/* ===================================================================
   陕西瑞泉水处理 - 工业净水设备厂家
   Design: 工业精粹 · 水之韵
   =================================================================== */

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

:root {
  --c-deep: #0a2540;
  --c-primary: #14527f;
  --c-primary-2: #1a6ba5;
  --c-accent: #00a8cc;
  --c-accent-soft: #4ec3dc;
  --c-gold: #c9a86a;
  --c-bg: #f6f8fb;
  --c-bg-2: #eef2f7;
  --c-white: #ffffff;
  --c-text: #1a2332;
  --c-text-2: #4a5568;
  --c-text-3: #8a94a6;
  --c-border: #e3e8ef;
  --c-border-2: #d6dde6;

  --shadow-sm: 0 1px 2px rgba(10, 37, 64, 0.04), 0 1px 4px rgba(10, 37, 64, 0.04);
  --shadow-md: 0 4px 12px rgba(10, 37, 64, 0.06), 0 2px 4px rgba(10, 37, 64, 0.04);
  --shadow-lg: 0 16px 40px rgba(10, 37, 64, 0.10), 0 4px 12px rgba(10, 37, 64, 0.06);
  --shadow-xl: 0 24px 60px rgba(10, 37, 64, 0.14);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --ff-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  --container: 1280px;
  --header-h: 76px;
  --topbar-h: 36px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--ff-base);
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: color .25s ease; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul, ol { list-style: none; }

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

/* ===== 顶部信息条 ===== */
.topbar {
  background: var(--c-deep);
  color: rgba(255, 255, 255, 0.85);
  font-size: 13px;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
}
.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}
.topbar-item strong { color: var(--c-gold); font-weight: 600; letter-spacing: 0.5px; }
.topbar-item + .topbar-item { margin-left: 24px; }

/* ===== 导航栏 ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--c-border);
  transition: box-shadow .3s ease, background .3s ease;
}
.header.is-scrolled {
  box-shadow: var(--shadow-md);
  background: rgba(255, 255, 255, 0.98);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}
.logo {
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-decoration: none;
}
.logo-main {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--c-deep);
  letter-spacing: 0.5px;
}
.logo-r {
  color: var(--c-gold);
  font-size: 11px;
  font-weight: 600;
  margin-left: 2px;
  top: -8px;
  position: relative;
}
.logo-divider {
  color: var(--c-border-2);
  font-weight: 300;
  font-size: 18px;
}
.logo-tag {
  font-size: 14px;
  font-weight: 500;
  color: var(--c-primary);
  background: linear-gradient(90deg, var(--c-primary) 0%, var(--c-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.logo-sub {
  font-size: 10px;
  letter-spacing: 1.5px;
  color: var(--c-text-3);
  font-weight: 500;
}

.nav-list {
  display: flex;
  gap: 4px;
}
.nav-link {
  display: inline-block;
  padding: 10px 18px;
  font-size: 15px;
  font-weight: 500;
  color: var(--c-text);
  position: relative;
  border-radius: var(--radius-sm);
  transition: color .25s ease, background .25s ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 4px;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  transition: width .3s ease;
}
.nav-link:hover, .nav-link.active {
  color: var(--c-primary);
}
.nav-link:hover::after, .nav-link.active::after {
  width: 24px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  height: 28px;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--c-deep);
  transition: transform .3s ease, opacity .3s ease;
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== 通用 Section ===== */
.section {
  padding: 96px 0;
  position: relative;
}
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 56px;
}
.section-head-center {
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 12px;
}
.section-kicker {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--c-accent);
  text-transform: uppercase;
  margin-bottom: 12px;
  position: relative;
  padding-left: 36px;
}
.section-kicker::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 24px;
  height: 1px;
  background: var(--c-accent);
}
.section-head-center .section-kicker {
  padding-left: 0;
  padding-top: 18px;
}
.section-head-center .section-kicker::before {
  left: 50%;
  top: 0;
  width: 1px;
  height: 12px;
  transform: translateX(-50%);
}
.section-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--c-deep);
  line-height: 1.3;
  letter-spacing: 1px;
  position: relative;
  padding-bottom: 18px;
}
.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 48px;
  height: 3px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
}
.section-head-center .section-title::after {
  left: 50%;
  transform: translateX(-50%);
}
.section-head-right { max-width: 480px; }
.section-desc {
  font-size: 15px;
  color: var(--c-text-2);
  line-height: 1.8;
}

/* ===== 首屏 Hero ===== */
.hero {
  position: relative;
  min-height: 720px;
  background: linear-gradient(135deg, #061a2e 0%, #0a2540 40%, #0e3a5f 100%);
  color: #fff;
  overflow: hidden;
  display: flex;
  align-items: center;
  padding: 60px 0 100px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(0, 168, 204, 0.18) 0%, transparent 45%),
    radial-gradient(circle at 80% 70%, rgba(26, 107, 165, 0.20) 0%, transparent 50%),
    radial-gradient(circle at 50% 100%, rgba(201, 168, 106, 0.08) 0%, transparent 40%);
}
.hero-grid {
  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: 60px 60px;
  mask-image: radial-gradient(ellipse at center, rgba(0,0,0,0.5) 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, rgba(0,0,0,0.5) 0%, transparent 70%);
}
.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 60px;
  align-items: center;
  width: 100%;
}
.hero-content { max-width: 720px; }
.hero-tagline {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 3px;
  color: var(--c-gold);
  margin-bottom: 28px;
  padding: 8px 16px;
  background: rgba(201, 168, 106, 0.08);
  border: 1px solid rgba(201, 168, 106, 0.25);
  border-radius: 100px;
}
.hero-tagline-mark {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-gold);
  box-shadow: 0 0 0 4px rgba(201, 168, 106, 0.2);
}
.hero-title {
  font-size: 54px;
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: 2px;
  margin-bottom: 24px;
  color: #fff;
}
.hero-title-line {
  display: block;
  background: linear-gradient(180deg, #ffffff 0%, #c8d8e6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-title-line:nth-child(2) {
  background: linear-gradient(90deg, #4ec3dc 0%, #00a8cc 50%, #c9a86a 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.78);
  max-width: 620px;
  margin-bottom: 36px;
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-bottom: 40px;
  padding: 24px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.hero-stat-num {
  font-size: 32px;
  font-weight: 700;
  color: var(--c-gold);
  line-height: 1;
  margin-bottom: 6px;
}
.hero-stat-num sup {
  font-size: 18px;
  color: var(--c-accent-soft);
  margin-left: 2px;
}
.hero-stat-label {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 1px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 100px;
  transition: all .3s ease;
  white-space: nowrap;
  cursor: pointer;
  letter-spacing: 1px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--c-accent) 0%, var(--c-primary-2) 100%);
  color: #fff;
  box-shadow: 0 8px 20px rgba(0, 168, 204, 0.32);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(0, 168, 204, 0.42);
}
.btn-ghost {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.4);
}

.hero-visual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.hero-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  padding: 28px 22px;
  transition: all .4s ease;
  position: relative;
  overflow: hidden;
}
.hero-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--c-accent), transparent);
  transform: translateX(-100%);
  transition: transform .8s ease;
}
.hero-card:hover::before { transform: translateX(100%); }
.hero-card:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(0, 168, 204, 0.3);
  transform: translateY(-4px);
}
.hero-card-num {
  font-size: 13px;
  color: var(--c-gold);
  font-weight: 600;
  letter-spacing: 2px;
  margin-bottom: 12px;
}
.hero-card-title {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
  letter-spacing: 1px;
}
.hero-card-desc {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.6;
}

.hero-scroll {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 40px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 100px;
  z-index: 2;
  display: flex;
  justify-content: center;
  padding-top: 6px;
}
.hero-scroll span {
  width: 2px;
  height: 8px;
  background: var(--c-gold);
  border-radius: 2px;
  animation: scroll-anim 1.5s ease-in-out infinite;
}
@keyframes scroll-anim {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(12px); opacity: 0; }
}

/* ===== 关于 ===== */
.about { background: var(--c-white); }
.about-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 60px;
  align-items: start;
}
.about-main p {
  color: var(--c-text-2);
  margin-bottom: 20px;
  font-size: 15px;
  line-height: 1.85;
}
.about-lead {
  font-size: 17px !important;
  color: var(--c-text) !important;
  font-weight: 500;
  position: relative;
  padding-left: 18px;
  border-left: 3px solid var(--c-accent);
}
.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 40px;
}
.about-feature {
  padding: 24px;
  background: var(--c-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--c-border);
  transition: all .3s ease;
}
.about-feature:hover {
  background: #fff;
  border-color: var(--c-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.about-feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-accent) 100%);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}
.about-feature-icon svg { width: 22px; height: 22px; }
.about-feature-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--c-deep);
  margin-bottom: 6px;
}
.about-feature-desc {
  font-size: 13px;
  color: var(--c-text-2);
  line-height: 1.7;
}

.about-side {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.about-card {
  padding: 32px 20px;
  background: linear-gradient(135deg, var(--c-deep) 0%, var(--c-primary) 100%);
  color: #fff;
  border-radius: var(--radius-md);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.about-card::after {
  content: "";
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(0, 168, 204, 0.3) 0%, transparent 60%);
}
.about-card-num {
  font-size: 36px;
  font-weight: 800;
  color: var(--c-gold);
  line-height: 1;
  margin-bottom: 8px;
  position: relative;
  z-index: 1;
}
.about-card-num sup { font-size: 18px; color: var(--c-accent-soft); }
.about-card-label {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.8);
  letter-spacing: 1px;
  position: relative;
  z-index: 1;
}

/* ===== 产品 ===== */
.products { background: var(--c-bg); }
.product-filter {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 40px;
}
.filter-btn {
  padding: 9px 22px;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text-2);
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: 100px;
  transition: all .25s ease;
}
.filter-btn:hover {
  color: var(--c-primary);
  border-color: var(--c-accent);
}
.filter-btn.active {
  background: var(--c-deep);
  color: #fff;
  border-color: var(--c-deep);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.product-card {
  background: #fff;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--c-border);
  transition: all .35s ease;
  cursor: pointer;
  display: flex;
  flex-direction: column;
}
.product-card:hover {
  border-color: var(--c-accent);
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.product-thumb {
  position: relative;
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, #eef2f7 0%, #dde6f0 100%);
  overflow: hidden;
}
.product-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s ease;
}
.product-card:hover .product-thumb img { transform: scale(1.06); }
.product-zoom {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-primary);
  opacity: 0;
  transform: scale(0.8);
  transition: all .3s ease;
  backdrop-filter: blur(4px);
}
.product-card:hover .product-zoom {
  opacity: 1;
  transform: scale(1);
}
.product-body {
  padding: 18px 18px 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.product-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--c-deep);
  margin-bottom: 8px;
  line-height: 1.4;
}
.product-desc {
  font-size: 13px;
  color: var(--c-text-2);
  line-height: 1.65;
  flex: 1;
  margin-bottom: 14px;
}
.product-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px dashed var(--c-border);
}
.product-cta-phone {
  font-size: 13px;
  color: var(--c-primary);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}
.product-cta-phone svg { width: 14px; height: 14px; }
.product-cta-action {
  font-size: 12px;
  color: var(--c-accent);
  font-weight: 600;
  letter-spacing: 1px;
}

/* ===== 应用领域 ===== */
.applications { background: var(--c-white); }
.app-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
}
.app-card {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 28px 22px;
  transition: all .35s ease;
  position: relative;
  overflow: hidden;
}
.app-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
  transition: width .4s ease;
}
.app-card:hover {
  background: #fff;
  border-color: var(--c-accent);
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}
.app-card:hover::before { width: 100%; }
.app-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--c-bg-2) 0%, #fff 100%);
  border: 1px solid var(--c-border);
  color: var(--c-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  transition: all .3s ease;
}
.app-card:hover .app-icon {
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  color: #fff;
  border-color: transparent;
}
.app-icon svg { width: 24px; height: 24px; }
.app-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--c-deep);
  margin-bottom: 10px;
  letter-spacing: 1px;
}
.app-card p {
  font-size: 13px;
  color: var(--c-text-2);
  line-height: 1.7;
  margin-bottom: 14px;
}
.app-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.app-list li {
  font-size: 12px;
  color: var(--c-text-3);
  padding-left: 14px;
  position: relative;
}
.app-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  background: var(--c-accent);
  border-radius: 50%;
}

/* ===== 核心优势 ===== */
.advantage {
  background: linear-gradient(135deg, #061a2e 0%, #0a2540 50%, #0e3a5f 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
}
.advantage::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 10% 20%, rgba(0, 168, 204, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(201, 168, 106, 0.08) 0%, transparent 40%);
  pointer-events: none;
}
.advantage .section-title { color: #fff; }
.advantage .section-title::after {
  background: linear-gradient(90deg, var(--c-gold), var(--c-accent));
}
.advantage .section-kicker { color: var(--c-gold); }
.advantage .section-kicker::before { background: var(--c-gold); }
.advantage .section-desc { color: rgba(255, 255, 255, 0.7); }

.advantage-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  position: relative;
  z-index: 1;
}
.advantage-item {
  padding: 36px 28px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  transition: all .35s ease;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.advantage-item:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(0, 168, 204, 0.3);
  transform: translateY(-6px);
}
.advantage-num {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: var(--c-gold);
  letter-spacing: 2px;
  margin-bottom: 16px;
  padding: 4px 12px;
  background: rgba(201, 168, 106, 0.12);
  border: 1px solid rgba(201, 168, 106, 0.25);
  border-radius: 100px;
}
.advantage-item h3 {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  letter-spacing: 1px;
}
.advantage-item p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
}

/* ===== 流程 ===== */
.process { background: var(--c-white); }
.process-list {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  position: relative;
}
.process-list::before {
  content: "";
  position: absolute;
  top: 36px;
  left: 8%;
  right: 8%;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--c-border-2) 0, var(--c-border-2) 4px, transparent 4px, transparent 8px);
  z-index: 0;
}
.process-item {
  text-align: center;
  position: relative;
  z-index: 1;
}
.process-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--c-border-2);
  color: var(--c-primary);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
  transition: all .3s ease;
  position: relative;
}
.process-item:hover .process-num {
  background: var(--c-deep);
  color: #fff;
  border-color: var(--c-deep);
  transform: scale(1.05);
  box-shadow: 0 0 0 8px rgba(0, 168, 204, 0.1);
}
.process-item h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--c-deep);
  margin-bottom: 6px;
}
.process-item p {
  font-size: 12px;
  color: var(--c-text-2);
  line-height: 1.6;
  padding: 0 4px;
}

/* ===== FAQ ===== */
.faq { background: var(--c-bg); }
.faq-list {
  max-width: 980px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all .3s ease;
}
.faq-item.is-open {
  border-color: var(--c-accent);
  box-shadow: var(--shadow-md);
}
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 28px;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  color: var(--c-deep);
  transition: color .25s ease;
}
.faq-q:hover { color: var(--c-primary); }
.faq-q-text { flex: 1; }
.faq-q-text::before {
  content: "Q";
  display: inline-block;
  width: 28px;
  height: 28px;
  line-height: 28px;
  text-align: center;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  color: #fff;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 700;
  margin-right: 12px;
  vertical-align: middle;
}
.faq-toggle {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--c-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all .3s ease;
  color: var(--c-primary);
}
.faq-toggle::before,
.faq-toggle::after {
  content: "";
  position: absolute;
  background: currentColor;
  border-radius: 1px;
  transition: transform .3s ease;
}
.faq-toggle::before { width: 12px; height: 2px; }
.faq-toggle::after { width: 2px; height: 12px; }
.faq-item.is-open .faq-toggle {
  background: var(--c-deep);
  color: #fff;
  transform: rotate(180deg);
}
.faq-item.is-open .faq-toggle::after { transform: scaleY(0); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .4s ease;
}
.faq-a-inner {
  padding: 0 28px 24px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-text-2);
  position: relative;
  padding-left: 40px;
}
.faq-a-inner::before {
  content: "A";
  position: absolute;
  left: 28px;
  top: 0;
  width: 28px;
  height: 28px;
  line-height: 28px;
  text-align: center;
  background: var(--c-gold);
  color: #fff;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 700;
}

/* ===== 联系 ===== */
.contact { background: var(--c-white); }
.contact-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 60px;
  align-items: start;
}
.contact-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px 32px;
}
.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--c-bg) 0%, #fff 100%);
  border: 1px solid var(--c-border);
  color: var(--c-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all .3s ease;
}
.contact-item:hover .contact-icon {
  background: var(--c-deep);
  color: #fff;
  border-color: transparent;
}
.contact-icon svg { width: 22px; height: 22px; }
.contact-label {
  font-size: 12px;
  color: var(--c-text-3);
  letter-spacing: 1px;
  margin-bottom: 4px;
}
.contact-value {
  font-size: 15px;
  color: var(--c-text);
  font-weight: 500;
  line-height: 1.5;
}
.contact-link {
  color: var(--c-primary);
  border-bottom: 1px solid transparent;
}
.contact-link:hover { border-bottom-color: var(--c-primary); }

.contact-side {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.contact-card {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
}
.contact-card-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--c-deep);
  margin-bottom: 4px;
}
.contact-card-tip {
  font-size: 12px;
  color: var(--c-text-3);
  margin-bottom: 16px;
}
.qr-wrapper {
  display: inline-block;
  padding: 12px;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
}
.qr-wrapper img {
  width: 180px;
  height: 180px;
  object-fit: contain;
}
.qr-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.qr-mini {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  padding: 10px;
}
.qr-mini img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
}
.qr-mini-label {
  font-size: 12px;
  color: var(--c-text-2);
  margin-top: 6px;
}

/* ===== Footer ===== */
.footer {
  background: var(--c-deep);
  color: rgba(255, 255, 255, 0.75);
  padding: 64px 0 24px;
  position: relative;
  overflow: hidden;
}
.footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-gold), transparent);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-logo {
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}
.footer-logo sup { color: var(--c-gold); font-size: 12px; }
.footer-desc {
  font-size: 13px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: 20px;
}
.footer-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.footer-keywords span {
  font-size: 12px;
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 100px;
  color: rgba(255, 255, 255, 0.6);
}
.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 18px;
  letter-spacing: 1px;
  position: relative;
  padding-bottom: 8px;
}
.footer-col h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 24px;
  height: 2px;
  background: var(--c-gold);
}
.footer-col ul li {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.65);
  padding: 5px 0;
  transition: color .25s ease;
}
.footer-col ul li a:hover { color: var(--c-gold); }
.footer-qr {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
}
.footer-qr img {
  width: 64px;
  height: 64px;
  background: #fff;
  padding: 4px;
  border-radius: 4px;
}
.footer-qr span { font-size: 12px; color: rgba(255, 255, 255, 0.65); }
.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-copy { font-size: 13px; color: rgba(255, 255, 255, 0.55); }
.footer-meta { display: flex; gap: 20px; flex-wrap: wrap; font-size: 13px; }
.footer-meta a { color: rgba(255, 255, 255, 0.65); }
.footer-meta a:hover { color: var(--c-gold); }

/* ===== 悬浮工具栏 ===== */
.floating {
  position: fixed;
  right: 20px;
  bottom: 80px;
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.floating-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: 100px;
  color: var(--c-text);
  font-size: 13px;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  transition: all .3s ease;
}
.floating-item:hover {
  background: var(--c-deep);
  color: #fff;
  border-color: var(--c-deep);
  transform: translateX(-4px);
}
.floating-item svg { flex-shrink: 0; }

/* ===== 灯箱 ===== */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(6, 26, 46, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 40px;
  opacity: 0;
  transition: opacity .3s ease;
}
.lightbox.is-open {
  display: flex;
  opacity: 1;
}
.lightbox-content {
  max-width: 90vw;
  max-height: 85vh;
  text-align: center;
}
.lightbox-content img {
  max-width: 100%;
  max-height: 75vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  background: #fff;
  padding: 8px;
}
.lightbox-caption {
  margin-top: 16px;
  color: #fff;
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 1px;
}
.lightbox-close {
  position: absolute;
  top: 24px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  font-size: 28px;
  font-weight: 300;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .25s ease;
}
.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: rotate(90deg);
}

/* ===== 响应式 ===== */
@media (max-width: 1100px) {
  .product-grid { grid-template-columns: repeat(3, 1fr); }
  .app-grid { grid-template-columns: repeat(3, 1fr); }
  .advantage-grid { grid-template-columns: repeat(2, 1fr); }
  .process-list { grid-template-columns: repeat(3, 1fr); gap: 32px 16px; }
  .process-list::before { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { max-width: 600px; }
  .hero-title { font-size: 44px; }
}

@media (max-width: 820px) {
  :root { --header-h: 64px; }
  .topbar { display: none; }
  .nav { display: none; }
  .nav.is-open {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    padding: 16px 24px 24px;
    border-top: 1px solid var(--c-border);
    box-shadow: var(--shadow-lg);
  }
  .nav.is-open .nav-list { flex-direction: column; gap: 0; }
  .nav.is-open .nav-link { display: block; padding: 14px 0; border-bottom: 1px solid var(--c-border); }
  .nav.is-open .nav-link:last-child { border-bottom: none; }
  .nav.is-open .nav-link::after { display: none; }
  .nav-toggle { display: flex; }
  .logo-main { font-size: 16px; }
  .logo-tag { font-size: 12px; }
  .logo-sub { display: none; }
  .logo-divider { display: none; }
  .section { padding: 64px 0; }
  .section-title { font-size: 28px; }
  .section-head { flex-direction: column; align-items: flex-start; gap: 16px; margin-bottom: 40px; }
  .section-head-center { text-align: left; align-items: flex-start; }
  .section-head-center .section-kicker { padding-left: 36px; padding-top: 0; }
  .section-head-center .section-kicker::before { left: 0; top: 50%; transform: translateY(-50%); }
  .section-head-center .section-title::after { left: 0; transform: none; }
  .hero { min-height: 600px; padding: 40px 0 60px; }
  .hero-title { font-size: 32px; letter-spacing: 1px; }
  .hero-stats { gap: 16px; flex-wrap: wrap; }
  .hero-stat { flex: 1; min-width: 90px; }
  .hero-stat-num { font-size: 26px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .app-grid { grid-template-columns: repeat(2, 1fr); }
  .advantage-grid { grid-template-columns: 1fr; gap: 16px; }
  .advantage-item { padding: 28px 22px; }
  .process-list { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-features { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .contact-info { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .floating { right: 12px; bottom: 20px; }
  .floating-item span { display: none; }
  .floating-item { padding: 12px; border-radius: 50%; }
  .lightbox { padding: 20px; }
  .lightbox-close { top: 12px; right: 12px; }
}

@media (max-width: 480px) {
  .product-grid { grid-template-columns: 1fr; }
  .app-grid { grid-template-columns: 1fr; }
  .process-list { grid-template-columns: 1fr; }
  .product-filter { gap: 6px; }
  .filter-btn { padding: 7px 16px; font-size: 13px; }
}

/* ===== 入场动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .8s ease, transform .8s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--c-bg); }
::-webkit-scrollbar-thumb { background: var(--c-border-2); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--c-primary); }