/* Art direction: Australian English informational template -> clean editorial restraint
   Palette: warm neutral surfaces with restrained teal accent
   Typography: Boska + General Sans for elegant hierarchy and highly readable body copy
   Density: balanced with generous rhythm for long-form content */

:root,
[data-theme="light"] {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  --color-bg: #f7f6f2;
  --color-surface: #f9f8f5;
  --color-surface-2: #fbfbf9;
  --color-surface-offset: #efede8;
  --color-divider: #dedbd4;
  --color-border: #d4d1ca;
  --color-text: #28251d;
  --color-text-muted: #65635d;
  --color-text-faint: #8f8c86;
  --color-text-inverse: #f9f8f4;
  --color-primary: #01696f;
  --color-primary-hover: #0c4e54;
  --color-primary-active: #0f3638;
  --color-primary-soft: color-mix(in oklab, var(--color-primary) 9%, var(--color-surface));
  --color-overlay: oklch(from var(--color-bg) l c h / 0.78);

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px oklch(0.2 0.01 80 / 0.05);
  --shadow-md: 0 8px 24px oklch(0.2 0.01 80 / 0.08);

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --font-display: 'Boska', Georgia, serif;
  --font-body: 'General Sans', 'Inter', sans-serif;
  --content-narrow: 46rem;
  --content-default: 72rem;
}

[data-theme="dark"] {
  --color-bg: #171614;
  --color-surface: #1c1b19;
  --color-surface-2: #201f1d;
  --color-surface-offset: #262421;
  --color-divider: #2a2927;
  --color-border: #393836;
  --color-text: #d6d3cc;
  --color-text-muted: #b3aea6;
  --color-text-faint: #8b867f;
  --color-text-inverse: #1c1b19;
  --color-primary: #5ca2ac;
  --color-primary-hover: #77b7bf;
  --color-primary-active: #42868f;
  --color-primary-soft: color-mix(in oklab, var(--color-primary) 12%, var(--color-surface));
  --color-overlay: oklch(from var(--color-bg) l c h / 0.84);
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
  --shadow-md: 0 12px 32px oklch(0 0 0 / 0.3);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #171614;
    --color-surface: #1c1b19;
    --color-surface-2: #201f1d;
    --color-surface-offset: #262421;
    --color-divider: #2a2927;
    --color-border: #393836;
    --color-text: #d6d3cc;
    --color-text-muted: #b3aea6;
    --color-text-faint: #8b867f;
    --color-text-inverse: #1c1b19;
    --color-primary: #5ca2ac;
    --color-primary-hover: #77b7bf;
    --color-primary-active: #42868f;
    --color-primary-soft: color-mix(in oklab, var(--color-primary) 12%, var(--color-surface));
    --color-overlay: oklch(from var(--color-bg) l c h / 0.84);
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
    --shadow-md: 0 12px 32px oklch(0 0 0 / 0.3);
  }
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -moz-text-size-adjust: none;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}
body {
  min-height: 100dvh;
  line-height: 1.7;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background:
    linear-gradient(to bottom, color-mix(in oklab, var(--color-bg) 92%, white) 0%, var(--color-bg) 14rem, var(--color-bg) 100%);
}
img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
input, button, textarea, select { font: inherit; color: inherit; }
a {
  color: var(--color-primary);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.16em;
}
a, button, input, textarea, select {
  transition: color var(--transition-interactive), background var(--transition-interactive), border-color var(--transition-interactive), box-shadow var(--transition-interactive), opacity var(--transition-interactive);
}
button { cursor: pointer; background: none; border: none; }
table { border-collapse: collapse; width: 100%; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 500; letter-spacing: -0.02em; line-height: 1.1; text-wrap: balance; }
p, li, figcaption { text-wrap: pretty; }
::selection {
  background: color-mix(in oklab, var(--color-primary) 24%, transparent);
  color: var(--color-text);
}
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: var(--space-4);
  transform: translateY(-160%);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-full);
  background: var(--color-text);
  color: var(--color-text-inverse);
  z-index: 200;
  box-shadow: var(--shadow-md);
}
.skip-link:focus-visible { transform: translateY(0); }

.shell {
  width: min(calc(100% - var(--space-8)), var(--content-default));
  margin-inline: auto;
}
.shell--narrow { width: min(calc(100% - var(--space-8)), var(--content-narrow)); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  background: var(--color-overlay);
  border-bottom: 1px solid color-mix(in oklab, var(--color-text) 10%, transparent);
}
.site-header.is-scrolled { box-shadow: var(--shadow-sm); }
.header-shell {
  min-height: 4.75rem;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: var(--space-4);
  padding-block: var(--space-3);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
  text-decoration: none;
  min-height: 44px;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
}
.brand-mark {
  width: 2.5rem;
  height: 2.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-primary-soft);
  color: var(--color-primary);
}
.brand-mark svg { width: 1.5rem; height: 1.5rem; }
.brand-text { text-transform: lowercase; }

.header-actions {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}
.theme-toggle,
.menu-toggle {
  min-width: 44px;
  min-height: 44px;
  border: 1px solid color-mix(in oklab, var(--color-text) 10%, transparent);
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in oklab, var(--color-surface) 88%, transparent);
}
.theme-toggle:hover,
.menu-toggle:hover,
.theme-toggle:focus-visible,
.menu-toggle:focus-visible {
  background: var(--color-surface-2);
  border-color: color-mix(in oklab, var(--color-text) 16%, transparent);
}
.theme-toggle svg {
  width: 1.15rem;
  height: 1.15rem;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.theme-icon-moon { display: none; }
[data-theme="dark"] .theme-icon-sun { display: none; }
[data-theme="dark"] .theme-icon-moon { display: block; }

.menu-toggle-box {
  width: 1.2rem;
  display: grid;
  gap: 0.24rem;
}
.menu-toggle-box span {
  display: block;
  height: 2px;
  border-radius: var(--radius-full);
  background: currentColor;
  transform-origin: center;
  transition: transform var(--transition-interactive), opacity var(--transition-interactive);
}
.menu-toggle[aria-expanded="true"] .menu-toggle-box span:nth-child(1) { transform: translateY(0.38rem) rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-toggle-box span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] .menu-toggle-box span:nth-child(3) { transform: translateY(-0.38rem) rotate(-45deg); }

.site-nav {
  grid-column: 1 / -1;
  display: none;
  padding-bottom: var(--space-3);
}
.site-nav.is-open { display: block; }
.nav-list {
  list-style: none;
  display: grid;
  gap: var(--space-2);
}
.nav-list a {
  display: block;
  min-height: 44px;
  padding: var(--space-3) 0;
  color: var(--color-text);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in oklab, var(--color-text) 10%, transparent);
}
.nav-list a:hover,
.nav-list a:focus-visible { color: var(--color-primary); }

.site-main {
  padding-block: clamp(var(--space-10), 7vw, var(--space-20));
}
.content-section {
  padding-block: clamp(var(--space-8), 5vw, var(--space-12));
}
.page-intro {
  display: grid;
  gap: var(--space-4);
  padding-bottom: clamp(var(--space-8), 6vw, var(--space-12));
  border-bottom: 1px solid color-mix(in oklab, var(--color-text) 10%, transparent);
  margin-bottom: clamp(var(--space-8), 6vw, var(--space-12));
}
.eyebrow {
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  font-weight: 600;
}
.page-intro h1 { font-size: var(--text-2xl); }
.intro-note {
  max-width: 62ch;
  color: var(--color-text-muted);
}

.content-flow {
  display: grid;
  gap: var(--space-5);
  min-height: 12rem;
  content-visibility: auto;
}
.content-flow:empty::before {
  content: "Paste your main content here.";
  display: inline-block;
  width: fit-content;
  padding: var(--space-3) 0;
  color: var(--color-text-faint);
  font-size: var(--text-sm);
}
.content-flow > * + * { margin-top: 0; }
.content-flow :where(h1, h2, h3, h4, p, ul, ol, blockquote, figure, table, hr, details, .button-row) + :where(h2, h3, h4, p, ul, ol, blockquote, figure, table, hr, details, .button-row) {
  margin-top: var(--space-5);
}
.content-flow :where(h1) {
  font-size: var(--text-2xl);
  margin-top: 0;
}
.content-flow :where(h2) {
  font-size: var(--text-xl);
  padding-top: var(--space-4);
}
.content-flow :where(h3) {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: -0.01em;
}
.content-flow :where(h4) {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 700;
  letter-spacing: 0;
}
.content-flow :where(p, ul, ol, blockquote, table, details, figure, hr) {
  max-width: 65ch;
}
.content-flow :where(p, li) { color: var(--color-text); }
.content-flow :where(ul, ol) {
  padding-left: 1.25em;
  display: grid;
  gap: var(--space-2);
}
.content-flow :where(li > ul, li > ol) { margin-top: var(--space-2); }
.content-flow :where(strong) { font-weight: 700; }
.content-flow :where(em) { font-style: italic; }
.content-flow :where(a:hover, a:focus-visible) { color: var(--color-primary-hover); }
.content-flow :where(blockquote) {
  padding: var(--space-4) 0 var(--space-4) var(--space-5);
  border-left: 2px solid var(--color-primary);
  color: var(--color-text-muted);
  font-size: var(--text-lg);
}
.content-flow :where(figure) {
  display: grid;
  gap: var(--space-3);
  width: 100%;
}
.content-flow :where(img) {
  width: 100%;
  border-radius: var(--radius-lg);
  background: var(--color-surface-offset);
}
.content-flow :where(figcaption) {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.content-flow :where(table) {
  display: table;
  width: 100%;
  max-width: 100%;
  overflow: hidden;
  margin-inline: 0;
  background: color-mix(in oklab, var(--color-surface) 92%, transparent);
  border: 1px solid color-mix(in oklab, var(--color-text) 10%, transparent);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.content-flow :where(thead) {
  background: color-mix(in oklab, var(--color-primary) 8%, var(--color-surface-2));
}
.content-flow :where(tbody tr:nth-child(even)) {
  background: color-mix(in oklab, var(--color-surface-offset) 68%, transparent);
}
.content-flow :where(tbody tr:hover) {
  background: color-mix(in oklab, var(--color-primary) 6%, var(--color-surface));
}
.content-flow :where(th, td) {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid color-mix(in oklab, var(--color-text) 8%, transparent);
}
.content-flow :where(th) {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
}
.content-flow :where(td) {
  color: var(--color-text-muted);
}
.content-flow :where(tr:last-child td) {
  border-bottom: 0;
}
.content-flow :where(table caption) {
  caption-side: top;
  text-align: left;
  padding-bottom: var(--space-3);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
}
.content-flow :where(.table-wrap) {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: var(--space-2);
}
.content-flow :where(.table-wrap table) {
  min-width: 36rem;
}
.content-flow :where(hr) {
  border: 0;
  border-top: 1px solid var(--color-divider);
}
.content-flow :where(details) {
  padding-block: var(--space-2);
  border-top: 1px solid color-mix(in oklab, var(--color-text) 10%, transparent);
}
.content-flow :where(details:last-of-type) {
  border-bottom: 1px solid color-mix(in oklab, var(--color-text) 10%, transparent);
}
.content-flow :where(summary) {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 44px;
  font-weight: 600;
}
.content-flow :where(summary::-webkit-details-marker) { display: none; }
.content-flow :where(summary::after) {
  content: "+";
  color: var(--color-primary);
  font-size: 1.4em;
  line-height: 1;
}
.content-flow :where(details[open] summary::after) { content: "−"; }
.content-flow :where(details > *:not(summary)) {
  margin-top: var(--space-3);
}
.content-flow :where(button, .button, a.button) {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.82rem 1.2rem;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 600;
}
.content-flow :where(button:hover, .button:hover, a.button:hover, button:focus-visible, .button:focus-visible, a.button:focus-visible) {
  background: var(--color-primary-hover);
  color: var(--color-text-inverse);
}
.content-flow :where(.button-row) {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}
.content-flow :where(.link-inline) {
  display: inline;
  min-height: auto;
  padding: 0;
  border-radius: 0;
  border: 0;
  background: none;
  color: var(--color-primary);
}

.site-footer {
  border-top: 1px solid color-mix(in oklab, var(--color-text) 10%, transparent);
  padding-block: var(--space-6) var(--space-10);
}
.footer-shell {
  display: grid;
  gap: var(--space-4);
}
.footer-brand {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.footer-nav a {
  color: var(--color-text-muted);
  text-decoration: none;
}
.footer-nav a:hover,
.footer-nav a:focus-visible { color: var(--color-primary); }

@media (min-width: 48rem) {
  .header-shell {
    grid-template-columns: auto 1fr auto;
    gap: var(--space-6);
  }
  .header-actions {
    order: 3;
  }
  .menu-toggle { display: none; }
  .site-nav {
    grid-column: auto;
    display: block;
    padding-bottom: 0;
  }
  .nav-list {
    display: flex;
    justify-content: center;
    gap: var(--space-6);
  }
  .nav-list a {
    border-bottom: 0;
    padding: var(--space-2) 0;
  }
  .footer-shell {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
}

@media (max-width: 30rem) {
  .shell,
  .shell--narrow {
    width: min(calc(100% - var(--space-6)), var(--content-default));
  }
  .content-flow :where(table) {
    font-size: var(--text-sm);
  }
}

@media (max-width: 40rem) {
  .content-flow :where(table) {
    font-size: var(--text-sm);
  }
  .content-flow :where(th, td) {
    padding: var(--space-3);
  }
  .content-flow :where(.table-wrap table) {
    min-width: 32rem;
  }
}