/* shell.css — AppShell layout: skip link, wrap, header, nav, hero, footer */

/* ---------- skip link ---------- */

.skip,
.skip-link {
  position: absolute;
  left: 16px;
  top: -100px;
  z-index: 100;
  padding: 10px 16px;
  border-radius: var(--radius-ctrl);
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  font-weight: 600;
  transition: top var(--ease);
}

.skip:focus,
.skip:focus-visible,
.skip-link:focus,
.skip-link:focus-visible {
  top: 16px;
  text-decoration: none;
}

/* ---------- wrap ---------- */

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 20px;
}

.wrap-wide {
  width: 100%;
  max-width: var(--wrap-wide);
  margin-inline: auto;
  padding-inline: 20px;
}

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

.app-header {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 18px 20px;
  width: 100%;
}

.brand {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}

.brand:hover {
  text-decoration: none;
  color: var(--text);
}

.brand:focus-visible {
  border-radius: 8px;
}

/* ---------- segmented nav ---------- */

.seg-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1 1 auto;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.seg-nav::-webkit-scrollbar {
  display: none;
}

.seg-nav a {
  flex: 0 0 auto;
  padding: 7px 13px;
  border-radius: 0;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--ease), background-color var(--ease);
}

.seg-nav a:hover {
  color: var(--text);
  background: color-mix(in srgb, var(--text) 7%, transparent);
  text-decoration: none;
}

.seg-nav a.is-active,
.seg-nav a[aria-current="page"] {
  color: var(--card);
  background: var(--text);
  font-weight: 600;
}

/* ---------- topbar (theme + lang) ---------- */

.topbar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.pill-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 34px;
  padding: 6px 12px;
  border-radius: 0;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  transition: color var(--ease), border-color var(--ease),
    background-color var(--ease), transform var(--ease);
}

.pill-btn:hover {
  color: var(--text);
  border-color: var(--text);
  text-decoration: none;
}

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

.pill-btn[aria-pressed="true"] {
  color: var(--card);
  border-color: var(--text);
  background: var(--text);
}

.pill-btn svg {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
}

/* ---------- hero (home) ---------- */

.hero {
  padding-block: 40px 28px;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero h1 {
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 800;
  margin-bottom: 12px;
}

.hero p {
  max-width: 60ch;
  color: var(--muted);
  font-size: 16px;
}

/* ---------- page head (tool pages) ---------- */

.page-head {
  padding-block: 28px 20px;
}

.page-head h1 {
  font-size: clamp(24px, 4vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 800;
  margin-bottom: 8px;
}

.page-head .sub,
.page-head p {
  max-width: 62ch;
  color: var(--muted);
  font-size: 15px;
}

/* ---------- footer ---------- */

.site-footer {
  padding-block: 32px 40px;
  margin-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.site-footer p {
  margin: 0;
}

/* ---------- mobile ---------- */

@media (max-width: 640px) {
  .app-header {
    gap: 10px 12px;
    padding-block: 14px;
  }

  .seg-nav {
    order: 3;
    flex-basis: 100%;
    margin-inline: -20px;
    padding-inline: 20px;
  }

  .topbar {
    margin-left: auto;
  }

  .hero {
    padding-block: 28px 20px;
  }

  .page-head {
    padding-block: 20px 16px;
  }
}