/* ARGUS Protocol static site */
:root {
  --bg: #fbfaf7;
  --surface: #f1f4f1;
  --text: #252826;
  --muted: #5d665f;
  --accent: #3f6f5c;
  --accent-dark: #23483a;
  --border: #d9ded8;
  --header-bg: #17241f;
  --header-text: #f5f3ec;
  --focus: #b9852e;
  --max-width: 880px;
  --wide-width: 1120px;
  --font-body: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-heading: Georgia, "Times New Roman", serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 17px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font-body);
  line-height: 1.68;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent);
}

a:focus-visible,
button:focus-visible,
main:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: 0;
  z-index: 20;
  transform: translateY(-120%);
  background: #fff;
  color: var(--text);
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border);
}

.skip-link:focus {
  transform: translateY(0.5rem);
}

.site-header {
  color: var(--header-text);
  background:
    linear-gradient(90deg, rgba(23, 36, 31, 0.96), rgba(31, 59, 48, 0.9)),
    var(--header-bg);
  border-bottom: 4px solid var(--accent);
}

.site-header__inner {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 1.1rem 1.25rem;
  display: flex;
  gap: 1.25rem;
  align-items: center;
  justify-content: space-between;
}

.brand {
  color: inherit;
  text-decoration: none;
  display: flex;
  gap: 0.9rem;
  align-items: center;
  min-width: 13rem;
}

.brand__logo {
  width: 4.2rem;
  height: 4.2rem;
  flex: 0 0 auto;
}

.brand__text {
  display: grid;
  gap: 0.15rem;
}

.brand__text strong {
  font-family: var(--font-heading);
  font-size: 2rem;
  line-height: 1;
  letter-spacing: 0;
}

.brand__text span {
  color: rgba(245, 243, 236, 0.82);
  font-size: 0.9rem;
  line-height: 1.35;
  max-width: 23rem;
}

.primary-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.primary-nav a,
.lang-nav a {
  border-radius: 4px;
  padding: 0.36rem 0.55rem;
  text-decoration: none;
  line-height: 1.2;
}

.primary-nav a {
  color: var(--header-text);
}

.primary-nav a:hover,
body[data-page="home"] .primary-nav a[data-nav="home"],
body[data-page="protocol"] .primary-nav a[data-nav="protocol"],
body[data-page="notice"] .primary-nav a[data-nav="notice"],
body[data-page="versions"] .primary-nav a[data-nav="versions"],
body[data-page="faq"] .primary-nav a[data-nav="faq"],
body[data-page="license"] .primary-nav a[data-nav="license"],
body[data-page="contact"] .primary-nav a[data-nav="contact"] {
  background: rgba(255, 255, 255, 0.14);
}

.lang-nav {
  display: flex;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.55rem 1rem;
  background: #fff;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
}

.lang-nav a.active {
  background: var(--accent-dark);
  color: #fff;
}

main {
  max-width: var(--max-width);
  margin: 2.4rem auto;
  padding: 0 1.25rem;
}

main > :first-child {
  margin-top: 0;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  line-height: 1.25;
  letter-spacing: 0;
}

h1 {
  font-size: 2.25rem;
  margin: 0 0 1.2rem;
}

h2 {
  font-size: 1.55rem;
  margin: 2.5rem 0 0.8rem;
  color: var(--accent-dark);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.35rem;
}

h3 {
  font-size: 1.28rem;
  margin: 2rem 0 0.7rem;
}

h4 {
  font-size: 1.08rem;
  margin: 1.5rem 0 0.5rem;
  color: var(--muted);
}

p,
ul,
ol,
blockquote {
  margin-top: 0;
  margin-bottom: 1rem;
}

ul,
ol {
  padding-left: 1.45rem;
}

li + li {
  margin-top: 0.25rem;
}

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 1.5rem 0;
}

strong {
  color: #1f2622;
}

.download-panel {
  margin-top: 2.5rem;
  padding: 1rem 1.15rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.download-panel h2 {
  margin-top: 0;
  font-size: 1.2rem;
}

.download-panel ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  padding: 0;
  margin: 0;
}

.download-panel a {
  display: inline-flex;
  min-width: 5rem;
  justify-content: center;
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 0.45rem 0.75rem;
  text-decoration: none;
  background: #fff;
}

.site-footer {
  max-width: var(--wide-width);
  margin: 3rem auto 0;
  padding: 1.3rem 1.25rem 2rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  text-align: center;
  font-size: 0.9rem;
}

.site-footer nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.45rem 1rem;
  margin-bottom: 0.6rem;
}

.site-footer p {
  margin-bottom: 0;
}

@media (max-width: 820px) {
  .site-header__inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .primary-nav {
    justify-content: flex-start;
  }
}

@media (max-width: 560px) {
  html {
    font-size: 16px;
  }

  .site-header__inner {
    padding: 0.9rem 1rem;
  }

  .brand {
    min-width: 0;
  }

  .brand__logo {
    width: 3.2rem;
    height: 3.2rem;
  }

  .brand__text strong {
    font-size: 1.55rem;
  }

  .primary-nav,
  .lang-nav {
    width: 100%;
    overflow-x: auto;
    justify-content: flex-start;
    scrollbar-width: thin;
  }

  .primary-nav {
    flex-wrap: nowrap;
    padding-bottom: 0.1rem;
  }

  .primary-nav a,
  .lang-nav a {
    white-space: nowrap;
  }

  main {
    margin: 1.6rem auto;
    padding: 0 1rem;
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.32rem;
  }

  .download-panel ul {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .download-panel a {
    min-width: 0;
  }
}

@media print {
  .skip-link,
  .site-header,
  .lang-nav,
  .download-panel,
  .site-footer {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
    font-size: 12pt;
  }

  main {
    max-width: none;
    margin: 0;
    padding: 0;
  }

  a {
    color: #000;
    text-decoration: none;
  }
}