/* OP-20260728-232: scoped site-brand sizing prevents the transparent logo asset from escaping the navigation bar. */
.tx-global-tool-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: 58px;
  color: #2d332f;
  background: rgba(255,255,255,.94);
  border-bottom: 1px solid rgba(31,52,42,.14);
  box-shadow: 0 4px 18px rgba(19,34,26,.06);
  backdrop-filter: saturate(150%) blur(20px);
}
.tx-global-tool-nav > nav {
  width: min(1440px,100%);
  height: 100%;
  margin: auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: minmax(172px,auto) minmax(0,1fr) auto;
  align-items: center;
  gap: 18px;
}
.tx-global-tool-nav__brand {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 9px;
  color: inherit;
  text-decoration: none;
}
.tx-global-tool-nav__brand img { width: 40px; height: 40px; object-fit: contain; }
.tx-global-tool-nav__brand span { min-width: 0; display: grid; gap: 1px; }
.tx-global-tool-nav__brand strong { color: #1d211e; font-size: 15px; line-height: 1.1; }
.tx-global-tool-nav__brand strong,
.tx-global-tool-nav__brand small { white-space: nowrap; word-break: keep-all; writing-mode: horizontal-tb; }
.tx-global-tool-nav__brand small { color: #6e756f; font-size: 9px; }
.tx-global-tool-nav__links {
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(9px,1.2vw,18px);
  overflow-x: auto;
  scrollbar-width: none;
}
.tx-global-tool-nav__links::-webkit-scrollbar { display: none; }
.tx-global-tool-nav__links a,
.tx-global-tool-nav__checkin,
.tx-global-tool-nav__learn {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  padding: 0 4px;
  color: #626963;
  border-radius: 7px;
  font-size: 12px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  word-break: keep-all;
  writing-mode: horizontal-tb;
  text-orientation: mixed;
  flex: 0 0 auto;
}
.tx-global-tool-nav__links a:hover,
.tx-global-tool-nav__links a.is-active { color: #1e624c; background: #edf4f0; }
.tx-global-tool-nav__actions { display: flex; align-items: center; gap: 9px; }
.tx-global-tool-nav__checkin {
  min-height: 36px;
  padding: 0 10px;
  color: #24634f;
  border: 1px solid rgba(36,99,79,.22);
  background: #f2f7f4;
}
.tx-global-tool-nav__learn {
  min-height: 38px;
  padding: 0 15px;
  color: #fff;
  background: #24634f;
}
.tx-global-tool-nav [data-global-theme-slot] { display: grid; place-items: center; }
.tx-global-tool-nav .tx-global-theme-toggle {
  position: static !important;
  inset: auto !important;
  width: 44px !important;
  min-width: 44px !important;
  height: 44px !important;
  min-height: 44px !important;
  margin: 0 !important;
  padding: 0 !important;
  display: grid !important;
  place-items: center !important;
  color: #252b27 !important;
  border: 1px solid #d9dfda !important;
  border-radius: 8px !important;
  background: #fff !important;
  box-shadow: none !important;
}

/* OP-20260803-309: local tool headers live inside capped shells. Viewport-based
   padding grows beyond their containing block at low browser zoom, so align
   against the header's own width and keep the border box inside the page. */
body.tx-has-global-tool-nav.tx-tool .topbar:not(.tx-global-tool-nav) {
  box-sizing: border-box !important;
  width: 100% !important;
  max-width: 100% !important;
  padding-inline: max(18px,calc((100% - var(--density-shell-tool,1125px))/2)) !important;
}

html[data-theme="night"] .tx-global-tool-nav,
html[data-theme="dark"] .tx-global-tool-nav {
  color: #f1f3ef;
  background: rgba(15,17,16,.94);
  border-bottom-color: rgba(255,255,255,.12);
  box-shadow: 0 6px 22px rgba(0,0,0,.24);
}
html[data-theme="night"] .tx-global-tool-nav__brand strong,
html[data-theme="dark"] .tx-global-tool-nav__brand strong { color: #f5f6f3; }
html[data-theme="night"] .tx-global-tool-nav__brand small,
html[data-theme="dark"] .tx-global-tool-nav__brand small,
html[data-theme="night"] .tx-global-tool-nav__links a,
html[data-theme="dark"] .tx-global-tool-nav__links a { color: #aeb5af; }
html[data-theme="night"] .tx-global-tool-nav__checkin,
html[data-theme="dark"] .tx-global-tool-nav__checkin { color: #dcebe4; border-color: #37584b; background: #1b3028; }
html[data-theme="night"] .tx-global-tool-nav__links a:hover,
html[data-theme="night"] .tx-global-tool-nav__links a.is-active,
html[data-theme="dark"] .tx-global-tool-nav__links a:hover,
html[data-theme="dark"] .tx-global-tool-nav__links a.is-active { color: #f5f7f3; background: #22372f; }
html[data-theme="night"] .tx-global-tool-nav .tx-global-theme-toggle,
html[data-theme="dark"] .tx-global-tool-nav .tx-global-theme-toggle { color: #f5f5f3 !important; border-color: #39413c !important; background: #202421 !important; }

/* Existing public, member and student headers receive the same navigation density. */
.tx-global-nav-host.site-header { height: 58px !important; }
.tx-global-nav-host .nav {
  width: min(1440px,100%) !important;
  max-width: 1440px !important;
  height: 58px !important;
  padding-inline: 24px !important;
  gap: 18px;
}
.tx-global-nav-host .nav-links {
  min-width: 0;
  gap: clamp(9px,1.2vw,18px) !important;
  overflow-x: auto;
  scrollbar-width: none;
  font-size: 12px !important;
  white-space: nowrap;
}
.tx-global-nav-host .nav-links::-webkit-scrollbar { display: none; }
.tx-global-nav-host .tx-global-site-brand { min-width: 0; display: flex; align-items: center; gap: 9px; color: inherit; text-decoration: none; }
.tx-global-nav-host .tx-global-site-brand > img { width: 40px !important; min-width: 40px; height: 40px !important; max-height: 40px; object-fit: contain; flex: 0 0 40px; }
.tx-global-nav-host .tx-global-site-brand > span { min-width: 0; display: grid; gap: 1px; }
.tx-global-nav-host .tx-global-site-brand strong { color: #1d211e; font-size: 15px; line-height: 1.1; }
.tx-global-nav-host .tx-global-site-brand small { color: #6e756f; font-size: 9px; white-space: nowrap; }
html[data-theme="night"] .tx-global-nav-host .tx-global-site-brand strong,
html[data-theme="dark"] .tx-global-nav-host .tx-global-site-brand strong { color: #f5f6f3; }
html[data-theme="night"] .tx-global-nav-host .tx-global-site-brand small,
html[data-theme="dark"] .tx-global-nav-host .tx-global-site-brand small { color: #aeb5af; }
.tx-global-nav-host .nav-links > a { flex: none; display: inline-flex !important; align-items: center; }
.tx-global-nav-host .nav-links > a,
.tx-global-nav-host .tx-global-site-brand strong,
.tx-global-nav-host .tx-global-site-brand small { white-space: nowrap !important; word-break: keep-all !important; writing-mode: horizontal-tb !important; text-orientation: mixed; }
.tx-global-nav-host .nav-links > a.is-active { color: var(--tx-jade,#24634f) !important; }
.tx-global-nav-host .nav-links > .tx-global-checkin {
  min-height: 36px;
  padding-inline: 10px;
  color: #24634f;
  border: 1px solid rgba(36,99,79,.22);
  border-radius: 8px;
  background: #f2f7f4;
}
html[data-theme="night"] .tx-global-nav-host .nav-links > .tx-global-checkin,
html[data-theme="dark"] .tx-global-nav-host .nav-links > .tx-global-checkin { color: #dcebe4; border-color: #37584b; background: #1b3028; }
.tx-global-nav-host .tx-global-theme-toggle {
  position: static !important;
  inset: auto !important;
  flex: 0 0 44px;
  width: 44px !important;
  min-width: 44px !important;
  height: 44px !important;
  min-height: 44px !important;
  margin: 0 !important;
}
.tx-global-theme-toggle::after { display: none !important; }

/* The canvas remains viewport-filling without editing its separately maintained source files. */
body.tx-has-global-tool-nav.tx-tool-video {
  height: 100dvh;
  display: grid !important;
  grid-template-rows: auto auto minmax(0,1fr);
  overflow: hidden;
}
body.tx-has-global-tool-nav.tx-tool-video .flow-app { height: auto !important; min-height: 0; }

@media (max-width: 1180px) {
  .tx-global-tool-nav > nav { grid-template-columns: minmax(145px,auto) minmax(0,1fr) auto; gap: 10px; padding-inline: 16px; }
  .tx-global-tool-nav__brand small,
  .tx-global-nav-host .brand-copy small { display: none; }
  .tx-global-nav-host .nav { padding-inline: 16px !important; gap: 10px; }
}

@media (max-width: 900px) {
  .tx-global-tool-nav,
  .tx-global-nav-host.site-header { height: 102px !important; }
  .tx-global-tool-nav > nav,
  .tx-global-nav-host .nav {
    height: 102px !important;
    display: grid !important;
    grid-template-columns: minmax(0,1fr) auto;
    grid-template-rows: 56px 42px;
    gap: 0 10px;
    padding: 0 12px 4px !important;
  }
  .tx-global-tool-nav__brand,
  .tx-global-nav-host .brand { grid-column: 1; grid-row: 1; }
  .tx-global-tool-nav__actions { grid-column: 2; grid-row: 1; }
  .tx-global-tool-nav__links,
  .tx-global-nav-host .nav-links {
    grid-column: 1 / -1;
    grid-row: 2;
    width: 100%;
    justify-content: flex-start;
    gap: 8px !important;
    overflow-x: auto !important;
  }
  .tx-global-tool-nav__links a,
  .tx-global-nav-host .nav-links > a:not(.btn) { min-height: 34px; padding: 0 9px; display: inline-flex !important; font-size: 12px; }
  .tx-global-nav-host .nav-links .tx-global-learn,
  .tx-global-nav-host .nav-links .tx-global-checkin,
  .tx-global-nav-host .nav-links .tx-global-theme-toggle { order: -1; }
}

@media (max-width: 560px) {
  .tx-global-tool-nav__brand img { width: 34px; height: 34px; }
  .tx-global-nav-host .tx-global-site-brand > img { width: 34px !important; min-width: 34px; height: 34px !important; max-height: 34px; flex-basis: 34px; }
  .tx-global-tool-nav__brand strong { font-size: 14px; }
  .tx-global-tool-nav__learn { min-height: 38px; padding-inline: 11px; font-size: 12px; }
  .tx-global-tool-nav__checkin { min-height: 36px; padding-inline: 8px; font-size: 12px; }
  .tx-global-tool-nav__actions { gap: 6px; }
  .tx-global-nav-host .nav-links > a:not(.btn) { display: inline-flex !important; }
}

@media print {
  .tx-global-tool-nav { display: none !important; }
}

/* UI Foundation v1 / phase 2: mobile navigation is a dedicated sheet, not a clipped desktop row. */
.txd-mobile-menu-toggle,
.txd-mobile-menu { display: none; }

@media (min-width: 901px) {
  .txd-desktop-nav { min-width: 0; }
  .txd-desktop-nav a:focus-visible,
  .txd-desktop-nav button:focus-visible { outline: 3px solid rgba(31,102,85,.28); outline-offset: 2px; }
  .tx-global-nav-host .nav-links > a.is-active,
  .tx-global-tool-nav__links > a.is-active { padding-inline: 9px; color: #1f6655 !important; background: #edf6f1; }
  html[data-theme="night"] .tx-global-nav-host .nav-links > a.is-active,
  html[data-theme="dark"] .tx-global-nav-host .nav-links > a.is-active,
  html[data-theme="night"] .tx-global-tool-nav__links > a.is-active,
  html[data-theme="dark"] .tx-global-tool-nav__links > a.is-active { color: #d6eddf !important; background: #22372f; }
}

@media (max-width: 620px) {
  body.txd-mobile-menu-open { overflow: hidden; }
  .tx-global-tool-nav,
  .tx-global-nav-host.site-header { height: 58px !important; }
  .tx-global-tool-nav > nav,
  .tx-global-nav-host .nav {
    height: 58px !important;
    grid-template-columns: minmax(0,1fr) auto auto !important;
    grid-template-rows: 58px !important;
    padding: 0 12px !important;
    align-items: center !important;
    gap: 8px !important;
  }
  .tx-global-tool-nav__brand,
  .tx-global-nav-host .brand { grid-column: 1 !important; grid-row: 1 !important; }
  .tx-global-tool-nav__actions,
  .tx-global-nav-host .nav-links {
    grid-column: 2 !important;
    grid-row: 1 !important;
    display: flex !important;
    align-items: center !important;
    flex: 0 0 auto;
    width: auto !important;
    min-width: 0;
    overflow: hidden !important;
    justify-content: flex-end;
    white-space: nowrap;
    gap: 6px !important;
  }
  .tx-global-tool-nav__links > a,
  .tx-global-nav-host .nav-links > a:not(.tx-global-learn):not(.tx-global-checkin):not(.tx-global-theme-toggle) { display: none !important; }
  .tx-global-nav-host .nav-links > .tx-global-checkin { display: none !important; }
  .tx-global-nav-host .nav-links > .tx-global-learn { flex: 0 1 auto; width: auto !important; min-width: 0; max-width: calc(100vw - 160px); white-space: nowrap !important; min-height: 36px !important; padding-inline: 10px !important; }
  .txd-mobile-menu-toggle {
    grid-column: 3 !important;
    grid-row: 1 !important;
    display: inline-flex !important;
    align-items: center;
    justify-content: center;
    gap: 5px;
    min-width: 40px;
    min-height: 38px;
    height: 38px;
    padding: 0 8px;
    border: 1px solid rgba(36,99,79,.24);
    border-radius: 8px;
    color: #24634f;
    background: #f2f7f4;
    font: 600 12px/1 inherit;
    cursor: pointer;
  }
  .txd-mobile-menu-toggle span { font-size: 18px; line-height: 1; }
  .txd-mobile-menu-toggle b { font-weight: 700; }
  html[data-theme="night"] .txd-mobile-menu-toggle,
  html[data-theme="dark"] .txd-mobile-menu-toggle { color: #dcebe4; border-color: #37584b; background: #1b3028; }
  /* Keep the sheet bound to the visual viewport: WeChat/iOS can clip an absolute top/bottom panel to its header host. */
  .txd-mobile-menu { position: fixed; inset: 0; z-index: 2000; display: block; width: 100vw; height: 100vh; height: 100dvh; overflow: hidden; isolation: isolate; }
  .txd-mobile-menu[hidden] { display: none; }
  .txd-mobile-menu__backdrop { position: fixed; inset: 0; background: rgba(8,12,10,.46); backdrop-filter: blur(3px); }
  .txd-mobile-menu__panel { position: fixed; inset: 0 0 0 auto; width: min(88vw,360px); height: 100vh; height: 100dvh; max-height: 100dvh; box-sizing: border-box; padding: calc(16px + var(--safe-top,0px)) 18px calc(20px + var(--safe-bottom,0px)); overflow-x: hidden; overflow-y: auto; -webkit-overflow-scrolling: touch; overscroll-behavior: contain; background: #f8faf7; border-left: 1px solid #d7e0d8; box-shadow: -12px 0 32px rgba(10,24,16,.18); animation: txd-menu-in .18s ease-out; }
  .txd-mobile-menu__head { display: flex; align-items: center; justify-content: space-between; padding-bottom: 16px; border-bottom: 1px solid #d7e0d8; }
  .txd-mobile-menu__head strong { color: #17221b; font-size: 20px; }
  .txd-mobile-menu__close { width: 44px; height: 44px; border: 1px solid #d7e0d8; border-radius: 8px; color: #36443b; background: #fff; font-size: 24px; cursor: pointer; }
  .txd-mobile-menu__links { display: grid; gap: 8px; padding-top: 16px; }
  .txd-mobile-menu__links a { min-height: 48px; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 0 14px; border: 1px solid #dfe7e0; border-radius: 10px; color: #243329; background: #fff; text-decoration: none; font-size: 15px; font-weight: 650; }
  .txd-mobile-menu__links a b { color: #6a786e; font-size: 22px; font-weight: 400; }
  .txd-mobile-menu__links a.is-active { color: #1f6655; border-color: #9bc1b1; background: #edf6f1; }
  html[data-theme="night"] .txd-mobile-menu__panel,
  html[data-theme="dark"] .txd-mobile-menu__panel { background: #141916; border-color: #2d3a31; }
  html[data-theme="night"] .txd-mobile-menu__head,
  html[data-theme="dark"] .txd-mobile-menu__head { border-color: #2d3a31; }
  html[data-theme="night"] .txd-mobile-menu__head strong,
  html[data-theme="dark"] .txd-mobile-menu__head strong { color: #f0f4f0; }
  html[data-theme="night"] .txd-mobile-menu__close,
  html[data-theme="dark"] .txd-mobile-menu__close,
  html[data-theme="night"] .txd-mobile-menu__links a,
  html[data-theme="dark"] .txd-mobile-menu__links a { color: #e7eee8; border-color: #35443a; background: #1d2520; }
  html[data-theme="night"] .txd-mobile-menu__links a.is-active,
  html[data-theme="dark"] .txd-mobile-menu__links a.is-active { color: #cce7d9; border-color: #477762; background: #20362a; }
}

@keyframes txd-menu-in { from { transform: translateX(18px); opacity: .7; } to { transform: translateX(0); opacity: 1; } }