:root{
  --primary:#0ea5e9;
  --accent:#16a34a;
  --dark:#0b1220;
  --surface:#ffffff;
  --muted:#f1f5f9;
  --text:#0f172a;

  /* scale ฟอนต์ */
  --fs-100:0.875rem;  /* xs */
  --fs-200:0.95rem;   /* sm */
  --fs-300:1rem;      /* base */
  --fs-400:1.05rem;   /* lg */
  --fs-500:1.125rem;  /* xl */

  --radius:1rem;      /* lg */
  --shadow:0 10px 25px rgba(2,8,23,.06);
}
html,body{background:var(--surface);color:var(--text);font-family:system-ui,-apple-system,"Noto Sans Thai",sans-serif}

.shadow-soft{box-shadow:var(--shadow)}
.rounded-theme{border-radius:var(--radius)}

html.font-xs{font-size:var(--fs-100)}
html.font-sm{font-size:var(--fs-200)}
html.font-base{font-size:var(--fs-300)}
html.font-lg{font-size:var(--fs-400)}
html.font-xl{font-size:var(--fs-500)}

.bg-theme-none{background:none}
.bg-theme-gradient{
  background:linear-gradient(180deg,var(--bg-grad-from,#e0f2fe),var(--bg-grad-to,transparent) 60%)
}
.bg-theme-stripes{
  background:repeating-linear-gradient(135deg,var(--muted),var(--muted)12px,#fff 12px,#fff 24px)
}
.bg-theme-dots{
  background:
    radial-gradient(currentColor 1px,transparent 1px) 0 0/16px 16px,
    radial-gradient(currentColor 1px,transparent 1px) 8px 8px/16px 16px;
  color:rgba(2,8,23,.06)
}
.bg-theme-photo{background:var(--bg-image,none) center/cover no-repeat fixed}

/* ปุ่ม */
.btn-primary{background:var(--primary);border-color:var(--primary)}
.btn-primary:hover{filter:brightness(.95)}
.btn-success{background:var(--accent);border-color:var(--accent)}
.btn-success:hover{filter:brightness(.95)}

/* Navbar / Footer */
.navbar{background:var(--surface)!important}
.footer,footer{background:var(--dark);color:#cbd5e1}
.footer a,footer a{color:#e2e8f0;text-decoration:none}
.footer a:hover,footer a:hover{text-decoration:underline}