/* ==========================================================================
   ARRHETA.COM — Official Channel Home Stylesheet (Release V1)
   Theme: Archival Dark / Documentary Cinematic
   Language: Thai & English Typography
   ========================================================================== */

:root {
  /* Color Palette */
  --bg-deep: #080a0d;
  --bg-surface: #0e1217;
  --bg-surface-elevated: #151b22;
  --bg-card: rgba(18, 24, 32, 0.85);
  --bg-card-hover: rgba(28, 38, 52, 0.95);

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-medium: rgba(255, 255, 255, 0.16);
  --border-focus: rgba(226, 183, 116, 0.6);

  --text-primary: #f0f2f5;
  --text-secondary: #a0aec0;
  --text-muted: #7b8794;
  --text-accent: #e2b774;

  --crimson-accent: #b93838;
  --crimson-glow: rgba(185, 56, 56, 0.35);

  /* Typography */
  --font-serif: "Noto Serif Thai", Georgia, "Times New Roman", serif;
  --font-sans: "Prompt", "Sarabun", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  /* Spacing & Radii */
  --container-max: 1140px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --transition: all 0.25s ease;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  font-weight: 300;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: radial-gradient(circle at 50% 0%, #121824 0%, #080a0d 65%);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Subtle archival texture */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  background-image: radial-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 0);
  background-size: 28px 28px;
  opacity: 0.5;
  z-index: 999;
}

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

a:hover {
  color: #f7d794;
  text-decoration: underline;
}

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

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(8, 10, 13, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand-identity {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo-text {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-primary);
  text-decoration: none;
}

.brand-logo-text:hover {
  text-decoration: none;
  color: var(--text-accent);
}

.brand-dot {
  color: var(--crimson-accent);
}

.brand-subtitle-badge {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.nav-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background-color: rgba(255, 255, 255, 0.06);
  text-decoration: none;
}

.nav-link-cta {
  background-color: var(--crimson-accent);
  color: #ffffff !important;
  font-weight: 500;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-sm);
}

.nav-link-cta:hover {
  background-color: #d14343;
  text-decoration: none;
}

/* Hero Section */
.hero-section {
  position: relative;
  padding: 3.5rem 0 3rem;
  overflow: hidden;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-banner-container {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-medium);
  margin-bottom: 2rem;
  background-color: var(--bg-surface);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.5);
}

.hero-banner-img {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  display: block;
}

.hero-content {
  max-width: 820px;
  margin: 0 auto;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-accent);
  background-color: rgba(226, 183, 116, 0.1);
  border: 1px solid rgba(226, 183, 116, 0.25);
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  margin-bottom: 1.25rem;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  letter-spacing: 0.02em;
}

.hero-subtagline {
  font-size: 1.15rem;
  color: var(--text-accent);
  margin-bottom: 1.25rem;
  font-weight: 400;
}

.hero-lead {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background-color: var(--crimson-accent);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  background-color: #d14343;
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px var(--crimson-glow);
}

.btn-secondary {
  background-color: var(--bg-surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: #ffffff;
  transform: translateY(-2px);
}

/* Sections */
.section {
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  margin-bottom: 2.5rem;
  text-align: center;
}

.section-tag {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-accent);
  margin-bottom: 0.5rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

/* Documentary Grid & Cards */
.documentary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.doc-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.doc-card:hover {
  border-color: var(--border-medium);
  background-color: var(--bg-card-hover);
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.4);
}

.doc-card-thumb-wrap {
  position: relative;
  overflow: hidden;
  background-color: #000;
  aspect-ratio: 16 / 9;
}

.doc-card-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.doc-card:hover .doc-card-thumb {
  transform: scale(1.03);
}

.doc-badge-duration {
  position: absolute;
  bottom: 0.75rem;
  right: 0.75rem;
  background-color: rgba(0, 0, 0, 0.85);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.doc-badge-series {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  background-color: rgba(185, 56, 56, 0.88);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  letter-spacing: 0.05em;
}

.doc-card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.doc-code {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-accent);
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}

.doc-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.doc-synopsis {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex: 1;
}

.doc-highlights {
  list-style: none;
  font-size: 0.825rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-subtle);
  padding-top: 0.75rem;
  margin-bottom: 1.25rem;
}

.doc-highlights li {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 0.35rem;
}

.doc-highlights li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--text-accent);
}

.doc-card-footer {
  margin-top: auto;
}

/* Philosophy / Principles Grid */
.principles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.principle-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: var(--transition);
}

.principle-card:hover {
  border-color: var(--border-focus);
}

.principle-icon {
  font-size: 1.75rem;
  margin-bottom: 1rem;
  display: inline-block;
}

.principle-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-accent);
  margin-bottom: 0.5rem;
}

.principle-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Digital Projects & Origin Section */
.meta-callout-box {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-medium);
  border-left: 4px solid var(--text-accent);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.75rem;
  margin: 1.5rem 0;
}

.meta-callout-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.meta-callout-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Page Layout for Legal & Policy Docs */
.doc-page-container {
  max-width: 780px;
  margin: 0 auto;
  padding: 3rem 1.25rem 5rem;
}

.doc-page-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}

.doc-page-title {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.doc-page-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.doc-article h2 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text-accent);
  margin: 2rem 0 0.75rem;
}

.doc-article p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.doc-article ul {
  margin: 0 0 1.25rem 1.5rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.doc-article li {
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

/* 404 Page */
.error-page-wrap {
  text-align: center;
  padding: 5rem 1.25rem;
  max-width: 600px;
  margin: 0 auto;
}

.error-code {
  font-family: var(--font-serif);
  font-size: 5rem;
  font-weight: 700;
  color: var(--text-accent);
  line-height: 1;
  margin-bottom: 1rem;
}

.error-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.error-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 2rem;
}

/* Global Footer */
.site-footer {
  margin-top: auto;
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 3rem 0 2rem;
  font-size: 0.875rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.footer-brand h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.footer-brand p {
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1rem;
  max-width: 480px;
}

.footer-col h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-accent);
  margin-bottom: 1rem;
}

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

.footer-links li {
  margin-bottom: 0.6rem;
}

.footer-links a {
  color: var(--text-secondary);
  transition: var(--transition);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.8rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: rgba(255, 255, 255, 0.04);
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .hero-title {
    font-size: 1.75rem;
  }
  .hero-subtagline {
    font-size: 1rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }
  .nav-wrap {
    flex-direction: column;
    align-items: flex-start;
  }
  .nav-links {
    width: 100%;
    justify-content: flex-start;
    gap: 0.5rem;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .btn {
    width: 100%;
  }
}

/* Release V1.1 (lead fix): replaces inline style attributes blocked by CSP style-src 'self' */
.btn-block { width: 100%; }
.meta-callout-spaced { margin-top: 2.5rem; }
.brand-dot { color: var(--crimson-accent); }