/* ==========================================================================
   北京智子科技有限公司官网样式表
   主题：红白主色 + 深蓝灰稳重辅色
   说明：修改 :root 中的 CSS 变量即可快速调整全局配色
   ========================================================================== */

:root {
  /* 品牌色 */
  --color-primary: #D6001C;
  --color-primary-dark: #B00016;
  --color-primary-light: #FF334D;
  --color-primary-soft: rgba(214, 0, 28, 0.08);

  /* 稳重辅色（用于标题、深色背景、页脚） */
  --color-dark: #0F172A;
  --color-dark-2: #1E293B;
  --color-text: #334155;
  --color-text-light: #64748B;
  --color-muted: #94A3B8;

  /* 背景色 */
  --color-bg: #FFFFFF;
  --color-bg-soft: #F8FAFC;
  --color-bg-gray: #F1F5F9;
  --color-border: #E2E8F0;

  /* 字体 */
  --font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  /* 间距 */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* 容器 */
  --container-width: 1200px;
  --container-padding: 1.25rem;

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 10px 25px -5px rgba(15, 23, 42, 0.12), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
  --shadow-red: 0 8px 24px rgba(214, 0, 28, 0.22);

  /* 动画 */
  --transition: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-sm);
  z-index: 9999;
  padding: 0.5rem 1rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 500;
  transition: top 0.2s;
}

.skip-link:focus {
  top: var(--space-sm);
}

/* ==========================================================================
   布局工具
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.section {
  padding: var(--space-2xl) 0;
}

.section.light {
  background-color: var(--color-bg-soft);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--space-xl);
}

.section-tag {
  display: inline-block;
  padding: 0.35rem 0.9rem;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  border-radius: 999px;
  margin-bottom: var(--space-sm);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 900;
  color: var(--color-dark);
  line-height: 1.2;
  margin-bottom: var(--space-sm);
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-light);
}

/* ==========================================================================
   按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-red);
}

.btn-primary:hover,
.btn-primary:focus {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline:hover,
.btn-outline:focus {
  background: rgba(255, 255, 255, 0.1);
  border-color: #fff;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   顶部导航
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.96);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}

.site-header.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

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

.logo-link {
  display: inline-flex;
  align-items: center;
}

.logo {
  width: 160px;
  height: auto;
}

.main-nav {
  display: flex;
  align-items: center;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-menu a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-dark-2);
  position: relative;
  transition: color var(--transition);
}

.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition);
}

.nav-menu a:hover,
.nav-menu a:focus {
  color: var(--color-primary);
}

.nav-menu a:hover::after,
.nav-menu a:focus::after {
  width: 100%;
}

.nav-menu .nav-cta {
  padding: 0.5rem 1.25rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-md);
}

.nav-menu .nav-cta::after {
  display: none;
}

.nav-menu .nav-cta:hover,
.nav-menu .nav-cta:focus {
  background: var(--color-primary-dark);
  color: #fff;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: none;
  background: transparent;
  cursor: pointer;
  position: relative;
  z-index: 1001;
}

.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-dark);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.hamburger {
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: "";
  position: absolute;
  left: 0;
}

.hamburger::before {
  top: -7px;
}

.hamburger::after {
  top: 7px;
}

.nav-toggle[aria-expanded="true"] .hamburger {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
  top: 0;
  transform: rotate(-45deg);
}

/* ==========================================================================
   Hero 首屏
   ========================================================================== */
.hero {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 8rem 0 1.5rem;
  background: url('../assets/img/hero-bg.jpg') center/cover no-repeat;
  color: #fff;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(11, 18, 32, 0.88) 0%, rgba(15, 23, 42, 0.55) 55%, rgba(30, 41, 59, 0.62) 100%);
  z-index: 0;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.grid-pattern {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.5;
}

.hero-glow {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 60%;
  height: 80%;
  background: radial-gradient(circle, rgba(214, 0, 28, 0.28) 0%, transparent 70%);
  pointer-events: none;
}

/* 向下滚动指示器 */
.scroll-indicator {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  width: 26px;
  height: 42px;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-radius: 13px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
  transition: border-color var(--transition);
}

.scroll-indicator:hover {
  border-color: rgba(255, 255, 255, 0.9);
}

.scroll-indicator span {
  display: block;
  width: 4px;
  height: 8px;
  background: #fff;
  border-radius: 2px;
  animation: scrollBounce 1.6s infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: translateY(0); opacity: 0.8; }
  50% { transform: translateY(8px); opacity: 0.3; }
}

.hero-content {
  position: relative;
  z-index: 1;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  max-width: 960px;
  margin: 0 auto;
  gap: var(--space-md);
}

.hero-label {
  display: inline-block;
  padding: 0.4rem 1rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--space-xs);
}

.hero-emblem {
  width: 130px;
  height: 130px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-xs);
  filter: drop-shadow(0 0 24px rgba(214, 0, 28, 0.45));
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: var(--space-sm);
}

.text-red {
  color: var(--color-primary-light);
}

.hero-desc {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.85);
  max-width: 640px;
  margin: 0 auto var(--space-md);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
}

.hero-chips {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.6rem;
  margin: var(--space-sm) auto 0;
  width: 100%;
  max-width: 760px;
}

.hero-chips span {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.45rem 0.2rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.92);
  text-align: center;
  white-space: nowrap;
}

@media (max-width: 640px) {
  .hero-chips {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Hero 数据条 */
.hero-stats {
  position: relative;
  z-index: 1;
  background: rgba(0, 0, 0, 0.25);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  margin-top: var(--space-2xl);
  padding: var(--space-lg) 0;
  backdrop-filter: blur(4px);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  text-align: center;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-number {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  color: #fff;
  line-height: 1;
}

.stat-number .unit {
  font-size: 0.55em;
  margin-left: 0.1em;
  color: var(--color-primary-light);
}

.stat-label {
  margin-top: 0.5rem;
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.75);
}

/* ==========================================================================
   Full-bleed 科技大图通栏
   ========================================================================== */
.flush {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 560px;
  padding: var(--space-2xl) 0;
  color: #fff;
  overflow: hidden;
  text-align: center;
}

.flush::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  background-repeat: no-repeat;
}

.flush::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, rgba(11, 18, 32, 0.78) 0%, rgba(11, 18, 32, 0.62) 50%, rgba(11, 18, 32, 0.78) 100%);
  pointer-events: none;
}

.flush-manifesto::before {
  background-image: url('../assets/img/banner-manifesto.jpg');
}

.flush-capability::before {
  background-image: url('../assets/img/banner-capability.jpg');
}

.flush-data::before {
  background-image: url('../assets/img/banner-data.jpg');
}

.flush-content {
  position: relative;
  z-index: 2;
  max-width: 960px;
}

.flush-kicker {
  display: inline-block;
  margin-bottom: var(--space-sm);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--color-primary-light);
}

.flush-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: var(--space-md);
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.35);
}

.flush-lead {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: rgba(255, 255, 255, 0.85);
  max-width: 760px;
  margin: 0 auto var(--space-xl);
  line-height: 1.8;
}

/* 通栏内统计 */
.flush-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  max-width: 720px;
  margin: 0 auto;
}

.flush-stats > div {
  padding: var(--space-md);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(6px);
}

.flush-number {
  display: block;
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1;
  color: #fff;
}

.flush-number .unit {
  font-size: 0.5em;
  color: var(--color-primary-light);
  margin-left: 0.1em;
}

.flush-label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.75);
}

/* 通栏卡片网格 */
.flush-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  text-align: left;
}

.flush-card {
  padding: var(--space-md);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  backdrop-filter: blur(6px);
}

.flush-card:hover {
  background: rgba(214, 0, 28, 0.15);
  border-color: rgba(214, 0, 28, 0.4);
  transform: translateY(-4px);
}

.flush-card strong {
  display: block;
  font-size: 1.1rem;
  margin-bottom: 0.35rem;
  color: #fff;
}

.flush-card span {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.6;
}

/* 数据驱动三点 */
.flush-data-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  text-align: left;
}

.data-point {
  padding: var(--space-lg);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(6px);
}

.data-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-weight: 900;
  margin-bottom: var(--space-sm);
}

.data-point h3 {
  font-size: 1.15rem;
  color: #fff;
  margin-bottom: 0.5rem;
}

.data-point p {
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.7;
}

/* ==========================================================================
   关于我们
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-xl);
  align-items: start;
}

.about-text .lead {
  font-size: 1.2rem;
  color: var(--color-dark);
  font-weight: 500;
  margin-bottom: var(--space-md);
}

.about-text p {
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.culture-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.culture-card {
  padding: var(--space-md);
  background: var(--color-bg-soft);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
}

.culture-card strong {
  display: block;
  font-size: 1.1rem;
  color: var(--color-dark);
  margin-bottom: 0.25rem;
}

.culture-card p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin: 0;
}

.about-card {
  padding: var(--space-lg);
  background: var(--color-bg-soft);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
}

.about-card h3 {
  font-size: 1.25rem;
  color: var(--color-dark);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: 2px solid var(--color-primary);
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.98rem;
}

.feature-list li:last-child {
  border-bottom: none;
}

.feature-icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
}

/* ==========================================================================
   核心业务
   ========================================================================== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.service-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(214, 0, 28, 0.25);
}

.service-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
}

.service-card h3 {
  font-size: 1.2rem;
  color: var(--color-dark);
  margin-bottom: 0.75rem;
}

.service-card > p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
}

.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.service-tags li {
  padding: 0.25rem 0.65rem;
  background: var(--color-bg-gray);
  color: var(--color-text);
  font-size: 0.8rem;
  border-radius: 999px;
}

/* ==========================================================================
   解决方案
   ========================================================================== */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.solution-card {
  position: relative;
  padding: var(--space-lg);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.solution-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--color-primary);
}

.solution-num {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--color-primary-soft);
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.solution-card h3 {
  font-size: 1.15rem;
  color: var(--color-dark);
  margin-bottom: 0.75rem;
}

.solution-card p {
  font-size: 0.95rem;
  color: var(--color-text-light);
}

/* 业务范围 */
.coverage-block {
  background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-2) 100%);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.coverage-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.coverage-header h3 {
  font-size: 1.75rem;
  margin-bottom: var(--space-xs);
}

.coverage-header p {
  color: rgba(255, 255, 255, 0.75);
}

.coverage-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.coverage-item {
  padding: var(--space-md);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  text-align: center;
  transition: all var(--transition);
}

.coverage-item:hover {
  background: rgba(214, 0, 28, 0.15);
  border-color: rgba(214, 0, 28, 0.4);
}

.coverage-item strong {
  display: block;
  font-size: 1.1rem;
  margin-bottom: 0.35rem;
}

.coverage-item span {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
}

/* ==========================================================================
   签约客户
   ========================================================================== */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.client-category {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

.client-category h3 {
  font-size: 1.15rem;
  color: var(--color-dark);
  margin-bottom: var(--space-sm);
  padding-bottom: var(--space-xs);
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}

.client-category p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.85;
}

/* ==========================================================================
   企业资质
   ========================================================================== */
.qual-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.qual-card {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  transition: all var(--transition);
}

.qual-card:hover {
  border-color: rgba(214, 0, 28, 0.3);
  box-shadow: var(--shadow-md);
}

.qual-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  font-size: 1.75rem;
  background: var(--color-primary-soft);
  border-radius: 50%;
  margin-bottom: var(--space-sm);
}

.qual-card h3 {
  font-size: 1.1rem;
  color: var(--color-dark);
  margin-bottom: var(--space-sm);
}

.qual-card ul li {
  font-size: 0.9rem;
  color: var(--color-text-light);
  padding: 0.35rem 0;
  border-bottom: 1px dashed var(--color-border);
}

.qual-card ul li:last-child {
  border-bottom: none;
}

/* 厂商代理与认证资质网格 */
.vendor-block {
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.vendor-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto var(--space-xl);
}

.vendor-head h3 {
  font-size: 1.5rem;
  color: var(--color-dark);
  margin-bottom: var(--space-sm);
}

.vendor-head p {
  color: var(--color-text-light);
  font-size: 0.98rem;
}

.vendor-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-md);
}

.vendor-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.35rem;
  padding: var(--space-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-md);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.vendor-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.vendor-more {
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--color-dark);
  border: 1px dashed rgba(214, 0, 28, 0.6);
  border-left: 3px dashed rgba(214, 0, 28, 0.6);
}

.vendor-more .vendor-logo {
  color: #fff;
  font-size: 1.25rem;
}

.vendor-more .vendor-tag {
  color: rgba(255, 255, 255, 0.7);
}

.vendor-note {
  margin-top: var(--space-lg);
  text-align: center;
  font-size: 0.95rem;
  color: var(--color-muted);
}

.vendor-logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-dark);
}

.vendor-tag {
  font-size: 0.82rem;
  color: var(--color-muted);
}

/* ==========================================================================
   服务流程
   ========================================================================== */
.process-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-md);
  counter-reset: step;
}

.process-step {
  position: relative;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg) var(--space-md);
  text-align: center;
}

.process-step::after {
  content: "";
  position: absolute;
  top: 2.5rem;
  right: -1.5rem;
  width: 1.5rem;
  height: 2px;
  background: var(--color-primary);
}

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

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: #fff;
  font-size: 1rem;
  font-weight: 900;
  border-radius: 50%;
  margin-bottom: var(--space-sm);
}

.process-step h3 {
  font-size: 1.1rem;
  color: var(--color-dark);
  margin-bottom: 0.5rem;
}

.process-step p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ==========================================================================
   联系我们（新版：大图 CTA + 信息卡片，无在线咨询表单）
   ========================================================================== */
.contact {
  position: relative;
  background: linear-gradient(135deg, var(--color-dark) 0%, #050811 100%);
  color: #fff;
  overflow: hidden;
}

.contact::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 70px 70px;
  opacity: 0.6;
  pointer-events: none;
}

.contact::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -10%;
  width: 60%;
  height: 80%;
  background: radial-gradient(circle, rgba(214, 0, 28, 0.22) 0%, transparent 65%);
  z-index: 0;
  pointer-events: none;
}

.contact .container {
  position: relative;
  z-index: 1;
}

.contact-hero {
  text-align: center;
  max-width: 760px;
  margin: 0 auto var(--space-xl);
}

.contact .section-tag {
  background: rgba(214, 0, 28, 0.15);
  color: var(--color-primary-light);
}

.contact-hero .section-title {
  color: #fff;
}

.contact-lead {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.8);
  margin: var(--space-md) 0 var(--space-lg);
  line-height: 1.8;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.contact-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
  backdrop-filter: blur(6px);
}

.contact-card:hover {
  background: rgba(214, 0, 28, 0.12);
  border-color: rgba(214, 0, 28, 0.35);
  transform: translateY(-4px);
}

.contact-card .contact-icon {
  flex-shrink: 0;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  font-size: 1.3rem;
}

.contact-card strong {
  display: block;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 0.2rem;
}

.contact-card a,
.contact-card span {
  font-size: 1rem;
  color: #fff;
  font-weight: 500;
}

.contact-card a:hover {
  color: var(--color-primary-light);
}

.map-hint {
  display: inline-block;
  margin-left: 0.4rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-primary-light);
  white-space: nowrap;
}

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: 1.25rem;
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.75);
  padding-top: var(--space-xl);
}

.footer-links h4 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: var(--space-md);
}

.footer-links li {
  margin-bottom: 0.6rem;
  font-size: 0.9rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.75);
  transition: color var(--transition);
}

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

.footer-bottom {
  padding: var(--space-md) 0;
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom p {
  margin: 0.25rem 0;
}

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

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

.flush {
  opacity: 1;
  transform: none;
}

/* 进入动效（减少运动偏好适配） */
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ==========================================================================
   响应式适配
   ========================================================================== */
@media (max-width: 1024px) {
  .header-inner {
    height: 64px;
  }

  .logo {
    width: 140px;
  }

  .services-grid,
  .solutions-grid,
  .qual-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .process-steps {
    grid-template-columns: repeat(3, 1fr);
  }

  .process-step:nth-child(3)::after {
    display: none;
  }

  .coverage-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .flush-grid,
  .flush-data-grid,
  .contact-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* 移动端 / 平板导航：汉堡菜单下拉（含大屏手机横屏）
     关键修复：菜单改用 absolute 定位在 header 正下方，
     避免 iOS Safari 因 header 的 backdrop-filter 把 fixed 子元素裁剪/错位，
     导致"汉堡点开但菜单下拉不出来"的问题。 */
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-sm) var(--space-md) var(--space-md);
    background: #ffffff;
    box-shadow: var(--shadow-lg);
    border-top: 1px solid var(--color-border);
    z-index: 999;
    max-height: calc(100vh - 64px);
    overflow-y: auto;
    transform: translateY(-14px);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.28s ease, opacity 0.28s ease, visibility 0.28s ease;
  }

  .nav-menu.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-menu li {
    border-bottom: 1px solid var(--color-border);
  }

  .nav-menu a {
    display: flex;
    align-items: center;
    padding: 0.95rem 0.25rem;
    font-size: 1.05rem;
    color: var(--color-dark);
  }

  .nav-menu a::after {
    display: none;
  }

  .nav-menu .nav-cta {
    margin-top: var(--space-md);
    margin-bottom: var(--space-xs);
    text-align: center;
    justify-content: center;
  }
}

@media (max-width: 768px) {
  :root {
    --space-2xl: 4rem;
    --container-padding: 1rem;
  }

  .header-inner {
    height: 64px;
  }

  .logo {
    width: 130px;
  }

  .hero {
    padding-top: 6rem;
  }

  .hero-emblem {
    width: 104px;
    height: 104px;
  }

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .about-visual {
    order: -1;
  }

  .culture-grid {
    grid-template-columns: 1fr;
  }

  .services-grid,
  .solutions-grid,
  .clients-grid,
  .qual-grid,
  .coverage-grid,
  .flush-grid,
  .flush-data-grid,
  .flush-stats,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .flush::before {
    background-attachment: scroll;
  }

  .process-steps {
    grid-template-columns: 1fr;
  }

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

  .process-step {
    text-align: left;
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
  }

  .step-number {
    flex-shrink: 0;
    margin-bottom: 0;
  }

}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .btn {
    width: 100%;
  }

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

  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }

  .stat-number {
    font-size: 1.75rem;
  }

  .section {
    padding: var(--space-xl) 0;
  }

  .coverage-block {
    padding: var(--space-lg);
  }

  .flush {
    min-height: 480px;
  }

  .contact-card {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .contact-card .contact-icon {
    width: 40px;
    height: 40px;
  }
}

/* ==========================================================================
   动画（减少运动偏好适配）
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ==========================================================================
   合作伙伴与产品矩阵（深信服 + 多厂商生态）
   ========================================================================== */
/* ==========================================================================
   数据安全（未来主营方向）
   ========================================================================== */
.ds-lead {
  max-width: 780px;
  margin: 0 auto var(--space-xl);
  text-align: center;
  color: var(--color-text-light);
  font-size: 1.05rem;
}

.ds-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.ds-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

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

.ds-card h3 {
  font-size: 1.15rem;
  color: var(--color-dark);
  margin-bottom: var(--space-xs);
}

.ds-card h3::before {
  content: "";
  display: block;
  width: 36px;
  height: 4px;
  border-radius: 2px;
  background: var(--color-primary);
  margin-bottom: 0.8rem;
}

.ds-card p {
  color: var(--color-text-light);
  font-size: 0.95rem;
}

/* ==========================================================================
   服务保障（改进 7×24 视觉）
   ========================================================================== */
.guar-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.guar-card {
  text-align: center;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg) var(--space-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.guar-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  background: var(--color-primary-soft);
  border-radius: 50%;
}

.guar-card h3 {
  font-size: 1.1rem;
  color: var(--color-dark);
  margin-bottom: 0.5rem;
}

.guar-card p {
  color: var(--color-text-light);
  font-size: 0.92rem;
}

/* 新模块响应式 */
@media (max-width: 1024px) {
  .nav-menu {
    gap: 1.25rem;
  }
  .nav-menu a {
    font-size: 0.9rem;
  }
  .ds-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .guar-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .ds-grid {
    grid-template-columns: 1fr;
  }
  .guar-grid {
    grid-template-columns: 1fr;
  }
}