/* ============================================================
   BEE VALLEY GROUP — 蜂谷集团官方网站
   极简风格 · 阿里橙 #FF6A00 + 白色
   ============================================================ */

:root {
  --brand-orange: #FF6A00;
  --brand-orange-light: #FFE8D6;
  --brand-orange-soft: #FFF4EC;
  --text-primary: #222222;
  --text-secondary: #666666;
  --text-tertiary: #999999;
  --border-light: #EEEEEE;
  --border-medium: #E5E5E5;
  --bg-white: #FFFFFF;
  --bg-soft: #FAFAFA;
  --bg-deep: #F5F5F5;
  --max-width: 1280px;
  --nav-height: 72px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 400;
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.en {
  font-family: "Outfit", "Noto Sans SC", sans-serif;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ========== 通用容器 ========== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 48px;
}

.section {
  padding: 120px 0;
  position: relative;
}

.section-label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--brand-orange);
  text-transform: uppercase;
  margin-bottom: 20px;
  display: block;
  font-family: "Outfit", sans-serif;
}

.section-title {
  font-size: 44px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.section-subtitle {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.8;
}

.section-header {
  margin-bottom: 72px;
}

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

.section-header.center .section-subtitle {
  margin: 0 auto;
}

/* ========== 导航栏 ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  z-index: 1000;
  transition: all 0.3s ease;
}

.navbar.scrolled {
  border-bottom-color: var(--border-light);
  box-shadow: 0 1px 20px rgba(0, 0, 0, 0.04);
}

.nav-container {
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
}

.nav-logo-img {
  height: 34px;
  width: auto;
  display: block;
}

.nav-logo-icon {
  width: 36px;
  height: 36px;
}

.nav-logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.nav-logo-cn {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 2px;
}

.nav-logo-en {
  font-size: 10px;
  font-weight: 500;
  color: var(--text-tertiary);
  letter-spacing: 1.5px;
  font-family: "Outfit", sans-serif;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 40px;
  list-style: none;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
  position: relative;
  cursor: pointer;
  padding: 6px 0;
}

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

.nav-link.active {
  color: var(--brand-orange);
  font-weight: 600;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--brand-orange);
  border-radius: 1px;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-tertiary);
  font-family: "Outfit", sans-serif;
}

.lang-option {
  padding: 4px 10px;
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.lang-option.active {
  background: var(--brand-orange);
  color: white;
  font-weight: 600;
}

.nav-cta {
  padding: 9px 22px;
  background: var(--brand-orange);
  color: white;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  transition: all 0.25s ease;
}

.nav-cta:hover {
  background: #E85F00;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(255, 106, 0, 0.3);
}

.mobile-menu-btn {
  display: none;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}

.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: all 0.3s ease;
}

/* ========== Hero 首屏 ========== */
.hero {
  height: 100vh;
  min-height: 640px;
  padding-top: var(--nav-height);
  position: relative;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg-full {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 0;
}

.hero-bg-full-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-bg-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-bg-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.85) 0%,
    rgba(255, 255, 255, 0.72) 40%,
    rgba(255, 244, 236, 0.55) 100%
  );
}

.hero-content-full {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 48px;
  width: 100%;
  max-width: 780px;
  margin-left: 0;
  margin-right: auto;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--brand-orange);
  margin-bottom: 32px;
  font-family: "Outfit", sans-serif;
  text-transform: uppercase;
}

.hero-eyebrow::before {
  content: "";
  width: 32px;
  height: 1px;
  background: var(--brand-orange);
}

.hero-eyebrow-light {
  color: var(--brand-orange);
}

.hero-eyebrow-light::before {
  background: var(--brand-orange);
}

.hero-title {
  font-size: 72px;
  font-weight: 900;
  line-height: 1.1;
  color: var(--text-primary);
  margin-bottom: 28px;
  letter-spacing: -1px;
}

.hero-title .highlight {
  color: var(--brand-orange);
  position: relative;
}

.hero-title-light {
  color: #1a1a1a;
  text-shadow: 0 2px 20px rgba(255, 255, 255, 0.3);
}

.hero-subtitle {
  font-size: 22px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

.hero-subtitle-light {
  color: #2a2a2a;
  font-weight: 600;
}

.hero-subtitle-en {
  font-size: 16px;
  font-style: italic;
  color: var(--text-tertiary);
  margin-bottom: 32px;
  font-family: "Outfit", sans-serif;
  font-weight: 400;
  letter-spacing: 0.5px;
}

.hero-subtitle-en-light {
  color: #555;
}

.hero-tagline {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 48px;
  max-width: 560px;
  line-height: 1.8;
}

.hero-tagline-light {
  color: #444;
  font-weight: 400;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 80px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 36px;
  background: var(--brand-orange);
  color: white;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  transition: all 0.3s ease;
  letter-spacing: 0.5px;
}

.btn-primary:hover {
  background: #E85F00;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 106, 0, 0.3);
}

.btn-primary .arrow {
  transition: transform 0.3s ease;
}

.btn-primary:hover .arrow {
  transform: translateX(4px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 28px;
  border: 1.5px solid var(--border-medium);
  color: var(--text-primary);
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  transition: all 0.25s ease;
}

.btn-secondary:hover {
  border-color: var(--brand-orange);
  color: var(--brand-orange);
}

.hero-stats {
  display: flex;
  gap: 60px;
}

.hero-stat-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.hero-stat-num {
  font-size: 36px;
  font-weight: 800;
  color: var(--text-primary);
  font-family: "Outfit", sans-serif;
  line-height: 1;
}

.hero-stat-num .unit {
  font-size: 20px;
  color: var(--brand-orange);
  font-weight: 700;
}

.hero-stat-label {
  font-size: 13px;
  color: var(--text-tertiary);
  letter-spacing: 0.5px;
}

.hero-stat-num-light {
  color: #1a1a1a;
}

.hero-stat-label-light {
  color: #555;
  font-weight: 500;
}

.btn-secondary-light {
  border-color: rgba(0, 0, 0, 0.25);
  color: #2a2a2a;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(8px);
}

.btn-secondary-light:hover {
  border-color: var(--brand-orange);
  color: var(--brand-orange);
  background: rgba(255, 255, 255, 0.9);
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--text-tertiary);
  letter-spacing: 2px;
  z-index: 2;
  animation: scrollBounce 2s infinite;
}

.hero-scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, transparent, var(--text-tertiary));
}

.hero-scroll-light {
  color: #666;
}

.hero-scroll-light .hero-scroll-line {
  background: linear-gradient(to bottom, transparent, #999);
}

@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: 1; }
  50% { transform: translateX(-50%) translateY(8px); opacity: 0.6; }
}

/* ========== 使命与痛点 ========== */
.problem-section {
  background: var(--bg-white);
}

.problem-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 80px;
}

.problem-stat-card {
  padding: 48px 40px;
  background: var(--bg-soft);
  border-radius: 16px;
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
}

.problem-stat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.problem-stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--brand-orange);
}

.problem-stat-number {
  font-size: 64px;
  font-weight: 900;
  color: var(--brand-orange);
  font-family: "Outfit", sans-serif;
  line-height: 1;
  margin-bottom: 16px;
}

.problem-stat-number .suffix {
  font-size: 32px;
  font-weight: 700;
  vertical-align: super;
}

.problem-stat-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.problem-stat-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.pain-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.pain-card {
  padding: 40px 32px;
  border: 1px solid var(--border-light);
  border-radius: 12px;
  transition: all 0.3s ease;
}

.pain-card:hover {
  border-color: var(--brand-orange);
  box-shadow: 0 8px 30px rgba(255, 106, 0, 0.08);
}

.pain-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 24px;
  color: var(--brand-orange);
}

.pain-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.pain-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ========== 市场机遇 ========== */
.opportunity-section {
  background: var(--bg-soft);
}

.opportunity-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.opp-card {
  padding: 56px 40px;
  background: white;
  border-radius: 16px;
  text-align: center;
  transition: all 0.35s ease;
  position: relative;
  overflow: hidden;
}

.opp-card::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 3px;
  background: var(--brand-orange);
  transition: width 0.35s ease;
  border-radius: 2px;
}

.opp-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.08);
}

.opp-card:hover::after {
  width: 60px;
}

.opp-icon-wrap {
  width: 72px;
  height: 72px;
  margin: 0 auto 28px;
  background: var(--brand-orange-soft);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand-orange);
}

.opp-card h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.opp-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ========== 商业模式：四轮驱动 ========== */
.business-section {
  background: var(--bg-white);
}

.business-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-bottom: 48px;
}

.biz-card {
  display: flex;
  gap: 28px;
  padding: 40px;
  background: white;
  border: 1px solid var(--border-light);
  border-radius: 16px;
  transition: all 0.35s ease;
}

.biz-card:hover {
  border-color: transparent;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.08);
  transform: translateY(-4px);
}

.biz-img-wrap {
  width: 160px;
  height: 160px;
  border-radius: 12px;
  overflow: hidden;
  flex-shrink: 0;
  background: var(--bg-soft);
}

.biz-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.biz-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.biz-tag {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--brand-orange);
  background: var(--brand-orange-soft);
  padding: 4px 12px;
  border-radius: 20px;
  display: inline-block;
  margin-bottom: 14px;
  font-family: "Outfit", sans-serif;
  text-transform: uppercase;
  width: fit-content;
}

.biz-content h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.biz-content p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

.biz-learn {
  font-size: 13px;
  font-weight: 600;
  color: var(--brand-orange);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.2s ease;
  cursor: pointer;
  font-family: "Outfit", sans-serif;
  letter-spacing: 0.5px;
}

.biz-learn:hover {
  gap: 10px;
}

.biz-bottom {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  padding-top: 40px;
  border-top: 1px dashed var(--border-light);
}

.biz-bottom-arrow {
  color: var(--brand-orange);
  font-size: 24px;
  font-weight: 300;
}

.biz-bottom-text {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 1px;
}

.biz-bottom-text .orange {
  color: var(--brand-orange);
}

/* ========== 核心能力：企业四要素 ========== */
.core-section {
  background: var(--bg-soft);
  position: relative;
  overflow: hidden;
}

.core-section::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--brand-orange-light) 0%, transparent 60%);
  opacity: 0.4;
  pointer-events: none;
}

.core-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 60px 0;
}

.gem-container {
  position: relative;
  width: 700px;
  max-width: 100%;
}

.gem-image {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 20px 60px rgba(255, 106, 0, 0.1));
}

.core-four {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 80px;
  position: relative;
  z-index: 1;
}

.core-item {
  text-align: center;
  padding: 36px 24px;
  background: white;
  border-radius: 16px;
  transition: all 0.3s ease;
  border: 1px solid var(--border-light);
}

.core-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
  border-color: transparent;
}

.core-item-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  background: var(--brand-orange-soft);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--brand-orange);
}

.core-item h4 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.core-item p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ========== 应用场景 ========== */
.scenarios-section {
  background: var(--bg-white);
}

.scenario-tabs {
  display: flex;
  gap: 12px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.scenario-tab {
  padding: 10px 28px;
  border: 1.5px solid var(--border-medium);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.25s ease;
  cursor: pointer;
  background: white;
}

.scenario-tab:hover {
  border-color: var(--brand-orange);
  color: var(--brand-orange);
}

.scenario-tab.active {
  background: var(--brand-orange);
  border-color: var(--brand-orange);
  color: white;
  font-weight: 600;
}

.scenario-content {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 64px;
  align-items: center;
}

.scenario-image {
  border-radius: 16px;
  overflow: hidden;
  height: 420px;
}

.scenario-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.scenario-text h3 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.scenario-text p {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.9;
  margin-bottom: 28px;
}

.scenario-features {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.scenario-feature {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.scenario-feature-icon {
  width: 24px;
  height: 24px;
  color: var(--brand-orange);
  flex-shrink: 0;
  margin-top: 2px;
}

.scenario-feature span {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.6;
}

/* ========== 行业生态 ========== */
.ecosystem-section {
  background: var(--bg-soft);
  position: relative;
  overflow: hidden;
}

.hex-grid {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin: 60px 0;
}

.hex-row {
  display: flex;
  gap: 12px;
}

.hex-row:nth-child(2) {
  margin-left: -90px;
}

.hex-row:nth-child(4) {
  margin-left: -90px;
}

.hex-item {
  width: 180px;
  height: 208px;
  position: relative;
  clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
  background: white;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  transition: all 0.35s ease;
  cursor: pointer;
  border: none;
}

.hex-item::before {
  content: "";
  position: absolute;
  inset: 2px;
  clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
  background: white;
  z-index: 1;
  transition: all 0.3s ease;
}

.hex-item::after {
  content: "";
  position: absolute;
  inset: 0;
  clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
  background: var(--border-medium);
  transition: all 0.3s ease;
}

.hex-item:hover::after {
  background: var(--brand-orange);
}

.hex-item:hover {
  transform: translateY(-6px);
}

.hex-item > * {
  position: relative;
  z-index: 2;
}

.hex-icon {
  width: 40px;
  height: 40px;
  color: var(--brand-orange);
}

.hex-text {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  text-align: center;
  padding: 0 16px;
  line-height: 1.4;
}

.hex-sub {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: -6px;
}

/* ========== ESG 价值衡量 ========== */
.esg-section {
  background: var(--bg-white);
  position: relative;
  overflow: hidden;
}

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

.esg-disclaimer {
  text-align: right;
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: 8px;
  letter-spacing: 0.3px;
}

.esg-card {
  padding: 44px 32px;
  border-radius: 16px;
  background: white;
  border: 1px solid var(--border-light);
  transition: all 0.35s ease;
  position: relative;
  overflow: hidden;
}

.esg-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.08);
  border-color: transparent;
}

.esg-card .esg-icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.esg-card.economic .esg-icon-wrap { background: #FFF4EC; color: var(--brand-orange); }
.esg-card.social .esg-icon-wrap { background: #E8F5E9; color: #2E7D32; }
.esg-card.ecological .esg-icon-wrap { background: #E3F2FD; color: #1565C0; }
.esg-card.cultural .esg-icon-wrap { background: #F3E5F5; color: #7B1FA2; }

.esg-card h4 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.esg-metrics {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.esg-metric {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--border-light);
}

.esg-metric:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.esg-metric-label {
  font-size: 13px;
  color: var(--text-secondary);
}

.esg-metric-value {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  font-family: "Outfit", sans-serif;
}

.esg-cultural-visual {
  display: flex;
  align-items: center;
  gap: 48px;
  padding: 48px;
  background: var(--bg-soft);
  border-radius: 20px;
  margin-top: 40px;
}

.esg-cultural-text {
  flex: 1;
}

.esg-cultural-text h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.esg-cultural-text p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.9;
}

.shanhai-beast {
  width: 200px;
  height: 200px;
  flex-shrink: 0;
  opacity: 0.8;
}

/* ========== 利益相关方 ========== */
.stakeholders-section {
  background: var(--bg-soft);
}

.stakeholders-circle {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
  margin: 60px 0 40px;
}

.stakeholder-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  transition: all 0.3s ease;
}

.stakeholder-node:hover {
  transform: translateY(-6px);
}

.stakeholder-circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: white;
  border: 2px solid var(--border-light);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

.stakeholder-node:hover .stakeholder-circle {
  border-color: var(--brand-orange);
  box-shadow: 0 8px 30px rgba(255, 106, 0, 0.15);
}

.stakeholder-icon {
  width: 36px;
  height: 36px;
  color: var(--brand-orange);
}

.stakeholder-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.stakeholder-plus {
  font-size: 24px;
  color: var(--border-medium);
  font-weight: 300;
}

.stakeholders-footer {
  text-align: center;
  padding-top: 32px;
  border-top: 1px dashed var(--border-light);
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.stakeholders-footer strong {
  color: var(--brand-orange);
  font-weight: 700;
}

/* ========== 加入我们 ========== */
.join-section {
  background: var(--bg-white);
  position: relative;
  overflow: hidden;
}

.join-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.join-text h2 {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.join-text h2 .orange {
  color: var(--brand-orange);
}

.join-text .join-tagline {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 36px;
  line-height: 1.9;
}

.join-story {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.9;
  margin-bottom: 40px;
  padding-left: 20px;
  border-left: 3px solid var(--brand-orange);
}

.join-contact {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 36px;
}

.join-contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  color: var(--text-secondary);
}

.join-contact-icon {
  width: 20px;
  height: 20px;
  color: var(--brand-orange);
  flex-shrink: 0;
}

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

.join-visual {
  position: relative;
  height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.join-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 20px;
}

/* ========== 页脚 ========== */
.footer {
  background: #1A1A1A;
  color: rgba(255, 255, 255, 0.7);
  padding: 80px 0 40px;
}

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

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

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

.footer-logo-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  background: white;
  border-radius: 12px;
  padding: 10px 16px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.footer-logo-img {
  height: 32px;
  width: auto;
  display: block;
}

.footer-logo-icon {
  width: 44px;
  height: 44px;
}

.footer-logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.footer-logo-cn {
  font-size: 18px;
  font-weight: 700;
  color: white;
  letter-spacing: 2px;
}

.footer-logo-en {
  font-size: 10px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 1.5px;
  font-family: "Outfit", sans-serif;
  text-transform: uppercase;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.8;
  max-width: 360px;
  color: rgba(255, 255, 255, 0.5);
}

.footer-col h5 {
  font-size: 14px;
  font-weight: 600;
  color: white;
  margin-bottom: 24px;
  letter-spacing: 0.5px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-col li a {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  transition: color 0.2s ease;
}

.footer-col li a:hover {
  color: var(--brand-orange);
}

.footer-bottom {
  padding-top: 32px;
  display: flex;
  align-items: center;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
}

/* ========== 滚动渐入动画 ========== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .container { padding: 0 32px; }
  .nav-container { padding: 0 32px; }
  .hero-content { padding: 0 32px; }
  .hero-content-full { padding: 0 32px; max-width: 600px; }
  .section { padding: 96px 0; }
  .section-title { font-size: 36px; }
  .hero-title { font-size: 56px; }
  .problem-stats, .pain-points, .opportunity-grid { grid-template-columns: repeat(2, 1fr); }
  .business-grid { grid-template-columns: 1fr; }
  .core-four { grid-template-columns: repeat(2, 1fr); }
  .esg-grid { grid-template-columns: repeat(2, 1fr); }
  .scenario-content { grid-template-columns: 1fr; }
  .join-inner { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 40px; }
  .hex-row:nth-child(2), .hex-row:nth-child(4) { margin-left: 0; }
  .hex-grid { gap: 8px; }
  .hex-item { width: 140px; height: 162px; }
}

@media (max-width: 768px) {
  .container { padding: 0 24px; }
  .nav-container { padding: 0 24px; }
  .hero-content { padding: 0 24px; }
  .hero-content-full { padding: 0 24px; }
  .section { padding: 72px 0; }
  .section-title { font-size: 28px; }
  .hero-title { font-size: 40px; }
  .hero-subtitle { font-size: 18px; }
  .hero-tagline { font-size: 15px; margin-bottom: 32px; }
  .hero-cta-group { margin-bottom: 48px; flex-wrap: wrap; }
  .nav-links, .nav-cta { display: none; }
  .mobile-menu-btn { display: flex; }
  .problem-stats, .pain-points, .opportunity-grid { grid-template-columns: 1fr; }
  .biz-card { flex-direction: column; }
  .biz-img-wrap { width: 100%; height: 200px; }
  .core-four { grid-template-columns: 1fr; }
  .esg-grid { grid-template-columns: 1fr; }
  .esg-cultural-visual { flex-direction: column-reverse; gap: 32px; padding: 32px; }
  .stakeholders-circle { gap: 20px; }
  .stakeholder-circle { width: 90px; height: 90px; }
  .nav-logo-img { height: 28px; }
  .footer-logo-img { height: 28px; }
  .footer-logo-badge { padding: 8px 14px; border-radius: 10px; }
  .join-text h2 { font-size: 32px; }
  .hero-stats { gap: 32px; flex-wrap: wrap; }
  .hero-stat-num { font-size: 28px; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
  .section-header { margin-bottom: 48px; }
  .hex-item { width: 120px; height: 138px; }
  .hex-text { font-size: 12px; padding: 0 12px; }
  .modal-card {
    width: calc(100% - 48px);
    max-width: 360px;
    padding: 32px 24px 28px;
  }
  .modal-qr-img { width: 220px; height: 220px; }
  .modal-title { font-size: 20px; }
}

/* ========== 二维码弹窗 ========== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  animation: modalFadeIn 0.25s ease;
}

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

.modal-card {
  position: relative;
  background: white;
  border-radius: 20px;
  padding: 40px 36px 32px;
  width: 100%;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.2);
  animation: modalSlideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: #999;
  cursor: pointer;
  border-radius: 50%;
  transition: all 0.2s ease;
}

.modal-close:hover {
  background: #f5f5f5;
  color: #333;
}

.modal-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 24px;
  letter-spacing: 0.5px;
}

.modal-qr-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 20px;
}

.modal-qr-img {
  width: 240px;
  height: 240px;
  border-radius: 12px;
  object-fit: cover;
  border: 4px solid var(--brand-orange);
  padding: 4px;
  background: white;
}

.modal-tip {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0;
  letter-spacing: 0.3px;
}