/* Base document, layout primitives, header, footer and buttons shared by every page. */

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--space-md));
}

body {
  background: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  text-rendering: optimizeLegibility;
}

body.nav-open {
  overflow: hidden;
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  line-height: var(--leading-snug);
  letter-spacing: -0.01em;
}

h1,
h2 {
  font-stretch: var(--stretch-display);
  line-height: var(--leading-tight);
  letter-spacing: -0.025em;
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

a {
  text-decoration-color: var(--color-primary-line);
  text-underline-offset: 0.2em;
  transition: color var(--duration-fast) ease, text-decoration-color var(--duration-fast) ease;
}

a:hover {
  text-decoration-color: currentColor;
}

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-xs);
}

::selection {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

code,
kbd,
samp {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

/* ---------- Utilities ---------- */

.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;
  top: var(--space-xs);
  left: var(--space-xs);
  z-index: 100;
  padding: var(--space-xs) var(--space-md);
  background: var(--color-primary);
  color: var(--color-on-primary);
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: none;
}

.container {
  width: min(100% - 2 * var(--gutter), var(--container-width));
  margin-inline: auto;
}

.container--narrow {
  width: min(100% - 2 * var(--gutter), var(--container-narrow));
}

.icon {
  width: 1.25em;
  height: 1.25em;
  flex-shrink: 0;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.eyebrow::before {
  content: "";
  width: 1.5rem;
  height: 1px;
  background: currentColor;
}

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

.btn {
  --btn-bg: var(--color-surface-2);
  --btn-fg: var(--color-text);
  --btn-border: var(--color-border-strong);

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  min-height: 48px;
  padding: 0 var(--space-lg);
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--duration-fast) ease, border-color var(--duration-fast) ease,
    transform var(--duration-fast) ease;
}

.btn:hover {
  --btn-bg: var(--color-surface-3);
}

.btn:active {
  transform: translateY(1px);
}

.btn--primary {
  --btn-bg: var(--color-primary);
  --btn-fg: var(--color-on-primary);
  --btn-border: var(--color-primary);
}

.btn--primary:hover {
  --btn-bg: var(--color-primary-strong);
  --btn-border: var(--color-primary-strong);
}

.btn--ghost {
  --btn-bg: transparent;
}

.btn--sm {
  min-height: 40px;
  padding: 0 var(--space-md);
}

/* App Store CTA rendered without a URL: visible but inert. */
.btn[aria-disabled="true"] {
  --btn-bg: var(--color-surface-2);
  --btn-fg: var(--color-text-soft);
  --btn-border: var(--color-border-strong);
  cursor: default;
  transform: none;
}

.btn__meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
}

/* ---------- Header / navigation ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration-base) ease;
}

/* Blur lives on a pseudo-element: backdrop-filter on the header itself would
   become the containing block for the fixed mobile drawer. */
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgb(8 9 11 / 0.86);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  backdrop-filter: saturate(140%) blur(12px);
}

.site-header.is-scrolled,
.nav-open .site-header {
  border-bottom-color: var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  min-height: var(--header-height);
}

.brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  padding-block: var(--space-xs);
}

.brand img {
  width: clamp(150px, 30vw, 184px);
}

/* Datalog Viewer + Log in: always visible in the header (on phones too, outside the drawer). */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin-left: auto;
}

.site-header__actions .btn {
  min-height: 44px;
  white-space: nowrap;
}

@media (max-width: 559px) {
  .site-header__inner {
    gap: var(--space-xs);
  }

  .brand img {
    width: 128px;
  }

  .site-header__actions .btn {
    padding: 0 var(--space-sm);
    font-size: var(--text-sm);
  }
}

/* Narrow phones: the brand becomes the symbol (<picture> <source>) so both buttons fit. */
@media (max-width: 419px) {
  .brand img {
    width: auto;
    height: 34px;
  }
}

.nav-toggle {
  display: none;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-right: calc(-1 * var(--space-xs));
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

.nav-toggle .icon {
  width: 24px;
  height: 24px;
}

.nav-toggle__close,
.nav-open .nav-toggle__open {
  display: none;
}

.nav-open .nav-toggle__close {
  display: block;
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2xs) var(--space-md);
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--color-text-soft);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
}

.site-nav__link:hover,
.site-nav__link[aria-current="page"] {
  color: var(--color-text);
}


/* Mobile drawer — only when JS is available to drive it. */
@media (max-width: 1179px) {
  .js .nav-toggle {
    display: grid;
  }

  .js .site-nav {
    position: fixed;
    inset: var(--header-height) 0 0 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    padding: var(--space-lg) var(--gutter) var(--space-2xl);
    background: var(--color-background);
    overflow-y: auto;
    overscroll-behavior: contain;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--duration-base) var(--ease-out), transform var(--duration-base) var(--ease-out),
      visibility 0s linear var(--duration-base);
  }

  .js .site-nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: none;
    transition-delay: 0s;
  }

  .js .site-nav__list {
    flex-direction: column;
    gap: 0;
  }

  .js .site-nav__link {
    width: 100%;
    min-height: 60px;
    border-bottom: 1px solid var(--color-border);
    font-size: var(--text-lg);
    font-stretch: var(--stretch-display);
    font-weight: 600;
    color: var(--color-text);
  }
}

@media (min-width: 1180px) {
  .site-nav {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    margin-left: auto;
  }

  .site-nav__list {
    gap: var(--space-xl);
  }
}

/* ---------- Sections ---------- */

.section {
  padding-block: var(--space-section);
}

.section--bordered {
  border-top: 1px solid var(--color-border);
}

.section-header {
  display: grid;
  gap: var(--space-md);
  max-width: 44rem;
  margin-bottom: var(--space-2xl);
}

.section-header h2 {
  font-size: var(--text-2xl);
}

.section-header p {
  color: var(--color-muted);
  font-size: var(--text-md);
}

.demo-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: 2px var(--space-xs);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.demo-label::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-warning);
}

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

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-2xl) var(--space-xl);
  background: var(--color-background-raised);
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.site-footer__grid {
  display: grid;
  gap: var(--space-xl);
}

.site-footer__brand img {
  width: 168px;
  margin-bottom: var(--space-md);
}

.site-footer__brand p {
  max-width: 22rem;
}

.site-footer h2 {
  margin-bottom: var(--space-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  font-stretch: 100%;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-faint);
}

.site-footer ul {
  display: grid;
  gap: var(--space-xs);
}

.site-footer a {
  color: var(--color-text-soft);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--color-text);
}

.site-footer__legal {
  display: grid;
  gap: var(--space-sm);
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--color-faint);
}

@media (min-width: 720px) {
  .site-footer__grid {
    grid-template-columns: 2fr repeat(4, 1fr);
  }
}

/* Placeholder for values not yet configured in config.js. */
.config-placeholder {
  padding: 1px 6px;
  border: 1px dashed var(--color-warning);
  border-radius: var(--radius-xs);
  background: var(--color-warning-soft);
  color: var(--color-warning);
  font-family: var(--font-mono);
  font-size: 0.85em;
  white-space: normal;
}