/* ============================================
   layout.css — 通用布局与基础排版
   ============================================ */
body {
  font-family: var(--font-cn);
  color: var(--c-text);
  background: var(--c-bg);
  font-size: var(--fs-base);
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* 区块通用 */
.section {
  padding: var(--space-12) 0;
}

.section--gray {
  background: var(--c-bg-gray);
}

.section--light {
  background: var(--c-primary-ghost);
}

/* 区块标题 */
.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--space-10);
}

.section-head .eyebrow {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-accent);
  background: var(--c-accent-light);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.section-head h2 {
  font-size: var(--fs-2xl);
  color: var(--c-primary-deep);
  margin-bottom: var(--space-4);
}

.section-head h2 .accent {
  color: var(--c-accent);
}

.section-head p {
  color: var(--c-text-2);
  font-size: var(--fs-md);
}

/* 子区块标题（左对齐） */
.sub-head {
  margin-bottom: var(--space-6);
}

.sub-head h3 {
  font-size: var(--fs-xl);
  color: var(--c-primary-deep);
  margin-bottom: var(--space-2);
}

.sub-head p {
  color: var(--c-text-2);
  max-width: 640px;
}

/* 正文段落 */
.lead {
  font-size: var(--fs-md);
  color: var(--c-text-2);
}

/* ============================================
   顶栏 Topbar
   ============================================ */
.topbar {
  background: var(--c-primary-deep);
  color: rgba(255, 255, 255, 0.85);
  font-size: var(--fs-xs);
  height: var(--topbar-h);
  display: flex;
  align-items: center;
}

.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
}

.topbar-group {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.topbar-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.topbar-item svg {
  width: 14px;
  height: 14px;
  fill: var(--c-accent);
}

.topbar-item a:hover {
  color: var(--c-accent);
}

/* 语言切换 */
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-xs);
  padding: 3px 10px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--radius-full);
}

.lang-link {
  color: rgba(255, 255, 255, 0.75);
  transition: color var(--t-fast);
}

.lang-link:hover {
  color: var(--c-accent);
}

.lang-link.active {
  color: var(--c-accent);
  font-weight: 700;
}

.lang-sep {
  color: rgba(255, 255, 255, 0.4);
}

/* ============================================
   导航栏 Navbar
   ============================================ */
.navbar {
  background: var(--c-white);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: var(--space-4);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.logo-icon {
  width: auto;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-icon img {
  height: 100%;
  width: auto;
  display: block;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.logo-text strong {
  font-size: 1.2rem;
  color: var(--c-primary-deep);
  letter-spacing: 0.04em;
}

.logo-text small {
  font-size: 0.62rem;
  color: var(--c-text-3);
  font-family: var(--font-en);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* 导航菜单 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-link {
  display: block;
  padding: 10px 16px;
  font-size: var(--fs-base);
  color: var(--c-text);
  border-radius: var(--radius-sm);
  position: relative;
  transition: color var(--t-fast), background var(--t-fast);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 4px;
  height: 2px;
  background: var(--grad-accent);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-base);
}

.nav-link:hover {
  color: var(--c-primary);
  background: var(--c-primary-ghost);
}

.nav-link.active {
  color: var(--c-primary);
  font-weight: 600;
}

.nav-link.active::after {
  transform: scaleX(1);
}

/* 导航 CTA 按钮 */
.nav-cta {
  flex-shrink: 0;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--c-border);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  transition: border-color var(--t-fast);
}

.nav-toggle span {
  width: 20px;
  height: 2px;
  background: var(--c-primary-deep);
  border-radius: 2px;
  transition: transform var(--t-base), opacity var(--t-base);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================
   按钮
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: var(--fs-base);
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: transform var(--t-fast), box-shadow var(--t-fast), background var(--t-fast);
  white-space: nowrap;
}

.btn svg {
  width: 16px;
  height: 16px;
}

.btn-primary {
  background: var(--grad-blue);
  color: var(--c-white);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-accent {
  background: var(--grad-accent);
  color: var(--c-white);
  box-shadow: var(--shadow-accent);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(255, 122, 0, 0.42);
}

.btn-outline {
  border: 2px solid var(--c-primary);
  color: var(--c-primary);
  background: transparent;
}

.btn-outline:hover {
  background: var(--c-primary-light);
}

.btn-outline-light {
  border: 2px solid rgba(255, 255, 255, 0.7);
  color: var(--c-white);
  background: transparent;
}

.btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--c-white);
}

.btn-block {
  width: 100%;
}

/* ============================================
   页脚
   ============================================ */
.site-footer {
  background: var(--c-primary-deep);
  color: rgba(255, 255, 255, 0.72);
  font-size: var(--fs-sm);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1.2fr;
  gap: var(--space-8);
  padding: var(--space-10) 0;
}

.footer-brand .logo-text strong {
  color: var(--c-white);
}

.footer-brand .logo-text small {
  color: rgba(255, 255, 255, 0.5);
}

.footer-desc {
  margin-top: var(--space-4);
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.8;
}

.footer-title {
  font-size: var(--fs-md);
  color: var(--c-white);
  margin-bottom: var(--space-5);
  position: relative;
  padding-bottom: 10px;
}

.footer-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 2px;
  background: var(--c-accent);
  border-radius: 2px;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  transition: color var(--t-fast), padding-left var(--t-fast);
}

.footer-links a:hover {
  color: var(--c-accent);
  padding-left: 4px;
}

.footer-contact li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 12px;
}

.footer-contact svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  fill: var(--c-accent);
  margin-top: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: var(--space-5) 0;
  text-align: center;
  font-size: var(--fs-xs);
  color: rgba(255, 255, 255, 0.45);
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.65);
}

.footer-bottom a:hover {
  color: var(--c-accent);
}

/* 公安备案号：警徽图标与文字同行并垂直居中 */
.footer-bottom .beian-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  vertical-align: middle;
}
.footer-bottom .beian-link img {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* ============================================
   面包屑
   ============================================ */
.page-hero {
  background: var(--grad-hero);
  position: relative;
  overflow: hidden;
  padding: var(--space-10) 0;
  color: var(--c-white);
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}

.page-hero-inner {
  position: relative;
  z-index: 1;
}

.page-hero h1 {
  font-size: var(--fs-2xl);
  margin-bottom: var(--space-2);
}

.page-hero p {
  color: rgba(255, 255, 255, 0.75);
  max-width: 640px;
}

.breadcrumb {
  margin-top: var(--space-4);
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.6);
}

.breadcrumb a {
  color: rgba(255, 255, 255, 0.85);
}

.breadcrumb a:hover {
  color: var(--c-accent);
}

.breadcrumb .sep {
  margin: 0 8px;
  opacity: 0.5;
}

/* ============================================
   滚动动画（JS 控制 .reveal）
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ============================================
   回到顶部
   ============================================ */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 46px;
  height: 46px;
  border-radius: var(--radius-full);
  background: var(--grad-blue);
  color: var(--c-white);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity var(--t-base), transform var(--t-base), visibility var(--t-base);
  z-index: 90;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.back-to-top:hover {
  background: var(--c-primary-dark);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1023.98px) {
  .nav-toggle {
    display: flex;
  }

  .nav-cta {
    display: none;
  }

  .nav-menu {
    position: fixed;
    top: var(--topbar-h);
    right: 0;
    bottom: 0;
    width: min(320px, 84vw);
    background: var(--c-white);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 4px;
    padding: var(--space-6) var(--space-5);
    box-shadow: -8px 0 32px rgba(15, 60, 130, 0.15);
    transform: translateX(100%);
    transition: transform var(--t-base);
    overflow-y: auto;
  }

  .nav-menu.open {
    transform: none;
  }

  .nav-menu::before {
    content: "";
    position: fixed;
    inset: var(--topbar-h) 0 0 auto;
    width: min(320px, 84vw);
    height: 2px;
    background: var(--grad-accent);
    z-index: 101;
  }

  .nav-link {
    font-size: var(--fs-md);
    padding: 14px 16px;
    border-radius: var(--radius-md);
  }

  .nav-link::after {
    display: none;
  }

  .nav-link.active {
    background: var(--c-primary-light);
  }

  /* 遮罩 */
  .nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(6, 30, 70, 0.45);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--t-base), visibility var(--t-base);
    z-index: 95;
  }

  .nav-overlay.show {
    opacity: 1;
    visibility: visible;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
}

@media (max-width: 767.98px) {
  .topbar-group {
    width: 100%;
    justify-content: space-between;
  }

  .topbar-item--hide-sm {
    display: none;
  }

  .section {
    padding: var(--space-8) 0;
  }

  .section-head {
    margin-bottom: var(--space-8);
  }

  .section-head h2 {
    font-size: 1.6rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
    padding: var(--space-8) 0;
  }

  .logo-text strong {
    font-size: 1.05rem;
  }

  .logo-text small {
    display: none;
  }

  .logo-icon {
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 575.98px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
}