/* เว็บขาย SunUp System — ธีมสว่าง/มืดตามเครื่อง ไม่มีไลบรารี แก้สีที่ตัวแปรด้านบน */
:root {
  --bg: #EEF3F8; --panel: #fff; --panel-2: #F6F9FC; --line: #D4E0EC; --text: #1B2733; --muted: #64748B;
  --primary: #2563EB; --primary-ink: #fff; --billed: #DC2626; --free: #0D9488; --busy: #D97706; --busy-soft: #FDEBD3;
  --shadow: 0 1px 2px rgba(27,39,51,.08), 0 6px 18px rgba(27,39,51,.06);
  --font: "IBM Plex Sans Thai", "Noto Sans Thai", "Leelawadee UI", Tahoma, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
}
@media (prefers-color-scheme: dark) { :root {
  --bg: #0E141B; --panel: #16202A; --panel-2: #1B2733; --line: #2A3947; --text: #E6EDF4; --muted: #93A4B6;
  --primary: #5B8DEF; --primary-ink: #0B1220; --billed: #F26464; --free: #2DBBA9; --busy: #F0A23B; --busy-soft: #3A2B14;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 6px 18px rgba(0,0,0,.3); color-scheme: dark; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--font); font-size: 16px; line-height: 1.5; }
a { color: var(--primary); }
.num { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.hint { color: var(--muted); font-size: 14px; }
.center { text-align: center; }

.top { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 12px 20px; background: var(--panel); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 2; }
.top .brand { font-weight: 700; font-size: 20px; color: var(--primary); text-decoration: none; }
.top nav { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; justify-content: flex-end; }
.top nav a:not(.btn) { color: var(--text); text-decoration: none; font-size: 15px; }

.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 18px; border-radius: 10px; border: 1px solid var(--line); background: var(--panel); color: var(--text); font: inherit; font-weight: 600; text-decoration: none; cursor: pointer; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); }
.btn.big { min-height: 56px; padding: 0 28px; font-size: 18px; }
.btn:disabled { opacity: .6; cursor: default; }
a:focus-visible, button:focus-visible, input:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; }

.hero { text-align: center; padding: 64px 20px 48px; max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; align-items: center; }
.hero h1 { font-size: clamp(30px, 6vw, 48px); line-height: 1.2; margin: 0; }
.hero p { font-size: 18px; color: var(--muted); margin: 0; max-width: 620px; }
.hero .cta { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; margin: 8px 0; }

.sec { padding: 40px 20px; max-width: 1080px; margin: 0 auto; }
.sec.alt { max-width: none; background: var(--panel-2); }
.sec.alt > * { max-width: 1040px; margin-left: auto; margin-right: auto; }
.sec h2 { font-size: 28px; margin: 0 0 18px; text-align: center; }
.sec .lead { text-align: center; color: var(--muted); margin: -8px auto 18px; }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 18px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 10px; }
.card h3 { margin: 0; font-size: 18px; }
.card p { margin: 0; color: var(--muted); }
.pill { display: inline-block; font-size: 13px; padding: 2px 10px; border-radius: 999px; background: var(--busy-soft); color: var(--busy); vertical-align: middle; }
.plan .price b { font-size: 34px; }
.plan ul { margin: 0; padding-left: 20px; line-height: 1.8; flex: 1; }

.foot { padding: 20px; text-align: center; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); background: var(--panel); }

.form-page { width: min(560px, 100%); margin: 0 auto; padding: 32px 16px 48px; display: flex; flex-direction: column; gap: 16px; }
.form-page h1 { margin: 0; font-size: 28px; }
form { display: flex; flex-direction: column; gap: 14px; }
label { display: block; font-size: 14px; color: var(--muted); margin: 0 0 6px 2px; }
input[type=text], input[type=email], input[type=tel], input[type=password] { width: 100%; min-height: 52px; font: inherit; font-size: 17px; padding: 0 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel); color: var(--text); }
.chk { display: flex; gap: 10px; align-items: flex-start; color: var(--text); font-size: 15px; margin: 0; }
.err { color: var(--billed); font-size: 14px; margin: 4px 0 0; }
.kv { display: flex; justify-content: space-between; gap: 12px; }
.code { font-size: 34px; letter-spacing: .06em; }
.steps { line-height: 1.8; padding-left: 22px; margin: 0; }
[hidden] { display: none !important; }
@media (max-width: 600px) { .top { padding: 10px 12px; } .hero { padding-top: 40px; } }

/* หน้าข้อกำหนด/นโยบาย */
.legal { max-width: 760px; margin: 0 auto; padding: 24px 16px 48px; }
.legal h1 { margin: 0 0 4px; }
.legal h2 { margin: 32px 0 8px; padding-top: 8px; border-top: 1px solid var(--line); }
.legal h3 { margin: 18px 0 6px; font-size: 17px; }
.legal ul { padding-left: 22px; }
.legal li { margin: 4px 0; }
.legal .toc { margin: 12px 0; }
.foot a { color: inherit; }