/* ==========================================================================
   乐儿互动 - 技术赋能数字营销服务商
   全局样式表（亮蓝清爽风格，参考同类数字营销公司官网）
   ========================================================================== */

/* ---------- CSS 变量 ---------- */
:root {
  --color-primary: #0096fa;
  --color-primary-dark: #0077cc;
  --color-primary-deep: #014c9f;
  --color-primary-light: #33abfb;
  --color-accent: #ff403d;
  --color-dark: #0e2a47;
  --color-dark-2: #1e293b;
  --color-gray: #666;
  --color-gray-light: #999;
  --color-bg: #ffffff;
  --color-bg-soft: #f4f8fc;
  --color-border: #e6eef7;
  --color-text: #434343;
  --color-text-heading: #252525;

  --gradient-primary: linear-gradient(135deg, #0096fa 0%, #33abfb 100%);
  --gradient-deep: linear-gradient(135deg, #014c9f 0%, #0096fa 100%);
  --gradient-hero: linear-gradient(180deg, #eaf4fd 0%, #d7ecfc 100%);

  --shadow-sm: 0 2px 6px rgba(1, 76, 159, 0.06);
  --shadow-md: 0 8px 24px rgba(1, 76, 159, 0.10);
  --shadow-lg: 0 16px 40px rgba(1, 76, 159, 0.14);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  --container: 1200px;
  --header-height: 72px;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.25s ease;
}

a:hover {
  color: var(--color-primary-deep);
}

ul,
ol {
  list-style: none;
}

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

.section {
  padding: 80px 0;
}

.section--soft {
  background: var(--color-bg-soft);
}

.section--dark {
  background: var(--gradient-deep);
  color: #cde7fa;
}

/* ---------- 顶部信息条 ---------- */
.topbar {
  background: var(--color-dark);
  color: #9fb8cf;
  font-size: 13px;
}

.topbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 40px;
}

.topbar .topbar-left {
  display: flex;
  gap: 24px;
}

.topbar a {
  color: #9fb8cf;
}

.topbar a:hover {
  color: #fff;
}

/* ---------- 通用标题 ---------- */
.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 52px;
}

.section-head .eyebrow {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--color-primary);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-head h2 {
  font-size: 34px;
  line-height: 1.35;
  color: var(--color-text-heading);
  font-weight: 700;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 18px;
}

.section-head h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 52px;
  height: 4px;
  border-radius: 2px;
  background: var(--gradient-primary);
}

.section-head p {
  font-size: 16px;
  color: var(--color-gray);
  margin-top: 16px;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand img {
  width: 42px;
  height: 42px;
  object-fit: contain;
}

.brand .brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text-heading);
  letter-spacing: 1px;
}

.brand .brand-sub {
  font-size: 11px;
  color: var(--color-gray-light);
  letter-spacing: 1px;
  line-height: 1;
}

.main-nav ul {
  display: flex;
  align-items: center;
  gap: 2px;
}

.main-nav a {
  display: inline-block;
  padding: 10px 18px;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-dark-2);
  border-radius: 6px;
  position: relative;
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 6px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.25s ease;
}

.main-nav a:hover {
  color: var(--color-primary);
}

.main-nav a:hover::after {
  transform: scaleX(1);
}

.main-nav a.is-active {
  color: var(--color-primary);
  font-weight: 600;
}

.main-nav a.is-active::after {
  transform: scaleX(1);
}

.header-cta {
  display: inline-block;
  padding: 10px 26px;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  border-radius: 50px;
  white-space: nowrap;
  box-shadow: 0 6px 16px rgba(0, 150, 250, 0.3);
}

.header-cta:hover {
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 10px 22px rgba(0, 150, 250, 0.4);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-dark-2);
  border-radius: 2px;
}

/* ---------- Hero 轮播 ---------- */
.hero {
  position: relative;
  overflow: hidden;
  background: var(--gradient-hero);
}

.hero-slider {
  position: relative;
  height: 520px;
}

.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.8s ease;
}

.hero-slide.is-active {
  opacity: 1;
}

.hero-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-slide::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    rgba(1, 76, 159, 0.86) 0%,
    rgba(0, 118, 208, 0.55) 50%,
    rgba(0, 150, 250, 0.15) 100%
  );
}

.hero-content {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  align-items: center;
}

.hero-content .container {
  max-width: var(--container);
}

.hero-title {
  color: #fff;
  font-size: 50px;
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: 1px;
  margin-bottom: 18px;
  text-shadow: 0 2px 12px rgba(1, 76, 159, 0.35);
}

.hero-title .accent {
  color: #7ed4ff;
}

.hero-subtitle {
  color: #eaf4fd;
  font-size: 18px;
  max-width: 560px;
  margin-bottom: 30px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 50px;
  transition: all 0.25s ease;
  cursor: pointer;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 8px 20px rgba(0, 150, 250, 0.35);
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(0, 150, 250, 0.45);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.btn-ghost:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.28);
}

.hero-dots {
  position: absolute;
  bottom: 26px;
  left: 0;
  right: 0;
  z-index: 3;
  display: flex;
  justify-content: center;
  gap: 10px;
}

.hero-dots button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.45);
  cursor: pointer;
  transition: all 0.3s ease;
}

.hero-dots button.is-active {
  width: 30px;
  border-radius: 10px;
  background: #fff;
}

/* ---------- 痛点 → 方案 ---------- */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.pain-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px 26px;
  text-align: center;
  position: relative;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
}

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

.pain-question {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text-heading);
  margin-bottom: 8px;
  line-height: 1.5;
}

.pain-arrow {
  display: block;
  width: 32px;
  height: 32px;
  margin: 14px auto;
  color: var(--color-accent);
}

.pain-arrow svg {
  width: 32px;
  height: 32px;
}

.pain-answer {
  display: inline-block;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.pain-card p {
  font-size: 14px;
  color: var(--color-gray);
  margin-bottom: 16px;
}

.pain-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.pain-link svg {
  width: 15px;
  height: 15px;
  transition: transform 0.25s ease;
}

.pain-card:hover .pain-link svg {
  transform: translateX(4px);
}

/* ---------- 业务卡片 ---------- */
.biz-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.biz-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.biz-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

.biz-card:hover::before {
  opacity: 1;
}

.biz-icon {
  width: 58px;
  height: 58px;
  border-radius: 14px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  box-shadow: 0 6px 16px rgba(0, 150, 250, 0.25);
}

.biz-icon svg {
  width: 28px;
  height: 28px;
  stroke: #fff;
}

.biz-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text-heading);
  margin-bottom: 8px;
}

.biz-card .biz-tag {
  font-size: 13px;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 12px;
}

.biz-card p {
  font-size: 14.5px;
  color: var(--color-gray);
  margin-bottom: 20px;
  flex: 1;
}

.biz-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.biz-link svg {
  width: 16px;
  height: 16px;
  transition: transform 0.25s ease;
}

.biz-card:hover .biz-link svg {
  transform: translateX(4px);
}

/* ---------- 关于 / 简介区块 ---------- */
.about-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.about-visual {
  position: relative;
}

.about-visual .about-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about-visual .about-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-stat-float {
  position: absolute;
  bottom: -22px;
  right: 24px;
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 18px 24px;
  display: flex;
  gap: 16px;
}

.about-stat-float .num {
  font-size: 34px;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}

.about-stat-float .label {
  font-size: 13px;
  color: var(--color-gray);
}

.about-body .eyebrow {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.about-body h2 {
  font-size: 32px;
  color: var(--color-text-heading);
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 18px;
}

.about-body p {
  color: var(--color-gray);
  margin-bottom: 16px;
}

.about-points {
  margin-top: 12px;
}

.about-points li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 12px;
  color: var(--color-dark-2);
}

.about-points li svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  stroke: var(--color-primary);
  margin-top: 3px;
}

/* ---------- 数据指标 ---------- */
.stats-band {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item .stat-num {
  font-size: 46px;
  font-weight: 800;
  color: #fff;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-item .stat-num .unit {
  font-size: 22px;
  margin-left: 2px;
}

.stat-item .stat-label {
  color: #a8d6f8;
  font-size: 15px;
}

/* ---------- 服务流程 ---------- */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.process-step {
  position: relative;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.process-step .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  font-weight: 700;
  font-size: 18px;
  margin-bottom: 18px;
  box-shadow: 0 6px 16px rgba(0, 150, 250, 0.3);
}

.process-step h3 {
  font-size: 18px;
  color: var(--color-text-heading);
  margin-bottom: 8px;
}

.process-step p {
  font-size: 14px;
  color: var(--color-gray);
}

/* ---------- 行业标签 ---------- */
.industry-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.industry-tags span {
  padding: 10px 26px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 50px;
  font-size: 15px;
  color: var(--color-dark-2);
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
}

.industry-tags span:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

/* ---------- CTA ---------- */
.cta-box {
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  padding: 52px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  box-shadow: var(--shadow-lg);
}

.cta-box h2 {
  color: #fff;
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
}

.cta-box p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 16px;
}

.cta-box .btn {
  background: #fff;
  color: var(--color-primary);
}

.cta-box .btn:hover {
  color: var(--color-primary-deep);
  transform: translateY(-2px);
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--color-dark);
  color: #9fb8cf;
  padding: 60px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .brand {
  margin-bottom: 16px;
}

.footer-brand .brand-name {
  color: #fff;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
}

.footer-col h4 {
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 18px;
  position: relative;
  padding-left: 14px;
}

.footer-col h4::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 3px;
  height: 16px;
  border-radius: 2px;
  background: var(--color-primary);
}

.footer-col ul li {
  margin-bottom: 12px;
}

.footer-col ul a {
  color: #9fb8cf;
  font-size: 14px;
}

.footer-col ul a:hover {
  color: #fff;
}

.footer-contact li {
  display: flex;
  gap: 8px;
  font-size: 14px;
  margin-bottom: 14px;
  line-height: 1.6;
}

.footer-contact .label {
  color: #7d97b0;
  flex-shrink: 0;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
}

.footer-bottom a {
  color: #7d97b0;
}

.footer-bottom a:hover {
  color: #fff;
}

/* ---------- 内页 Hero ---------- */
.page-hero {
  position: relative;
  background: var(--gradient-deep);
  color: #fff;
  padding: 72px 0;
  overflow: hidden;
}

.page-hero::after {
  content: "";
  position: absolute;
  top: -60%;
  right: -10%;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(51, 171, 251, 0.5), transparent 70%);
}

.page-hero .container {
  position: relative;
  z-index: 2;
}

.page-hero h1 {
  font-size: 38px;
  font-weight: 800;
  margin-bottom: 14px;
}

.page-hero p {
  color: #d9ecfb;
  font-size: 17px;
  max-width: 640px;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding: 16px 0;
  background: var(--color-bg-soft);
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb li {
  color: var(--color-gray);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--color-gray-light);
}

.breadcrumb a {
  color: var(--color-gray);
}

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

.breadcrumb [aria-current="page"] {
  color: var(--color-text-heading);
  font-weight: 500;
}

/* ---------- 业务详情页 ---------- */
.biz-detail-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  align-items: start;
}

.biz-sidebar {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  position: sticky;
  top: calc(var(--header-height) + 24px);
  box-shadow: var(--shadow-sm);
}

.biz-sidebar h3 {
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text-heading);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-soft);
}

.biz-sidebar a {
  display: block;
  padding: 15px 24px;
  color: var(--color-dark-2);
  font-size: 15px;
  border-left: 3px solid transparent;
  transition: all 0.2s ease;
}

.biz-sidebar a:hover {
  background: rgba(0, 150, 250, 0.05);
  color: var(--color-primary);
}

.biz-sidebar a.is-active {
  color: var(--color-primary);
  font-weight: 600;
  border-left-color: var(--color-primary);
  background: rgba(0, 150, 250, 0.07);
}

.biz-detail-content {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-sm);
}

.biz-detail-content h2 {
  font-size: 26px;
  color: var(--color-text-heading);
  margin-bottom: 18px;
  padding-left: 14px;
  border-left: 4px solid var(--color-primary);
}

.biz-detail-content h3 {
  font-size: 19px;
  color: var(--color-text-heading);
  margin: 30px 0 12px;
}

.biz-detail-content p {
  color: var(--color-text);
  margin-bottom: 16px;
  line-height: 1.9;
}

.biz-detail-content ul {
  margin: 16px 0;
  padding-left: 4px;
}

.biz-detail-content ul li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 12px;
  color: var(--color-text);
  line-height: 1.8;
}

.biz-detail-content ul li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 11px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
}

.biz-detail-content .lead {
  font-size: 17px;
  color: var(--color-dark-2);
  background: var(--color-bg-soft);
  padding: 22px;
  border-radius: var(--radius-sm);
  margin-bottom: 28px;
  border: 1px solid var(--color-border);
}

/* ---------- 联系页 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 40px;
}

.contact-info-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-sm);
}

.contact-info-card h2 {
  font-size: 22px;
  color: var(--color-text-heading);
  margin-bottom: 24px;
}

.contact-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}

.contact-item .icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 14px rgba(0, 150, 250, 0.25);
}

.contact-item .icon svg {
  width: 22px;
  height: 22px;
  stroke: #fff;
}

.contact-item .label {
  font-size: 13px;
  color: var(--color-gray-light);
  margin-bottom: 2px;
}

.contact-item .value {
  font-size: 16px;
  color: var(--color-dark-2);
  font-weight: 500;
}

.contact-qr {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
}

.contact-qr img {
  width: 180px;
  height: 180px;
  margin: 0 auto 16px;
  border-radius: var(--radius-sm);
}

.contact-qr h2 {
  font-size: 20px;
  color: var(--color-text-heading);
  margin-bottom: 8px;
}

.contact-qr p {
  color: var(--color-gray);
  font-size: 14px;
}

/* ---------- 关于页 ---------- */
.about-page-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.value-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.value-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.value-card h3 {
  font-size: 18px;
  color: var(--color-text-heading);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.value-card h3 svg {
  width: 22px;
  height: 22px;
  stroke: var(--color-primary);
}

.value-card p {
  font-size: 14.5px;
  color: var(--color-gray);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .biz-grid,
  .pain-grid,
  .stats-band,
  .process-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .biz-detail-layout {
    grid-template-columns: 1fr;
  }

  .biz-sidebar {
    position: static;
  }

  .biz-sidebar ul {
    display: flex;
    flex-wrap: wrap;
  }

  .biz-sidebar a {
    border-left: none;
    border-bottom: 2px solid transparent;
  }

  .biz-sidebar a.is-active {
    border-bottom-color: var(--color-primary);
  }
}

@media (max-width: 768px) {
  .section {
    padding: 56px 0;
  }

  .section-head h2,
  .about-body h2 {
    font-size: 26px;
  }

  .topbar .topbar-left {
    display: none;
  }

  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    padding: 16px 24px;
    transform: translateY(-120%);
    transition: transform 0.3s ease;
  }

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

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

  .main-nav a {
    display: block;
    padding: 14px 16px;
  }

  .header-cta {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-slider {
    height: 400px;
  }

  .hero-title {
    font-size: 32px;
  }

  .about-split,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .biz-grid,
  .pain-grid,
  .stats-band,
  .process-grid,
  .about-page-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .biz-detail-content {
    padding: 28px 20px;
  }

  .cta-box {
    padding: 40px 28px;
    text-align: center;
    justify-content: center;
  }

  .hero-content {
    text-align: center;
  }

  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .page-hero h1 {
    font-size: 28px;
  }
}

/* ---------- 无障碍：焦点态 ---------- */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- 屏幕阅读器辅助 ---------- */
.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;
}