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

:root {
  --gold: #b8862f;
  --gold-light: #e8d4a0;
  --gold-bg: #faf6ec;
  --dark: #1a1a1a;
  --gray: #666;
  --gray-light: #999;
  --border: #e8e0cc;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--dark);
  background: #fff;
  line-height: 1.6;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 40px;
}

/* ========== Navbar ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #f0f0f0;
  z-index: 1000;
}

.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 40px;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: contain;
  display: block;
}

.logo-text {
  font-size: 18px;
  font-weight: 600;
  color: var(--dark);
  letter-spacing: 1px;
}

.logo-sub {
  font-size: 10px;
  color: var(--gray-light);
  letter-spacing: 2px;
  display: block;
}

.nav-menu {
  display: flex;
  gap: 40px;
  list-style: none;
}

.nav-menu a {
  text-decoration: none;
  color: var(--dark);
  font-size: 17px;
  font-weight: 500;
  padding: 24px 0;
  position: relative;
  transition: color 0.2s;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--gold);
}

.nav-menu a.active::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gold);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--dark);
  margin: 5px 0;
  transition: 0.3s;
}

/* ========== Hero ========== */
.hero {
  min-height: 70vh;
  padding-top: 70px;
  background: url("背景.png") center center / cover no-repeat;
  background-position: center center;
  background-size: cover;
  background-repeat: no-repeat;
  background-attachment: scroll;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: flex-start;
  width: 100%;
}

.hero .container {
  margin: 0 auto;
  width: 100%;
  max-width: 1280px;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  padding: 80px 0 80px;
  text-align: left;
}

.section-tag {
  display: inline-block;
  font-size: 13px;
  color: var(--gold);
  letter-spacing: 3px;
  font-weight: 500;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(48px, 10vw, 120px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 4px;
  margin-bottom: 32px;
  color: var(--dark);
}

.hero-subtitle {
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 20px;
}

.hero-desc {
  font-size: clamp(15px, 1.6vw, 18px);
  color: var(--gray);
  letter-spacing: 2px;
  margin-bottom: 40px;
}

.btn-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 28px;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.25s;
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background: var(--gold);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(184, 134, 47, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--dark);
  border: 1px solid var(--dark);
}

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

/* ========== Section Common ========== */
.section {
  padding: 100px 0;
  background: #fff;
}

.section-wrap {
  background: linear-gradient(135deg, #fff 0%, #faf6ec 100%);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 48px;
  gap: 20px;
  flex-wrap: wrap;
}

.section-title {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 700;
  color: var(--dark);
}

.section-meta {
  font-size: 13px;
  color: var(--gray-light);
  letter-spacing: 2px;
  white-space: nowrap;
}

/* ========== Cards Grid ========== */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 36px 32px;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(184, 134, 47, 0.12);
  border-color: var(--gold-light);
}

.card:hover::before {
  opacity: 1;
}

.card-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background: var(--gold-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.card-icon svg {
  width: 28px;
  height: 28px;
}

.card-step {
  font-size: 12px;
  color: var(--gold);
  letter-spacing: 2px;
  font-weight: 500;
  margin-bottom: 12px;
}

.card-step-gold {
  letter-spacing: 1px;
  color: var(--gold);
}

.card-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--dark);
}

.card-desc {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.7;
  margin-bottom: 20px;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--gold);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: gap 0.2s;
}

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

/* ========== Split Section ========== */
.split-section {
  padding: 100px 0;
  background: linear-gradient(135deg, #fff 0%, #faf6ec 100%);
  position: relative;
  overflow: hidden;
}

.split-section::before {
  content: "";
  position: absolute;
  left: -200px;
  bottom: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(
    circle,
    rgba(184, 134, 47, 0.08),
    transparent 70%
  );
  pointer-events: none;
}

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

.split-content .section-tag {
  margin-bottom: 20px;
}

.split-content h2 {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 24px;
  color: var(--dark);
}

.split-content p {
  font-size: 16px;
  color: var(--gray);
  margin-bottom: 36px;
  max-width: 520px;
}

.split-visual {
  position: relative;
  height: 440px;
}

.visual-card {
  width: 100%;
  height: 100%;
  background: #fff;
  border-radius: 24px;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 40px;
  overflow: hidden;
}

.visual-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at 70% 50%,
    rgba(232, 212, 160, 0.3),
    transparent 60%
  );
  pointer-events: none;
}

/* Industry visual */
.industry-diagram {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.center-node {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: linear-gradient(135deg, #d4a554, #b8862f);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 600;
  position: relative;
  z-index: 2;
  box-shadow: 0 8px 32px rgba(184, 134, 47, 0.4);
}

.node-label {
  position: absolute;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 22px;
  font-size: 14px;
  color: var(--dark);
  font-weight: 500;
  white-space: nowrap;
  z-index: 1;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.node-1 {
  top: 10%;
  left: 15%;
}
.node-2 {
  top: 10%;
  right: 15%;
}
.node-3 {
  bottom: 10%;
  left: 15%;
}
.node-4 {
  bottom: 10%;
  right: 15%;
}

/* Raw material visual */
.raw-visual {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #d4a554 0%, #8b6525 100%);
  border-radius: 20px;
  position: relative;
  overflow: hidden;
}

.raw-visual-content {
  position: absolute;
  bottom: 40px;
  left: 40px;
  color: #fff;
  z-index: 2;
}

.raw-visual-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
}

.raw-visual-sub {
  font-size: 13px;
  letter-spacing: 3px;
  opacity: 0.85;
}

.raw-pattern {
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(
      90deg,
      rgba(255, 255, 255, 0.08) 0,
      rgba(255, 255, 255, 0.08) 40px,
      transparent 40px,
      transparent 50px
    ),
    repeating-linear-gradient(
      0deg,
      rgba(255, 255, 255, 0.05) 0,
      rgba(255, 255, 255, 0.05) 40px,
      transparent 40px,
      transparent 50px
    );
}

.raw-circle {
  position: absolute;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.15);
}

.raw-circle-1 {
  width: 200px;
  height: 200px;
  top: -60px;
  right: -40px;
}
.raw-circle-2 {
  width: 150px;
  height: 150px;
  bottom: -40px;
  left: -30px;
}

/* Digital visual */
.digital-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--gold-bg) 0%, #fff 100%);
  border-radius: 24px;
}

.digital-phone {
  position: relative;
  z-index: 2;
  width: 220px;
  height: 420px;
  background: var(--dark);
  border-radius: 32px;
  padding: 10px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.digital-phone-screen {
  width: 100%;
  height: 100%;
  background: #fff;
  border-radius: 24px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.digital-phone-header {
  background: linear-gradient(135deg, var(--gold) 0%, #d4a554 100%);
  padding: 20px 20px 30px;
  color: #fff;
}

.digital-phone-header h4 {
  font-size: 18px;
  margin-bottom: 4px;
}

.digital-phone-header p {
  font-size: 11px;
  opacity: 0.9;
  letter-spacing: 1px;
}

.digital-phone-body {
  padding: 16px;
  flex: 1;
}

.digital-phone-apps {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

.digital-app {
  flex: 1;
  background: var(--gold-bg);
  border-radius: 10px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: var(--gold);
  font-weight: 500;
}

.digital-phone-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.digital-list-item {
  height: 10px;
  background: var(--gold-bg);
  border-radius: 5px;
}

.digital-list-item:nth-child(2) {
  width: 80%;
}
.digital-list-item:nth-child(3) {
  width: 60%;
}
.digital-list-item-4 {
  width: 70%;
}

.digital-orbits {
  position: absolute;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  border: 1px solid var(--gold-light);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
  opacity: 0.5;
}

.digital-orbits::before,
.digital-orbits::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--gold-light);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.digital-orbits::before {
  width: 280px;
  height: 280px;
}
.digital-orbits::after {
  width: 180px;
  height: 180px;
}

/* About visual */
.about-visual {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-logo-wrap {
  position: relative;
  width: 260px;
  height: 260px;
}

.about-orbit {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--gold-light);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.about-orbit-1 {
  width: 100%;
  height: 100%;
  opacity: 0.6;
}
.about-orbit-2 {
  width: 75%;
  height: 75%;
  opacity: 0.4;
}
.about-orbit-3 {
  width: 50%;
  height: 50%;
  opacity: 0.3;
}

.about-logo-circle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 140px;
  height: 140px;
  background: var(--gold-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 32px rgba(255, 255, 255, 0.1);
}

.about-logo-circle img {
  width: 140px;
  height: 140px;
  object-fit: contain;
}

/* ========== Footer ========== */
.footer {
  background: var(--dark);
  color: #fff;
  padding: 70px 0 30px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 60px;
  padding-bottom: 50px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .logo-text {
  color: #fff;
}
.footer-brand .logo-sub {
  color: rgba(255, 255, 255, 0.5);
}

.footer-tagline {
  margin-top: 20px;
  color: rgba(255, 255, 255, 0.6);
  font-size: 14px;
  line-height: 1.8;
}

.footer-col h5 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 20px;
  color: #fff;
}

.footer-col ul {
  list-style: none;
}
.footer-col li {
  margin-bottom: 12px;
}

.footer-col a {
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}

.footer-col a:hover {
  color: var(--gold-light);
}

.footer-bottom {
  padding-top: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: rgba(255, 255, 255, 0.4);
  font-size: 13px;
  flex-wrap: wrap;
  gap: 12px;
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .cards {
    grid-template-columns: repeat(2, 1fr);
  }
  .split-wrapper {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .split-visual {
    height: 360px;
    order: -1;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .container,
  .nav-inner {
    padding: 0 24px;
  }

  .menu-toggle {
    display: block;
    z-index: 1001;
  }
  .menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  .menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  .menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background: #fff;
    flex-direction: column;
    padding: 90px 32px 32px;
    gap: 0;
    box-shadow: -8px 0 32px rgba(0, 0, 0, 0.1);
    transition: right 0.3s;
  }

  .nav-menu.open {
    right: 0;
  }
  .nav-menu li {
    border-bottom: 1px solid #f0f0f0;
  }
  .nav-menu a {
    display: block;
    padding: 18px 0;
    font-size: 16px;
  }
  .nav-menu a.active::after {
    display: none;
  }

  .hero {
    padding-top: 70px;
    min-height: auto;
    padding-bottom: 60px;
    background-position: center center;
  }
  .hero-content {
    padding: 40px 0 280px;
    padding-left: 0;
    max-width: 100%;
  }
  .section,
  .split-section {
    padding: 70px 0;
  }
  .cards {
    grid-template-columns: 1fr;
  }
  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .node-label {
    padding: 10px 16px;
    font-size: 12px;
  }
  .center-node {
    width: 100px;
    height: 100px;
    font-size: 16px;
  }
  .node-1 {
    top: 5%;
    left: 5%;
  }
  .node-2 {
    top: 5%;
    right: 5%;
  }
  .node-3 {
    bottom: 5%;
    left: 5%;
  }
  .node-4 {
    bottom: 5%;
    right: 5%;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .hero {
    min-height: 60vh;
    background-position: center center;
  }
  .hero-content {
    padding: 60px 0 200px;
  }
  .hero-title {
    font-size: 56px;
  }
  .hero-subtitle {
    font-size: 20px;
  }
  .hero-desc {
    font-size: 14px;
  }
  .btn {
    padding: 12px 22px;
    font-size: 14px;
  }
  .split-visual {
    height: 280px;
  }
  .card {
    padding: 28px 24px;
  }
}