/* ============================================================
   国汇融合国际贸易 - 企业官网样式
   主色调：蓝色(#1A56DB) 辅助：灰色(#374151)
   ============================================================ */

/* ---------- 语言切换按钮 ---------- */
.lang-toggle {
  background: #1A56DB;
  border: 1.5px solid #1A56DB;
  color: #fff;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.lang-toggle:hover {
  background: #1342b8;
  border-color: #1342b8;
}

.navbar.scrolled .lang-toggle {
  background: #1A56DB;
  border-color: #1A56DB;
  color: #fff;
}

.navbar.scrolled .lang-toggle:hover {
  background: #1342b8;
  border-color: #1342b8;
}

/* ---------- 基础重置与变量 ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --blue-900: #1e3a8a;
  --blue-800: #1e40af;
  --blue-700: #1d4ed8;
  --blue-600: #2563eb;
  --blue-500: #3b82f6;
  --blue-400: #60a5fa;
  --blue-300: #93c5fd;
  --blue-100: #dbeafe;
  --blue-50:  #eff6ff;

  --gray-900: #111827;
  --gray-800: #1f2937;
  --gray-700: #374151;
  --gray-600: #4b5563;
  --gray-500: #6b7280;
  --gray-400: #9ca3af;
  --gray-300: #d1d5db;
  --gray-200: #e5e7eb;
  --gray-100: #f3f4f6;
  --gray-50:  #f9fafb;

  --green-600: #059669;
  --green-500: #10b981;
  --green-100: #d1fae5;

  --primary: #1A56DB;
  --primary-dark: #1e40af;
  --text-dark: #111827;
  --text-body: #374151;
  --text-muted: #6b7280;
  --border: #e5e7eb;

  --font: 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 4px 16px rgba(0,0,0,0.10), 0 1px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.12), 0 4px 16px rgba(0,0,0,0.08);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15), 0 8px 24px rgba(0,0,0,0.10);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  font-size: 23px;
}

body {
  font-family: var(--font);
  color: var(--text-body);
  background: #ffffff;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

button {
  cursor: pointer;
  border: none;
  outline: none;
  font-family: var(--font);
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- 滚动条 ---------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--gray-100); }
::-webkit-scrollbar-thumb { background: var(--blue-400); border-radius: 3px; }

/* ============================================================
   导航栏
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

.navbar.scrolled {
  border-bottom-color: var(--border);
  box-shadow: var(--shadow);
  background: rgba(255,255,255,0.98);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 32px;
  height: 90px;
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-logo-img {
  height: 56px;
  width: auto;
  display: block;
  object-fit: contain;
  flex-shrink: 0;
}

.nav-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}



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

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

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-main {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--blue-800);
  letter-spacing: 0.05em;
}

.logo-main.light {
  color: #fff;
}

.logo-sub {
  font-size: 0.62rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.12em;
}

.logo-sub.light {
  color: var(--blue-300);
}

.nav-links {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.nav-link {
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  white-space: nowrap;
  font-weight: 500;
  color: var(--text-body);
  transition: var(--transition);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background: var(--blue-50);
}

.nav-cta {
  background: var(--primary);
  color: #fff;
  padding: 8px 22px;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
  transition: var(--transition);
  flex-shrink: 0;
  white-space: nowrap;
}

.nav-cta:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(26,86,219,0.35);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  padding: 4px;
  margin-left: auto;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: var(--transition);
}

.mobile-menu {
  display: none;
  flex-direction: column;
  background: #fff;
  border-top: 1px solid var(--border);
  padding: 12px 24px 20px;
  gap: 2px;
}

.mobile-menu.open {
  display: flex;
}

.mobile-link {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  color: var(--text-body);
  transition: var(--transition);
}

.mobile-link:hover {
  background: var(--blue-50);
  color: var(--primary);
}

.mobile-menu-footer {
  padding: 12px 16px 4px;
  border-top: 1px solid var(--border);
  margin-top: 8px;
}

.mobile-cta {
  width: 100%;
  text-align: center;
  border-radius: 8px;
  padding: 12px 0;
  font-size: 0.88rem;
}



/* ============================================================
   Hero 首页
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

/* 底层：北京标志建筑实景图 */
.hero-bg {
  position: absolute;
  inset: 0;
  background: #0a1628;
}

.hero-city-img {
  position: absolute;
  inset: 0;
  background-image: url('https://images.unsplash.com/photo-1508804185872-d7badad00f7d?w=1800&q=85&auto=format&fit=crop');
  background-size: cover;
  background-position: center 40%;
  background-repeat: no-repeat;
  transform-origin: center;
  animation: heroZoom 20s ease-in-out infinite alternate;
}

@keyframes heroZoom {
  0%   { transform: scale(1.0) translateY(0); }
  100% { transform: scale(1.06) translateY(-10px); }
}

/* 蓝色透明滤镜：叠在实景图上，营造企业专业感 */
.hero-blue-filter {
  position: absolute;
  inset: 0;
  background: rgba(10, 30, 80, 0.62);
  /* 蓝色调色混合，加强蓝色渲染 */
  mix-blend-mode: multiply;
}

/* 深度渐变遮罩：底部加深保证文字可读，左侧轻微光晕 */
.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      to bottom,
      rgba(5, 15, 50, 0.20) 0%,
      rgba(5, 15, 50, 0.10) 40%,
      rgba(5, 15, 50, 0.50) 80%,
      rgba(5, 15, 50, 0.72) 100%
    ),
    radial-gradient(ellipse at 18% 55%, rgba(37, 99, 235, 0.22) 0%, transparent 55%),
    radial-gradient(ellipse at 85% 20%, rgba(96, 165, 250, 0.10) 0%, transparent 45%);
}

#particleCanvas {
  position: absolute;
  inset: 0;
  opacity: 0.5;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 120px 24px 80px;
  width: 100%;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  backdrop-filter: blur(8px);
  color: #93c5fd;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  margin-bottom: 28px;
  animation: fadeInDown 0.8s ease both;
}

.badge-dot {
  width: 7px;
  height: 7px;
  background: #4ade80;
  border-radius: 50%;
  animation: pulse 2s ease infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.3); }
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 700;
  color: #ffffff;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  animation: fadeInUp 0.9s ease 0.1s both;
}

.title-highlight {
  background: linear-gradient(90deg, #60a5fa, #93c5fd, #60a5fa);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: shimmer 3s linear infinite, fadeInUp 0.9s ease 0.1s both;
}

@keyframes shimmer {
  0% { background-position: 0% center; }
  100% { background-position: 200% center; }
}

.hero-desc {
  max-width: 640px;
  font-size: 1.05rem;
  color: #cbd5e1;
  line-height: 1.8;
  margin-bottom: 40px;
  animation: fadeInUp 0.9s ease 0.2s both;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 60px;
  animation: fadeInUp 0.9s ease 0.3s both;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(26,86,219,0.4);
}

.btn-primary:hover {
  background: var(--blue-600);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(26,86,219,0.5);
}

.btn-outline {
  background: transparent;
  color: #fff;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  border: 1.5px solid rgba(255,255,255,0.4);
  transition: var(--transition);
}

.btn-outline:hover {
  border-color: rgba(255,255,255,0.8);
  background: rgba(255,255,255,0.08);
  transform: translateY(-2px);
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
  animation: fadeInUp 0.9s ease 0.4s both;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.stat-num {
  font-size: 1.8rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1;
}

.stat-label {
  font-size: 0.78rem;
  color: #94a3b8;
  letter-spacing: 0.06em;
}

.stat-divider {
  width: 1px;
  height: 36px;
  background: rgba(255,255,255,0.2);
}

.hero-scroll-hint {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: #94a3b8;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  animation: bounce 2s ease infinite;
  cursor: pointer;
}

.scroll-arrow {
  width: 20px;
  height: 20px;
  border-right: 2px solid #64748b;
  border-bottom: 2px solid #64748b;
  transform: rotate(45deg) translateY(-4px);
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================================
   业务概览卡片
   ============================================================ */
.overview {
  padding: 128px 0;
  background: var(--gray-50);
}

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

.overview-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.overview-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
}

.overview-card.energy::before { background: linear-gradient(90deg, #1A56DB, #3b82f6); }
.overview-card.mineral::before { background: linear-gradient(90deg, #374151, #6b7280); }
.overview-card.agri::before { background: linear-gradient(90deg, #059669, #10b981); }

.overview-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.overview-icon {
  width: 64px;
  height: 64px;
}

.overview-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-dark);
}

.overview-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.overview-arrow {
  font-size: 1.2rem;
  color: var(--primary);
  font-weight: 700;
  transition: var(--transition);
  align-self: flex-end;
  margin-top: auto;
}

.overview-card:hover .overview-arrow {
  transform: translateX(6px);
}

/* ============================================================
   通用 Section Header
   ============================================================ */
.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  background: var(--blue-50);
  color: var(--primary);
  padding: 5px 16px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 16px;
  border: 1px solid var(--blue-100);
}

.light-tag {
  background: rgba(255,255,255,0.15);
  color: #93c5fd;
  border-color: rgba(255,255,255,0.2);
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.6rem);
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.light-title { color: #ffffff; }

.section-desc {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

.light-desc { color: #94a3b8; }

.section-desc-dark {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================================
   关于我们
   ============================================================ */
.about {
  padding: 160px 0;
  background: #fff;
}

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

.about-visual {
  position: relative;
}

.about-img-main {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.about-img-main img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  object-position: center top;
  transition: transform 0.5s ease;
  display: block;
}

.about-img-main:hover img {
  transform: scale(1.03);
}

.about-img-badge {
  position: absolute;
  bottom: 24px;
  right: -20px;
  background: var(--primary);
  color: #fff;
  padding: 16px 22px;
  border-radius: var(--radius);
  text-align: center;
  box-shadow: var(--shadow-lg);
  z-index: 2;
}

.about-img-badge strong {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
}

.about-img-badge span {
  font-size: 0.78rem;
  opacity: 0.85;
}

/* 主图底部说明标签 */
.about-img-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 10px 16px;
  background: linear-gradient(to top, rgba(15,23,42,0.75), transparent);
  color: rgba(255,255,255,0.85);
  font-size: 0.78rem;
  display: flex;
  align-items: center;
  gap: 6px;
  letter-spacing: 0.04em;
}

.about-img-label svg {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
  opacity: 0.8;
}

.about-img-side {
  margin-top: 16px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  position: relative;
}

.about-img-side img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  object-position: center center;
  transition: transform 0.5s ease;
  display: block;
}

.about-img-side:hover img {
  transform: scale(1.03);
}

/* 侧图说明标签 */
.about-img-side-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 9px 14px;
  background: linear-gradient(to top, rgba(15,23,42,0.80), transparent);
  color: rgba(255,255,255,0.85);
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  gap: 6px;
  letter-spacing: 0.04em;
}

.about-img-side-label svg {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
  opacity: 0.75;
}


.about-intro h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 4px;
}

.about-en {
  font-size: 0.82rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  margin-bottom: 20px;
}

.about-text {
  color: var(--text-body);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

.about-values {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 28px;
}

.value-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 16px;
  background: var(--gray-50);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.value-item:hover {
  border-color: var(--blue-300);
  background: var(--blue-50);
}

.value-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.value-item div {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.value-item strong {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-dark);
}

.value-item span {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ============================================================
   核心业务
   ============================================================ */
.business {
  padding: 160px 0;
  background: var(--gray-900);
}

.business .section-title { color: #fff; }
.business .section-tag {
  background: rgba(26,86,219,0.3);
  color: var(--blue-300);
  border-color: rgba(26,86,219,0.4);
}

/* 业务标签 */
.biz-tabs {
  display: flex;
  gap: 12px;
  margin-bottom: 48px;
  justify-content: center;
  flex-wrap: wrap;
}

.biz-tab {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.07);
  color: #94a3b8;
  padding: 12px 28px;
  border-radius: 40px;
  font-size: 0.95rem;
  font-weight: 600;
  border: 1.5px solid transparent;
  transition: var(--transition);
  cursor: pointer;
}

.biz-tab svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.biz-tab:hover {
  color: #fff;
  background: rgba(255,255,255,0.12);
}

.biz-tab.active {
  color: #fff;
  background: var(--primary);
  border-color: var(--blue-500);
  box-shadow: 0 4px 16px rgba(26,86,219,0.4);
}

/* 业务面板 */
.biz-panel {
  display: none;
  animation: fadeInUp 0.5s ease;
}

.biz-panel.active { display: block; }

.biz-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.biz-layout.reverse {
  direction: rtl;
}

.biz-layout.reverse > * {
  direction: ltr;
}

/* 产品图片区 */
.biz-img-primary {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.biz-img-primary img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.biz-img-primary:hover img {
  transform: scale(1.04);
}

.biz-img-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 20px 24px;
  background: linear-gradient(to top, rgba(26,86,219,0.85), transparent);
  color: #fff;
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.mineral-overlay {
  background: linear-gradient(to top, rgba(30,30,40,0.9), transparent);
}

.agri-overlay {
  background: linear-gradient(to top, rgba(5,100,69,0.85), transparent);
}

.biz-img-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 12px;
}

.biz-img-grid img {
  width: 100%;
  height: 150px;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 0.4s ease;
}

.biz-img-grid img:hover {
  transform: scale(1.03);
}

/* 业务信息区 */
.biz-info {
  padding: 8px 0;
}

.biz-category-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: 20px;
}

.biz-category-badge svg {
  width: 14px;
  height: 14px;
}

.energy-theme .biz-category-badge {
  background: rgba(26,86,219,0.2);
  color: var(--blue-300);
  border: 1px solid rgba(26,86,219,0.3);
}

.mineral-badge {
  background: rgba(107,114,128,0.2);
  color: #9ca3af;
  border: 1px solid rgba(107,114,128,0.3);
}

.agri-badge {
  background: rgba(5,150,105,0.2);
  color: #34d399;
  border: 1px solid rgba(5,150,105,0.3);
}

.biz-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.3;
  margin-bottom: 16px;
}

.biz-desc {
  color: #94a3b8;
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 28px;
}

.product-section,
.supplier-section {
  margin-bottom: 24px;
}

.product-section h4,
.supplier-section h4 {
  font-size: 0.82rem;
  font-weight: 600;
  color: #64748b;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

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

.ptag {
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 500;
}

.ptag.energy {
  background: rgba(26,86,219,0.15);
  color: var(--blue-300);
  border: 1px solid rgba(26,86,219,0.25);
}

.ptag.mineral {
  background: rgba(107,114,128,0.15);
  color: #9ca3af;
  border: 1px solid rgba(107,114,128,0.25);
}

.ptag.agri {
  background: rgba(5,150,105,0.15);
  color: #34d399;
  border: 1px solid rgba(5,150,105,0.25);
}

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

.supplier-item {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #cbd5e1;
  font-size: 0.9rem;
}

.supplier-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.supplier-dot.energy { background: var(--blue-400); }
.supplier-dot.mineral { background: #9ca3af; }
.supplier-dot.agri { background: #34d399; }

/* ============================================================
   核心竞争力
   ============================================================ */
.strength {
  position: relative;
  padding: 160px 0;
  overflow: hidden;
}

.strength-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, #0f172a 0%, #1e3a8a 50%, #111827 100%);
}

.strength-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 0% 50%, rgba(26,86,219,0.2) 0%, transparent 60%),
    radial-gradient(ellipse at 100% 0%, rgba(96,165,250,0.1) 0%, transparent 40%);
}

.strength > .container {
  position: relative;
  z-index: 2;
}

.strength-grid {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.strength-card {
  display: grid;
  grid-template-columns: 100px 1fr 320px;
  gap: 40px;
  align-items: center;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  padding: 40px;
  transition: var(--transition);
  backdrop-filter: blur(8px);
}

.strength-card:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(96,165,250,0.3);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.strength-card.reverse {
  direction: rtl;
}

.strength-card.reverse > * {
  direction: ltr;
}

.strength-icon-wrap {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.s1 { background: rgba(26,86,219,0.15); border: 1px solid rgba(26,86,219,0.3); }
.s2 { background: rgba(55,65,81,0.3); border: 1px solid rgba(107,114,128,0.3); }
.s3 { background: rgba(26,86,219,0.1); border: 1px solid rgba(26,86,219,0.2); }

.strength-icon {
  width: 60px;
  height: 60px;
}

.strength-content h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.strength-content p {
  color: #94a3b8;
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 20px;
}

.strength-points {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.strength-points li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: #cbd5e1;
}

.strength-points li::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--blue-400);
  border-radius: 50%;
  flex-shrink: 0;
}

.strength-img {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.strength-img img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.strength-card:hover .strength-img img {
  transform: scale(1.05);
}

/* ============================================================
   服务流程
   ============================================================ */
.process {
  padding: 160px 0;
  background: var(--gray-50);
}

.process-steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
  margin-top: 20px;
}

.process-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 32px 24px;
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  width: 170px;
  text-align: center;
  transition: var(--transition);
  position: relative;
}

.process-step:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--blue-300);
}

.step-number {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: #fff;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  font-size: 0.72rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-icon {
  width: 48px;
  height: 48px;
}

.process-step h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-dark);
}

.process-step p {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.process-arrow {
  font-size: 1.5rem;
  color: var(--blue-300);
  padding: 0 8px;
  font-weight: 300;
}

/* ============================================================
   联系我们
   ============================================================ */
.contact {
  padding: 160px 0;
  background: #fff;
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr;
  justify-content: center;
}

.contact-info {
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

/* 联系信息卡 */
.contact-info {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
}

.contact-info-header {
  position: relative;
  height: 200px;
  overflow: hidden;
}

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

.contact-info-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(17,24,39,0.92), rgba(30,58,138,0.6));
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 24px;
}

.contact-info-overlay h3 {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}

.contact-info-overlay p {
  font-size: 0.72rem;
  color: #93c5fd;
  letter-spacing: 0.05em;
}

.contact-details {
  padding: 24px;
  background: #fff;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-detail-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.contact-detail-icon {
  width: 32px;
  height: 32px;
  background: var(--blue-50);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-detail-icon svg {
  width: 18px;
  height: 18px;
}

.contact-detail-item strong {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dark);
}

.contact-detail-item span {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.contact-response-tip {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--green-100);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-top: 8px;
}

.contact-response-tip svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.contact-response-tip strong {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--green-600);
}



/* ============================================================
   页脚
   ============================================================ */
.footer-main {
  background: var(--gray-900);
  padding: 72px 0 48px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr 1fr;
  gap: 48px;
}

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

.footer-brand-desc {
  font-size: 0.875rem;
  color: #6b7280;
  line-height: 1.7;
  margin-bottom: 16px;
}

.footer-cert {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  color: #4b5563;
  background: rgba(255,255,255,0.05);
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid rgba(255,255,255,0.08);
}

.footer-nav h4,
.footer-biz h4,
.footer-contact h4 {
  font-size: 0.82rem;
  font-weight: 600;
  color: #9ca3af;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.footer-nav a,
.footer-biz a {
  display: block;
  font-size: 0.875rem;
  color: #6b7280;
  padding: 5px 0;
  transition: color 0.2s;
}

.footer-nav a:hover,
.footer-biz a:hover {
  color: var(--blue-400);
}

.footer-contact-list p {
  font-size: 0.78rem;
  color: #9ca3af;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.footer-contact-list a {
  color: #9ca3af;
  text-decoration: none;
}

.footer-contact-list a:hover {
  color: #60a5fa;
}



.footer-bottom {
  background: #0a0f1a;
  padding: 20px 0;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: #374151;
  line-height: 1.8;
}

/* ============================================================
   回到顶部
   ============================================================ */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(26,86,219,0.4);
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 500;
}

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

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(26,86,219,0.5);
}

.back-to-top svg {
  width: 22px;
  height: 22px;
}

/* ============================================================
   Scroll 动画
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* ============================================================
   响应式设计
   ============================================================ */
@media (max-width: 1024px) {
  .strength-card {
    grid-template-columns: 80px 1fr;
  }

  .strength-img {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .footer-nav {
    grid-column: 1 / 2;
  }

  .footer-biz {
    grid-column: 2 / 3;
  }

  .footer-contact {
    grid-column: 1 / 3;
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-cta {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  /* 导航栏高度压缩 */
  .nav-container {
    height: 64px;
    padding: 0 16px;
    gap: 12px;
  }

  /* Logo缩小 */
  .nav-logo-img {
    height: 40px;
  }

  /* lang-toggle 在移动端保留，尺寸略小 */
  .lang-toggle {
    font-size: 0.7rem;
    padding: 3px 8px;
    margin-left: auto;
  }

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

  .overview-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .about-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-img-badge {
    right: 16px;
  }

  .biz-layout {
    grid-template-columns: 1fr;
    direction: ltr !important;
  }

  .biz-layout.reverse {
    direction: ltr;
  }

  .strength-card {
    grid-template-columns: 1fr;
    text-align: center;
    direction: ltr !important;
  }

  .strength-card.reverse {
    direction: ltr;
  }

  .strength-icon-wrap {
    margin: 0 auto;
  }

  .strength-points li {
    justify-content: center;
  }

  .process-steps {
    gap: 8px;
  }

  .process-arrow {
    transform: rotate(90deg);
    padding: 4px 0;
  }

  .process-step {
    width: 150px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-nav,
  .footer-biz,
  .footer-contact {
    grid-column: auto;
  }

  .hero-stats {
    gap: 20px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }

  /* Hero 内容区 */
  .hero-content {
    padding: 90px 20px 56px;
  }

  .hero-desc {
    font-size: 0.85rem;
  }

  .hero-badge {
    font-size: 0.72rem;
    padding: 5px 12px;
  }

  .stat-num  { font-size: 1.4rem; }
  .stat-label { font-size: 0.68rem; }
  .stat-divider { height: 24px; }

  /* 各 section 上下间距压缩 */
  .overview   { padding: 60px 0; }
  .about      { padding: 72px 0; }
  .business   { padding: 72px 0; }
  .strength   { padding: 72px 0; }
  .process    { padding: 72px 0; }
  .investment { padding: 72px 0; }
  .contact    { padding: 72px 0; }
  .footer-main { padding: 48px 0 32px; }

  /* section 标题间距 */
  .section-header { margin-bottom: 32px; }

  /* 关于我们图片高度 */
  .about-img-main img { height: 220px; }
  .about-img-side img { height: 150px; }

  /* 核心业务图片 */
  .biz-img-primary img { height: 200px; }

  /* 服务流程步骤卡片 */
  .process-step {
    width: 130px;
    padding: 24px 14px;
  }

  /* 供应链投资亮点条 */
  .inv-highlights { padding: 24px 16px; }

  /* 页脚联系信息移动端允许换行 */
  .footer-contact-list p {
    white-space: normal;
    flex-wrap: wrap;
  }

  .footer-contact-list a {
    white-space: normal;
  }
}

/* ============================================================
   供应链投资板块
   ============================================================ */
.investment {
  padding: 160px 0;
  background: #f8faff;
}

.investment .section-title { color: var(--text-dark); }
.investment .section-desc  { color: var(--text-muted); }

/* 四卡片网格 */
.inv-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 56px;
}

.inv-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.07);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
}

.inv-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 36px rgba(0,0,0,0.13);
}

/* 卡片顶图 */
.inv-card-img {
  position: relative;
  height: 180px;
  overflow: hidden;
}

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

.inv-card:hover .inv-card-img img {
  transform: scale(1.06);
}

.inv-card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 40%, rgba(10,20,50,0.55) 100%);
}

/* 卡片颜色主题（顶部色条） */
.inv-energy   { border-top: 3px solid #1A56DB; }
.inv-mineral  { border-top: 3px solid #6b7280; }
.inv-agri     { border-top: 3px solid #16a34a; }
.inv-logistics{ border-top: 3px solid #0891b2; }

/* 卡片内容区 */
.inv-card-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* 图标 */
.inv-icon {
  width: 44px;
  height: 44px;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.inv-energy   .inv-icon { color: #1A56DB; }
.inv-mineral  .inv-icon { color: #6b7280; }
.inv-agri     .inv-icon { color: #16a34a; }
.inv-logistics.inv-icon { color: #0891b2; }

.inv-icon svg { width: 38px; height: 38px; }

.inv-card-body h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 10px;
}

.inv-card-body p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 18px;
  flex: 1;
}

/* 标签列表 */
.inv-tags {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.inv-tags li {
  font-size: 0.72rem;
  padding: 4px 11px;
  border-radius: 20px;
  font-weight: 500;
  letter-spacing: 0.03em;
}

.inv-energy   .inv-tags li { background: #eff6ff; color: #1d4ed8; }
.inv-mineral  .inv-tags li { background: #f3f4f6; color: #374151; }
.inv-agri     .inv-tags li { background: #f0fdf4; color: #15803d; }
.inv-logistics.inv-tags li { background: #ecfeff; color: #0e7490; }

/* 底部亮点数据条 */
.inv-highlights {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-top: 60px;
  background: var(--blue-800);
  border-radius: var(--radius-lg);
  padding: 36px 48px;
}

.inv-highlight-item {
  flex: 1;
  text-align: center;
}

.inv-highlight-item strong {
  display: block;
  font-size: 1.8rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.1;
  margin-bottom: 6px;
}

.inv-highlight-item span {
  font-size: 0.78rem;
  color: #93c5fd;
  letter-spacing: 0.06em;
}

.inv-highlight-divider {
  width: 1px;
  height: 40px;
  background: rgba(255,255,255,0.2);
  flex-shrink: 0;
  margin: 0 8px;
}

/* 响应式 */
@media (max-width: 1200px) {
  .inv-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .inv-grid {
    grid-template-columns: 1fr;
  }
  .inv-highlights {
    flex-wrap: wrap;
    gap: 24px;
    padding: 28px 24px;
  }
  .inv-highlight-divider { display: none; }
  .inv-highlight-item { flex: 0 0 45%; }
}

/* ============================================================
   联系方式扩展样式
   ============================================================ */

.contact-phone-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.contact-phone-link {
  font-size: 0.875rem;
  color: var(--text-body);
  transition: color 0.2s;
  text-decoration: none;
}

.contact-phone-link:hover {
  color: var(--primary);
}

.contact-phone-link em {
  font-style: normal;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-left: 4px;
}

.contact-email-link {
  font-size: 0.875rem;
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s;
  word-break: break-all;
}

.contact-email-link:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

/* 页脚联系信息列表 */
.footer-contact-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.footer-contact-list p {
  display: flex;
  align-items: flex-start;
  gap: 7px;
  font-size: 0.82rem !important;
  color: #6b7280;
  line-height: 1.5;
  margin-bottom: 0 !important;
}

.footer-contact-list p svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  margin-top: 2px;
}

.footer-contact-list a {
  color: #9ca3af;
  text-decoration: none;
  transition: color 0.2s;
  white-space: nowrap;
}

.footer-contact-list a:hover {
  color: var(--blue-400);
}

.footer-phone-label {
  font-size: 0.75rem;
  color: #4b5563;
  flex-shrink: 0;
}

/* ============================================================
   响应式（追加）
   ============================================================ */
@media (max-width: 480px) {
  /* 全局字号在小屏适度降小 */
  html { font-size: 18px; }

  .container {
    padding: 0 14px;
  }

  .hero-content {
    padding: 80px 14px 48px;
  }

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

  .hero-actions {
    flex-direction: column;
  }

  .btn-primary, .btn-outline {
    text-align: center;
  }

  .biz-img-grid {
    grid-template-columns: 1fr;
  }

  .process-steps {
    flex-direction: column;
    align-items: center;
  }

  .process-arrow {
    transform: rotate(90deg);
  }

  /* 核心竞争力卡片内边距 */
  .strength-card { padding: 24px 20px; }

  /* 联系卡片标题字号 */
  .contact-info-overlay h3 { font-size: 0.88rem; }
}