/* Shared shell/header styles for Home, Guide, and Builder */
@font-face {
  font-family: "Inter";
  src: url("/fonts/inter-variable.woff2") format("woff2");
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}

.st-wrap {
  max-width: 1440px;
  margin: 0 auto;
  padding: 1.25rem;
}

.st-header {
  padding: 1rem 1.15rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  border: 1px solid var(--st-border);
  border-radius: 18px;
  background: var(--st-panel);
  backdrop-filter: blur(8px);
  box-shadow: var(--st-shadow);
}

.st-brand {
  display: flex;
  align-items: center;
  min-width: 0;
  flex: 1 1 auto;
}

.st-brand-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.st-logo {
  display: block;
  height: 3rem;
  width: auto;
}

.st-logo svg {
  display: block;
  height: 100%;
  width: auto;
}

.st-logo svg path[fill="#0E172A"] {
  transition: fill .18s ease;
}

body.page-dark .st-logo svg path[fill="#0E172A"],
body.tb-dark .st-logo svg path[fill="#0E172A"] {
  fill: #e6eefc;
}

.st-header-nav {
  display: flex;
  align-items: center;
  gap: .5rem;
  flex-wrap: nowrap;
  flex: 0 0 auto;
  align-self: flex-start;
  margin-left: auto;
}

.st-header-btn {
  width: auto;
  min-width: 0;
  min-height: 40px;
  box-sizing: border-box;
  padding: .65rem .9rem;
  border-radius: 12px;
  font-size: .88rem;
  line-height: 1.2;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.st-header-nav .btn,
.st-header-nav .tb-btn {
  border: 1px solid var(--st-border);
  border-color: var(--st-border);
}

.st-header-nav .btn {
  appearance: none;
  font-family: inherit;
  cursor: pointer;
}

.st-header-nav .btn,
.st-header-nav .btn:not(.primary),
.st-header-nav .tb-btn.tb-btn-ghost {
  background: #fff;
  color: var(--st-ink);
}

body.page-dark .st-header-nav .btn:not(.primary),
body.tb-dark .st-header-nav .tb-btn.tb-btn-ghost {
  background: rgba(15, 23, 42, 0.92);
  color: var(--st-ink);
}

.st-page-mode-btn {
  min-width: 0;
  min-height: 40px;
  padding: .42rem .62rem !important;
  gap: .55rem;
  background: #fff !important;
  border-color: var(--st-border) !important;
}

.st-page-mode-track {
  width: 2.55rem;
  height: 1.45rem;
  border-radius: 999px;
  border: 1px solid #c8d2e6;
  background: #f8fbff;
  position: relative;
  flex: 0 0 auto;
  transition: background .18s ease, border-color .18s ease;
}

.st-page-mode-knob {
  position: absolute;
  top: 1px;
  left: 1px;
  width: calc(1.45rem - 4px);
  height: calc(1.45rem - 4px);
  border-radius: 999px;
  background: #98a3bd;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 1px 2px rgba(15, 23, 42, .14);
  transition: transform .18s ease, background .18s ease;
}

.st-page-mode-knob::before {
  content: "☾";
  font-size: .72rem;
  line-height: 1;
  color: #fff;
  transform: translateY(-.02rem);
}

.st-page-mode-label {
  min-width: 2.25rem;
  text-align: left;
  color: var(--st-muted);
  font-weight: 600;
  line-height: 1;
  font-size: .86rem;
}

.st-page-mode-btn.is-dark {
  border-color: #2a53e0 !important;
  background: linear-gradient(180deg, rgba(48,95,252,.08), rgba(48,95,252,.04)), #fff !important;
}

.st-page-mode-btn.is-dark .st-page-mode-track {
  background: linear-gradient(180deg, #3c64f2, #2349da);
  border-color: #2a53e0;
}

.st-page-mode-btn.is-dark .st-page-mode-knob {
  transform: translateX(1.1rem);
  background: #fff;
}

.st-page-mode-btn.is-dark .st-page-mode-knob::before {
  content: "☀";
  color: #305FFC;
  font-size: .7rem;
  transform: none;
}

.st-page-mode-btn.is-dark .st-page-mode-label {
  color: var(--st-ink);
}

body.page-dark .st-page-mode-btn {
  background: rgba(15, 23, 42, 0.92) !important;
  border-color: var(--st-border) !important;
}

body.page-dark .st-page-mode-btn .st-page-mode-track {
  border-color: rgba(148,163,184,.35);
  background: rgba(15,23,42,.72);
}

body.page-dark .st-page-mode-btn .st-page-mode-label {
  color: var(--st-muted);
}

body.page-dark .st-page-mode-btn.is-dark .st-page-mode-label {
  color: #e6eefc;
}

body.tb-dark .st-page-mode-btn {
  background: rgba(15, 23, 42, 0.92) !important;
  border-color: var(--st-border) !important;
}

body.tb-dark .st-page-mode-btn .st-page-mode-track {
  border-color: rgba(148,163,184,.35);
  background: rgba(15,23,42,.72);
}

body.tb-dark .st-page-mode-btn .st-page-mode-label {
  color: var(--st-muted);
}

.st-footer {
  margin-top: 1.25rem;
  border: 1px solid var(--st-border);
  border-radius: 16px;
  background: var(--st-panel);
  backdrop-filter: blur(8px);
  box-shadow: var(--st-shadow);
  padding: .9rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem 1rem;
  flex-wrap: wrap;
  color: var(--st-muted);
  font-size: .86rem;
  line-height: 1.35;
}

.st-footer-copy {
  color: var(--st-muted);
}

.st-footer-links {
  display: flex;
  align-items: center;
  gap: .4rem .75rem;
  flex-wrap: wrap;
}

.st-footer-links a {
  color: var(--st-ink);
  text-decoration: none;
  font-weight: 500;
}

.st-footer-links a:hover {
  text-decoration: underline;
  text-underline-offset: 2px;
}

@media (max-width: 640px) {
  .st-logo { height: 2.6rem; }

  .st-header-nav {
    width: 100%;
    flex-wrap: wrap;
  }

  .st-header-nav .st-header-btn {
    flex: 1 1 calc(50% - .35rem);
  }

  .st-footer {
    padding: .85rem .9rem;
    align-items: flex-start;
    flex-direction: column;
  }
}