/* ============================================
   主样式表
   ============================================ */

/* --- CSS 变量 --- */
:root {
  --color-bg: #f5f5f5;
  --color-bg-warm: #fcfcf1;
  --color-bg-beige: #f2f2e7;
  --color-primary: #8d4bbb;
  --color-primary-dark: #934491;
  --color-primary-light: #F8F2F5;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-text-lighter: #999999;
  --color-white: #ffffff;
  --color-border: #e8e8e8;
  --font-main: 'SimSun', '宋体', serif;
  --font-size-base: 18px;
  --font-size-sm: 15px;
  --font-size-lg: 22px;
  --font-size-xl: 28px;
  --font-size-2xl: 38px;
  --font-size-3xl: 48px;
  --transition: 0.3s ease;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --header-height: 72px;
  --container-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
  font-size: var(--font-size-base);
}

body {
  font-family: var(--font-main);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

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

/* --- Section 通用 --- */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header-left {
  text-align: left;
  margin-bottom: 30px;
}

.section-title {
  font-size: var(--font-size-2xl);
  color: var(--color-text);
  margin-bottom: 16px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  display: block;
  width: 50px;
  height: 3px;
  background: var(--color-primary);
  margin: 12px auto 0;
  border-radius: 2px;
}

.section-header-left .section-title::after {
  margin: 12px 0 0;
}

.section-desc {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

.section-header-left .section-desc {
  margin: 0;
}

/* --- 按钮 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: var(--font-size-base);
  font-family: var(--font-main);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  white-space: nowrap;
}

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

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

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

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

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.6);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--color-white);
}

.btn-block {
  width: 100%;
}

/* ============================================
   顶部导航
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05);
  transition: all var(--transition);
}

.header.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 1001;
}

.logo-img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.logo-text {
  font-size: var(--font-size-xl);
  font-weight: bold;
  color: var(--color-primary-dark);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: block;
  padding: 8px 18px;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  border-radius: 6px;
  transition: all var(--transition);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 20px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
  transition: transform var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
}

.nav-link.active::after,
.nav-link:hover::after {
  transform: translateX(-50%) scaleX(1);
}

/* 菜单切换按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   Hero 首页
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: var(--header-height);
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -20%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.04);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: url('static/images/banner.jpg') center / cover no-repeat;
  opacity: 0.08;
}

.hero-content {
  position: relative;
  z-index: 2;
  color: var(--color-white);
  max-width: 750px;
}

.hero-title {
  font-size: var(--font-size-3xl);
  font-weight: bold;
  margin-bottom: 24px;
  line-height: 1.3;
  animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  opacity: 0.9;
  margin-bottom: 40px;
  line-height: 1.7;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--font-size-sm);
  animation: bounce 2s infinite;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-10px); }
  60% { transform: translateX(-50%) translateY(-5px); }
}

/* ============================================
   产品和服务
   ============================================ */
.products {
  background: var(--color-white);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.product-card {
  background: var(--color-bg-warm);
  border-radius: var(--radius);
  padding: 40px 30px;
  text-align: center;
  transition: all var(--transition);
  border: 1px solid transparent;
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-primary-light);
  background: var(--color-white);
}

.product-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 24px;
  background: var(--color-primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: var(--color-primary);
  transition: all var(--transition);
}

.product-card:hover .product-icon {
  background: var(--color-primary);
  color: var(--color-white);
  transform: scale(1.1);
}

.product-title {
  font-size: var(--font-size-lg);
  margin-bottom: 12px;
  color: var(--color-text);
}

.product-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 20px;
}

.product-link {
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  font-weight: bold;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap var(--transition);
}

.product-link:hover {
  gap: 10px;
}

/* ============================================
   案例展示
   ============================================ */
.cases {
  background: var(--color-bg-beige);
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.case-card {
  background: var(--color-white);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
  box-shadow: var(--shadow);
}

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

.case-img {
  width: 100%;
  height: 220px;
  overflow: hidden;
}

.case-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-bg-beige));
  font-size: 48px;
  color: var(--color-primary);
  transition: all var(--transition);
}

.case-card:hover .case-placeholder {
  transform: scale(1.05);
}

.case-info {
  padding: 24px;
}

.case-tag {
  display: inline-block;
  padding: 4px 14px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 13px;
  border-radius: 20px;
  margin-bottom: 12px;
}

.case-title {
  font-size: var(--font-size-lg);
  margin-bottom: 10px;
}

.case-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.7;
}

.cases-more {
  text-align: center;
  margin-top: 48px;
}

/* ============================================
   关于我们
   ============================================ */
.about {
  background: var(--color-white);
}

.about-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-text {
  font-size: var(--font-size-base);
  color: var(--color-text-light);
  line-height: 1.9;
  margin-bottom: 30px;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 36px;
}

.stat-item {
  text-align: center;
  padding: 20px 12px;
  background: var(--color-bg-warm);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.stat-item:hover {
  background: var(--color-primary-light);
  transform: translateY(-2px);
}

.stat-number {
  display: block;
  font-size: var(--font-size-2xl);
  font-weight: bold;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-lighter);
}

.about-image {
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-img-placeholder {
  width: 100%;
  max-width: 400px;
  aspect-ratio: 1;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-bg-warm));
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  font-size: 72px;
  color: var(--color-primary);
}

.about-img-placeholder span {
  font-size: var(--font-size-xl);
  color: var(--color-primary-dark);
  font-weight: bold;
}

/* ============================================
   联系我们
   ============================================ */
.contact {
  background: var(--color-bg-warm);
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 50px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 20px;
  background: var(--color-white);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.contact-item:hover {
  box-shadow: var(--shadow);
  transform: translateX(4px);
}

.contact-icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  background: var(--color-primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 18px;
}

.contact-text h4 {
  font-size: var(--font-size-base);
  margin-bottom: 4px;
  color: var(--color-text);
}

.contact-text p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

/* 联系表单 */
.contact-form {
  background: var(--color-white);
  padding: 36px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

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

.form-group label {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  margin-bottom: 8px;
  font-weight: bold;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: var(--font-size-base);
  font-family: var(--font-main);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  transition: all var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(141, 75, 187, 0.1);
  background: var(--color-white);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: #2d173b;
  color: rgba(255, 255, 255, 0.8);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
  font-size: var(--font-size-xl);
  color: var(--color-white);
  margin-bottom: 16px;
}

.footer-desc {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  margin-bottom: 20px;
}

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

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  transition: all var(--transition);
}

.footer-social a:hover {
  background: var(--color-primary);
  transform: translateY(-2px);
}

.footer-col h4 {
  font-size: var(--font-size-base);
  color: var(--color-white);
  margin-bottom: 20px;
  position: relative;
}

.footer-col h4::after {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  margin-top: 8px;
  border-radius: 1px;
}

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

.footer-col ul li a {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.7);
  transition: all var(--transition);
}

.footer-col ul li a:hover {
  color: var(--color-white);
  padding-left: 4px;
}

.footer-contact li {
  font-size: var(--font-size-sm);
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: rgba(255, 255, 255, 0.7);
}

.footer-contact li i {
  margin-top: 4px;
  color: var(--color-primary);
}

.footer-bottom {
  text-align: center;
  padding: 24px 0;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom img {
  display: inline-flex;
  align-items: center;
  width: 18x;
  height: 18px;
}

/* ============================================
   返回顶部
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition);
  box-shadow: 0 4px 12px rgba(141, 75, 187, 0.3);
  z-index: 999;
}

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

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

/* ============================================
   页面标题 Banner（子页面）
   ============================================ */
.page-banner {
  min-height: 50vh;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: var(--header-height);
  color: var(--color-white);
}

.page-banner-title {
  font-size: var(--font-size-3xl);
  margin-bottom: 16px;
}

.page-banner-desc {
  font-size: var(--font-size-lg);
  opacity: 0.9;
}

/* ============================================
   详细内容通用样式
   ============================================ */
.page-content {
  padding: 80px 0;
  background: var(--color-white);
}

.page-content.bg-light {
  background: var(--color-bg);
}

/* 产品详情 */
.product-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 60px;
}

.product-detail:last-child {
  margin-bottom: 0;
}

.product-detail:nth-child(even) .product-detail-img {
  order: 1;
}

.product-detail-img {
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-bg-warm));
  border-radius: var(--radius);
  aspect-ratio: 16/10;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 64px;
  color: var(--color-primary);
}

.product-detail-info h3 {
  font-size: var(--font-size-xl);
  margin-bottom: 16px;
  color: var(--color-text);
}

.product-detail-info p {
  font-size: var(--font-size-base);
  color: var(--color-text-light);
  line-height: 1.9;
}

/* 案例详情 */
.cases-page-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

/* 关于详情 */
.about-detail-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-top: 50px;
}

.about-detail-card {
  text-align: center;
  padding: 40px 24px;
  background: var(--color-bg-warm);
  border-radius: var(--radius);
  transition: all var(--transition);
}

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

.about-detail-card .icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: var(--color-primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--color-primary);
}

.about-detail-card h4 {
  font-size: var(--font-size-lg);
  margin-bottom: 10px;
}

.about-detail-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: 1.7;
}

/* 面包屑 */
.breadcrumb {
  padding: 20px 0;
  background: var(--color-bg);
  font-size: var(--font-size-sm);
  color: var(--color-text-lighter);
}

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

.breadcrumb span {
  margin: 0 8px;
}

/* 表单反馈消息 */
.form-message {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  display: none;
}

.form-message.success {
  display: block;
  background: #e8f5e9;
  color: #2e7d32;
}

.form-message.error {
  display: block;
  background: #fce4ec;
  color: #c62828;
}