/* Swiftener Platform — shared UI chrome (suites own personality skins) */

/* ---- Topbar ---- */
.platform-topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 1000;
  height: var(--platform-topbar-h);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0 1rem;
  color: var(--platform-text);
  background: color-mix(in srgb, var(--platform-bg-elevated) 92%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--platform-border);
}

.platform-topbar__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--platform-text);
  text-decoration: none;
  font-weight: 750;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.platform-topbar__mark {
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 0.35rem;
  background: linear-gradient(
    145deg,
    var(--platform-accent),
    color-mix(in srgb, var(--platform-accent) 40%, #0f172a)
  );
  flex-shrink: 0;
}

.platform-topbar__nav {
  display: none;
  align-items: center;
  gap: 0.15rem;
  flex: 1;
  min-width: 0;
  margin-left: 0.5rem;
}

.platform-topbar__link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.3rem 0.55rem;
  border-radius: var(--platform-radius);
  color: var(--platform-text-muted);
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
  transition: background var(--platform-transition), color var(--platform-transition);
}

.platform-topbar__link:hover {
  color: var(--platform-text);
  background: var(--platform-surface-muted);
}

.platform-topbar__link.is-active {
  color: var(--platform-accent);
  background: var(--platform-accent-soft);
}

.platform-topbar__menu {
  position: relative;
  margin-left: auto;
}

.platform-topbar__menu-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.platform-topbar__menu-panel {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 0.4rem);
  min-width: 12rem;
  padding: 0.4rem;
  background: var(--platform-bg-elevated);
  border: 1px solid var(--platform-border);
  border-radius: var(--platform-radius);
  box-shadow: var(--platform-shadow);
  z-index: 1100;
}

.platform-topbar__menu[open] .platform-topbar__menu-panel {
  display: grid;
  gap: 0.15rem;
}

.platform-topbar__menu-panel a {
  display: block;
  padding: 0.5rem 0.65rem;
  border-radius: var(--platform-radius-sm);
  color: var(--platform-text-muted);
  text-decoration: none;
  font-size: 0.8125rem;
  font-weight: 600;
}

.platform-topbar__menu-panel a:hover,
.platform-topbar__menu-panel a.is-active {
  color: var(--platform-accent);
  background: var(--platform-accent-soft);
}

.platform-topbar__actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

@media (min-width: 960px) {
  .platform-topbar__nav {
    display: flex;
  }

  .platform-topbar__menu {
    display: none;
  }
}

@media (max-width: 959px) {
  .platform-topbar__suite {
    display: none;
  }
}

/* ---- Buttons ---- */
.platform-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  border-radius: var(--platform-radius);
  border: 1px solid transparent;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--platform-transition), border-color var(--platform-transition),
    color var(--platform-transition), transform 0.12s ease;
}

.platform-btn:focus-visible {
  outline: none;
  box-shadow: var(--platform-focus);
}

.platform-btn--primary {
  background: var(--platform-accent);
  color: #fff;
}

.platform-btn--primary:hover {
  background: var(--platform-accent-hover);
}

.platform-btn--ghost {
  background: transparent;
  color: var(--platform-text-muted);
  border-color: var(--platform-border);
}

.platform-btn--ghost:hover {
  color: var(--platform-text);
  background: var(--platform-surface-muted);
}

.platform-btn--sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.78rem;
}

/* ---- Footer (slim) ---- */
.platform-footer {
  margin-top: 4rem;
  padding: 1.75rem 1.25rem 2.25rem;
  border-top: 1px solid var(--platform-border);
  background: var(--platform-surface-muted);
}

.platform-footer__inner {
  max-width: var(--platform-content-max);
  margin: 0 auto;
  display: grid;
  gap: 1.25rem;
}

.platform-footer__row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.25rem 2rem;
}

.platform-footer__col {
  display: grid;
  gap: 0.4rem;
  min-width: 8rem;
}

.platform-footer__heading {
  margin: 0;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--platform-text-subtle);
  font-weight: 700;
}

.platform-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
}

.platform-footer__links a {
  color: var(--platform-text-muted);
  text-decoration: none;
  font-size: 0.875rem;
}

.platform-footer__links a:hover {
  color: var(--platform-accent);
}

.platform-footer__share {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.platform-footer__share-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  color: var(--platform-text-muted);
  border: 1px solid var(--platform-border);
  background: transparent;
  transition: color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.platform-footer__share-link:hover {
  color: var(--platform-accent);
  border-color: var(--platform-accent);
  transform: translateY(-1px);
}

.platform-footer__share-link svg {
  width: 1.05rem;
  height: 1.05rem;
  display: block;
}

.platform-footer__note {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--platform-text-muted);
  max-width: 40rem;
  line-height: 1.5;
}

.platform-footer__meta {
  margin: 0;
  font-size: 0.75rem;
  color: var(--platform-text-subtle);
}

body.has-platform-footer .site-footer:not(.platform-footer),
body.has-platform-footer .home-footer {
  display: none;
}

/* ---- Kill duplicate suite brand chrome ---- */
body.has-platform-topbar .app > header.header,
body.has-platform-topbar .app-home > header.header,
body.has-platform-topbar .app-wide > header.header,
body.has-platform-topbar .shell > .top,
body.has-platform-topbar > header:not(.platform-topbar):not(.site-header):first-of-type,
body.has-platform-topbar .shell > header.site-header .brand,
body.has-platform-topbar .shell > header.site-header .brand-link,
body.has-platform-topbar .shell > header.site-header .header-actions,
body.has-platform-topbar .home-header .home-brand,
body.has-platform-topbar .app-header > div:first-child:not(.app-nav),
body.has-platform-topbar #theme-toggle.theme-toggle {
  display: none !important;
}

/* MathTools / Reference brand bars — hide whole header when it only duplicates topbar */
body.has-platform-topbar .shell > header.site-header:not(:has(.app-nav)) {
  display: none !important;
}

body.has-platform-topbar .shell > header.site-header:has(.app-nav) {
  display: block;
  padding-top: 0.5rem;
  border-bottom: none;
  background: transparent;
}

body.has-platform-topbar .shell > header.site-header:has(.app-nav) .brand,
body.has-platform-topbar .shell > header.site-header:has(.app-nav) .header-actions {
  display: none !important;
}

body.has-platform-topbar .home-header {
  padding-top: 0.75rem;
  border-bottom: 1px solid var(--platform-border);
  background: transparent;
}

body.has-platform-topbar .app-header {
  align-items: flex-start;
}

body.has-platform-topbar .app-header .app-nav {
  width: 100%;
}

/* PDF SPA: legacy page header demotion (sidebar layout owns intro) */
body.has-platform-topbar > header:not(.platform-topbar):not(.pdf-sidebar) {
  display: none !important;
}

body.has-platform-topbar .pdf-sidebar__intro h1 {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* Visually-hidden, screen-reader/crawler accessible */
.platform-sr-only {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Help blocks */
.app-help,
.platform-help {
  margin: 1rem 0 1.5rem;
  padding: 1rem 1.15rem;
  background: var(--platform-surface);
  border: 1px solid var(--platform-border);
  border-radius: var(--platform-radius-lg);
  font-size: 0.9rem;
  color: var(--platform-text-muted);
  box-shadow: var(--platform-shadow-sm);
}

.app-help-intro,
.platform-help__intro,
.help-intro {
  margin: 0 0 0.75rem;
  line-height: 1.55;
}

.help-tips,
.app-help-tips,
.app-help-features {
  margin: 0.5rem 0 0;
}

.help-tips summary,
.app-help-tips summary,
.app-help-features summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--platform-text);
  margin-bottom: 0.35rem;
  user-select: none;
}

.app-help ul,
.help-tips ul,
.platform-help ul {
  margin: 0.35rem 0 0;
  padding-left: 1.2rem;
}

.app-help li,
.help-tips li {
  margin-bottom: 0.35rem;
  line-height: 1.45;
}

.help-privacy {
  margin: 0.75rem 0 0;
  font-size: 0.82rem;
  opacity: 0.95;
}

/* Interactive destination cards only */
.platform-card {
  background: var(--platform-surface);
  border: 1px solid var(--platform-border);
  border-radius: var(--platform-radius-lg);
  padding: 1.25rem;
  box-shadow: none;
  transition: border-color var(--platform-transition), transform var(--platform-transition);
}

a.platform-card:hover {
  transform: translateY(-2px);
  border-color: color-mix(in srgb, var(--platform-accent) 40%, var(--platform-border));
}

/* Drop zones */
.platform-dropzone,
.drop-zone,
.dropzone {
  border: 2px dashed var(--platform-border);
  border-radius: var(--platform-radius-lg);
  padding: 2rem 1.5rem;
  text-align: center;
  cursor: pointer;
  background: var(--platform-surface-muted);
  transition: border-color var(--platform-transition), background var(--platform-transition);
}

.platform-dropzone:hover,
.platform-dropzone.dragover,
.drop-zone:hover,
.drop-zone.dragover,
.dropzone:hover,
.dropzone.dragover {
  border-color: var(--platform-accent);
  background: var(--platform-accent-soft);
}

.hint,
.drop-hint,
.tool-hint {
  color: var(--platform-text-subtle);
  font-size: 0.85rem;
  line-height: 1.45;
}

/* Suite page title block (used when legacy header is hidden) */
.platform-page-intro {
  max-width: var(--platform-content-max);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 0.75rem;
}

.platform-page-intro h1 {
  margin: 0 0 0.4rem;
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.platform-page-intro p {
  margin: 0;
  max-width: 40rem;
  color: var(--platform-text-muted);
  font-size: 1rem;
  line-height: 1.55;
}

/* Shared suite-home chrome: full-width search + equal card grid */
.platform-suite-shell {
  max-width: var(--platform-content-max);
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
}

.platform-tool-search-wrap {
  max-width: var(--platform-content-max);
  margin: 0 auto 1.25rem;
  padding: 0 1.25rem;
  width: 100%;
  box-sizing: border-box;
}

.platform-suite-shell > .platform-tool-search-wrap,
.platform-page-intro + .platform-tool-search-wrap {
  padding-left: 0;
  padding-right: 0;
}

.platform-tool-search {
  display: block;
  width: 100%;
  box-sizing: border-box;
  margin: 0;
  padding: 0.75rem 1rem;
  border-radius: var(--platform-radius);
  border: 1px solid var(--platform-border);
  background: var(--platform-surface);
  color: var(--platform-text);
  font: inherit;
  font-size: 0.9375rem;
  line-height: 1.4;
}

.platform-tool-search::placeholder {
  color: var(--platform-text-subtle);
}

.platform-tool-search:focus {
  outline: none;
  border-color: var(--platform-accent);
  box-shadow: var(--platform-focus);
}

.platform-tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15.5rem, 1fr));
  gap: 0.85rem;
  align-items: stretch;
}

.platform-tool-card,
a.platform-tool-card {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-height: 8.5rem;
  padding: 1rem 1.1rem;
  border-radius: var(--platform-radius);
  border: 1px solid var(--platform-border);
  background: var(--platform-surface);
  color: inherit;
  text-decoration: none;
  transition: border-color var(--platform-transition), transform var(--platform-transition), background var(--platform-transition);
}

.platform-tool-card:hover,
a.platform-tool-card:hover {
  border-color: color-mix(in srgb, var(--platform-accent) 45%, var(--platform-border));
  background: color-mix(in srgb, var(--platform-accent) 6%, var(--platform-surface));
  transform: translateY(-2px);
}

.platform-tool-card h2,
.platform-tool-card h3,
.platform-tool-card .platform-tool-card__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--platform-text);
}

.platform-tool-card p,
.platform-tool-card .platform-tool-card__desc {
  margin: 0;
  flex: 1;
  font-size: 0.875rem;
  line-height: 1.45;
  color: var(--platform-text-muted);
}

.platform-section-label {
  margin: 1.5rem 0 0.65rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--platform-text-subtle);
}

.is-search-hidden {
  display: none !important;
}

/* Cookie / analytics consent banner */
.platform-cookie-banner {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10000;
  padding: 0.85rem 1rem calc(0.85rem + env(safe-area-inset-bottom, 0px));
  background: var(--platform-bg-elevated);
  border-top: 1px solid var(--platform-border);
  box-shadow: var(--platform-shadow-lg);
}

.platform-cookie-banner__inner {
  max-width: var(--platform-content-max);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem 1.25rem;
}

.platform-cookie-banner__text {
  margin: 0;
  flex: 1 1 16rem;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--platform-text-muted);
}

.platform-cookie-banner__text a {
  color: var(--platform-accent);
}

.platform-cookie-banner__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.platform-cookie-banner .platform-btn {
  min-width: 5.5rem;
}

/* Motion utilities */
@keyframes platform-fade-up {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.platform-motion-in {
  animation: platform-fade-up 0.45s ease both;
}

.platform-page-intro.platform-motion-in,
.platform-page-intro {
  animation: platform-fade-up 0.45s ease both;
}

a.app-card,
a.tool-card,
a.home-app-card,
a.suite-card {
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

a.app-card:hover,
a.tool-card:hover,
a.home-app-card:hover,
a.suite-card:hover {
  transform: translateY(-2px);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  a.app-card:hover,
  a.tool-card:hover,
  a.home-app-card:hover,
  a.suite-card:hover {
    transform: none;
  }
}