:root {
  --color-primary: #00796b;
  --color-primary-dark: #064e3b;
  --color-primary-light: #dff6ef;
  --color-accent: #fdba2d;
  --color-accent-2: #f97316;
  --color-water: #18b7b5;
  --color-sky: #7dd3fc;
  --color-bg: #f8faf8;
  --color-sand: #fff7e6;
  --color-surface: #ffffff;
  --color-text: #1f2937;
  --color-muted: #66736f;
  --color-border: #dfe9e4;
  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 26px;
  --radius-xl: 36px;
  --shadow-card: 0 18px 46px rgba(6, 78, 59, 0.11);
  --shadow-soft: 0 10px 30px rgba(31, 41, 55, 0.08);
  --container: 1180px;
  --header-height: 76px;

  /* Additive semantic aliases and foundation tokens. */
  --color-secondary: var(--color-water);
  --color-divider: var(--color-border);
  --color-success: #15803d;
  --color-success-bg: #ecfdf3;
  --color-success-border: #86efac;
  --color-warning: #a16207;
  --color-warning-bg: #fffbeb;
  --color-warning-border: #fde68a;
  --color-error: #b91c1c;
  --color-error-bg: #fef2f2;
  --color-error-border: #fecaca;
  --color-info: #0369a1;
  --color-info-bg: #f0f9ff;
  --color-info-border: #bae6fd;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  --radius-pill: 999px;
  --shadow-floating: 0 20px 60px rgba(15, 23, 42, 0.18);
  --shadow-glow: 0 0 32px rgba(24, 183, 181, 0.25);
  --shadow-focus: 0 0 0 4px rgba(253, 186, 45, 0.28);

  --font-family-base: "Prompt", "Noto Sans Thai", system-ui, -apple-system, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-tight: 1.2;
  --line-height-base: 1.6;
  --line-height-relaxed: 1.7;

  --transition-fast: 120ms;
  --transition-base: 200ms;
  --transition-slow: 300ms;
  --ease-standard: cubic-bezier(0.2, 0, 0, 1);

  --z-base: 0;
  --z-sticky: 100;
  --z-dropdown: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-toast: 500;

  --container-max: var(--container);
  --container-padding-mobile: 16px;
  --container-padding-desktop: 32px;
  --breakpoint-sm: 480px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  font-family: "Prompt", "Noto Sans Thai", system-ui, -apple-system, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; min-height: 100vh; background: var(--color-bg); color: var(--color-text); font-family: var(--font-family-base); font-size: var(--font-size-base); }
body.menu-is-open { overflow: hidden; }
img, svg, video { display: block; max-width: 100%; }
img, video { height: auto; }
a { color: var(--color-primary-dark); }
button, input, textarea, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
h1, h2, h3, h4, h5, h6, p { margin-top: 0; }
h1, h2, h3, h4, h5, h6 { color: var(--color-primary-dark); letter-spacing: -0.02em; }
ul, ol { padding-inline-start: 1.5em; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: var(--space-3); border-bottom: 1px solid var(--color-divider); text-align: left; vertical-align: top; }
th { font-weight: var(--font-weight-semibold); }

.page-container { width: min(calc(100% - 2rem), var(--container)); margin-inline: auto; }
.page-shell { width: min(100% - 2rem, 72rem); margin-inline: auto; padding-block: clamp(2rem, 8vw, 6rem); }
.section { padding-block: clamp(4rem, 8vw, 7rem); }
.section--soft { background: linear-gradient(180deg, #eef9f4 0%, #f8faf8 100%); }
.eyebrow { margin-bottom: .6rem; color: var(--color-primary); font-size: .8rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }

.skip-link { position: fixed; z-index: 1000; top: .5rem; left: .5rem; padding: .75rem 1rem; border-radius: var(--radius-sm); transform: translateY(-160%); background: #fff; font-weight: 700; }
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 3px; }

.placeholder { padding: clamp(1.5rem, 5vw, 3rem); border-radius: var(--radius-lg); background: var(--color-surface); box-shadow: var(--shadow-card); }
.button { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; gap: .55rem; padding: .75rem 1.2rem; border: 1px solid transparent; border-radius: 999px; background: var(--color-primary); color: #fff; font-weight: 700; text-decoration: none; transition: transform .2s ease, box-shadow .2s ease, background-color .2s ease; }
.button:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(0, 121, 107, .22); }
.button svg, .text-link svg { width: 19px; fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 2; }
.button:disabled { cursor: not-allowed; opacity: .65; }
input { min-height: 44px; padding: .65rem .8rem; border: 1px solid #cbd5e1; border-radius: 12px; }
textarea, select { min-height: 44px; padding: .65rem .8rem; border: 1px solid var(--color-border); border-radius: var(--radius-sm); background: var(--color-surface); color: var(--color-text); }
textarea { min-height: 7rem; resize: vertical; }
button:disabled, input:disabled, textarea:disabled, select:disabled, [aria-disabled="true"] { cursor: not-allowed; opacity: .65; }

.sr-only, .visually-hidden { position: absolute !important; width: 1px !important; height: 1px !important; padding: 0 !important; overflow: hidden !important; clip: rect(0, 0, 0, 0) !important; white-space: nowrap !important; border: 0 !important; }
.container { width: min(calc(100% - (2 * var(--container-padding-mobile))), var(--container-max)); margin-inline: auto; }
.stack { display: flex; flex-direction: column; gap: var(--stack-space, var(--space-4)); }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: var(--cluster-space, var(--space-3)); }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, var(--grid-min, 16rem)), 1fr)); gap: var(--grid-space, var(--space-4)); }

@media (min-width: 768px) {
  .container { width: min(calc(100% - (2 * var(--container-padding-desktop))), var(--container-max)); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}