/* ============================================================
   BRAND VARIABLES — AUTH Environmental Sciences and Engineering
   ============================================================ */
:root {
  --deep-sea: #0E2A38;
  --thessaloniki-sky: #5B8FA8;
  --thessaloniki-sky-light: #7DA9C0;
  --off-white: #F7F3EC;
  --olympus-stone: #E5DED2;
  --marble-red: #7B1F2C;
  --marble-red-dark: #5C1620;
  --field-green: #6B7A4F;
  --ink: #1A1A1A;
  --ink-soft: #4A5560;
  --rule: #D8D2C4;
  --serif: Georgia, 'Times New Roman', serif;
  --sans: 'Helvetica Neue', Arial, sans-serif;
  --transition: 0.2s ease;
  --max-width: 1280px;
}

/* ============================================================
   RESET / BASE
   ============================================================ */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--off-white);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 48px;
}



/* ============================================================
   DOCUMENT PAGE — editorial composition
   Single column with constrained text width.
   Pattern: numbered sections, sidebar TOC, callouts, editorial tables.
   ============================================================ */
.doc-section {
  background: var(--off-white);
  padding: 140px 0 100px;
}
.doc-container {
  max-width: 760px;
  margin: 0 auto;
}

/* ----- HERO ----- */
.doc-hero {
  padding-bottom: 48px;
  border-bottom: 1.5px solid var(--ink);
  margin-bottom: 56px;
}
.doc-breadcrumb {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
  margin-bottom: 32px;
  line-height: 1.5;
}
.doc-breadcrumb a {
  color: var(--marble-red);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}
.doc-breadcrumb a:hover {
  color: var(--marble-red-dark);
  border-bottom-color: rgba(123, 31, 44, 0.4);
}
.doc-breadcrumb .sep {
  color: var(--rule);
  margin: 0 8px;
}
.doc-breadcrumb .current { color: var(--ink); }

.doc-eyebrow {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--marble-red);
  margin-bottom: 22px;
}

.doc-h1 {
  font-family: var(--serif);
  font-size: clamp(40px, 5.5vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--ink);
  font-weight: 400;
  margin-bottom: 28px;
  max-width: 18ch;
}
.doc-h1 em {
  font-style: italic;
  color: var(--marble-red);
}

.doc-lede {
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.65;
  color: var(--ink-soft);
  margin-bottom: 22px;
  max-width: 620px;
}
.doc-lede strong {
  color: var(--ink);
  font-weight: 600;
}

/* Meta strip — last-updated, print link */
.doc-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding-top: 28px;
  margin-top: 12px;
  border-top: 1px solid var(--rule);
}
.doc-meta-updated .label {
  color: var(--marble-red);
  margin-right: 10px;
}
.doc-meta-updated .date {
  color: var(--ink);
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: none;
  font-family: var(--serif);
  font-style: italic;
}
.doc-meta-print {
  color: var(--marble-red);
  border-bottom: 1px solid rgba(123, 31, 44, 0.4);
  padding-bottom: 2px;
  transition: color var(--transition), border-color var(--transition);
}
.doc-meta-print:hover {
  color: var(--marble-red-dark);
  border-bottom-color: var(--marble-red);
}

/* ----- TABLE OF CONTENTS ----- */
.doc-toc {
  background: var(--olympus-stone);
  border-left: 3px solid var(--marble-red);
  padding: 28px 32px;
  margin-bottom: 64px;
}
.doc-toc-label {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--ink-soft);
  margin-bottom: 18px;
}
.doc-toc-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 36px;
}
.doc-toc-list li {
  font-family: var(--serif);
  font-size: 14px;
  line-height: 1.5;
}
.doc-toc-list a {
  color: var(--ink);
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 4px 0;
  transition: color var(--transition);
}
.doc-toc-list a:hover { color: var(--marble-red); }
.doc-toc-list .num {
  font-family: var(--serif);
  color: var(--marble-red);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
  letter-spacing: 0.02em;
}

/* ----- SECTIONS ----- */
.doc-sections {
  display: flex;
  flex-direction: column;
}
.doc-sec {
  padding-bottom: 56px;
  margin-bottom: 56px;
  border-bottom: 1px solid var(--rule);
}
.doc-sec:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.doc-sec-header {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 22px;
  align-items: baseline;
  margin-bottom: 32px;
}
.doc-sec-num {
  font-family: var(--serif);
  font-size: 22px;
  color: var(--marble-red);
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
.doc-sec-h2 {
  font-family: var(--serif);
  font-size: clamp(28px, 3.2vw, 36px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink);
  font-weight: 400;
}
.doc-sec-h2 em {
  font-style: italic;
  color: var(--marble-red);
}

.doc-sec-body {
  padding-left: 86px;
}
.doc-sec-body > p {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  margin-bottom: 18px;
  max-width: 620px;
}
.doc-sec-body > p:last-child { margin-bottom: 0; }
.doc-sec-body p strong {
  color: var(--ink);
  font-weight: 600;
}
.doc-sec-body p em {
  font-style: italic;
  color: var(--marble-red);
}
.doc-sec-body a {
  color: var(--marble-red);
  border-bottom: 1px solid rgba(123, 31, 44, 0.4);
  transition: color var(--transition), border-color var(--transition);
}
.doc-sec-body a:hover {
  color: var(--marble-red-dark);
  border-bottom-color: var(--marble-red);
}

/* Sub-headings */
.doc-sec-body h3 {
  font-family: var(--serif);
  font-size: 22px;
  line-height: 1.25;
  color: var(--ink);
  font-weight: 400;
  letter-spacing: -0.005em;
  margin: 36px 0 14px;
  max-width: 620px;
}
.doc-sec-body h3 em {
  font-style: italic;
  color: var(--marble-red);
}

/* Lists */
.doc-sec-body ul,
.doc-sec-body ol {
  font-family: var(--serif);
  margin: 0 0 18px;
  padding: 0 0 0 26px;
  max-width: 620px;
}
.doc-sec-body ul li,
.doc-sec-body ol li {
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink);
  margin-bottom: 8px;
  padding-left: 6px;
}
.doc-sec-body ul li::marker { color: var(--marble-red); }
.doc-sec-body ol li::marker {
  color: var(--marble-red);
  font-style: italic;
}
.doc-sec-body li strong { font-weight: 600; }

/* Definition list — for "key terms" sections */
.doc-sec-body dl {
  margin: 0 0 24px;
  max-width: 620px;
}
.doc-sec-body dt {
  font-family: var(--serif);
  font-size: 15px;
  font-style: italic;
  color: var(--ink);
  margin-top: 18px;
  margin-bottom: 4px;
}
.doc-sec-body dt:first-child { margin-top: 0; }
.doc-sec-body dd {
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin-left: 0;
  padding-left: 22px;
  border-left: 1px solid var(--rule);
}

/* ----- DATA ROWS (label / value pairs) ----- */
.doc-rows {
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  margin: 24px 0;
  max-width: 620px;
}
.doc-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
}
.doc-row:last-child { border-bottom: none; }
.doc-row-label {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--marble-red);
}
.doc-row-value {
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
}

/* ----- CALLOUT ----- */
.doc-callout {
  background: var(--olympus-stone);
  border-left: 3px solid var(--marble-red);
  padding: 20px 28px;
  margin: 24px 0;
  max-width: 620px;
}
.doc-callout-label {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 10px;
}
.doc-callout-body {
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink);
}
.doc-callout-body strong {
  color: var(--ink);
  font-weight: 600;
}
.doc-callout-body em {
  font-style: italic;
  color: var(--marble-red);
}

/* ----- TABLES ----- */
.doc-table-wrap {
  margin: 24px 0 28px;
  overflow-x: auto;
  max-width: 620px;
}
.doc-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.55;
}
.doc-table caption {
  text-align: left;
  font-family: var(--serif);
  font-style: italic;
  font-size: 13px;
  color: var(--marble-red);
  letter-spacing: 0.02em;
  padding-bottom: 12px;
}
.doc-table th {
  text-align: left;
  font-weight: 600;
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
  padding: 12px 16px 10px 0;
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.doc-table td {
  padding: 12px 16px 12px 0;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}
.doc-table td:first-child {
  font-weight: 500;
  font-family: var(--serif);
  font-size: 15px;
}
.doc-table td:nth-child(2) {
  white-space: nowrap;
  font-family: var(--serif);
  font-size: 15px;
}
.doc-table td:nth-child(3) {
  color: var(--ink-soft);
  font-size: 13px;
}
.doc-table tr:last-child td {
  border-bottom: none;
}
.doc-table tfoot td {
  font-weight: 600;
  border-top: 1px solid var(--ink);
  border-bottom: none;
  padding-top: 16px;
}
.doc-table tfoot td:first-child {
  font-style: italic;
}

/* ----- CONTACT BLOCK ----- */
.doc-contact {
  background: #FFFFFF;
  border: 1px solid var(--rule);
  padding: 32px 36px;
  margin: 40px 0 0;
  max-width: 620px;
}
.doc-contact-label {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--marble-red);
  margin-bottom: 14px;
}
.doc-contact-h3 {
  font-family: var(--serif);
  font-size: 24px;
  line-height: 1.2;
  color: var(--ink);
  font-weight: 400;
  letter-spacing: -0.005em;
  margin-bottom: 20px;
}
.doc-contact-h3 em {
  font-style: italic;
  color: var(--marble-red);
}
.doc-contact-rows {
  display: flex;
  flex-direction: column;
}
.doc-contact-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
}
.doc-contact-row:last-child { border-bottom: none; }
.doc-contact-row .label {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--marble-red);
}
.doc-contact-row .value {
  font-family: var(--serif);
  font-size: 15px;
  color: var(--ink);
}
.doc-contact-row .value a {
  color: var(--marble-red);
  border-bottom: 1px solid rgba(123, 31, 44, 0.4);
  transition: color var(--transition), border-color var(--transition);
}
.doc-contact-row .value a:hover {
  color: var(--marble-red-dark);
  border-bottom-color: var(--marble-red);
}

/* ----- BACK TO TOP ----- */
.doc-totop {
  margin-top: 64px;
  padding-top: 28px;
  border-top: 1px solid var(--rule);
  text-align: center;
}
.doc-totop a {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--marble-red);
  border-bottom: 1px solid rgba(123, 31, 44, 0.4);
  padding-bottom: 3px;
  transition: color var(--transition), border-color var(--transition);
}
.doc-totop a:hover {
  color: var(--marble-red-dark);
  border-bottom-color: var(--marble-red);
}

/* ============================================================
   STUB FOOTER
   ============================================================ */
.site-footer {
  background: var(--deep-sea);
  color: var(--off-white);
  padding: 48px 0 32px;
  margin-top: 40px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 32px;
  flex-wrap: wrap;
}
.footer-brand {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.3;
  color: var(--off-white);
}
.footer-brand .dot { color: var(--marble-red); }
.footer-meta {
  font-family: var(--sans);
  font-size: 12px;
  color: rgba(247, 243, 236, 0.6);
  letter-spacing: 0.02em;
  max-width: 360px;
  line-height: 1.5;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 760px) {
  .wrap { padding: 0 24px; }
  .nav-primary { display: none; }

  .doc-section { padding: 110px 0 80px; }

  .doc-hero {
    padding-bottom: 36px;
    margin-bottom: 40px;
  }
  .doc-h1 {
    font-size: clamp(32px, 9vw, 44px);
  }
  .doc-lede { font-size: 17px; }
  .doc-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .doc-toc-list {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .doc-toc { padding: 24px 26px; }

  .doc-sec-header {
    grid-template-columns: 44px 1fr;
    gap: 14px;
    margin-bottom: 24px;
  }
  .doc-sec-num { font-size: 18px; }
  .doc-sec-h2 { font-size: clamp(24px, 6vw, 30px); }
  .doc-sec-body { padding-left: 0; }

  .doc-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .doc-contact { padding: 26px 24px; }
  .doc-contact-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .doc-table th { font-size: 11px; }
  .doc-table td:first-child,
  .doc-table td:nth-child(2) { font-size: 14px; }
}

@media (max-width: 480px) {
  .doc-section { padding: 100px 0 64px; }
  .doc-h1 { font-size: 30px; }
  .doc-sec-h2 { font-size: 24px; }
}

/* ============================================================
   PRINT
   ============================================================ */
@media print {
  .site-nav, .site-footer, .doc-meta-print, .doc-totop { display: none; }
  .doc-section { padding: 0; background: #fff; }
  .doc-callout, .doc-contact { background: #f9f7f1; }
  .doc-toc { page-break-after: always; }
  .doc-sec { page-break-inside: avoid; }
}