/* ============================================
   上海德惠锁具有限公司 - 企业官网样式
   简约大气 · 工业安防
   ============================================ */

/* ===== CSS Variables ===== */
:root {
  --color-primary: #1a3a5c;
  --color-primary-light: #2d5f8a;
  --color-primary-dark: #0f2438;
  --color-accent: #c8992e;
  --color-accent-light: #d4a93e;
  --color-dark: #0f1e2d;
  --color-text: #2c3e50;
  --color-text-light: #6b7c8c;
  --color-gray: #e8ecf0;
  --color-gray-light: #f5f7fa;
  --color-white: #ffffff;
  --color-success: #27ae60;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
  --transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --radius: 4px;
  --max-width: 1200px;
  --header-height: 72px;
}

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

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

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.7;
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

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

.section {
  padding: 80px 0;
}

.section-sm {
  padding: 50px 0;
}

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

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
  letter-spacing: 1px;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--color-text-light);
  margin-bottom: 50px;
}

.title-line {
  width: 50px;
  height: 3px;
  background: var(--color-accent);
  margin: 16px auto 0;
  border-radius: 2px;
}

.title-line.left {
  margin-left: 0;
}

/* ===== Header / Navigation ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: var(--transition);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.logo-icon {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
}

.logo-text {
  line-height: 1.3;
}

.logo-text .en {
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--color-text-light);
  letter-spacing: 1px;
  display: block;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  position: relative;
  padding: 8px 0;
}

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

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

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

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

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

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

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

/* ===== Hero Section ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
  overflow: hidden;
  padding-top: var(--header-height);
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='80' viewBox='0 0 80 80'%3E%3Cg fill='none' stroke='%23ffffff' stroke-width='0.5' opacity='0.05'%3E%3Cpath d='M40 10 L55 25 L55 55 L40 70 L25 55 L25 25 Z'/%3E%3Ccircle cx='40' cy='40' r='8'/%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}

.hero-content {
  position: relative;
  z-index: 2;
  color: var(--color-white);
  max-width: 680px;
}

.hero-tag {
  display: inline-block;
  padding: 6px 18px;
  background: rgba(200, 153, 46, 0.2);
  border: 1px solid rgba(200, 153, 46, 0.5);
  border-radius: 30px;
  font-size: 0.85rem;
  color: var(--color-accent-light);
  margin-bottom: 24px;
  letter-spacing: 2px;
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 20px;
  letter-spacing: 2px;
}

.hero-title .highlight {
  color: var(--color-accent);
}

.hero-desc {
  font-size: 1.1rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 36px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 32px;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  letter-spacing: 1px;
}

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

.btn-primary:hover {
  background: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(200, 153, 46, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border: 1px solid rgba(255, 255, 255, 0.4);
}

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

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

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

/* Hero stats */
.hero-stats {
  position: relative;
  z-index: 2;
  display: flex;
  gap: 50px;
  margin-top: 60px;
  padding-top: 36px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  flex-wrap: wrap;
}

.hero-stat-num {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
}

.hero-stat-label {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 6px;
}

/* ===== Page Banner ===== */
.page-banner {
  position: relative;
  min-height: 320px;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  padding-top: var(--header-height);
  overflow: hidden;
}

.page-banner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='80' viewBox='0 0 80 80'%3E%3Cg fill='none' stroke='%23ffffff' stroke-width='0.5' opacity='0.05'%3E%3Cpath d='M40 10 L55 25 L55 55 L40 70 L25 55 L25 25 Z'/%3E%3Ccircle cx='40' cy='40' r='8'/%3E%3C/g%3E%3C/svg%3E");
}

.page-banner-content {
  position: relative;
  z-index: 2;
  color: var(--color-white);
}

.page-banner h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: 2px;
}

.page-banner p {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: 1px;
}

.breadcrumb {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
  margin-top: 16px;
}

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

.breadcrumb span {
  color: rgba(255, 255, 255, 0.4);
}

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

.intro-text h2 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 20px;
  line-height: 1.4;
}

.intro-text p {
  color: var(--color-text-light);
  margin-bottom: 16px;
  line-height: 1.9;
}

.intro-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 30px;
}

.intro-feature {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.intro-feature-icon {
  width: 40px;
  height: 40px;
  background: var(--color-gray-light);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-primary);
}

.intro-feature-text h4 {
  font-size: 0.95rem;
  color: var(--color-primary-dark);
  margin-bottom: 4px;
}

.intro-feature-text p {
  font-size: 0.82rem;
  color: var(--color-text-light);
  margin: 0;
}

.intro-visual {
  position: relative;
}

.intro-visual-card {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-radius: 8px;
  padding: 50px 40px;
  color: var(--color-white);
  position: relative;
  overflow: hidden;
}

.intro-visual-card::before {
  content: "";
  position: absolute;
  top: -50px;
  right: -50px;
  width: 200px;
  height: 200px;
  background: rgba(200, 153, 46, 0.1);
  border-radius: 50%;
}

.intro-visual-num {
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 8px;
}

.intro-visual-label {
  font-size: 1rem;
  margin-bottom: 30px;
  color: rgba(255, 255, 255, 0.8);
}

.intro-visual-list {
  list-style: none;
  position: relative;
  z-index: 1;
}

.intro-visual-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.9rem;
}

.intro-visual-list li:last-child {
  border-bottom: none;
}

.intro-visual-list li::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  flex-shrink: 0;
}

/* ===== Products Grid ===== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.product-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: 8px;
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}

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

.product-card-img {
  height: 200px;
  background: var(--color-gray-light);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.product-card-img svg {
  width: 80px;
  height: 80px;
  color: var(--color-primary);
  transition: var(--transition);
}

.product-card:hover .product-card-img svg {
  transform: scale(1.1);
  color: var(--color-accent);
}

.product-card-body {
  padding: 20px;
}

.product-card-body h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

.product-card-body p {
  font-size: 0.85rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

.product-card-tag {
  display: inline-block;
  font-size: 0.75rem;
  padding: 3px 10px;
  background: var(--color-gray-light);
  color: var(--color-primary);
  border-radius: 20px;
  margin-top: 12px;
  font-weight: 500;
}

/* ===== Advantages Section ===== */
.advantages {
  background: var(--color-gray-light);
}

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

.advantage-item {
  text-align: center;
  padding: 30px 20px;
  background: var(--color-white);
  border-radius: 8px;
  transition: var(--transition);
  border-bottom: 3px solid transparent;
}

.advantage-item:hover {
  border-bottom-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.advantage-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: var(--color-gray-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  transition: var(--transition);
}

.advantage-item:hover .advantage-icon {
  background: var(--color-primary);
  color: var(--color-white);
}

.advantage-icon svg {
  width: 30px;
  height: 30px;
}

.advantage-item h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 10px;
}

.advantage-item p {
  font-size: 0.85rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ===== Application Areas ===== */
.applications-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.application-card {
  position: relative;
  height: 240px;
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  display: flex;
  align-items: flex-end;
  padding: 24px;
  color: var(--color-white);
  transition: var(--transition);
}

.application-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to top, rgba(15, 30, 45, 0.85) 0%, rgba(15, 30, 45, 0.2) 60%, transparent 100%);
  z-index: 1;
}

.application-card-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  transition: transform 0.6s ease;
}

.application-card:hover .application-card-bg {
  transform: scale(1.08);
}

.application-card-content {
  position: relative;
  z-index: 2;
}

.application-card-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.application-card-content p {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.8);
}

/* ===== CTA Section ===== */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: var(--color-white);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='80' viewBox='0 0 80 80'%3E%3Cg fill='none' stroke='%23ffffff' stroke-width='0.5' opacity='0.05'%3E%3Cpath d='M40 10 L55 25 L55 55 L40 70 L25 55 L25 25 Z'/%3E%3Ccircle cx='40' cy='40' r='8'/%3E%3C/g%3E%3C/svg%3E");
}

.cta-section .container {
  position: relative;
  z-index: 1;
}

.cta-section h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: 1px;
}

.cta-section p {
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 30px;
}

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

.about-story-text h2 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 20px;
}

.about-story-text p {
  color: var(--color-text-light);
  margin-bottom: 16px;
  line-height: 1.9;
}

.about-story-visual {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-radius: 8px;
  padding: 40px;
  color: var(--color-white);
  position: relative;
  overflow: hidden;
}

.about-story-visual::before {
  content: "";
  position: absolute;
  bottom: -60px;
  right: -60px;
  width: 220px;
  height: 220px;
  border: 2px solid rgba(200, 153, 46, 0.15);
  border-radius: 50%;
}

.about-story-visual::after {
  content: "";
  position: absolute;
  bottom: -30px;
  right: -30px;
  width: 160px;
  height: 160px;
  border: 2px solid rgba(200, 153, 46, 0.1);
  border-radius: 50%;
}

.about-story-stat {
  margin-bottom: 24px;
  position: relative;
  z-index: 1;
}

.about-story-stat-num {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
}

.about-story-stat-label {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 4px;
}

/* Timeline */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding: 20px 0;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  background: var(--color-gray);
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  width: 50%;
  padding: 0 40px 40px 0;
  text-align: right;
}

.timeline-item:nth-child(even) {
  left: 50%;
  padding: 0 0 40px 40px;
  text-align: left;
}

.timeline-item::before {
  content: "";
  position: absolute;
  top: 6px;
  right: -7px;
  width: 14px;
  height: 14px;
  background: var(--color-accent);
  border: 3px solid var(--color-white);
  border-radius: 50%;
  box-shadow: 0 0 0 2px var(--color-accent);
  z-index: 1;
}

.timeline-item:nth-child(even)::before {
  right: auto;
  left: -7px;
}

.timeline-year {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.timeline-content h4 {
  font-size: 1rem;
  color: var(--color-primary-dark);
  margin-bottom: 6px;
}

.timeline-content p {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

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

.culture-card {
  text-align: center;
  padding: 40px 30px;
  background: var(--color-gray-light);
  border-radius: 8px;
  transition: var(--transition);
}

.culture-card:hover {
  background: var(--color-white);
  box-shadow: var(--shadow-md);
}

.culture-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  color: var(--color-accent);
}

.culture-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
}

.culture-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

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

.cert-item {
  background: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: 8px;
  padding: 30px 20px;
  text-align: center;
  transition: var(--transition);
}

.cert-item:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.cert-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  color: var(--color-primary);
}

.cert-item h4 {
  font-size: 0.95rem;
  color: var(--color-primary-dark);
  margin-bottom: 6px;
}

.cert-item p {
  font-size: 0.8rem;
  color: var(--color-text-light);
}

/* ===== Products Page ===== */
.products-page-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.product-page-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: 8px;
  overflow: hidden;
  transition: var(--transition);
}

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

.product-page-card-img {
  height: 220px;
  background: linear-gradient(135deg, var(--color-gray-light) 0%, #e0e6ec 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.product-page-card-img svg {
  width: 90px;
  height: 90px;
  color: var(--color-primary);
  opacity: 0.8;
  transition: var(--transition);
}

.product-page-card:hover .product-page-card-img svg {
  transform: scale(1.1);
  color: var(--color-accent);
  opacity: 1;
}

.product-page-card-body {
  padding: 24px;
}

.product-page-card-body h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

.product-page-card-body p {
  font-size: 0.85rem;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 14px;
}

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

.product-features-list li {
  font-size: 0.75rem;
  padding: 3px 10px;
  background: var(--color-gray-light);
  color: var(--color-text-light);
  border-radius: 20px;
}

/* Product category filter */
.product-filter {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.filter-btn {
  padding: 8px 20px;
  font-size: 0.9rem;
  border: 1px solid var(--color-gray);
  border-radius: 30px;
  background: var(--color-white);
  color: var(--color-text);
  cursor: pointer;
  transition: var(--transition);
}

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

/* Solutions / Services bar */
.services-bar {
  background: var(--color-gray-light);
}

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

.service-bar-item {
  text-align: center;
  padding: 20px;
}

.service-bar-icon {
  width: 50px;
  height: 50px;
  margin: 0 auto 14px;
  color: var(--color-accent);
}

.service-bar-item h4 {
  font-size: 1rem;
  color: var(--color-primary-dark);
  margin-bottom: 6px;
}

.service-bar-item p {
  font-size: 0.82rem;
  color: var(--color-text-light);
}

/* ===== Contact Page ===== */
.contact-info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-bottom: 60px;
}

.contact-info-card {
  text-align: center;
  padding: 36px 24px;
  background: var(--color-gray-light);
  border-radius: 8px;
  transition: var(--transition);
}

.contact-info-card:hover {
  background: var(--color-white);
  box-shadow: var(--shadow-md);
}

.contact-info-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  background: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
}

.contact-info-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 10px;
}

.contact-info-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

.contact-form-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: start;
}

.contact-form {
  background: var(--color-white);
  padding: 40px;
  border-radius: 8px;
  box-shadow: var(--shadow-md);
}

.contact-form h3 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 24px;
}

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

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 8px;
}

.form-group label .required {
  color: #e74c3c;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  font-size: 0.9rem;
  border: 1px solid var(--color-gray);
  border-radius: var(--radius);
  background: var(--color-gray-light);
  transition: var(--transition);
  font-family: inherit;
  color: var(--color-text);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary-light);
  background: var(--color-white);
  box-shadow: 0 0 0 3px rgba(45, 95, 138, 0.1);
}

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

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

.form-success {
  display: none;
  padding: 16px;
  background: #e8f8f0;
  border: 1px solid #27ae60;
  border-radius: var(--radius);
  color: #27ae60;
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.form-success.show {
  display: block;
}

.contact-map {
  height: 100%;
  min-height: 400px;
  background: var(--color-gray-light);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.contact-map iframe {
  width: 100%;
  height: 100%;
  min-height: 400px;
  border: none;
}

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

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.footer-brand p {
  font-size: 0.85rem;
  line-height: 1.8;
  margin-bottom: 20px;
}

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

.footer-social a {
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.6);
}

.footer-social a:hover {
  background: var(--color-accent);
  color: var(--color-white);
}

.footer-social svg {
  width: 18px;
  height: 18px;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 18px;
}

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

.footer-col ul li a {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
}

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

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
}

.footer-contact-item svg {
  width: 16px;
  height: 16px;
  flex-shrink:: 0;
  margin-top: 4px;
  color: var(--color-accent);
}

.footer-bottom {
  padding: 20px 0;
  text-align: center;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.4);
}

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

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

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

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.fade-in-up {
  animation: fadeInUp 0.8s ease forwards;
}

.fade-in {
  animation: fadeIn 1s ease forwards;
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 992px) {
  .products-grid,
  .advantages-grid,
  .certifications-grid,
  .services-bar-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .applications-grid,
  .culture-grid,
  .products-page-grid,
  .contact-info-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .intro-section,
  .about-story,
  .contact-form-section {
    grid-template-columns: 1fr;
  }

  .intro-visual,
  .about-story-visual {
    order: -1;
  }

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

  .hero-title {
    font-size: 2.2rem;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: var(--color-white);
    flex-direction: column;
    padding: 20px 24px;
    gap: 0;
    box-shadow: var(--shadow-md);
    transform: translateY(-200%);
    transition: var(--transition);
    height: auto;
  }

  .nav-menu.active {
    transform: translateY(0);
  }

  .nav-menu .nav-link {
    width: 100%;
    padding: 14px 0;
    border-bottom: 1px solid var(--color-gray);
  }

  .nav-toggle {
    display: flex;
  }

  .section {
    padding: 50px 0;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .hero-title {
    font-size: 1.8rem;
  }

  .hero-desc {
    font-size: 0.95rem;
  }

  .hero-stats {
    gap: 30px;
  }

  .hero-stat-num {
    font-size: 1.6rem;
  }

  .page-banner h1 {
    font-size: 1.8rem;
  }

  .products-grid,
  .advantages-grid,
  .certifications-grid,
  .services-bar-grid,
  .applications-grid,
  .culture-grid,
  .products-page-grid,
  .contact-info-grid {
    grid-template-columns: 1fr;
  }

  .intro-features {
    grid-template-columns: 1fr;
  }

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

  .form-row {
    grid-template-columns: 1fr;
  }

  .timeline::before {
    left: 20px;
  }

  .timeline-item,
  .timeline-item:nth-child(even) {
    width: 100%;
    left: 0;
    padding: 0 0 30px 50px;
    text-align: left;
  }

  .timeline-item::before,
  .timeline-item:nth-child(even)::before {
    left: 13px;
    right: auto;
  }

  .contact-form {
    padding: 24px;
  }
}

@media (max-width: 480px) {
  .hero-btns {
    flex-direction: column;
    width: 100%;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .hero-stats {
    flex-direction: column;
    gap: 20px;
  }
}