:root {
  --brand-orange: #ff6a00;
  --brand-orange-light: #ff8b33;
  --brand-dark: #0d1c2e;
  --text-muted: #5f6b7a;
  --border-color: rgba(13, 28, 46, 0.08);
  --panel-bg: #ffffff;
  --panel-shadow: 0 24px 60px rgba(14, 24, 45, 0.1);
  --radius-lg: 20px;
  --radius-md: 12px;
  --radius-sm: 8px;
}

*, *::before, *::after {
  box-sizing: border-box;
}

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

.global-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(13, 28, 46, 0.05);
  box-shadow: 0 12px 30px rgba(13, 28, 46, 0.08);
}

.global-header::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(90deg, rgba(255, 106, 0, 0.12), transparent, rgba(255, 106, 0, 0.12));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.global-header.panel-active::after {
  opacity: 1;
}

.header-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  position: relative;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--brand-dark);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.brand img {
  height: 48px;
  width: auto;
  max-width: 180px;
  object-fit: contain;
}

.primary-navigation ul {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 0;
  padding: 0;
}

.primary-navigation a,
.primary-navigation button {
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  background: none;
  padding: 10px 14px;
  border-radius: 999px;
  cursor: pointer;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.primary-navigation a:hover,
.primary-navigation button:hover,
.primary-navigation a:focus-visible,
.primary-navigation button:focus-visible {
  color: var(--brand-dark);
}

.primary-navigation li {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 44px;
}

.primary-navigation li::before {
  content: "";
  position: absolute;
  top: 50%;
  left: -8px;
  right: -8px;
  height: 44px;
  transform: translateY(-50%);
  border: 1.5px solid transparent;
  border-radius: 10px;
  pointer-events: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.primary-navigation li:hover::before,
.primary-navigation li:focus-within::before {
  border-color: rgba(0, 0, 0, 0.08);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.5) inset, 0 1px 2px rgba(0, 0, 0, 0.05);
}

/* 移除浏览器默认的 focus-visible 样式 */
.primary-navigation button:focus-visible {
  outline: none;
}

.nav-item.has-panel button::after {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  margin-left: 6px;
  transition: transform 0.2s ease;
}

.nav-item.has-panel[aria-expanded="true"] button::after,
.nav-item.has-panel button[aria-expanded="true"]::after {
  transform: rotate(-135deg);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn.primary {
  background: linear-gradient(135deg, var(--brand-orange), var(--brand-orange-light));
  color: #fff;
  box-shadow: 0 10px 20px rgba(255, 106, 0, 0.3);
}

.btn.primary:hover {
  transform: translateY(-2px);
}

.btn.ghost {
  border: 1px solid rgba(255, 106, 0, 0.5);
  color: var(--brand-orange);
  background: transparent;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  width: 44px;
  height: 44px;
  border-radius: 999px;
  border: 1px solid rgba(13, 28, 46, 0.1);
  background: #fff;
  cursor: pointer;
  justify-content: center;
  align-items: center;
  transition: border-color 0.2s ease;
}

.nav-toggle span[aria-hidden="true"] {
  width: 18px;
  height: 2px;
  background: var(--brand-dark);
  border-radius: 999px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.global-header.nav-open .nav-toggle span:nth-child(2) {
  transform: translateY(4px) rotate(45deg);
}

.global-header.nav-open .nav-toggle span:nth-child(3) {
  opacity: 0;
}

.global-header.nav-open .nav-toggle span:nth-child(4) {
  transform: translateY(-4px) rotate(-45deg);
}

.nav-panels {
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  height: 0;
  pointer-events: none;
  overflow: visible;
}

.global-header.panel-active .nav-panels {
  pointer-events: auto;
}

.nav-panel {
  display: none;
  position: absolute;
  top: 16px;
  left: var(--panel-left, 24px);
  width: min(920px, calc(100% - 48px));
  background: var(--panel-bg);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--panel-shadow);
  pointer-events: auto;
}

.nav-panel.measuring {
  display: block;
  visibility: hidden;
}

.nav-panel.is-visible {
  display: block;
}

.nav-panel .panel-body {
  display: flex;
  gap: 32px;
  justify-content: space-between;
}

.nav-panel article {
  flex: 1;
}

.panel-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--brand-orange);
  margin-bottom: 12px;
}

.nav-panel ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.nav-panel ul a {
  color: var(--brand-dark);
  text-decoration: none;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-panel ul a::after {
  content: "";
  width: 8px;
  height: 8px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(-45deg);
  opacity: 0;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-panel ul a:hover::after {
  opacity: 1;
  transform: translateX(2px) rotate(-45deg);
}

.panel-footer {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  color: var(--text-muted);
}

.panel-link {
  color: var(--brand-orange);
  text-decoration: none;
  font-weight: 600;
}

.nav-panel-detail {
  display: none;
  gap: 24px;
}

.nav-panel-detail.is-visible {
  display: flex;
}

.panel-detail-list {
  min-width: 240px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.detail-item {
  border: 1px solid rgba(13, 28, 46, 0.08);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  background: #fff;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.detail-item span {
  display: block;
  font-weight: 600;
  color: var(--brand-dark);
}

.detail-item em {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.detail-item.active {
  border-color: rgba(255, 106, 0, 0.5);
  background: rgba(255, 106, 0, 0.08);
  transform: translateX(4px);
}

.panel-detail-card {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(220px, 320px) 1fr;
  gap: 24px;
  align-items: center;
}

.panel-detail-card img {
  width: 100%;
  border-radius: var(--radius-md);
  object-fit: cover;
  box-shadow: 0 12px 30px rgba(13, 28, 46, 0.18);
}

.card-tag {
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand-orange);
  margin-bottom: 8px;
}

.panel-detail-card h3 {
  margin: 0 0 8px;
  font-size: 1.5rem;
  color: var(--brand-dark);
}

.panel-detail-card p {
  margin: 0 0 16px;
  color: var(--text-muted);
  line-height: 1.5;
}

.card-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

@media (max-width: 1100px) {
  .header-wrap {
    padding: 0 16px;
  }
  .primary-navigation ul {
    gap: 10px;
  }
  .header-cta {
    display: none;
  }
}

@media (max-width: 960px) {
  .header-wrap {
    flex-wrap: wrap;
    min-height: 64px;
  }

  .primary-navigation {
    width: 100%;
    order: 3;
    display: none;
  }

  .global-header.nav-open .primary-navigation {
    display: block;
  }

  .primary-navigation ul {
    flex-direction: column;
    align-items: flex-start;
    padding: 12px 0 16px;
  }

  .primary-navigation a,
  .primary-navigation button {
    width: 100%;
    justify-content: flex-start;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-panels {
    position: static;
    width: 100%;
    height: auto;
    padding: 0 0 16px;
  }

  .nav-panel,
  .nav-panel-detail {
    position: static;
    width: 100%;
    margin-top: 8px;
  }

  .panel-detail-card {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .brand span {
    font-size: 1rem;
  }
  .detail-item {
    padding: 12px;
  }
}