/* ── Layout ── */
.page-wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
}

.page-wrap-wide,
.container-wide {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.page-main {
  padding-top: calc(var(--nav-height) + var(--space-xl));
  padding-bottom: var(--space-2xl);
}

.section {
  padding: var(--space-2xl) 0;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-xl);
}

.section-header .eyebrow {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: var(--color-primary-muted);
}

.section-header h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.03em;
}

.section-header p {
  color: var(--color-muted);
  font-size: var(--text-lg);
  margin: 0;
}

/* ── Navigation (WorkBuddy-style) ── */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  height: var(--nav-height);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration-normal), box-shadow var(--duration-normal);
}

/* backdrop-filter 放在伪元素上，避免 fixed 子菜单被限制在导航条高度内 */
.site-nav::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--color-nav-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid transparent;
  transition: background var(--duration-normal), border-color var(--duration-normal), box-shadow var(--duration-normal);
  pointer-events: none;
}

.site-nav.is-scrolled {
  border-bottom-color: var(--color-border-light);
  box-shadow: var(--shadow-xs);
}

.site-nav.is-scrolled::before {
  background: var(--color-nav-bg-scrolled);
  border-bottom-color: var(--color-border-light);
  box-shadow: var(--shadow-xs);
}

.site-nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.site-brand {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  text-decoration: none;
}

.site-brand:hover { color: var(--color-text); }

.site-brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
}

.site-brand-text {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.site-brand img { height: 28px; width: auto; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  position: relative;
  z-index: calc(var(--z-overlay) + 2);
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--duration-normal), opacity var(--duration-normal);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-menu {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  margin-left: auto;
  min-width: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  display: block;
  padding: 8px 14px;
  color: var(--color-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-full);
  transition: color var(--duration-fast), background var(--duration-fast);
}

.nav-links a:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

.nav-links a.active {
  color: var(--color-primary);
  background: var(--color-primary-muted);
  font-weight: 600;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav-login-link {
  display: inline-flex;
  align-items: center;
  padding: 6px 4px;
  color: var(--color-text);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}
.nav-login-link:hover {
  color: var(--color-primary);
  text-decoration: none;
}

/* WorkBuddy-style user avatar menu */
.nav-user {
  position: relative;
  display: inline-flex;
  align-items: center;
}
.nav-user__trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  margin: 0;
  border: 2px solid transparent;
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
  line-height: 0;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.nav-user__trigger:hover,
.nav-user__trigger[aria-expanded="true"] {
  border-color: var(--color-border);
  box-shadow: 0 0 0 3px var(--color-primary-muted);
}
.nav-user__avatar {
  width: 36px;
  height: 36px;
  border-radius: 999px;
  object-fit: cover;
  display: block;
  background: var(--color-surface-2);
}
.nav-user__dropdown {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 120;
  min-width: 220px;
  padding: 6px 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  box-shadow: var(--shadow-card);
}
.nav-user__dropdown[hidden] {
  display: none !important;
}
.nav-user__identity {
  padding: 12px 16px 10px;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nav-user__sep {
  height: 1px;
  margin: 4px 0;
  background: var(--color-border);
}
.nav-user__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  color: var(--color-text);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s ease;
}
.nav-user__item:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
  text-decoration: none;
}
.nav-user__item svg {
  flex-shrink: 0;
  opacity: 0.75;
}
.nav-user__item--danger {
  color: var(--color-text-secondary);
}
.nav-user__item--danger:hover {
  color: var(--color-danger);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: inherit;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--duration-fast), border-color var(--duration-fast),
    color var(--duration-fast), transform var(--duration-fast), box-shadow var(--duration-fast);
}

.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }

.btn-sm { padding: 7px 14px; font-size: var(--text-xs); }
.btn-lg { padding: 14px 28px; font-size: var(--text-base); }
.btn-block { width: 100%; }

.btn-primary {
  background: var(--color-primary-bright);
  color: var(--color-btn-dark);
  border-color: var(--color-primary-bright);
  box-shadow: 0 2px 8px rgba(40, 184, 148, 0.25);
}
.btn-primary:hover {
  color: var(--color-btn-dark);
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  box-shadow: 0 4px 16px rgba(40, 184, 148, 0.3);
}

.btn-download {
  background: var(--color-btn-dark);
  color: #fff;
  border-color: var(--color-btn-dark);
}
.btn-download:hover {
  color: #fff;
  background: #333;
  border-color: #333;
}

[data-theme="dark"] .btn-download {
  background: var(--color-surface-2);
  color: var(--color-text);
  border-color: var(--color-border);
}
[data-theme="dark"] .btn-download:hover {
  background: var(--color-surface-3);
  color: var(--color-text);
}

.btn-secondary {
  background: var(--color-btn-dark);
  color: #fff;
  border-color: var(--color-btn-dark);
}
.btn-secondary:hover {
  color: #fff;
  background: #333;
  border-color: #333;
}

[data-theme="dark"] .btn-secondary {
  background: var(--color-surface-2);
  color: var(--color-text);
  border-color: var(--color-border);
}
[data-theme="dark"] .btn-secondary:hover {
  background: var(--color-surface-3);
  color: var(--color-text);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-hover);
  background: var(--color-primary-muted);
}

.btn-ghost {
  background: transparent;
  color: var(--color-muted);
  border-color: transparent;
}
.btn-ghost:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

.btn-accent {
  background: rgba(34, 211, 238, 0.12);
  color: var(--color-accent);
  border-color: rgba(34, 211, 238, 0.35);
}
.btn-accent:hover {
  background: rgba(34, 211, 238, 0.2);
  color: var(--color-accent);
}

.actions { display: flex; flex-wrap: wrap; gap: var(--space-sm); }
.actions-center { justify-content: center; }

/* ── Cards ── */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.card-title {
  margin: 0 0 var(--space-md);
  font-size: var(--text-xl);
  font-weight: 700;
}

.card-flat {
  background: var(--color-surface-2);
  box-shadow: none;
}

.card-glow {
  border-color: rgba(99, 102, 241, 0.35);
  box-shadow: var(--shadow-glow);
}

/* ── Badges ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  background: var(--color-primary-muted);
  color: var(--color-primary);
  border: 1px solid transparent;
}

.badge-accent {
  background: var(--color-accent-muted);
  color: var(--color-accent);
  border-color: rgba(34, 211, 238, 0.25);
}

/* ── Alerts ── */
.alert {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  font-size: var(--text-sm);
}
.alert-success { background: rgba(34, 197, 94, 0.1); border-color: rgba(34, 197, 94, 0.3); }
.alert-danger { background: rgba(239, 68, 68, 0.1); border-color: rgba(239, 68, 68, 0.3); }
.alert-info { background: var(--color-primary-muted); border-color: rgba(99, 102, 241, 0.35); }
.alert-warning { background: rgba(245, 158, 11, 0.1); border-color: rgba(245, 158, 11, 0.3); }

/* ── Forms (public pages) ── */
.form-group { margin-bottom: var(--space-md); }
.form-label {
  display: block;
  margin-bottom: 6px;
  font-size: var(--text-sm);
  color: var(--color-muted);
  font-weight: 500;
}
.form-control,
.form-select {
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text);
  font-size: var(--text-sm);
  font-family: inherit;
}
.form-control:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

/* ── Footer ── */
.site-footer-block {
  border-top: 1px solid var(--color-border-light);
  background: var(--color-bg-elevated);
  padding: var(--space-2xl) 0 var(--space-lg);
  margin-top: auto;
}

.site-footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.footer-brand p {
  color: var(--color-muted);
  font-size: var(--text-sm);
  margin-top: var(--space-md);
  max-width: 280px;
}

.footer-col h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-col li {
  margin-bottom: var(--space-sm);
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.footer-col a { color: var(--color-muted); }
.footer-col a:hover { color: var(--color-text); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-sm);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border-light);
  font-size: var(--text-xs);
  color: var(--color-muted);
}

/* ── Utilities ── */
.text-muted { color: var(--color-muted); }
.text-center { text-align: center; }
.text-sm { font-size: var(--text-sm); }
.mt-2 { margin-top: var(--space-sm); }
.mt-3 { margin-top: var(--space-md); }
.mt-4 { margin-top: var(--space-lg); }
.mb-0 { margin-bottom: 0; }

/* ── Mobile nav ── */
@media (max-width: 900px) {
  .site-nav-inner {
    position: relative;
    z-index: calc(var(--z-overlay) + 1);
  }

  .nav-toggle { display: flex; }

  .site-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: var(--z-overlay);
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-md);
    padding: var(--space-lg);
    padding-bottom: calc(var(--space-lg) + env(safe-area-inset-bottom, 0px));
    background: var(--color-nav-bg-scrolled);
    border-top: 1px solid var(--color-border-light);
    transform: translateX(100%);
    transition: transform var(--duration-normal) var(--ease-out), visibility var(--duration-normal);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    pointer-events: none;
    visibility: hidden;
  }

  .site-menu.is-open {
    transform: translateX(0);
    pointer-events: auto;
    visibility: visible;
  }

  .nav-links {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav-links li {
    margin: 0;
    padding: 0;
  }

  .nav-links a {
    padding: 14px 16px;
    font-size: var(--text-base);
    border-radius: var(--radius-md);
    -webkit-tap-highlight-color: transparent;
  }

  .nav-actions {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-sm);
    padding-top: var(--space-md);
    margin-top: auto;
    border-top: 1px solid var(--color-border-light);
  }

  .nav-actions .theme-toggle {
    align-self: flex-start;
  }

  .nav-actions .btn { width: 100%; }

  .nav-actions .nav-login-link {
    padding: 12px 4px;
    font-size: var(--text-base);
  }

  .nav-user {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
  }
  .nav-user__trigger {
    align-self: flex-start;
  }
  .nav-user__dropdown {
    position: static;
    top: auto;
    right: auto;
    margin-top: 8px;
    min-width: 0;
    width: 100%;
    box-shadow: none;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }

  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}