/* ================================================
   郑州助推生物科技有限公司 - 企业官网样式
   主题：清新自然绿色系
   ================================================ */

:root {
  --primary: #2e7d32;        /* 深绿 主色 */
  --primary-light: #4caf50;  /* 中绿 */
  --primary-pale: #e8f5e9;   /* 浅绿背景 */
  --accent: #8bc34a;         /* 草绿强调色 */
  --gold: #f9a825;           /* 金黄点缀 */
  --dark: #1b2e1e;           /* 深色文字 */
  --gray: #6c757d;
  --light-gray: #f5f7f5;
  --white: #ffffff;
  --border: #dcedc8;
  --shadow: 0 4px 20px rgba(46,125,50,0.12);
  --shadow-hover: 0 8px 30px rgba(46,125,50,0.22);
  --radius: 10px;
  --radius-lg: 18px;
  --transition: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Microsoft YaHei', '微软雅黑', 'PingFang SC', Arial, sans-serif;
  color: var(--dark);
  line-height: 1.7;
  background: var(--white);
}

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

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

/* ---- 通用布局 ---- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 80px 0;
}

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

.section-title {
  text-align: center;
  margin-bottom: 50px;
}

.section-title h2 {
  font-size: 2rem;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
  margin: 10px auto 0;
}

.section-title p {
  color: var(--gray);
  font-size: 1.05rem;
  margin-top: 10px;
}

/* ---- 导航栏 ---- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 15px rgba(46,125,50,0.1);
  transition: var(--transition);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.navbar-logo .logo-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.4rem;
}

.navbar-logo .logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.navbar-logo .logo-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
}

.navbar-logo .logo-sub {
  font-size: 0.7rem;
  color: var(--gray);
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
  align-items: center;
}

.nav-links a {
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 0.95rem;
  color: var(--dark);
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  background: var(--primary-pale);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
}

.nav-cta {
  background: linear-gradient(135deg, var(--primary), var(--primary-light)) !important;
  color: white !important;
  padding: 8px 22px !important;
  border-radius: 20px !important;
}

.nav-cta:hover {
  background: var(--primary) !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(46,125,50,0.3);
}

/* 汉堡菜单 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}

.hamburger span {
  display: block;
  width: 25px;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---- Hero 区 ---- */
.hero {
  margin-top: 70px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #1b5e20 0%, #2e7d32 40%, #388e3c 70%, #558b2f 100%);
  min-height: 620px;
  display: flex;
  align-items: center;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
  position: relative;
  z-index: 2;
  color: white;
  max-width: 640px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  margin-bottom: 24px;
  backdrop-filter: blur(5px);
}

.hero h1 {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 20px;
  text-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.hero h1 span {
  color: var(--gold);
}

.hero p {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 36px;
  line-height: 1.8;
}

.hero-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: 30px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
}

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

.btn-primary:hover {
  background: #f57f17;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(249,168,37,0.4);
}

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

.btn-outline:hover {
  background: rgba(255,255,255,0.15);
  border-color: white;
  transform: translateY(-2px);
}

.hero-right {
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 45%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.12;
}

.hero-right svg {
  width: 100%;
  height: 100%;
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 48px;
  flex-wrap: wrap;
}

.hero-stat {
  text-align: center;
}

.hero-stat .num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--gold);
  line-height: 1;
}

.hero-stat .label {
  font-size: 0.82rem;
  opacity: 0.8;
  margin-top: 4px;
}

/* ---- 核心业务卡片 ---- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.service-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-light);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-icon {
  width: 60px;
  height: 60px;
  background: var(--primary-pale);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 20px;
  transition: var(--transition);
}

.service-card:hover .service-icon {
  background: var(--primary);
  transform: scale(1.1);
}

.service-card h3 {
  font-size: 1.2rem;
  color: var(--primary);
  margin-bottom: 12px;
  font-weight: 700;
}

.service-card p {
  color: var(--gray);
  font-size: 0.93rem;
  line-height: 1.7;
}

.service-card .read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 18px;
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 600;
  transition: var(--transition);
}

.service-card:hover .read-more {
  gap: 10px;
}

/* ---- 关于我们（首页预览）---- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-img {
  position: relative;
}

.about-img-main {
  width: 100%;
  height: 380px;
  background: linear-gradient(135deg, var(--primary-pale), var(--border));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  overflow: hidden;
  position: relative;
}

.about-img-badge {
  position: absolute;
  bottom: -20px;
  right: -20px;
  background: var(--primary);
  color: white;
  padding: 20px 24px;
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow);
}

.about-img-badge .big {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
}

.about-img-badge .small {
  font-size: 0.8rem;
  opacity: 0.85;
  margin-top: 4px;
}

.about-text h2 {
  font-size: 1.9rem;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 18px;
}

.about-text p {
  color: var(--gray);
  margin-bottom: 16px;
  line-height: 1.8;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0;
}

.about-tag {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-pale);
  color: var(--primary);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.88rem;
  font-weight: 600;
  border: 1px solid var(--border);
}

/* ---- 成功案例 ---- */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.case-card {
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.case-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.case-img {
  height: 200px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.5rem;
  position: relative;
  overflow: hidden;
}

.case-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 50%, rgba(0,0,0,0.15));
}

.case-tag {
  position: absolute;
  top: 14px;
  left: 14px;
  background: var(--gold);
  color: var(--dark);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
  z-index: 2;
}

.case-body {
  padding: 24px;
}

.case-body h3 {
  font-size: 1.1rem;
  color: var(--dark);
  margin-bottom: 10px;
  font-weight: 700;
}

.case-body p {
  color: var(--gray);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.case-meta {
  display: flex;
  gap: 16px;
  font-size: 0.83rem;
  color: var(--primary);
}

.case-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ---- 新闻列表 ---- */
.news-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.news-card {
  background: white;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--primary);
  transition: var(--transition);
}

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

.news-date {
  display: inline-block;
  background: var(--primary-pale);
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 12px;
  margin-bottom: 12px;
}

.news-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 10px;
  line-height: 1.5;
}

.news-card p {
  color: var(--gray);
  font-size: 0.88rem;
  line-height: 1.7;
}

.news-card .news-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-top: 14px;
  color: var(--primary);
  font-size: 0.88rem;
  font-weight: 600;
}

/* ---- 数据统计条 ---- */
.stats-bar {
  background: linear-gradient(135deg, var(--primary) 0%, #1b5e20 100%);
  padding: 50px 0;
  color: white;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
}

.stat-item .num {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--gold);
  line-height: 1;
}

.stat-item .unit {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--accent);
}

.stat-item .label {
  font-size: 0.9rem;
  opacity: 0.85;
  margin-top: 8px;
}

/* ---- 联系区块 ---- */
.contact-section {
  background: var(--primary-pale);
  padding: 70px 0;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 50px;
  align-items: start;
}

.contact-info h2 {
  font-size: 1.8rem;
  color: var(--primary);
  margin-bottom: 20px;
}

.contact-info p {
  color: var(--gray);
  margin-bottom: 30px;
  line-height: 1.8;
}

.contact-items {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

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

.contact-item .icon {
  width: 44px;
  height: 44px;
  background: var(--primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.contact-item .text strong {
  display: block;
  color: var(--dark);
  margin-bottom: 3px;
}

.contact-item .text span {
  color: var(--gray);
  font-size: 0.9rem;
}

.contact-form {
  background: white;
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow);
}

.contact-form h3 {
  font-size: 1.3rem;
  color: var(--primary);
  margin-bottom: 24px;
  font-weight: 700;
}

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

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 7px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 11px 16px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 0.93rem;
  color: var(--dark);
  background: var(--light-gray);
  transition: var(--transition);
  font-family: inherit;
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--primary-light);
  background: white;
  box-shadow: 0 0 0 3px rgba(76,175,80,0.12);
}

.form-group textarea {
  resize: vertical;
  min-height: 110px;
}

.btn-submit {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: 1px;
}

.btn-submit:hover {
  background: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(46,125,50,0.35);
}

/* ---- 页脚 ---- */
footer {
  background: var(--dark);
  color: rgba(255,255,255,0.8);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 50px;
}

.footer-brand .logo-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: white;
}

.footer-brand p {
  margin-top: 14px;
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(255,255,255,0.6);
}

.footer-brand .social-links {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}

.social-link {
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.1);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: var(--transition);
}

.social-link:hover {
  background: var(--primary);
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 700;
  color: white;
  margin-bottom: 18px;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  color: rgba(255,255,255,0.6);
  font-size: 0.88rem;
  transition: var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 20px 0;
  text-align: center;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.4);
}

.footer-bottom a {
  color: var(--accent);
}

/* ---- 页面头部横幅（子页面）---- */
.page-banner {
  margin-top: 70px;
  background: linear-gradient(135deg, #1b5e20 0%, #2e7d32 60%, #558b2f 100%);
  padding: 70px 0;
  text-align: center;
  color: white;
  position: relative;
  overflow: hidden;
}

.page-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Ccircle cx='20' cy='20' r='3'/%3E%3C/g%3E%3C/svg%3E");
}

.page-banner h1 {
  font-size: 2.4rem;
  font-weight: 800;
  position: relative;
}

.page-banner p {
  opacity: 0.85;
  margin-top: 12px;
  font-size: 1.05rem;
  position: relative;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
  margin-top: 16px;
  font-size: 0.85rem;
  opacity: 0.75;
  position: relative;
}

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

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .services-grid,
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .hero h1 { font-size: 2rem; }
  .services-grid,
  .cases-grid,
  .news-list { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 50px 0; }
  .hero { min-height: 480px; }
}

/* ---- 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);
}

/* ---- 回到顶部 ---- */
.back-top {
  position: fixed;
  right: 28px;
  bottom: 28px;
  width: 46px;
  height: 46px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  cursor: pointer;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 999;
}

.back-top.show {
  opacity: 1;
  transform: translateY(0);
}

.back-top:hover {
  background: var(--primary-light);
  transform: translateY(-3px);
}

/* ---- 通知弹窗 ---- */
.toast {
  position: fixed;
  top: 90px;
  right: 20px;
  background: var(--primary);
  color: white;
  padding: 14px 22px;
  border-radius: 10px;
  font-size: 0.93rem;
  box-shadow: var(--shadow-hover);
  z-index: 9999;
  opacity: 0;
  transform: translateX(60px);
  transition: var(--transition);
}

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