/* -----------------------------------------
   AltoTrail Public Content Shell
   Shared shell baseline for:
   - FAQ
   - Project Updates
   - legal/support pages

   Theme responsibility:
   - consumes shared tokens from /global/theme-tokens.css
   - does not define AltoTrail-wide theme variants
------------------------------------------ */

:root {
  --shell-max-width: 700px;
  --content-max-width: 700px;
  --header-gap: 16px;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  line-height: 1.6;
}

body {
  margin: 0;
}

a {
  color: var(--link, var(--accent));
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

strong {
  color: var(--heading);
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 32px 0;
}

/* -----------------------------------------
   Shared public content shell
------------------------------------------ */

.public-content-page,
.legal-page {
  max-width: 100%;
  margin: 0;
}

body.public-content-page,
body.legal-page {
  min-height: 100vh;
  padding: 24px 16px 40px;
}

.public-content-shell,
.legal-shell {
  width: 100%;
  max-width: var(--shell-max-width);
  margin: 0 auto;
  padding: 26px 26px 24px;
  background: var(--shell-bg, var(--surface-elevated, var(--card)));
  border: 1px solid var(--shell-border, var(--border));
  border-radius: 14px;
  box-shadow: var(--card-shadow);
}

/* -----------------------------------------
   Shared header
------------------------------------------ */

.public-content-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  column-gap: var(--header-gap);
  row-gap: 8px;
  margin-bottom: 34px;
}

.public-content-header-left {
  display: contents;
}

.public-content-header-right {
  grid-column: 2;
  grid-row: 1;
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  gap: 10px;
  flex: 0 0 auto;
  flex-wrap: wrap;
}

.public-content-brand {
  grid-column: 1;
  grid-row: 1;
  margin: 0;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.10em;
  line-height: 1.2;
  text-transform: uppercase;
}

.public-content-brand .site-brand-link {
  color: inherit;
  text-decoration: none;
}

.public-content-brand .site-brand-link:hover {
  text-decoration: none;
}

.public-content-brand .site-brand-link:focus-visible {
  outline: none;
}

.public-content-header-title {
  grid-column: 1 / -1;
  min-width: 0;
  margin: 0;
  max-width: 34rem;
  color: var(--heading);
  font-size: clamp(1.55rem, 2.4vw, 1.8rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.public-content-header-intro {
  grid-column: 1 / -1;
  min-width: 0;
  margin: 0;
  max-width: 42rem;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.55;
}

/* -----------------------------------------
   Hero + body
------------------------------------------ */

.public-content-hero {
  max-width: var(--content-max-width);
  margin: 0 0 30px;
}

.public-content-title {
  margin: 0 0 12px;
  font-size: clamp(2.15rem, 4vw, 3rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
  color: var(--heading);
}

.public-content-intro {
  margin: 0;
  max-width: 62ch;
  font-size: 1.02rem;
  line-height: 1.72;
  color: var(--muted);
}

.public-content-body {
  max-width: var(--content-max-width);
}

/* -----------------------------------------
   FAQ content
------------------------------------------ */

.faq-page .public-content-body,
.public-content-page--faq .public-content-body {
  display: grid;
  gap: 28px;
}

.faq-section {
  display: grid;
  gap: 14px;
}

.faq-section-title,
.faq-section h2 {
  margin: 0 0 2px;
  font-size: 1.02rem;
  line-height: 1.25;
  color: var(--heading);
  letter-spacing: 0.02em;
}

.faq-item {
  padding: 18px 0 4px;
  border: 0;
  border-top: 1px solid var(--card-border, var(--border));
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.faq-item h3 {
  margin: 0 0 10px;
  font-size: 1rem;
  line-height: 1.35;
  color: var(--heading);
}

.faq-item p {
  margin: 0;
  color: var(--text);
  line-height: 1.72;
}

.faq-item p a {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

/* -----------------------------------------
   Mobile
------------------------------------------ */

@media (max-width: 640px) {
  body.public-content-page,
  body.legal-page {
    padding: 14px;
  }

  .public-content-shell,
  .legal-shell {
    padding: 16px 14px 18px;
    border-radius: 10px;
  }

  .public-content-header {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
    column-gap: 12px;
    row-gap: 14px;
    margin-bottom: 28px;
  }

  .public-content-header-right {
    display: contents;
  }

  .public-content-header-right .site-nav {
    grid-column: 2;
    grid-row: 1;
    justify-self: end;
    align-self: start;
  }

  .public-content-header-right .theme-pills {
    grid-column: 1 / -1;
    justify-self: start;
    width: fit-content;
    max-width: 100%;
  }

  .public-content-header .public-content-header-right .theme-pills {
    grid-row: auto;
  }

  .public-content-brand {
    margin-top: 0;
    font-size: 0.72rem;
    line-height: 1.2;
  }

  .public-content-hero {
    margin-bottom: 24px;
  }

  .public-content-title {
    font-size: clamp(1.9rem, 8vw, 2.45rem);
    margin-bottom: 10px;
  }

  .public-content-intro {
    font-size: 0.98rem;
    line-height: 1.72;
  }

  .faq-page .public-content-body,
  .public-content-page--faq .public-content-body {
    gap: 24px;
  }

  .faq-item {
    padding: 16px 0 4px;
  }

}

/* -----------------------------------------
   Dark theme panel elevation
   Adds subtle surface separation for shared public content shells.
------------------------------------------ */

html[data-theme="dark"] .public-content-shell,
html[data-theme="dark"] .legal-shell {
  background:
    linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.028) 0%,
      rgba(255, 255, 255, 0.010) 100%
    ),
    var(--shell-bg, var(--surface-elevated, var(--card)));
  box-shadow:
    0 26px 70px rgba(0, 0, 0, 0.72),
    0 0 0 1px rgba(255, 255, 255, 0.035),
    inset 0 1px 0 rgba(255, 255, 255, 0.050);
}

html[data-theme="system"] .public-content-shell,
html[data-theme="system"] .legal-shell {
  background:
    linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.032) 0%,
      rgba(255, 255, 255, 0.012) 100%
    ),
    var(--shell-bg, var(--surface-elevated, var(--card)));
  box-shadow:
    0 26px 70px rgba(0, 0, 0, 0.58),
    0 0 0 1px rgba(255, 255, 255, 0.035),
    inset 0 1px 0 rgba(255, 255, 255, 0.050);
}

/* -----------------------------------------
   Opt-in separated surface composition
   The default public content shell remains unchanged.
------------------------------------------ */

.public-content-shell[data-public-content-composition="separated-surfaces"],
html[data-theme] .public-content-shell[data-public-content-composition="separated-surfaces"] {
  padding: 0;
  background: transparent;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.public-content-shell[data-public-content-composition="separated-surfaces"] > .public-content-header,
.public-content-shell[data-public-content-composition="separated-surfaces"] > .public-content-primary-surface {
  width: 100%;
  padding: 26px 26px 24px;
  background: var(--shell-bg, var(--surface-elevated, var(--card)));
  border: 1px solid var(--shell-border, var(--border));
  border-radius: 14px;
  box-shadow: var(--card-shadow);
}

.public-content-shell[data-public-content-composition="separated-surfaces"] > .public-content-header {
  margin-bottom: 0;
}

.public-content-shell[data-public-content-composition="separated-surfaces"] > .public-announcement {
  margin: 16px 0 0;
}

.public-content-shell[data-public-content-composition="separated-surfaces"] > .public-content-primary-surface {
  margin-top: 16px;
}

@media (max-width: 640px) {
  .public-content-shell[data-public-content-composition="separated-surfaces"] > .public-content-header,
  .public-content-shell[data-public-content-composition="separated-surfaces"] > .public-content-primary-surface {
    padding: 16px 14px 18px;
    border-radius: 10px;
  }
}