/* ============================================
   佳康赛尔企业官网 - 全局样式系统
   版本: V1.0 | 日期: 2026-05
   设计依据: 《佳康赛尔企业官网建设策书_V2》
   ============================================ */

/* ========== CSS变量 / 设计令牌 ========== */
:root {
  /* 色彩系统 */
  --color-primary: #002060;       /* 深海蓝 - 主色 */
  --color-secondary: #0548BB;     /* 科技蓝 - 辅色 */
  --color-accent: #0678CE;        /* 中蓝 - 强调/交互 */
  --color-highlight: #2FB7EB;     /* 天蓝 - 高亮/进度 */
  --color-cta: #EA5520;           /* 活力橙 - CTA按钮 */
  --color-cta-hover: #C74618;     /* CTA悬停 */
  --color-white: #FFFFFF;
  --color-bg-light: #EBF3FB;      /* 浅蓝灰辅助背景 */
  --color-bg-gray: #F5F7FA;
  --color-text: #1B1B1B;          /* 正文深灰 */
  --color-text-secondary: #666666; /* 辅助文字 */
  --color-text-light: #999999;
  --color-border: #E0E6ED;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  
  /* 字体系统 */
  --font-cn: 'Microsoft YaHei', '微软雅黑', 'PingFang SC', sans-serif;
  --font-en-heading: 'Montserrat', 'Arial', sans-serif;
  --font-en-body: 'Open Sans', 'Segoe UI', sans-serif;
  
  --fs-xs: 0.75rem;    /* 12px */
  --fs-sm: 0.875rem;   /* 14px */
  --fs-base: 1rem;     /* 16px */
  --fs-lg: 1.125rem;   /* 18px */
  --fs-xl: 1.25rem;    /* 20px */
  --fs-2xl: 1.5rem;    /* 24px */
  --fs-3xl: 1.875rem;  /* 30px */
  --fs-4xl: 2.25rem;   /* 36px */
  --fs-5xl: 3rem;      /* 48px */
  
  /* 间距系统 (基于4px) */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
  
  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
  
  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  
  /* 过渡 */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
  
  /* 容器 */
  --container-max: 1280px;
  --header-height: 72px;
}

/* ========== Reset & Base ========== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-cn);
  font-size: var(--fs-base);
  color: var(--color-text);
  line-height: 1.75;
  background: var(--color-white);
  overflow-x: hidden;
}

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

a:hover {
  color: var(--color-secondary);
}

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

ul, ol {
  list-style: none;
}

/* ========== Container ========== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-sm {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ========== 头部导航 ========== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  z-index: 1000;
  transition: all var(--transition-normal);
}

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

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.header-logo {
  height: 44px;
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.header-logo img {
  height: 100%;
  width: auto;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.header-nav > li {
  position: relative;
}

.header-nav > li > a {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--fs-sm);
  color: var(--color-text);
  font-weight: 500;
  white-space: nowrap;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.header-nav > li > a:hover,
.header-nav > li.active > a {
  color: var(--color-accent);
  background: var(--color-bg-light);
}

/* 下拉菜单 */
.header-nav .dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  min-width: 180px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
}

.header-nav > li:hover .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(4px);
}

.header-nav .dropdown a {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: all var(--transition-fast);
}

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

/* 移动端菜单按钮 */
.header-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.header-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition-normal);
}

/* ========== 页面标题区 ========== */
.page-hero {
  padding-top: calc(var(--header-height) + var(--space-16));
  padding-bottom: var(--space-12);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  text-align: center;
  color: var(--color-white);
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(circle at 20% 50%, rgba(47,183,235,0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(5,72,187,0.2) 0%, transparent 50%);
  pointer-events: none;
}

.page-hero h1 {
  font-size: var(--fs-4xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
  position: relative;
}

.page-hero .subtitle {
  font-size: var(--fs-lg);
  color: rgba(255,255,255,0.8);
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-sm);
  color: rgba(255,255,255,0.7);
  margin-bottom: var(--space-6);
  position: relative;
}

.breadcrumb a {
  color: rgba(255,255,255,0.7);
}

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

.breadcrumb .sep {
  opacity: 0.5;
}

/* ========== 板块标题 ========== */
.section {
  padding: var(--space-20) 0;
}

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

.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-header .label {
  display: inline-block;
  font-size: var(--fs-sm);
  color: var(--color-accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: var(--space-2);
}

.section-header h2 {
  font-size: var(--fs-3xl);
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.section-header p {
  font-size: var(--fs-lg);
  color: var(--color-text-secondary);
  max-width: 700px;
  margin: 0 auto;
}

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

.section-header.left p {
  margin: 0;
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 12px 28px;
  font-size: var(--fs-base);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  font-family: inherit;
}

.btn-primary {
  background: var(--color-cta);
  color: var(--color-white);
  border-color: var(--color-cta);
}

.btn-primary:hover {
  background: var(--color-cta-hover);
  border-color: var(--color-cta-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  color: var(--color-white);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,0.4);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--color-white);
  color: var(--color-white);
}

.btn-outline-blue {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn-outline-blue:hover {
  background: var(--color-accent);
  color: var(--color-white);
}

.btn-lg {
  padding: 16px 36px;
  font-size: var(--fs-lg);
}

.btn-sm {
  padding: 8px 20px;
  font-size: var(--fs-sm);
}

/* ========== 卡片 ========== */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-body {
  padding: var(--space-6);
}

/* ========== 首页Banner ========== */
.hero-banner {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #001540 0%, #002060 40%, #0548BB 100%);
  z-index: 0;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(47,183,235,0.1) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 80%, rgba(5,72,187,0.15) 0%, transparent 60%);
  animation: heroPulse 8s ease-in-out infinite alternate;
}

@keyframes heroPulse {
  0% { opacity: 0.6; }
  100% { opacity: 1; }
}

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

.hero-content {
  position: relative;
  z-index: 2;
  color: var(--color-white);
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.hero-content h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-6);
  letter-spacing: -0.02em;
}

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

.hero-content .hero-subtitle {
  font-size: var(--fs-xl);
  color: rgba(255,255,255,0.85);
  line-height: 1.7;
  margin-bottom: var(--space-8);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

.hero-scroll {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: rgba(255,255,255,0.6);
  font-size: var(--fs-xs);
  cursor: pointer;
  animation: scrollBounce 2s ease-in-out infinite;
}

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

.hero-scroll .arrow {
  width: 24px;
  height: 24px;
  border-right: 2px solid rgba(255,255,255,0.6);
  border-bottom: 2px solid rgba(255,255,255,0.6);
  transform: rotate(45deg);
}

/* ========== 数据卡片 ========== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-6);
}

.stat-card {
  text-align: center;
  padding: var(--space-6) var(--space-4);
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  border-color: var(--color-accent);
}

.stat-number {
  font-size: var(--fs-4xl);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: var(--space-2);
}

.stat-number .unit {
  font-size: var(--fs-lg);
  font-weight: 500;
  color: var(--color-text-secondary);
}

.stat-label {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
}

/* ========== 两栏布局 ========== */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
  align-items: center;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

/* ========== 业务板块卡片 ========== */
.biz-card {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 16/10;
  display: flex;
  align-items: flex-end;
  padding: var(--space-8);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.biz-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,32,96,0.85) 0%, rgba(0,32,96,0.2) 50%, rgba(0,32,96,0.05) 100%);
  z-index: 1;
  transition: all var(--transition-normal);
}

.biz-card:hover::before {
  background: linear-gradient(to top, rgba(0,32,96,0.92) 0%, rgba(0,32,96,0.3) 50%, rgba(0,32,96,0.1) 100%);
}

.biz-card .biz-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transition: transform var(--transition-slow);
  z-index: 0;
}

.biz-card:hover .biz-bg {
  transform: scale(1.05);
}

.biz-card .biz-content {
  position: relative;
  z-index: 2;
  color: var(--color-white);
}

.biz-card .biz-content h3 {
  font-size: var(--fs-2xl);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.biz-card .biz-content p {
  font-size: var(--fs-sm);
  opacity: 0.9;
  margin-bottom: var(--space-4);
}

.biz-card .biz-arrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-highlight);
  transition: gap var(--transition-fast);
}

.biz-card:hover .biz-arrow {
  gap: var(--space-4);
}

/* ========== 技术亮点 ========== */
.tech-card {
  text-align: center;
  padding: var(--space-8) var(--space-6);
}

.tech-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto var(--space-6);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--color-bg-light), rgba(5,72,187,0.1));
}

.tech-icon svg {
  width: 36px;
  height: 36px;
  color: var(--color-accent);
}

.tech-card h3 {
  font-size: var(--fs-lg);
  color: var(--color-primary);
  margin-bottom: var(--space-3);
  font-weight: 600;
}

.tech-card p {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ========== 合作伙伴Logo墙 ========== */
.partner-grid {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-12);
  flex-wrap: wrap;
}

.partner-item {
  text-align: center;
  padding: var(--space-6);
  transition: all var(--transition-normal);
  opacity: 0.7;
}

.partner-item:hover {
  opacity: 1;
  transform: translateY(-2px);
}

.partner-item .partner-logo-placeholder {
  width: 120px;
  height: 60px;
  margin: 0 auto var(--space-3);
  background: var(--color-bg-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  font-weight: 600;
}

.partner-item .partner-name {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* ========== 新闻卡片 ========== */
.news-card {
  display: flex;
  flex-direction: column;
}

.news-card .news-img {
  width: 100%;
  aspect-ratio: 16/10;
  background: linear-gradient(135deg, var(--color-bg-light), #d0dff5);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: var(--fs-sm);
}

.news-card .news-body {
  padding: var(--space-6);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.news-card .news-tag {
  display: inline-block;
  padding: 2px 12px;
  font-size: var(--fs-xs);
  color: var(--color-accent);
  background: var(--color-bg-light);
  border-radius: var(--radius-full);
  font-weight: 500;
  margin-bottom: var(--space-3);
  width: fit-content;
}

.news-card .news-date {
  font-size: var(--fs-xs);
  color: var(--color-text-light);
  margin-bottom: var(--space-2);
}

.news-card h3 {
  font-size: var(--fs-lg);
  color: var(--color-text);
  font-weight: 600;
  margin-bottom: var(--space-3);
  line-height: 1.4;
}

.news-card p {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  flex: 1;
}

/* ========== CTA区块 ========== */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  padding: var(--space-16) 0;
  text-align: center;
  color: var(--color-white);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 50%, rgba(47,183,235,0.1), transparent 60%);
}

.cta-section h2 {
  font-size: var(--fs-3xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
  position: relative;
}

.cta-section p {
  font-size: var(--fs-lg);
  color: rgba(255,255,255,0.85);
  margin-bottom: var(--space-8);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}

/* ========== 页脚 ========== */
.footer {
  background: #001540;
  color: rgba(255,255,255,0.7);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

.footer h4 {
  color: var(--color-white);
  font-size: var(--fs-base);
  font-weight: 600;
  margin-bottom: var(--space-6);
}

.footer p {
  font-size: var(--fs-sm);
  line-height: 1.8;
  margin-bottom: var(--space-4);
}

.footer a {
  color: rgba(255,255,255,0.6);
  font-size: var(--fs-sm);
  transition: color var(--transition-fast);
  display: block;
  padding: var(--space-1) 0;
}

.footer a:hover {
  color: var(--color-highlight);
}

.footer-links li + li {
  margin-top: var(--space-1);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--space-8);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: var(--fs-xs);
}

/* ========== 企业介绍 ========== */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}

.about-intro .about-text h2 {
  font-size: var(--fs-3xl);
  color: var(--color-primary);
  margin-bottom: var(--space-6);
  font-weight: 700;
}

.about-intro .about-text p {
  color: var(--color-text-secondary);
  line-height: 1.9;
  margin-bottom: var(--space-4);
}

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

}

.about-image .placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, var(--color-bg-light), #c8ddf8);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  color: var(--color-text-secondary);
  font-size: var(--fs-sm);
}

.about-image .placeholder .icon {
  font-size: 48px;
  margin-bottom: var(--space-3);
  opacity: 0.5;
}

/* ========== 企业文化六宫格 ========== */
.culture-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  max-width: 900px;
  margin: 0 auto;
}

.culture-item {
  text-align: center;
  padding: var(--space-8) var(--space-6);
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

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

.culture-item .culture-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--space-4);
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-bg-light), rgba(5,72,187,0.1));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--color-accent);
}

.culture-item h3 {
  font-size: var(--fs-xl);
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.culture-item p {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ========== 使命愿景区块 ========== */
.mission-block {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: var(--color-white);
  padding: var(--space-12);
  border-radius: var(--radius-xl);
  text-align: center;
  margin-bottom: var(--space-8);
}

.mission-block .quote {
  font-size: var(--fs-2xl);
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: var(--space-4);
  quotes: "「" "」";
}

.mission-block .quote::before { content: "「"; }
.mission-block .quote::after { content: "」"; }

.mission-block .desc {
  font-size: var(--fs-base);
  opacity: 0.85;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ========== 发展历程时间轴 ========== */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-4) 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 220px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-highlight));
  border-radius: var(--radius-full);
}

.timeline-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
  position: relative;
}

.timeline-item .time {
  width: 200px;
  text-align: right;
  font-weight: 700;
  color: var(--color-primary);
  font-size: var(--fs-lg);
  flex-shrink: 0;
  padding-top: var(--space-1);
}

.timeline-item .dot {
  position: absolute;
  left: 216px;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--color-accent);
  border: 3px solid var(--color-white);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
}

.timeline-item .content {
  flex: 1;
  padding-left: var(--space-8);
}

.timeline-item .content h3 {
  font-size: var(--fs-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.timeline-item .content p {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
}

/* ========== 资质荣誉 ========== */
.honor-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.honor-card {
  text-align: center;
  padding: var(--space-8);
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.honor-card .honor-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-4);
  background: var(--color-bg-light);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-2xl);
  color: var(--color-accent);
}

.honor-card h3 {
  font-size: var(--fs-base);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.honor-card p {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
}

/* ========== 科研实力详情页 ========== */
.tech-detail {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-12);
  align-items: center;
  margin-bottom: var(--space-16);
}

.tech-detail.reverse {
  grid-template-columns: 2fr 3fr;
}

.tech-detail .tech-info h2 {
  font-size: var(--fs-2xl);
  color: var(--color-primary);
  margin-bottom: var(--space-4);
  font-weight: 700;
}

.tech-detail .tech-info p {
  color: var(--color-text-secondary);
  line-height: 1.9;
  margin-bottom: var(--space-3);
}

.tech-highlights {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.tech-highlight-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.tech-highlight-item .check {
  width: 24px;
  height: 24px;
  background: var(--color-success);
  color: var(--color-white);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-xs);
  flex-shrink: 0;
  margin-top: 2px;
}

.tech-highlight-item span {
  font-size: var(--fs-sm);
  color: var(--color-text);
}

/* ========== 联系表单 ========== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
}

.contact-info .contact-item {
  display: flex;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.contact-item .contact-icon {
  width: 48px;
  height: 48px;
  background: var(--color-bg-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-accent);
  font-size: var(--fs-xl);
}

.contact-item h3 {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-1);
}

.contact-item p {
  font-size: var(--fs-base);
  color: var(--color-text);
  font-weight: 500;
}

.contact-form {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

.contact-form h3 {
  font-size: var(--fs-xl);
  color: var(--color-primary);
  margin-bottom: var(--space-6);
  font-weight: 600;
}

.form-group {
  margin-bottom: var(--space-4);
}

.form-group label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--fs-base);
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-white);
  transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(6,120,206,0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* ========== 新闻列表 ========== */
.news-filters {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
}

.news-filter-btn {
  padding: 8px 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  background: var(--color-white);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
}

.news-filter-btn:hover,
.news-filter-btn.active {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.news-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

/* ========== 新闻详情 ========== */
.article {
  max-width: 800px;
  margin: 0 auto;
}

.article .article-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
}

.article .article-meta .tag {
  padding: 2px 10px;
  background: var(--color-bg-light);
  color: var(--color-accent);
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
}

.article .article-body {
  font-size: var(--fs-base);
  line-height: 1.9;
  color: var(--color-text);
}

.article .article-body p {
  margin-bottom: var(--space-4);
}

.article-nav {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  font-size: var(--fs-sm);
}

/* ========== 专家团队卡片 ========== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.expert-card {
  text-align: center;
  padding: var(--space-8);
}

.expert-card .expert-avatar {
  width: 420px;
  height: 420px;
  border-radius: var(--radius-full);
  margin: 0 auto var(--space-6);
  background: linear-gradient(135deg, var(--color-bg-light), #c8ddf8);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-2xl);
  color: var(--color-accent);
  overflow: hidden;
}

.expert-card h3 {
  font-size: var(--fs-lg);
  color: var(--color-text);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.expert-card .title {
  font-size: var(--fs-sm);
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: var(--space-2);
}

.expert-card .org {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
}

.expert-card .expert-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
}

.expert-tag {
  font-size: var(--fs-xs);
  padding: 2px 10px;
  background: var(--color-bg-light);
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
}

/* ========== 流程图 ========== */
.process-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin: var(--space-8) 0;
}

.process-step {
  padding: var(--space-4) var(--space-6);
  background: var(--color-white);
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-md);
  text-align: center;
  font-weight: 600;
  font-size: var(--fs-sm);
  color: var(--color-primary);
  min-width: 100px;
}

.process-arrow {
  font-size: var(--fs-xl);
  color: var(--color-accent);
}

/* ========== 双轨流程图 ========== */
.dual-track {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-8);
  align-items: start;
  margin: var(--space-8) 0;
}

.dual-track .track {
  padding: var(--space-8);
  border-radius: var(--radius-lg);
}

.dual-track .track.iit {
  background: linear-gradient(135deg, var(--color-bg-light), #e3f0fc);
  border: 2px solid var(--color-accent);
}

.dual-track .track.ind {
  background: linear-gradient(135deg, #fff3e0, #ffe0b2);
  border: 2px solid var(--color-cta);
}

.dual-track .divider {
  width: 2px;
  background: var(--color-border);
  align-self: stretch;
  border-radius: var(--radius-full);
}

/* ========== 动画 ========== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== 响应式设计 ========== */
@media (max-width: 1024px) {
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .grid-2, .about-intro, .contact-grid { grid-template-columns: 1fr; }
  .tech-detail, .tech-detail.reverse { grid-template-columns: 1fr; gap: var(--space-8); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .dual-track { grid-template-columns: 1fr; }
  .dual-track .divider { display: none; }
  .expert-grid, .news-list { grid-template-columns: repeat(2, 1fr); }
  .honor-grid { grid-template-columns: repeat(2, 1fr); }
  .culture-grid { grid-template-columns: repeat(2, 1fr); }
  .process-flow { gap: var(--space-1); }
  .process-step { padding: var(--space-3) var(--space-4); }
  .timeline::before { left: 80px; }
  .timeline-item .time { width: 80px; font-size: var(--fs-sm); }
  .timeline-item .dot { left: 76px; }
}

@media (max-width: 768px) {
  :root { --header-height: 60px; }
  
  .header-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: var(--color-white);
    flex-direction: column;
    padding: var(--space-4);
    box-shadow: var(--shadow-lg);
    transform: translateY(-120%);
    transition: transform var(--transition-normal);
    gap: var(--space-1);
  }
  
  .header-nav.open {
    transform: translateY(0);
  }
  
  .header-nav .dropdown {
    position: static;
    transform: none;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    padding-left: var(--space-4);
  }
  
  .header-toggle { display: flex; }
  
  .hero-content h1 { font-size: 1.75rem; }
  .hero-content .hero-subtitle { font-size: var(--fs-base); }
  .hero-buttons { flex-direction: column; align-items: center; }
  
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-3); }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
  
  .section { padding: var(--space-12) 0; }
  .section-header h2 { font-size: var(--fs-2xl); }
  
  .page-hero { padding: calc(var(--header-height) + var(--space-8)) 0 var(--space-8); }
  .page-hero h1 { font-size: var(--fs-2xl); }
  
  .culture-grid { grid-template-columns: 1fr 1fr; }
  .expert-grid, .news-list { grid-template-columns: 1fr; }
  .honor-grid { grid-template-columns: 1fr; }
  .partner-grid { gap: var(--space-6); }
  
  .timeline::before { left: 20px; }
  .timeline-item { flex-direction: column; gap: var(--space-2); }
  .timeline-item .time { width: auto; text-align: left; padding-left: 40px; }
  .timeline-item .dot { left: 16px; }
  .timeline-item .content { padding-left: 40px; }
  
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  
  .mission-block { padding: var(--space-8); }
  .mission-block .quote { font-size: var(--fs-xl); }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .culture-grid { grid-template-columns: 1fr; }
}