/* ============================================================
   浩丰环保官网 V2 - 全局设计系统
   ============================================================ */

/* ---------- CSS 变量 ---------- */
:root {
  /* 品牌色 - 更温暖、更有质感的蓝色 */
  --primary: #1a56db;
  --primary-light: #3b82f6;
  --primary-dark: #1e40af;
  --primary-bg: #eff6ff;
  --accent: #06b6d4;
  --accent-light: #22d3ee;
  --accent-bg: #ecfeff;

  /* 暖色点缀 - 供热行业特色 */
  --warm: #f97316;
  --warm-light: #fb923c;
  --warm-bg: #fff7ed;

  /* 语义色 */
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #6366f1;

  /* 中性色 */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;

  /* 深色模式色（用于深色区块） */
  --dark: #0f172a;
  --dark-lighter: #1e293b;
  --dark-card: #1e293b;
  --dark-text: #e2e8f0;
  --dark-muted: #94a3b8;

  /* 玻璃效果 */
  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.12);

  /* 圆角 */
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* 阴影 - 更精致的多层阴影 */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 4px 16px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.08), 0 4px 8px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.12), 0 8px 16px rgba(0,0,0,0.06);
  --shadow-primary: 0 4px 20px rgba(26,86,219,0.2), 0 2px 8px rgba(26,86,219,0.1);
  --shadow-warm: 0 4px 20px rgba(249,115,22,0.2);

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;

  /* 动画 */
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* 布局 */
  --container-max: 1200px;
  --navbar-height: 72px;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--gray-800);
  background: #fff;
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-light); }

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

ul, ol { list-style: none; }

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

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

/* ---------- 容器 ---------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 通用 Section ---------- */
.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-tag {
  display: inline-block;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--primary-bg);
  color: var(--primary);
  margin-bottom: 12px;
  letter-spacing: 1px;
  position: relative;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 8px;
  letter-spacing: -0.5px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 3px;
  margin: 8px auto 0;
}

.section-subtitle-en {
  font-size: 0.8rem;
  color: var(--gray-400);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1rem;
  color: var(--gray-500);
  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: 0.95rem;
  font-weight: 600;
  transition: all var(--transition);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.btn:hover::after { opacity: 1; }

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  box-shadow: var(--shadow-primary);
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(26,86,219,0.35);
}

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

.btn-white {
  background: #fff;
  color: var(--primary);
  font-weight: 700;
}
.btn-white:hover {
  background: var(--gray-50);
  color: var(--primary-dark);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 14px 36px;
  font-size: 1.05rem;
}

/* ---------- 卡片 ---------- */
.card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(26,86,219,0.03), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

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

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

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
}

/* ---------- 导航栏 ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  height: var(--navbar-height);
  display: flex;
  align-items: center;
  padding: 0 24px;
  transition: all var(--transition);
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid transparent;
}

.navbar.scrolled {
  background: rgba(255,255,255,0.97);
  border-bottom-color: var(--gray-200);
  box-shadow: 0 1px 12px rgba(0,0,0,0.06);
}

.nav-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo img {
  height: 38px;
  width: auto;
}

.nav-logo-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.nav-logo-zh {
  font-size: 16px;
  font-weight: 700;
  color: var(--gray-900);
  letter-spacing: 2px;
}

.nav-logo-en {
  font-size: 9px;
  color: var(--gray-400);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--gray-600);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background: var(--primary-bg);
}

.nav-cta {
  padding: 8px 20px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff !important;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.85rem;
  margin-left: 8px;
  box-shadow: 0 2px 8px rgba(26,86,219,0.3);
}

.nav-cta:hover {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary)) !important;
  transform: translateY(-1px);
}

/* 汉堡菜单 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: all var(--transition);
}

@media (max-width: 1024px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    display: none;
    position: absolute;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--gray-200);
    flex-direction: column;
    padding: 16px;
    gap: 4px;
    box-shadow: var(--shadow);
  }
  .nav-menu.open { display: flex; }
  .nav-link { width: 100%; padding: 12px 16px; }
  .nav-cta { margin-left: 0; margin-top: 8px; text-align: center; }
}

/* ---------- 页面 Hero ---------- */
.page-hero {
  padding: 120px 0 60px;
  background: linear-gradient(135deg, var(--dark) 0%, #162544 50%, var(--dark-lighter) 100%);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 80%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(26,86,219,0.12), transparent 50%);
  animation: heroGlow 8s ease-in-out infinite alternate;
}

.page-hero::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(6,182,212,0.08), transparent 50%);
  animation: heroGlow 10s ease-in-out infinite alternate-reverse;
}

@keyframes heroGlow {
  0% { transform: translate(0, 0); }
  100% { transform: translate(20px, -10px); }
}

.page-hero-icon {
  font-size: 3rem;
  display: block;
  margin-bottom: 16px;
}

.page-hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
  position: relative;
}

.page-hero-desc {
  font-size: 1.1rem;
  color: var(--dark-muted);
  max-width: 600px;
  margin: 0 auto 20px;
  position: relative;
}

.page-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  position: relative;
}

.page-hero-tags span {
  padding: 4px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  background: rgba(255,255,255,0.1);
  color: var(--accent-light);
  border: 1px solid rgba(255,255,255,0.15);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding: 16px 0;
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
}

.breadcrumb a {
  color: var(--gray-500);
  font-size: 0.9rem;
}

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

.breadcrumb .sep {
  margin: 0 8px;
  color: var(--gray-300);
}

.breadcrumb .current {
  color: var(--gray-800);
  font-weight: 600;
  font-size: 0.9rem;
}

/* ---------- Tab 切换 ---------- */
.detail-tabs {
  display: flex;
  gap: 4px;
  border-bottom: 2px solid var(--gray-200);
  margin-bottom: 32px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.detail-tab {
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--gray-500);
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: all var(--transition);
  white-space: nowrap;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.detail-tab:hover {
  color: var(--primary);
  background: var(--primary-bg);
}

.detail-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  background: rgba(26,86,219,0.04);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ---------- 表格 ---------- */
.spec-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--gray-200);
}

.spec-table th {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  padding: 14px 16px;
  text-align: left;
  font-weight: 600;
}

.spec-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-700);
}

.spec-table tr:last-child td { border-bottom: none; }

.spec-table tr:hover td { background: var(--primary-bg); }

/* ---------- 页脚 ---------- */
.footer {
  background: var(--dark);
  color: var(--dark-text);
  padding: 60px 0 24px;
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--warm), var(--primary));
  background-size: 200% 100%;
  animation: footerGradient 4s linear infinite;
}

@keyframes footerGradient {
  0% { background-position: 0% 0; }
  100% { background-position: 200% 0; }
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}

.footer-brand h3 {
  font-size: 1.3rem;
  color: #fff;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--dark-muted);
  line-height: 1.7;
}

.footer h4 {
  font-size: 1rem;
  color: #fff;
  margin-bottom: 16px;
  font-weight: 700;
  position: relative;
  padding-bottom: 8px;
}

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

.footer ul li {
  margin-bottom: 8px;
}

.footer ul a {
  color: var(--dark-muted);
  font-size: 0.88rem;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.footer ul a::before {
  content: '';
  width: 0;
  height: 1px;
  background: var(--accent-light);
  transition: width var(--transition);
}

.footer ul a:hover {
  color: var(--accent-light);
  padding-left: 4px;
}

.footer ul a:hover::before { width: 8px; }

.footer-qr {
  text-align: center;
}

.footer-qr img {
  margin: 0 auto;
  object-fit: cover;
  transition: transform var(--transition);
}

.footer-qr img:hover {
  transform: scale(1.05);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--dark-muted);
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom a { color: var(--dark-muted); }
.footer-bottom a:hover { color: var(--accent-light); }

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---------- CTA 区块 ---------- */
.cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary), var(--primary-light));
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 50%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(255,255,255,0.06), transparent 60%);
}

.cta-section::after {
  content: '';
  position: absolute;
  bottom: -50%;
  left: -10%;
  width: 40%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(6,182,212,0.08), transparent 60%);
}

.cta-section h3 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 12px;
  position: relative;
}

.cta-section p {
  font-size: 1rem;
  opacity: 0.9;
  margin-bottom: 24px;
  position: relative;
}

/* ---------- 悬浮栏 ---------- */
.float-bar {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.float-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition);
  cursor: pointer;
  color: #fff;
  position: relative;
}

.float-btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
}

.float-btn-accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
}

.float-btn-wechat {
  background: linear-gradient(135deg, #07c160, #2aae67);
}

.float-btn:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: var(--shadow-xl);
}

.float-btn-label {
  position: absolute;
  right: 58px;
  background: var(--gray-900);
  color: #fff;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.float-btn:hover .float-btn-label { opacity: 1; }

/* 微信二维码弹窗 */
.float-qr-popup {
  position: absolute;
  right: 58px;
  top: 50%;
  transform: translateY(-50%) scale(0.9);
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-xl);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition);
  white-space: nowrap;
  z-index: 10;
}

.float-qr-popup img {
  width: 140px;
  height: 140px;
  border-radius: var(--radius-sm);
  display: block;
  object-fit: cover;
}

.float-qr-popup p {
  font-size: 0.78rem;
  color: var(--gray-600);
  text-align: center;
  margin-top: 8px;
  font-weight: 500;
}

.float-btn-wechat:hover .float-qr-popup {
  opacity: 1;
  transform: translateY(-50%) scale(1);
  pointer-events: auto;
}

/* 回到顶部 */
.back-top {
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition);
}

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

/* ---------- 动画 ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

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

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

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

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* 闪光装饰线 */
.shimmer-line {
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-light), transparent);
  background-size: 200% 100%;
  animation: shimmer 3s linear infinite;
}

/* ---------- 响应式断点 ---------- */
@media (max-width: 1024px) {
  .section { padding: 60px 0; }
  .section-title { font-size: 1.7rem; }
  .page-hero h1 { font-size: 2rem; }
}

@media (max-width: 768px) {
  .section { padding: 48px 0; }
  .section-title { font-size: 1.5rem; }
  .container { padding: 0 16px; }
  .page-hero { padding: 100px 0 40px; }
  .page-hero h1 { font-size: 1.7rem; }
  .btn { padding: 10px 22px; font-size: 0.9rem; }
}

@media (max-width: 480px) {
  .section { padding: 36px 0; }
  .section-title { font-size: 1.3rem; }
  .page-hero h1 { font-size: 1.4rem; }
}