:root {
  --bg: #f6f7f8;
  --bg-soft: #eef1f3;
  --surface: #ffffff;
  --ink: #1a1d23;
  --ink-soft: #4a5160;
  --muted: #6e7685;
  --line: #dce1e6;
  --accent: #3d6b5e;
  --accent-deep: #2c4f45;
  --accent-soft: #d8e6e0;
  --warm: #5c7a9a;
  --warm-soft: #e8eef4;
  --danger: #9b3d3d;
  --ok: #2f6b4f;
  --shadow: 0 18px 50px rgba(26, 29, 35, 0.08);
  --radius: 14px;
  --radius-sm: 8px;
  --max: 1120px;
  --header-h: 72px;
  --font-display: "Prompt", "Sarabun", sans-serif;
  --font-body: "Sarabun", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(61, 107, 94, 0.08), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(92, 122, 154, 0.1), transparent 50%),
    var(--bg);
  min-height: 100vh;
}

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

a {
  color: var(--accent-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0 0 0.6em;
}

h1 { font-size: clamp(2.4rem, 5vw, 4.2rem); }
h2 { font-size: clamp(1.8rem, 3vw, 2.6rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.55rem); }

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.container {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(246, 247, 248, 0.86);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(255, 255, 255, 0.92);
}

.header-inner {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--ink);
}

.logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background:
    linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 55%, #6a8f82 120%);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.2);
}

.logo-text {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.15rem;
}

.site-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
}

.nav-cta {
  padding: 0.55rem 1rem;
  border-radius: 999px;
  background: var(--ink);
  color: #fff !important;
  transition: transform 0.25s var(--ease), background 0.25s ease;
}

.nav-cta:hover {
  background: var(--accent-deep);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
  position: relative;
}

.nav-toggle-bar,
.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  height: 2px;
  background: var(--ink);
  transition: transform 0.25s var(--ease), opacity 0.2s ease;
}

.nav-toggle-bar { top: 21px; }
.nav-toggle-bar::before { top: -7px; }
.nav-toggle-bar::after { top: 7px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bar {
  background: transparent;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar::before {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar::after {
  transform: translateY(-7px) rotate(-45deg);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.35rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit;
  font-size: 1rem;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.25s var(--ease), background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--ink);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-deep);
  color: #fff;
}

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

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent-deep);
}

.btn-soft {
  background: var(--accent-soft);
  color: var(--accent-deep);
}

.hero {
  position: relative;
  min-height: min(88vh, 820px);
  display: grid;
  align-items: end;
  overflow: hidden;
  color: #fff;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.04);
  animation: heroDrift 18s var(--ease) infinite alternate;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(26, 29, 35, 0.28) 0%, rgba(26, 29, 35, 0.72) 70%, rgba(26, 29, 35, 0.88) 100%),
    linear-gradient(90deg, rgba(26, 29, 35, 0.55), transparent 60%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(100% - 2.5rem, var(--max));
  margin: 0 auto;
  padding: 7rem 0 4.5rem;
}

.brand-signal {
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 6.5rem);
  line-height: 0.92;
  margin: 0 0 1.1rem;
  letter-spacing: -0.04em;
  animation: riseIn 0.9s var(--ease) both;
}

.hero-lead {
  max-width: 34rem;
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.88);
  animation: riseIn 1s var(--ease) 0.12s both;
}

.hero-actions {
  margin-top: 1.75rem;
  animation: riseIn 1s var(--ease) 0.22s both;
}

.section {
  padding: 5rem 0;
}

.section-tight {
  padding: 3.5rem 0;
}

.section-head {
  max-width: 38rem;
  margin-bottom: 2.5rem;
}

.section-head p {
  margin-bottom: 0;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 0.75rem;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}

.proof-strip {
  border-block: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.55);
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  text-align: center;
}

.proof-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: var(--ink);
  font-weight: 600;
}

.proof-item span {
  color: var(--muted);
  font-size: 0.95rem;
}

.featured-course {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.5rem;
  align-items: center;
}

.featured-course img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow);
}

.benefit-list {
  display: grid;
  gap: 1.25rem;
}

.benefit-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
}

.benefit-item:first-child {
  border-top: 1px solid var(--line);
}

.benefit-num {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--warm);
  min-width: 2rem;
}

.course-grid,
.blog-grid,
.pricing-grid,
.review-grid {
  display: grid;
  gap: 1.5rem;
}

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

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

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

.media-tile {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.media-tile:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.media-tile img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.media-tile .tile-body {
  padding: 1.25rem 1.35rem 1.5rem;
}

.media-tile h3 {
  margin-bottom: 0.45rem;
}

.media-tile h3 a {
  text-decoration: none;
  color: inherit;
}

.media-tile p {
  margin: 0;
  font-size: 0.98rem;
}

.tile-meta {
  margin-top: 1rem;
  font-size: 0.88rem;
  color: var(--muted);
}

.quote-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem 1.6rem;
}

.quote-panel p {
  font-size: 1.05rem;
  color: var(--ink-soft);
}

.quote-panel footer {
  margin-top: 1.1rem;
  font-size: 0.92rem;
  color: var(--muted);
}

.quote-panel .stars {
  color: var(--warm);
  letter-spacing: 0.08em;
  margin-bottom: 0.6rem;
}

.price-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.price-card.featured {
  border-color: var(--accent);
  background:
    linear-gradient(180deg, rgba(216, 230, 224, 0.55), #fff 40%);
  transform: translateY(-8px);
}

.price-card .amount {
  font-family: var(--font-display);
  font-size: 2.6rem;
  color: var(--ink);
  line-height: 1;
}

.price-card .amount span {
  font-size: 1rem;
  color: var(--muted);
  font-family: var(--font-body);
}

.price-card ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.65rem;
  flex: 1;
}

.price-card li {
  padding-left: 1.2rem;
  position: relative;
  color: var(--ink-soft);
}

.price-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--accent);
}

.page-hero {
  padding: 4.5rem 0 2.5rem;
}

.page-hero h1 {
  max-width: 16ch;
}

.page-hero p {
  max-width: 40rem;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: start;
}

.split img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.prose {
  max-width: 68ch;
}

.prose h2 {
  margin-top: 2rem;
}

.prose ul,
.prose ol {
  color: var(--ink-soft);
  padding-left: 1.2rem;
}

.prose li {
  margin-bottom: 0.45rem;
}

.module-list {
  display: grid;
  gap: 0.85rem;
}

.module-item {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 1rem;
  padding: 1.1rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.module-item strong {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--accent);
}

.faq details {
  border-bottom: 1px solid var(--line);
  padding: 1rem 0;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--ink);
}

.faq p {
  margin: 0.75rem 0 0.25rem;
}

.form {
  display: grid;
  gap: 1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.form label {
  display: grid;
  gap: 0.4rem;
  font-weight: 600;
  color: var(--ink);
}

.form input,
.form select,
.form textarea {
  font: inherit;
  padding: 0.8rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--ink);
}

.form textarea {
  min-height: 140px;
  resize: vertical;
}

.form input:focus,
.form select:focus,
.form textarea:focus {
  outline: 2px solid var(--accent-soft);
  border-color: var(--accent);
}

.field-error {
  color: var(--danger);
  font-size: 0.9rem;
  font-weight: 400;
  min-height: 1.2em;
}

.form-status {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  display: none;
}

.form-status.is-success {
  display: block;
  background: #e7f3ec;
  color: var(--ok);
}

.form-status.is-error {
  display: block;
  background: #f8e8e8;
  color: var(--danger);
}

.contact-aside {
  background: var(--bg-soft);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.contact-aside h2 {
  font-size: 1.4rem;
}

.contact-aside p {
  margin-bottom: 0.85rem;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

th, td {
  text-align: left;
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  background: var(--bg-soft);
  color: var(--ink);
}

tr:last-child td {
  border-bottom: 0;
}

.site-footer {
  margin-top: 4rem;
  background: #171a1f;
  color: rgba(255, 255, 255, 0.78);
  padding: 3.5rem 0 2rem;
}

.site-footer a {
  color: rgba(255, 255, 255, 0.78);
  text-decoration: none;
}

.site-footer a:hover {
  color: #fff;
}

.site-footer .logo-text {
  color: #fff;
}

.site-footer .footer-tagline {
  color: rgba(255, 255, 255, 0.65);
  max-width: 28rem;
}

.footer-inner {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

.footer-cols {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr) 1.4fr;
  gap: 1.5rem;
  margin-top: 2rem;
}

.footer-col {
  display: grid;
  gap: 0.55rem;
  align-content: start;
}

.footer-col h2 {
  font-size: 1rem;
  color: #fff;
  margin-bottom: 0.4rem;
  font-family: var(--font-body);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 600;
}

.footer-contact p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.92rem;
}

.footer-bottom {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.9rem;
}

.cookie-banner {
  position: fixed;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  z-index: 60;
  max-width: 720px;
  margin-inline: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.15rem 1.25rem;
  display: none;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  animation: riseIn 0.45s var(--ease);
}

.cookie-banner.is-visible {
  display: flex;
}

.cookie-banner p {
  margin: 0;
  font-size: 0.95rem;
}

.cookie-actions {
  display: flex;
  gap: 0.6rem;
  flex-shrink: 0;
}

.inline-error {
  margin: 1rem auto;
  width: min(100% - 2.5rem, var(--max));
  padding: 0.85rem 1rem;
  background: #f8e8e8;
  color: var(--danger);
  border-radius: var(--radius-sm);
}

.cta-band {
  background:
    linear-gradient(120deg, rgba(61, 107, 94, 0.12), rgba(92, 122, 154, 0.14)),
    var(--surface);
  border-block: 1px solid var(--line);
}

.cta-band .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.case-study {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.75rem;
  margin-bottom: 1.5rem;
}

.instructor {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 1.25rem;
  align-items: center;
  background: var(--bg-soft);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.instructor img {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

.error-page {
  min-height: 70vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 4rem 1.25rem;
}

.error-page .code {
  font-family: var(--font-display);
  font-size: clamp(5rem, 18vw, 9rem);
  line-height: 0.9;
  color: var(--accent);
  margin: 0;
}

@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes heroDrift {
  from { transform: scale(1.04) translate3d(0, 0, 0); }
  to { transform: scale(1.1) translate3d(-1.5%, -1%, 0); }
}

@media (max-width: 960px) {
  .proof-grid,
  .course-grid,
  .blog-grid,
  .pricing-grid,
  .footer-cols {
    grid-template-columns: 1fr 1fr;
  }

  .featured-course,
  .split,
  .review-grid {
    grid-template-columns: 1fr;
  }

  .price-card.featured {
    transform: none;
  }

  .footer-cols {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 780px) {
  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem 1.25rem 1.25rem;
    gap: 0.35rem;
    display: none;
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 0.7rem 0.4rem;
  }

  .nav-cta {
    text-align: center;
    margin-top: 0.4rem;
  }

  .proof-grid,
  .course-grid,
  .blog-grid,
  .pricing-grid,
  .footer-cols {
    grid-template-columns: 1fr;
  }

  .cookie-banner {
    flex-direction: column;
    align-items: stretch;
  }

  .cookie-actions {
    width: 100%;
  }

  .cookie-actions .btn {
    flex: 1;
  }

  .instructor {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  .hero-content {
    padding-top: 6rem;
  }
}