/* ========================================
   合芯智汇科技 - 全站公共样式
   含：CSS变量、Reset、排版、导航、页脚、通用组件
======================================== */

/* ---------- CSS 变量 ---------- */
:root {
  /* 主题色 */
  --color-primary: #0A2E5C;        /* 深邃科技蓝 */
  --color-accent: #0066FF;         /* 电光蓝 */
  --color-accent-2: #00C6FF;       /* 渐变辅色 */
  --color-white: #FFFFFF;
  --color-bg: #F5F7FA;             /* 浅灰背景 */
  --color-text: #1A1A1A;           /* 深灰文字 */
  --color-text-light: #5A6B7E;     /* 次级文字 */
  --color-text-muted: #94A3B8;     /* 弱化文字 */
  --color-border: #E5EAF0;         /* 边框色 */
  --color-mask: rgba(10, 46, 92, 0.55); /* 遮罩 */

  /* 渐变 */
  --gradient-primary: linear-gradient(135deg, #0066FF, #00C6FF);
  --gradient-deep: linear-gradient(135deg, #0A2E5C, #0066FF);
  --gradient-overlay: linear-gradient(180deg, rgba(10,46,92,0) 0%, rgba(10,46,92,0.85) 100%);

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(10, 46, 92, 0.06);
  --shadow-md: 0 8px 24px rgba(10, 46, 92, 0.10);
  --shadow-lg: 0 16px 48px rgba(10, 46, 92, 0.16);
  --shadow-accent: 0 8px 24px rgba(0, 102, 255, 0.28);

  /* 字体 */
  --font-heading: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "HarmonyOS Sans SC", sans-serif;

  /* 间距 / 尺寸 */
  --container: 1200px;
  --header-h: 72px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* 动效 */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --transition: 0.3s var(--ease);
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.7;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
  border: 0;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

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

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  outline: none;
}

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
  outline: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-primary);
}

/* ---------- 通用容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
}

.section-sm {
  padding: 64px 0;
}

/* ---------- 区块标题 ---------- */
.section-head {
  text-align: center;
  margin-bottom: 56px;
}

.section-head .eyebrow {
  display: inline-block;
  font-size: 14px;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 12px;
  text-transform: uppercase;
}

.section-head h2 {
  font-size: 38px;
  letter-spacing: 0.02em;
  margin-bottom: 16px;
  position: relative;
  display: inline-block;
}

.section-head h2::after {
  content: "";
  display: block;
  width: 48px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: 2px;
  margin: 18px auto 0;
}

.section-head p {
  color: var(--color-text-light);
  font-size: 16px;
  max-width: 640px;
  margin: 0 auto;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 30px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition);
  white-space: nowrap;
  cursor: pointer;
  border: 1px solid transparent;
}

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

.btn-primary:hover {
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(0, 102, 255, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn-outline:hover {
  background: var(--color-accent);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-white {
  background: var(--color-white);
  color: var(--color-primary);
}

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

.btn-ghost {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.3);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.2);
  color: var(--color-white);
}

.btn-lg {
  padding: 16px 38px;
  font-size: 16px;
}

.btn .arrow {
  transition: transform var(--transition);
}

.btn:hover .arrow {
  transform: translateX(4px);
}

/* ---------- 文本链接 ---------- */
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-accent);
  font-size: 14px;
  font-weight: 500;
  transition: gap var(--transition);
}

.text-link:hover {
  gap: 12px;
  color: var(--color-accent);
}

/* ---------- 通用卡片 ---------- */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid var(--color-border);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  background: var(--color-bg);
  padding: 22px 0;
  padding-top: calc(var(--header-h) + 22px);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb ul {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-light);
}

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

.breadcrumb li.current {
  color: var(--color-primary);
  font-weight: 500;
}

.breadcrumb .sep {
  color: var(--color-text-muted);
  font-size: 12px;
}

/* ---------- 页面横幅（内页通用） ---------- */
.page-hero {
  position: relative;
  height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  background: var(--color-primary);
}

.page-hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #0a2e5c 0%, #0d4a8a 50%, #0a2e5c 100%);
  background-size: cover;
  background-position: center;
}

.page-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 46, 92, 0.35) 0%, rgba(10, 46, 92, 0.15) 100%);
}

.page-hero-content {
  position: relative;
  z-index: 2;
  color: var(--color-white);
  padding-top: var(--header-h);
}

.page-hero-content .eyebrow {
  display: inline-block;
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--color-accent-2);
  font-weight: 600;
  margin-bottom: 16px;
}

.page-hero-content h1 {
  font-size: 42px;
  color: var(--color-white);
  margin-bottom: 14px;
  letter-spacing: 0.02em;
}

.page-hero-content p {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.85);
}

@media (max-width: 768px) {
  .page-hero { height: 260px; }
  .page-hero-content h1 { font-size: 28px; }
  .page-hero-content p { font-size: 14px; }
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: background var(--transition), box-shadow var(--transition);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);

}

/* 透明导航（首页轮播上方） */
.site-header.is-transparent {
  background: transparent;
}

.site-header.is-transparent .nav-link,
.site-header.is-transparent .brand-name {
  color: var(--color-white);
}

.site-header.is-transparent .brand-logo-default {
  display: none;
}

.site-header.is-transparent .brand-logo-light {
  display: block;
}

/* 滚动后白色导航 */
.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  box-shadow: 0 1px 0 var(--color-border), var(--shadow-sm);
}

.site-header.is-scrolled .nav-link {
  color: var(--color-text);
}

.site-header.is-scrolled .brand-name {
  color: var(--color-primary);
}

.site-header.is-scrolled .brand-logo-default {
  display: block;
}

.site-header.is-scrolled .brand-logo-light {
  display: none;
}

.header-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

/* 内置 SVG 图标用：正方形容器 */
.brand-logo {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-logo svg {
  width: 100%;
  height: 100%;
}

/* 后端上传的横版 logo 图片：容器自适应宽度，高度放大到 52px */
.brand-logo.has-img {
  width: auto;
  height: 52px;
  min-width: 52px;
  padding: 0;
  border-radius: 0;
  background: none;
  box-shadow: none;
}

/* 页脚 logo */
.footer-brand .brand-logo.has-img {
  height: 60px;
  min-width: 60px;
  padding: 0;
  background: none;
}

/* 后端上传的 logo 图片：保持宽高比，适配容器 */
.brand-logo-img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: 100%;
  object-fit: contain;
  display: block;
}

/* 彩色 logo 保持原色，不做反相处理 */
.site-header.is-transparent .brand-logo-img-light,
.site-footer .brand-logo-img {
  /* 保持原色 */
}

.brand-logo-light {
  display: none;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.04em;
  transition: color var(--transition);
}

/* 主导航 */
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 10px 20px;
  font-size: 17px;
  font-weight: 500;
  color: var(--color-primary);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background-color var(--transition);
}

/* hover 底色（鼠标经过导航项时） */
.nav-link:hover {
  background-color: rgba(0, 102, 255, 0.08);
}

.site-header.is-transparent .nav-link:hover {
  background-color: rgba(255, 255, 255, 0.12);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 3px;
  background: var(--gradient-primary);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition);
}

.nav-link:hover::after,
.nav-link.is-active::after {
  width: 70%;
}

.nav-link.is-active {
  color: var(--color-white);
  font-weight: 600;
  background: var(--gradient-primary);
  box-shadow: var(--shadow-accent);
}

/* 选中后不再显示下划线（按钮样式自带背景） */
.nav-link.is-active::after {
  display: none;
}

.site-header.is-transparent .nav-link.is-active {
  color: var(--color-white);
  background: var(--gradient-primary);
  box-shadow: var(--shadow-accent);
}

.site-header.is-transparent .nav-link.is-active::after {
  display: none;
}

/* 透明导航滚动变白底后，active 链接保持蓝底白字按钮样式 */
.site-header.is-transparent.is-scrolled .nav-link.is-active {
  color: var(--color-white);
  background: var(--gradient-primary);
  box-shadow: var(--shadow-accent);
}

.site-header.is-transparent.is-scrolled .nav-link.is-active::after {
  display: none;
}

/* ========== 下拉子菜单（鼠标悬浮触发） ========== */
.nav-item {
  position: relative;
  display: inline-block;
}

/* ========== 语言切换按钮 ========== */
.lang-switch {
  font-size: 13px !important;
  font-weight: 600 !important;
  padding: 6px 14px !important;
  border: 1.5px solid currentColor;
  border-radius: 20px !important;
  margin-left: 8px;
  letter-spacing: 0.5px;
  transition: all var(--transition) !important;
}
.lang-switch:hover {
  background-color: var(--color-accent) !important;
  color: var(--color-white) !important;
  border-color: var(--color-accent) !important;
}
.lang-switch::after {
  display: none !important;
}
.site-header.is-scrolled .lang-switch {
  color: var(--color-primary) !important;
  border-color: var(--color-primary) !important;
}
.site-header.is-scrolled .lang-switch:hover {
  color: var(--color-white) !important;
  border-color: var(--color-accent) !important;
}

.nav-item > .nav-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.nav-caret {
  width: 12px;
  height: 12px;
  transition: transform var(--transition);
}

.nav-item:hover .nav-caret {
  transform: rotate(180deg);
}

.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 180px;
  padding: 8px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12), 0 0 0 1px rgba(0, 0, 0, 0.04);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  z-index: 1000;
  /* 顶部小三角箭头 */
  pointer-events: none;
}

.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

/* 顶部小三角 */
.nav-dropdown::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
  width: 12px;
  height: 12px;
  background: #fff;
  border-radius: 2px;
  box-shadow: -1px -1px 2px rgba(0, 0, 0, 0.04);
}

.nav-sub-link {
  display: block;
  padding: 10px 16px;
  font-size: 14px;
  color: #4a5568;
  border-radius: 6px;
  transition: background-color var(--transition), color var(--transition);
  white-space: nowrap;
}

.nav-sub-link:hover {
  background-color: rgba(0, 102, 255, 0.08);
  color: var(--color-primary);
}

.nav-sub-link.is-active {
  color: var(--color-primary);
  background-color: rgba(0, 102, 255, 0.1);
  font-weight: 600;
}

.nav-cta {
  margin-left: 16px;
  padding: 10px 24px !important;
  font-size: 14px;
}

/* 汉堡菜单按钮 */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  position: relative;
  z-index: 1100;
}

.nav-toggle span {
  position: absolute;
  left: 12px;
  right: 12px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition), top var(--transition);
}

.site-header.is-transparent .nav-toggle span {
  background: var(--color-white);
}

.nav-toggle span:nth-child(1) { top: 15px; }
.nav-toggle span:nth-child(2) { top: 21px; }
.nav-toggle span:nth-child(3) { top: 27px; }

.nav-toggle.is-open span:nth-child(1) {
  top: 21px;
  transform: rotate(45deg);
  background: var(--color-primary);
}
.nav-toggle.is-open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.is-open span:nth-child(3) {
  top: 21px;
  transform: rotate(-45deg);
  background: var(--color-primary);
}

/* 移动端遮罩 */
.nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(10, 46, 92, 0.4);
  backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
  z-index: 999;
}

.nav-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.75);
  padding: 72px 0 0;
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 198, 255, 0.5), transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 56px;
}

.footer-brand .brand {
  margin-bottom: 20px;
}

.footer-brand .brand-vertical {
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}

.footer-brand .brand-name {
  color: var(--color-white);
}

.footer-desc {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: 24px;
  max-width: 320px;
}

/* footer 公司简介富文本内的段落样式 */
.footer-desc p {
  margin: 0 0 8px 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.65);
}

.footer-desc p:last-child {
  margin-bottom: 0;
}

.footer-desc strong,
.footer-desc b {
  color: rgba(255, 255, 255, 0.85);
  font-weight: 600;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.8);
  transition: all var(--transition);
}

.footer-social a:hover {
  background: var(--gradient-primary);
  color: var(--color-white);
  transform: translateY(-3px);
}

.footer-col h4 {
  color: var(--color-white);
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 24px;
  position: relative;
  padding-bottom: 12px;
}

.footer-col h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 1px;
}

.footer-links li {
  margin-bottom: 14px;
}

.footer-links a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.65);
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-links a:hover {
  color: var(--color-accent-2);
  transform: translateX(4px);
}

.footer-contact li {
  display: flex;
  gap: 12px;
  margin-bottom: 18px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
}

.footer-contact .icon {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  color: var(--color-accent-2);
  margin-top: 3px;
}

.footer-contact .label {
  display: block;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.45);
  margin-bottom: 2px;
}

.footer-contact .value {
  color: rgba(255, 255, 255, 0.85);
  font-size: 15px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom a:hover {
  color: var(--color-accent-2);
}

/* ---------- Toast 提示 ---------- */
.toast-wrap {
  position: fixed;
  top: 96px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 12px;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--color-white);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(-20px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
  pointer-events: auto;
  min-width: 260px;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.toast-success {
  background: linear-gradient(135deg, #10B981, #059669);
}

.toast-error {
  background: linear-gradient(135deg, #EF4444, #DC2626);
}

.toast-info {
  background: linear-gradient(135deg, #0066FF, #00C6FF);
}

.toast .icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* ---------- 加载骨架 ---------- */
.skeleton {
  background: linear-gradient(90deg, #EEF2F7 25%, #F8FAFC 50%, #EEF2F7 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.4s infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ---------- 空状态 ---------- */
.empty-state {
  text-align: center;
  padding: 80px 24px;
  color: var(--color-text-muted);
}

.empty-state .icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  color: var(--color-border);
}

.empty-state p {
  font-size: 15px;
}

/* ---------- 滚动淡入动效 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
  will-change: opacity, transform;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal[data-delay="1"] { transition-delay: 0.1s; }
.reveal[data-delay="2"] { transition-delay: 0.2s; }
.reveal[data-delay="3"] { transition-delay: 0.3s; }
.reveal[data-delay="4"] { transition-delay: 0.4s; }

/* ---------- 分页器 ---------- */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 56px;
}

.pagination button {
  min-width: 40px;
  height: 40px;
  padding: 0 12px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--color-text-light);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.pagination button:hover:not(:disabled) {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.pagination button.is-active {
  background: var(--gradient-primary);
  color: var(--color-white);
  border-color: transparent;
}

.pagination button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ---------- 富文本内容区 ---------- */
.rich-content {
  font-size: 16px;
  line-height: 1.9;
  color: #2D3748;
}

.rich-content h2 {
  font-size: 26px;
  margin: 36px 0 16px;
  color: var(--color-primary);
}

.rich-content h3 {
  font-size: 20px;
  margin: 28px 0 12px;
  color: var(--color-primary);
}

.rich-content p {
  margin-bottom: 18px;
}

.rich-content img {
  border-radius: var(--radius-md);
  margin: 24px auto;
  box-shadow: var(--shadow-sm);
}

.rich-content ul,
.rich-content ol {
  margin: 16px 0 20px 24px;
}

.rich-content ul li { list-style: disc; margin-bottom: 8px; }
.rich-content ol li { list-style: decimal; margin-bottom: 8px; }

.rich-content blockquote {
  border-left: 4px solid var(--color-accent);
  padding: 12px 20px;
  margin: 20px 0;
  background: var(--color-bg);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-text-light);
}

/* ---------- 通用工具类 ---------- */
.text-center { text-align: center; }
.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.mt-0 { margin-top: 0; }
.hidden { display: none !important; }

/* ---------- 返回顶部 ---------- */
.back-to-top {
  position: fixed;
  right: 32px;
  bottom: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-white);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
  z-index: 900;
  border: 1px solid var(--color-border);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--gradient-primary);
  color: var(--color-white);
  border-color: transparent;
  transform: translateY(-4px);
}

/* ========================================
   响应式：平板 (768px - 992px)
======================================== */
@media (max-width: 992px) {
  :root {
    --header-h: 64px;
  }

  .section { padding: 72px 0; }
  .section-head h2 { font-size: 32px; }
  .section-head { margin-bottom: 40px; }

  /* 导航变汉堡 */
  .nav-toggle {
    display: block;
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 300px;
    max-width: 80vw;
    height: 100vh;
    background: var(--color-white);
    flex-direction: column;
    align-items: stretch;
    padding: 96px 24px 32px;
    gap: 4px;
    transform: translateX(100%);
    transition: transform 0.35s var(--ease);
    z-index: 1000;
    box-shadow: -8px 0 32px rgba(10, 46, 92, 0.12);
    overflow-y: auto;
  }

  .main-nav.is-open {
    transform: translateX(0);
  }

  .nav-link {
    color: var(--color-text) !important;
    padding: 14px 16px;
    border-radius: var(--radius-sm);
    font-size: 16px;
    border-bottom: 1px solid var(--color-border);
  }

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

  .nav-link.is-active {
    color: var(--color-accent) !important;
    background: rgba(0, 102, 255, 0.06);
  }

  /* 移动端：下拉菜单改为内嵌展开（不再悬浮） */
  .nav-item {
    display: block;
  }

  .nav-item > .nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
  }

  .nav-caret {
    transition: transform 0.2s;
  }

  /* 移动端下拉默认展开（因为不是悬浮触发） */
  .nav-dropdown {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    box-shadow: none;
    background: rgba(0, 102, 255, 0.03);
    border-radius: 0;
    padding: 0 0 4px 16px;
    margin-top: 0;
    min-width: 0;
  }

  .nav-dropdown::before {
    display: none;
  }

  .nav-sub-link {
    padding: 12px 16px;
    font-size: 14px;
    color: #6a7384;
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
    border-radius: 0;
  }

  .nav-sub-link:last-child {
    border-bottom: none;
  }

  .nav-cta {
    margin: 16px 0 0;
    width: 100%;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

/* ========================================
   响应式：移动端 (< 768px)
======================================== */
@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .section { padding: 56px 0; }
  .section-sm { padding: 48px 0; }
  .section-head h2 { font-size: 26px; }
  .section-head p { font-size: 14px; }
  .section-head { margin-bottom: 32px; }

  .btn {
    padding: 12px 24px;
    font-size: 14px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-bottom: 40px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
    padding: 20px 0;
  }

  .toast-wrap {
    top: 80px;
    left: 16px;
    right: 16px;
    transform: none;
  }

  .toast {
    min-width: 0;
    width: 100%;
  }

  .back-to-top {
    right: 20px;
    bottom: 20px;
    width: 42px;
    height: 42px;
  }

  .breadcrumb ul {
    font-size: 13px;
  }

  .rich-content { font-size: 15px; }
  .rich-content h2 { font-size: 22px; }
  .rich-content h3 { font-size: 18px; }
}

/* ========================================
   响应式：小屏移动 (< 480px)
======================================== */
@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .section-head h2 { font-size: 22px; }
  .btn { padding: 11px 20px; font-size: 13px; }
}