/* =========================================================
   Boorapatis Ploysuwan — Stylesheet
   โทนสี: navy ink + indigo + warm gold + teal + terracotta
   ฟอนต์: Noto Serif Thai (display) + Noto Sans Thai (body)
   ========================================================= */

:root {
  /* ---- Color tokens ---- */
  --color-ink: #14213D;        /* navy หลัก: header, ข้อความเข้ม */
  --color-indigo: #3A4F7A;     /* รอง: ลิงก์, accent */
  --color-gold: #C9A227;       /* CTA / ไฮไลต์ */
  --color-gold-text: #7A6018;  /* eyebrow บนพื้นอ่อน — ผ่าน WCAG AA */
  --color-paper: #F7F5F0;      /* พื้นหลังโทนอุ่น */
  --color-white: #FFFFFF;
  --color-text: #262B36;
  --color-text-soft: #5B6170;
  --color-border: rgba(20, 33, 61, 0.12);

  /* ---- Channel accent colors (encode content category) ---- */
  --color-channel-1: #3A4F7A;  /* Global Trend Signals: indigo = เทคโนโลยี/แนวโน้ม */
  --color-channel-2: #C9A227;  /* The Century Bridge: gold = อบอุ่น/ข้ามรุ่น */
  --color-channel-3: #1F6F66;  /* Tham Dee Music: teal = สร้างสรรค์ */
  --color-channel-4: #B5533C;  /* TikTok: terracotta = สั้น กระชับ มีพลัง */

  /* ---- Type ---- */
  --font-display: 'Noto Serif Thai', 'Times New Roman', serif;
  --font-body: 'Noto Sans Thai', system-ui, -apple-system, sans-serif;

  /* ---- Layout ---- */
  --container-w: 1140px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-soft: 0 10px 30px rgba(20, 33, 61, 0.08);
  --shadow-hover: 0 16px 40px rgba(20, 33, 61, 0.14);
  --transition: 220ms ease;
}

/* ---------------------------------------------------------
   Reset & base
   --------------------------------------------------------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }

h1, h2, h3 {
  font-family: var(--font-display);
  color: var(--color-ink);
  line-height: 1.3;
  margin: 0 0 0.6em;
}

h1 { font-size: clamp(2rem, 4.4vw, 3.1rem); font-weight: 600; }
h2 { font-size: clamp(1.5rem, 2.8vw, 2.1rem); font-weight: 600; }
h3 { font-size: 1.15rem; font-weight: 600; margin-bottom: 0.4em; }

p { margin: 0 0 1em; color: var(--color-text-soft); }

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

ul, ol { margin: 0; padding: 0; }

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px;
}
.container.narrow { max-width: 760px; }

.section { padding: 88px 0; }

.eyebrow {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-gold-text);
  text-transform: uppercase;
  margin: 0 0 0.8em;
}

.section-head { max-width: 640px; margin: 0 auto 48px; text-align: center; }
.section-head.reveal, .container.narrow.reveal { text-align: left; }
.section .section-head { text-align: center; }
.section-lead { font-size: 1.05rem; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-ink);
  color: var(--color-white);
  padding: 10px 16px;
  z-index: 200;
}
.skip-link:focus { left: 12px; top: 12px; }

/* Visible focus state for accessibility */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--color-gold);
  outline-offset: 2px;
}

/* ---------------------------------------------------------
   Buttons
   --------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.98rem;
  padding: 13px 26px;
  border-radius: 999px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
}
.btn:hover { transform: translateY(-2px); }

.btn-primary {
  background: var(--color-ink);
  color: var(--color-white);
  box-shadow: var(--shadow-soft);
}
.btn-primary:hover { background: #1c2d52; box-shadow: var(--shadow-hover); }

.btn-ghost {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-border);
}
.btn-ghost:hover { background: var(--color-paper); }

.btn-outline {
  background: transparent;
  color: var(--accent, var(--color-indigo));
  border-color: var(--accent, var(--color-indigo));
  font-size: 0.92rem;
  padding: 10px 20px;
}
.btn-outline:hover { background: var(--accent, var(--color-indigo)); color: var(--color-white); }

.btn-small { padding: 9px 18px; font-size: 0.88rem; }

/* ---------------------------------------------------------
   Header / Nav
   --------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.site-header.is-scrolled {
  border-color: var(--color-border);
  box-shadow: 0 4px 18px rgba(20, 33, 61, 0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-ink);
}
.logo-mark {
  flex-shrink: 0;
  line-height: 0;
}
.logo-mark img {
  display: block;
  width: auto;
  height: 40px;
}
.logo-text {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.main-nav ul {
  display: flex;
  gap: 26px;
  list-style: none;
}
.nav-link {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.96rem;
  position: relative;
  padding: 6px 0;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--color-gold);
  transform: scaleX(0);
  transition: transform var(--transition);
}
.nav-link:hover::after,
.nav-link.is-active::after { transform: scaleX(1); }
.nav-link.is-active { color: var(--color-ink); font-weight: 600; }

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
}
.menu-toggle span {
  display: block;
  height: 2px;
  background: var(--color-ink);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------------------------------------------------------
   Hero
   --------------------------------------------------------- */
.hero {
  position: relative;
  padding: 96px 0 0;
  overflow: hidden;
  background: linear-gradient(180deg, var(--color-paper) 0%, var(--color-white) 100%);
}
.hero-inner { position: relative; z-index: 2; max-width: 760px; padding-bottom: 64px; }

.hero-bg { position: absolute; inset: 0; z-index: 1; }
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.35;
}
.blob-1 {
  width: 420px; height: 420px;
  background: radial-gradient(circle, var(--color-gold), transparent 70%);
  top: -120px; right: -80px;
}
.blob-2 {
  width: 360px; height: 360px;
  background: radial-gradient(circle, var(--color-indigo), transparent 70%);
  bottom: -160px; right: 220px;
}

.hero-title { margin-bottom: 0.5em; }
.hero-lead { font-size: 1.1rem; max-width: 620px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 28px; }

/* Signal / waveform divider — signature element bridging
   "Global Trend Signals" (data signal) and "Tham Dee Music" (waveform) */
.signal-divider {
  position: relative;
  color: var(--color-gold);
  line-height: 0;
}
.signal-divider-alt { color: var(--color-border); }
.signal-svg { width: 100%; height: 56px; display: block; }
.signal-dot { color: var(--color-ink); }

@media (prefers-reduced-motion: reduce) {
  .signal-dot animateMotion { display: none; }
  .btn:hover,
  .channel-card:hover,
  .pillar-card:hover,
  .promo-card:hover { transform: none; }
}

/* ---------------------------------------------------------
   About
   --------------------------------------------------------- */
.about { background: var(--color-white); }

/* ---------------------------------------------------------
   Channels
   --------------------------------------------------------- */
.channels { background: var(--color-paper); }

.channel-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.channel-card {
  background: color-mix(in srgb, var(--accent) 10%, var(--color-white));
  border-radius: var(--radius-lg);
  padding: 32px;
  border-top: 4px solid var(--accent);
  border-left: 1px solid color-mix(in srgb, var(--accent) 18%, transparent);
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  display: flex;
  flex-direction: column;
}
.channel-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  background: color-mix(in srgb, var(--accent) 14%, var(--color-white));
}

.channel-icon { font-size: 1.8rem; margin-bottom: 14px; }
.channel-type {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--accent) 55%, var(--color-ink));
  margin-bottom: 6px;
}
.channel-card h3 { margin-bottom: 0.5em; }
.th-name { font-family: var(--font-body); font-weight: 400; font-size: 0.95rem; color: var(--color-text-soft); }
.channel-desc { flex-grow: 1; }
.channel-audience { font-size: 0.92rem; }
.channel-card .btn-outline { margin-top: auto; align-self: flex-start; }

/* ---------------------------------------------------------
   Mission
   --------------------------------------------------------- */
.mission-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  list-style: none;
}
.mission-item {
  background: var(--color-paper);
  border-radius: var(--radius-md);
  padding: 28px;
}
.mission-icon { font-size: 1.6rem; display: block; margin-bottom: 12px; }
.mission-item p { margin-bottom: 0; font-size: 0.95rem; }

/* ---------------------------------------------------------
   Content Principles
   --------------------------------------------------------- */
.principles { background: var(--color-paper); }
.principles-list ol {
  list-style: none;
  counter-reset: principle;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px 32px;
  max-width: 880px;
  margin: 0 auto;
}
.principles-list li {
  counter-increment: principle;
  position: relative;
  padding-left: 42px;
  color: var(--color-text);
  font-size: 1rem;
}
.principles-list li::before {
  content: counter(principle, decimal-leading-zero);
  position: absolute;
  left: 0; top: -2px;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-gold);
  font-size: 0.95rem;
}

/* ---------------------------------------------------------
   Qualities (badges)
   --------------------------------------------------------- */
.badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  list-style: none;
}
.badge {
  background: var(--color-white);
  border: 1.5px solid var(--color-border);
  border-radius: 999px;
  padding: 10px 20px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-ink);
}

/* ---------------------------------------------------------
   Featured Content Pillars
   --------------------------------------------------------- */
.pillars { background: var(--color-paper); }
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.pillar-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 28px 22px;
  text-align: center;
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition);
}
.pillar-card:hover { transform: translateY(-3px); }
.pillar-icon { font-size: 1.8rem; display: block; margin-bottom: 12px; }
.pillar-card h3 { font-size: 1rem; margin-bottom: 0; }

/* ---------------------------------------------------------
   Disclaimer
   --------------------------------------------------------- */
.disclaimer-section { padding: 56px 0; }
.disclaimer-box {
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
}
.disclaimer-title { font-size: 1.2rem; }
.disclaimer-box p { font-size: 0.92rem; margin-bottom: 0.9em; }
.disclaimer-box p:last-child { margin-bottom: 0; }

/* ---------------------------------------------------------
   Contact
   --------------------------------------------------------- */
.contact { background: var(--color-white); text-align: left; }
.contact-email { margin: 12px 0 16px; }
.contact-note { font-size: 0.88rem; color: var(--color-text-soft); }

/* ---------------------------------------------------------
   Promo card (linked site)
   --------------------------------------------------------- */
.app-promo { background: var(--color-paper); padding-top: 0; }
.promo-card {
  background: linear-gradient(135deg, color-mix(in srgb, var(--color-indigo) 8%, var(--color-white)) 0%, var(--color-white) 100%);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-indigo);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition), box-shadow var(--transition);
}
.promo-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.promo-card h2 { font-size: clamp(1.25rem, 2.4vw, 1.65rem); margin-bottom: 0.75em; }
.promo-card p { margin-bottom: 1.25em; }
.promo-card .btn { margin-top: 4px; }
.promo-card .btn-outline { --accent: var(--color-indigo); }

/* ---------------------------------------------------------
   Footer
   --------------------------------------------------------- */
.site-footer {
  background: var(--color-ink);
  color: rgba(255, 255, 255, 0.82);
  padding: 56px 0 36px;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 32px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  padding-bottom: 32px;
  margin-bottom: 24px;
}
.footer-name { font-family: var(--font-display); color: var(--color-white); font-size: 1.1rem; margin-bottom: 4px; }
.footer-tagline { font-size: 0.88rem; max-width: 320px; color: rgba(255, 255, 255, 0.65); margin-bottom: 0; }
.footer-links { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.footer-links a { color: rgba(255, 255, 255, 0.82); font-size: 0.92rem; }
.footer-links a:hover { color: var(--color-gold); }
.footer-links a:focus-visible {
  outline-color: var(--color-gold);
  color: var(--color-white);
}
.footer-copy { font-size: 0.84rem; color: rgba(255, 255, 255, 0.55); text-align: center; margin: 0; }

/* ---------------------------------------------------------
   Back to top
   --------------------------------------------------------- */
.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--color-ink);
  color: var(--color-white);
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow-soft);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition), background var(--transition);
  z-index: 90;
}
.back-to-top.is-visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-to-top:hover { background: var(--color-indigo); }

/* ---------------------------------------------------------
   Scroll reveal
   --------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 600ms ease, transform 600ms ease;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------------------------------------------------------
   Responsive
   --------------------------------------------------------- */
@media (max-width: 880px) {
  .channel-grid { grid-template-columns: 1fr; }
  .mission-grid { grid-template-columns: repeat(2, 1fr); }
  .pillars-grid { grid-template-columns: repeat(2, 1fr); }
  .principles-list ol { grid-template-columns: 1fr; }
}

/* ---------------------------------------------------------
   Sub-pages: privacy / terms / content-policy
   --------------------------------------------------------- */
.page-hero {
  padding: 56px 0 36px;
  background: linear-gradient(180deg, var(--color-paper) 0%, var(--color-white) 100%);
}
.breadcrumb { font-size: 0.88rem; margin-bottom: 18px; color: var(--color-text-soft); }
.breadcrumb a { font-weight: 500; }

.last-updated {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--color-text-soft);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 6px 16px;
  margin-top: 6px;
}

.legal-content { padding: 8px 0 90px; }
.legal-content h2 { margin-top: 2.3em; scroll-margin-top: 100px; }
.legal-content > h2:first-child { margin-top: 0; }
.legal-content h3 { color: var(--color-ink); font-size: 1.02rem; margin-top: 1.4em; }
.legal-content ul,
.legal-content ol.legal-list { margin: 0 0 1.2em; padding-left: 1.5em; color: var(--color-text-soft); }
.legal-content li { margin-bottom: 0.55em; }
.legal-content p { margin-bottom: 1.1em; }
.legal-content strong { color: var(--color-ink); }

.toc {
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 26px 28px;
  margin: 8px 0 48px;
}
.toc-title { font-size: 0.98rem; margin-bottom: 0.9em; color: var(--color-ink); font-weight: 600; font-family: var(--font-body); }
.toc ol { list-style: none; counter-reset: toc; padding-left: 0; margin: 0; }
.toc li { margin-bottom: 0.55em; counter-increment: toc; }
.toc li::before { content: counter(toc) ". "; color: var(--color-gold); font-weight: 600; }
.toc a { color: var(--color-text); font-size: 0.95rem; }
.toc a:hover { color: var(--color-indigo); }

.legal-disclaimer-note {
  background: var(--color-paper);
  border-left: 4px solid var(--color-gold);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  font-size: 0.92rem;
  margin-top: 48px;
}
.legal-disclaimer-note p:last-child { margin-bottom: 0; }

.legal-footer-links {
  font-size: 0.92rem;
  color: var(--color-text-soft);
  margin-top: 1.2em;
  margin-bottom: 0;
}

.footer-legal { min-width: 160px; }

@media (max-width: 760px) {
  .menu-toggle { display: flex; }

  .main-nav {
    position: absolute;
    top: 76px;
    left: 0; right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    padding: 18px 24px 26px;
    gap: 18px;
    box-shadow: var(--shadow-soft);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  }
  .main-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  .main-nav ul { flex-direction: column; gap: 14px; }
  .nav-cta { align-self: flex-start; }

  .section { padding: 64px 0; }
  .mission-grid { grid-template-columns: 1fr; }
  .pillars-grid { grid-template-columns: 1fr; }
}