/* ========================================
   陕西字趣网络科技有限公司 - 官网样式
   ======================================== */

/* ---------- CSS变量 ---------- */
:root {
  --color-primary: #C41E24;
  --color-primary-dark: #A8181E;
  --color-accent: #E84545;
  --color-dark-bg: #1A1A2E;
  --color-light-bg: #F5F5F5;
  --color-text: #333333;
  --color-text-secondary: #666666;
  --color-white: #FFFFFF;
  --color-footer: #111111;
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
  --radius: 8px;
  --radius-lg: 12px;
  --font-stack: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --transition: 0.3s ease;
  --container-max: 1200px;
}

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

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

body {
  font-family: var(--font-stack);
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.7;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

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

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

/* ---------- Section ---------- */
.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text);
  position: relative;
  display: inline-block;
  margin-bottom: 8px;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 3px;
  background: var(--color-primary);
  border-radius: 2px;
}

.section-title.light {
  color: var(--color-white);
}

.section-title.light::after {
  background: var(--color-accent);
}

.section-subtitle {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-top: 16px;
}

.section-subtitle.light {
  color: rgba(255, 255, 255, 0.6);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  margin-top: 12px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  text-align: center;
}

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

.btn-primary:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(196, 30, 36, 0.3);
}

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

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

.btn-cta {
  display: inline-block;
  padding: 10px 24px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
}

.btn-cta:hover {
  background: var(--color-accent);
  transform: translateY(-1px);
}

/* ========================================
   导航栏
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all var(--transition);
  background: transparent;
}

.navbar.scrolled {
  background: var(--color-white);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
  padding: 10px 0;
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.logo-img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
}

.logo-text {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-white);
  transition: color var(--transition);
}

.navbar.scrolled .logo-text {
  color: var(--color-text);
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.85);
  position: relative;
  padding: 4px 0;
  transition: color var(--transition);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition);
}

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

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.navbar.scrolled .nav-link {
  color: var(--color-text);
}

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

.navbar.scrolled .nav-link::after {
  background: var(--color-primary);
}

.navbar-cta {
  color: var(--color-white);
}

.navbar.scrolled .navbar-cta {
  color: var(--color-white);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1001;
  padding: 4px;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--color-white);
  transition: all var(--transition);
  border-radius: 2px;
}

.navbar.scrolled .hamburger span {
  background: var(--color-text);
}

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

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

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

/* 移动端菜单 */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-dark-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}

.mobile-menu.active {
  opacity: 1;
  visibility: visible;
}

.mobile-menu-list {
  text-align: center;
}

.mobile-menu-list li {
  margin: 16px 0;
}

.mobile-nav-link {
  font-size: 1.3rem;
  color: var(--color-white);
  font-weight: 500;
  padding: 8px 20px;
  display: block;
  transition: color var(--transition);
}

.mobile-nav-link:hover {
  color: var(--color-accent);
}

.mobile-cta {
  margin-top: 30px;
}

/* ========================================
   Hero Banner
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: linear-gradient(135deg, #1A1A2E 0%, #16213E 50%, #0F3460 100%);
  overflow: hidden;
}

.hero-particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 120px 20px 40px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 20px;
  line-height: 1.3;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 40px;
  max-width: 600px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}

/* 统计条 */
.hero-stats {
  position: relative;
  z-index: 2;
  width: 100%;
  padding: 30px 0;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(10px);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.stats-grid {
  display: flex;
  justify-content: center;
  gap: 60px;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
  color: var(--color-white);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-accent);
}

.stat-suffix {
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--color-accent);
}

.stat-label {
  display: block;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
  margin-top: 4px;
}

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

.about-content {
  display: flex;
  gap: 50px;
  align-items: center;
}

.about-image {
  flex: 0 0 45%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.about-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.about-image:hover img {
  transform: scale(1.03);
}

.about-text {
  flex: 1;
}

.about-text p {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  line-height: 1.9;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 30px;
}

.about-tag {
  background: var(--color-light-bg);
  border-radius: var(--radius);
  padding: 16px 20px;
  text-align: center;
  flex: 1;
  min-width: 120px;
  transition: all var(--transition);
}

.about-tag:hover {
  background: var(--color-primary);
  transform: translateY(-3px);
}

.about-tag:hover .tag-number,
.about-tag:hover .tag-label {
  color: var(--color-white);
}

.tag-number {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  transition: color var(--transition);
}

.tag-label {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-top: 4px;
  transition: color var(--transition);
}

/* ========================================
   核心业务
   ======================================== */
.services {
  background: var(--color-light-bg);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 36px 24px;
  text-align: center;
  box-shadow: var(--shadow-card);
  transition: all var(--transition);
  cursor: default;
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
}

.service-icon {
  width: 70px;
  height: 70px;
  margin: 0 auto 20px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: var(--color-white);
  transition: all var(--transition);
}

.service-card:hover .service-icon {
  transform: scale(1.1);
}

.service-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

.service-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* 核心方向标识 */
.service-card.service-core {
  position: relative;
  border: 2px solid var(--color-primary);
  background: linear-gradient(135deg, #FFF8F8, var(--color-white));
}

.service-card.service-core:hover {
  border-color: var(--color-accent);
}

.core-badge {
  position: absolute;
  top: -1px;
  right: 20px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: var(--color-white);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 0 0 6px 6px;
  letter-spacing: 1px;
}

.service-card.service-core .service-icon {
  width: 80px;
  height: 80px;
  font-size: 2rem;
}

.service-card.service-core .service-title {
  font-size: 1.2rem;
  color: var(--color-primary);
}

.service-card.service-core .service-desc {
  font-weight: 400;
}

/* 服务领域 - 主方向高亮 */
.industry-card.industry-primary {
  box-shadow: 0 4px 20px rgba(196, 30, 36, 0.15), 0 0 0 2px var(--color-primary);
  background: linear-gradient(to bottom, #FFF8F8, var(--color-white));
}

.industry-card.industry-primary:hover {
  box-shadow: 0 8px 30px rgba(196, 30, 36, 0.2), 0 0 0 2px var(--color-accent);
}

.industry-card.industry-primary .industry-title {
  color: var(--color-primary);
  font-size: 1.35rem;
}

/* ========================================
   服务领域
   ======================================== */
.industries {
  background: var(--color-white);
}

.industries-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-bottom: 40px;
}

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

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

.industry-image {
  position: relative;
  height: 200px;
  overflow: hidden;
}

.industry-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.industry-card:hover .industry-image img {
  transform: scale(1.08);
}

.industry-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60%;
  background: linear-gradient(to top, rgba(26, 26, 46, 0.7), transparent);
}

.industry-body {
  padding: 24px;
}

.industry-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
}

.industry-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.industry-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.industry-tags span {
  padding: 4px 12px;
  background: rgba(196, 30, 36, 0.08);
  color: var(--color-primary);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}

.industry-cases {
  padding-top: 12px;
  border-top: 1px solid #eee;
}

.industry-cases-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.industry-cases p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

/* AI新赛道 */
.ai-highlight {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.ai-highlight-inner {
  background: linear-gradient(135deg, var(--color-primary) 0%, #E84545 50%, #FF6B6B 100%);
  display: flex;
  align-items: center;
  gap: 30px;
  padding: 40px;
  border-radius: var(--radius-lg);
}

.ai-highlight-icon {
  flex-shrink: 0;
  width: 80px;
  height: 80px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  color: var(--color-white);
}

.ai-highlight-content h3 {
  font-size: 1.4rem;
  color: var(--color-white);
  margin-bottom: 10px;
}

.ai-highlight-content p {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.8;
}

/* ========================================
   精选案例
   ======================================== */
.cases {
  background: var(--color-light-bg);
}

.cases-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 10px 24px;
  border: 2px solid #ddd;
  background: var(--color-white);
  border-radius: 30px;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-stack);
}

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

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

.cases-featured {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
  margin-bottom: 50px;
}

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

.case-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.case-card.hidden {
  display: none;
}

.case-image {
  position: relative;
  height: 220px;
  overflow: hidden;
}

.case-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

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

.case-category {
  position: absolute;
  top: 16px;
  left: 16px;
  background: var(--color-primary);
  color: var(--color-white);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}

.case-body {
  padding: 24px;
}

.case-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
}

.case-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.case-features {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.case-features span {
  padding: 4px 12px;
  background: var(--color-light-bg);
  color: var(--color-text-secondary);
  border-radius: 20px;
  font-size: 0.78rem;
}

/* 其他案例 */
.cases-other {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-card);
}

.cases-other-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 24px;
  text-align: center;
}

.cases-other-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.cases-other-group h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.cases-other-group h4 i {
  color: var(--color-primary);
  font-size: 1.1rem;
}

.cases-other-group ul li {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  padding: 5px 0;
  padding-left: 16px;
  position: relative;
}

.cases-other-group ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
  transform: translateY(-50%);
  opacity: 0.5;
}

/* ========================================
   软件产品
   ======================================== */
.products {
  background: var(--color-white);
}

.product-item {
  display: flex;
  gap: 60px;
  align-items: center;
  margin-bottom: 60px;
}

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

.product-reverse {
  flex-direction: row-reverse;
}

.product-image {
  flex: 0 0 45%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.product-image img {
  width: 100%;
  transition: transform 0.5s ease;
}

.product-image:hover img {
  transform: scale(1.03);
}

.product-info {
  flex: 1;
}

.product-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
}

.product-desc {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  line-height: 1.9;
  margin-bottom: 24px;
}

.product-modules {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.module-tag {
  padding: 8px 18px;
  background: var(--color-light-bg);
  border-radius: 20px;
  font-size: 0.88rem;
  color: var(--color-primary);
  font-weight: 500;
  transition: all var(--transition);
}

.module-tag:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

/* ========================================
   合作客户
   ======================================== */
.clients {
  background: var(--color-light-bg);
}

.clients-featured {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.client-card {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  box-shadow: var(--shadow-card);
  transition: all var(--transition);
}

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

.client-featured .client-name {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.client-featured .client-industry {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(196, 30, 36, 0.08);
  color: var(--color-primary);
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 500;
}

/* 客户滚动条 */
.clients-marquee {
  overflow: hidden;
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 20px 0;
  box-shadow: var(--shadow-card);
}

.marquee-track {
  display: flex;
  align-items: center;
  white-space: nowrap;
  animation: marquee 30s linear infinite;
}

.marquee-item {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  padding: 0 8px;
  font-weight: 500;
}

.marquee-divider {
  color: var(--color-primary);
  font-size: 1.2rem;
  padding: 0 4px;
  opacity: 0.5;
}

@keyframes marquee {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

/* ========================================
   联系我们
   ======================================== */
.contact {
  background: var(--color-dark-bg);
  padding-bottom: 60px;
}

.contact-content {
  display: flex;
  gap: 60px;
}

.contact-info {
  flex: 1;
}

.contact-item {
  display: flex;
  gap: 20px;
  margin-bottom: 30px;
}

.contact-item i {
  font-size: 1.5rem;
  color: var(--color-accent);
  margin-top: 4px;
  flex-shrink: 0;
}

.contact-item h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 6px;
}

.contact-item p {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.6;
}

/* 表单 */
.contact-form-wrap {
  flex: 1;
  position: relative;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-white);
  font-size: 0.95rem;
  font-family: var(--font-stack);
  transition: border-color var(--transition);
  outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(255, 255, 255, 0.35);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-accent);
}

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

.btn-submit {
  width: 100%;
  padding: 14px;
  font-size: 1rem;
}

.form-success {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-dark-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}

.form-success.show {
  opacity: 1;
  visibility: visible;
}

.form-success i {
  font-size: 3rem;
  color: #4CAF50;
  margin-bottom: 16px;
}

.form-success h3 {
  font-size: 1.3rem;
  color: var(--color-white);
  margin-bottom: 8px;
}

.form-success p {
  color: rgba(255, 255, 255, 0.6);
}

/* ========================================
   页脚
   ======================================== */
.footer {
  background: var(--color-footer);
  padding: 50px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.footer-logo img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
}

.footer-logo span {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-white);
}

.footer-intro {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.45);
  line-height: 1.8;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 20px;
}

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

.footer-nav a {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.45);
  transition: color var(--transition);
}

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

.footer-contact li {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.45);
  margin-bottom: 12px;
  display: flex;
  gap: 8px;
  line-height: 1.6;
}

.footer-contact i {
  color: var(--color-accent);
  margin-top: 4px;
  flex-shrink: 0;
}

.footer-bottom {
  padding: 20px 0;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.3);
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.4);
  transition: color var(--transition);
}

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

/* ========================================
   回到顶部
   ======================================== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: 50%;
  font-size: 1.3rem;
  cursor: pointer;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
  box-shadow: 0 4px 15px rgba(196, 30, 36, 0.3);
}

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

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

/* ========================================
   动画
   ======================================== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

/* ========================================
   响应式设计 - 平板
   ======================================== */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

  .clients-featured {
    grid-template-columns: repeat(3, 1fr);
  }

  .product-item {
    gap: 40px;
  }

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

/* ========================================
   响应式设计 - 小平板/大手机
   ======================================== */
@media (max-width: 768px) {
  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 1.6rem;
  }

  /* 导航 */
  .navbar-menu,
  .navbar-cta {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  /* Hero */
  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .stats-grid {
    gap: 30px;
  }

  .stat-number {
    font-size: 2rem;
  }

  /* 关于 */
  .about-content {
    flex-direction: column;
    gap: 30px;
  }

  .about-image {
    flex: none;
    width: 100%;
    max-height: 300px;
  }

  .about-tags {
    gap: 10px;
  }

  .about-tag {
    min-width: 100px;
    padding: 12px 16px;
  }

  /* 核心业务 */
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .service-card {
    padding: 24px 16px;
  }

  .service-icon {
    width: 56px;
    height: 56px;
    font-size: 1.4rem;
  }

  /* 服务领域 */
  .industries-grid {
    grid-template-columns: 1fr;
  }

  .ai-highlight-inner {
    flex-direction: column;
    text-align: center;
    padding: 30px 24px;
  }

  .ai-highlight-icon {
    width: 64px;
    height: 64px;
    font-size: 1.8rem;
  }

  /* 案例 */
  .cases-featured {
    grid-template-columns: 1fr;
  }

  .cases-other-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .cases-other {
    padding: 24px;
  }

  /* 软件产品 */
  .product-item,
  .product-reverse {
    flex-direction: column;
    gap: 24px;
  }

  .product-image {
    flex: none;
    width: 100%;
  }

  /* 合作客户 */
  .clients-featured {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .client-card {
    padding: 16px 12px;
  }

  .client-featured .client-name {
    font-size: 0.85rem;
  }

  /* 联系我们 */
  .contact-content {
    flex-direction: column;
    gap: 40px;
  }

  /* 页脚 */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

/* ========================================
   响应式设计 - 手机
   ======================================== */
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-title {
    font-size: 1.6rem;
  }

  .hero-subtitle {
    font-size: 0.9rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 240px;
  }

  .stats-grid {
    gap: 20px;
  }

  .stat-number {
    font-size: 1.6rem;
  }

  .stat-suffix {
    font-size: 1rem;
  }

  .services-grid {
    grid-template-columns: 1fr;
  }

  .about-tags {
    flex-direction: column;
  }

  .about-tag {
    display: flex;
    align-items: center;
    gap: 12px;
    text-align: left;
  }

  .tag-number {
    font-size: 1.2rem;
  }

  .cases-other-grid {
    grid-template-columns: 1fr;
  }

  .clients-featured {
    grid-template-columns: 1fr;
  }

  .cases-tabs {
    gap: 8px;
  }

  .tab-btn {
    padding: 8px 16px;
    font-size: 0.85rem;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    font-size: 1.1rem;
  }
}

/* ========================================
   大屏优化
   ======================================== */
@media (min-width: 1200px) {
  .hero-title {
    font-size: 3.6rem;
  }

  .hero-subtitle {
    font-size: 1.3rem;
  }
}