/* ============================================
   太太乐全屋定制 - 品牌官网样式表
   主体：奢华家居（江苏）有限公司
   品牌色：#E8712A（暖橙）+ #2C2C2C（深灰）
   ============================================ */

/* CSS Variables */
:root {
  --primary: #E8712A;
  --primary-dark: #D45E1A;
  --primary-light: #F5A623;
  --dark: #2C2C2C;
  --dark-light: #4A4A4A;
  --gray: #6B6B6B;
  --gray-light: #999999;
  --bg-light: #F8F6F3;
  --bg-white: #FFFFFF;
  --border: #E5E0DA;
  --shadow: rgba(0, 0, 0, 0.08);
  --font-cn: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-en: "Georgia", "Times New Roman", serif;
  --transition: all 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: var(--font-cn);
  color: var(--dark);
  line-height: 1.6;
  background: var(--bg-white);
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ============================================
   Header / Navigation
   ============================================ */
.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 10px var(--shadow);
  transition: var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-area img {
  height: 50px;
  width: auto;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-text .brand-cn {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 2px;
}

.logo-text .brand-en {
  font-family: var(--font-en);
  font-size: 12px;
  color: var(--gray);
  letter-spacing: 1px;
  margin-top: -2px;
}

/* Navigation */
.nav-list {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-list a {
  font-size: 15px;
  color: var(--dark);
  font-weight: 500;
  position: relative;
  padding: 5px 0;
}

.nav-list a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.3s ease;
}

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

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

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}

.menu-toggle span {
  width: 25px;
  height: 2px;
  background: var(--dark);
  transition: var(--transition);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  overflow: hidden;
  margin-top: 80px;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(44, 44, 44, 0.7) 0%, rgba(44, 44, 44, 0.3) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  color: #fff;
  max-width: 650px;
  padding-left: 60px;
}

.hero-tag {
  display: inline-block;
  font-size: 14px;
  letter-spacing: 3px;
  text-transform: uppercase;
  border: 1px solid rgba(232, 113, 42, 0.6);
  padding: 6px 18px;
  margin-bottom: 24px;
  color: var(--primary-light);
  font-weight: 300;
}

.hero-title {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-title span {
  color: var(--primary-light);
}

.hero-subtitle {
  font-size: 18px;
  line-height: 1.8;
  margin-bottom: 36px;
  opacity: 0.9;
  font-weight: 300;
}

.hero-buttons {
  display: flex;
  gap: 16px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 36px;
  font-size: 15px;
  font-weight: 500;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-family: var(--font-cn);
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(232, 113, 42, 0.3);
}

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

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #fff;
}

.btn-dark {
  background: var(--dark);
  color: #fff;
}

.btn-dark:hover {
  background: var(--dark-light);
  transform: translateY(-2px);
}

/* ============================================
   Section Common Styles
   ============================================ */
.section {
  padding: 100px 0;
}

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

.section-tag {
  font-size: 13px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--gray);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
}

.section-divider {
  width: 60px;
  height: 3px;
  background: var(--primary);
  margin: 16px auto 20px;
}

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

/* ============================================
   About Section
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-image {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
}

.about-image img {
  width: 100%;
  height: 400px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

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

.about-content h3 {
  font-size: 28px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 20px;
  line-height: 1.4;
}

.about-content p {
  font-size: 15px;
  color: var(--gray);
  line-height: 2;
  margin-bottom: 16px;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 32px;
}

.stat-item {
  text-align: center;
  padding: 20px 0;
  border-top: 2px solid var(--primary);
}

.stat-number {
  font-size: 36px;
  font-weight: 700;
  color: var(--primary);
  font-family: var(--font-en);
  line-height: 1;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 14px;
  color: var(--gray);
}

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

.product-card {
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 20px var(--shadow);
  transition: var(--transition);
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
}

.product-card .image-wrapper {
  overflow: hidden;
  height: 260px;
}

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

.product-card:hover .image-wrapper img {
  transform: scale(1.1);
}

.product-info {
  padding: 24px;
}

.product-info .category {
  font-size: 12px;
  color: var(--primary);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.product-info h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 10px;
}

.product-info p {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.7;
}

.product-info .btn-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-size: 14px;
  color: var(--primary);
  font-weight: 500;
}

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

/* ============================================
   Features / Advantages Section
   ============================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.feature-card {
  text-align: center;
  padding: 40px 24px;
  background: #fff;
  border-radius: 8px;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px var(--shadow);
}

.feature-icon {
  width: 70px;
  height: 70px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: #fff;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--dark);
}

.feature-card p {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.7;
}

/* ============================================
   Cases / Portfolio Section
   ============================================ */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.case-card {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  height: 320px;
  cursor: pointer;
}

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

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

.case-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: 40px 24px 24px;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
  color: #fff;
  transform: translateY(20px);
  opacity: 0;
  transition: var(--transition);
}

.case-card:hover .case-overlay {
  transform: translateY(0);
  opacity: 1;
}

.case-overlay h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 6px;
}

.case-overlay p {
  font-size: 13px;
  opacity: 0.8;
}

/* ============================================
   Process Section
   ============================================ */
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  position: relative;
}

.process-steps::before {
  content: '';
  position: absolute;
  top: 40px;
  left: 15%;
  width: 70%;
  height: 2px;
  background: var(--border);
}

.process-step {
  text-align: center;
  position: relative;
}

.step-number {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  background: var(--bg-white);
  border: 2px solid var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
  position: relative;
  z-index: 1;
}

.process-step h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--dark);
}

.process-step p {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.7;
}

/* ============================================
   Contact Section
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-info h3 {
  font-size: 28px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 20px;
}

.contact-info > p {
  font-size: 15px;
  color: var(--gray);
  line-height: 1.8;
  margin-bottom: 32px;
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.contact-item .icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: #fff;
}

.contact-item .info h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 4px;
}

.contact-item .info p {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.6;
}

.contact-form {
  background: #fff;
  padding: 40px;
  border-radius: 8px;
  box-shadow: 0 4px 30px var(--shadow);
}

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

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--dark);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  font-size: 14px;
  font-family: var(--font-cn);
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-light);
  transition: var(--transition);
  color: var(--dark);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(232, 113, 42, 0.1);
}

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

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

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--dark) 0%, #3a3a3a 100%);
  text-align: center;
  color: #fff;
}

.cta-section h2 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-section p {
  font-size: 16px;
  opacity: 0.8;
  margin-bottom: 32px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 60px 0 30px;
}

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

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

.footer-about .footer-logo img {
  height: 40px;
  background: #fff;
  padding: 4px 8px;
  border-radius: 4px;
}

.footer-about .footer-logo span {
  font-size: 18px;
  font-weight: 600;
  color: #fff;
}

.footer-about p {
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 16px;
}

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

.footer-social a {
  width: 36px;
  height: 36px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: var(--transition);
}

.footer-social a:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.footer h4 {
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 10px;
}

.footer h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--primary);
}

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

.footer-links a {
  font-size: 14px;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--primary);
  padding-left: 4px;
}

.footer-contact-info li {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
  font-size: 14px;
}

.footer-contact-info li span:first-child {
  min-width: 16px;
}

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

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

/* ============================================
   Page Banner (Sub-pages)
   ============================================ */
.page-banner {
  position: relative;
  height: 360px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  margin-top: 80px;
  overflow: hidden;
}

.page-banner img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-banner .overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(44, 44, 44, 0.65);
}

.page-banner .content {
  position: relative;
  z-index: 2;
}

.page-banner h1 {
  font-size: 40px;
  font-weight: 700;
  margin-bottom: 12px;
}

.page-banner .breadcrumb {
  font-size: 14px;
  opacity: 0.8;
}

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

.page-banner .breadcrumb a:hover {
  color: #fff;
}

/* ============================================
   About Page Specific
   ============================================ */
.about-intro {
  padding: 80px 0;
}

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

.about-intro-content h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--dark);
}

.about-intro-content p {
  font-size: 15px;
  color: var(--gray);
  line-height: 2;
  margin-bottom: 16px;
}

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

.value-card {
  padding: 32px;
  background: #fff;
  border-radius: 8px;
  text-align: center;
  box-shadow: 0 2px 20px var(--shadow);
  transition: var(--transition);
}

.value-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px var(--shadow);
}

.value-card h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 12px;
}

.value-card p {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.7;
}

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

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  width: 2px;
  height: 100%;
  background: var(--border);
  transform: translateX(-50%);
}

.timeline-item {
  display: flex;
  justify-content: flex-end;
  padding-right: 50%;
  position: relative;
  margin-bottom: 40px;
}

.timeline-item:nth-child(even) {
  justify-content: flex-start;
  padding-right: 0;
  padding-left: 50%;
}

.timeline-dot {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 16px;
  background: var(--primary);
  border: 3px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 3px var(--primary);
  z-index: 1;
}

.timeline-content {
  background: #fff;
  padding: 24px;
  border-radius: 8px;
  box-shadow: 0 2px 20px var(--shadow);
  margin-right: 30px;
  max-width: 350px;
}

.timeline-item:nth-child(even) .timeline-content {
  margin-right: 0;
  margin-left: 30px;
}

.timeline-content .year {
  font-size: 14px;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 8px;
}

.timeline-content h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 8px;
}

.timeline-content p {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.6;
}

/* ============================================
   Products Page Specific
   ============================================ */
.products-page-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.product-detail-card {
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 20px var(--shadow);
  transition: var(--transition);
}

.product-detail-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
}

.product-detail-card .img-wrap {
  height: 280px;
  overflow: hidden;
}

.product-detail-card .img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.product-detail-card:hover .img-wrap img {
  transform: scale(1.08);
}

.product-detail-card .detail-info {
  padding: 28px;
}

.product-detail-card .detail-info .cat {
  font-size: 12px;
  color: var(--primary);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.product-detail-card .detail-info h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 12px;
}

.product-detail-card .detail-info p {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.8;
  margin-bottom: 16px;
}

.product-detail-card .detail-info .tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.product-detail-card .detail-info .tags span {
  font-size: 12px;
  padding: 4px 12px;
  background: var(--bg-light);
  color: var(--gray);
  border-radius: 20px;
}

/* ============================================
   Cases Page Specific
   ============================================ */
.cases-page-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.case-detail-card {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  height: 350px;
  cursor: pointer;
}

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

.case-detail-card:hover img {
  transform: scale(1.08);
}

.case-detail-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: 60px 24px 24px;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.75));
  color: #fff;
}

.case-detail-overlay .style-tag {
  display: inline-block;
  font-size: 11px;
  padding: 3px 10px;
  background: var(--primary);
  border-radius: 20px;
  margin-bottom: 10px;
  letter-spacing: 1px;
}

.case-detail-overlay h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 6px;
}

.case-detail-overlay p {
  font-size: 13px;
  opacity: 0.8;
}

/* ============================================
   Back to Top
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(232, 113, 42, 0.3);
  z-index: 999;
  border: none;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-4px);
  background: var(--primary-dark);
}

/* ============================================
   Trademark Display
   ============================================ */
.trademark-section {
  text-align: center;
  padding: 60px 20px;
  background: linear-gradient(135deg, #faf8f5 0%, #f5f0ea 100%);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.trademark-section h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 24px;
}

.trademark-section h3 span {
  color: var(--primary);
}

.trademark-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}

.trademark-item {
  text-align: center;
}

.trademark-item img {
  height: 80px;
  width: auto;
  margin-bottom: 12px;
}

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

.trademark-item .reg-mark {
  font-size: 12px;
  color: var(--primary);
  font-weight: 600;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
  .products-grid,
  .features-grid,
  .cases-grid,
  .products-page-grid,
  .cases-page-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
  
  .about-stats {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .hero-title {
    font-size: 40px;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }
  
  .nav-list {
    display: none;
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    background: #fff;
    flex-direction: column;
    padding: 20px;
    box-shadow: 0 4px 20px var(--shadow);
    gap: 0;
  }
  
  .nav-list.active {
    display: flex;
  }
  
  .nav-list a {
    padding: 12px 0;
    border-bottom: 1px solid var(--bg-light);
  }
  
  .hero {
    min-height: 500px;
  }
  
  .hero-content {
    padding: 0 20px;
  }
  
  .hero-title {
    font-size: 32px;
  }
  
  .hero-subtitle {
    font-size: 15px;
  }
  
  .hero-buttons {
    flex-direction: column;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .section-title {
    font-size: 28px;
  }
  
  .about-grid,
  .about-intro-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .products-grid,
  .features-grid,
  .cases-grid,
  .products-page-grid,
  .cases-page-grid,
  .process-steps {
    grid-template-columns: 1fr;
  }
  
  .process-steps::before {
    display: none;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
  
  .page-banner {
    height: 280px;
  }
  
  .page-banner h1 {
    font-size: 30px;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .about-values {
    grid-template-columns: 1fr;
  }
  
  .timeline-item,
  .timeline-item:nth-child(even) {
    padding-left: 30px;
    padding-right: 0;
    justify-content: flex-start;
  }
  
  .timeline::before {
    left: 0;
  }
  
  .timeline-dot {
    left: 0;
  }
  
  .timeline-content,
  .timeline-item:nth-child(even) .timeline-content {
    margin: 0;
    max-width: 100%;
  }
  
  .about-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }
  
  .stat-number {
    font-size: 28px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 26px;
  }
  
  .section-title {
    font-size: 24px;
  }
  
  .about-stats {
    grid-template-columns: 1fr;
  }
}