:root {
  --navy: #052e56;
  --teal: #0e9b86;
  --teal-deep: #0b7566;
  --teal-soft: #e6f6f3;
  --ink: #142033;
  --muted: #5b6b78;
  --paper: #f5f8f7;
  --card: #ffffff;
  --line: #d5e2de;
  --shadow: 0 22px 50px rgba(5, 46, 86, 0.1);
  --serif: "Fraunces", "Noto Serif Thai", Georgia, "Times New Roman", serif;
  --sans: "Outfit", "Noto Sans Thai", "Segoe UI", sans-serif;
  --header-h: 4.25rem;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --navy: #e8eef4;
    --teal: #3dcec0;
    --teal-deep: #8ee8dc;
    --teal-soft: #12352f;
    --ink: #e7eef2;
    --muted: #a9b8c2;
    --paper: #07131c;
    --card: #10202d;
    --line: #243848;
    --shadow: 0 22px 50px rgba(0, 0, 0, 0.35);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --navy: #e8eef4;
  --teal: #3dcec0;
  --teal-deep: #8ee8dc;
  --teal-soft: #12352f;
  --ink: #e7eef2;
  --muted: #a9b8c2;
  --paper: #07131c;
  --card: #10202d;
  --line: #243848;
  --shadow: 0 22px 50px rgba(0, 0, 0, 0.35);
  color-scheme: dark;
}

:root[data-theme="light"] {
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.55;
  font-size: 1.05rem;
}
img { max-width: 100%; height: auto; }
a { color: var(--teal-deep); }
a:hover { color: var(--teal); }
:focus-visible {
  outline: 3px solid var(--teal);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--navy);
  color: var(--paper);
  padding: 0.5rem 0.8rem;
  z-index: 40;
}
.skip:focus { top: 0.5rem; }

.wrap {
  width: min(1120px, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 1rem 1.25rem;
  flex-wrap: wrap;
  min-height: var(--header-h);
  padding: 0.7rem 1.1rem;
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: center;
  background: #f4f8f7;
  border-radius: 12px;
  padding: 0.28rem 0.55rem 0.22rem;
}
.brand img { height: 34px; width: auto; display: block; }
.nav {
  display: flex;
  gap: 0.35rem 1rem;
  margin-left: auto;
  flex-wrap: wrap;
}
.nav a {
  color: var(--ink);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.98rem;
}
.nav a[aria-current="page"] { color: var(--teal-deep); }
.tools { display: flex; align-items: center; gap: 0.35rem; }
.langs { display: flex; gap: 0.15rem; }
.langs a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.28rem 0.4rem;
  border-radius: 999px;
}
.langs a[aria-current="true"] {
  color: var(--navy);
  background: var(--teal-soft);
}
.theme {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 999px;
  cursor: pointer;
  display: grid;
  place-items: center;
}
.theme svg { width: 1.05rem; height: 1.05rem; }
.theme .moon { display: none; }
:root[data-theme="dark"] .theme .sun { display: none; }
:root[data-theme="dark"] .theme .moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme .sun { display: none; }
  :root:not([data-theme="light"]) .theme .moon { display: block; }
}

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.5rem;
  align-items: center;
  padding: 3.5rem 0 1.5rem;
}
.kicker {
  margin: 0 0 0.8rem;
  color: var(--teal-deep);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.78rem;
}
h1, h2, h3 { font-family: var(--serif); font-weight: 650; letter-spacing: -0.03em; line-height: 1.08; color: var(--navy); }
h1 { font-size: clamp(2.35rem, 5vw, 4.15rem); margin: 0 0 1rem; }
h1 em { font-style: normal; color: var(--teal-deep); }
h2 { font-size: clamp(1.8rem, 3vw, 2.5rem); margin: 0 0 0.8rem; }
h3 { font-size: 1.35rem; margin: 0 0 0.4rem; }
.lead { font-size: 1.18rem; color: var(--muted); margin: 0 0 1.4rem; max-width: 38rem; }
.actions { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-bottom: 1rem; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  text-decoration: none;
  border-radius: 999px;
  padding: 0.78rem 1.15rem;
  font-weight: 600;
  border: 1px solid transparent;
}
.btn-primary { background: var(--teal); color: #04261f; }
.btn-primary:hover { background: var(--teal-deep); color: #fff; }
:root[data-theme="dark"] .btn-primary,
:root:not([data-theme="light"]) .btn-primary { color: #04261f; }
.btn-ghost {
  background: transparent;
  color: var(--navy);
  border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--teal); color: var(--teal-deep); }
.note {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  max-width: 36rem;
}

.frame {
  margin: 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.frame img { display: block; width: 100%; }
.frame figcaption { padding: 0.75rem 1rem 1rem; color: var(--muted); font-size: 0.92rem; }

.band { padding: 3.2rem 0; }
.band-navy {
  background: #052e56;
  color: #e7eef4;
}
.band-navy h2, .band-navy h3 { color: #fff; }
.band-navy p, .band-navy li { color: #d5e2ea; }
.band-navy a { color: #8ee8dc; }

.includes {
  list-style: none;
  padding: 0;
  margin: 1.4rem 0 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem 1.4rem;
}
.includes li {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem 1rem 1rem 1.05rem;
}
.includes strong { display: block; color: var(--navy); font-size: 1.05rem; }
.includes span { color: var(--muted); }

.shots-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}
.steps li {
  background: var(--card);
  border-top: 4px solid var(--teal);
  border-radius: 14px;
  padding: 1rem 1rem 1.1rem;
  box-shadow: var(--shadow);
}
.steps b {
  display: block;
  font-family: var(--serif);
  color: var(--teal);
  font-size: 1.4rem;
  margin-bottom: 0.3rem;
}

.prose { max-width: 44rem; }
.prose section { margin: 0 0 1.6rem; }
.prose h2 { font-size: 1.55rem; }
.legal-meta {
  color: var(--muted);
  font-size: 0.92rem;
}
.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.8rem;
  padding: 0;
  margin: 0 0 1.6rem;
  list-style: none;
}
.toc a { text-decoration: none; font-size: 0.92rem; }

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.15rem 1.15rem 1.25rem;
  text-decoration: none;
  color: inherit;
  display: block;
}
.card:hover { border-color: var(--teal); }
.card strong { display: block; font-size: 1.15rem; color: var(--navy); margin-bottom: 0.3rem; }
.card span { color: var(--muted); }
.identity {
  margin-top: 1.5rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.2rem 1.3rem;
}
.identity p { margin: 0.2rem 0; }

.page-hero { padding: 2.6rem 0 0.4rem; }
.page-hero h1 { font-size: clamp(2.1rem, 4vw, 3.3rem); }

.site-footer {
  margin-top: 2rem;
  background: #052e56;
  color: #d5e2ea;
  padding: 2.2rem 0 1.4rem;
}
.site-footer a { color: #8ee8dc; text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }
.foot {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 1.5rem;
}
.foot strong { color: #fff; display: block; margin-bottom: 0.4rem; }
.foot ul { list-style: none; margin: 0; padding: 0; }
.foot li { margin: 0.25rem 0; }
.legal-line { margin: 1.3rem 0 0; font-size: 0.88rem; color: #b7c7d2; }

@media (max-width: 860px) {
  .hero, .shots-pair, .steps, .includes, .cards, .foot { grid-template-columns: 1fr; }
  .nav { margin-left: 0; width: 100%; }
  .hero { padding-top: 2rem; }
}