/* ================================================================
   随济科技官网 - 主样式表
   设计定位：专业、可信赖的IT管理咨询公司形象
   主色调：深蓝 #1a3a5c   强调色：金色 #c9953c
   ================================================================ */

/* ========== CSS 变量 ========== */
:root {
  --primary: #1a3a5c;
  --primary-light: #2c5f8a;
  --primary-dark: #0f2640;
  --accent: #c9953c;
  --accent-light: #e0b860;
  --bg-light: #f8f9fa;
  --bg-white: #ffffff;
  --text-primary: #2c3e50;
  --text-secondary: #5a6c7d;
  --text-muted: #95a5a6;
  --border: #e0e6ed;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 4px 24px rgba(0, 0, 0, 0.12);
  --radius: 8px;
  --max-width: 1200px;
  --nav-height: 68px;
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  color: var(--text-primary);
  line-height: 1.7;
  background: var(--bg-white);
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul {
  list-style: none;
}

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

/* ========== 导航栏 ========== */
.nav-bar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-white);
  height: var(--nav-height);
  border-bottom: 1px solid transparent;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.nav-bar.scrolled {
  box-shadow: var(--shadow-lg);
  border-bottom-color: var(--border);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--primary);
  font-weight: 700;
  font-size: 20px;
}

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

.logo-img {
  height: 40px;
  width: auto;
}

.logo-text {
  letter-spacing: 2px;
}

.nav-menu {
  display: flex;
  gap: 4px;
}

.nav-link {
  padding: 8px 16px;
  color: var(--text-secondary);
  font-size: 15px;
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background: rgba(26, 58, 92, 0.06);
}

/* 汉堡菜单 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger.active .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ========== 首屏横幅 ========== */
.hero-banner {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 40%, var(--primary-light) 100%);
  overflow: hidden;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(201, 149, 60, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.05) 0%, transparent 40%);
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 80px 20px;
}

.hero-title {
  font-size: 42px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 20px;
  letter-spacing: 2px;
  line-height: 1.3;
}

.hero-subtitle {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 36px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ========== 通用按钮 ========== */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border: none;
  border-radius: 6px;
  font-size: 16px;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  letter-spacing: 1px;
}

.btn-primary:hover {
  background: var(--accent-light);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(201, 149, 60, 0.4);
}

/* ========== 通用区域 ========== */
.section {
  padding: 80px 0;
}

.section:nth-child(even) {
  background: var(--bg-light);
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
  text-align: center;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 16px;
}

.section-title::after {
  content: "";
  display: block;
  width: 60px;
  height: 3px;
  background: var(--accent);
  margin: 0 auto;
  margin-top: 16px;
  border-radius: 2px;
}

.section-desc {
  text-align: center;
  color: var(--text-secondary);
  font-size: 16px;
  max-width: 760px;
  margin: 0 auto 48px;
}

/* "了解更多"链接区域 */
.section-more {
  text-align: center;
  margin-top: 40px;
}

.btn-outline {
  display: inline-block;
  padding: 10px 28px;
  border: 2px solid var(--primary);
  border-radius: 6px;
  font-size: 15px;
  color: var(--primary);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}

.btn-outline:hover {
  background: var(--primary);
  color: #fff;
}

/* 内容块（子页面正文区） */
.content-block p {
  color: var(--text-secondary);
  font-size: 16px;
  margin-bottom: 20px;
  line-height: 1.9;
  text-indent: 2em;
}

.content-block p:first-child {
  margin-top: 0;
}

/* ========== 页面横幅（子页面顶部标题区） ========== */
.page-banner {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
  padding: 60px 0;
  text-align: center;
}

.page-banner-title {
  font-size: 36px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.page-banner-subtitle {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.8);
  max-width: 600px;
  margin: 0 auto;
}

/* ========== 引导卡片（首页服务入口） ========== */
.guide-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.guide-card {
  display: block;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  color: var(--text-primary);
}

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

.guide-icon {
  font-size: 48px;
  display: block;
  margin-bottom: 16px;
}

/* 服务卡片图片 */
.guide-img {
  width:100%;
  max-width:300px;
  height:auto;
  border-radius: var(--radius);
  display: block;
  margin:0 auto 16px;
}

.guide-card h3 {
  font-size: 22px;
  color: var(--primary);
  margin-bottom: 12px;
}

.guide-card p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 16px;
  text-align: justify;
}

.guide-link {
  display: inline-block;
  color: var(--accent);
  font-weight: 600;
  font-size: 15px;
}

.guide-card:hover .guide-link {
  color: var(--primary);
}

/* 联系我们引导区域 */
.contact-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 20px;
}

.contact-cta p {
  color: var(--text-secondary);
  font-size: 16px;
}


/* ========== 关于我们 ========== */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: start;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-size: 15px;
  text-indent: 2em;
}

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.highlight-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}

.highlight-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.highlight-number {
  display: block;
  font-size: 36px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1.2;
}

.highlight-label {
  display: block;
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 6px;
}

/* ========== 咨询服务 ========== */
.consulting-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.consulting-category {
  background: var(--bg-white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.category-title {
  padding: 20px 24px;
  font-size: 18px;
  color: var(--primary);
  background: linear-gradient(135deg, rgba(26, 58, 92, 0.04), rgba(26, 58, 92, 0.01));
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
}

.category-icon {
  font-size: 22px;
}

/* 折叠面板 */
.accordion-item {
  border-bottom: 1px solid var(--border);
}

.accordion-item:last-child {
  border-bottom: none;
}

.accordion-header {
  width: 100%;
  padding: 16px 24px;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 15px;
  font-family: inherit;
  color: var(--text-primary);
  text-align: left;
  transition: background var(--transition), color var(--transition);
}

.accordion-header:hover {
  background: rgba(26, 58, 92, 0.03);
  color: var(--primary);
}

.accordion-header[aria-expanded="true"] {
  color: var(--primary);
  font-weight: 600;
}

.accordion-arrow {
  font-size: 18px;
  color: var(--accent);
  transition: transform var(--transition);
  flex-shrink: 0;
  margin-left: 12px;
}

.accordion-header[aria-expanded="true"] .accordion-arrow {
  transform: rotate(45deg);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.accordion-content p {
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.8;
}

.accordion-header[aria-expanded="true"] + .accordion-content {
  max-height: 500px;
  padding-bottom: 20px;
}

/* ========== 企业内训 ========== */
.tab-container {
  background: var(--bg-white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.tab-buttons {
  display: flex;
  border-bottom: 2px solid var(--border);
}

.tab-btn {
  flex: 1;
  padding: 16px 24px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 16px;
  font-family: inherit;
  color: var(--text-secondary);
  font-weight: 600;
  transition: color var(--transition), background var(--transition);
  position: relative;
}

.tab-btn:hover {
  color: var(--primary);
  background: rgba(26, 58, 92, 0.03);
}

.tab-btn.active {
  color: var(--primary);
}

.tab-btn.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 20%;
  right: 20%;
  height: 3px;
  background: var(--accent);
  border-radius: 2px 2px 0 0;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.course-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.course-table {
  width: 100%;
  border-collapse: collapse;
}

.course-table thead {
  background: rgba(26, 58, 92, 0.04);
}

.course-table th {
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 700;
  color: var(--primary);
  text-align: center;
  border-bottom: 2px solid var(--border);
}

.course-table th:first-child {
  width: 35%;
}

.course-table td {
  padding: 14px 20px;
  font-size: 14px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  line-height: 1.7;
  text-align: justify;
  text-justify: inter-ideograph;
}

.course-table tbody tr:hover {
  background: rgba(26, 58, 92, 0.02);
}

.course-table tbody tr:last-child td {
  border-bottom: none;
}

/* ========== 客户案例 ========== */
/* 案例卡片容器（首页 & 案例页共用） */
.case-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.case-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

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

.case-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.case-number {
  display: inline-block;
  padding: 3px 10px;
  background: var(--primary);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  border-radius: 4px;
  letter-spacing: 1px;
}

.case-period {
  font-size: 13px;
  color: var(--accent);
  font-weight: 600;
}

.case-card-title {
  font-size: 18px;
  color: var(--primary);
  margin-bottom: 6px;
  font-weight: 700;
}

.case-card-subtitle {
  font-size: 14px;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.case-card-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  text-align: justify;
  text-justify: inter-ideograph;
}

/* 案例详情卡片（案例页专用 - 完整宽度） */
.case-detail-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.case-detail-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.case-detail-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.case-detail-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 8px;
}

.case-detail-number {
  display: inline-block;
  padding: 4px 12px;
  background: var(--primary);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  border-radius: 4px;
  letter-spacing: 1px;
}

.case-detail-period {
  font-size: 13px;
  color: var(--accent);
  font-weight: 600;
}

.case-detail-title {
  font-size: 20px;
  color: var(--primary);
  margin-bottom: 6px;
  font-weight: 700;
}

.case-detail-subtitle {
  font-size: 15px;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--border);
}

.case-detail-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.9;
  text-align: justify;
  text-justify: inter-ideograph;
}

/* ========== 首席顾问 ========== */
.advisor-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  align-items: start;
}

.advisor-photo {
  position: sticky;
  top: calc(var(--nav-height) + 24px);
}

.advisor-img {
  max-width:160px;
  width:100%;
  height: auto;
  border-radius: var(--radius);
  display: block;
  margin:0 auto;
}

.photo-placeholder {
  width: 100%;
  aspect-ratio: 3 / 4;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 4px;
}

.advisor-name {
  font-size: 26px;
  color: var(--primary);
  margin-bottom: 12px;
}

.advisor-intro {
  color: var(--text-secondary);
  font-size: 15px;
  margin-bottom: 24px;
  line-height: 1.8;
  text-align: justify;
  text-justify: inter-ideograph;
}

.advisor-section {
  margin-bottom: 20px;
}

.advisor-section h4 {
  font-size: 16px;
  color: var(--primary);
  margin-bottom: 10px;
  padding-left: 12px;
  border-left: 3px solid var(--accent);
}

.advisor-section ul {
  padding-left: 4px;
}

.advisor-section li {
  position: relative;
  padding: 4px 0 4px 16px;
  color: var(--text-secondary);
  font-size: 14px;
}

.advisor-section li::before {
  content: "·";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

.advisor-section p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.8;
  text-align: justify;
  text-justify: inter-ideograph;
}

.badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.badge {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(26, 58, 92, 0.08);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  border-radius: 4px;
  letter-spacing: 1px;
}

/* ========== 联系我们 ========== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-info h3 {
  font-size: 22px;
  color: var(--primary);
  margin-bottom: 24px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 0;
  color: var(--text-secondary);
  font-size: 15px;
}

/* 首页紧凑联系方式 */
.contact-info-only {
  max-width: 500px;
  margin: 0 auto;
  text-align: left;
}

.contact-info-only h3 {
  font-size: 22px;
  color: var(--primary);
  margin-bottom: 16px;
  text-align: center;
}

.contact-item.compact {
  padding: 4px 0;
}

.contact-icon {
  flex-shrink: 0;
  font-size: 18px;
  margin-top: 2px;
}

/* 表单 */
.contact-form-wrapper {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.required {
  color: #e74c3c;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 15px;
  font-family: inherit;
  color: var(--text-primary);
  transition: border-color var(--transition), box-shadow var(--transition);
  background: var(--bg-white);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26, 58, 92, 0.1);
}

.form-group input.error,
.form-group textarea.error {
  border-color: #e74c3c;
}

.form-group input.error:focus,
.form-group textarea.error:focus {
  box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}

.form-error {
  display: block;
  font-size: 13px;
  color: #e74c3c;
  margin-top: 4px;
  min-height: 18px;
}

.contact-form .btn {
  width: 100%;
}

/* ========== 页脚 ========== */
.footer {
  background: var(--primary-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 32px 0;
  text-align: center;
  font-size: 14px;
}

.footer-company {
  color: #fff;
  font-weight: 600;
  margin-bottom: 8px;
  font-size: 16px;
}

.footer-copyright {
  margin-bottom: 4px;
}

.footer-icp {
  font-size: 12px;
  opacity: 0.6;
}

.footer-icp a {
  color: inherit;
  text-decoration: none;
}

.footer-icp a:hover {
  text-decoration: underline;
}

/* ========== 回到顶部 ========== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 20px;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition), background var(--transition);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.back-to-top:hover {
  background: var(--accent);
  transform: translateY(-3px);
}

/* ========== 响应式 ========== */

/* 平板 (≤1024px) */
@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .consulting-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .guide-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .case-cards {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .case-detail-cards {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .advisor-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .advisor-photo {
    position: static;
    max-width: 240px;
    margin: 0 auto;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .page-banner {
    padding: 40px 0;
  }

  .page-banner-title {
    font-size: 28px;
  }
}

/* 手机 (≤768px) */
@media (max-width: 768px) {
  :root {
    --nav-height: 60px;
  }

  .section {
    padding: 56px 0;
  }

  .section-title {
    font-size: 26px;
  }

  .section-desc {
    max-width: 420px;
    font-size: 14px;
    padding: 0 4px;
  }

  .hero-banner {
    min-height: 400px;
  }

  .hero-title {
    font-size: 24px;
  }

  .hero-subtitle {
    font-size: 15px;
  }

  /* 移动端导航 */
  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 260px;
    height: 100vh;
    flex-direction: column;
    background: var(--bg-white);
    box-shadow: var(--shadow-lg);
    padding: 80px 24px 24px;
    gap: 0;
    transition: right var(--transition);
    z-index: 1000;
  }

  .nav-menu.open {
    right: 0;
  }

  .nav-link {
    padding: 14px 16px;
    font-size: 16px;
    border-bottom: 1px solid var(--border);
    border-radius: 0;
  }

  .about-highlights {
    grid-template-columns: 1fr 1fr;
  }

  .highlight-number {
    font-size: 28px;
  }

  /* 手机端段落两端对齐 */
  .about-text p,
  .content-block p {
    text-align: justify;
    text-justify: inter-ideograph;
  }

  .case-cards {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .case-detail-cards {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .case-card {
    padding: 24px 20px;
  }

  .case-card-title {
    font-size: 17px;
  }

  .case-detail-card {
    padding: 24px 20px;
  }

  .case-detail-title {
    font-size: 18px;
  }

  .tab-buttons {
    flex-direction: column;
  }

  .tab-btn.active::after {
    display: none;
  }

  .tab-btn.active {
    background: rgba(26, 58, 92, 0.06);
  }

  /* 移动端课程表格 → 卡片 */
  .course-table thead {
    display: none;
  }

  .course-table,
  .course-table tbody,
  .course-table tr,
  .course-table td {
    display: block;
  }

  .course-table tr {
    margin-bottom: 12px;
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
  }

  .course-table td {
    padding: 10px 16px;
    border-bottom: none;
  }

  .course-table td:first-child {
    font-weight: 600;
    color: var(--primary);
    background: rgba(26, 58, 92, 0.03);
    font-size: 14px;
    border-bottom: 1px solid var(--border);
  }

  .course-table td:last-child {
    font-size: 13px;
    padding-top: 12px;
    padding-bottom: 16px;
  }

  .contact-form-wrapper {
    padding: 20px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    font-size: 18px;
  }
}

/* 小屏手机 (≤480px) */
@media (max-width: 480px) {
  .hero-title {
    font-size: 20px;
  }

  .hero-subtitle {
    font-size: 14px;
  }

  .section-desc {
    max-width: 380px;
    font-size: 13px;
    padding: 0 2px;
  }

  .case-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .about-highlights {
    grid-template-columns: 1fr 1fr;
  }

  .highlight-number {
    font-size: 24px;
  }
}