/* Tidewater Sciences LLC -- shared stylesheet
   Web-safe font stacks only. No external resources. */

:root {
  --color-ink: #1B2B3A;
  --color-ink-soft: #3A4A58;
  --color-primary: #1D4E5F;
  --color-primary-dark: #163C4A;
  --color-accent: #8C3A2B;
  --color-surface: #F7F6F4;
  --color-surface-raised: #FFFFFF;
  --color-border: #D7D3CA;
  --color-border-strong: #B7B2A6;
  --color-text: #1B2B3A;
  --color-text-muted: #4E5B63;
  --color-text-on-dark: #F2F1ED;
  --color-link: #1D4E5F;
  --color-link-visited: #163C4A;
  --color-focus: #8C3A2B;
  --color-masthead-bg: #1B2B3A;
  --color-masthead-text: #F2F1ED;
  --color-masthead-text-muted: #B9C4CA;
  --color-footer-bg: #17242F;
  --color-footer-text: #C9D0D4;
  --color-table-stripe: #EFEDE7;
  --color-notice-bg: #F1E4DC;
  --color-notice-border: #8C3A2B;
  --color-notice-text: #5C2419;
  --shadow-card: 0 1px 3px rgba(27, 43, 58, 0.12);

  --font-heading: "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
  --font-body: Verdana, Tahoma, Geneva, sans-serif;
  --font-data: Consolas, "Courier New", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-ink: #E6E8EA;
    --color-ink-soft: #C7CDD1;
    --color-primary: #6FA8B8;
    --color-primary-dark: #8DC0CE;
    --color-accent: #D08066;
    --color-surface: #131C22;
    --color-surface-raised: #1A252C;
    --color-border: #33424B;
    --color-border-strong: #45565F;
    --color-text: #E6E8EA;
    --color-text-muted: #A7B2B8;
    --color-link: #8DC0CE;
    --color-link-visited: #A9CDD8;
    --color-focus: #D08066;
    --color-masthead-bg: #0D1418;
    --color-masthead-text: #E6E8EA;
    --color-masthead-text-muted: #8D9AA1;
    --color-footer-bg: #0A1013;
    --color-footer-text: #93A0A6;
    --color-table-stripe: #1D2932;
    --color-notice-bg: #2A1A15;
    --color-notice-border: #D08066;
    --color-notice-text: #E7BBA9;
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.4);
  }
}

:root[data-theme="dark"] {
  --color-ink: #E6E8EA;
  --color-ink-soft: #C7CDD1;
  --color-primary: #6FA8B8;
  --color-primary-dark: #8DC0CE;
  --color-accent: #D08066;
  --color-surface: #131C22;
  --color-surface-raised: #1A252C;
  --color-border: #33424B;
  --color-border-strong: #45565F;
  --color-text: #E6E8EA;
  --color-text-muted: #A7B2B8;
  --color-link: #8DC0CE;
  --color-link-visited: #A9CDD8;
  --color-focus: #D08066;
  --color-masthead-bg: #0D1418;
  --color-masthead-text: #E6E8EA;
  --color-masthead-text-muted: #8D9AA1;
  --color-footer-bg: #0A1013;
  --color-footer-text: #93A0A6;
  --color-table-stripe: #1D2932;
  --color-notice-bg: #2A1A15;
  --color-notice-border: #D08066;
  --color-notice-text: #E7BBA9;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.4);
}

:root[data-theme="light"] {
  --color-ink: #1B2B3A;
  --color-ink-soft: #3A4A58;
  --color-primary: #1D4E5F;
  --color-primary-dark: #163C4A;
  --color-accent: #8C3A2B;
  --color-surface: #F7F6F4;
  --color-surface-raised: #FFFFFF;
  --color-border: #D7D3CA;
  --color-border-strong: #B7B2A6;
  --color-text: #1B2B3A;
  --color-text-muted: #4E5B63;
  --color-link: #1D4E5F;
  --color-link-visited: #163C4A;
  --color-focus: #8C3A2B;
  --color-masthead-bg: #1B2B3A;
  --color-masthead-text: #F2F1ED;
  --color-masthead-text-muted: #B9C4CA;
  --color-footer-bg: #17242F;
  --color-footer-text: #C9D0D4;
  --color-table-stripe: #EFEDE7;
  --color-notice-bg: #F1E4DC;
  --color-notice-border: #8C3A2B;
  --color-notice-text: #5C2419;
  --shadow-card: 0 1px 3px rgba(27, 43, 58, 0.12);
}

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

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  padding: 0;
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
}

img, svg { max-width: 100%; height: auto; }

a {
  color: var(--color-link);
}

a:visited {
  color: var(--color-link-visited);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--color-ink);
  line-height: 1.25;
  font-weight: normal;
}

h1 { font-size: 2rem; margin: 0 0 0.6em; }
h2 { font-size: 1.5rem; margin: 1.6em 0 0.6em; }
h3 { font-size: 1.2rem; margin: 1.4em 0 0.5em; }

p { margin: 0 0 1.1em; max-width: 68ch; }

ul, ol { margin: 0 0 1.1em; padding-left: 1.4em; max-width: 66ch; }
li { margin-bottom: 0.4em; }

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- Draft notice ---------- */

.draft-notice {
  background: var(--color-notice-bg);
  color: var(--color-notice-text);
  border-bottom: 1px solid var(--color-notice-border);
  font-family: var(--font-data);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  text-align: center;
  padding: 0.45rem 1rem;
  /* override the global p max-width so the bar spans the viewport */
  max-width: none;
  margin: 0;
}

/* ---------- Masthead ---------- */

.masthead {
  background: var(--color-masthead-bg);
  color: var(--color-masthead-text);
  border-bottom: 3px solid var(--color-accent);
}

.masthead-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  padding: 1.1rem 0 0.7rem;
}

.masthead-brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
}

.masthead-brand:visited { color: inherit; }

.masthead-mark {
  flex: none;
  display: block;
}

.masthead-mark .mk-line { stroke: var(--color-masthead-text-muted); }
.masthead-mark .mk-line-strong { stroke: var(--color-masthead-text); }
.masthead-mark .mk-tick { stroke: var(--color-accent); }
.masthead-mark rect { stroke: var(--color-masthead-text-muted); }

/* Inline diagram utility classes: theme-aware SVG illustrations */
.diagram-ink { stroke: var(--color-ink); }
.diagram-ink-soft { stroke: var(--color-ink-soft); }
.diagram-accent { stroke: var(--color-accent); }
.diagram-accent-fill { fill: var(--color-accent); }
.diagram-primary { stroke: var(--color-primary); }
.diagram-surface { fill: var(--color-surface); }
.diagram-surface-raised { fill: var(--color-surface-raised); }
.diagram-text { fill: var(--color-text-muted); font-family: var(--font-data); }

.masthead-name {
  font-family: var(--font-heading);
  color: var(--color-masthead-text);
  font-size: 1.5rem;
  letter-spacing: 0.01em;
}

.masthead-sub {
  display: block;
  font-family: var(--font-body);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--color-masthead-text-muted);
  margin-top: 0.15rem;
}

.masthead-contact {
  font-family: var(--font-data);
  font-size: 0.88rem;
  color: var(--color-masthead-text-muted);
  text-align: right;
}

.masthead-contact a { color: var(--color-masthead-text-muted); text-decoration: none; }
.masthead-contact a:hover { color: var(--color-masthead-text); text-decoration: underline; }

.primary-nav {
  border-top: 1px solid rgba(255,255,255,0.14);
}

.primary-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
}

.primary-nav a {
  display: block;
  padding: 0.8rem 1rem;
  color: var(--color-masthead-text-muted);
  text-decoration: none;
  font-size: 0.92rem;
  border-bottom: 3px solid transparent;
}

.primary-nav a:visited { color: var(--color-masthead-text-muted); }

.primary-nav a:hover {
  color: var(--color-masthead-text);
  border-bottom-color: rgba(255,255,255,0.35);
}

.primary-nav a[aria-current="page"] {
  color: var(--color-masthead-text);
  border-bottom-color: var(--color-accent);
  font-weight: bold;
}

.nav-toggle {
  display: none;
}

/* ---------- Hero (home only) ---------- */

.hero {
  background: var(--color-surface-raised);
  border-bottom: 1px solid var(--color-border);
}

.hero-inner {
  padding: 3rem 0 2.6rem;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 2.5rem;
  align-items: center;
}

.hero h1 {
  font-size: 2.35rem;
  max-width: 16ch;
}

.hero-lede {
  font-size: 1.12rem;
  color: var(--color-text-muted);
  max-width: 46ch;
}

.hero-actions {
  margin-top: 1.4rem;
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.hero-figure {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: 1rem;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 0.65rem 1.3rem;
  text-decoration: none;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}

.btn:visited { color: var(--color-primary); }

.btn:hover {
  background: var(--color-primary);
  color: var(--color-text-on-dark);
}

.btn-solid {
  background: var(--color-primary);
  color: var(--color-text-on-dark);
  border-color: var(--color-primary);
}

.btn-solid:visited { color: var(--color-text-on-dark); }

.btn-solid:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

/* ---------- Page layout: sidebar + main ---------- */

.page-body {
  padding: 2.4rem 0 3.5rem;
}

.layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 2.6rem;
  align-items: start;
}

.sidebar {
  position: sticky;
  top: 1.2rem;
  border: 1px solid var(--color-border);
  background: var(--color-surface-raised);
  padding: 1.2rem 1.3rem 1.4rem;
}

.sidebar h2 {
  font-size: 0.95rem;
  margin: 0 0 0.7rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.sidebar ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar li { margin: 0; }

.sidebar a {
  display: block;
  padding: 0.42rem 0;
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: 0.93rem;
  border-bottom: 1px dotted var(--color-border);
}

.sidebar li:last-child a { border-bottom: none; }

.sidebar a:visited { color: var(--color-text-muted); }

.sidebar a:hover {
  color: var(--color-primary);
}

.sidebar a[aria-current="true"] {
  color: var(--color-primary);
  font-weight: bold;
}

.sidebar-note {
  margin-top: 1.1rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.sidebar-note p { margin-bottom: 0.6em; }

.content h1 {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.7rem;
  margin-bottom: 0.5rem;
}

.content .page-intro {
  font-size: 1.06rem;
  color: var(--color-text-muted);
  max-width: 62ch;
  margin-bottom: 1.8rem;
}

.content section {
  margin-bottom: 2.2rem;
}

.content section:target {
  scroll-margin-top: 1rem;
}

/* ---------- Pull quote / callout ---------- */

.callout {
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  padding: 1rem 1.3rem;
  margin: 1.6rem 0;
  max-width: 62ch;
}

.callout p:last-child { margin-bottom: 0; }

.callout-accent {
  border-left-color: var(--color-accent);
}

/* ---------- Tables ---------- */

.table-wrap {
  overflow-x: auto;
  margin: 1.2rem 0 1.8rem;
  border: 1px solid var(--color-border);
}

table {
  border-collapse: collapse;
  width: 100%;
  min-width: 560px;
  font-size: 0.92rem;
}

caption {
  text-align: left;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  padding: 0.6rem 0.8rem 0;
  caption-side: top;
}

th, td {
  text-align: left;
  padding: 0.55rem 0.8rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

thead th {
  background: var(--color-ink);
  color: var(--color-text-on-dark);
  font-family: var(--font-body);
  font-weight: bold;
  font-size: 0.85rem;
}

tbody tr:nth-child(even) {
  background: var(--color-table-stripe);
}

td.data, th.data {
  font-family: var(--font-data);
  font-size: 0.87rem;
}

/* ---------- Definition-style list ---------- */

.term-list dt {
  font-family: var(--font-heading);
  color: var(--color-ink);
  margin-top: 1.1rem;
}

.term-list dd {
  margin: 0.25rem 0 0;
  color: var(--color-text-muted);
  max-width: 62ch;
}

/* ---------- Sector / service list blocks (no icon triptychs) ---------- */

.entry-block {
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 0;
}

.entry-block:first-of-type {
  border-top: none;
  padding-top: 0;
}

.entry-block h3 {
  margin-top: 0;
}

.entry-meta {
  font-family: var(--font-data);
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin: -0.3rem 0 0.6rem;
}

/* ---------- Home page sections ---------- */

.home-intro {
  padding: 2.6rem 0;
}

.home-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.6rem;
  margin-top: 1.6rem;
}

.home-card {
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  padding: 1.3rem 1.4rem;
}

.home-card h3 {
  margin-top: 0;
  font-size: 1.08rem;
}

.home-card h3 a {
  text-decoration: none;
  color: var(--color-ink);
}

.home-card h3 a:hover { color: var(--color-primary); }

.home-card p {
  color: var(--color-text-muted);
  font-size: 0.94rem;
  margin-bottom: 0;
}

.band {
  padding: 2.4rem 0;
  border-top: 1px solid var(--color-border);
}

.band-alt {
  background: var(--color-surface-raised);
}

.band-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.6rem;
}

/* ---------- Contact form ---------- */

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.1rem 1.4rem;
  max-width: 640px;
}

.form-field {
  display: flex;
  flex-direction: column;
}

.form-field.full { grid-column: 1 / -1; }

.form-field label {
  font-size: 0.86rem;
  color: var(--color-ink);
  margin-bottom: 0.35rem;
}

.form-field .req { color: var(--color-accent); }

.form-field input,
.form-field select,
.form-field textarea {
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface-raised);
  color: var(--color-text);
}

.form-field textarea {
  resize: vertical;
  min-height: 7rem;
}

.form-actions {
  grid-column: 1 / -1;
  margin-top: 0.4rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.form-note {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.contact-methods {
  list-style: none;
  margin: 0 0 1.6rem;
  padding: 0;
}

.contact-methods li {
  margin-bottom: 0.7rem;
  padding-left: 0;
}

.contact-methods .label {
  display: block;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  text-transform: none;
}

.contact-methods .value {
  font-family: var(--font-data);
  font-size: 0.98rem;
}

/* ---------- Footer ---------- */

.site-footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  border-top: 3px solid var(--color-accent);
}

.footer-inner {
  padding: 2.4rem 0 1.6rem;
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 2rem;
}

.footer-inner h2 {
  color: var(--color-text-on-dark);
  font-size: 1.1rem;
  margin: 0 0 0.5rem;
}

.footer-inner p {
  color: var(--color-footer-text);
  font-size: 0.9rem;
  max-width: none;
}

.footer-inner ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-inner a {
  color: var(--color-footer-text);
  font-size: 0.9rem;
  text-decoration: none;
}

.footer-inner a:visited { color: var(--color-footer-text); }

.footer-inner a:hover { color: var(--color-text-on-dark); text-decoration: underline; }

.footer-address {
  font-style: normal;
  font-family: var(--font-data);
  font-size: 0.85rem;
  line-height: 1.7;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding: 1rem 0 1.6rem;
  font-size: 0.78rem;
  color: var(--color-footer-text);
  opacity: 0.85;
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .home-grid { grid-template-columns: 1fr 1fr; }
  .band-two-col { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar {
    position: static;
    margin-bottom: 1.6rem;
  }
  .home-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .masthead-top { flex-direction: column; }
  .masthead-contact { text-align: left; }
  .primary-nav ul { flex-direction: column; }
  .primary-nav a { border-bottom: none; border-left: 3px solid transparent; padding: 0.7rem 0.2rem; }
  .primary-nav a:hover { border-left-color: rgba(255,255,255,0.35); border-bottom-color: transparent; }
  .primary-nav a[aria-current="page"] { border-left-color: var(--color-accent); border-bottom-color: transparent; }
  .form-grid { grid-template-columns: 1fr; }
}