:root {
  --color-white: #ffffff;
  --color-black: #101010;
  --color-ink-muted: #575757;
  --color-gold: #d7ae35;
  --color-gold-light: #f7e7a9;
  --color-yellow: #f4cf42;
  --color-border: #d7d7d7;
  --color-error: #b42318;
  --color-focus: #1459b8;
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --max-width: 70rem;
  --radius: 0.25rem;
  --shadow: 0 0.75rem 2rem rgb(16 16 16 / 12%);
  --font-sans: "Noto Sans Thai", "Leelawadee UI", Tahoma, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 5.5rem; }
body { margin: 0; padding-bottom: 5.5rem; color: var(--color-black); background: var(--color-white); font-family: var(--font-sans); font-size: 1rem; line-height: 1.6; }
img { display: block; max-width: 100%; }
a { color: inherit; }
button, input, textarea { font: inherit; }

:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 3px; }
.container { width: min(calc(100% - 2rem), var(--max-width)); margin-inline: auto; }
.section { padding-block: var(--space-6); }

.site-header { position: sticky; z-index: 10; top: 0; display: flex; align-items: center; justify-content: space-between; min-height: 4.25rem; padding-inline: max(1rem, calc((100% - var(--max-width)) / 2)); color: var(--color-white); background: var(--color-black); }
.brand, .brand-mark { font-weight: 900; letter-spacing: 0.08em; text-decoration: none; }
.header-link { font-size: 0.875rem; font-weight: 700; text-underline-offset: 0.25em; }

.hero { display: grid; min-height: min(41rem, calc(100svh - 4.25rem)); align-items: center; color: var(--color-white); background: var(--color-black); }
.hero__content { display: grid; gap: var(--space-4); align-items: center; padding-block: var(--space-5); }
.hero__copy { max-width: 43rem; }
.hero__image { width: min(100%, 14rem); margin: 0; justify-self: center; }
.hero__image img { width: 100%; aspect-ratio: 1 / 1; object-fit: contain; background: var(--color-white); }
.brand-mark { margin: 0 0 var(--space-4); color: var(--color-gold); font-size: clamp(1.1rem, 3vw, 1.45rem); }
h1, h2, p { margin-top: 0; }
h1, h2 { line-height: 1.2; }
h1 { max-width: 13ch; margin-bottom: var(--space-4); font-size: clamp(2.4rem, 9vw, 5.5rem); }
h2 { font-size: clamp(1.75rem, 5vw, 3rem); }
.hero__product { margin-bottom: var(--space-5); color: var(--color-gold-light); font-size: clamp(1.1rem, 3vw, 1.5rem); font-weight: 700; letter-spacing: 0.04em; }

.button { display: inline-flex; min-height: 3.25rem; align-items: center; justify-content: center; padding: 0.75rem 1.25rem; border: 2px solid transparent; border-radius: var(--radius); font-weight: 800; line-height: 1.2; text-align: center; text-decoration: none; cursor: pointer; transition: transform 150ms ease, background-color 150ms ease; }
.button:hover { transform: translateY(-2px); }
.button--primary { color: var(--color-black); background: var(--color-yellow); }
.button--outline { color: var(--color-black); border-color: var(--color-black); background: var(--color-white); }
.button--full { width: 100%; }

.offer { background: #f6f6f4; }
.offer__grid { display: grid; gap: var(--space-5); align-items: center; }
.product-image { margin: 0; overflow: hidden; border: 1px solid var(--color-border); box-shadow: var(--shadow); }
.product-image img { width: 100%; aspect-ratio: 1 / 1; object-fit: contain; background: var(--color-white); }
.offer__content p { margin-bottom: var(--space-2); font-size: 1.125rem; }
.offer__content .button { margin-top: var(--space-3); }

.summary { border-block: 1px solid var(--color-border); }
.summary__content { max-width: 42rem; }
.summary__list { margin: var(--space-4) 0; }
.summary__list > div { display: flex; justify-content: space-between; gap: var(--space-4); padding-block: var(--space-2); border-bottom: 1px solid var(--color-border); }
.summary__list dt { color: var(--color-ink-muted); }
.summary__list dd { margin: 0; font-weight: 700; text-align: right; }
.summary__list .summary__total { border-bottom: 0; font-size: 1.2rem; }
.line-contact { margin-bottom: 0; }

.order { background: var(--color-black); color: var(--color-white); }
.order__container { max-width: 46rem; }
.order__intro { color: var(--color-gold-light); }
.honeypot { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.form-grid { display: grid; gap: var(--space-3); }
label { display: grid; gap: 0.4rem; font-weight: 700; }
input, textarea { width: 100%; border: 1px solid transparent; border-radius: var(--radius); padding: 0.75rem; color: var(--color-black); background: var(--color-white); }
textarea { resize: vertical; }
input[aria-invalid="true"], textarea[aria-invalid="true"], .field-error { border-color: var(--color-error); box-shadow: 0 0 0 2px rgb(180 35 24 / 30%); }
.order-total { display: flex; justify-content: space-between; gap: var(--space-3); margin-block: var(--space-4); padding-top: var(--space-3); border-top: 1px solid rgb(255 255 255 / 35%); font-size: 1.2rem; }
.order-total strong { color: var(--color-gold-light); }
.form-status { min-height: 1.6em; margin-bottom: var(--space-3); color: var(--color-gold-light); }
.form-status[aria-invalid="true"] { color: #ffb4ab; }

.confirmation { text-align: center; }
.confirmation__content { max-width: 42rem; }
.site-footer { padding-block: var(--space-4); color: var(--color-white); background: var(--color-black); }
.site-footer .container { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-2) var(--space-4); }
.mobile-order-cta { position: fixed; z-index: 20; right: 1rem; bottom: 1rem; left: 1rem; box-shadow: var(--shadow); }

@media (min-width: 375px) {
  .container { width: min(calc(100% - 2.5rem), var(--max-width)); }
}

@media (min-width: 768px) {
  body { padding-bottom: 0; }
  .section { padding-block: var(--space-7); }
  .hero__content { grid-template-columns: minmax(0, 1fr) minmax(15rem, 0.75fr); gap: var(--space-6); padding-block: var(--space-6); }
  .hero__image { width: min(100%, 27rem); justify-self: end; }
  .offer__grid { grid-template-columns: minmax(0, 1fr) minmax(16rem, 0.8fr); gap: var(--space-6); }
  .form-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .form-grid__full { grid-column: 1 / -1; }
  .mobile-order-cta { display: none; }
}

@media (min-width: 1024px) {
  .hero__content { padding-block: 6rem; }
  .offer__grid { grid-template-columns: minmax(0, 1.1fr) minmax(20rem, 0.75fr); }
  .order__container { max-width: 52rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}