/**
 * 纳海川官方网站 - 现代中式浅色高端专业风格规范 CSS
 * 色彩体系:
 *   背景: #FFFFFF / #F8FAFC / #F1F5F9
 *   主色: #2563EB (科技蓝)
 *   辅助: #06B6D4 (青) / #7C3AED (紫)
 *   文字: #0F172A (主标题) / #475569 (正文) / #94A3B8 (辅弱)
 *   印章红: #DC2626 (朱砂)
 * 字体:
 *   标题宋体: "Noto Serif SC", "Source Han Serif SC", "SimSun", "Songti SC", serif
 *   正文黑体: "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif
 * 网格: 12 列网格，1280px 最大宽度，圆角 4px - 6px，细线边框，水墨抽象底纹，窗棂格构架
 */

:root {
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8FAFC;
  --bg-tertiary: #F1F5F9;
  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --primary-light: #EFF6FF;
  --accent-cyan: #06B6D4;
  --accent-purple: #7C3AED;
  --seal-red: #DC2626;
  --seal-red-bg: #FEF2F2;
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --border-color: #E2E8F0;
  --border-subtle: #F1F5F9;
  --radius-sm: 4px;
  --radius-md: 6px;
  --shadow-subtle: 0 1px 3px rgba(15, 23, 42, 0.05);
  --shadow-card: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
  --shadow-hover: 0 12px 28px -4px rgba(37, 99, 235, 0.08);
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "SimSun", "Songti SC", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

/* 基础重置与重构 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body.body_index {
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.25s ease;
}

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

/* 1280px 12 列网格容器 */
.nhc-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* 现代中式印章徽记 */
.nhc-seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 8px;
  border: 1px solid var(--seal-red);
  background-color: var(--seal-red-bg);
  color: var(--seal-red);
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: 2px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  user-select: none;
}

.nhc-seal-square {
  width: 32px;
  height: 32px;
  padding: 0;
  border: 1.5px solid var(--seal-red);
  font-size: 11px;
  line-height: 1.1;
  text-align: center;
  writing-mode: vertical-rl;
  letter-spacing: 1px;
}

/* 现代中式窗棂格与细线装饰 */
.nhc-lattice-pattern {
  background-image: 
    linear-gradient(to right, rgba(226, 232, 240, 0.4) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(226, 232, 240, 0.4) 1px, transparent 1px);
  background-size: 40px 40px;
}

.nhc-section-header {
  text-align: center;
  margin-bottom: 56px;
  position: relative;
}

.nhc-section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.nhc-section-tag .nhc-tag-text {
  font-size: 13px;
  letter-spacing: 3px;
  color: var(--primary);
  font-weight: 600;
  text-transform: uppercase;
}

.nhc-section-title {
  font-family: var(--font-serif);
  font-size: 34px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 1px;
  margin-bottom: 16px;
  position: relative;
  display: inline-block;
}

.nhc-section-desc {
  max-width: 680px;
  margin: 0 auto;
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.8;
}

.nhc-line-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin: 16px auto 0;
  width: 140px;
}

.nhc-line-divider::before,
.nhc-line-divider::after {
  content: "";
  height: 1px;
  flex: 1;
  background-color: var(--border-color);
}

.nhc-line-divider span {
  width: 6px;
  height: 6px;
  transform: rotate(45deg);
  background-color: var(--primary);
}

/* 导航栏设计 */
.nhc-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.nhc-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.nhc-logo {
  display: flex;
  align-items: center;
  gap: 14px;
}

.nhc-logo img {
  height: 38px;
  width: auto;
}

.nhc-logo-brand {
  display: flex;
  flex-direction: column;
}

.nhc-logo-text {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 1.5px;
  line-height: 1.2;
}

.nhc-logo-sub {
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.nhc-nav-menu {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.nhc-nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 8px 0;
  transition: color 0.2s;
}

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

.nhc-nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.25s ease;
  border-radius: 1px;
}

.nhc-nav-link:hover::after,
.nhc-nav-link.active::after {
  width: 100%;
}

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

.nhc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.25s ease;
  border: 1px solid transparent;
}

.nhc-btn-primary {
  background-color: var(--primary);
  color: #FFFFFF;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

.nhc-btn-primary:hover {
  background-color: var(--primary-hover);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
  transform: translateY(-1px);
}

.nhc-btn-outline {
  border-color: var(--border-color);
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

.nhc-btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background-color: var(--primary-light);
}

.nhc-btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

.nhc-btn-lg {
  padding: 14px 32px;
  font-size: 16px;
}

/* ==========================================================================
   高端大气首屏轮播图系统 (Hero Panoramic Carousel)
   ========================================================================== */
.nhc-hero-carousel-wrap {
  position: relative;
  width: 100%;
  overflow: hidden;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding-top: 76px; /* 避开固定导航栏 */
}

.nhc-carousel {
  position: relative;
  width: 100%;
  min-height: 700px;
  overflow: hidden;
}

.nhc-carousel-track {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 700px;
}

.nhc-carousel-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  min-height: 700px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.8s;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 70px 0 90px;
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  z-index: 1;
}

.nhc-carousel-slide.active {
  opacity: 1;
  visibility: visible;
  z-index: 2;
}

/* 轮播图幻灯片不同主题背景与中式意境光影 (浅色高雅、通透水墨微晕) */
.nhc-slide-theme-1 {
  background: 
    radial-gradient(circle at 50% 18%, rgba(37, 99, 235, 0.08) 0%, transparent 48%),
    radial-gradient(circle at 82% 65%, rgba(6, 182, 212, 0.07) 0%, transparent 45%),
    radial-gradient(circle at 18% 75%, rgba(124, 58, 237, 0.04) 0%, transparent 40%),
    linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
}

.nhc-slide-theme-2 {
  background: 
    radial-gradient(circle at 80% 25%, rgba(37, 99, 235, 0.09) 0%, transparent 50%),
    radial-gradient(circle at 20% 60%, rgba(6, 182, 212, 0.06) 0%, transparent 45%),
    linear-gradient(180deg, #F8FAFC 0%, #FFFFFF 100%);
}

.nhc-slide-theme-3 {
  background: 
    radial-gradient(circle at 50% 20%, rgba(6, 182, 212, 0.09) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(124, 58, 237, 0.06) 0%, transparent 50%),
    linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
}

.nhc-slide-theme-4 {
  background: 
    radial-gradient(circle at 20% 30%, rgba(124, 58, 237, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(37, 99, 235, 0.08) 0%, transparent 55%),
    linear-gradient(180deg, #F8FAFC 0%, #FFFFFF 100%);
}

/* 轮播图切换过渡微动画 */
.nhc-carousel-slide .nhc-hero-content {
  transform: translateY(24px) scale(0.99);
  transition: transform 0.85s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.85s;
  opacity: 0;
}

.nhc-carousel-slide.active .nhc-hero-content {
  transform: translateY(0) scale(1);
  opacity: 1;
}

/* 轮播图左右悬浮控制按钮 (高定毛玻璃气泡) */
.nhc-carousel-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(226, 232, 240, 0.9);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
}

.nhc-carousel-prev {
  left: 36px;
}

.nhc-carousel-next {
  right: 36px;
}

.nhc-carousel-nav:hover {
  background: var(--primary);
  color: #FFFFFF;
  border-color: var(--primary);
  transform: translateY(-50%) scale(1.1);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
}

.nhc-carousel-nav:active {
  transform: translateY(-50%) scale(0.95);
}

/* 底部高定长条指示器与编号 */
.nhc-carousel-indicators {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 10;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 6px 16px;
  border-radius: 30px;
  border: 1px solid rgba(226, 232, 240, 0.85);
  box-shadow: 0 6px 20px rgba(15, 23, 42, 0.05);
}

.nhc-carousel-dot {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 20px;
  transition: all 0.3s ease;
  user-select: none;
}

.nhc-carousel-dot-num {
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  transition: color 0.3s;
}

.nhc-carousel-dot-bar {
  width: 20px;
  height: 3px;
  border-radius: 2px;
  background: rgba(203, 213, 225, 0.8);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.nhc-carousel-dot:hover .nhc-carousel-dot-num,
.nhc-carousel-dot.active .nhc-carousel-dot-num {
  color: var(--primary);
}

.nhc-carousel-dot:hover .nhc-carousel-dot-bar {
  background: #93C5FD;
}

.nhc-carousel-dot.active .nhc-carousel-dot-bar {
  width: 56px;
  background: var(--primary);
  box-shadow: 0 0 10px rgba(37, 99, 235, 0.4);
}

/* 窗棂细线折角微装饰 (Corner Accents) */
.nhc-corner-card {
  position: relative;
}

.nhc-corner-card::after {
  content: "";
  position: absolute;
  top: 8px;
  right: 8px;
  width: 14px;
  height: 14px;
  border-top: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  pointer-events: none;
  transition: border-color 0.3s;
}

.nhc-corner-card:hover::after {
  border-color: var(--primary);
}

/* 首屏 (Hero Section) 样式微调 */
.nhc-hero {
  padding-top: 120px;
  padding-bottom: 90px;
  position: relative;
  background: radial-gradient(circle at 50% 10%, rgba(37, 99, 235, 0.05) 0%, rgba(255, 255, 255, 0) 70%),
              linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
  border-bottom: 1px solid var(--border-color);
  overflow: hidden;
}

.nhc-hero-content {
  text-align: center;
  max-width: 960px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.nhc-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  padding: 6px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
  box-shadow: var(--shadow-subtle);
}

.nhc-hero-badge-text {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
}

.nhc-hero-title {
  font-family: var(--font-serif);
  font-size: 52px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
  letter-spacing: 2px;
  margin-bottom: 24px;
}

.nhc-hero-title span.highlight {
  color: var(--primary);
  position: relative;
  display: inline-block;
}

.nhc-hero-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 780px;
  margin: 0 auto 36px;
}

.nhc-hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 64px;
}

.nhc-hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  box-shadow: var(--shadow-subtle);
}

.nhc-metric-item {
  text-align: center;
  position: relative;
}

.nhc-metric-item:not(:last-child)::after {
  content: "";
  position: absolute;
  right: 0;
  top: 15%;
  height: 70%;
  width: 1px;
  background: var(--border-color);
}

.nhc-metric-val {
  font-family: var(--font-sans);
  font-size: 36px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.1;
  margin-bottom: 6px;
}

.nhc-metric-val sub {
  font-size: 18px;
  font-weight: 600;
  bottom: 0;
}

.nhc-metric-label {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
  letter-spacing: 0.5px;
}

/* 核心服务板块 (Services Section) */
.nhc-services {
  padding: 96px 0;
  background-color: var(--bg-primary);
  position: relative;
}

.nhc-services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.nhc-service-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 40px 32px;
  position: relative;
  transition: all 0.3s ease;
  overflow: hidden;
  box-shadow: var(--shadow-subtle);
}

.nhc-service-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: transparent;
  transition: background 0.3s ease;
}

.nhc-service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: #BFDBFE;
}

.nhc-service-card:hover::before {
  background: var(--primary);
}

.nhc-service-watermark {
  position: absolute;
  top: 20px;
  right: 24px;
  font-family: var(--font-serif);
  font-size: 48px;
  color: rgba(226, 232, 240, 0.4);
  font-weight: 700;
  line-height: 1;
  user-select: none;
}

.nhc-service-icon {
  width: 54px;
  height: 54px;
  background: var(--primary-light);
  border: 1px solid rgba(37, 99, 235, 0.15);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 24px;
}

.nhc-service-title {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.nhc-service-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.nhc-service-list {
  list-style: none;
  border-top: 1px dashed var(--border-color);
  padding-top: 20px;
  margin-bottom: 24px;
}

.nhc-service-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.nhc-service-item::before {
  content: "";
  width: 4px;
  height: 4px;
  background: var(--primary);
  border-radius: 50%;
}

.nhc-service-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
}

.nhc-service-link:hover {
  gap: 10px;
}

/* 核心产品矩阵 (Products Section) */
.nhc-products {
  padding: 96px 0;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  position: relative;
}

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

.nhc-product-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-subtle);
  position: relative;
}

.nhc-product-card:hover {
  transform: translateY(-4px);
  border-color: #BFDBFE;
  box-shadow: var(--shadow-hover);
}

.nhc-product-header {
  margin-bottom: 20px;
}

.nhc-product-type-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  color: var(--primary);
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

.nhc-product-name {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.nhc-product-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.nhc-product-features {
  list-style: none;
  margin: 18px 0;
  padding: 16px 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.nhc-product-feat-item {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nhc-product-feat-item svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.nhc-product-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
}

.nhc-product-tag {
  font-size: 11px;
  color: var(--text-muted);
}

/* 标杆案例 (Cases Section) */
.nhc-cases {
  padding: 96px 0;
  background-color: var(--bg-primary);
  position: relative;
}

.nhc-cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.nhc-case-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 36px 32px;
  box-shadow: var(--shadow-subtle);
  transition: all 0.3s ease;
  position: relative;
}

.nhc-case-card:hover {
  border-color: #BFDBFE;
  box-shadow: var(--shadow-card);
  transform: translateY(-3px);
}

.nhc-case-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.nhc-case-category {
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-light);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
}

.nhc-case-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.4;
}

.nhc-case-details {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.nhc-case-detail-row {
  display: flex;
  font-size: 13px;
  line-height: 1.6;
}

.nhc-case-detail-label {
  width: 72px;
  flex-shrink: 0;
  color: var(--text-muted);
  font-weight: 500;
}

.nhc-case-detail-content {
  color: var(--text-secondary);
}

.nhc-case-metrics-bar {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-around;
}

.nhc-case-metric-box {
  text-align: center;
}

.nhc-case-metric-num {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
}

.nhc-case-metric-sub {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* 标准化交付流程 (Process Section) */
.nhc-process {
  padding: 96px 0;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  position: relative;
}

.nhc-process-flow {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  position: relative;
}

.nhc-process-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px 20px;
  text-align: center;
  position: relative;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-subtle);
}

.nhc-process-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-card);
}

.nhc-process-step-num {
  width: 36px;
  height: 36px;
  margin: 0 auto 16px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 700;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(37, 99, 235, 0.2);
}

.nhc-process-step-title {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.nhc-process-step-desc {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 客户评价与合作伙伴 (Testimonials & Clients) */
.nhc-testimonials {
  padding: 96px 0;
  background-color: var(--bg-primary);
  position: relative;
}

.nhc-testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 56px;
}

.nhc-testimonial-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  box-shadow: var(--shadow-subtle);
  position: relative;
  transition: all 0.3s ease;
}

.nhc-testimonial-card:hover {
  border-color: #BFDBFE;
  box-shadow: var(--shadow-card);
}

.nhc-quote-icon {
  font-family: var(--font-serif);
  font-size: 36px;
  color: #BFDBFE;
  line-height: 1;
  margin-bottom: 12px;
}

.nhc-testimonial-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
}

.nhc-testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

.nhc-author-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--primary);
  border: 1px solid var(--border-color);
}

.nhc-author-info {
  display: flex;
  flex-direction: column;
}

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

.nhc-author-role {
  font-size: 12px;
  color: var(--text-muted);
}

/* 合作客户 Logo 墙 */
.nhc-clients-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
}

.nhc-client-item {
  height: 72px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 600;
  letter-spacing: 1px;
  transition: all 0.2s ease;
}

.nhc-client-item:hover {
  background: #FFFFFF;
  border-color: var(--primary);
  color: var(--primary);
}

/* 底部 CTA 板块 */
.nhc-cta {
  padding: 80px 0;
  background: linear-gradient(135deg, #1E3A8A 0%, #1E40AF 50%, #2563EB 100%);
  color: #FFFFFF;
  position: relative;
  overflow: hidden;
}

.nhc-cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.nhc-cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: 2;
  gap: 40px;
}

.nhc-cta-content {
  max-width: 680px;
}

.nhc-cta-title {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
  letter-spacing: 1px;
}

.nhc-cta-desc {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.7;
}

.nhc-cta-buttons {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.nhc-cta-btn-light {
  background-color: #FFFFFF;
  color: var(--primary);
  border: 1px solid #FFFFFF;
}

.nhc-cta-btn-light:hover {
  background-color: var(--bg-secondary);
  color: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.nhc-cta-btn-ghost {
  border-color: rgba(255, 255, 255, 0.4);
  color: #FFFFFF;
  background: transparent;
}

.nhc-cta-btn-ghost:hover {
  border-color: #FFFFFF;
  background: rgba(255, 255, 255, 0.1);
}

/* 现代化专业页脚 (Footer) */
.nhc-footer {
  background-color: #0F172A;
  color: #94A3B8;
  padding: 80px 0 32px;
  border-top: 1px solid #1E293B;
  font-size: 14px;
}

.nhc-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 56px;
}

.nhc-footer-brand-title {
  font-family: var(--font-serif);
  font-size: 20px;
  color: #FFFFFF;
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.nhc-footer-brand-desc {
  font-size: 13px;
  line-height: 1.8;
  margin-bottom: 20px;
  color: #64748B;
}

.nhc-footer-col-title {
  font-family: var(--font-serif);
  font-size: 15px;
  color: #FFFFFF;
  font-weight: 600;
  margin-bottom: 18px;
  letter-spacing: 1px;
}

.nhc-footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.nhc-footer-link {
  color: #94A3B8;
  font-size: 13px;
  transition: color 0.2s;
}

.nhc-footer-link:hover {
  color: #FFFFFF;
}

.nhc-footer-contact-info {
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 13px;
}

.nhc-footer-bottom {
  border-top: 1px solid #1E293B;
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: #64748B;
}

.nhc-footer-bottom a {
  color: #64748B;
}

.nhc-footer-bottom a:hover {
  color: #94A3B8;
}

/* 响应式适配媒体查询 */
@media (max-width: 1200px) {
  .nhc-products-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nhc-footer-grid {
    grid-template-columns: 2fr repeat(3, 1fr);
  }
}

@media (max-width: 1024px) {
  .nhc-hero-title {
    font-size: 42px;
  }
  .nhc-services-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .nhc-process-flow {
    grid-template-columns: repeat(3, 1fr);
  }
  .nhc-clients-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .nhc-testimonials-grid {
    grid-template-columns: 1fr;
  }
  .nhc-cta-inner {
    flex-direction: column;
    text-align: center;
  }
  .nhc-footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nhc-nav-menu,
  .nhc-nav-actions .nhc-btn {
    display: none;
  }
  /* 移动端全景轮播图优雅适配 */
  .nhc-carousel {
    min-height: 600px;
  }
  .nhc-carousel-track {
    min-height: 600px;
  }
  .nhc-carousel-slide {
    min-height: 600px;
    padding: 40px 16px 72px;
  }
  .nhc-carousel-nav {
    display: none; /* 移动端主打触控滑动手势与底部指示器 */
  }
  .nhc-carousel-indicators {
    bottom: 16px;
    padding: 4px 12px;
    gap: 8px;
  }
  .nhc-carousel-dot-bar {
    width: 14px;
  }
  .nhc-carousel-dot.active .nhc-carousel-dot-bar {
    width: 36px;
  }
  .nhc-hero-title {
    font-size: 32px;
  }
  .nhc-hero-subtitle {
    font-size: 15px;
  }
  .nhc-hero-metrics {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .nhc-metric-item:not(:last-child)::after {
    display: none;
  }
  .nhc-products-grid {
    grid-template-columns: 1fr;
  }
  .nhc-cases-grid {
    grid-template-columns: 1fr;
  }
  .nhc-process-flow {
    grid-template-columns: 1fr;
  }
  .nhc-clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nhc-footer-grid {
    grid-template-columns: 1fr;
  }
  .nhc-footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
  .nhc-cta-buttons {
    flex-direction: column;
    width: 100%;
  }
  .nhc-cta-buttons .nhc-btn {
    width: 100%;
  }
}

/* ==========================================================================
   服务独立页专有样式 (Services Page Modern Style)
   ========================================================================== */
.nhc-page-hero {
  position: relative;
  padding: 130px 0 70px;
  background: 
    radial-gradient(circle at 50% 15%, rgba(37, 99, 235, 0.07) 0%, transparent 55%),
    radial-gradient(circle at 85% 60%, rgba(6, 182, 212, 0.05) 0%, transparent 45%),
    linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

.nhc-breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.nhc-breadcrumb a {
  color: var(--text-secondary);
  transition: color 0.2s;
}

.nhc-breadcrumb a:hover {
  color: var(--primary);
}

.nhc-page-title {
  font-family: var(--font-serif);
  font-size: 44px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 1.5px;
  margin-bottom: 18px;
}

.nhc-page-desc {
  max-width: 760px;
  margin: 0 auto 30px;
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* 服务三大领域深度卡片 (交替错落或大横幅) */
.nhc-service-detail-section {
  padding: 90px 0;
}

.nhc-service-detail-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 48px;
  margin-bottom: 40px;
  box-shadow: var(--shadow-subtle);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.nhc-service-detail-card:hover {
  border-color: rgba(37, 99, 235, 0.3);
  box-shadow: 0 16px 36px -10px rgba(15, 23, 42, 0.08);
}

.nhc-service-detail-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
}

.nhc-service-tagline {
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--primary);
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.nhc-service-detail-title {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.nhc-service-detail-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.nhc-tech-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.nhc-tech-pill {
  font-size: 12px;
  font-family: var(--font-sans);
  background: #F1F5F9;
  color: #334155;
  padding: 4px 12px;
  border-radius: 4px;
  border: 1px solid #E2E8F0;
  font-weight: 500;
}

.nhc-feature-checklist {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 28px;
}

.nhc-feature-check-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-primary);
}

.nhc-feature-check-item svg {
  color: var(--primary);
  flex-shrink: 0;
}

/* 服务卡片右侧视窗展示盒 */
.nhc-service-visual-box {
  background: #F8FAFC;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 32px;
  position: relative;
}

.nhc-visual-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nhc-visual-spec-item {
  background: #FFFFFF;
  border: 1px solid #E2E8F0;
  border-radius: 4px;
  padding: 14px 16px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.nhc-spec-val {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

/* 全栈技术底座架构全景 (四层架构蓝图) */
.nhc-tech-stack-section {
  padding: 80px 0;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.nhc-architecture-diagram {
  max-width: 1040px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.nhc-arch-layer {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 24px 28px;
  box-shadow: var(--shadow-subtle);
  display: grid;
  grid-template-columns: 200px 1fr;
  align-items: center;
  gap: 24px;
  transition: border-color 0.25s;
}

.nhc-arch-layer:hover {
  border-color: var(--primary);
}

.nhc-arch-layer-header {
  border-right: 1px solid var(--border-color);
  padding-right: 20px;
}

.nhc-arch-layer-name {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.nhc-arch-layer-sub {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.nhc-arch-items {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.nhc-arch-badge {
  background: #F8FAFC;
  border: 1px solid #E2E8F0;
  padding: 8px 16px;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* 标准化 8 大交付物清单 */
.nhc-deliverables-section {
  padding: 90px 0;
}

.nhc-deliverables-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.nhc-deliverable-item {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 24px 20px;
  box-shadow: var(--shadow-subtle);
  transition: all 0.25s ease;
  position: relative;
}

.nhc-deliverable-item:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
  box-shadow: 0 10px 24px -5px rgba(15, 23, 42, 0.08);
}

.nhc-deliverable-icon {
  width: 40px;
  height: 40px;
  border-radius: 6px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}

.nhc-deliverable-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.nhc-deliverable-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* SLA 服务信赖横幅 */
.nhc-sla-banner {
  background: linear-gradient(135deg, #1E293B 0%, #0F172A 100%);
  border-radius: var(--radius-md);
  padding: 40px 48px;
  color: #FFFFFF;
  margin: 40px 0 80px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 32px;
}

.nhc-sla-col {
  border-right: 1px solid rgba(255, 255, 255, 0.1);
  padding-right: 28px;
}

.nhc-sla-col:last-child {
  border-right: none;
  padding-right: 0;
}

.nhc-sla-val {
  font-family: var(--font-sans);
  font-size: 28px;
  font-weight: 700;
  color: #60A5FA;
  margin-bottom: 6px;
}

.nhc-sla-label {
  font-size: 14px;
  font-weight: 600;
  color: #FFFFFF;
  margin-bottom: 4px;
}

.nhc-sla-desc {
  font-size: 12px;
  color: #94A3B8;
  line-height: 1.6;
}

/* FAQ 问答手风琴列表 */
.nhc-faq-section {
  padding: 80px 0;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

.nhc-faq-container {
  max-width: 860px;
  margin: 0 auto;
}

.nhc-faq-item {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  overflow: hidden;
  transition: border-color 0.2s;
}

.nhc-faq-item.active {
  border-color: var(--primary);
}

.nhc-faq-q {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  user-select: none;
}

.nhc-faq-q svg {
  color: var(--text-muted);
  transition: transform 0.3s;
}

.nhc-faq-item.active .nhc-faq-q svg {
  transform: rotate(180deg);
  color: var(--primary);
}

.nhc-faq-a {
  padding: 0 24px 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
  border-top: 1px solid transparent;
}

.nhc-faq-item:not(.active) .nhc-faq-a {
  display: none;
}

/* 响应式微调 */
@media (max-width: 1024px) {
  .nhc-service-detail-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .nhc-arch-layer {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .nhc-arch-layer-header {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
  }
  .nhc-deliverables-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nhc-sla-banner {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .nhc-sla-col {
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 16px;
  }
  .nhc-sla-col:last-child {
    border-bottom: none;
  }
}

@media (max-width: 768px) {
  .nhc-page-title {
    font-size: 32px;
  }
  .nhc-service-detail-card {
    padding: 24px;
  }
  .nhc-feature-checklist {
    grid-template-columns: 1fr;
  }
  .nhc-deliverables-grid {
    grid-template-columns: 1fr;
  }
}