:root {
  --teal: #159588; --teal-dark: #0d6e64; --green: #5cb85f; --lime: #a9cf63;
  --ink: #1c2b2a; --muted: #5c6b6a; --bg: #f7faf9; --card: #ffffff; --line: #e2ebe9;
  --header-bg: #ffffff; --alt-bg: #eef5f3;
  --tag-bg: #e7f3ec; --tag-ink: #0d6e64;
  --input-bg: #ffffff; --input-line: #c9d8d5;
  --footer-bg: #1c2b2a; --footer-ink: #cfe0dd;
  --hero-grad: linear-gradient(160deg, #0d6e64, #159588 55%, #2ba58f);
  --hero-accent: #a9cf63;
  --btn-ink: #1c2b2a;
  --radius: 14px;
}

/* ── Themes (selected in admin → ตั้งค่าบริษัท) ─────────────── */
body.theme-dark {
  --bg: #0d1514; --card: #151f1e; --ink: #e9f2f0; --muted: #9ab3ae; --line: #233230;
  --teal: #2dd4bf; --teal-dark: #14b8a6; --lime: #a3e635;
  --header-bg: #121c1a; --alt-bg: #111a19;
  --tag-bg: #1d2b29; --tag-ink: #7fe0d2;
  --input-bg: #0f1918; --input-line: #2c3d3a;
  --footer-bg: #0a100f; --footer-ink: #9ab3ae;
  --hero-grad: linear-gradient(160deg, #0b3f39, #0d6e64 60%, #10897a);
  --hero-accent: #a3e635;
}
body.theme-emerald {
  --teal: #059669; --teal-dark: #065f46; --lime: #84cc16;
  --bg: #f5fbf7; --alt-bg: #e9f7ef; --line: #d8ecdf;
  --tag-bg: #d1fae5; --tag-ink: #065f46;
  --footer-bg: #022c22; --hero-accent: #bef264;
  --hero-grad: linear-gradient(135deg, #022c22, #065f46 45%, #059669 80%, #34d399);
  --radius: 22px;
}
body.theme-mono {
  --teal: #0f766e; --teal-dark: #111827; --lime: #111827; --btn-ink: #ffffff;
  --ink: #111827; --muted: #6b7280; --bg: #fafafa; --card: #ffffff; --line: #e5e7eb;
  --header-bg: #ffffff; --alt-bg: #f3f4f6;
  --tag-bg: #eef2f1; --tag-ink: #111827;
  --input-line: #d1d5db;
  --footer-bg: #111827; --footer-ink: #d1d5db;
  --hero-grad: linear-gradient(160deg, #111827, #1f2937);
  --hero-accent: #e5e7eb;
  --radius: 10px;
}

* { box-sizing: border-box; }
body { margin: 0; font-family: 'Sarabun', system-ui, sans-serif; color: var(--ink); background: var(--bg); line-height: 1.65; }
a { color: var(--teal); text-decoration: none; }
img { max-width: 100%; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 760px; }
.center { text-align: center; }
.muted { color: var(--muted); }
.no-m { margin: 0; }

.site-header { background: var(--header-bg); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.nav-row { display: flex; align-items: center; justify-content: space-between; padding: 10px 20px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); }
.brand strong { display: block; letter-spacing: 0.5px; color: var(--teal); }
.brand small { display: block; color: var(--muted); font-size: 12px; }
.nav { display: flex; align-items: center; gap: 18px; }
.nav a { color: var(--ink); font-weight: 500; }
.nav a:hover { color: var(--teal); }
.btn-nav { background: var(--teal); color: #fff !important; padding: 8px 16px; border-radius: 8px; }

.hero { background: var(--hero-grad); color: #fff; padding: 84px 0; }
.hero h1 { font-size: 40px; margin: 0 0 12px; line-height: 1.3; }
.hero .accent { color: var(--hero-accent); }
.hero .lead { font-size: 18px; opacity: 0.92; max-width: 640px; }
.hero-cta { margin-top: 26px; display: flex; gap: 12px; flex-wrap: wrap; }

.btn { display: inline-block; padding: 11px 22px; border-radius: 10px; border: 1px solid transparent; font-weight: 600; cursor: pointer; font-family: inherit; font-size: 15px; }
.btn-primary { background: var(--lime); color: var(--btn-ink); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { border-color: currentColor; color: inherit; }
.section .btn-ghost { color: var(--teal); }

.section { padding: 56px 0; }
.section.alt { background: var(--alt-bg); }
.section h1 { font-size: 32px; }
.section h2 { font-size: 26px; margin-top: 0; }

.grid.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; margin-top: 20px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; color: var(--ink); }
.card-icon { font-size: 30px; }
.card h3 { margin: 10px 0 6px; }
.card p { color: var(--muted); margin: 0; }
.card.project img { width: 100%; height: 170px; object-fit: cover; border-radius: calc(var(--radius) - 4px); }
.card.project:hover { border-color: var(--teal); }

.tags { margin: 8px 0 0; }
.tag { display: inline-block; background: var(--tag-bg); color: var(--tag-ink); font-size: 12px; padding: 3px 10px; border-radius: 999px; margin: 0 6px 6px 0; }

.cta-band { background: var(--teal-dark); color: #fff; }
.full-img { border-radius: var(--radius); margin: 18px 0; }
.grid.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.gallery img { border-radius: calc(var(--radius) - 4px); }
.prose { white-space: pre-line; }

.about-brand { display: flex; gap: 18px; align-items: center; margin: 18px 0; }
.info-table { border-collapse: collapse; width: 100%; }
.info-table td { border-bottom: 1px solid var(--line); padding: 10px 8px; vertical-align: top; }
.info-table td:first-child { color: var(--muted); width: 220px; }

.form { display: flex; flex-direction: column; gap: 14px; max-width: 640px; }
.form label { display: flex; flex-direction: column; gap: 6px; font-weight: 600; }
.form input, .form textarea { font: inherit; padding: 10px 12px; border: 1px solid var(--input-line); border-radius: 8px; background: var(--input-bg); color: var(--ink); }
.form input:focus, .form textarea:focus { outline: 2px solid var(--teal); border-color: var(--teal); }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.hp { position: absolute; left: -9999px; height: 0; width: 0; opacity: 0; }
.notice { padding: 14px 18px; border-radius: 10px; margin: 14px 0; }
.notice.ok { background: #e7f6ea; color: #1d6b2f; }
.notice.err { background: #fdeaea; color: #a32222; }

.site-footer { background: var(--footer-bg); color: var(--footer-ink); padding: 40px 0 20px; margin-top: 40px; }
.site-footer a { color: var(--lime); }
body.theme-mono .site-footer a { color: #93c5fd; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 28px; }
.footer-brand { color: #fff; margin-bottom: 8px; }
.site-footer h4 { color: #fff; margin: 0 0 8px; }
.copy { border-top: 1px solid rgba(255, 255, 255, 0.12); margin-top: 24px; padding-top: 14px; font-size: 13px; opacity: 0.75; }

@media (max-width: 720px) {
  .hero h1 { font-size: 30px; }
  .nav { gap: 10px; font-size: 14px; flex-wrap: wrap; }
  .row2, .footer-grid { grid-template-columns: 1fr; }
}