/* Site shell — portal / content pages (no Tailwind) */

.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

body.site-page {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  color: #1f2937;
  background: #f9fafb;
}

body.site-page--hub {
  height: 100vh;
  min-height: 100vh;
  overflow: hidden;
}

.site-header {
  background: #fff;
  border-bottom: 1px solid #f3f4f6;
  position: relative;
  z-index: 40;
}

.site-header--sticky {
  position: sticky;
  top: 0;
  z-index: 50;
}

.site-header--shrink {
  flex-shrink: 0;
}

.site-header-inner {
  box-sizing: border-box;
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 16px;
  height: 4rem;
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

@media (min-width: 640px) {
  .site-header-inner {
    padding-left: 24px;
    padding-right: 24px;
  }
}

@media (min-width: 768px) {
  .site-header-inner {
    gap: 32px;
  }
}

@media (min-width: 1024px) {
  .site-header-inner {
    padding-left: 32px;
    padding-right: 32px;
  }
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  min-width: 0;
  max-width: 58vw;
  text-decoration: none;
  color: inherit;
}

@media (min-width: 640px) {
  .site-brand {
    max-width: none;
  }
}

.site-logo {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #2563eb;
  color: #fff;
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transition: background-color 0.15s ease;
}

.site-brand:hover .site-logo {
  background: #1d4ed8;
}

.site-title,
.site-name.site-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: #111827;
  letter-spacing: -0.025em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

@media (min-width: 640px) {
  .site-title,
  .site-name.site-title {
    font-size: 1.25rem;
  }
}

.site-back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  font-size: 14px;
  color: #4b5563;
  text-decoration: none;
}

.site-back-link:hover {
  color: #2563eb;
}

.site-nav-main {
  display: none;
}

@media (min-width: 768px) {
  .site-nav-main {
    display: flex;
    align-items: center;
    gap: 2rem;
    font-size: 15px;
    font-weight: 500;
    color: #4b5563;
  }
}

#site-header-mobile-slot.site-header-mobile-slot,
.site-header-mobile-slot {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
  margin-left: auto;
}

@media (min-width: 768px) {
  #site-header-mobile-slot.site-header-mobile-slot,
  .site-header-mobile-slot {
    display: none;
  }
}

.site-main {
  flex: 1;
  box-sizing: border-box;
  width: 100%;
}

.site-main--hub {
  display: flex;
  flex-direction: column;
  width: 0;
  min-width: 0;
  overflow: hidden;
  background: #f9fafb;
}

.site-main--scroll {
  overflow-y: auto;
}

.site-hub-layout {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

.auth-head-title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
  color: #111827;
}

.auth-head-sub {
  margin: 0.5rem 0 0;
  font-size: 14px;
  color: #6b7280;
}

.auth-field-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: #374151;
  margin-bottom: 6px;
}

.auth-footer-link {
  color: #2563eb;
  font-weight: 600;
  text-decoration: none;
}

.auth-footer-link:hover {
  text-decoration: underline;
}

.about-hero-title {
  margin: 0 0 1rem;
  font-size: 1.875rem;
  font-weight: 700;
  color: #111827;
}

.about-hero-lead {
  margin: 0 auto;
  max-width: 42rem;
  font-size: 1.125rem;
  color: #4b5563;
}

.about-feature-title {
  margin: 0 0 4px;
  font-weight: 700;
  color: #111827;
}

.about-feature-desc {
  margin: 0;
  font-size: 14px;
  color: #4b5563;
}

.content-hero-title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
  color: #111827;
  display: flex;
  align-items: center;
  gap: 12px;
}

.content-section-title {
  margin: 0 0 1rem;
  font-size: 1rem;
  font-weight: 600;
  color: #111827;
}

.admin-page-head-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  color: #111827;
}

.admin-page-head-sub {
  margin: 0.25rem 0 0;
  font-size: 14px;
  color: #6b7280;
}

.admin-field-label {
  color: #4b5563;
}

.instruct-bg-select-wrap {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.instruct-bg-select-wrap.hidden {
  display: none;
}

.site-main--narrow {
  max-width: 56rem;
  margin: 0 auto;
  padding: 2.5rem 16px;
}

.site-main--content {
  max-width: 48rem;
  margin: 0 auto;
  padding: 2.5rem 16px;
}

.site-main--about {
  max-width: 56rem;
  margin: 0 auto;
  padding: 4rem 16px;
}

@media (min-width: 640px) {
  .site-main--narrow,
  .site-main--content,
  .site-main--about {
    padding-left: 24px;
    padding-right: 24px;
  }
}

@media (min-width: 1024px) {
  .site-main--narrow,
  .site-main--content,
  .site-main--about {
    padding-left: 32px;
    padding-right: 32px;
  }
}

.site-main--center {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.site-card {
  background: #fff;
  border: 1px solid #f3f4f6;
  border-radius: 1rem;
  padding: 2rem;
}

.site-card--shadow {
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.site-card--center {
  text-align: center;
  font-size: 14px;
  color: #6b7280;
}

/* Auth bar (desktop) */
#auth-status.site-auth-bar {
  display: none;
  align-items: center;
  gap: 12px;
  margin-left: auto;
  font-size: 14px;
}

@media (min-width: 768px) {
  #auth-status.site-auth-bar {
    display: flex;
  }
}

.site-auth-link {
  font-size: 14px;
  color: #4b5563;
  text-decoration: none;
  transition: color 0.15s ease;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  font-family: inherit;
}

.site-auth-link:hover {
  color: #2563eb;
}

.site-auth-link--admin {
  color: #2563eb;
}

.site-auth-link--admin:hover {
  color: #1d4ed8;
}

.site-auth-user {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: #4b5563;
  text-decoration: none;
  transition: color 0.15s ease;
}

.site-auth-user:hover {
  color: #2563eb;
}

.site-mobile-login-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  height: 2.5rem;
  padding: 0 12px;
  font-size: 14px;
  font-weight: 500;
  color: #2563eb;
  border: 1px solid #bfdbfe;
  border-radius: 999px;
  background: #eff6ff;
  text-decoration: none;
  transition: background-color 0.15s ease;
}

.site-mobile-login-btn:hover {
  background: #dbeafe;
}

.site-nav-menu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: none;
  border-radius: 0.5rem;
  background: transparent;
  color: #4b5563;
  cursor: pointer;
}

.site-nav-menu-btn:hover {
  background: #f3f4f6;
}

.site-nav-strip {
  border-top: 1px solid #f3f4f6;
  background: rgba(255, 255, 255, 0.98);
}

/* Mobile drawer */
#site-nav-backdrop.site-nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

#site-nav-backdrop.site-nav-backdrop.is-open {
  opacity: 1;
  pointer-events: auto;
}

#site-nav-panel.site-nav-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 210;
  display: flex;
  flex-direction: column;
  width: min(calc(100vw - 2rem), 20rem);
  max-width: 100%;
  background: #fff;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  transform: translateX(100%);
  transition: transform 0.2s ease-out;
}

@media (min-width: 768px) {
  #site-nav-panel.site-nav-panel {
    display: none;
  }
  #site-nav-backdrop.site-nav-backdrop {
    display: none;
  }
}

#site-nav-panel.site-nav-panel.is-open {
  transform: translateX(0);
}

.site-nav-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #f3f4f6;
  padding: 12px 16px;
}

.site-nav-panel-title {
  font-weight: 600;
  color: #111827;
}

.site-nav-panel-close {
  border: none;
  border-radius: 0.5rem;
  padding: 8px;
  background: transparent;
  color: #6b7280;
  cursor: pointer;
}

.site-nav-panel-close:hover {
  background: #f3f4f6;
}

#site-nav-mobile-auth.site-nav-mobile-auth {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

.site-mobile-auth-stack {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.site-mobile-auth-box {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.site-mobile-auth-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  height: 48px;
  padding: 0 16px;
  border: 1px solid #dbeafe;
  border-radius: 0.5rem;
  background: #eff6ff;
  color: #1d4ed8;
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  text-decoration: none;
  box-sizing: border-box;
  cursor: pointer;
  appearance: none;
  font-family: inherit;
}

.site-mobile-auth-btn:hover {
  background: #dbeafe;
}

.site-mobile-auth-btn--outline {
  border-color: #e5e7eb;
  background: #fff;
  color: #374151;
}

.site-mobile-auth-btn--outline:hover {
  background: #f9fafb;
}

.site-mobile-auth-btn--primary {
  border-color: #2563eb;
  background: #2563eb;
  color: #fff;
}

.site-mobile-auth-btn--primary:hover {
  background: #1d4ed8;
}

.site-mobile-auth-btn--spaced {
  margin-top: 16px;
}

#site-nav-mobile-auth .site-mobile-auth-btn i {
  color: #2563eb;
  font-size: 1rem;
}

.site-chat-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: #6b7280;
  text-decoration: none;
  transition: color 0.15s ease;
}

.site-chat-link:hover {
  color: #2563eb;
}

.tb-chat-unread {
  position: absolute;
  top: -6px;
  right: -8px;
  display: none;
  align-items: center;
  justify-content: center;
  min-width: 1rem;
  height: 1rem;
  padding: 0 4px;
  border-radius: 999px;
  background: #ef4444;
  color: #fff;
  font-size: 10px;
  font-weight: 600;
  line-height: 1;
}

.tb-chat-unread:not(.hidden) {
  display: inline-flex;
}

@media (max-width: 767px) {
  body.tb-admin-private .site-header-inner .site-title,
  body.tb-admin-private .site-header-inner h1 {
    flex: 1;
    min-width: 0;
  }
}