:root {
  --color-primary: #4bb9b4;
  --color-primary-dark: #237f7b;
  --color-text: #202124;
  --color-muted: #5f6368;
  --color-border: #dfe3e4;
  --color-soft: #eef9f8;
  --color-white: #ffffff;
  --content-width: 1160px;
  --article-width: 760px;
  --radius-small: 8px;
  --radius-medium: 14px;
  --shadow-focus: 0 0 0 4px rgb(75 185 180 / 22%);
  font-family: Inter, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-white);
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-white);
  color: var(--color-text);
  font-size: 17px;
  line-height: 1.7;
}

img,
svg {
  display: block;
}

a {
  color: var(--color-primary-dark);
  overflow-wrap: anywhere;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: #155e5b;
}

a:focus-visible {
  border-radius: 4px;
  outline: none;
  box-shadow: var(--shadow-focus);
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: var(--radius-small);
  background: var(--color-text);
  color: var(--color-white);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-white);
}

.header-inner,
.page-shell,
.site-footer-inner {
  width: min(calc(100% - 40px), var(--content-width));
  margin-inline: auto;
}

.header-inner {
  min-height: 92px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: var(--color-text);
  text-decoration: none;
}

.brand-mark {
  width: 54px;
  height: 54px;
  object-fit: contain;
}

.brand-copy {
  display: grid;
  line-height: 1.05;
}

.brand-name {
  color: var(--color-primary-dark);
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.brand-subtitle {
  margin-top: 5px;
  color: var(--color-muted);
  font-size: 0.78rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 26px;
}

.site-nav a {
  color: var(--color-text);
  font-size: 0.95rem;
  font-weight: 650;
  text-decoration: none;
}

.site-nav a[aria-current="page"] {
  color: var(--color-primary-dark);
  text-decoration: underline;
  text-decoration-color: var(--color-primary);
  text-decoration-thickness: 2px;
  text-underline-offset: 9px;
}

.home-main {
  overflow: hidden;
}

.hero {
  width: min(calc(100% - 40px), var(--content-width));
  min-height: 570px;
  margin-inline: auto;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(280px, 0.92fr);
  align-items: center;
  gap: 70px;
  padding-block: 88px 78px;
}

.hero h1,
.article-header h1 {
  margin: 0;
  color: #1f2023;
  font-size: clamp(2.8rem, 6vw, 5rem);
  line-height: 1.02;
  letter-spacing: -0.05em;
}

.hero-copy > p {
  max-width: 640px;
  margin: 28px 0 32px;
  color: #3f4246;
  font-size: clamp(1.1rem, 2.2vw, 1.45rem);
  line-height: 1.55;
}

.hero-copy {
  min-width: 0;
}

.primary-link {
  display: inline-flex;
  align-items: center;
  gap: 18px;
  min-height: 54px;
  padding: 12px 22px;
  border: 2px solid var(--color-primary-dark);
  border-radius: var(--radius-small);
  background: var(--color-primary-dark);
  color: var(--color-white);
  font-weight: 750;
  text-decoration: none;
}

.primary-link:hover {
  background: #155e5b;
  color: var(--color-white);
}

.hero-mark-wrap {
  display: grid;
  place-items: center;
  min-height: 360px;
}

.hero-mark {
  width: min(100%, 390px);
  filter: drop-shadow(0 24px 18px rgb(32 33 36 / 14%));
}

.home-section {
  width: min(calc(100% - 40px), 980px);
  margin-inline: auto;
  padding-block: 66px;
  border-top: 1px solid var(--color-border);
}

.section-heading {
  display: flex;
  align-items: stretch;
  gap: 22px;
  margin: 0 0 36px;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.14;
  letter-spacing: -0.035em;
}

.section-heading::before {
  content: "";
  width: 5px;
  flex: 0 0 5px;
  border-radius: 2px;
  background: var(--color-primary);
}

.feature-list,
.principle-list {
  display: grid;
  gap: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.feature-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.feature-item,
.principle-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  align-items: center;
  gap: 18px;
  min-height: 66px;
}

.icon-wrap {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  color: var(--color-primary-dark);
}

.icon-wrap svg {
  width: 36px;
  height: 36px;
  stroke: currentColor;
  stroke-width: 1.8;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.feature-item strong,
.principle-item strong {
  font-size: 1.05rem;
  font-weight: 650;
}

.permissions-copy {
  max-width: 850px;
  font-size: 1.08rem;
}

.scope-list {
  display: grid;
  gap: 12px;
  margin: 28px 0 0;
  padding-left: 24px;
}

.contact-line {
  margin-top: 34px;
  font-weight: 650;
}

.site-footer {
  margin-top: 44px;
  border-top: 1px solid var(--color-border);
  background: #fbfcfc;
}

.site-footer-inner {
  padding-block: 30px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px 30px;
  color: var(--color-muted);
  font-size: 0.88rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 26px;
}

.article-layout {
  display: grid;
  grid-template-columns: 230px minmax(0, var(--article-width));
  justify-content: center;
  gap: 62px;
  padding-block: 66px 86px;
}

.article-layout > * {
  min-width: 0;
}

.article-toc {
  position: sticky;
  top: 24px;
  align-self: start;
  padding-right: 28px;
  border-right: 1px solid var(--color-border);
}

.article-toc strong {
  display: block;
  margin-bottom: 16px;
  color: var(--color-muted);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.article-toc ol {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 22px;
  font-size: 0.86rem;
  line-height: 1.35;
}

.article-toc li::marker {
  color: var(--color-primary-dark);
  font-weight: 700;
}

.article-toc a {
  color: var(--color-text);
  text-decoration: none;
}

.article-header {
  margin-bottom: 50px;
}

.article-header h1 {
  font-size: clamp(2.5rem, 5vw, 4.25rem);
}

.updated-date {
  margin: 20px 0 26px;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.article-lead {
  font-size: 1.12rem;
}

.policy-section {
  scroll-margin-top: 24px;
  margin-block: 44px;
}

.policy-section h2 {
  margin: 0 0 14px;
  color: #176a67;
  font-size: 1.55rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.policy-section h3 {
  margin: 28px 0 10px;
  font-size: 1.08rem;
}

.policy-section p,
.policy-section ul {
  margin-block: 12px;
}

.policy-section ul {
  padding-left: 24px;
}

.policy-section li + li {
  margin-top: 8px;
}

.disclosure {
  margin-top: 22px;
  padding: 20px 22px;
  border: 1px solid #8fd5d1;
  border-left: 5px solid var(--color-primary-dark);
  border-radius: var(--radius-small);
  background: var(--color-soft);
}

.disclosure p {
  margin: 0;
}

.plain-note {
  padding: 18px 20px;
  border-left: 4px solid var(--color-primary);
  background: #f8fbfb;
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 30px;
    padding-block: 64px;
  }

  .hero-mark-wrap {
    min-height: 230px;
    order: -1;
  }

  .hero-mark {
    width: min(64vw, 260px);
  }

  .article-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .article-toc {
    position: static;
    padding: 0 0 28px;
    border-right: 0;
    border-bottom: 1px solid var(--color-border);
  }

  .article-toc ol {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  body {
    font-size: 16px;
  }

  .header-inner {
    min-height: auto;
    padding-block: 18px;
    align-items: stretch;
    flex-direction: column;
    gap: 14px;
  }

  .brand-mark {
    width: 44px;
    height: 44px;
  }

  .brand-subtitle {
    display: none;
  }

  .site-nav {
    justify-content: flex-start;
    gap: 9px 18px;
    padding-top: 12px;
    border-top: 1px solid var(--color-border);
  }

  .site-nav a {
    font-size: 0.84rem;
  }

  .hero {
    min-height: auto;
    padding-block: 46px 58px;
  }

  .hero h1 {
    font-size: clamp(2.35rem, 11.5vw, 3rem);
    overflow-wrap: anywhere;
  }

  .hero-mark-wrap {
    min-height: 190px;
  }

  .hero-mark {
    width: min(56vw, 220px);
  }

  .primary-link {
    width: 100%;
    justify-content: space-between;
  }

  .home-section {
    padding-block: 50px;
  }

  .feature-list {
    grid-template-columns: 1fr;
  }

  .section-heading {
    gap: 15px;
  }

  .article-layout {
    padding-block: 46px 64px;
  }

  .article-header h1 {
    max-width: 100%;
    overflow-wrap: anywhere;
  }

  .article-toc ol {
    grid-template-columns: 1fr;
  }

  .site-footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}