:root {
  --bg: #f7f8fa;
  --bg-elevated: #ffffff;
  --ink: #1a1f26;
  --ink-soft: #5a6573;
  --line: #dde3ea;
  --accent: #1f6b5c;
  --accent-deep: #154f44;
  --accent-soft: #e6f2ef;
  --sand: #e8ebe6;
  --shadow: 0 18px 40px rgba(26, 31, 38, 0.06);
  --radius: 12px;
  --font-display: "Prompt", sans-serif;
  --font-body: "Sarabun", sans-serif;
  --max: 1120px;
  --header-h: 72px;
}

*,
*::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 500px at 10% -10%, #e7f1ee 0%, transparent 55%),
    radial-gradient(900px 420px at 100% 0%, #eceff3 0%, 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);
  line-height: 1.25;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 0.6em;
}

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

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(12px);
  background: rgba(247, 248, 250, 0.88);
  border-bottom: 1px solid rgba(221, 227, 234, 0.8);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: 1rem;
}

.brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.03em;
}

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

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  border-radius: 8px;
  padding: 0.45rem 0.7rem;
  font-family: var(--font-body);
  cursor: pointer;
}

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

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

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.75rem 1.25rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 10px 24px rgba(31, 107, 92, 0.22);
}

.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);
}

.hero {
  position: relative;
  min-height: calc(100vh - var(--header-h));
  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;
  animation: slowZoom 18s ease-in-out infinite alternate;
}

.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(16, 24, 28, 0.35) 0%, rgba(16, 24, 28, 0.72) 70%, rgba(16, 24, 28, 0.88) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 4.5rem 0 3.5rem;
  max-width: 38rem;
  animation: riseIn 0.9s ease both;
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  margin: 0 0 0.35em;
  line-height: 1.05;
}

.hero-line {
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 0.35em;
  font-weight: 500;
}

.hero-support {
  color: rgba(255, 255, 255, 0.78);
  margin-bottom: 1.6rem;
  max-width: 32rem;
}

.section {
  padding: 4.5rem 0;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  max-width: 18ch;
}

.section-lead {
  max-width: 42rem;
  margin-bottom: 2rem;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.split {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
}

.feature-list {
  display: grid;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  padding-left: 1.1rem;
  border-left: 3px solid var(--accent-soft);
}

.feature-list h3 {
  font-size: 1.15rem;
  margin-bottom: 0.35rem;
}

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

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

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

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

.media-link {
  display: block;
  text-decoration: none;
  color: inherit;
  transition: transform 0.25s ease;
}

.media-link:hover {
  transform: translateY(-4px);
}

.media-link img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius);
  margin-bottom: 0.9rem;
}

.media-link h3 {
  font-size: 1.15rem;
  color: var(--ink);
  margin-bottom: 0.35rem;
}

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

.panel {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.price-panel {
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.price-panel .price {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--ink);
  margin: 0.4rem 0 1rem;
}

.price-panel ul {
  margin: 0 0 1.5rem;
  padding-left: 1.1rem;
  color: var(--ink-soft);
  flex: 1;
}

.price-panel.featured {
  border-color: var(--accent);
  background: linear-gradient(180deg, #ffffff 0%, var(--accent-soft) 140%);
}

.quote {
  margin: 0;
  font-size: 1.05rem;
  color: var(--ink);
}

.quote footer {
  margin-top: 1rem;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  text-align: center;
}

.stat strong {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  color: var(--ink);
}

.stat span {
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.band {
  background: linear-gradient(135deg, var(--accent-deep), var(--accent));
  color: #fff;
  border-radius: calc(var(--radius) + 4px);
  padding: 2.5rem;
}

.band p {
  color: rgba(255, 255, 255, 0.85);
}

.band .btn-primary {
  background: #fff;
  color: var(--accent-deep);
  box-shadow: none;
}

.page-hero {
  padding: 3.5rem 0 2rem;
}

.page-hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  max-width: 16ch;
}

.prose {
  max-width: 46rem;
}

.prose h2 {
  margin-top: 2rem;
  font-size: 1.4rem;
}

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

.table-wrap {
  overflow-x: auto;
  margin: 1.5rem 0;
}

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

th,
td {
  border: 1px solid var(--line);
  padding: 0.75rem 0.9rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--accent-soft);
  font-family: var(--font-display);
  font-weight: 600;
}

.form {
  display: grid;
  gap: 1rem;
  max-width: 36rem;
}

label {
  display: grid;
  gap: 0.35rem;
  font-family: var(--font-display);
  font-size: 0.92rem;
}

input,
select,
textarea {
  font: inherit;
  font-family: var(--font-body);
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid rgba(31, 107, 92, 0.25);
  border-color: var(--accent);
}

.field-error {
  color: #9b2c2c;
  font-size: 0.88rem;
  min-height: 1.2em;
}

.form-status {
  padding: 0.85rem 1rem;
  border-radius: 10px;
  display: none;
}

.form-status.success {
  display: block;
  background: var(--accent-soft);
  color: var(--accent-deep);
}

.form-status.error {
  display: block;
  background: #fde8e8;
  color: #9b2c2c;
}

.inline-error {
  margin: 0.75rem 0;
  padding: 0.75rem 1rem;
  background: #fde8e8;
  color: #9b2c2c;
  border-radius: 10px;
  display: none;
}

.inline-error.visible {
  display: block;
}

.site-footer {
  margin-top: 3rem;
  border-top: 1px solid var(--line);
  background: #eef1f4;
  padding: 3rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 2rem;
}

.footer-grid h2 {
  font-size: 1rem;
  margin-bottom: 0.8rem;
}

.footer-grid p,
.footer-grid a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.95rem;
}

.footer-grid a:hover {
  color: var(--accent-deep);
}

.footer-links {
  display: grid;
  gap: 0.45rem;
}

.footer-bottom {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.cookie-banner {
  position: fixed;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  z-index: 60;
  max-width: 640px;
  margin-inline: auto;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.1rem 1.2rem;
  display: none;
  animation: riseIn 0.35s ease both;
}

.cookie-banner.visible {
  display: block;
}

.cookie-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.9rem;
}

.modules {
  display: grid;
  gap: 0.85rem;
}

.modules details {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.85rem 1rem;
}

.modules summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 500;
}

.faq details {
  border-bottom: 1px solid var(--line);
  padding: 0.9rem 0;
}

.faq summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 500;
}

.avatar {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  object-fit: cover;
}

.muted {
  color: var(--ink-soft);
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

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

@keyframes slowZoom {
  from {
    transform: scale(1);
  }
  to {
    transform: scale(1.06);
  }
}

@media (max-width: 900px) {
  .course-grid,
  .blog-grid,
  .price-grid,
  .review-grid,
  .split,
  .footer-grid,
  .stats {
    grid-template-columns: 1fr;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: rgba(247, 248, 250, 0.98);
    border-bottom: 1px solid var(--line);
    padding: 1rem;
    flex-direction: column;
    align-items: flex-start;
  }

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

  .hero {
    min-height: 78vh;
  }
}