/* ---------- Design tokens ---------- */
:root {
  --color-bg: #faf8f4;
  --color-surface: #ffffff;
  --color-surface-alt: #fff4e9;
  --color-text: #241d15;
  --color-text-muted: #5c5346;
  --color-border: #e8ddcd;
  --color-primary: #1e3a8a;
  --color-primary-dark: #142a63;
  --color-primary-contrast: #ffffff;
  --color-accent: #1f7a5c;
  --shadow-sm: 0 1px 2px rgba(36, 29, 21, 0.06);
  --shadow-md: 0 8px 24px rgba(36, 29, 21, 0.08);
  --radius-md: 14px;
  --radius-lg: 22px;
  --font-body: "Noto Sans Thai", system-ui, -apple-system, sans-serif;
  --max-width: 1120px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #17140f;
    --color-surface: #211c15;
    --color-surface-alt: #2a2117;
    --color-text: #f5efe4;
    --color-text-muted: #c9bea9;
    --color-border: #3a3225;
    --color-primary: #5b8def;
    --color-primary-dark: #7fb0f5;
    --color-primary-contrast: #17140f;
    --color-accent: #4bbb92;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

:root[data-theme="dark"] {
  --color-bg: #17140f;
  --color-surface: #211c15;
  --color-surface-alt: #2a2117;
  --color-text: #f5efe4;
  --color-text-muted: #c9bea9;
  --color-border: #3a3225;
  --color-primary: #5b8def;
  --color-primary-dark: #7fb0f5;
  --color-primary-contrast: #17140f;
  --color-accent: #4bbb92;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { line-height: 1.3; margin: 0 0 0.5em; font-weight: 700; }
p { margin: 0 0 1em; color: var(--color-text-muted); }
ul, ol { padding: 0; margin: 0; list-style: none; }
a { color: inherit; }
img { max-width: 100%; display: block; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  padding: 0.75rem 1.25rem;
  border-radius: 0 0 8px 0;
  z-index: 100;
}
.skip-link:focus { left: 0; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
  font-family: inherit;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--color-primary);
  color: var(--color-primary-contrast);
}
.btn-primary:hover { background: var(--color-primary-dark); }
.btn-ghost {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}
.btn-ghost:hover { border-color: var(--color-primary); }
.btn-lg { padding: 0.9rem 1.75rem; font-size: 1.05rem; }
.btn-sm { padding: 0.55rem 1.1rem; font-size: 0.9rem; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.9rem;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  font-size: 1.1rem;
  text-decoration: none;
}
.logo-mark { font-size: 1.3rem; }
img.logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  object-fit: cover;
  flex-shrink: 0;
}
.site-footer img.logo-mark { width: 28px; height: 28px; border-radius: 7px; }
.header-right { display: flex; align-items: center; gap: 1.5rem; }
.site-nav ul { display: flex; gap: 1.75rem; }
.site-nav a { text-decoration: none; font-weight: 500; color: var(--color-text-muted); }
.site-nav a:hover { color: var(--color-primary); }
.header-cta { flex-shrink: 0; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  cursor: pointer;
  flex-shrink: 0;
}
.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 780px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: 0;
    overflow: hidden;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    transition: max-height 0.25s ease;
  }
  .site-nav.is-open { max-height: 320px; }
  .site-nav ul { flex-direction: column; gap: 0; padding: 0.5rem 0; }
  .site-nav li { border-top: 1px solid var(--color-border); }
  .site-nav li:first-child { border-top: none; }
  .site-nav a { display: block; padding: 0.85rem 1.5rem; }
}

/* ---------- Hero ---------- */
.hero {
  padding-block: 4.5rem 4rem;
  background: radial-gradient(circle at top right, var(--color-surface-alt), var(--color-bg) 60%);
}
.hero-inner { max-width: 820px; }
.eyebrow {
  display: inline-block;
  color: var(--color-accent);
  font-weight: 700;
  letter-spacing: 0.03em;
  margin-bottom: 1rem;
}
.hero h1 {
  font-size: clamp(2rem, 4.2vw, 3.1rem);
  letter-spacing: -0.01em;
}
.accent { color: var(--color-primary); display: inline; }
.hero-lead {
  font-size: 1.15rem;
  max-width: 640px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 1.75rem 0;
}
.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  font-weight: 600;
  color: var(--color-text-muted);
}
.hero-badges li { display: inline-flex; align-items: center; gap: 0.4em; }

/* ---------- Sections ---------- */
section { padding-block: 4rem; }
section h2 {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
}
.section-lead {
  max-width: 620px;
  font-size: 1.05rem;
  margin-top: -0.25rem;
}

.grid { display: grid; gap: 1.5rem; margin-top: 2rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .grid-2, .grid-4 { grid-template-columns: 1fr; }
}

/* Pain points */
.pain-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem 1.5rem;
  box-shadow: var(--shadow-sm);
}
.pain-icon { font-size: 1.75rem; display: block; margin-bottom: 0.75rem; }
.pain-card h3 { font-size: 1.05rem; }
.pain-card p { margin: 0; font-size: 0.95rem; }

/* Explain */
.explain { background: var(--color-surface-alt); }
.explain-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}
.explain-card h3 { font-size: 1.2rem; }
.explain-card p { margin: 0; }

/* Course modules */
.module-list { margin-top: 2rem; display: grid; gap: 1rem; }
.module-card {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}
.module-number {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
  flex-shrink: 0;
  min-width: 2.5ch;
}
.module-card h3 { font-size: 1.1rem; margin-bottom: 0.35em; }
.module-card p { margin: 0; font-size: 0.95rem; }

/* Audience */
.audience-list li {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  font-weight: 600;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  align-items: center;
}
.audience-list li span { font-size: 1.8rem; }

/* Agenda / timeline */
.timeline {
  margin-top: 2rem;
  border-left: 2px solid var(--color-border);
  padding-left: 1.75rem;
  display: grid;
  gap: 1.75rem;
}
.timeline li { position: relative; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -2.3rem;
  top: 0.3rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
}
.timeline time {
  display: block;
  font-weight: 700;
  color: var(--color-primary);
  font-size: 0.9rem;
  margin-bottom: 0.2rem;
}
.timeline h3 { font-size: 1.05rem; margin: 0; }

/* Speaker */
.speaker-inner {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}
.speaker-avatar {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  background: var(--color-surface-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  flex-shrink: 0;
}
.speaker-name { font-size: 1.2rem; font-weight: 700; margin: 0 0 0.15em; color: var(--color-text); }
.speaker-role { color: var(--color-accent); font-weight: 600; margin-bottom: 0.75em; }
.speaker-note { font-size: 0.85rem; font-style: italic; }
@media (max-width: 600px) {
  .speaker-inner { flex-direction: column; align-items: center; text-align: center; }
}

/* FAQ */
.faq-list { margin-top: 2rem; display: grid; gap: 0.75rem; }
.faq-list details {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.4rem;
}
.faq-list summary {
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "+";
  float: right;
  font-weight: 400;
  color: var(--color-primary);
}
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { margin: 0.75rem 0 0; }

/* Register */
.register {
  background: var(--color-surface-alt);
}
.register-inner {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3rem;
  align-items: start;
}
@media (max-width: 780px) {
  .register-inner { grid-template-columns: 1fr; }
}
.register-form {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  display: grid;
  gap: 1.1rem;
}
.form-row { display: grid; gap: 0.4rem; }
.form-row label { font-weight: 600; font-size: 0.92rem; }
.form-row input,
.form-row select {
  font-family: inherit;
  font-size: 1rem;
  padding: 0.7rem 0.9rem;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
}
.form-row input:focus,
.form-row select:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}
.form-row input:invalid[data-touched="true"] {
  border-color: #c9432f;
}
.form-submit { margin-top: 0.5rem; }
.form-status { min-height: 1.2em; font-weight: 600; margin: 0; }
.form-status[data-state="success"] { color: var(--color-accent); }
.form-status[data-state="error"] { color: #c9432f; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-top: 3rem;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
  padding-bottom: 2rem;
}
.footer-inner p { margin: 0 0 0.4em; }
address { font-style: normal; }
address a { text-decoration: none; }
address a:hover { color: var(--color-primary); }
.footer-copyright {
  text-align: center;
  font-size: 0.85rem;
  border-top: 1px solid var(--color-border);
  padding: 1.25rem 1.5rem;
  margin: 0;
}

.hide-mobile { display: inline; }
@media (max-width: 560px) {
  .hide-mobile { display: none; }
}