-top: 1rem;
  margin-bottom: 0.5rem;
  font-size: 1.15rem;
}

/* ==========================================================================
   CHECKLIST INTERACTIVE
   ========================================================================== */
.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-subtle);
  margin-bottom: 1rem;
  cursor: pointer;
}

.checklist-item input[type="checkbox"] {
  width: 22px;
  height: 22px;
  accent-color: var(--accent);
  margin-top: 0.2rem;
  cursor: pointer;
}

.checklist-content h4 {
  margin-bottom: 0.3rem;
  font-size: 1.2rem;
}

.checklist-content p {
  margin-bottom: 0;
  font-size: 1rem;
}

/* ==========================================================================
   BREADCRUMBS
   ========================================================================== */
.breadcrumbs {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.breadcrumbs a {
  color: var(--text-secondary);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--interactive);
  text-decoration: underline;
}

.breadcrumbs span[aria-current="page"] {
  color: var(--accent);
  font-weight: 700;
}

/* ==========================================================================
   SVG DIAGRAM CONTAINERS (Strictly allowed for schematics/educational charts)
   ========================================================================== */
.diagram-container {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 2rem;
  margin: 2.5rem 0;
  text-align: left;
}

.diagram-caption {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

/* ==========================================================================
   MOBILE LARGE TYPE BREAKPOINT SYSTEM
   Strict mobile responsiveness: 320px, 375px, 768px, 1024px+
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-stats-grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }
  
  .hero-narrative-split {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .grid-asymmetric-10 {
    grid-template-columns: 1fr;
  }

  .grid-3-col {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 768px) {
  :root {
    --gutter: 1.25rem;
  }

  body {
    font-size: 1.15rem; /* Large readable mobile type */
  }

  header {
    min-height: auto;
    padding: 1.5rem var(--gutter);
  }

  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  /* Collapsible mobile navigation */
  .nav-links {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    padding: 1.5rem 0 0.5rem 0;
    gap: 0.75rem;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links li {
    width: 100%;
    border-bottom: 1px solid var(--border);
  }

  .nav-links li a {
    width: 100%;
    padding: 0.75rem 0;
    font-size: 1.15rem;
  }

  .grid-3-col, .grid-2-col, .grid-4-col {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .cta-contextual-box {
    padding: 2rem 1.5rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 2.35rem;
  }

  h2 {
    font-size: 1.85rem;
  }

  h3 {
    font-size: 1.4rem;
  }

  .btn-primary, .btn-secondary {
    width: 100%;
  }
}