/* ══════════════════════════════════════════
   KCK678 — Design System
   Theme: Dark Carbon + Burnt Orange
   ══════════════════════════════════════════ */

:root {
  /* Core Palette */
  --color-primary: #0F0E13;
  --color-secondary: #EA580C;
  --color-accent: #FB923C;
  --color-bg: #0A090E;
  --color-surface: rgba(234, 88, 12, 0.08);
  --color-text: #FFFFFF;

  /* Extended Tokens */
  --bg-footer: #08070B;
  --bg-card-solid: #1A150E;
  --bg-card-dark: #120F0A;
  --bg-heading-block: rgba(234, 88, 12, 0.12);
  --bg-ticker: #151008;
  --text-heading: #FDDCB5;
  --text-heading-alt: #FDE68A;
  --text-nav-hover: #FB923C;
  --text-link: #F97316;
  --text-keyword: #FB923C;
  --text-footer-brand: #F97316;
  --border-header: rgba(234, 88, 12, 0.3);
  --border-section: rgba(234, 88, 12, 0.4);
  --border-footer: #EA580C;
  --border-faq: rgba(234, 88, 12, 0.15);
  --border-divider: rgba(251, 146, 60, 0.2);

  /* Gradients */
  --gradient-btn-primary: linear-gradient(180deg, #EA580C 0%, #C2410C 100%);
  --gradient-btn-secondary: linear-gradient(180deg, #F97316 0%, #EA580C 100%);
  --gradient-btn-mobile: linear-gradient(180deg, #EA580C 0%, #C2410C 100%);
  --gradient-provider: linear-gradient(135deg, #1A150E 0%, #201508 100%);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 60px;
  --space-3xl: 80px;
}

/* ═══ Reset & Base ═══ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Kanit', sans-serif;
  font-size: 17px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image: radial-gradient(ellipse at 50% 0%, rgba(234,88,12,0.06) 0%, transparent 60%);
  background-attachment: fixed;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body:not(.js-ready) main { opacity: 0; }
body.js-ready main { animation: fadeIn 0.3s ease-out forwards; }

a { color: var(--text-link); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--color-accent); }

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

h1, h2, h3 { font-weight: 600; color: var(--text-heading); line-height: 1.3; }
h1 { font-size: 32px; line-height: 1.2; }
h2 { font-size: 25px; margin-bottom: var(--space-md); }
h3 { font-size: 20px; color: var(--text-heading-alt); margin-bottom: var(--space-sm); }

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

.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--space-md); }

/* ═══ Animations ═══ */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.5s ease-out, transform 0.5s ease-out; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ═══ Header ═══ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-primary);
  border-bottom: 1px solid var(--border-header);
  height: 72px;
  display: flex;
  align-items: center;
  backdrop-filter: blur(10px);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo { display: flex; align-items: center; text-decoration: none; flex-shrink: 0; }
.logo img { height: 56px; width: auto; }
.logo-text { font-family: 'Kanit', sans-serif; font-weight: 700; font-size: 1.5rem; color: var(--color-accent); }

.main-nav { display: flex; gap: var(--space-lg); align-items: center; }
.main-nav a {
  color: var(--color-text);
  font-size: 16px;
  font-weight: 700;
  padding: var(--space-sm) var(--space-md);
  border-radius: 8px;
  transition: color 0.2s ease, background 0.2s ease;
}
.main-nav a:hover, .main-nav a.active { color: var(--text-nav-hover); background: rgba(234,88,12,0.1); }

.cta-header-nav {
  background: var(--gradient-btn-primary);
  color: #fff !important;
  padding: 12px 28px;
  border-radius: 25px;
  font-weight: 500;
  font-size: 16px;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease;
  text-shadow: 0 0 10px rgba(0,0,0,0.3);
  text-decoration: none;
  display: inline-block;
}
.cta-header-nav:hover { transform: scale(0.96); color: #fff; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}
.hamburger span {
  width: 28px;
  height: 3px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(6px, 6px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(6px, -6px); }

/* ═══ Hero ═══ */
.hero {
  padding: var(--space-2xl) 0;
  text-align: center;
}
.hero-image {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto var(--space-lg);
  border-radius: 10px;
  overflow: hidden;
}
.hero-image img { width: 100%; height: auto; border-radius: 10px; }
.hero h1 { margin-bottom: var(--space-md); }
.hero p { max-width: 800px; margin: 0 auto var(--space-lg); font-size: 18px; }

/* ═══ CTA Buttons ═══ */
.cta-button, .cta-primary {
  background: var(--gradient-btn-primary);
  color: #fff;
  padding: 14px 32px;
  border-radius: 25px;
  font-weight: 500;
  font-size: 16px;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease;
  text-shadow: 0 0 10px rgba(0,0,0,0.3);
  text-decoration: none;
  display: inline-block;
}
.cta-button:hover, .cta-primary:hover { transform: scale(0.96); color: #fff; }

.cta-secondary {
  background: var(--gradient-btn-secondary);
  color: #fff;
  padding: 14px 32px;
  border-radius: 25px;
  border: 1px solid rgba(255,255,255,0.9);
  font-weight: 500;
  font-size: 16px;
  cursor: pointer;
  transition: transform 0.2s ease;
  text-decoration: none;
  display: inline-block;
}
.cta-secondary:hover { transform: scale(0.96); color: #fff; }

/* ═══ Ticker ═══ */
.ticker {
  background: var(--bg-ticker);
  border-radius: 20px;
  padding: var(--space-sm) var(--space-lg);
  margin: 0 auto var(--space-xl);
  max-width: 1200px;
  overflow: hidden;
  text-align: center;
  font-size: 15px;
  color: var(--color-accent);
}

/* ═══ TOC ═══ */
.toc-container {
  background: var(--bg-card-dark);
  border: 1px solid var(--border-section);
  border-radius: 10px;
  padding: var(--space-lg);
  margin: 0 auto var(--space-xl);
  max-width: 800px;
}
.toc-container h2 { font-size: 20px; margin-bottom: var(--space-md); text-align: center; }
.toc-container ol { padding-left: var(--space-lg); }
.toc-container li { margin-bottom: var(--space-sm); }
.toc-container a { color: var(--text-link); font-size: 16px; }
.toc-container a:hover { color: var(--color-accent); }

/* ═══ Content Sections ═══ */
.content-section {
  max-width: 1200px;
  margin: 0 auto var(--space-xl);
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 2px solid var(--border-section);
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.5);
}

.section-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: center;
}
.section-grid.reverse { direction: rtl; }
.section-grid.reverse > * { direction: ltr; }

.section-image { border-radius: 10px; overflow: hidden; }
.section-image img { width: 100%; border-radius: 10px; transition: filter 0.3s ease; }
.section-image img:hover { filter: brightness(1.32) contrast(1.21) saturate(1.16); }

/* ═══ H3 Block ═══ */
.h3-block {
  background: var(--bg-heading-block);
  border-radius: 10px;
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
}

/* ═══ Label Bar ═══ */
.label-bar {
  background: var(--gradient-provider);
  border: 1px solid var(--border-section);
  border-radius: 7px;
  padding: var(--space-sm) var(--space-md);
  margin-bottom: var(--space-md);
  font-weight: 600;
  color: var(--text-heading);
}

/* ═══ FAQ Section ═══ */
.faq-section {
  background: var(--bg-card-dark);
  border-radius: 20px;
  padding: var(--space-xl);
  max-width: 1200px;
  margin: 0 auto var(--space-xl);
}
.faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg); }
.faq-card {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-faq);
  border-radius: 20px;
  padding: 35px;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.faq-card:hover { transform: translate3d(0, -8px, 0) scale(1.02); }
.faq-card strong { color: var(--text-heading); display: block; margin-bottom: var(--space-sm); }

/* ═══ Login Form ═══ */
.login-form-container {
  max-width: 460px;
  margin: 0 auto var(--space-xl);
  padding: var(--space-xl);
  background: var(--bg-card-dark);
  border: 2px solid var(--border-section);
  border-radius: 20px;
}
.login-form h3 { text-align: center; margin-bottom: var(--space-lg); color: var(--text-heading); }
.login-form label { display: block; margin-bottom: var(--space-xs); font-size: 15px; }
.login-form input[type="text"],
.login-form input[type="password"] {
  width: 100%;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 8px;
  height: 48px;
  padding: 0 var(--space-md);
  color: var(--color-text);
  font-family: 'Kanit', sans-serif;
  font-size: 16px;
  margin-bottom: var(--space-md);
  transition: border-color 0.2s ease;
}
.login-form input:focus { border-color: var(--color-accent); outline: none; }
.login-form .cta-button { width: 100%; text-align: center; margin-bottom: var(--space-md); }
.form-links { display: flex; justify-content: space-between; font-size: 14px; }

/* ═══ Promotion Cards ═══ */
.promo-card {
  background: var(--color-surface);
  border: 2px solid var(--border-section);
  border-radius: 10px;
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  box-shadow: 0 0 10px rgba(0,0,0,0.5);
}
.promo-card img { border-radius: 10px; margin-bottom: var(--space-md); max-width: 600px; }
.promo-card h2 { margin-bottom: var(--space-md); }

/* ═══ Blog Post ═══ */
.blog-content {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-lg);
}
.blog-content .featured-image { margin-bottom: var(--space-lg); border-radius: 10px; overflow: hidden; }
.blog-content .featured-image img { width: 100%; border-radius: 10px; }
.blog-meta { font-size: 14px; color: rgba(255,255,255,0.6); margin-bottom: var(--space-lg); }

/* ═══ Archive / Post Grid ═══ */
.post-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg); margin-top: var(--space-lg); }
.post-card {
  background: var(--bg-card-solid);
  border: 1px solid var(--border-section);
  border-radius: 10px;
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.post-card:hover { transform: translateY(-5px); }
.post-card-image img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.post-card-content { padding: var(--space-md); }
.post-card-content h2 { font-size: 18px; margin-bottom: var(--space-sm); }
.post-card-content h2 a { color: var(--text-heading); }
.post-card-content h2 a:hover { color: var(--color-accent); }
.post-card-meta { font-size: 13px; color: rgba(255,255,255,0.5); margin-bottom: var(--space-sm); }
.post-card-content p { font-size: 15px; color: rgba(255,255,255,0.8); margin-bottom: var(--space-md); }
.read-more { color: var(--text-link); font-weight: 500; font-size: 15px; }
.read-more:hover { color: var(--color-accent); }

/* ═══ Floating CTA ═══ */
.floating-cta {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 999;
  background: var(--gradient-btn-primary);
  color: #fff;
  padding: 14px 28px;
  border-radius: 25px;
  font-weight: 600;
  font-size: 16px;
  text-decoration: none;
  box-shadow: 0 4px 20px rgba(234,88,12,0.4);
  transition: transform 0.2s ease, opacity 0.3s ease;
}
.floating-cta:hover { transform: scale(0.96); color: #fff; }

/* ═══ Footer ═══ */
.site-footer {
  background: var(--bg-footer);
  border-top: 2px solid var(--border-footer);
  padding: var(--space-xl) 0 var(--space-lg);
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}
.footer-col h3 { color: var(--text-footer-brand); font-size: 18px; margin-bottom: var(--space-md); }
.footer-col a { display: block; color: rgba(255,255,255,0.7); margin-bottom: var(--space-sm); font-size: 15px; }
.footer-col a:hover { color: var(--color-accent); }
.footer-col p { color: rgba(255,255,255,0.6); font-size: 14px; line-height: 1.6; }
.footer-bottom {
  text-align: center;
  padding: var(--space-lg) var(--space-md) 0;
  margin-top: var(--space-lg);
  border-top: 1px solid var(--border-divider);
  color: rgba(255,255,255,0.4);
  font-size: 13px;
}
.footer-cta { margin-top: var(--space-md); }

/* ═══ Keyword Highlight ═══ */
.keyword { color: var(--text-keyword); }

/* ═══ Steps List ═══ */
.steps-list { list-style: none; counter-reset: step; padding-left: 0; }
.steps-list li { counter-increment: step; padding-left: 40px; position: relative; margin-bottom: var(--space-md); }
.steps-list li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  width: 28px;
  height: 28px;
  background: var(--gradient-btn-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 14px;
  line-height: 28px;
  text-align: center;
}

/* ═══ UL/OL ═══ */
.content-section ul, .content-section ol,
.blog-content ul, .blog-content ol {
  padding-left: var(--space-lg);
  margin-bottom: var(--space-md);
}
.content-section li, .blog-content li { margin-bottom: var(--space-sm); }

/* ═══ Responsive — Tablet ═══ */
@media (max-width: 1023px) {
  h1 { font-size: 25px; }
  h2 { font-size: 21px; }
  h3 { font-size: 19px; }
  body { font-size: 16px; }

  .cta-header-nav { display: none; }

  .hamburger { display: flex; }
  .main-nav {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-primary);
    flex-direction: column;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border-header);
    gap: var(--space-sm);
  }
  .main-nav.active { display: flex; }

  .section-grid { grid-template-columns: 1fr; }
  .section-grid.reverse { direction: ltr; }
  .faq-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .post-grid { grid-template-columns: 1fr; }

  .hero { padding: var(--space-xl) 0; }
  .content-section { margin-bottom: var(--space-lg); padding: var(--space-md); }
}

/* ═══ Responsive — Mobile ═══ */
@media (max-width: 767px) {
  h1 { font-size: 20px; }
  h2 { font-size: 19px; }
  h3 { font-size: 17px; }
  body { font-size: 15px; }

  .container { padding: 0 var(--space-sm); }
  .hero { padding: var(--space-lg) 0; }
  .hero p { font-size: 16px; }
  .content-section { padding: var(--space-md); margin-bottom: var(--space-md); }

  .cta-button, .cta-primary, .cta-secondary { width: 100%; text-align: center; padding: 14px 20px; min-height: 48px; }

  .footer-inner { grid-template-columns: 1fr; gap: var(--space-lg); }
  .floating-cta { bottom: 12px; right: 12px; left: 12px; text-align: center; }
  .faq-card { padding: var(--space-lg); }

  .toc-container { padding: var(--space-md); }
  .promo-card img { max-width: 100%; }
}