/* =========================================================
   瑞泉水处理 · 净化水设备营销网站 主样式
   设计：简约大气、工业水务风、信息密度高
   ========================================================= */

:root {
  --c-bg: #f5f8fc;
  --c-surface: #ffffff;
  --c-text: #1f2933;
  --c-text-soft: #4b5563;
  --c-mute: #7a8896;
  --c-line: #e5ebf1;
  --c-primary: #0a6fb8; /* 水务蓝 */
  --c-primary-dark: #075a99;
  --c-accent: #f08a24; /* 工业橙 */
  --c-accent-dark: #d97417;
  --c-water: #3fb6e2;
  --c-water-2: #74d0ee;
  --c-grad: linear-gradient(135deg, #0a6fb8 0%, #3fb6e2 100%);
  --c-grad-soft: linear-gradient(135deg, #e8f4fc 0%, #f5f8fc 100%);
  --shadow-sm:
    0 1px 2px rgba(15, 42, 79, 0.06), 0 1px 4px rgba(15, 42, 79, 0.04);
  --shadow-md:
    0 6px 18px rgba(15, 42, 79, 0.08), 0 2px 6px rgba(15, 42, 79, 0.05);
  --shadow-lg:
    0 18px 40px rgba(15, 42, 79, 0.12), 0 6px 14px rgba(15, 42, 79, 0.06);
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 18px;
  --maxw: 1240px;
  --fz-base: 16px;
  --font-sans:
    "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system,
    BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fz-base);
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img {
  max-width: 100%;
  display: block;
  height: auto;
}
a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover {
  color: var(--c-primary);
}
button {
  font: inherit;
  cursor: pointer;
  border: 0;
  background: transparent;
  color: inherit;
}
ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
h1,
h2,
h3,
h4 {
  margin: 0;
  line-height: 1.3;
  font-weight: 700;
}
.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}
.section {
  padding: 88px 0;
  position: relative;
}
.section:nth-of-type(even) {
  background: linear-gradient(180deg, #fafcfe 0%, #f5f8fc 100%);
}

.sec-head {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 56px;
}
.sec-kicker {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.3em;
  font-weight: 700;
  color: var(--c-primary);
  margin-bottom: 14px;
  padding: 4px 14px;
  border: 1px solid rgba(10, 111, 184, 0.2);
  border-radius: 999px;
  background: rgba(10, 111, 184, 0.04);
}
.sec-title {
  font-family: var(--font-serif);
  font-size: clamp(26px, 3.2vw, 38px);
  color: #0e1a2b;
  margin-bottom: 14px;
  letter-spacing: 0.02em;
}
.sec-sub {
  color: var(--c-mute);
  font-size: 15px;
  margin: 0;
}

/* ============= 顶部条 ============= */
.topbar {
  background: #0e1a2b;
  color: #c7d1dc;
  font-size: 13px;
}
.topbar-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 8px 24px;
  display: flex;
  justify-content: flex-end;
  gap: 18px;
  align-items: center;
}
.topbar strong {
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: #3b4757;
  display: inline-block;
}

/* ============= Hero 导航 + Banner ============= */
.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #062b4d 0%, #074e8c 50%, #0a6fb8 100%);
  color: #fff;
  padding-bottom: 0;
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}
.hero-wave {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 160px;
  background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 160'><path d='M0,96 C240,160 480,32 720,64 C960,96 1200,160 1440,96 L1440,160 L0,160 Z' fill='%23F5F8FC'/></svg>")
    no-repeat bottom/cover;
}
.hero-bubble {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(
    circle at 30% 30%,
    rgba(255, 255, 255, 0.35),
    rgba(255, 255, 255, 0.05) 60%,
    transparent 70%
  );
  animation: float 9s ease-in-out infinite;
}
.hero-bubble.b1 {
  width: 140px;
  height: 140px;
  left: 8%;
  top: 18%;
  animation-delay: 0s;
}
.hero-bubble.b2 {
  width: 90px;
  height: 90px;
  left: 18%;
  top: 55%;
  animation-delay: 2s;
}
.hero-bubble.b3 {
  width: 200px;
  height: 200px;
  right: 6%;
  top: 10%;
  animation-delay: 4s;
}
.hero-bubble.b4 {
  width: 60px;
  height: 60px;
  right: 22%;
  top: 60%;
  animation-delay: 1s;
}
@keyframes float {
  0%,
  100% {
    transform: translateY(0) translateX(0);
  }
  50% {
    transform: translateY(-18px) translateX(6px);
  }
}

.nav-wrap {
  position: relative;
  z-index: 5;
}
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #fff;
}
.logo-rq {
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 900;
  background: linear-gradient(180deg, #ffffff 0%, #ffe16a 50%, #f08a24 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: 0.04em;
  text-shadow: 0 2px 12px rgba(240, 138, 36, 0.45);
  position: relative;
  line-height: 1;
}
.logo-rq sup {
  font-size: 12px;
  font-weight: 700;
  -webkit-text-fill-color: #ffe16a;
  margin-left: 2px;
}
.logo-sep {
  color: rgba(255, 255, 255, 0.55);
  font-size: 22px;
  font-weight: 300;
}
.logo-tag {
  font-size: 15px;
  color: #e6f0fa;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.main-nav {
  display: flex;
  gap: 6px;
  align-items: center;
  flex-wrap: wrap;
}
.main-nav a {
  position: relative;
  padding: 10px 18px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 15px;
  font-weight: 500;
  border-radius: 8px;
  transition: all 0.2s ease;
}
.main-nav a:hover,
.main-nav a.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
}
.main-nav a.active::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: -2px;
  width: 24px;
  height: 2px;
  background: var(--c-accent);
  border-radius: 2px;
}
.nav-toggle {
  display: none;
  color: #fff;
  font-size: 24px;
}

.hero-content {
  position: relative;
  z-index: 4;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 40px 24px 100px;
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 40px;
  align-items: center;
}
.kicker {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.16em;
  font-weight: 600;
  color: #9fd0f0;
  margin: 0 0 18px;
  padding-left: 14px;
  position: relative;
}
.kicker::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 0 4px rgba(240, 138, 36, 0.18);
}
.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(34px, 4.8vw, 58px);
  line-height: 1.2;
  margin: 0 0 18px;
  letter-spacing: 0.02em;
}
.hero-title .line {
  display: block;
}
.hero-title .line-1 {
  background: linear-gradient(120deg, #ffffff 0%, #ffe9c0 60%, #f08a24 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-title .line-2 {
  font-size: clamp(22px, 2.6vw, 30px);
  color: rgba(255, 255, 255, 0.92);
  font-weight: 500;
  margin-top: 10px;
}
.hero-sub {
  color: rgba(255, 255, 255, 0.85);
  font-size: 16px;
  max-width: 560px;
  margin: 0 0 30px;
}
.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 15px;
  transition: all 0.2s ease;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, #f08a24 0%, #f5a847 100%);
  color: #fff;
  box-shadow: 0 10px 24px rgba(240, 138, 36, 0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(240, 138, 36, 0.5);
  color: #fff;
}
.btn-ghost {
  border: 1.5px solid rgba(255, 255, 255, 0.4);
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}
.hero-tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.hero-tags li {
  font-size: 13px;
  padding: 6px 14px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.92);
  background: rgba(255, 255, 255, 0.06);
}

.hero-art {
  position: relative;
  height: 420px;
}
.orbit {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 18px;
}
.tank {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  background: linear-gradient(
    160deg,
    rgba(255, 255, 255, 0.16),
    rgba(255, 255, 255, 0.04)
  );
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: flex-end;
  padding: 18px;
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.04em;
  box-shadow:
    inset 0 0 30px rgba(255, 255, 255, 0.08),
    0 10px 30px rgba(0, 0, 0, 0.18);
  transition: transform 0.3s ease;
}
.tank::before {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 60%;
  background: linear-gradient(
    180deg,
    rgba(116, 208, 238, 0) 0%,
    rgba(116, 208, 238, 0.55) 100%
  );
  border-bottom-left-radius: 16px;
  border-bottom-right-radius: 16px;
  animation: wave 6s ease-in-out infinite;
}
.tank::after {
  content: "";
  position: absolute;
  inset: auto 0 60% 0;
  height: 2px;
  background: rgba(255, 255, 255, 0.4);
  filter: blur(1px);
  animation: wave 6s ease-in-out infinite reverse;
}
.tank span {
  position: relative;
  z-index: 2;
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.3);
}
.tank:hover {
  transform: translateY(-4px);
}
@keyframes wave {
  0%,
  100% {
    transform: translateY(0) scaleY(1);
  }
  50% {
    transform: translateY(-3px) scaleY(1.05);
  }
}
.droplet {
  position: absolute;
  width: 18px;
  height: 22px;
  background: radial-gradient(
    circle at 35% 30%,
    #fff 0%,
    #74d0ee 60%,
    #3fb6e2 100%
  );
  border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
  box-shadow: 0 0 14px rgba(116, 208, 238, 0.6);
  animation: drop 5s linear infinite;
  opacity: 0.8;
}
.droplet.d1 {
  left: 8%;
  top: 0;
  animation-delay: 0s;
}
.droplet.d2 {
  left: 48%;
  top: -10px;
  animation-delay: 1.6s;
}
.droplet.d3 {
  left: 78%;
  top: 0;
  animation-delay: 3.2s;
}
@keyframes drop {
  0% {
    transform: translateY(-30px);
    opacity: 0;
  }
  20% {
    opacity: 1;
  }
  100% {
    transform: translateY(420px);
    opacity: 0;
  }
}

/* 跑马灯 */
.marquee {
  position: relative;
  z-index: 3;
  background: linear-gradient(
    90deg,
    rgba(8, 42, 77, 0.65),
    rgba(10, 111, 184, 0.4)
  );
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  overflow: hidden;
}
.marquee-track {
  display: inline-flex;
  gap: 28px;
  padding: 14px 0;
  white-space: nowrap;
  animation: scroll 50s linear infinite;
  color: #e6f0fa;
  font-size: 14px;
  letter-spacing: 0.06em;
}
.marquee-track span {
  font-weight: 500;
}
.marquee-track span:nth-child(even) {
  color: var(--c-accent);
  font-weight: 700;
}
@keyframes scroll {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

/* ============= 核心优势 ============= */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.adv-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}
.adv-card::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-water));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}
.adv-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}
.adv-card:hover::before {
  transform: scaleX(1);
}
.adv-ico {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--c-grad-soft);
  color: var(--c-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 18px;
}
.adv-card h3 {
  font-size: 18px;
  color: #0e1a2b;
  margin-bottom: 8px;
  font-weight: 700;
}
.adv-card p {
  margin: 0;
  color: var(--c-text-soft);
  font-size: 14.5px;
  line-height: 1.75;
}

/* ============= 产品中心 ============= */
.section-products {
  background: linear-gradient(180deg, #ffffff 0%, #f0f6fb 100%);
}
.filter-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 36px;
}
.filter {
  padding: 10px 22px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  background: #fff;
  color: var(--c-text-soft);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
}
.filter:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
}
.filter.active {
  background: var(--c-primary);
  color: #fff;
  border-color: var(--c-primary);
  box-shadow: 0 6px 16px rgba(10, 111, 184, 0.25);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.p-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
}
.p-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #cfe0ee;
}
.p-thumb {
  position: relative;
  aspect-ratio: 4/3;
  background: #f0f4f8;
  overflow: hidden;
  cursor: zoom-in;
}
.p-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.p-card:hover .p-thumb img {
  transform: scale(1.05);
}
.p-zoom {
  position: absolute;
  right: 10px;
  bottom: 10px;
  width: 32px;
  height: 32px;
  background: rgba(15, 42, 79, 0.7);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  backdrop-filter: blur(4px);
  opacity: 0;
  transform: translateY(6px);
  transition: all 0.25s ease;
}
.p-card:hover .p-zoom {
  opacity: 1;
  transform: translateY(0);
}
.p-body {
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.p-title {
  font-size: 16px;
  font-weight: 700;
  color: #0e1a2b;
  margin-bottom: 8px;
  line-height: 1.4;
}
.p-desc {
  font-size: 13.5px;
  color: var(--c-text-soft);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 14px;
}
.p-price {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px dashed var(--c-line);
}
.p-price .lab {
  font-size: 12px;
  color: var(--c-mute);
}
.p-price .val {
  font-size: 14px;
  font-weight: 700;
  color: var(--c-accent-dark);
}
.p-price .val a {
  color: var(--c-accent-dark);
}

/* ============= 应用领域 ============= */
.app-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.app-card {
  position: relative;
  padding: 32px 28px;
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  overflow: hidden;
}
.app-card::after {
  content: "";
  position: absolute;
  right: -30px;
  bottom: -30px;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: radial-gradient(
    circle at 30% 30%,
    rgba(10, 111, 184, 0.08),
    transparent 70%
  );
  transition: transform 0.3s ease;
}
.app-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #cfe0ee;
}
.app-card:hover::after {
  transform: scale(1.15);
}
.app-num {
  font-family: var(--font-serif);
  font-size: 46px;
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-water) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 8px;
}
.app-card h3 {
  font-size: 20px;
  color: #0e1a2b;
  margin-bottom: 10px;
}
.app-card p {
  margin: 0 0 14px;
  font-size: 14.5px;
  color: var(--c-text-soft);
  line-height: 1.8;
}
.app-tag {
  display: inline-block;
  font-size: 12.5px;
  padding: 5px 12px;
  background: rgba(10, 111, 184, 0.08);
  color: var(--c-primary);
  border-radius: 999px;
  font-weight: 500;
}

/* ============= 公司介绍 ============= */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 60px;
  align-items: start;
}
.about-text .sec-kicker {
  text-align: left;
  margin-left: 0;
}
.about-text .sec-title {
  text-align: left;
  font-size: clamp(24px, 2.6vw, 32px);
  margin-bottom: 24px;
}
.about-text p {
  margin: 0 0 16px;
  color: var(--c-text-soft);
  font-size: 15.5px;
  line-height: 1.95;
}
.about-text strong {
  color: #0e1a2b;
  font-weight: 600;
}
.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  background: linear-gradient(160deg, #062b4d 0%, #0a6fb8 100%);
  border-radius: var(--radius);
  padding: 28px;
  color: #fff;
  box-shadow: var(--shadow-lg);
}
.stat {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  padding: 20px 16px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.stat .num {
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 900;
  color: #ffe16a;
  line-height: 1;
}
.stat .lab {
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.85);
  letter-spacing: 0.05em;
}

/* ============= FAQ ============= */
.faq-list {
  max-width: 960px;
  margin: 0 auto;
  display: grid;
  gap: 12px;
}
.faq-item {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 18px 24px;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
}
.faq-item[open] {
  border-color: #cfe0ee;
  box-shadow: var(--shadow-md);
}
.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 16px;
  font-weight: 700;
  color: #0e1a2b;
  cursor: pointer;
  list-style: none;
  padding: 4px 0;
}
.faq-item summary::-webkit-details-marker {
  display: none;
}
.faq-item summary::after {
  content: "+";
  font-size: 22px;
  font-weight: 400;
  color: var(--c-primary);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(10, 111, 184, 0.08);
  transition: all 0.2s ease;
  flex-shrink: 0;
}
.faq-item[open] summary::after {
  content: "−";
  background: var(--c-primary);
  color: #fff;
  transform: rotate(180deg);
}
.faq-body {
  padding: 14px 0 4px;
  color: var(--c-text-soft);
  font-size: 14.5px;
  line-height: 1.85;
  border-top: 1px dashed var(--c-line);
  margin-top: 10px;
}

/* ============= 友情链接 ============= */
.section-links {
  padding: 60px 0;
}
.link-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}
.link-grid a {
  display: inline-flex;
  align-items: center;
  padding: 12px 26px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  background: #fff;
  color: var(--c-text-soft);
  font-size: 14.5px;
  font-weight: 500;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}
.link-grid a:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ============= 联系我们 ============= */
.section-contact {
  background: linear-gradient(180deg, #f0f6fb 0%, #e5eff8 100%);
}
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 30px;
  align-items: stretch;
}
.contact-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}
.contact-card h3 {
  font-family: var(--font-serif);
  font-size: 22px;
  color: #0e1a2b;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--c-line);
}
.contact-info ul {
  display: grid;
  gap: 14px;
}
.contact-info li {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  align-items: start;
  font-size: 15px;
  color: var(--c-text-soft);
}
.contact-info .lab {
  color: var(--c-mute);
  font-size: 13px;
  padding-top: 2px;
}
.contact-info .val {
  color: #0e1a2b;
  font-weight: 500;
}
.contact-info a {
  color: var(--c-primary);
  font-weight: 600;
}
.contact-info a:hover {
  color: var(--c-accent-dark);
}
.qr-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.qr-list figure {
  margin: 0;
  text-align: center;
}
.qr-list img {
  width: 100%;
  aspect-ratio: 1/1;
  object-fit: contain;
  border: 1px solid var(--c-line);
  border-radius: 12px;
  padding: 8px;
  background: #fafcfe;
}
.qr-list figcaption {
  margin-top: 10px;
  font-size: 13.5px;
  color: var(--c-text-soft);
}

/* ============= 底部 ============= */
.footer {
  background: #0e1a2b;
  color: #9daec0;
  padding: 32px 0;
  text-align: center;
  font-size: 13.5px;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer a {
  color: #c7d1dc;
}
.footer a:hover {
  color: var(--c-accent);
}
.ft-line {
  margin: 0;
  letter-spacing: 0.02em;
}

/* ============= 浮动条 ============= */
.float-bar {
  position: fixed;
  right: 18px;
  bottom: 24px;
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.fb-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: rgba(15, 42, 79, 0.85);
  color: #fff;
  border-radius: 999px;
  font-size: 13px;
  backdrop-filter: blur(8px);
  box-shadow: 0 6px 20px rgba(15, 42, 79, 0.3);
  transition: all 0.2s ease;
}
.fb-item:hover {
  background: var(--c-accent);
  color: #fff;
  transform: translateX(-3px);
}
.fb-ico {
  font-size: 16px;
  line-height: 1;
}
.fb-text {
  font-weight: 600;
}
.fb-top {
  background: rgba(15, 42, 79, 0.6);
}

/* ============= 灯箱 ============= */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(8, 16, 30, 0.92);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.lightbox.show {
  display: flex;
  animation: fade 0.2s ease;
}
@keyframes fade {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
.lb-stage {
  max-width: min(1100px, 92vw);
  max-height: 88vh;
  position: relative;
  text-align: center;
}
.lb-stage img {
  max-width: 100%;
  max-height: 78vh;
  object-fit: contain;
  border-radius: 12px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
}
.lb-cap {
  color: #e6f0fa;
  font-size: 14.5px;
  margin-top: 14px;
  letter-spacing: 0.05em;
}
.lb-close,
.lb-prev,
.lb-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 28px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}
.lb-close {
  top: 24px;
  right: 24px;
  transform: none;
  font-size: 24px;
}
.lb-prev {
  left: 24px;
}
.lb-next {
  right: 24px;
}
.lb-close:hover,
.lb-prev:hover,
.lb-next:hover {
  background: var(--c-accent);
  color: #fff;
}

/* ============= 响应式 ============= */
@media (max-width: 1100px) {
  .product-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (max-width: 900px) {
  .section {
    padding: 64px 0;
  }
  .sec-head {
    margin-bottom: 40px;
  }
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
  }
  .main-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: rgba(8, 42, 77, 0.97);
    backdrop-filter: blur(8px);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }
  .main-nav.open {
    max-height: 520px;
    padding: 8px 16px 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
  }
  .main-nav a {
    padding: 12px 16px;
    border-radius: 8px;
    text-align: left;
  }
  .main-nav a.active::after {
    display: none;
  }
  .hero-content {
    grid-template-columns: 1fr;
    padding: 24px 24px 80px;
    gap: 30px;
  }
  .hero-art {
    height: 280px;
    order: -1;
  }
  .orbit {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: 1fr;
  }
  .tank {
    padding: 12px;
    font-size: 13px;
    align-items: flex-end;
  }
  .topbar-inner {
    font-size: 12px;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
  }
  .adv-grid,
  .app-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }
  .about-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .about-text .sec-kicker,
  .about-text .sec-title {
    text-align: center;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .contact-info li {
    grid-template-columns: 90px 1fr;
    font-size: 14px;
    gap: 10px;
  }
  .float-bar {
    left: 12px;
    right: 12px;
    bottom: 12px;
    flex-direction: row;
    justify-content: space-between;
  }
  .fb-item {
    flex: 1;
    justify-content: center;
    padding: 10px 6px;
    font-size: 12px;
  }
  .fb-top {
    flex: 0 0 44px;
    padding: 10px;
  }
}
@media (max-width: 560px) {
  .container {
    padding: 0 16px;
  }
  .topbar-inner {
    font-size: 11.5px;
    padding: 6px 16px;
  }
  .topbar .dot {
    display: none;
  }
  .nav-inner {
    padding: 14px 16px;
    gap: 12px;
  }
  .logo-rq {
    font-size: 24px;
  }
  .logo-tag {
    font-size: 13px;
  }
  .sec-title {
    font-size: 22px;
  }
  .adv-grid,
  .app-grid {
    grid-template-columns: 1fr;
  }
  .product-grid {
    grid-template-columns: 1fr;
  }
  .qr-list {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }
  .btn {
    padding: 12px 20px;
    font-size: 14px;
  }
  .lb-prev {
    left: 8px;
  }
  .lb-next {
    right: 8px;
  }
  .lb-close {
    top: 10px;
    right: 10px;
  }
}