/* ==========================================================================
   Thailand Guideds - Core Stylesheet
   Design DNA: D-008B9F-00 (archetype-human-centered-storytelling)
   Layout: layout-dense-reference | Nav: nav-minimal-centered | Hero: hero-guide-introduction
   Typography: type-humanist-sans | Color: color-forest-ivory
   ========================================================================== */

/* 1. CSS Custom Properties / Tokens */
:root {
  /* Fonts */
  --font-sans: 'Open Sans', 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
  --font-serif: ui-serif, Georgia, serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Color System: color-forest-ivory */
  --color-bg: #F4F5F0;
  --color-surface: #FFFFFF;
  --color-text-primary: #14261C;
  --color-text-secondary: #4A5D52;
  --color-accent: #15803D;
  --color-border: #D3DBD6;
  --color-bg-muted: #E6EBE7;
  --color-interactive: #166534;
  --color-focus-ring: #15803D;

  /* Semantic Alerts / Badges */
  --color-status-safe: #15803D;
  --color-status-warning: #B45309;
  --color-status-danger: #B91C1C;
  --color-status-neutral: #4A5D52;

  /* Spacing Tokens (Dense Reference layout) */
  --space-2xs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 80px;

  /* Layout Widths */
  --container-max: 1180px;
  --text-max: 75ch;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition: all 0.2s ease-in-out;
}

/* 2. Global Resets & Mobile-first Baseline */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  overflow-x: hidden;
  width: 100%;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--color-bg);
}

body {
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  font-weight: 400;
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Accessible Skip Link */
.skip-link {
  position: absolute;
  top: -60px;
  left: 16px;
  background: var(--color-text-primary);
  color: var(--color-surface);
  padding: 12px 20px;
  z-index: 9999;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 16px;
  outline: 3px solid var(--color-accent);
}

/* Focus styling */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--color-focus-ring);
  outline-offset: 2px;
}

/* 3. Typography Assignments (type-humanist-sans) */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  color: var(--color-text-primary);
  font-weight: 600;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2rem);
  line-height: 1.25;
  margin-bottom: var(--space-sm);
}

h3 {
  font-size: clamp(1.25rem, 2.2vw, 1.5rem);
  line-height: 1.3;
  margin-bottom: var(--space-xs);
}

h4 {
  font-size: 1.15rem;
  line-height: 1.4;
  margin-bottom: var(--space-2xs);
}

p {
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
}

p.lead {
  font-size: 1.1875rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
  max-width: var(--text-max);
}

small, .text-muted {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

strong {
  font-weight: 600;
  color: var(--color-text-primary);
}

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: var(--transition);
}

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

/* Media baseline */
img, svg, video, iframe, canvas {
  max-width: 100%;
  height: auto;
  display: block;
}

/* 4. Global Raw Semantic Layout Containers (Direct tag styling per rule 34) */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  background-color: rgba(244, 245, 240, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-sm) var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}

/* nav-minimal-centered: Centered Logo with symmetrically placed navigation */
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  text-decoration: none;
  color: var(--color-text-primary);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.site-brand svg {
  width: 26px;
  height: 26px;
}

nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-group-left, .nav-group-right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  list-style: none;
}

nav a {
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

nav a:hover,
nav a.active {
  color: var(--color-accent);
  background-color: rgba(21, 128, 61, 0.08);
  text-decoration: none;
}

nav a.active {
  font-weight: 600;
}

.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  cursor: pointer;
  color: var(--color-text-primary);
  font-size: 0.9375rem;
  font-family: inherit;
  font-weight: 600;
}

.nav-backdrop {
  display: none;
}

main {
  display: block;
  width: 100%;
  min-height: calc(100vh - 350px);
}

section {
  width: 100%;
  padding: var(--space-3xl) var(--space-md);
  position: relative;
}

section.zone-surface {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

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

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

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

.section-header {
  margin-bottom: var(--space-xl);
  max-width: var(--text-max);
}

.section-header p {
  color: var(--color-text-secondary);
  font-size: 1.0625rem;
  margin-bottom: 0;
}

.section-label {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

article {
  max-width: var(--text-max);
  margin: 0 auto;
}

aside {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
}

footer {
  width: 100%;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-3xl) var(--space-md) var(--space-xl);
  color: var(--color-text-secondary);
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--space-2xl);
}

.footer-brand h2 {
  font-size: 1.4rem;
  margin-bottom: var(--space-xs);
  color: var(--color-text-primary);
}

.footer-brand p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  max-width: 380px;
}

.footer-col h3 {
  font-size: 0.9375rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: var(--space-xs);
}

.footer-col a {
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

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

.footer-bottom {
  max-width: var(--container-max);
  margin: var(--space-2xl) auto 0;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: 0.875rem;
}

/* 5. Hero Component (hero-guide-introduction) */
.hero-guide {
  background: linear-gradient(180deg, var(--color-bg) 0%, rgba(230, 235, 231, 0.6) 100%);
  padding: var(--space-3xl) var(--space-md) var(--space-2xl);
  border-bottom: 1px solid var(--color-border);
}

.hero-inner {
  max-width: var(--container-max);
  margin: 0 auto;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  list-style: none;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

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

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

.breadcrumb-separator {
  color: var(--color-border);
}

.hero-layout-split {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-2xl);
  align-items: center;
  margin-top: var(--space-lg);
}

.hero-search-wrapper {
  margin: var(--space-lg) 0;
  position: relative;
  max-width: 580px;
}

.hero-search-input {
  width: 100%;
  padding: 14px 16px 14px 44px;
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.hero-search-input:focus {
  border-color: var(--color-accent);
}

.hero-search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-secondary);
  pointer-events: none;
}

.quick-topics {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-xs);
}

.quick-topic-label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  font-weight: 600;
}

.topic-tag {
  display: inline-block;
  padding: 4px 10px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-size: 0.8125rem;
  color: var(--color-text-primary);
  text-decoration: none;
  transition: var(--transition);
}

.topic-tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}

/* Single Photographic Asset Presentation Container */
.hero-image-frame {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  box-shadow: 0 4px 16px rgba(20, 38, 28, 0.05);
}

.hero-image-frame img {
  width: 100%;
  height: 380px;
  object-fit: cover;
  object-position: center 30%;
  transition: transform 0.4s ease;
}

.hero-image-caption {
  padding: var(--space-xs) var(--space-sm);
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* 6. Grid & Card System (Cards Layered) */
.grid {
  display: grid;
  gap: var(--space-lg);
}

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

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

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.card:hover {
  border-color: #B8C5BD;
  box-shadow: 0 4px 12px rgba(20, 38, 28, 0.06);
}

.card-header {
  margin-bottom: var(--space-sm);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: var(--space-xs);
  line-height: 1.3;
}

.card-title a {
  text-decoration: none;
  color: var(--color-text-primary);
}

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

.card-body {
  flex-grow: 1;
}

.card-footer {
  margin-top: var(--space-md);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-bg-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-icon-header {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background-color: var(--color-bg-muted);
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

/* Quote & Editorial Callout (Human Story archetype) */
.editorial-quote {
  border-left: 4px solid var(--color-accent);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-xl) 0;
  background-color: var(--color-surface);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  border-top: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.editorial-quote blockquote {
  font-size: 1.25rem;
  font-weight: 500;
  line-height: 1.5;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.editorial-quote cite {
  display: block;
  font-size: 0.875rem;
  font-style: normal;
  color: var(--color-text-secondary);
}

/* 7. Button & CTA System (Cta Minimal) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 10px 20px;
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: inherit;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  min-height: 44px;
  transition: var(--transition);
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-surface);
  border: 1px solid var(--color-accent);
}

.btn-primary:hover {
  background-color: var(--color-interactive);
  border-color: var(--color-interactive);
  color: var(--color-surface);
  text-decoration: none;
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-text-primary);
  background-color: var(--color-surface);
  text-decoration: none;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.875rem;
  min-height: 36px;
}

/* Status Badges */
.status-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.status-safe {
  background-color: rgba(21, 128, 61, 0.12);
  color: var(--color-status-safe);
}

.status-warning {
  background-color: rgba(180, 83, 9, 0.12);
  color: var(--color-status-warning);
}

.status-danger {
  background-color: rgba(185, 28, 28, 0.12);
  color: var(--color-status-danger);
}

.status-neutral {
  background-color: rgba(74, 93, 82, 0.12);
  color: var(--color-status-neutral);
}

/* 8. Forms & Inputs */
.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  transition: var(--transition);
}

.form-control:focus {
  border-color: var(--color-accent);
  outline: 2px solid var(--color-accent);
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

.alert-box {
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-md);
  font-size: 0.9375rem;
}

.alert-success {
  background-color: #ECFDF5;
  border: 1px solid #A7F3D0;
  color: #065F46;
}

.alert-error {
  background-color: #FEF2F2;
  border: 1px solid #FECACA;
  color: #991B1B;
}

.alert-info {
  background-color: #F0FDF4;
  border: 1px solid #BBF7D0;
  color: #166534;
}

/* 9. Interactive Checklist Component */
.checklist-container {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
}

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-bg-muted);
}

.checklist-item:last-child {
  border-bottom: none;
}

.checklist-item input[type="checkbox"] {
  width: 22px;
  height: 22px;
  margin-top: 2px;
  accent-color: var(--color-accent);
  cursor: pointer;
  flex-shrink: 0;
}

.checklist-label {
  cursor: pointer;
}

.checklist-label-title {
  font-weight: 600;
  color: var(--color-text-primary);
  display: block;
  margin-bottom: 2px;
}

.checklist-label-desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.assessment-result-panel {
  background-color: var(--color-bg-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-top: var(--space-xl);
}

.progress-track {
  width: 100%;
  height: 8px;
  background-color: var(--color-border);
  border-radius: 4px;
  overflow: hidden;
  margin: var(--space-xs) 0 var(--space-md);
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background-color: var(--color-accent);
  transition: width 0.3s ease;
}

/* 10. Table & Accordion Formatting */
.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  margin: var(--space-md) 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9375rem;
}

th, td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
}

th {
  background-color: var(--color-bg-muted);
  font-weight: 600;
  color: var(--color-text-primary);
}

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

details {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  margin-bottom: var(--space-xs);
  transition: var(--transition);
}

details[open] {
  border-color: var(--color-accent);
}

summary {
  padding: 14px 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

summary::after {
  content: "+";
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-accent);
}

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

.details-content {
  padding: 0 16px 16px;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  border-top: 1px solid var(--color-bg-muted);
  padding-top: var(--space-sm);
}

/* 11. Responsive Rules (Mobile-first transformation) */
@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 840px) {
  .menu-toggle {
    display: inline-flex;
  }

  nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    height: 100vh;
    background-color: var(--color-surface);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-3xl) var(--space-lg);
    box-shadow: -4px 0 20px rgba(0,0,0,0.1);
    transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    overflow-y: auto;
  }

  nav.nav-open {
    right: 0;
  }

  .nav-group-left, .nav-group-right {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: var(--space-xs);
  }

  nav a {
    width: 100%;
    padding: 10px 14px;
    font-size: 1.0625rem;
  }

  .nav-backdrop {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(20, 38, 28, 0.5);
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
  }

  .nav-backdrop.active {
    opacity: 1;
    pointer-events: auto;
  }

  .hero-layout-split {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .hero-image-frame img {
    height: 280px;
  }

  .grid-3 {
    grid-template-columns: 1fr;
  }

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

  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}