/* ==========================================================================
   Nara Accounting — ชั้นสไตล์ของเว็บไซต์ (ต่อยอดจาก ds.css ซึ่งเป็นดีไซน์ซิสเต็ม)
   ========================================================================== */

:root {
  /* เติมฟอนต์ไทยเป็นตัวสำรอง เพราะ Barlow / Barlow Condensed ไม่มีอักขระไทย */
  --font-heading: "Barlow Condensed", "Chakra Petch", system-ui, sans-serif;
  --font-body: "Barlow", "IBM Plex Sans Thai", system-ui, sans-serif;
  --maxw: 1160px;
  --gutter: clamp(20px, 5vw, 72px);
}

html { scroll-behavior: smooth; scroll-padding-top: 84px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  text-wrap: pretty;
  background:
    linear-gradient(color-mix(in srgb, var(--color-accent) 6%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--color-accent) 6%, transparent) 1px, transparent 1px),
    var(--color-bg);
  background-size: 24px 24px;
}

h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading); font-weight: 700; letter-spacing: 0; }
a { color: var(--color-accent-700); }
a:hover { color: var(--color-accent-800); }
.btn { font-family: var(--font-heading); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--color-accent); color: var(--color-bg);
  padding: 10px 16px; font-size: 14px; text-decoration: none;
}
.skip-link:focus { left: 8px; top: 8px; color: var(--color-bg); }

/* ── layout ───────────────────────────────────────────────────────────── */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }
.sec { padding: 60px 0; }
.page-hero { padding: 64px 0 40px; }
.split {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px clamp(24px, 5vw, 96px); align-items: start;
}
#why.split { align-items: center; }
.grid { display: grid; gap: clamp(24px, 3vw, 48px); }
.grid-280 { grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr)); }
.grid-260 { grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr)); }
.grid-220 { grid-template-columns: repeat(auto-fit, minmax(min(220px, 100%), 1fr)); }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-auto { margin-top: auto; }

/* ── nav ──────────────────────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 40;
  gap: clamp(12px, 2vw, 20px);
  padding: 10px var(--gutter);
  padding-inline: max(var(--gutter), calc((100% - var(--maxw)) / 2 + var(--gutter)));
  background: color-mix(in srgb, var(--color-bg) 90%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.nav.is-stuck { border-bottom-color: var(--color-divider); box-shadow: 0 1px 12px color-mix(in srgb, #2b2b2d 8%, transparent); }
.nav-brand {
  letter-spacing: .04em; text-decoration: none; color: var(--color-text);
  display: inline-flex; align-items: center; gap: 10px; margin-right: auto;
}
.nav-brand img { height: 44px; width: auto; mix-blend-mode: multiply; }
.nav-links { display: flex; align-items: center; gap: clamp(12px, 2vw, 20px); }
.nav-links a { white-space: nowrap; }
.nav-links a[aria-current="page"] { color: var(--color-accent-700); }
.nav-cta { color: var(--color-bg); }
.nav-cta:hover { color: var(--color-bg); }

.nav-toggle {
  display: none; align-items: center; justify-content: center;
  width: 42px; height: 42px; padding: 0; cursor: pointer;
  background: transparent; color: var(--color-text);
  border: 1px solid var(--color-divider);
}
.nav-toggle .ico-close { display: none; }
.nav-toggle[aria-expanded="true"] .ico-open { display: none; }
.nav-toggle[aria-expanded="true"] .ico-close { display: block; }

@media (max-width: 900px) {
  .nav { flex-wrap: wrap; row-gap: 0; }
  .nav-toggle { display: inline-flex; }
  .nav-links {
    display: none; width: 100%; flex-direction: column; align-items: stretch;
    gap: 0; margin-top: 10px; border-top: 1px solid var(--color-divider);
  }
  .nav-links.open { display: flex; }
  .nav-links a {
    padding: 14px 2px; font-size: 16px;
    border-bottom: 1px solid color-mix(in srgb, var(--color-text) 8%, transparent);
  }
  .nav-links .nav-cta {
    border: 1px solid var(--color-accent); margin: 14px 0 12px;
    padding: 12px; justify-content: center; font-size: 15px;
  }
}

/* ── typography helpers ───────────────────────────────────────────────── */
.kicker {
  display: block; font-size: 13px; letter-spacing: .08em; text-transform: uppercase;
  font-weight: 600; color: var(--color-accent-700); margin: 0 0 12px;
}
.rule { height: 1px; border: 0; margin: 0 0 32px; background: var(--color-divider); }
h1.underline, h2.underline {
  display: inline-block; margin: 0;
  padding-bottom: 12px; border-bottom: 3px solid var(--color-accent);
}
h1.underline { font-size: clamp(32px, 4.4vw, 58px); line-height: 1.3; }
h2.underline { font-size: clamp(24px, 2.6vw, 32px); line-height: 1.4; }
h2.underline.sm { font-size: 24px; padding-bottom: 10px; }
.lede { font-size: 17px; line-height: 1.85; max-width: 62ch; margin: 24px 0 0; }
.sec-p { font-size: 15px; line-height: 1.85; max-width: 62ch; margin: 14px 0 0; color: color-mix(in srgb, var(--color-text) 82%, transparent); }
.fit-note { font-size: 14px; line-height: 1.75; margin: 14px 0 0; color: color-mix(in srgb, var(--color-text) 65%, transparent); }
.fine-print { font-size: 13px; line-height: 1.85; margin: 24px 0 0; color: color-mix(in srgb, var(--color-text) 65%, transparent); }
.more-link { margin: 28px 0 0; }
.more-link a { font-size: 15px; font-weight: 600; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 28px; }
.btn-row .btn { font-size: 15px; padding: 10px 16px; }
.nav .btn { font-size: 14px; }

/* ── hero ─────────────────────────────────────────────────────────────── */
.hero {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(min(320px, 100%), 1fr));
  gap: 40px clamp(24px, 4vw, 72px); align-items: center; padding: 56px 0;
}
.hero h1 span { display: block; }
.hero-mark { padding: clamp(24px, 4vw, 48px); display: flex; align-items: center; justify-content: center; }
.hero-mark img { width: 100%; max-width: 400px; height: auto; mix-blend-mode: multiply; }

/* ── watermark ────────────────────────────────────────────────────────── */
.watermark-sec { position: relative; }
.watermark {
  position: absolute; right: 0; top: 24px; width: clamp(160px, 22vw, 300px); height: auto;
  opacity: .07; filter: grayscale(1); mix-blend-mode: multiply; pointer-events: none; z-index: -1;
}

/* ── cards ────────────────────────────────────────────────────────────── */
.pad-24 { padding: 24px; }
.ico { width: 28px; height: 28px; display: block; }
.card-h { font-size: 22px; line-height: 1.45; margin: 16px 0 0; }
.card-p { font-size: 15px; line-height: 1.8; margin: 10px 0 0; color: color-mix(in srgb, var(--color-text) 78%, transparent); }
.card-cta { display: flex; flex-direction: column; align-items: flex-start; }
.card-cta .card-p { margin-bottom: 16px; }

/* ── numbered list / steps ────────────────────────────────────────────── */
.num-list { list-style: none; padding: 0; margin: 22px 0 0; display: grid; gap: 14px; }
.num-list li {
  font-size: 15px; line-height: 1.8; padding-left: 30px; position: relative;
  color: color-mix(in srgb, var(--color-text) 85%, transparent);
}
.num-list li > span {
  position: absolute; left: 0; top: 2px; font-size: 13px; font-weight: 600;
  letter-spacing: .08em; color: var(--color-accent-700);
}
.step { border-top: 1px solid var(--color-divider); padding-top: 16px; }
.step-n { font-family: var(--font-heading); font-weight: 600; font-size: 28px; color: var(--color-accent-700); }
.step h2, .step h3 { font-size: 20px; line-height: 1.45; margin: 8px 0 0; }
.step p { font-size: 14px; line-height: 1.8; margin: 8px 0 0; color: color-mix(in srgb, var(--color-text) 78%, transparent); }

/* ── spec plate ───────────────────────────────────────────────────────── */
.plate-head { display: flex; flex-wrap: wrap; align-items: stretch; border-bottom: 1px solid var(--color-divider); }
.plate-title {
  flex: 1; min-width: 16ch; padding: 12px 24px; font-size: 13px; line-height: 24px;
  letter-spacing: .06em; text-transform: uppercase; font-weight: 600;
}
.plate-tag {
  border-left: 1px solid var(--color-divider); white-space: nowrap;
  color: color-mix(in srgb, var(--color-text) 70%, transparent);
  padding: 12px 24px; font-size: 13px; line-height: 24px;
  letter-spacing: .08em; text-transform: uppercase; font-weight: 600;
}
.plate-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(240px, 100%), 1fr)); }
.plate-grid > div { padding: 20px 24px; border-top: 1px solid var(--color-divider); }
.lbl {
  display: block; font-size: 12px; letter-spacing: .08em; text-transform: uppercase;
  font-weight: 600; color: color-mix(in srgb, var(--color-text) 70%, transparent);
}
.val { font-family: var(--font-heading); font-weight: 600; font-size: 24px; }
.plate-foot {
  margin: 0; padding: 12px 24px; border-top: 1px solid var(--color-divider);
  font-size: 13px; line-height: 24px; color: color-mix(in srgb, var(--color-text) 70%, transparent);
}

/* ── definition blocks (contact) ──────────────────────────────────────── */
.def-stack { display: grid; gap: 24px; }
.deft { border-top: 1px solid var(--color-divider); padding-top: 12px; }
.deft .big {
  font-family: var(--font-heading); font-weight: 600; font-size: 24px;
  text-decoration: none; display: inline-block; margin-top: 2px;
}
.deft .brk { word-break: break-all; }
.deft .sub { display: block; font-size: 13px; line-height: 1.8; color: color-mix(in srgb, var(--color-text) 70%, transparent); }
.addr { font-size: 15px; line-height: 1.8; margin: 4px 0 0; }

/* ── deliverables list ────────────────────────────────────────────────── */
.deliver { align-self: start; }
.deliver-h { display: block; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; font-weight: 700; margin: 0 0 12px; }
.tick-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; font-size: 15px; line-height: 1.7; }
.tick-list li { border-top: 1px solid var(--color-divider); padding-top: 10px; }
.tick-list.sm { font-size: 14px; gap: 8px; margin: 18px 0 0; }
.tick-list.sm li { padding-top: 8px; }

/* ── pricing ──────────────────────────────────────────────────────────── */
.plan { padding: 28px 24px; display: flex; flex-direction: column; }
.plan.featured { border-color: var(--color-accent); }
.plan-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 22px; }
.plan-tier { font-size: 12px; letter-spacing: .1em; text-transform: uppercase; font-weight: 600; color: color-mix(in srgb, var(--color-text) 70%, transparent); }
.plan-price { display: flex; align-items: baseline; gap: 8px; margin-top: 12px; }
.plan-price .amt { font-family: var(--font-heading); font-weight: 600; font-size: 44px; line-height: 1; }
.plan-price .unit { font-size: 14px; color: color-mix(in srgb, var(--color-text) 70%, transparent); }
.plan-desc { font-size: 14px; line-height: 1.8; margin: 14px 0 0; color: color-mix(in srgb, var(--color-text) 78%, transparent); }
.plan-btn { margin-top: auto; align-self: flex-start; }
.plan .tick-list { flex: 1; }
.plan-btn { margin-top: 24px; }

.table-scroll { overflow-x: auto; }
.price-table { table-layout: auto; min-width: 620px; }
.price-table th {
  padding: 12px 24px 12px 0; font-size: 12px; font-weight: 700; color: var(--color-text);
  border-bottom: 2px solid var(--color-accent); letter-spacing: .06em; text-transform: none;
}
.price-table th:first-child { padding-left: 24px; letter-spacing: .08em; }
.price-table td { padding: 12px 24px 12px 0; vertical-align: middle; }
.price-table .t-no { padding-left: 24px; font-size: 13px; font-weight: 600; letter-spacing: .08em; color: var(--color-accent-700); }
.price-table .t-name { font-size: 15px; }
.price-table .t-price { font-family: var(--font-heading); font-weight: 600; font-size: 22px; white-space: nowrap; }
.price-table .t-note { font-size: 14px; color: color-mix(in srgb, var(--color-text) 78%, transparent); }
.price-table .c-no { width: 72px; }
.price-table .c-price { width: 24%; }
.price-table .c-note { width: 30%; }

/* ── contact form ─────────────────────────────────────────────────────── */
.contact-split { align-items: start; }
.form-card { padding: 28px 24px; }
.form-sub { font-size: 14px; line-height: 1.8; margin: 10px 0 0; color: color-mix(in srgb, var(--color-text) 70%, transparent); }
.quote-form { display: grid; gap: 16px; margin-top: 20px; }
.f-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(180px, 100%), 1fr)); gap: 16px; }
.field { display: grid; gap: 6px; font-size: 13px; font-weight: 600; }
.field .req { color: var(--color-accent-700); }
.quote-form .input { font-family: var(--font-body); font-size: 15px; min-height: 42px; padding: 8px 10px; }
.quote-form select.input { height: 42px; }
.quote-form textarea.input { min-height: 104px; resize: vertical; padding-top: 10px; }
.quote-form .input:invalid:not(:placeholder-shown) { border-color: #b4453c; }
.btn-block { width: 100%; padding: 12px; font-size: 15px; }
.form-note { font-size: 12px; line-height: 1.75; margin: 0; color: color-mix(in srgb, var(--color-text) 60%, transparent); }
.form-error {
  margin: 0; font-size: 14px; line-height: 1.7; color: #8f322a;
  border-left: 3px solid #b4453c; padding: 8px 12px;
  background: color-mix(in srgb, #b4453c 8%, transparent);
}
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-success { margin-top: 24px; border-top: 1px solid var(--color-divider); padding-top: 20px; }
.form-success p { font-size: 15px; line-height: 1.85; margin: 10px 0 0; }
.is-busy { opacity: .6; pointer-events: none; }

/* ── footer ───────────────────────────────────────────────────────────── */
.site-footer {
  padding: 48px 0; border-top: 1px solid var(--color-divider);
  font-size: 13px; line-height: 1.9; color: color-mix(in srgb, var(--color-text) 72%, transparent);
}
.site-footer img { height: 72px; width: auto; mix-blend-mode: multiply; display: block; margin-bottom: 16px; }
.foot-lines { margin: 0; }
.foot-nav { display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 20px 0 0; }
.foot-nav a { font-size: 13px; text-decoration: none; }
.foot-nav a:hover { text-decoration: underline; }
.foot-copy { margin: 20px 0 0; font-size: 12px; }

/* ── small screens ────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .sec { padding: 44px 0; }
  .page-hero { padding: 40px 0 28px; }
  .hero { padding: 36px 0 40px; }
  .lede { font-size: 16px; }
  .watermark { top: 8px; width: 140px; }
  .plate-title, .plate-tag, .plate-grid > div, .plate-foot { padding-inline: 18px; }
  .btn-row .btn { flex: 1 1 auto; justify-content: center; }
}