/* ============================================================
   诸城市奥丰环保设备有限公司 - 官网公共样式
   ------------------------------------------------------------
   主色：海蓝 #0E5A8C（科技与水生态）
   强调色：水蓝 #00A8E8
   设计语言：毛玻璃 / 轻阴影 / 大面积留白 / 硬朗字体
   布局策略：移动端优先，断点 768px / 1024px
============================================================ */

/* ---------------- Reset 与基础 ---------------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* 色彩系统（整体提亮一档） */
  --primary: #0E5A8C;            /* 海蓝主色 */
  --primary-dark: #0A4772;       /* 海蓝加深 */
  --primary-light: #1579B8;      /* 海蓝提亮 */
  --accent: #00A8E8;             /* 水蓝强调色 */
  --accent-dark: #008AC4;        /* 水蓝加深（用于渐变） */
  --accent-soft: rgba(0, 168, 232, 0.10);
  --text-main: #1A2B3C;          /* 正文主色 */
  --text-sub: #5A6B7C;           /* 次级文字 */
  --text-light: #9FB3C4;         /* 辅助文字 */
  --bg-white: #FFFFFF;
  --bg-light: #F4F8FB;           /* 浅灰蓝背景 */
  --bg-section: #EDF3F8;
  --border-color: #E2EAF1;

  /* 质感系统 */
  --radius: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 2px 8px rgba(10, 58, 90, 0.06);
  --shadow-md: 0 8px 24px rgba(10, 58, 90, 0.10);
  --shadow-lg: 0 16px 48px rgba(10, 58, 90, 0.16);
  --glass: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.55);

  /* 动效 */
  --transition: all 0.3s ease;
  --ease-out: cubic-bezier(0.215, 0.61, 0.355, 1);

  /* 布局 */
  --container: 1200px;
  --header-h: 72px;
}

html {
  scroll-behavior: smooth;
  /* 锚点定位时避开固定导航 */
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-main);
  background: var(--bg-white);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body.no-scroll {
  overflow: hidden;
}

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

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

ul {
  list-style: none;
}

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

/* ---------------- 通用工具类 ---------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 72px 0;
}

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

/* 区块标题（左侧竖线强调） */
.section-head {
  text-align: center;
  margin-bottom: 48px;
}

.section-head .kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}

.section-head h2 {
  font-size: 26px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 1px;
}

.section-head .sub {
  margin-top: 12px;
  color: var(--text-sub);
  font-size: 15px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

/* 标题下装饰线 */
.title-line {
  position: relative;
  display: inline-block;
  padding-bottom: 14px;
}

.title-line::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 48px;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-dark));
}

/* ---------------- 按钮系统 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 32px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 1px;
  border-radius: 50px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

/* 主按钮：水蓝渐变 */
.btn--primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  box-shadow: 0 8px 20px rgba(0, 168, 232, 0.35);
}

.btn--primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(0, 168, 232, 0.45);
}

/* 深蓝实底按钮 */
.btn--dark {
  color: #fff;
  background: var(--primary);
}

.btn--dark:hover {
  background: var(--primary-light);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* 幽灵按钮（描边） */
.btn--ghost {
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(6px);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: #fff;
}

.btn--outline {
  color: var(--accent);
  border: 1.5px solid var(--accent);
}

.btn--outline:hover {
  color: #fff;
  background: var(--accent);
  box-shadow: 0 8px 20px rgba(0, 168, 232, 0.3);
}

.btn .arrow {
  transition: var(--transition);
}

.btn:hover .arrow {
  transform: translateX(4px);
}

/* ---------------- 顶部导航栏 ---------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  display: flex;
  align-items: center;
  transition: var(--transition);
}

/* 首页：初始透明悬浮于 Banner 之上 */
.site-header--transparent {
  background: transparent;
}

/* 子页面：默认白色毛玻璃 */
.site-header--solid {
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
}

/* 滚动后统一变为白色毛玻璃 */
.site-header.scrolled {
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--glass-border);
}

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

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-mark {
  width: 42px;
  height: 42px;
  flex-shrink: 0;
  filter: drop-shadow(0 3px 6px rgba(0, 168, 232, 0.35));
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.logo-text .cn {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--primary);
}

.logo-text .en {
  font-size: 10px;
  letter-spacing: 1.5px;
  color: var(--text-light);
  text-transform: uppercase;
  font-weight: 600;
}

/* 透明状态下 Logo 文字为白色 */
.site-header--transparent:not(.scrolled) .logo-text .cn {
  color: #fff;
}

.site-header--transparent:not(.scrolled) .logo-text .en {
  color: rgba(255, 255, 255, 0.7);
}

/* 桌面菜单 */
.main-nav {
  display: none;
  align-items: center;
  gap: 6px;
}

.main-nav a {
  position: relative;
  padding: 10px 16px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  letter-spacing: 1px;
}

.site-header--transparent:not(.scrolled) .main-nav a {
  color: rgba(255, 255, 255, 0.88);
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  border-radius: 1px;
  background: linear-gradient(90deg, var(--accent), var(--accent-dark));
  transition: var(--transition);
}

.main-nav a:hover::after,
.main-nav a.active::after {
  width: 60%;
}

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

.site-header--transparent:not(.scrolled) .main-nav a:hover,
.site-header--transparent:not(.scrolled) .main-nav a.active {
  color: #fff;
}

/* 导航右侧咨询按钮 */
.nav-cta {
  display: none;
  margin-left: 14px;
}

/* 汉堡按钮（移动端） */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  z-index: 1100;
  transition: var(--transition);
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2.5px;
  border-radius: 2px;
  background: var(--primary);
  transition: var(--transition);
}

.site-header--transparent:not(.scrolled) .hamburger span {
  background: #fff;
}

.hamburger.open span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger.open span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

.hamburger.open span {
  background: var(--primary);
}

/* 移动端抽屉遮罩 */
.drawer-mask {
  position: fixed;
  inset: 0;
  z-index: 1050;
  background: rgba(10, 71, 114, 0.55);
  backdrop-filter: blur(3px);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.drawer-mask.show {
  opacity: 1;
  visibility: visible;
}

/* 移动端右侧滑出抽屉 */
.drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 1080;
  width: min(320px, 82vw);
  background: var(--bg-white);
  box-shadow: -12px 0 40px rgba(10, 58, 90, 0.25);
  transform: translateX(100%);
  transition: transform 0.3s var(--ease-out);
  display: flex;
  flex-direction: column;
  padding: 88px 28px 32px;
}

.drawer.open {
  transform: translateX(0);
}

.drawer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--accent), var(--primary));
}

.drawer-nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 15px 4px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-color);
}

.drawer-nav a::after {
  content: "›";
  color: var(--accent);
  font-size: 20px;
  font-weight: 700;
}

.drawer-nav a:hover,
.drawer-nav a.active {
  color: var(--accent);
  padding-left: 10px;
}

.drawer-cta {
  margin-top: auto;
  width: 100%;
}

.drawer-phone {
  margin-top: 18px;
  text-align: center;
  font-size: 13px;
  color: var(--text-sub);
}

.drawer-phone strong {
  display: block;
  font-size: 17px;
  color: var(--primary);
  letter-spacing: 0.5px;
}

/* ---------------- 首屏 Banner ---------------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-h) + 40px) 0 80px;
  overflow: hidden;
  color: #fff;
  /* 用多层渐变模拟工业水处理场景：深海水体 + 光束 + 底部沉积 */
  background:
    radial-gradient(ellipse 60% 45% at 78% 18%, rgba(0, 168, 232, 0.30) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 12% 82%, rgba(0, 168, 232, 0.16) 0%, transparent 55%),
    radial-gradient(ellipse 90% 60% at 50% 110%, rgba(0, 90, 152, 0.85) 0%, transparent 70%),
    linear-gradient(135deg, #0B4A78 0%, var(--primary-dark) 38%, var(--primary) 72%, #1373AC 100%);
}

/* 工业图纸网格纹理 */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 75% 65% at 50% 40%, #000 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 75% 65% at 50% 40%, #000 30%, transparent 100%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 2;
  width: 100%;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px;
  border-radius: 50px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  color: #CDEFFF;
  background: rgba(0, 168, 232, 0.14);
  border: 1px solid rgba(0, 168, 232, 0.45);
  backdrop-filter: blur(8px);
  margin-bottom: 26px;
}

.hero-badge .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.35); }
}

.hero h1 {
  font-size: 34px;
  font-weight: 900;
  letter-spacing: 3px;
  line-height: 1.3;
  margin-bottom: 22px;
  text-shadow: 0 6px 30px rgba(11, 74, 120, 0.55);
}

.hero h1 .highlight {
  background: linear-gradient(90deg, #4FD3FF, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  max-width: 560px;
  font-size: 16px;
  line-height: 2;
  color: rgba(255, 255, 255, 0.78);
  margin-bottom: 38px;
}

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

/* Banner 毛玻璃数据小卡 */
.hero-card {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  max-width: 620px;
  padding: 22px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.hero-card .item strong {
  display: block;
  font-size: 24px;
  font-weight: 800;
  color: #4FD3FF;
}

.hero-card .item span {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.72);
}

/* Banner 底部波浪 */
.hero-wave {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  z-index: 1;
  line-height: 0;
}

.hero-wave svg {
  width: 100%;
  height: 90px;
}

/* 水泡装饰 */
.bubble {
  position: absolute;
  border-radius: 50%;
  border: 1.5px solid rgba(255, 255, 255, 0.18);
  background: radial-gradient(circle at 32% 30%, rgba(255, 255, 255, 0.14), transparent 60%);
  animation: floatUp linear infinite;
  pointer-events: none;
}

@keyframes floatUp {
  0% { transform: translateY(0) scale(0.9); opacity: 0; }
  12% { opacity: 0.9; }
  100% { transform: translateY(-92vh) scale(1.12); opacity: 0; }
}

/* ---------------- 核心数据看板 ---------------- */
.stats {
  position: relative;
  z-index: 5;
  margin-top: -58px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  /* 毛玻璃数字看板 */
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.stat-item {
  background: var(--glass);
  padding: 34px 16px 30px;
  text-align: center;
  transition: var(--transition);
}

.stat-item:hover {
  background: #fff;
}

.stat-item .icon {
  width: 46px;
  height: 46px;
  margin: 0 auto 12px;
  color: var(--accent);
}

.stat-num {
  font-size: 34px;
  font-weight: 900;
  color: var(--primary);
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.5px;
}

.stat-num .suffix {
  font-size: 20px;
  color: var(--accent);
  margin-left: 2px;
}

.stat-label {
  margin-top: 6px;
  font-size: 13.5px;
  color: var(--text-sub);
  letter-spacing: 2px;
  font-weight: 600;
}

/* ---------------- 产品卡片（图片主导） ---------------- */
.products-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.product-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  overflow: hidden;
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 168, 232, 0.35);
}

/* 产品主图（渐变模拟设备实拍） */
.product-media {
  position: relative;
  display: block;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  flex-shrink: 0;
}

.product-media .ph {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.5s var(--ease-out);
}

.product-media .ph svg {
  width: 46%;
  max-width: 150px;
  opacity: 0.92;
  filter: drop-shadow(0 8px 18px rgba(9, 60, 96, 0.4));
}

.product-card:hover .product-media .ph {
  transform: scale(1.07);
}

/* 图片底部渐变压暗，衔接内容区 */
.product-media::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 60px;
  background: linear-gradient(180deg, transparent, rgba(9, 60, 96, 0.4));
  pointer-events: none;
}

/* 图片左上角标签 */
.product-media .tag {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 2;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  color: #fff;
  background: rgba(10, 71, 114, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 4px 12px;
  border-radius: 50px;
}

/* 内容区 */
.product-body {
  position: relative;
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 22px 24px 26px;
}

/* hover 时展开的强调线 */
.product-body::before {
  content: "";
  position: absolute;
  top: 0;
  left: 24px;
  right: 24px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-dark));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease-out);
}

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

.product-card h3 {
  font-size: 17.5px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 10px;
  letter-spacing: 0.5px;
  transition: var(--transition);
}

.product-card:hover h3 {
  color: var(--accent);
}

.product-card p {
  font-size: 13.5px;
  color: var(--text-sub);
  line-height: 1.9;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.product-card .more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 18px;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--accent);
}

.product-card .more svg {
  transition: var(--transition);
}

.product-card .more:hover svg {
  transform: translateX(4px);
}

/* 查看全部按钮行 */
.section-more {
  text-align: center;
  margin-top: 44px;
}

/* ---------------- 工程案例 ---------------- */
.case-list {
  display: flex;
  flex-direction: column;
  gap: 56px;
}

.case-item {
  display: flex;
  flex-direction: column;
  gap: 28px;
  align-items: center;
}

/* 项目现场图片占位（渐变模拟） */
.case-media {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  flex-shrink: 0;
}

.case-media .ph {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 12px;
  color: rgba(255, 255, 255, 0.85);
  transition: transform 0.5s var(--ease-out);
}

/* 三套占位配色，模拟不同项目现场 */
.ph--plant {
  background:
    radial-gradient(circle at 30% 25%, rgba(0, 168, 232, 0.35), transparent 55%),
    linear-gradient(140deg, #1373AC, var(--primary) 65%, #0A4772);
}

.ph--chemical {
  background:
    radial-gradient(circle at 70% 20%, rgba(79, 211, 255, 0.28), transparent 50%),
    linear-gradient(140deg, #0E5A8C, #1579B8 60%, #1373AC);
}

.ph--food {
  background:
    radial-gradient(circle at 40% 80%, rgba(0, 168, 232, 0.3), transparent 55%),
    linear-gradient(140deg, #0A4772, #0E5A8C 70%, #1579B8);
}

.case-media:hover .ph {
  transform: scale(1.06);
}

.case-media .ph svg {
  width: 72px;
  height: 72px;
  opacity: 0.9;
}

.case-media .ph em {
  font-style: normal;
  font-size: 13px;
  letter-spacing: 3px;
  font-weight: 600;
  opacity: 0.75;
}

/* 图片角落标签 */
.case-media .case-tag {
  position: absolute;
  left: 16px;
  bottom: 16px;
  padding: 7px 16px;
  border-radius: 8px;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 1px;
  color: #fff;
  background: rgba(10, 71, 114, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.case-body {
  width: 100%;
}

.case-body .kicker {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--accent);
  margin-bottom: 10px;
}

.case-body h3 {
  font-size: 21px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 14px;
  letter-spacing: 0.5px;
}

.case-body p {
  color: var(--text-sub);
  font-size: 14.5px;
  margin-bottom: 20px;
}

.case-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 22px;
}

.case-meta .m {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--bg-light);
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-sub);
}

.case-meta .m svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  color: var(--accent);
}

.case-meta .m b {
  color: var(--text-main);
  font-weight: 700;
}

/* ---------------- 页脚 ---------------- */
.site-footer {
  position: relative;
  background:
    radial-gradient(ellipse 55% 40% at 88% 8%, rgba(0, 168, 232, 0.14), transparent 60%),
    linear-gradient(160deg, #0A4A75 0%, var(--primary-dark) 100%);
  color: rgba(255, 255, 255, 0.72);
  padding: 64px 0 0;
  overflow: hidden;
}

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

.footer-brand .logo-text .cn {
  color: #fff;
}

.footer-brand .logo-text .en {
  color: rgba(255, 255, 255, 0.5);
}

.footer-brand p {
  margin-top: 18px;
  font-size: 13.5px;
  line-height: 2;
}

.footer-col h4 {
  position: relative;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 2px;
  margin-bottom: 22px;
  padding-bottom: 12px;
}

.footer-col h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 2px;
  border-radius: 1px;
  background: var(--accent);
}

.footer-col ul li {
  margin-bottom: 12px;
}

.footer-col ul a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: rgba(255, 255, 255, 0.66);
}

.footer-col ul a::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.55;
  transition: var(--transition);
}

.footer-col ul a:hover {
  color: #4FD3FF;
  transform: translateX(4px);
}

.footer-col ul a:hover::before {
  opacity: 1;
}

/* 联系方式 */
.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 13.5px;
  line-height: 1.8;
}

.footer-contact li svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
  margin-top: 4px;
  color: var(--accent);
}

.footer-contact li b {
  color: #fff;
  font-weight: 600;
}

/* 版权条 */
.footer-bottom {
  margin-top: 52px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 0;
}

.footer-bottom .inner {
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-align: center;
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.45);
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.6);
}

.footer-bottom a:hover {
  color: #4FD3FF;
}

/* ---------------- 子页面通用 ---------------- */
/* 页面顶部横幅 */
.page-hero {
  position: relative;
  padding: calc(var(--header-h) + 56px) 0 64px;
  color: #fff;
  text-align: center;
  overflow: hidden;
  background:
    radial-gradient(ellipse 55% 70% at 80% 10%, rgba(0, 168, 232, 0.28), transparent 60%),
    linear-gradient(130deg, #0B4A78 0%, var(--primary-dark) 45%, #1373AC 100%);
}

.page-hero::before {
  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: 48px 48px;
  pointer-events: none;
}

.page-hero .inner {
  position: relative;
  z-index: 2;
}

.page-hero h1 {
  font-size: 28px;
  font-weight: 900;
  letter-spacing: 4px;
  margin-bottom: 12px;
}

.page-hero .sub {
  font-size: 14px;
  letter-spacing: 2px;
  color: rgba(255, 255, 255, 0.65);
}

/* 面包屑 */
.breadcrumb {
  position: relative;
  z-index: 2;
  margin-top: 22px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.78);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.breadcrumb a:hover {
  color: #4FD3FF;
}

.breadcrumb .sep {
  opacity: 0.5;
}

/* ---------------- 产品列表页 ---------------- */
/* 分类筛选 */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 44px;
}

.filter-btn {
  padding: 10px 26px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--text-sub);
  background: #fff;
  border: 1.5px solid var(--border-color);
  transition: var(--transition);
}

.filter-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.filter-btn.active {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  border-color: transparent;
  box-shadow: 0 6px 16px rgba(0, 168, 232, 0.35);
}

/* 筛选淡出 */
.product-card.hidden-card {
  display: none;
}

/* ---------------- 详情页通用 ---------------- */
.detail-layout {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

/* 详情主图占位 */
.detail-media {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.detail-media .ph {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: rgba(255, 255, 255, 0.88);
}

.detail-media .ph svg {
  width: 110px;
  height: 110px;
  opacity: 0.92;
}

.detail-media .ph em {
  font-style: normal;
  font-size: 13px;
  letter-spacing: 4px;
  opacity: 0.7;
}

.detail-body h1 {
  font-size: 25px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 1px;
  margin-bottom: 10px;
}

.detail-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 22px;
}

.detail-meta span {
  padding: 5px 14px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(0, 168, 232, 0.25);
}

.detail-body .lead {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 2;
  padding-bottom: 22px;
  border-bottom: 1px dashed var(--border-color);
  margin-bottom: 26px;
}

/* 详情小节 */
.detail-section {
  margin-bottom: 34px;
}

.detail-section h2 {
  position: relative;
  font-size: 18px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 1px;
  padding-left: 14px;
  margin-bottom: 18px;
}

.detail-section h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 18px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--accent), var(--accent-dark));
}

.detail-section p {
  color: var(--text-sub);
  font-size: 14.5px;
  line-height: 2;
  margin-bottom: 12px;
}

/* 特性列表 */
.feature-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.feature-list li {
  display: flex;
  gap: 12px;
  padding: 16px 18px;
  background: var(--bg-light);
  border-radius: var(--radius);
  transition: var(--transition);
}

.feature-list li:hover {
  background: var(--accent-soft);
  transform: translateX(6px);
}

.feature-list li .num {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
}

.feature-list li b {
  display: block;
  color: var(--primary);
  font-size: 14.5px;
  margin-bottom: 2px;
}

.feature-list li p {
  font-size: 13px;
  margin: 0;
}

/* 参数表 */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.spec-table th,
.spec-table td {
  padding: 13px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.spec-table th {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  font-weight: 700;
  letter-spacing: 1px;
  white-space: nowrap;
}

.spec-table td:first-child {
  color: var(--primary);
  font-weight: 700;
  background: var(--bg-light);
  white-space: nowrap;
}

.spec-table td {
  color: var(--text-sub);
}

.spec-table tbody tr {
  transition: var(--transition);
}

.spec-table tbody tr:hover {
  background: rgba(0, 168, 232, 0.04);
}

/* 详情页操作条 */
.detail-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

/* 上下篇导航 */
.post-nav {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 48px;
  padding-top: 26px;
  border-top: 1px solid var(--border-color);
}

.post-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-radius: var(--radius);
  background: var(--bg-light);
  font-size: 14px;
  color: var(--text-sub);
  transition: var(--transition);
}

.post-nav a:hover {
  background: var(--accent-soft);
  color: var(--primary);
  transform: translateX(4px);
}

.post-nav a b {
  color: var(--accent);
  flex-shrink: 0;
}

/* ---------------- 新闻列表页 ---------------- */
.news-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.news-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.news-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 168, 232, 0.3);
}

.news-card .cover {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  flex-shrink: 0;
}

.news-card .cover .ph {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.85);
  transition: transform 0.5s var(--ease-out);
}

.news-card .cover svg {
  width: 56px;
  height: 56px;
  opacity: 0.85;
}

.news-card:hover .cover .ph {
  transform: scale(1.07);
}

.news-card .cover .date {
  position: absolute;
  top: 14px;
  right: 14px;
  padding: 6px 14px;
  border-radius: 8px;
  text-align: center;
  font-size: 11px;
  font-weight: 700;
  line-height: 1.4;
  color: #fff;
  background: rgba(10, 71, 114, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.news-card .cover .date b {
  display: block;
  font-size: 17px;
}

.news-card .body {
  padding: 22px 24px 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.news-card .cat {
  align-self: flex-start;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 3px 12px;
  border-radius: 50px;
  margin-bottom: 12px;
}

.news-card h3 {
  font-size: 16.5px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.55;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-card:hover h3 {
  color: var(--accent);
}

.news-card p {
  font-size: 13.5px;
  color: var(--text-sub);
  line-height: 1.9;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-card .foot {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12.5px;
  color: var(--text-light);
}

.news-card .foot .read {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  color: var(--accent);
}

.news-card .foot .read svg {
  transition: var(--transition);
}

.news-card .foot .read:hover svg {
  transform: translateX(4px);
}

/* ---------------- 新闻详情页 ---------------- */
.news-article {
  max-width: 820px;
  margin: 0 auto;
}

.news-article .head {
  text-align: center;
  margin-bottom: 30px;
}

.news-article .head h1 {
  font-size: 24px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.6;
  letter-spacing: 0.5px;
  margin: 14px 0;
}

.news-article .head .info {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 18px;
  font-size: 13px;
  color: var(--text-light);
}

.news-article .head .info span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.news-article .head .info svg {
  width: 14px;
  height: 14px;
  color: var(--accent);
}

.article-body p {
  font-size: 15px;
  color: #3D4E5E;
  line-height: 2.1;
  margin-bottom: 20px;
  text-align: justify;
}

.article-body h2 {
  position: relative;
  font-size: 18px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 1px;
  margin: 34px 0 18px;
  padding-left: 14px;
}

.article-body h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 18px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--accent), var(--accent-dark));
}

.article-body blockquote {
  margin: 24px 0;
  padding: 20px 24px;
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--accent-soft);
  color: var(--primary);
  font-size: 14.5px;
  line-height: 2;
}

/* 文内示意图占位 */
.article-figure {
  margin: 26px 0;
  aspect-ratio: 16 / 8;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.article-figure .ph {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: rgba(255, 255, 255, 0.85);
}

.article-figure svg {
  width: 64px;
  height: 64px;
  opacity: 0.85;
}

.article-figure em {
  font-style: normal;
  font-size: 12.5px;
  letter-spacing: 3px;
  opacity: 0.7;
}

/* ---------------- 关于我们 / 联系我们 ---------------- */
.about-grid {
  display: flex;
  flex-direction: column;
  gap: 36px;
  align-items: center;
}

.about-media {
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.about-media .ph {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: rgba(255, 255, 255, 0.88);
}

.about-media .ph svg {
  width: 90px;
  height: 90px;
  opacity: 0.9;
}

.about-media .ph em {
  font-style: normal;
  font-size: 12.5px;
  letter-spacing: 4px;
  opacity: 0.7;
}

/* 关于页使命卡片 */
.mission-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.mission-card {
  padding: 30px 26px;
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  text-align: center;
}

.mission-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 168, 232, 0.3);
}

.mission-card .icon-box {
  width: 64px;
  height: 64px;
  margin: 0 auto 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(0, 168, 232, 0.12), rgba(10, 58, 90, 0.08));
  color: var(--primary);
  transition: var(--transition);
}

.mission-card:hover .icon-box {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  box-shadow: 0 10px 22px rgba(0, 168, 232, 0.35);
}

.mission-card .icon-box svg {
  width: 34px;
  height: 34px;
}

.mission-card h3 {
  font-size: 17px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 8px;
}

.mission-card p {
  font-size: 13.5px;
  color: var(--text-sub);
}

/* 发展历程时间轴 */
.timeline {
  position: relative;
  max-width: 760px;
  margin: 0 auto;
  padding-left: 26px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  border-radius: 1px;
  background: linear-gradient(180deg, var(--accent), rgba(0, 168, 232, 0.12));
}

.timeline-item {
  position: relative;
  padding: 0 0 30px 26px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 7px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 3.5px solid var(--accent);
  box-shadow: 0 0 0 5px rgba(0, 168, 232, 0.15);
}

.timeline-item .year {
  display: inline-block;
  font-size: 15px;
  font-weight: 900;
  color: var(--accent);
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.timeline-item h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 6px;
}

.timeline-item p {
  font-size: 13.5px;
  color: var(--text-sub);
}

/* 联系方式卡片 */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.contact-card {
  padding: 30px 24px;
  text-align: center;
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.contact-card .icon-box {
  width: 60px;
  height: 60px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  box-shadow: 0 8px 18px rgba(0, 168, 232, 0.35);
}

.contact-card .icon-box svg {
  width: 28px;
  height: 28px;
}

.contact-card h3 {
  font-size: 16px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 8px;
}

.contact-card p {
  font-size: 14px;
  color: var(--text-sub);
  word-break: break-all;
}

.contact-card p + p {
  margin-top: 4px;
}

/* 地图占位 */
.map-placeholder {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.map-placeholder .ph {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: rgba(255, 255, 255, 0.85);
  background:
    radial-gradient(circle at 50% 45%, rgba(0, 168, 232, 0.3), transparent 55%),
    linear-gradient(140deg, #0A4A75, var(--primary) 70%, #1373AC);
  /* 模拟地图网格 */
  position: relative;
}

.map-placeholder .ph::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
}

.map-placeholder svg {
  width: 58px;
  height: 58px;
  position: relative;
  z-index: 1;
  filter: drop-shadow(0 0 14px rgba(0, 168, 232, 0.8));
}

.map-placeholder em {
  font-style: normal;
  font-size: 13px;
  letter-spacing: 2px;
  position: relative;
  z-index: 1;
  opacity: 0.8;
}

/* 留言表单 */
.form-card {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 36px 30px;
}

.form-card h3 {
  font-size: 19px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 6px;
}

.form-card .form-tip {
  font-size: 13px;
  color: var(--text-sub);
  margin-bottom: 24px;
}

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

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

.form-group label {
  display: block;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}

.form-group label .req {
  color: #E05A5A;
  margin-left: 2px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: 14px;
  font-family: inherit;
  color: var(--text-main);
  background: var(--bg-light);
  border: 1.5px solid transparent;
  border-radius: var(--radius);
  outline: none;
  transition: var(--transition);
}

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

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  background: #fff;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(0, 168, 232, 0.12);
}

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

/* 表单提交成功提示 */
.form-success {
  display: none;
  margin-top: 16px;
  padding: 14px 18px;
  border-radius: var(--radius);
  background: rgba(46, 184, 122, 0.1);
  border: 1px solid rgba(46, 184, 122, 0.35);
  color: #21996A;
  font-size: 14px;
  font-weight: 600;
}

.form-success.show {
  display: block;
  animation: fadeDown 0.4s var(--ease-out);
}

@keyframes fadeDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* CTA 横幅（深蓝渐变+毛玻璃） */
.cta-banner {
  position: relative;
  padding: 60px 0;
  text-align: center;
  color: #fff;
  overflow: hidden;
  background:
    radial-gradient(ellipse 55% 80% at 15% 20%, rgba(0, 168, 232, 0.28), transparent 55%),
    linear-gradient(120deg, #0B4A78, var(--primary-dark) 55%, #1373AC);
}

.cta-banner h2 {
  font-size: 24px;
  font-weight: 900;
  letter-spacing: 3px;
  margin-bottom: 12px;
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.72);
  margin-bottom: 28px;
  font-size: 14.5px;
}

/* ---------------- 回到顶部 ---------------- */
.back-top {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 900;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  box-shadow: 0 8px 20px rgba(0, 168, 232, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: var(--transition);
}

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

.back-top:hover {
  transform: translateY(-4px);
}

.back-top svg {
  width: 20px;
  height: 20px;
}

/* ---------------- 滚动进入动画 ---------------- */
.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 延迟等级 */
.reveal[data-delay="1"] { transition-delay: 0.12s; }
.reveal[data-delay="2"] { transition-delay: 0.24s; }
.reveal[data-delay="3"] { transition-delay: 0.36s; }

/* 用户偏好减少动画 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ============================================================
   响应式 —— 平板 ≥768px
============================================================ */
@media (min-width: 768px) {

  .section {
    padding: 88px 0;
  }

  .section-head h2 {
    font-size: 30px;
  }

  .page-hero h1 {
    font-size: 32px;
  }

  /* 导航：显示桌面菜单，隐藏汉堡 */
  .hamburger {
    display: none;
  }

  .main-nav {
    display: flex;
  }

  .nav-cta {
    display: inline-flex;
    padding: 10px 24px;
    font-size: 13.5px;
  }

  .hero h1 {
    font-size: 44px;
  }

  .hero-sub {
    font-size: 16.5px;
  }

  .hero-card {
    grid-template-columns: repeat(4, 1fr);
    padding: 26px 30px;
  }

  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .stat-item {
    padding: 40px 20px 36px;
  }

  .stat-num {
    font-size: 42px;
  }

  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* 案例左右布局 */
  .case-item {
    flex-direction: row;
    align-items: stretch;
  }

  .case-item--reverse {
    flex-direction: row-reverse;
  }

  .case-media {
    width: 46%;
    aspect-ratio: auto;
    min-height: 340px;
  }

  .case-body {
    width: 54%;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .case-meta {
    grid-template-columns: repeat(2, 1fr);
  }

  .case-body h3 {
    font-size: 23px;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 44px;
  }

  .footer-bottom .inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  .feature-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .mission-cards {
    grid-template-columns: repeat(3, 1fr);
  }

  .contact-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .form-row {
    grid-template-columns: 1fr 1fr;
  }

  .post-nav {
    grid-template-columns: 1fr 1fr;
  }

  .detail-layout {
    flex-direction: row;
    gap: 44px;
    align-items: flex-start;
  }

  .detail-layout > .detail-media {
    width: 44%;
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .detail-layout > .detail-body {
    width: 56%;
  }

  .about-grid {
    flex-direction: row;
  }

  .about-media {
    width: 48%;
  }

  .about-grid > .about-body {
    width: 52%;
  }

  .form-card {
    padding: 44px 46px;
  }

  .cta-banner h2 {
    font-size: 28px;
  }
}

/* ============================================================
   响应式 —— 桌面 ≥1024px
============================================================ */
@media (min-width: 1024px) {

  :root {
    --header-h: 80px;
  }

  .section {
    padding: 100px 0;
  }

  .hero h1 {
    font-size: 52px;
    letter-spacing: 4px;
  }

  .hero-sub {
    font-size: 17px;
  }

  .hero-card .item strong {
    font-size: 28px;
  }

  .stat-num {
    font-size: 48px;
  }

  .products-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .news-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1.6fr 1fr 1fr 1.3fr;
  }

  .news-article .head h1 {
    font-size: 27px;
  }

  .detail-body h1 {
    font-size: 28px;
  }
}