/* =============================================
   金禾绿能官网 - 全站样式
   配色：主绿 #2E7D32 / 浅绿 #E8F5E9 / 辅助蓝 #1565C0
   ============================================= */

/* ---------- CSS变量 ---------- */
:root {
  --color-primary: #2E7D32;
  --color-primary-dark: #1B5E20;
  --color-primary-light: #4CAF50;
  --color-accent: #1565C0;
  --color-accent-light: #1976D2;
  --color-bg-light: #F5F8F5;
  --color-bg-green: #E8F5E9;
  --color-text: #333333;
  --color-text-secondary: #666666;
  --color-border: #E0E0E0;
  --color-white: #ffffff;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s ease;
  --max-width: 1200px;
  --header-height: 70px;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  color: var(--color-text);
  line-height: 1.7;
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; transition: var(--transition); }
a:hover { color: var(--color-primary); }
ul { list-style: none; }
img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea { font-family: inherit; }

/* ---------- 容器 ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- 通用区块 ---------- */
.section { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 50px; }
.section-sub {
  font-size: 13px;
  color: var(--color-primary);
  letter-spacing: 4px;
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 10px;
}
.section-title {
  font-size: 32px;
  color: var(--color-text);
  font-weight: 700;
  margin-bottom: 14px;
}
.section-desc {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
  text-align: center;
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn-outline-white {
  background: transparent;
  color: #fff;
  border-color: #fff;
}
.btn-outline-white:hover {
  background: rgba(255,255,255,0.15);
  color: #fff;
}
.btn-white {
  background: #fff;
  color: var(--color-primary);
  border-color: #fff;
}
.btn-white:hover {
  background: var(--color-bg-light);
  color: var(--color-primary-dark);
  transform: translateY(-2px);
}
.btn-block { width: 100%; }

/* =============================================
   HEADER
   ============================================= */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  height: var(--header-height);
}
.site-header.scrolled { box-shadow: 0 4px 12px rgba(0,0,0,0.15); }

.header-inner {
  display: flex;
  align-items: center;
  height: var(--header-height);
  gap: 24px;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.header-logo {
  height: 53px;
  width: auto;
  object-fit: contain;
}
.header-company-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 2px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
.nav-item {
  padding: 8px 16px;
  color: #333;
  font-size: 15px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav-item:hover, .nav-item.active {
  color: #fff;
  background: var(--color-primary);
}
.nav-cta {
  background: var(--color-primary);
  color: #fff !important;
  border: 1px solid var(--color-primary);
}
.nav-cta:hover {
  background: var(--color-primary-dark) !important;
  border-color: var(--color-primary-dark);
}

.header-hotline {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 600;
  flex-shrink: 0;
  padding: 6px 14px;
  background: var(--color-bg-green);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.header-hotline:hover {
  background: var(--color-primary);
  color: #fff;
}

.mobile-menu-btn {
  display: none;
  color: #333;
  font-size: 24px;
  padding: 6px;
  margin-left: auto;
}

/* 移动端导航 */
.mobile-nav {
  position: fixed;
  top: 0;
  right: -300px;
  width: 280px;
  height: 100vh;
  background: #fff;
  z-index: 2000;
  transition: right 0.3s ease;
  display: flex;
  flex-direction: column;
  padding: 0;
  overflow-y: auto;
  box-shadow: -4px 0 20px rgba(0,0,0,0.15);
}
.mobile-nav.open { right: 0; }
.mobile-nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 1999;
  display: none;
}
.mobile-nav-overlay.open { display: block; }

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid #eee;
}
.mobile-logo { height: 40px; }
.mobile-close-btn {
  color: #333;
  font-size: 24px;
  padding: 4px;
}
.mobile-nav-links { flex: 1; padding: 16px 0; }
.mobile-nav-item {
  display: block;
  padding: 14px 20px;
  color: #333;
  font-size: 16px;
  border-bottom: 1px solid #f0f0f0;
  transition: var(--transition);
}
.mobile-nav-item:hover, .mobile-nav-item.active {
  color: #fff;
  background: var(--color-primary);
}
.mobile-hotline {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 20px;
  color: var(--color-primary);
  font-size: 16px;
  font-weight: 600;
  border-top: 1px solid #eee;
}

/* =============================================
   HERO
   ============================================= */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #1B5E20 0%, #2E7D32 40%, #388E3C 70%, #43A047 100%);
  padding-top: var(--header-height);
  overflow: hidden;
}
.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-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(27,94,32,0.4) 0%, transparent 60%);
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 60px 20px;
  max-width: 680px;
}
.hero-sub {
  font-size: 14px;
  color: rgba(255,255,255,0.8);
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.hero-title {
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 800;
  color: #fff;
  line-height: 1.15;
  margin-bottom: 20px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.2);
}
.hero-desc {
  font-size: 18px;
  color: rgba(255,255,255,0.9);
  margin-bottom: 36px;
  line-height: 1.8;
  max-width: 540px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-badges {
  position: absolute;
  bottom: 40px;
  right: 40px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 2;
}
.hero-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(8px);
  padding: 10px 16px;
  border-radius: 50px;
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  border: 1px solid rgba(255,255,255,0.2);
}
.hero-badge i { font-size: 16px; color: #A5D6A7; }

/* =============================================
   产品分类
   ============================================= */
.products-section { background: var(--color-white); }

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.product-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.product-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
.product-icon {
  width: 56px;
  height: 56px;
  background: var(--color-bg-green);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 6px;
}
.product-icon i { font-size: 24px; color: var(--color-primary); }
.product-card:hover .product-icon { background: var(--color-primary); }
.product-card:hover .product-icon i { color: #fff; }
.product-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
}
.product-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  flex: 1;
}
.product-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--color-primary);
  font-weight: 600;
  margin-top: 6px;
}
.product-link i { transition: transform 0.2s; }
.product-card:hover .product-link i { transform: translateX(4px); }

/* =============================================
   核心优势
   ============================================= */
.advantages-section { background: var(--color-bg-green); }
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.advantage-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.advantage-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.advantage-num {
  font-size: 40px;
  font-weight: 800;
  color: var(--color-bg-green);
  line-height: 1;
  margin-bottom: 16px;
  font-style: italic;
}
.advantage-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 10px;
}
.advantage-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* =============================================
   关于我们
   ============================================= */
.about-section { background: var(--color-white); }
.about-inner {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 60px;
  align-items: center;
}
.about-text .section-sub { text-align: left; }
.about-text .section-title { text-align: left; }
.about-desc {
  font-size: 16px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  line-height: 1.8;
}
.about-tags { margin: 20px 0 28px; }
.about-tags li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 0;
  font-size: 15px;
  color: var(--color-text);
}
.about-tags li i {
  color: var(--color-primary);
  font-size: 16px;
  flex-shrink: 0;
}
.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.stat-item {
  background: var(--color-bg-green);
  border-radius: var(--radius-md);
  padding: 24px 16px;
  text-align: center;
}
.stat-num {
  display: block;
  font-size: 36px;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 6px;
}
.stat-label {
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* =============================================
   FAQ
   ============================================= */
.faq-section { background: var(--color-bg-light); }
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item {
  background: var(--color-white);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.faq-item:hover { box-shadow: var(--shadow-md); }
.faq-q {
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: var(--transition);
  background: var(--color-white);
}
.faq-q::after {
  content: '+';
  font-size: 22px;
  color: var(--color-primary);
  font-weight: 400;
  flex-shrink: 0;
  transition: transform 0.3s;
}
.faq-item.open .faq-q::after { transform: rotate(45deg); }
.faq-item.open .faq-q { color: var(--color-primary); }
.faq-a {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}
.faq-item.open .faq-a {
  max-height: 300px;
  padding: 0 24px 20px;
}
.faq-a p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  padding-top: 4px;
}

/* =============================================
   CTA
   ============================================= */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  text-align: center;
  padding: 80px 0;
}
.cta-inner h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 14px;
}
.cta-inner p {
  font-size: 17px;
  opacity: 0.9;
  margin-bottom: 36px;
}
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* =============================================
   面包屑
   ============================================= */
.breadcrumb {
  background: var(--color-bg-light);
  padding: 12px 0;
  font-size: 14px;
  color: var(--color-text-secondary);
}
.breadcrumb a { color: var(--color-accent); }
.breadcrumb a:hover { text-decoration: underline; }

/* =============================================
   页脚
   ============================================= */
.site-footer {
  background: #ffffff;
  color: #666666;
  padding-top: 60px;
  border-top: 1px solid #e0e0e0;
}
.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid #e0e0e0;
}
.footer-logo { height: 55px; margin-bottom: 16px; }
.footer-brand-desc { font-size: 14px; line-height: 1.7; margin-bottom: 8px; color: #666; }
.footer-col h4 {
  color: #333;
  font-size: 16px;
  margin-bottom: 18px;
  font-weight: 600;
}
.footer-links li { margin-bottom: 10px; }
.footer-links a {
  font-size: 14px;
  color: #666;
  transition: var(--transition);
}
.footer-links a:hover { color: var(--color-primary); padding-left: 4px; }
.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 14px;
  color: #666;
}
.footer-contact li i {
  color: var(--color-primary);
  margin-top: 3px;
  flex-shrink: 0;
}
.footer-contact a { color: #666; }
.footer-contact a:hover { color: var(--color-primary); }
.footer-bottom {
  padding: 20px 0;
  font-size: 13px;
  text-align: center;
  background: #ffffff;
  color: #999;
}
.footer-bottom p { margin-bottom: 6px; color: #999; }
.footer-bottom a { color: #999; }
.footer-bottom a:hover { color: var(--color-primary); }

/* =============================================
   右下角悬浮按钮
   ============================================= */
.float-buttons {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.float-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
  white-space: nowrap;
}
.float-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 24px rgba(0,0,0,0.25);
}
.float-btn-phone {
  background: var(--color-primary);
  color: #fff;
}
.float-btn-phone:hover { background: var(--color-primary-dark); color: #fff; }
.float-btn-wechat {
  background: #07C160;
  color: #fff;
}
.float-btn-wechat:hover { background: #059636; color: #fff; }
.float-btn-label { display: inline; }

/* =============================================
   主动弹窗
   ============================================= */
.popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 3000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  backdrop-filter: blur(4px);
}
.popup-box {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 40px;
  max-width: 440px;
  width: 100%;
  text-align: center;
  position: relative;
  box-shadow: var(--shadow-lg);
  animation: popupIn 0.3s ease;
}
@keyframes popupIn {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}
.popup-close {
  position: absolute;
  top: 16px;
  right: 16px;
  font-size: 28px;
  color: var(--color-text-secondary);
  transition: var(--transition);
  line-height: 1;
  padding: 4px;
}
.popup-close:hover { color: var(--color-text); }
.popup-icon {
  width: 64px;
  height: 64px;
  background: var(--color-bg-green);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}
.popup-icon i { font-size: 28px; color: var(--color-primary); }
.popup-box h2 { font-size: 22px; font-weight: 700; margin-bottom: 10px; color: var(--color-text); }
.popup-box > p { font-size: 15px; color: var(--color-text-secondary); margin-bottom: 24px; }
.popup-form { display: flex; flex-direction: column; gap: 12px; text-align: left; }
.popup-form input, .popup-form textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  transition: var(--transition);
  background: #fafafa;
}
.popup-form input:focus, .popup-form textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  background: #fff;
}
.popup-note {
  margin-top: 14px;
  font-size: 13px;
  color: var(--color-text-secondary);
}
.popup-note a { color: var(--color-accent); font-weight: 600; }

/* =============================================
   响应式
   ============================================= */
@media (max-width: 1024px) {
  .about-inner { grid-template-columns: 1fr; }
  .about-stats { max-width: 400px; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  :root { --header-height: 60px; }
  .main-nav, .header-hotline { display: none; }
  .mobile-menu-btn { display: block; }
  .hero-content { padding: 40px 20px; }
  .hero-badges { position: static; flex-direction: row; justify-content: center; margin-top: 30px; flex-wrap: wrap; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .section { padding: 60px 0; }
  .section-title { font-size: 26px; }
  .about-stats { grid-template-columns: repeat(4, 1fr); max-width: 100%; }
  .stat-num { font-size: 26px; }
  .stat-label { font-size: 12px; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
  .footer-col h4 { margin-bottom: 12px; }
  .cta-inner h2 { font-size: 24px; }
  .cta-actions { flex-direction: column; }
  .float-buttons { bottom: 16px; right: 16px; }
  .float-btn-label { display: none; }
  .float-btn { padding: 12px; border-radius: 50%; }
  .popup-box { padding: 28px 20px; }
  .product-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .product-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .hero-title { font-size: 36px; }
}

/* =============================================
   滚动动画
   ============================================= */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* =============================================
   表单通用
   ============================================= */
.form-group { margin-bottom: 18px; }
.form-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}
.form-input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  transition: var(--transition);
  background: #fafafa;
}
.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(46,125,50,0.1);
}