/* ===========================
   CSS Variables & Reset
   =========================== */
:root {
  --primary: #FF6B00;
  --primary-dark: #E55D00;
  --primary-light: #FFF3E8;
  --primary-rgb: 255, 107, 0;

  --text-dark: #333333;
  --text-body: #555555;
  --text-light: #888888;

  --bg-white: #FFFFFF;
  --bg-gray: #F7F8FA;
  --bg-dark: #2D2D2D;

  --border-color: #E8E8E8;

  --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --max-width: 1200px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);

  --transition: 0.3s ease;
  --navbar-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--navbar-height);
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-body);
  background: var(--bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
  list-style: none;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
}

input,
textarea {
  font-family: inherit;
  font-size: inherit;
}

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

.btn {
  display: inline-block;
  padding: 12px 32px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  cursor: pointer;
  text-align: center;
  border: 2px solid transparent;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.4);
}

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

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

.btn-block {
  display: block;
  width: 100%;
}

.section {
  padding: 100px 0;
}

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

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

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

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--primary);
  border-radius: 2px;
  margin: 16px auto 0;
}

.section-desc {
  font-size: 18px;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* ===========================
   Navbar
   =========================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1000;
  transition: box-shadow var(--transition);
}

.navbar.scrolled {
  box-shadow: var(--shadow-sm);
}

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

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--text-dark);
}

.navbar-logo {
  width: 40px;
  height: 40px;
}

.navbar-company {
  font-size: 20px;
  letter-spacing: 1px;
  color: var(--primary);
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  display: block;
  padding: 8px 18px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-body);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

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

.nav-link.active {
  background: var(--primary-light);
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 14px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-light);
  transition: all var(--transition);
}

.lang-switch:hover {
  border-color: var(--primary);
}

.lang-option {
  transition: color var(--transition);
}

.lang-option.active {
  color: var(--primary);
}

.lang-separator {
  color: var(--border-color);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: all var(--transition);
}

.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);
}

/* ===========================
   Hero
   =========================== */
.hero {
  position: relative;
  min-height: 40vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #FF6B00 0%, #FF8C40 40%, #FFB380 70%, #666666 100%);
  overflow: hidden;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 30% 50%, rgba(255,107,0,0.3) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 30%, rgba(100,100,100,0.2) 0%, transparent 50%);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 120px 24px 80px;
}

.hero-title {
  font-size: 52px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 24px;
  line-height: 1.2;
  text-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.hero-subtitle {
  font-size: 20px;
  color: rgba(255,255,255,0.9);
  max-width: 650px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

.hero-cta {
  font-size: 18px;
  padding: 14px 40px;
  background: #fff;
  color: var(--primary);
  border-color: #fff;
}

.hero-cta:hover {
  background: transparent;
  color: #fff;
  border-color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

.hero-wave {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  z-index: 3;
}

.hero-wave svg {
  display: block;
  width: 100%;
  height: 80px;
}

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

.about-heading {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 20px;
}

.about-paragraph {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-body);
  margin-bottom: 16px;
}

.about-stats {
  display: flex;
  gap: 40px;
  margin-top: 36px;
  padding-top: 36px;
  border-top: 1px solid var(--border-color);
}

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

.stat-number {
  display: block;
  font-size: 42px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}

.stat-suffix {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
}

.stat-label {
  display: block;
  font-size: 14px;
  color: var(--text-light);
  margin-top: 8px;
}

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

.about-illustration {
  width: 100%;
  max-width: 450px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

/* ===========================
   Services
   =========================== */
.services {
  background: var(--bg-gray);
}

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

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

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.service-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 24px;
}

.service-icon svg {
  width: 100%;
  height: 100%;
}

.service-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 12px;
}

.service-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-light);
}

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

.news-card {
  background: var(--bg-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
  border: 1px solid var(--border-color);
}

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

.news-image {
  overflow: hidden;
}

.news-image svg {
  display: block;
  width: 100%;
  height: auto;
  transition: transform var(--transition);
}

.news-card:hover .news-image svg {
  transform: scale(1.05);
}

.news-body {
  padding: 24px;
}

.news-date {
  font-size: 13px;
  color: var(--text-light);
}

.news-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-dark);
  margin: 10px 0;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-excerpt {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 16px;
}

.news-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
}

.news-link:hover {
  color: var(--primary-dark);
}

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

/* ===========================
   Contact
   =========================== */
.contact {
  background: var(--bg-gray);
}

.contact-grid {
  max-width: 600px;
  margin: 0 auto;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

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

.contact-icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  background: var(--primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
}

.contact-icon svg {
  width: 100%;
  height: 100%;
}

.contact-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 4px;
}

.contact-value {
  font-size: 15px;
  color: var(--text-body);
}

/* Contact Form */
.contact-form-wrapper {
  background: var(--bg-white);
  padding: 40px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

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

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--text-dark);
  background: var(--bg-white);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

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

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: #bbb;
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

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

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

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

.footer-logo {
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
}

.footer-brand h3 {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.footer-slogan {
  font-size: 14px;
  color: rgba(255,255,255,0.5);
}

.footer-links h4,
.footer-contact h4 {
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 20px;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
}

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

.footer-contact p {
  font-size: 14px;
  margin-bottom: 8px;
  color: rgba(255,255,255,0.6);
}

.footer-bottom {
  padding: 24px 0;
  text-align: center;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
}

.footer-separator {
  margin: 0 12px;
}

.footer-icp {
  margin-top: 8px;
}

/* ===========================
   Back to Top
   =========================== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  transition: all var(--transition);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  z-index: 900;
}

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

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

.back-to-top svg {
  width: 20px;
  height: 20px;
}

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

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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