:root {
  --color-bg: #f5f6f7;
  --color-bg-elevated: #ffffff;
  --color-surface: #eceef0;
  --color-text: #2a2e33;
  --color-text-muted: #5c6570;
  --color-border: #d8dce0;
  --color-accent: #4a5560;
  --color-accent-soft: #6b7885;
  --color-accent-hover: #363e46;
  --color-focus: #3d6b7a;
  --font-display: "Bai Jamjuree", "Sarabun", sans-serif;
  --font-body: "Sarabun", "Noto Sans Thai", sans-serif;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.75rem;
  --space-lg: 3rem;
  --space-xl: 5rem;
  --radius: 4px;
  --shadow-soft: 0 12px 40px rgba(42, 46, 51, 0.06);
  --max: 1120px;
  --header-h: 4.25rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  background-image:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(74, 85, 96, 0.07), transparent 55%),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(61, 107, 122, 0.05), transparent 50%);
  min-height: 100vh;
}

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

a {
  color: var(--color-focus);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  transition: color 0.25s var(--ease);
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

h1 { font-size: clamp(2rem, 4vw, 3rem); margin: 0 0 var(--space-sm); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin: 0 0 var(--space-sm); }
h3 { font-size: 1.25rem; margin: 0 0 var(--space-xs); }

p { margin: 0 0 var(--space-sm); color: var(--color-text-muted); }

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(245, 246, 247, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

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

.brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

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

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

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 1.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
  align-items: center;
}

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

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

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-sm);
    display: none;
  }
  .site-nav.is-open { display: block; }
  .site-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.75rem 1.35rem;
  font-family: var(--font-body);
  font-size: 1rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

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

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

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

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

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

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: var(--space-md);
}

/* Sections */
.section {
  padding: var(--space-xl) 0;
}

.section-tight {
  padding: var(--space-lg) 0;
}

.section-label {
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-soft);
  margin-bottom: var(--space-xs);
  font-family: var(--font-display);
}

.lead {
  font-size: 1.15rem;
  max-width: 38rem;
}

/* Hero — full-bleed visual plane */
.hero {
  position: relative;
  min-height: min(88vh, 720px);
  display: flex;
  align-items: flex-end;
  color: #fff;
  overflow: hidden;
}

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

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  animation: heroDrift 28s var(--ease) infinite alternate;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(24, 28, 32, 0.25) 0%,
    rgba(24, 28, 32, 0.55) 45%,
    rgba(24, 28, 32, 0.88) 100%
  );
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: var(--space-xl) 0 calc(var(--space-xl) + 0.5rem);
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
  animation: fadeUp 0.9s var(--ease) both;
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 600;
  margin: 0 0 var(--space-sm);
  letter-spacing: -0.02em;
}

.hero h1 {
  color: #fff;
  max-width: 18ch;
  font-size: clamp(1.35rem, 2.8vw, 1.85rem);
  font-weight: 500;
}

.hero .lead {
  color: rgba(255, 255, 255, 0.88);
  max-width: 36rem;
}

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

.hero .btn-primary:hover {
  background: var(--color-surface);
  color: var(--color-text);
}

.hero .btn-ghost {
  border-color: rgba(255, 255, 255, 0.45);
  color: #fff;
}

.hero .btn-ghost:hover {
  border-color: #fff;
  color: #fff;
}

@keyframes heroDrift {
  from { transform: scale(1.02); }
  to { transform: scale(1.08) translate(-1%, -0.5%); }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes reveal {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  animation: reveal 0.8s var(--ease) both;
}

.page-hero {
  padding: var(--space-xl) 0 var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  background:
    linear-gradient(135deg, var(--color-surface) 0%, var(--color-bg) 55%, rgba(61, 107, 122, 0.06) 100%);
}

.page-hero .lead { margin-bottom: 0; }

/* Offer / service rows */
.offer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.offer-item {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow 0.35s var(--ease), transform 0.35s var(--ease);
}

.offer-item:hover {
  box-shadow: var(--shadow-soft);
  transform: translateY(-3px);
}

.offer-item img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.offer-body {
  padding: var(--space-md);
}

.offer-meta {
  font-size: 0.9rem;
  color: var(--color-accent-soft);
  margin-bottom: var(--space-xs);
}

.flagship-block {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-lg);
  align-items: center;
  margin-top: var(--space-md);
}

.flagship-block img {
  width: 100%;
  height: min(420px, 55vw);
  object-fit: cover;
  border-radius: var(--radius);
}

@media (max-width: 800px) {
  .flagship-block { grid-template-columns: 1fr; }
}

.checklist {
  list-style: none;
  padding: 0;
  margin: var(--space-sm) 0;
}

.checklist li {
  position: relative;
  padding-left: 1.35rem;
  margin-bottom: 0.55rem;
  color: var(--color-text-muted);
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.45rem;
  height: 0.45rem;
  background: var(--color-accent-soft);
  border-radius: 1px;
}

.split-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

@media (max-width: 700px) {
  .split-list { grid-template-columns: 1fr; }
}

/* Quotes */
.quote-list {
  display: grid;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.quote {
  padding: var(--space-md);
  background: var(--color-bg-elevated);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
}

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

.quote footer {
  margin-top: var(--space-sm);
  font-size: 0.92rem;
  color: var(--color-text-muted);
}

/* Blog */
.post-list {
  display: grid;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.post-card {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: var(--space-md);
  align-items: center;
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.post-card img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: var(--radius);
}

.post-card a.title-link {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
}

.post-card a.title-link:hover { color: var(--color-focus); }

@media (max-width: 700px) {
  .post-card { grid-template-columns: 1fr; }
}

.prose {
  max-width: 42rem;
}

.prose p { margin-bottom: 1.15rem; }

.cover-wide {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  border-radius: var(--radius);
  margin: var(--space-md) 0 var(--space-lg);
}

/* Pricing */
.rate-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-md);
  background: var(--color-bg-elevated);
}

.rate-table th,
.rate-table td {
  text-align: left;
  padding: 1rem 1.1rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.rate-table th {
  font-family: var(--font-display);
  font-weight: 600;
  background: var(--color-surface);
}

.note-box {
  margin-top: var(--space-md);
  padding: var(--space-md);
  background: var(--color-surface);
  border-radius: var(--radius);
}

/* Forms */
.form {
  display: grid;
  gap: var(--space-sm);
  max-width: 36rem;
}

.form-row {
  display: grid;
  gap: 0.35rem;
}

.form-row label {
  font-weight: 600;
  font-size: 0.95rem;
}

.form-row input,
.form-row select,
.form-row textarea {
  font: inherit;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-elevated);
  color: var(--color-text);
  width: 100%;
}

.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  outline: 2px solid var(--color-focus);
  outline-offset: 1px;
}

.field-error {
  color: #9b3b3b;
  font-size: 0.88rem;
  display: none;
}

.form-row.has-error .field-error { display: block; }
.form-row.has-error input,
.form-row.has-error select,
.form-row.has-error textarea {
  border-color: #9b3b3b;
}

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

.form-status.is-success {
  display: block;
  background: #e6efe8;
  color: #245536;
}

.form-status.is-error {
  display: block;
  background: #f5e6e6;
  color: #7a2e2e;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-lg);
}

@media (max-width: 800px) {
  .contact-grid { grid-template-columns: 1fr; }
}

.contact-aside {
  padding: var(--space-md);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  height: fit-content;
}

.contact-aside dt {
  font-weight: 600;
  margin-top: 0.85rem;
}

.contact-aside dd {
  margin: 0.25rem 0 0;
  color: var(--color-text-muted);
}

/* Legal */
.legal h2 {
  margin-top: var(--space-lg);
}

.legal table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-sm) 0 var(--space-md);
  font-size: 0.95rem;
}

.legal th,
.legal td {
  border: 1px solid var(--color-border);
  padding: 0.65rem 0.75rem;
  text-align: left;
  vertical-align: top;
}

.legal th { background: var(--color-surface); }

/* Curriculum timeline */
.timeline {
  margin-top: var(--space-md);
  display: grid;
  gap: 0;
}

.timeline-item {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
  opacity: 0;
  animation: reveal 0.7s var(--ease) forwards;
}

.timeline-item:nth-child(1) { animation-delay: 0.05s; }
.timeline-item:nth-child(2) { animation-delay: 0.15s; }
.timeline-item:nth-child(3) { animation-delay: 0.25s; }
.timeline-item:nth-child(4) { animation-delay: 0.35s; }
.timeline-item:nth-child(5) { animation-delay: 0.45s; }
.timeline-item:nth-child(6) { animation-delay: 0.55s; }

.timeline-mod {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-accent);
}

/* Footer */
.site-footer {
  margin-top: var(--space-xl);
  padding: var(--space-lg) 0;
  background: var(--color-accent);
  color: rgba(255, 255, 255, 0.88);
}

.site-footer a {
  color: #fff;
  text-decoration: none;
}

.site-footer a:hover { text-decoration: underline; }

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-md);
}

.footer-grid h3 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: var(--space-sm);
}

.footer-grid ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-grid li { margin-bottom: 0.4rem; }

.footer-meta {
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  font-size: 0.9rem;
}

@media (max-width: 800px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* Cookie banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 -8px 30px rgba(42, 46, 51, 0.08);
  padding: var(--space-md);
  display: none;
}

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

.cookie-inner {
  width: min(100%, var(--max));
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.cookie-inner p {
  margin: 0;
  flex: 1 1 280px;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

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

/* 404 */
.error-page {
  min-height: 60vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: var(--space-xl) var(--space-sm);
}

.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
}

.steps li {
  counter-increment: step;
  position: relative;
  padding: 0 0 var(--space-md) 2.5rem;
  color: var(--color-text-muted);
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-accent);
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.85rem;
}

.muted { color: var(--color-text-muted); }

.inline-error {
  color: #9b3b3b;
  font-size: 0.9rem;
  margin-top: 0.5rem;
}