/* ═══════════════════════════════════════════
   IRIS — iris.rodrigojazinski.com
   Style sheet
════════════════════════════════════════════ */

/* ── Reset & base ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: Georgia, 'Times New Roman', Times, serif;
  font-size: 1rem;
  line-height: 1.75;
  color: #1A1A1A;
  background: #FFFFFF;
}

/* ── Navigation ── */
#site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: #FFFFFF;
  border-bottom: 1px solid #E0E0E0;
}

.nav-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-brand {
  font-size: 0.85rem;
  font-weight: normal;
  letter-spacing: 0.12em;
  color: #4A4A4A;
  text-transform: uppercase;
  flex-shrink: 0;
  line-height: 0;
}

.nav-brand img {
  display: block;
}

#site-nav ul {
  list-style: none;
  display: flex;
  gap: 1.75rem;
  flex-wrap: wrap;
}

#site-nav a {
  font-family: Georgia, serif;
  font-size: 0.9rem;
  color: #4A4A4A;
  text-decoration: none;
  letter-spacing: 0.02em;
}

#site-nav a:hover {
  color: #2C5F8A;
}

/* ── Main layout ── */
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 6rem 1.5rem 4rem;
}

/* ── Section spacing ── */
section {
  padding: 3.5rem 0;
}

.section-inner {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.section-rule {
  border: none;
  border-top: 1px solid #E0E0E0;
  margin: 0;
}

/* ── Typography ── */
h1 {
  font-size: 2.5rem;
  font-weight: normal;
  letter-spacing: 0.04em;
  line-height: 1.2;
  color: #1A1A1A;
}

h2 {
  font-size: 1.5rem;
  font-weight: normal;
  letter-spacing: 0.02em;
  line-height: 1.3;
  color: #1A1A1A;
}

p {
  text-align: justify;
  hyphens: auto;
}

.subtitle {
  font-size: 1rem;
  color: #4A4A4A;
  letter-spacing: 0.03em;
  font-style: italic;
  text-align: left;
}

.section-meta {
  font-size: 0.95rem;
  color: #4A4A4A;
  font-style: italic;
  text-align: left;
}

.attribution {
  font-size: 0.9rem;
  color: #4A4A4A;
  font-style: italic;
}

.file-meta {
  font-size: 0.875rem;
  color: #4A4A4A;
  text-align: left;
}

/* ── Formula ── */
.formula {
  font-size: 1.35rem;
  letter-spacing: 0.08em;
  text-align: center;
  color: #1A1A1A;
  padding: 1rem 0;
  font-style: italic;
}

/* ── Parameter list ── */
.parameters {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding-left: 1.5rem;
  border-left: 2px solid #E0E0E0;
}

.parameters > div {
  display: flex;
  gap: 1rem;
  align-items: baseline;
}

.parameters dt {
  font-style: italic;
  font-weight: normal;
  min-width: 1.2rem;
  color: #1A1A1A;
}

.parameters dd {
  color: #4A4A4A;
  font-size: 0.95rem;
}

/* ── Content lists ── */
.contents-list,
.findings-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.contents-list li,
.findings-list li {
  padding-left: 1.5rem;
  position: relative;
  font-size: 0.95rem;
  color: #1A1A1A;
}

.contents-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: #4A4A4A;
}

.findings-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: #4A4A4A;
}

/* ── Archive table ── */
.archive-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.archive-table td {
  padding: 0.35rem 0.75rem 0.35rem 0;
  vertical-align: top;
  color: #1A1A1A;
}

.archive-table tbody tr:not(:last-child) td {
  border-bottom: 1px solid #F0F0F0;
}

.archive-table tfoot td {
  border-top: 1px solid #E0E0E0;
  padding-top: 0.5rem;
  color: #4A4A4A;
  font-style: italic;
  font-size: 0.875rem;
}

.archive-table td:first-child {
  white-space: nowrap;
  color: #4A4A4A;
  font-style: italic;
  min-width: 4.5rem;
}

/* ── Download link ── */
.download-link {
  display: inline-block;
  color: #2C5F8A;
  text-decoration: none;
  font-size: 0.95rem;
  border-bottom: 1px solid #B8CCD9;
  padding-bottom: 1px;
  align-self: flex-start;
}

.download-link:hover {
  color: #1A3F5C;
  border-bottom-color: #1A3F5C;
}

/* ── Archive note ── */
.archive-note {
  font-size: 0.875rem;
  color: #6A6A6A;
  font-style: italic;
  text-align: left;
}

/* ── Footer ── */
#site-footer {
  border-top: 1px solid #E0E0E0;
  margin-top: 2rem;
}

.footer-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem;
}

#site-footer p {
  font-size: 0.8rem;
  color: #6A6A6A;
  text-align: center;
}

/* ── Mobile ── */
@media (max-width: 600px) {
  h1 {
    font-size: 1.9rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  .nav-inner {
    gap: 1rem;
    padding: 0.6rem 1rem;
  }

  #site-nav ul {
    gap: 1rem;
  }

  main {
    padding: 5rem 1rem 3rem;
  }

  .formula {
    font-size: 1.15rem;
  }

  .archive-table td {
    padding-right: 0.5rem;
  }

  .archive-table td:first-child {
    min-width: 3.5rem;
  }
}