/* =============================================
   湖南大拿科研检测技术有限公司 官网主样式
   科技风格 · 扁平化设计
   ============================================= */

:root {
  --primary: #0d6efd;
  --primary-dark: #0a58ca;
  --primary-light: #3d8bff;
  --accent: #00d4ff;
  --accent2: #7c3aed;
  --bg-dark: #050d1a;
  --bg-card: #0c1a2e;
  --bg-card2: #0f2040;
  --text-main: #e8f0fe;
  --text-secondary: #8ba3c7;
  --text-muted: #4a6080;
  --border: rgba(13, 110, 253, 0.2);
  --border-bright: rgba(13, 110, 253, 0.5);
  --glow: 0 0 20px rgba(13, 110, 253, 0.3);
  --glow-strong: 0 0 40px rgba(13, 110, 253, 0.5);
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ---- 通用辅助 ---- */
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---- 滚动条 ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--primary-dark); border-radius: 3px; }

/* =============================================
   导航栏
   ============================================= */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: 64px;
  display: flex;
  align-items: center;
  background: rgba(5, 13, 26, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
}

.nav-logo .logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: contain;
}

.nav-logo .logo-icon svg {
  width: 20px;
  height: 20px;
  fill: white;
}

.nav-logo .logo-sub {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 400;
  display: block;
  line-height: 1;
  margin-top: 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transition: transform var(--transition);
  border-radius: 1px;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-main);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  transform: scaleX(1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
}

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

.btn-primary:hover {
  background: var(--primary-light);
  box-shadow: var(--glow);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--primary-light);
  border: 1px solid var(--border-bright);
}

.btn-outline:hover {
  background: rgba(13, 110, 253, 0.1);
  border-color: var(--primary);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 8px 16px;
}

.btn-ghost:hover { color: var(--text-main); }

/* 汉堡菜单（移动端） */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 1px;
  transition: all var(--transition);
}

/* =============================================
   Hero 区域
   ============================================= */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 64px;
}

/* 网格背景 */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(13, 110, 253, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(13, 110, 253, 0.06) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

/* 光晕 */
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
}
.hero-glow-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(13, 110, 253, 0.25) 0%, transparent 70%);
  top: -100px;
  right: -100px;
}
.hero-glow-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.2) 0%, transparent 70%);
  bottom: 0;
  left: 100px;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 680px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(13, 110, 253, 0.1);
  border: 1px solid var(--border-bright);
  border-radius: 100px;
  font-size: 12px;
  color: var(--accent);
  margin-bottom: 28px;
}

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

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero h1 {
  font-size: clamp(36px, 5vw, 60px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

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

.hero p {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 40px;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn-lg {
  padding: 14px 32px;
  font-size: 16px;
  border-radius: 10px;
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 60px;
  flex-wrap: wrap;
}

.hero-stat .value {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
}

.hero-stat .value span {
  color: var(--primary-light);
}

.hero-stat .label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* =============================================
   通用 Section 样式
   ============================================= */
section {
  padding: 96px 0;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 14px;
  background: rgba(13, 110, 253, 0.1);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 12px;
  color: var(--primary-light);
  margin-bottom: 16px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.section-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-title .accent {
  color: var(--primary-light);
}

.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.8;
}

.section-header {
  margin-bottom: 56px;
}

/* =============================================
   特色功能区
   ============================================= */
.features {
  background: linear-gradient(180deg, var(--bg-dark) 0%, #080f1f 100%);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: opacity var(--transition);
}

.feature-card:hover {
  border-color: var(--border-bright);
  transform: translateY(-4px);
  box-shadow: var(--glow);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 24px;
}

.icon-blue { background: rgba(13, 110, 253, 0.15); }
.icon-cyan { background: rgba(0, 212, 255, 0.12); }
.icon-purple { background: rgba(124, 58, 237, 0.15); }
.icon-green { background: rgba(16, 185, 129, 0.12); }

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* =============================================
   业务领域区
   ============================================= */
.domains {
  background: #080f1f;
}

.domains-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.domain-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.domain-card::after {
  content: '';
  position: absolute;
  bottom: -60px;
  right: -60px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(13,110,253,0.1) 0%, transparent 70%);
  transition: all var(--transition);
}

.domain-card:hover {
  border-color: var(--border-bright);
  box-shadow: var(--glow);
  transform: translateY(-4px);
}

.domain-card:hover::after {
  transform: scale(1.5);
  opacity: 1.5;
}

.domain-num {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.domain-card h3 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 6px;
}

.domain-card .domain-en {
  font-size: 13px;
  color: var(--primary-light);
  letter-spacing: 2px;
  margin-bottom: 20px;
}

.domain-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
}

.domain-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.domain-tag {
  padding: 4px 12px;
  background: rgba(13, 110, 253, 0.1);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 12px;
  color: var(--text-secondary);
}

/* =============================================
   平台流程区
   ============================================= */
.process {
  background: linear-gradient(180deg, #080f1f 0%, var(--bg-dark) 100%);
}

/* Tab 切换 */
.process-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 48px;
}

.process-tab {
  padding: 10px 28px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  transition: all var(--transition);
  font-family: inherit;
}

.process-tab:hover {
  border-color: var(--border-bright);
  color: var(--text-main);
}

.process-tab.active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
  box-shadow: var(--glow);
}

/* 面板切换 */
.process-panel {
  display: none;
}

.process-panel.active {
  display: block;
  animation: fadeInUp 0.4s ease both;
}

/* 锯齿路径 */
.zigzag {
  position: relative;
  max-width: 680px;
  margin: 0 auto;
  padding: 8px 0;
}

/* 中轴连接线 */
.zigzag::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
  transform: translateX(-50%);
}

.zigzag-item {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 48%;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 16px;
  position: relative;
  transition: all var(--transition);
}

/* 左侧项 */
.zigzag-item.left {
  margin-right: auto;
  margin-left: 0;
}

/* 右侧项 */
.zigzag-item.right {
  margin-left: auto;
  margin-right: 0;
}

/* 连接轴的小圆点 */
.zigzag-item::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 10px;
  height: 10px;
  background: var(--primary);
  border-radius: 50%;
  transform: translateY(-50%);
  box-shadow: 0 0 8px rgba(13, 110, 253, 0.4);
  transition: all var(--transition);
}

.zigzag-item.left::after {
  right: -5px;
  transform: translate(50%, -50%);
}

.zigzag-item.right::after {
  left: -5px;
  transform: translate(-50%, -50%);
}

/* hover 效果 */
.zigzag-item:hover {
  border-color: var(--border-bright);
  box-shadow: var(--glow);
  transform: translateY(-2px);
}

.zigzag-item:hover::after {
  background: var(--accent);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.6);
  transform: translate(50%, -50%) scale(1.3);
}

.zigzag-item.right:hover::after {
  transform: translate(-50%, -50%) scale(1.3);
}

.zigzag-num {
  font-size: 22px;
  font-weight: 800;
  color: var(--primary-light);
  flex-shrink: 0;
  line-height: 1;
  transition: all var(--transition);
}

.zigzag-item:hover .zigzag-num {
  color: var(--accent);
  text-shadow: 0 0 12px rgba(0, 212, 255, 0.4);
}

.zigzag-text {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.zigzag-item:hover .zigzag-text {
  color: var(--text-main);
}

/* =============================================
   关于我们
   ============================================= */
.about {
  background: #080f1f;
}

.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-visual {
  position: relative;
}

.about-chart {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  position: relative;
  overflow: hidden;
}

.about-chart::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 20%, rgba(13,110,253,0.08) 0%, transparent 60%);
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.chart-title {
  font-size: 13px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.chart-badge {
  padding: 3px 10px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: 100px;
  font-size: 11px;
  color: #10b981;
}

.chart-bars {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  height: 120px;
}

.chart-bar {
  flex: 1;
  background: linear-gradient(180deg, var(--primary-light) 0%, var(--primary-dark) 100%);
  border-radius: 4px 4px 0 0;
  opacity: 0.8;
  transition: opacity var(--transition);
  position: relative;
}

.chart-bar:hover { opacity: 1; }

.chart-labels {
  display: flex;
  gap: 10px;
  margin-top: 8px;
}

.chart-labels span {
  flex: 1;
  text-align: center;
  font-size: 11px;
  color: var(--text-muted);
}

.about-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 20px;
}

.metric-item {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.metric-value {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary-light);
  line-height: 1;
}

.metric-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
}

.about-text .section-desc {
  max-width: none;
  margin-bottom: 24px;
}

.about-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.about-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 14px;
  color: var(--text-secondary);
}

.about-list li .check {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(13, 110, 253, 0.15);
  border: 1px solid var(--border-bright);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
  font-size: 11px;
  color: var(--primary-light);
}

/* =============================================
   联系我们
   ============================================= */
.contact {
  background: var(--bg-dark);
}

.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 60px;
  align-items: start;
}

.contact-info h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
}

.contact-info .sub {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 36px;
}

.contact-items {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 14px;
}

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(13, 110, 253, 0.1);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.contact-item .ci-label {
  font-size: 12px;
  color: var(--text-muted);
}

.contact-item .ci-value {
  font-size: 15px;
  color: var(--text-main);
  font-weight: 500;
}

/* 表单 */
.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
}

.contact-form h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 24px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

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

.form-group input,
.form-group textarea,
.form-group select {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 14px;
  color: var(--text-main);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(13,110,253,0.15);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.form-group select option {
  background: var(--bg-card2);
  color: var(--text-main);
}

.form-submit {
  width: 100%;
  padding: 12px;
  font-size: 15px;
}

.form-success {
  display: none;
  text-align: center;
  padding: 20px;
  color: #10b981;
  font-size: 15px;
}

/* =============================================
   页脚
   ============================================= */
.footer {
  background: #030a14;
  border-top: 1px solid var(--border);
  padding: 60px 0 32px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand .nav-logo { margin-bottom: 14px; }

.footer-brand p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.8;
  max-width: 280px;
}

.footer-col h5 {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

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

.footer-links a {
  font-size: 13px;
  color: var(--text-muted);
  transition: color var(--transition);
}

.footer-links a:hover { color: var(--text-main); }

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  font-size: 12px;
  color: var(--text-muted);
}

.footer-icp a {
  color: var(--text-muted);
  font-size: 12px;
  transition: color var(--transition);
}

.footer-icp a:hover { color: var(--primary-light); }

/* =============================================
   后台登录页
   ============================================= */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-dark);
  position: relative;
  overflow: hidden;
}

.login-page::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(13, 110, 253, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(13, 110, 253, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
}

.login-box {
  position: relative;
  z-index: 1;
  width: 400px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
}

.login-logo {
  text-align: center;
  margin-bottom: 32px;
}

.login-logo .logo-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  object-fit: contain;
  margin: 0 auto 12px;
}

.login-logo .logo-icon svg {
  width: 28px;
  height: 28px;
  fill: white;
}

.login-logo h1 {
  font-size: 20px;
  font-weight: 700;
}

.login-logo p {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

.login-form .form-group { margin-bottom: 20px; }

.login-form .form-group label {
  font-size: 13px;
  color: var(--text-secondary);
  display: block;
  margin-bottom: 8px;
}

.login-form input {
  width: 100%;
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 14px;
  color: var(--text-main);
  outline: none;
  transition: all var(--transition);
  font-family: inherit;
}

.login-form input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(13,110,253,0.15);
}

.login-btn {
  width: 100%;
  padding: 13px;
  font-size: 15px;
  border-radius: 8px;
  margin-top: 8px;
}

.login-error {
  color: #ef4444;
  font-size: 13px;
  text-align: center;
  margin-top: 12px;
  display: none;
}

/* =============================================
   后台面板
   ============================================= */
.admin-layout {
  display: flex;
  min-height: 100vh;
}

.admin-sidebar {
  width: 240px;
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
}

.sidebar-header {
  padding: 24px 20px;
  border-bottom: 1px solid var(--border);
}

.sidebar-nav {
  flex: 1;
  padding: 16px 0;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  font-size: 14px;
  color: var(--text-secondary);
  transition: all var(--transition);
  border-left: 3px solid transparent;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
  color: var(--text-main);
  background: rgba(13,110,253,0.08);
  border-left-color: var(--primary);
}

.sidebar-nav .nav-section {
  font-size: 11px;
  color: var(--text-muted);
  padding: 16px 20px 6px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.admin-main {
  margin-left: 240px;
  flex: 1;
  padding: 32px;
  min-height: 100vh;
}

.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
}

.admin-header h2 {
  font-size: 22px;
  font-weight: 700;
}

.admin-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.admin-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
}

.admin-card .card-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.admin-card .card-value {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-main);
}

.admin-card .card-sub {
  font-size: 12px;
  color: #10b981;
  margin-top: 4px;
}

.admin-table {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.admin-table table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.admin-table th {
  background: var(--bg-card2);
  padding: 12px 16px;
  text-align: left;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.admin-table td {
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
}

.admin-table tr:hover td { background: rgba(13,110,253,0.03); }

.badge {
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 600;
}

.badge-new { background: rgba(13,110,253,0.15); color: var(--primary-light); }
.badge-replied { background: rgba(16,185,129,0.12); color: #10b981; }
.badge-pending { background: rgba(245,158,11,0.12); color: #f59e0b; }

/* =============================================
   响应式
   ============================================= */
@media (max-width: 900px) {
  .domains-grid { grid-template-columns: 1fr; }
  .about-inner { grid-template-columns: 1fr; gap: 40px; }
  .contact-inner { grid-template-columns: 1fr; gap: 40px; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .process-tabs { flex-wrap: wrap; }
  .zigzag { max-width: 100%; }
  .zigzag-item { width: 46%; padding: 14px 16px; }
  .zigzag-num { font-size: 18px; }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions .btn-outline { display: none; }
  .hamburger { display: flex; }
  .hero h1 { font-size: 32px; }
  .admin-cards { grid-template-columns: 1fr 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .about-metrics { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  section { padding: 64px 0; }
  .hero-stats { gap: 24px; }
  .admin-cards { grid-template-columns: 1fr; }
  .process-tab { padding: 8px 18px; font-size: 12px; }
  .zigzag::before { left: 16px; }
  .zigzag-item,
  .zigzag-item.left,
  .zigzag-item.right {
    width: calc(100% - 36px);
    margin-left: 36px;
    margin-right: 0;
  }
  .zigzag-item.left::after,
  .zigzag-item.right::after {
    left: -5px;
    right: auto;
    transform: translate(-50%, -50%);
  }
  .zigzag-item.left:hover::after,
  .zigzag-item.right:hover::after {
    transform: translate(-50%, -50%) scale(1.3);
  }
}

/* =============================================
   动画
   ============================================= */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-in {
  animation: fadeInUp 0.6s ease both;
}

[data-aos] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].visible {
  opacity: 1;
  transform: translateY(0);
}

/* 通知 Toast */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  padding: 14px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-bright);
  border-radius: 10px;
  font-size: 14px;
  color: var(--text-main);
  box-shadow: var(--glow);
  z-index: 9999;
  transform: translateY(80px);
  opacity: 0;
  transition: all 0.3s ease;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast.success { border-color: rgba(16,185,129,0.5); }
.toast.error { border-color: rgba(239,68,68,0.5); }