/* ============================================
   赛弗尼（SAFEN）企业门户 - 全局样式
   工业风设计系统
   ============================================ */

/* --- CSS 变量定义 --- */
:root {
  /* 主色 */
  --color-primary-dark: #1a1a2e;
  --color-primary: #16213e;
  --color-primary-blue: #0f3460;
  
  /* 强调色 */
  --color-accent-red: #e94560;
  --color-accent-orange: #f5a623;
  
  /* 辅助色 */
  --color-carbon: #2d2d2d;
  --color-steel: #4a4a4a;
  --color-light-gray: #f0f0f0;
  --color-white: #ffffff;
  
  /* 字体 */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
  --font-weight-heavy: 900;
  
  /* 间距 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 40px;
  --spacing-2xl: 64px;
  --spacing-3xl: 100px;
  
  /* 阴影 */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.25);
  
  /* 圆角 */
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  
  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* 导航栏高度 */
  --header-height: 80px;
  
  /* 容器宽度 */
  --container-width: 1200px;
}

/* --- Reset / Normalize --- */
*,
*::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-family);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--color-carbon);
  background-color: var(--color-white);
  overflow-x: hidden;
}

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

a:hover {
  color: var(--color-accent-red);
}

ul, ol {
  list-style: none;
}

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

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* --- 排版系统 --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  color: var(--color-primary-dark);
}

h1 {
  font-size: 2.5rem;
  font-weight: var(--font-weight-heavy);
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2rem;
  font-weight: var(--font-weight-heavy);
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.1rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: 1em;
  color: var(--color-steel);
}

/* --- 容器 --- */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* --- 顶部导航栏 --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  display: flex;
  align-items: center;
  background: rgba(26, 26, 46, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background var(--transition-normal), box-shadow var(--transition-normal);
}

.header.scrolled {
  background: rgba(26, 26, 46, 0.98);
  box-shadow: var(--shadow-lg);
}

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

.header-logo {
  flex-shrink: 0;
}

.header-logo img {
  height: 40px;
  width: auto;
}

/* --- 一级菜单 --- */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

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

.nav-menu > li > a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.95rem;
  font-weight: var(--font-weight-medium);
  white-space: nowrap;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-menu > li > a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--color-accent-red);
  transition: width var(--transition-normal);
}

.nav-menu > li > a:hover,
.nav-menu > li.active > a {
  color: #ffffff;
}

.nav-menu > li > a:hover::after,
.nav-menu > li.active > a::after {
  width: 70%;
}

/* --- 二级下拉菜单 --- */
.nav-submenu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  min-width: 180px;
  background: var(--color-primary-dark);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-top: 2px solid var(--color-accent-red);
  padding: var(--spacing-sm) 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), transform var(--transition-normal), visibility var(--transition-normal);
  box-shadow: var(--shadow-xl);
}

.nav-submenu::before {
  content: '';
  position: absolute;
  top: -12px;
  left: 0;
  right: 0;
  height: 12px;
}

.nav-menu > li:hover > .nav-submenu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-submenu li a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-lg);
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.nav-submenu li a:hover {
  color: #ffffff;
  background: rgba(233, 69, 96, 0.1);
  padding-left: calc(var(--spacing-lg) + 4px);
}

/* --- 移动端汉堡菜单按钮 --- */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px 0;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: #ffffff;
  border-radius: 2px;
  transition: all var(--transition-normal);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* --- 底部 Footer --- */
.footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--spacing-2xl) 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  align-items: flex-start;
}

.footer-brand img {
  height: 36px;
  width: auto;
  object-fit: contain;
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9rem;
  line-height: 1.8;
}

.footer-nav h4 {
  color: #ffffff;
  font-size: 1rem;
  margin-bottom: var(--spacing-md);
  position: relative;
  padding-bottom: var(--spacing-sm);
}

.footer-nav h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--color-accent-red);
}

.footer-nav ul li {
  margin-bottom: var(--spacing-sm);
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
}

.footer-nav ul li a {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-nav ul li a:hover {
  color: var(--color-accent-orange);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg) 0;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.4);
}

/* --- 按钮系统 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-normal);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--color-accent-red);
  color: #ffffff;
  border: 2px solid var(--color-accent-red);
}

.btn-primary:hover {
  background: #d63851;
  border-color: #d63851;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(233, 69, 96, 0.35);
  color: #ffffff;
}

.btn-outline {
  background: transparent;
  color: #ffffff;
  border: 2px solid rgba(255, 255, 255, 0.6);
}

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

.btn-outline-dark {
  background: transparent;
  color: var(--color-primary-dark);
  border: 2px solid var(--color-primary-dark);
}

.btn-outline-dark:hover {
  background: var(--color-primary-dark);
  color: #ffffff;
  transform: translateY(-2px);
}

/* --- 通用内容区块 --- */
.section {
  padding: var(--spacing-3xl) 0;
  position: relative;
}

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

.section-dark {
  background: var(--color-primary-dark);
  color: #ffffff;
}

.section-dark p {
  color: rgba(255, 255, 255, 0.7);
}

.section-dark h2,
.section-dark h3,
.section-dark h4,
.section-dark h5,
.section-dark h6 {
  color: #ffffff;
}

/* --- 区块标题（工业风装饰线） --- */
.section-title {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  position: relative;
}

.section-title h2 {
  display: inline-block;
  position: relative;
  padding-bottom: var(--spacing-md);
}

.section-title h2::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--color-accent-red);
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 12px;
  height: 5px;
  background: var(--color-accent-orange);
}

.section-title p {
  margin-top: var(--spacing-md);
  color: var(--color-steel);
  font-size: 1.05rem;
}

.section-dark .section-title p {
  color: rgba(255, 255, 255, 0.7);
}

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

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

.card-body {
  padding: var(--spacing-lg);
}

.card-title {
  font-size: 1.15rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary-dark);
}

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

/* 斜切角卡片 */
.card-cut {
  background: var(--color-white);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
  border-radius: 0;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  position: relative;
}

.card-cut::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 30px;
  height: 30px;
  background: linear-gradient(135deg, transparent 50%, rgba(233, 69, 96, 0.15) 50%);
  z-index: 1;
}

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

/* --- 内页顶部 Banner --- */
.page-banner {
  position: relative;
  height: 360px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  margin-top: var(--header-height);
}

.page-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26, 26, 46, 0.9), rgba(15, 52, 96, 0.85));
  z-index: 1;
}

.page-banner-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-banner-content {
  position: relative;
  z-index: 2;
  color: #ffffff;
}

.page-banner-content h1 {
  color: #ffffff;
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.page-banner-content .breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
}

.page-banner-content .breadcrumb a:hover {
  color: var(--color-accent-orange);
}

.page-banner-content .breadcrumb .separator {
  color: rgba(255, 255, 255, 0.3);
}

/* --- 工业风特殊元素 --- */

/* 金属渐变背景 */
.metal-gradient {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 30%, #0f3460 70%, #1a1a2e 100%);
}

.metal-gradient-light {
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 50%, #f8f9fa 100%);
}

/* 网格背景装饰 */
.grid-bg {
  position: relative;
}

.grid-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

/* 工业斜线装饰 */
.industrial-stripe {
  position: relative;
}

.industrial-stripe::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: repeating-linear-gradient(
    -45deg,
    var(--color-accent-orange),
    var(--color-accent-orange) 8px,
    var(--color-primary-dark) 8px,
    var(--color-primary-dark) 16px
  );
}

/* 管道风格分隔线 */
.pipe-divider {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin: var(--spacing-xl) 0;
}

.pipe-divider::before,
.pipe-divider::after {
  content: '';
  flex: 1;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-steel), transparent);
}

.pipe-divider .pipe-node {
  width: 12px;
  height: 12px;
  border: 2px solid var(--color-accent-red);
  border-radius: 50%;
  background: var(--color-white);
}

/* 斜切角按钮/元素辅助类 */
.clip-corner-tr {
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}

.clip-corner-bl {
  clip-path: polygon(0 0, 100% 0, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.clip-corner-both {
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

/* --- 回到顶部按钮 --- */
.back-to-top {
  position: fixed;
  bottom: 40px;
  right: 40px;
  width: 44px;
  height: 44px;
  background: var(--color-accent-red);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: #d63851;
  transform: translateY(-3px);
}

/* --- 工具类 --- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-white { color: #ffffff; }
.text-accent { color: var(--color-accent-red); }
.text-orange { color: var(--color-accent-orange); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* --- 关于我们 - 企业介绍 --- */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
}

.about-intro .section-title {
  text-align: left;
  margin-bottom: var(--spacing-lg);
}

.about-intro .section-title h2::before {
  left: 0;
  transform: none;
}

.about-intro .section-title h2::after {
  left: 24px;
  transform: none;
}

.about-desc {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--color-steel);
  margin-bottom: var(--spacing-lg);
}

.about-advantages {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.about-advantages li {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1rem;
  color: var(--color-carbon);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-light-gray);
  border-left: 3px solid var(--color-accent-red);
  transition: all var(--transition-fast);
}

.about-advantages li:hover {
  background: #fff;
  box-shadow: var(--shadow-sm);
  transform: translateX(4px);
}

.advantage-icon {
  color: var(--color-accent-red);
  font-weight: var(--font-weight-bold);
}

.about-intro-image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.about-intro-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.about-intro-image::after {
  content: '';
  position: absolute;
  bottom: -8px;
  right: -8px;
  width: 60%;
  height: 60%;
  border: 3px solid var(--color-accent-red);
  border-radius: var(--radius-lg);
  z-index: -1;
}

/* --- 关于我们 - 发展历程时间轴 --- */
.timeline {
  position: relative;
  padding: var(--spacing-xl) 0;
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}

/* 垂直管道线 */
.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--color-accent-red) 0%, var(--color-primary-blue) 50%, var(--color-accent-orange) 100%);
  transform: translateX(-50%);
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  display: flex;
  align-items: flex-start;
  margin-bottom: var(--spacing-xl);
  width: 50%;
}

/* 奇数项：左侧 */
.timeline-item:nth-child(odd) {
  align-self: flex-start;
  padding-right: var(--spacing-xl);
  text-align: right;
  margin-left: 0;
}

/* 偶数项：右侧 */
.timeline-item:nth-child(even) {
  align-self: flex-end;
  padding-left: var(--spacing-xl);
  text-align: left;
  margin-left: 50%;
}

/* 管道节点 */
.timeline-node {
  position: absolute;
  top: 8px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, #fff 30%, #ddd 100%);
  border: 3px solid var(--color-accent-red);
  box-shadow: 0 0 0 4px rgba(233, 69, 96, 0.15), var(--shadow-sm);
  z-index: 2;
}

.timeline-item:nth-child(odd) .timeline-node {
  right: -9px;
}

.timeline-item:nth-child(even) .timeline-node {
  left: -9px;
}

/* 时间轴内容卡片 */
.timeline-content {
  background: var(--color-white);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  position: relative;
  transition: all var(--transition-normal);
}

.timeline-content:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.timeline-content h4 {
  margin-bottom: var(--spacing-xs);
}

.timeline-content p {
  font-size: 0.9rem;
  margin-bottom: 0;
}

.timeline-year {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-accent-red);
  background: rgba(233, 69, 96, 0.08);
  padding: 2px 10px;
  border-radius: 12px;
  margin-bottom: var(--spacing-sm);
}

/* --- 关于我们 - 资质荣誉 --- */
.honor-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
}

.honor-card {
  padding: var(--spacing-xl) var(--spacing-lg);
  text-align: center;
  transition: all var(--transition-normal);
}

.honor-card:hover {
  transform: translateY(-6px);
}

.honor-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--spacing-md);
  color: var(--color-accent-red);
}

.honor-icon svg {
  width: 100%;
  height: 100%;
}

.honor-card h4 {
  font-size: 1.05rem;
  margin-bottom: var(--spacing-xs);
}

.honor-card p {
  font-size: 0.85rem;
  color: var(--color-steel);
  margin-bottom: 0;
}

/* --- 关于我们 - 团队 --- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.team-card {
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
}

.team-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto var(--spacing-lg);
  color: var(--color-primary-blue);
}

.team-icon svg {
  width: 100%;
  height: 100%;
}

.team-card h4 {
  margin-bottom: var(--spacing-sm);
}

.team-card p {
  font-size: 0.9rem;
  color: var(--color-steel);
  margin-bottom: 0;
}