:root {
  --ink: #142033;
  --muted: #5b6575;
  --line: #dbe5ef;
  --surface: #f4f8fc;
  --white: #ffffff;
  --blue: #1268f3;
  --teal: #00a99d;
  --gold: #ffb020;
  --coral: #ff6b5f;
  --red: #e5484d;
  --shadow: 0 22px 70px rgba(16, 43, 84, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(0, 169, 157, 0.14), transparent 34rem),
    radial-gradient(circle at top right, rgba(255, 176, 32, 0.18), transparent 30rem),
    var(--white);
  font-family: Arial, "Noto Sans Thai", "Tahoma", sans-serif;
  line-height: 1.6;
}

a {
  color: inherit;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 56px);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 230px;
  text-decoration: none;
}

.brand-mark {
  display: block;
  width: 48px;
  height: 48px;
  object-fit: contain;
  background: var(--white);
  border: 1px solid rgba(18, 104, 243, 0.12);
  border-radius: 50%;
  box-shadow: 0 10px 26px rgba(18, 104, 243, 0.18);
}

.brand small,
.label,
.eyebrow,
footer span {
  display: block;
  color: var(--muted);
  font-size: 0.86rem;
}

nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 18px;
  color: var(--muted);
  font-size: 0.95rem;
}

nav a {
  text-decoration: none;
}

nav a:hover {
  color: var(--blue);
}

.hero {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(0, 0.84fr) minmax(320px, 0.86fr);
  gap: clamp(24px, 4vw, 58px);
  align-items: center;
  min-height: calc(100vh - 104px);
  padding: clamp(48px, 8vw, 96px) clamp(18px, 6vw, 84px);
  background:
    linear-gradient(115deg, rgba(255, 255, 255, 0.96), rgba(244, 251, 255, 0.84) 48%, rgba(255, 245, 232, 0.9)),
    var(--surface);
}

.hero::after {
  position: absolute;
  right: -18vw;
  bottom: -26vw;
  width: 48vw;
  height: 48vw;
  content: "";
  background: radial-gradient(circle, rgba(255, 107, 95, 0.18), transparent 62%);
  pointer-events: none;
}

.hero-copy,
.hero-visual {
  position: relative;
  z-index: 1;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--teal);
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 720px;
  margin-bottom: 18px;
  font-size: clamp(1.72rem, 3.1vw, 2.85rem);
  line-height: 1.22;
}

h2 {
  margin-bottom: 12px;
  font-size: clamp(1.7rem, 3vw, 2.7rem);
  line-height: 1.18;
}

h3 {
  margin-bottom: 8px;
  font-size: 1.08rem;
}

.lede {
  max-width: 720px;
  color: var(--muted);
  font-size: clamp(0.98rem, 1.22vw, 1.12rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 700;
  text-decoration: none;
}

.button.primary {
  color: var(--white);
  background: linear-gradient(135deg, var(--blue), var(--teal));
  border-color: transparent;
  box-shadow: 0 14px 28px rgba(18, 104, 243, 0.22);
}

.button.secondary {
  color: var(--blue);
  background: var(--white);
}

.hero-visual {
  min-height: clamp(320px, 42vw, 560px);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.58)),
    url("/assets/api-gateway-hero.png") center / cover no-repeat;
  border: 1px solid var(--line);
  border-radius: 28px 8px 28px 8px;
  box-shadow: var(--shadow);
}

.quick-status {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  width: min(1180px, calc(100% - 36px));
  margin: -38px auto 0;
  position: relative;
  z-index: 2;
}

.quick-status div {
  min-width: 0;
  padding: 18px;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 12px 36px rgba(16, 43, 84, 0.1);
}

.quick-status div:nth-child(1) {
  border-top: 4px solid var(--blue);
}

.quick-status div:nth-child(2) {
  border-top: 4px solid var(--teal);
}

.quick-status div:nth-child(3) {
  border-top: 4px solid var(--gold);
}

.quick-status div:nth-child(4) {
  border-top: 4px solid var(--coral);
}

.quick-status strong {
  display: block;
  font-size: clamp(1.05rem, 1.7vw, 1.38rem);
  line-height: 1.2;
}

.band,
.content-grid,
.docs {
  padding: clamp(44px, 7vw, 86px) clamp(18px, 6vw, 84px);
}

.band {
  background:
    linear-gradient(135deg, rgba(18, 104, 243, 0.07), rgba(0, 169, 157, 0.08)),
    var(--surface);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 28px;
}

.flow,
.checklist,
.docs-grid,
.security-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.flow div,
.checklist article,
.docs-grid article,
.security-grid div {
  min-width: 0;
  padding: 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 12px 34px rgba(16, 43, 84, 0.07);
}

.flow span {
  display: grid;
  width: 34px;
  height: 34px;
  margin-bottom: 14px;
  place-items: center;
  color: var(--white);
  background: linear-gradient(135deg, var(--blue), var(--teal));
  border-radius: 50%;
  font-weight: 700;
}

.checklist article {
  border-top: 4px solid var(--blue);
}

.checklist article:nth-child(2) {
  border-top-color: var(--teal);
}

.checklist article:nth-child(3) {
  border-top-color: var(--gold);
}

.checklist article:nth-child(4) {
  border-top-color: var(--coral);
}

.docs-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

pre {
  overflow-x: auto;
  margin: 16px 0 0;
  padding: 16px;
  color: #eef7ff;
  background: linear-gradient(135deg, #172033, #0f3b5f);
  border-radius: 8px;
  font-size: 0.9rem;
}

code {
  font-family: "SFMono-Regular", Consolas, monospace;
}

.security-grid div:nth-child(2) {
  border-top: 4px solid var(--teal);
}

.security-grid div:nth-child(3) {
  border-top: 4px solid var(--gold);
}

.security-grid div:nth-child(4) {
  border-top: 4px solid var(--red);
}

footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 24px clamp(18px, 6vw, 84px);
  border-top: 1px solid var(--line);
}

.form-shell,
.admin-shell {
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
  padding: clamp(36px, 7vw, 72px) 0;
}

.form-intro {
  max-width: 820px;
  margin-bottom: 28px;
}

.request-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  padding: 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.request-form label,
.admin-toolbar {
  display: grid;
  gap: 7px;
}

.request-form span {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

.request-form input,
.request-form select,
.request-form textarea,
.admin-toolbar input,
.admin-item textarea {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
}

.request-form textarea,
.admin-item textarea {
  resize: vertical;
}

.wide {
  grid-column: 1 / -1;
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

#result,
.admin-message {
  color: var(--teal);
  font-weight: 700;
}

.admin-toolbar {
  grid-template-columns: minmax(220px, 420px) auto;
  align-items: end;
  margin-bottom: 18px;
}

.admin-list {
  display: grid;
  gap: 14px;
}

.admin-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 320px);
  gap: 18px;
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.admin-item h2 {
  margin-bottom: 8px;
  font-size: 1.25rem;
}

.admin-actions {
  display: grid;
  align-content: start;
  gap: 10px;
}

@media (max-width: 980px) {
  .hero,
  .flow,
  .checklist,
  .docs-grid,
  .security-grid,
  .quick-status {
    grid-template-columns: 1fr 1fr;
  }

  .hero {
    min-height: auto;
  }
}

@media (max-width: 680px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    justify-content: flex-start;
  }

  .hero,
  .flow,
  .checklist,
  .docs-grid,
  .security-grid,
  .quick-status,
  .request-form,
  .admin-item,
  .admin-toolbar {
    grid-template-columns: 1fr;
  }

  .quick-status {
    margin-top: -22px;
  }

  .hero-visual {
    min-height: 280px;
    border-radius: 18px 8px 18px 8px;
  }

  h1 {
    font-size: 1.58rem;
  }
}