/* ============================================================
   Watershed Modeling — Turquoise Waters palette
   ============================================================ */
:root {
  /* Palette */
  --color-turquoise-50:  #ECFEFF;
  --color-turquoise-100: #CFFAFE;
  --color-turquoise-200: #A5F3FC;
  --color-turquoise-300: #67E8F9;
  --color-turquoise-400: #22D3EE;
  --color-turquoise-500: #06B6D4;
  --color-turquoise-600: #0891B2;
  --color-turquoise-700: #0E7490;
  --color-teal-300:      #5EEAD4;
  --color-teal-400:      #2DD4BF;
  --color-teal-500:      #14B8A6;
  --color-teal-600:      #0D9488;
  --color-teal-700:      #0F766E;
  --color-aqua:          #0EA5A8;
  --color-foam:          #F0FDFA;

  --color-text:          #0F2F3D;
  --color-text-muted:    #4A6975;
  --color-text-soft:     #6B8995;
  --color-heading:       #0B3B49;
  --color-link:          #0891B2;
  --color-link-hover:    #0E7490;
  --color-bg:            #F7FDFE;
  --color-surface:       #FFFFFF;
  --color-surface-alt:   #F0F9FB;
  --color-border:        #BAE6FD;
  --color-border-soft:   #E0F2F7;
  --color-code-bg:       #F1FBFD;
  --color-code-inline:   #E6F8FC;
  --color-shadow:        rgba(14, 165, 168, 0.12);
  --color-shadow-strong: rgba(14, 165, 168, 0.22);

  /* Type */
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  /* Layout */
  --max-page: 1600px;
  --max-content: 1200px;
  --max-prose: 1100px;
  --header-height: 70px;
  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 18px;
  --radius-xl: 28px;

  /* Motion */
  --ease: cubic-bezier(.2,.7,.2,1);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  /* Sticky-header anchor offset so in-page links don't hide content. */
  scroll-padding-top: calc(var(--header-height) + 16px);
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

/* ----------------------- Header ----------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--color-border-soft);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.site-header__inner {
  width: 100%;
  max-width: var(--max-page);
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--color-heading);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.01em;
  transition: transform .2s var(--ease);
}
.brand:hover { transform: translateY(-1px); }
.brand__logo { width: 38px; height: 38px; flex: 0 0 38px; }
.brand__name { font-size: 18px; line-height: 1.1; }
.brand__name small { display: block; font-weight: 500; font-size: 12px; color: var(--color-text-soft); letter-spacing: 0; }

.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border-radius: 999px;
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  font-size: 14.5px;
  transition: background .2s var(--ease), color .2s var(--ease), transform .2s var(--ease);
}
.site-nav__link svg { width: 18px; height: 18px; }
.site-nav__link:hover {
  background: var(--color-turquoise-50);
  color: var(--color-teal-700);
  transform: translateY(-1px);
}
.site-nav__link.is-current {
  background: linear-gradient(120deg, var(--color-teal-400), var(--color-turquoise-500));
  color: #fff;
  box-shadow: 0 6px 18px var(--color-shadow-strong);
}
.site-nav__link.is-current:hover { color: #fff; }

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  padding: 8px;
  border-radius: 8px;
  color: var(--color-text);
  cursor: pointer;
}
.nav-toggle:hover { background: var(--color-turquoise-50); }
.nav-toggle svg { width: 24px; height: 24px; }

/* ----------------------- Main / Layout ----------------------- */
.main {
  flex: 1 0 auto;
  width: 100%;
}

.container {
  width: 100%;
  max-width: var(--max-page);
  margin: 0 auto;
  padding: 0 28px;
}

.content-wrap {
  width: 100%;
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 0 28px;
}

/* ----------------------- Hero ----------------------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 28px 96px;
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(94, 234, 212, .45), transparent 60%),
    radial-gradient(900px 500px at 10% 110%, rgba(34, 211, 238, .35), transparent 65%),
    linear-gradient(180deg, #F0FDFA 0%, #ECFEFF 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: -40% -10% auto auto;
  width: 720px;
  height: 720px;
  background: conic-gradient(from 200deg at 50% 50%,
    rgba(45, 212, 191, .25),
    rgba(34, 211, 238, .15),
    rgba(186, 230, 253, .25),
    rgba(45, 212, 191, .25));
  filter: blur(60px);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--max-content);
  margin: 0 auto;
}

.hero__eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--color-teal-700);
  background: rgba(255,255,255,.7);
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--color-turquoise-100);
}

.hero__title {
  font-size: clamp(2rem, 4.6vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 18px 0 14px;
  color: var(--color-heading);
}
.hero__title span {
  background: linear-gradient(120deg, #0E7490 0%, #14B8A6 45%, #22D3EE 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__lede {
  font-size: clamp(1.05rem, 1.5vw, 1.2rem);
  max-width: 820px;
  color: var(--color-text-muted);
  margin: 0 0 30px;
}

.hero__ctas {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
  margin-top: 30px;
}

.cta {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: #fff;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  color: var(--color-heading);
  text-decoration: none;
  box-shadow: 0 2px 10px var(--color-shadow);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
  position: relative;
  overflow: hidden;
}
.cta:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 30px var(--color-shadow-strong);
  border-color: var(--color-turquoise-200);
}
.cta__icon {
  width: 48px;
  height: 48px;
  flex: 0 0 48px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  color: #fff;
}
.cta__icon--dem  { background: linear-gradient(135deg, #5EEAD4, #0EA5A8); }
.cta__icon--flow { background: linear-gradient(135deg, #22D3EE, #0891B2); }
.cta__icon--basin{ background: linear-gradient(135deg, #2DD4BF, #06B6D4); }
.cta__icon svg { width: 26px; height: 26px; }
.cta__title { font-weight: 700; font-size: 16.5px; margin: 0 0 4px; color: var(--color-heading); }
.cta__desc  { font-size: 14px; color: var(--color-text-soft); line-height: 1.5; }

/* ----------------------- Homepage sections ----------------------- */
.home-section {
  padding: 64px 0 24px;
}
.home-section h2 {
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  letter-spacing: -0.01em;
  margin: 0 0 12px;
  color: var(--color-heading);
}
.home-section p {
  color: var(--color-text-muted);
  max-width: 920px;
  font-size: 1.05rem;
}

.section-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 22px;
  margin: 36px 0 12px;
}
.section-card {
  background: #fff;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  padding: 26px;
  text-decoration: none;
  color: inherit;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: 0 2px 10px var(--color-shadow);
  position: relative;
  overflow: hidden;
}
.section-card::after {
  content: "";
  position: absolute;
  inset: auto -30% -50% auto;
  width: 320px; height: 320px;
  background: radial-gradient(closest-side, rgba(94,234,212,.18), transparent 70%);
  pointer-events: none;
}
.section-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 36px var(--color-shadow-strong);
  border-color: var(--color-turquoise-200);
}
.section-card__icon { width: 52px; height: 52px; border-radius: 16px; display: grid; place-items: center; color: #fff; }
.section-card__icon svg { width: 28px; height: 28px; }
.section-card__icon.dem   { background: linear-gradient(135deg, #5EEAD4, #0EA5A8); }
.section-card__icon.flow  { background: linear-gradient(135deg, #22D3EE, #0891B2); }
.section-card__icon.basin { background: linear-gradient(135deg, #2DD4BF, #06B6D4); }

.section-card h3 {
  margin: 0;
  color: var(--color-heading);
  font-size: 1.2rem;
  letter-spacing: -0.01em;
}
.section-card p { margin: 0; color: var(--color-text-muted); font-size: .98rem; }
.section-card__more {
  margin-top: auto;
  font-weight: 600;
  color: var(--color-teal-700);
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.95rem;
}
.section-card__more svg { width: 16px; height: 16px; flex: 0 0 16px; }
.section-card:hover .section-card__more { color: var(--color-turquoise-700); }
.section-card:hover .section-card__more svg { transform: translateX(2px); transition: transform .2s var(--ease); }

/* ----------------------- Breadcrumbs ----------------------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 8px;
  align-items: center;
  margin: 28px 0 14px;
  font-size: 14px;
  color: var(--color-text-soft);
}
.breadcrumbs ol { display: contents; list-style: none; margin: 0; padding: 0; }
.breadcrumbs li { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumbs li + li::before {
  content: "›";
  color: var(--color-turquoise-400);
  margin-right: 4px;
  font-weight: 700;
}
.breadcrumbs a {
  color: var(--color-teal-700);
  text-decoration: none;
  padding: 2px 8px;
  border-radius: 6px;
  transition: background .2s var(--ease), color .2s var(--ease);
}
.breadcrumbs a:hover { background: var(--color-turquoise-50); color: var(--color-turquoise-700); }
.breadcrumbs .is-current { color: var(--color-text); font-weight: 600; padding: 2px 8px; }

/* ----------------------- Page content (markdown) ----------------------- */
.page {
  padding: 24px 0 80px;
}
.page__body {
  width: 100%;
  max-width: none;
}

.page__body h1 {
  font-size: clamp(1.9rem, 3.6vw, 2.9rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 8px 0 24px;
  background: linear-gradient(115deg, #0E7490 0%, #14B8A6 50%, #22D3EE 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page__body h2 {
  font-size: clamp(1.45rem, 2.2vw, 1.85rem);
  margin: 56px 0 16px;
  color: var(--color-heading);
  letter-spacing: -0.01em;
  position: relative;
  padding-left: 18px;
}
.page__body h2::before {
  content: "";
  position: absolute;
  left: 0; top: .35em; bottom: .35em;
  width: 5px;
  border-radius: 4px;
  background: linear-gradient(180deg, #2DD4BF, #06B6D4);
}

.page__body h3 {
  font-size: clamp(1.18rem, 1.5vw, 1.35rem);
  margin: 36px 0 12px;
  color: var(--color-teal-700);
  letter-spacing: -0.005em;
}
.page__body h4 {
  font-size: 1.05rem;
  margin: 28px 0 10px;
  color: var(--color-heading);
}

.page__body p,
.page__body ul,
.page__body ol {
  margin: 0 0 1.1em;
}

.page__body p { font-size: 1.05rem; }

.page__body ul,
.page__body ol {
  padding-left: 1.5em;
}
.page__body li { margin-bottom: 0.4em; }
.page__body li::marker { color: var(--color-turquoise-500); }

.page__body strong { color: var(--color-heading); }
.page__body em { color: var(--color-teal-700); font-style: italic; }

.page__body a {
  color: var(--color-link);
  text-decoration: none;
  background: linear-gradient(transparent 78%, rgba(45, 212, 191, 0.35) 0);
  background-size: 100% 100%;
  transition: color .2s var(--ease), background-size .2s var(--ease);
  padding: 0 1px;
}
.page__body a:hover {
  color: var(--color-link-hover);
  background: linear-gradient(transparent 0%, rgba(45, 212, 191, 0.35) 0);
}

/* Anchor links rendered by markdown-it-anchor */
.heading-anchor {
  color: inherit;
  text-decoration: none;
  background: none !important;
}
.heading-anchor:hover { color: var(--color-turquoise-600); }

/* ----------------------- Inline code ----------------------- */
.page__body :not(pre) > code {
  font-family: var(--font-mono);
  background: var(--color-code-inline);
  color: var(--color-teal-700);
  font-size: 0.9em;
  padding: 0.12em 0.4em;
  border-radius: 5px;
  border: 0;
  white-space: nowrap;
}

/* ----------------------- Tables ----------------------- */
.table-wrap {
  overflow-x: auto;
  margin: 1.4em 0 1.6em;
  border-radius: var(--radius);
  border: 1px solid var(--color-border-soft);
  background: #fff;
  box-shadow: 0 2px 10px var(--color-shadow);
}
.table-wrap table {
  border-collapse: collapse;
  width: 100%;
  min-width: 540px;
  font-size: 0.97rem;
}
.table-wrap th,
.table-wrap td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border-soft);
}
.table-wrap thead th {
  background: linear-gradient(180deg, #ECFEFF, #DAF3FA);
  color: var(--color-heading);
  font-weight: 700;
  letter-spacing: 0.01em;
}
.table-wrap tbody tr:hover { background: var(--color-foam); }
.table-wrap tbody tr:last-child td { border-bottom: 0; }

/* ----------------------- Code blocks ----------------------- */
.code-block {
  margin: 1.4em 0;
  background: var(--color-code-bg);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius);
  box-shadow: 0 2px 10px var(--color-shadow);
  overflow: hidden;
  position: relative;
}
.code-block__caption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  background: linear-gradient(180deg, #E6FAFC, #D6F2F7);
  border-bottom: 1px solid var(--color-border-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-teal-700);
}
.code-block__copy {
  background: rgba(255,255,255,0.8);
  color: var(--color-teal-700);
  border: 1px solid var(--color-turquoise-200);
  border-radius: 8px;
  padding: 4px 10px;
  font: inherit;
  font-size: 11.5px;
  cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease), transform .15s var(--ease);
}
.code-block__copy:hover { background: var(--color-turquoise-500); color: #fff; transform: translateY(-1px); }
.code-block__copy.is-copied { background: var(--color-teal-500); color: #fff; border-color: var(--color-teal-500); }
.code-block pre {
  margin: 0;
  padding: 18px 20px;
  background: transparent !important;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.65;
  color: #0F2F3D;
}
.code-block pre code { background: transparent; padding: 0; color: inherit; border-radius: 0; white-space: pre; }

/* Prism token coloring — light, turquoise-tuned. */
.token.comment, .token.prolog, .token.doctype, .token.cdata { color: #6B8995; font-style: italic; }
.token.punctuation { color: #4A6975; }
.token.namespace { opacity: 0.7; }
.token.string, .token.attr-value { color: #0E7490; }
.token.boolean, .token.number { color: #0F766E; }
.token.atrule, .token.attr-name, .token.keyword { color: #0891B2; font-weight: 600; }
.token.selector, .token.tag { color: #14B8A6; }
.token.entity, .token.url, .token.symbol, .token.variable, .token.constant, .token.property { color: #0D9488; }
.token.operator { color: #0E7490; }
.token.function, .token.class-name { color: #0EA5A8; font-weight: 600; }
.token.regex, .token.important { color: #0891B2; }
.token.deleted { color: #B91C1C; }
.token.inserted { color: #047857; }

/* ----------------------- Task lists (GFM checkboxes) ----------------------- */
.page__body ul.contains-task-list {
  list-style: none;
  padding-left: 0;
}
.page__body ul.contains-task-list .task-list-item { padding-left: 0; margin-bottom: 0.5em; }
.page__body ul.contains-task-list .task-list-item::marker { content: none; }
.page__body .task-list-item input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 5px;
  border: 1.5px solid var(--color-turquoise-400);
  margin-right: 10px;
  vertical-align: -3px;
  cursor: pointer;
  background: #fff;
  transition: background .15s var(--ease), border-color .15s var(--ease);
  position: relative;
}
.page__body .task-list-item input[type="checkbox"]:hover { border-color: var(--color-teal-600); }
.page__body .task-list-item input[type="checkbox"]:checked {
  background: linear-gradient(135deg, #2DD4BF, #06B6D4);
  border-color: transparent;
}
.page__body .task-list-item input[type="checkbox"]:checked::after {
  content: "";
  position: absolute;
  left: 5px; top: 1px;
  width: 5px; height: 10px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.page__body .task-list-item.is-checked > * { text-decoration: line-through; color: var(--color-text-soft); }
.page__body .task-list-item.is-checked > input[type="checkbox"] { text-decoration: none; }

/* ----------------------- FAQ / Accordions ----------------------- */
details.faq {
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius);
  background: #fff;
  margin: 12px 0;
  box-shadow: 0 2px 10px var(--color-shadow);
  overflow: hidden;
}
details.faq[open] { box-shadow: 0 8px 22px var(--color-shadow-strong); }
details.faq > summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 18px;
  font-weight: 600;
  color: var(--color-heading);
  display: flex;
  align-items: center;
  gap: 12px;
  transition: background .2s var(--ease);
}
details.faq > summary::-webkit-details-marker { display: none; }
details.faq > summary::before {
  content: "+";
  display: grid;
  place-items: center;
  width: 22px; height: 22px;
  background: linear-gradient(135deg, #2DD4BF, #06B6D4);
  color: #fff;
  border-radius: 6px;
  font-size: 16px;
  flex: 0 0 22px;
  transition: transform .2s var(--ease), background .2s var(--ease);
}
details.faq[open] > summary::before {
  content: "−";
  transform: rotate(0deg);
}
details.faq > summary:hover { background: var(--color-foam); }
details.faq > .faq__body {
  padding: 0 18px 16px 52px;
  color: var(--color-text-muted);
}
.faq-group { margin: 24px 0 32px; }

/* ----------------------- Related links / siblings ----------------------- */
.related {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border-soft);
}
.related h2 {
  font-size: 1.2rem !important;
  margin: 0 0 16px !important;
  padding-left: 0 !important;
  color: var(--color-heading);
}
.related h2::before { display: none !important; }
.related-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
}
.related-list a {
  display: block;
  padding: 14px 18px;
  background: #fff;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-heading);
  font-weight: 500;
  transition: transform .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.related-list a:hover {
  border-color: var(--color-turquoise-300);
  transform: translateY(-2px);
  box-shadow: 0 8px 22px var(--color-shadow-strong);
  color: var(--color-teal-700);
}

/* ----------------------- Footer ----------------------- */
.site-footer {
  margin-top: auto;
  background: linear-gradient(180deg, #ECFEFF 0%, #CFFAFE 100%);
  border-top: 1px solid var(--color-turquoise-100);
  padding: 40px 0 24px;
}
.site-footer__inner {
  max-width: var(--max-page);
  margin: 0 auto;
  padding: 0 28px;
  display: grid;
  gap: 28px;
  grid-template-columns: minmax(220px, 1fr) 2fr;
  align-items: start;
}
.site-footer h4 { color: var(--color-heading); margin: 0 0 10px; font-size: 14px; letter-spacing: .08em; text-transform: uppercase; }
.site-footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; }
.site-footer a {
  color: var(--color-teal-700);
  text-decoration: none;
  padding: 4px 0;
  display: inline-block;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.site-footer a:hover { color: var(--color-turquoise-700); border-bottom-color: var(--color-turquoise-300); }
.site-footer__brand p { color: var(--color-text-muted); margin: 8px 0 0; font-size: 14px; max-width: 360px; }
.site-footer__copyright {
  max-width: var(--max-page);
  margin: 22px auto 0;
  padding: 18px 28px 0;
  border-top: 1px solid var(--color-turquoise-200);
  color: var(--color-text-soft);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

/* ----------------------- Responsive ----------------------- */
@media (max-width: 880px) {
  .site-header__inner { padding: 0 18px; gap: 14px; }
  .container, .content-wrap { padding: 0 18px; }
  .hero { padding: 60px 18px 72px; }
  .site-nav {
    position: absolute;
    top: var(--header-height);
    right: 0;
    left: 0;
    background: rgba(255,255,255,.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 14px 18px;
    border-bottom: 1px solid var(--color-border-soft);
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity .2s var(--ease), transform .2s var(--ease);
  }
  .site-nav.is-open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  .site-nav__link { padding: 10px 14px; }
  .nav-toggle { display: inline-grid; place-items: center; margin-left: auto; }
  .site-footer__inner { grid-template-columns: 1fr; }
  .brand__name small { display: none; }
}

@media (max-width: 520px) {
  body { font-size: 16.5px; }
  .page__body p, .page__body { font-size: 1.02rem; }
  .hero__title { font-size: 2rem; }
  .code-block pre { font-size: 0.86rem; }
}

@media (min-width: 1400px) {
  :root { --max-content: 1280px; --max-prose: 1180px; }
}
@media (min-width: 1700px) {
  :root { --max-content: 1360px; --max-prose: 1240px; }
}

/* Mermaid diagrams: blend with palette */
.mermaid {
  background: #fff;
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: 0 2px 10px var(--color-shadow);
  margin: 1.4em 0;
  overflow: auto;
}

/* Focus visibility */
:where(a, button, summary, input[type="checkbox"]):focus-visible {
  outline: 2px solid var(--color-turquoise-500);
  outline-offset: 2px;
  border-radius: 6px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}