/* ===========================================
   云明科技 - 全局样式 v3
   简洁大气 · 分类清晰 · 色彩分明
   =========================================== */

:root {
  /* 蓝 - 数字化基建 */
  --color-primary: #1e6fff;
  --color-primary-dark: #0f4fd1;
  --color-primary-light: #e8f1ff;

  /* 橙 - 增长与流量 */
  --color-accent: #ff8a3d;
  --color-accent-light: #fff0e5;

  /* 紫 - 政企 / 智慧社区 */
  --color-purple: #7c4dff;
  --color-purple-light: #f0e9ff;

  /* 绿 - 强调/小标 */
  --color-green: #00c2a8;
  --color-green-light: #e0faf5;

  /* 文字 */
  --color-text: #1a1f2e;
  --color-text-light: #5a6478;
  --color-text-mute: #8b94a7;

  /* 背景 */
  --color-bg: #ffffff;
  --color-bg-soft: #f6f8fb;
  --color-border: #e6ebf2;
  --color-border-light: #f0f3f8;

  --shadow-sm: 0 2px 8px rgba(20, 40, 80, 0.04);
  --shadow-md: 0 8px 28px rgba(20, 40, 80, 0.08);
  --shadow-lg: 0 16px 48px rgba(20, 40, 80, 0.12);

  --radius: 10px;
  --radius-lg: 16px;
  --max-width: 1200px;
  --transition: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover { color: var(--color-primary-dark); }
img { max-width: 100%; display: block; }

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

/* ============ 顶部导航 ============ */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 19px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.5px;
}

.logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-green) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 17px;
  font-weight: 800;
}

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

.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--color-text);
  font-size: 15px;
  font-weight: 500;
  padding: 10px 16px;
  border-radius: 6px;
  transition: all var(--transition);
  cursor: pointer;
}

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

.nav-link .arrow {
  font-size: 10px;
  transition: transform var(--transition);
}

.nav-item {
  position: relative;
}

.nav-item:hover .nav-link .arrow {
  transform: rotate(180deg);
}

.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  padding: 12px;
  min-width: 240px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown a {
  display: flex;
  flex-direction: column;
  padding: 10px 14px;
  border-radius: 8px;
  color: var(--color-text);
  transition: background var(--transition);
}

.nav-dropdown a:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.nav-dropdown a strong {
  font-size: 14px;
  font-weight: 600;
  display: block;
}

.nav-dropdown a span {
  font-size: 12px;
  color: var(--color-text-light);
  margin-top: 2px;
}

.nav-cta {
  background: var(--color-primary);
  color: #fff !important;
  padding: 10px 20px !important;
  border-radius: 6px;
  margin-left: 8px;
}

.nav-cta:hover {
  background: var(--color-primary-dark) !important;
  color: #fff !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(30, 111, 255, 0.25);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: var(--color-text);
}

/* ============ Hero ============ */
.hero {
  padding: 80px 0 64px;
  background:
    radial-gradient(ellipse 80% 60% at top right, rgba(30, 111, 255, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at bottom left, rgba(0, 194, 168, 0.06) 0%, transparent 60%),
    linear-gradient(180deg, #fafbfd 0%, #ffffff 100%);
  position: relative;
  overflow: hidden;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 20px;
}

.hero-tag-dot {
  width: 6px;
  height: 6px;
  background: var(--color-green);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: 52px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.2px;
  margin-bottom: 24px;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--color-primary), var(--color-green));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 18px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.hero-trust {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border-light);
  font-size: 13px;
  color: var(--color-text-light);
  flex-wrap: wrap;
}

.hero-trust strong { color: var(--color-text); font-weight: 700; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  font-size: 15px;
  font-weight: 500;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  font-family: inherit;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(30, 111, 255, 0.25);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(30, 111, 255, 0.35);
}

.btn-outline {
  background: #fff;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
}

.btn-large { padding: 16px 36px; font-size: 16px; }

.hero-visual {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.hv-card {
  background: #fff;
  border-radius: 14px;
  padding: 20px 22px;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 18px;
  transition: all var(--transition);
  border: 1px solid var(--color-border-light);
}

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

.hv-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: #fff;
}

.hv-card-icon svg { width: 24px; height: 24px; }

.bg-blue { background: linear-gradient(135deg, #1e6fff, #4d8cff); }
.bg-green { background: linear-gradient(135deg, #00c2a8, #2dd4bf); }
.bg-purple { background: linear-gradient(135deg, #7c4dff, #a78bfa); }
.bg-orange { background: linear-gradient(135deg, #ff8a3d, #ffb066); }

.hv-card-content h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
}

.hv-card-content p {
  font-size: 13px;
  color: var(--color-text-light);
}

/* ============ 业务总览条（3 类卡片） ============ */
.biz-overview {
  padding: 48px 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.biz-overview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.biz-overview-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 22px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 14px;
  text-decoration: none;
  color: var(--color-text);
  transition: all var(--transition);
  cursor: pointer;
}

.biz-overview-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.biz-overview-card.cat-blue:hover { border-color: var(--color-primary); }
.biz-overview-card.cat-purple:hover { border-color: var(--color-purple); }
.biz-overview-card.cat-orange:hover { border-color: var(--color-accent); }

.biz-overview-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  flex-shrink: 0;
}

.biz-overview-icon svg { width: 26px; height: 26px; }

.biz-overview-content { flex: 1; }

.biz-overview-content h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 2px;
}

.biz-overview-content p {
  font-size: 13px;
  color: var(--color-text-light);
}

.biz-overview-arrow {
  font-size: 18px;
  color: var(--color-text-mute);
  transition: transform var(--transition);
}

.biz-overview-card:hover .biz-overview-arrow {
  transform: translateX(4px);
  color: var(--color-primary);
}

/* ============ 业务分类区 v3 - 强分类视觉 ============ */
.biz-section {
  padding: 80px 0;
  position: relative;
}

.biz-section.cat-blue {
  background: linear-gradient(180deg, #f0f6ff 0%, #ffffff 100%);
}

.biz-section.cat-purple {
  background: linear-gradient(180deg, #f5f0ff 0%, #ffffff 100%);
}

.biz-section.cat-orange {
  background: linear-gradient(180deg, #fff5ec 0%, #ffffff 100%);
}

.biz-section-header {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 56px;
}

.biz-section-num {
  font-size: 80px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -3px;
  background: linear-gradient(180deg, var(--color-primary) 0%, rgba(30, 111, 255, 0.3) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  opacity: 0.3;
  flex-shrink: 0;
}

.biz-section.cat-blue .biz-section-num {
  background: linear-gradient(180deg, var(--color-primary) 0%, rgba(30, 111, 255, 0.2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.biz-section.cat-purple .biz-section-num {
  background: linear-gradient(180deg, var(--color-purple) 0%, rgba(124, 77, 255, 0.2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.biz-section.cat-orange .biz-section-num {
  background: linear-gradient(180deg, var(--color-accent) 0%, rgba(255, 138, 61, 0.2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.biz-section-info { flex: 1; }

.biz-section-info h2 {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.8px;
  margin-bottom: 8px;
}

.biz-section.cat-blue .biz-section-info h2 { color: var(--color-primary-dark); }
.biz-section.cat-purple .biz-section-info h2 { color: var(--color-purple); }
.biz-section.cat-orange .biz-section-info h2 { color: #d96a1f; }

.biz-section-info p {
  font-size: 16px;
  color: var(--color-text-light);
  line-height: 1.7;
  max-width: 640px;
}

.biz-section-meta {
  text-align: right;
  font-size: 13px;
  color: var(--color-text-mute);
  flex-shrink: 0;
}

.biz-section-meta strong {
  font-size: 24px;
  font-weight: 800;
  color: var(--color-text);
  display: block;
}

/* ============ 业务卡片 v3 ============ */
.biz-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.biz-card {
  background: #fff;
  border-radius: 16px;
  padding: 32px 28px;
  transition: all var(--transition);
  position: relative;
  border: 1px solid var(--color-border);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 280px;
}

.biz-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
}

.biz-card.cat-blue::before { background: var(--color-primary); }
.biz-card.cat-purple::before { background: var(--color-purple); }
.biz-card.cat-orange::before { background: var(--color-accent); }

.biz-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.biz-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.biz-card-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  position: relative;
}

.biz-card.cat-blue .biz-card-icon {
  background: linear-gradient(135deg, #1e6fff, #4d8cff);
}

.biz-card.cat-purple .biz-card-icon {
  background: linear-gradient(135deg, #7c4dff, #a78bfa);
}

.biz-card.cat-orange .biz-card-icon {
  background: linear-gradient(135deg, #ff8a3d, #ffb066);
}

.biz-card-icon svg { width: 26px; height: 26px; }

.biz-card-num {
  font-size: 36px;
  font-weight: 900;
  color: var(--color-border);
  line-height: 1;
  letter-spacing: -1.5px;
}

.biz-card-title {
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.3px;
  color: var(--color-text);
}

.biz-card-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 20px;
  flex: 1;
}

.biz-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}

.biz-tag {
  font-size: 12px;
  padding: 4px 10px;
  background: var(--color-bg-soft);
  color: var(--color-text-light);
  border-radius: 4px;
  font-weight: 500;
}

.biz-card.cat-blue .biz-tag {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.biz-card.cat-purple .biz-tag {
  background: var(--color-purple-light);
  color: var(--color-purple);
}

.biz-card.cat-orange .biz-tag {
  background: var(--color-accent-light);
  color: #c45a14;
}

/* ============ 统计 ============ */
.section-soft {
  background: var(--color-bg-soft);
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 40px 0;
}

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

.stat-num {
  font-size: 44px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-green));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -1.5px;
  line-height: 1.1;
}

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

.stat-note {
  font-size: 12px;
  color: var(--color-text-mute);
  margin-top: 4px;
  font-style: italic;
}

/* ============ Section 通用 ============ */
section { padding: 80px 0; }

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 13px;
  color: var(--color-primary);
  font-weight: 600;
  letter-spacing: 1.5px;
  margin-bottom: 14px;
  text-transform: uppercase;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.8px;
  margin-bottom: 14px;
  line-height: 1.25;
}

.section-desc {
  font-size: 16px;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ============ 服务流程 ============ */
.process {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}

.process-step {
  text-align: center;
  position: relative;
  padding: 32px 20px;
}

.process-step::after {
  content: "→";
  position: absolute;
  right: -16px;
  top: 36px;
  font-size: 24px;
  color: var(--color-border);
  font-weight: 300;
}

.process-step:last-child::after { display: none; }

.process-num {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-green));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 800;
  margin: 0 auto 20px;
  position: relative;
}

.process-num::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px dashed var(--color-primary-light);
}

.process-step h4 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.process-step p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ============ 客户案例 ============ */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.case-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 14px;
  overflow: hidden;
  transition: all var(--transition);
}

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

.case-img {
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-green-light));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.case-img.cat-orange { background: linear-gradient(135deg, var(--color-accent-light), #fff5ec); }
.case-img.cat-purple { background: linear-gradient(135deg, var(--color-purple-light), #f7f2ff); }

.case-img-label {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.92);
  border-radius: 100px;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: 0.5px;
}

.case-img-icon { font-size: 48px; opacity: 0.5; }

.case-content { padding: 24px; }

.case-industry {
  display: inline-block;
  font-size: 12px;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 3px 10px;
  border-radius: 4px;
  margin-bottom: 12px;
  font-weight: 600;
}

.case-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.4;
}

.case-desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 16px;
}

.case-meta {
  display: flex;
  gap: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border-light);
  font-size: 12px;
  color: var(--color-text-light);
}

.case-meta strong {
  color: var(--color-text);
  font-weight: 700;
  font-size: 14px;
  display: block;
}

/* ============ 核心优势 ============ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 14px;
  padding: 32px;
  transition: all var(--transition);
}

.feature-item:hover {
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon svg { width: 24px; height: 24px; }

.feature-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ============ FAQ ============ */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  margin-bottom: 12px;
  overflow: hidden;
  transition: all var(--transition);
}

.faq-item[open] {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.faq-q {
  padding: 20px 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  list-style: none;
}

.faq-q::-webkit-details-marker { display: none; }

.faq-q::after {
  content: "+";
  font-size: 22px;
  font-weight: 300;
  color: var(--color-text-mute);
  transition: transform var(--transition);
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item[open] .faq-q::after {
  transform: rotate(45deg);
  color: var(--color-primary);
}

.faq-a {
  padding: 0 24px 20px;
  color: var(--color-text-light);
  font-size: 15px;
  line-height: 1.8;
}

/* ============ CTA ============ */
.cta-block {
  background: linear-gradient(135deg, #1e6fff 0%, #00c2a8 100%);
  border-radius: 20px;
  padding: 64px 48px;
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.cta-block::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 50%;
}

.cta-block h2 {
  font-size: 34px;
  font-weight: 800;
  margin-bottom: 14px;
  position: relative;
  letter-spacing: -0.5px;
}

.cta-block p {
  font-size: 17px;
  opacity: 0.92;
  margin-bottom: 32px;
  position: relative;
}

.cta-block .btn-primary {
  background: #fff;
  color: var(--color-primary);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
  position: relative;
}

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

/* ============ Footer ============ */
.footer {
  background: #0e1422;
  color: #98a2b3;
  padding: 64px 0 24px;
}

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

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  margin-top: 16px;
  color: #6b7588;
  max-width: 280px;
}

.footer-col h4 {
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 18px;
}

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

.footer-col a {
  color: #98a2b3;
  font-size: 14px;
  transition: color var(--transition);
}

.footer-col a:hover { color: #fff; }

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid #1f2940;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: #6b7588;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom a { color: #6b7588; }
.footer-bottom a:hover { color: #fff; }

/* ============ 动画（默认可见，渐显增强） ============ */
.reveal {
  /* 默认就是可见的，不靠 JS 触发 */
  opacity: 1;
  transform: none;
}

.reveal-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============ 响应式 ============ */
@media (max-width: 960px) {
  .hero-inner,
  .biz-grid,
  .features-grid,
  .case-grid,
  .process,
  .biz-overview-grid {
    grid-template-columns: 1fr;
  }

  .hero { padding: 56px 0 40px; }
  .hero h1 { font-size: 36px; }
  .hero-desc { font-size: 16px; }

  section { padding: 56px 0; }
  .section-title { font-size: 28px; }
  .biz-section { padding: 56px 0; }
  .biz-section-header { flex-direction: column; align-items: flex-start; gap: 16px; }
  .biz-section-num { font-size: 56px; }
  .biz-section-info h2 { font-size: 26px; }
  .biz-section-meta { text-align: left; }
  .process-step::after { display: none; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .cta-block { padding: 40px 24px; }
  .cta-block h2 { font-size: 24px; }

  .nav { display: none; }
  .nav.open {
    display: flex;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: #fff;
    padding: 24px;
    gap: 8px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    align-items: stretch;
  }
  .nav.open .nav-item { width: 100%; }
  .nav.open .nav-link { padding: 12px; justify-content: space-between; }
  .nav.open .nav-dropdown {
    position: static;
    transform: none;
    box-shadow: none;
    border: none;
    opacity: 1;
    visibility: visible;
    padding: 0 0 0 16px;
  }
  .menu-toggle { display: block; }
}

@media (max-width: 540px) {
  .hero h1 { font-size: 28px; }
  .stat-num { font-size: 32px; }
  .cta-block h2 { font-size: 22px; }
  .biz-card { padding: 24px 20px; min-height: 240px; }
}