/* ================== 全局变量 ================== */
:root {
  --c-primary: #0b3d6b;
  --c-primary-2: #0a2f55;
  --c-accent: #0ea5e9;
  --c-accent-2: #0369a1;
  --c-warn: #f59e0b;
  --c-text: #1f2937;
  --c-muted: #64748b;
  --c-line: #e2e8f0;
  --c-bg: #f5f7fa;
  --c-white: #ffffff;
  --c-soft: #eef6fb;

  --shadow-sm: 0 4px 14px rgba(11, 61, 107, 0.08);
  --shadow-md: 0 10px 30px rgba(11, 61, 107, 0.12);
  --shadow-lg: 0 24px 60px rgba(11, 61, 107, 0.18);

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

  --f-display:
    "Manrope", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  --f-body:
    "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    sans-serif;

  --w-container: 1240px;
}

/* ================== 基础 ================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
body {
  font-family: var(--f-body);
  color: var(--c-text);
  background: var(--c-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}
a {
  color: var(--c-accent-2);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover {
  color: var(--c-warn);
}
sup {
  line-height: 0;
}
button {
  font-family: inherit;
  cursor: pointer;
  border: 0;
  background: none;
}

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

.kicker {
  display: inline-block;
  color: var(--c-accent-2);
  font-weight: 700;
  letter-spacing: 0.12em;
  font-size: 13px;
  margin: 0 0 12px;
  padding: 6px 12px;
  background: rgba(14, 165, 233, 0.1);
  border-radius: 999px;
}
.section-title {
  font-family: var(--f-display);
  font-size: 34px;
  line-height: 1.25;
  color: var(--c-primary);
  margin: 0 0 12px;
  font-weight: 800;
  letter-spacing: -0.01em;
}
.section-desc {
  color: var(--c-muted);
  max-width: 780px;
  margin: 0 auto 40px;
  font-size: 16px;
}
.section-head {
  text-align: center;
  margin-bottom: 48px;
}

.section {
  padding: 88px 0;
  position: relative;
}
.section-products {
  background: linear-gradient(180deg, var(--c-white) 0%, var(--c-soft) 100%);
}
.section-apps {
  background: var(--c-soft);
}
.section-advantages {
  background: var(--c-white);
}
.section-faq {
  background: linear-gradient(180deg, var(--c-soft) 0%, var(--c-white) 100%);
}
.section-contact {
  background: linear-gradient(135deg, #0b3d6b 0%, #0a2f55 100%);
  color: #e2e8f0;
}
.section-contact .kicker {
  background: rgba(245, 158, 11, 0.16);
  color: #fbbf24;
}
.section-contact .section-title {
  color: #fff;
}

/* ================== 导航 + Banner ================== */
.site-header {
  position: relative;
  color: #fff;
  isolation: isolate;
}
.nav-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 32px;
  background: rgba(11, 61, 107, 0.78);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition:
    padding 0.25s ease,
    background 0.25s ease;
}
.nav-bar.compact {
  padding: 8px 32px;
  background: rgba(11, 61, 107, 0.92);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #fff;
  font-weight: 900;
  font-family: var(--f-display);
  font-size: 22px;
  letter-spacing: 0.02em;
}
.brand-text {
  display: inline-flex;
  align-items: baseline;
  flex-wrap: wrap;
}
.brand-text .brand-sep {
  margin: 0 8px;
  color: rgba(255, 255, 255, 0.6);
  font-weight: 400;
}
.brand-text .brand-tag {
  font-size: 14px;
  font-weight: 600;
  color: #fbbf24;
  letter-spacing: 0.04em;
}
.trademark {
  font-size: 11px;
  color: #fbbf24;
  margin-left: 2px;
  font-weight: 700;
  text-shadow: 0 0 6px rgba(245, 158, 11, 0.5);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-links a {
  color: #e2e8f0;
  font-size: 14.5px;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 6px;
  transition:
    background 0.2s ease,
    color 0.2s ease;
}
.nav-links a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}
.nav-toggle {
  display: none;
  width: 36px;
  height: 36px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  border-radius: 6px;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition:
    transform 0.25s ease,
    opacity 0.25s ease;
}
.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ================== Hero ================== */
.hero {
  position: relative;
  min-height: 100vh;
  padding: 120px 0 100px;
  display: flex;
  align-items: center;
  overflow: hidden;
  color: #fff;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(135deg, #0b3d6b 0%, #0a2f55 60%, #0b3d6b 100%);
}
.hero-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(
      800px 400px at 20% 20%,
      rgba(14, 165, 233, 0.35),
      transparent 60%
    ),
    radial-gradient(
      700px 380px at 80% 70%,
      rgba(56, 189, 248, 0.25),
      transparent 60%
    );
}
.hero-waves {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 40%;
  opacity: 0.9;
}
.wave {
  animation: wave 9s ease-in-out infinite alternate;
}
.wave-2 {
  animation-duration: 11s;
  animation-direction: alternate-reverse;
  opacity: 0.65;
}
@keyframes wave {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-40px);
  }
}
.bubbles {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}
.bubbles span {
  position: absolute;
  bottom: -40px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: radial-gradient(
    circle at 30% 30%,
    rgba(255, 255, 255, 0.85),
    rgba(14, 165, 233, 0.25) 60%,
    rgba(14, 165, 233, 0) 70%
  );
  animation: bub 14s linear infinite;
  opacity: 0.7;
}
.bubbles span:nth-child(1) {
  left: 6%;
  width: 8px;
  height: 8px;
  animation-duration: 11s;
  animation-delay: 0s;
}
.bubbles span:nth-child(2) {
  left: 14%;
  width: 14px;
  height: 14px;
  animation-duration: 16s;
  animation-delay: 2s;
}
.bubbles span:nth-child(3) {
  left: 22%;
  width: 6px;
  height: 6px;
  animation-duration: 9s;
  animation-delay: 1s;
}
.bubbles span:nth-child(4) {
  left: 30%;
  width: 18px;
  height: 18px;
  animation-duration: 18s;
  animation-delay: 3s;
}
.bubbles span:nth-child(5) {
  left: 42%;
  width: 10px;
  height: 10px;
  animation-duration: 13s;
  animation-delay: 5s;
}
.bubbles span:nth-child(6) {
  left: 50%;
  width: 22px;
  height: 22px;
  animation-duration: 20s;
  animation-delay: 0s;
}
.bubbles span:nth-child(7) {
  left: 60%;
  width: 8px;
  height: 8px;
  animation-duration: 12s;
  animation-delay: 4s;
}
.bubbles span:nth-child(8) {
  left: 70%;
  width: 14px;
  height: 14px;
  animation-duration: 17s;
  animation-delay: 1s;
}
.bubbles span:nth-child(9) {
  left: 78%;
  width: 6px;
  height: 6px;
  animation-duration: 10s;
  animation-delay: 6s;
}
.bubbles span:nth-child(10) {
  left: 86%;
  width: 18px;
  height: 18px;
  animation-duration: 19s;
  animation-delay: 2s;
}
.bubbles span:nth-child(11) {
  left: 92%;
  width: 10px;
  height: 10px;
  animation-duration: 14s;
  animation-delay: 5s;
}
.bubbles span:nth-child(12) {
  left: 96%;
  width: 8px;
  height: 8px;
  animation-duration: 12s;
  animation-delay: 3s;
}
@keyframes bub {
  0% {
    transform: translateY(0) scale(0.6);
    opacity: 0;
  }
  10% {
    opacity: 0.7;
  }
  100% {
    transform: translateY(-110vh) scale(1);
    opacity: 0;
  }
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: 100%;
}
.hero-eyebrow {
  display: inline-block;
  letter-spacing: 0.28em;
  font-size: 13px;
  font-weight: 700;
  color: #fbbf24;
  margin: 0 0 18px;
  text-transform: uppercase;
}
.hero-title {
  font-family: var(--f-display);
  font-size: clamp(36px, 5.4vw, 68px);
  line-height: 1.12;
  margin: 0 0 18px;
  font-weight: 900;
  letter-spacing: -0.01em;
}
.hero-title .hl {
  background: linear-gradient(120deg, #fbbf24 0%, #fde68a 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub {
  display: inline-block;
  font-size: clamp(18px, 1.7vw, 24px);
  color: #cbd5e1;
  font-weight: 500;
  margin-top: 6px;
}
.hero-desc {
  max-width: 760px;
  font-size: 17px;
  color: #e2e8f0;
  margin: 22px 0 32px;
}
.hero-desc strong {
  color: #fbbf24;
  font-weight: 700;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 26px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.04em;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    background 0.2s ease;
  border: 1px solid transparent;
}
.btn-primary {
  color: #0b3d6b;
  background: linear-gradient(120deg, #fbbf24 0%, #f59e0b 100%);
  box-shadow: 0 10px 24px rgba(245, 158, 11, 0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(245, 158, 11, 0.5);
  color: #0a2f55;
}
.btn-ghost {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.3);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
}
.btn.block {
  display: flex;
  width: 100%;
}

.hero-stats {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 42px;
  margin: 54px 0 0;
  padding: 0;
}
.hero-stats li {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.hero-stats b {
  font-family: var(--f-display);
  font-size: 38px;
  font-weight: 800;
  color: #fbbf24;
}
.hero-stats b sup {
  font-size: 18px;
  margin-left: 2px;
}
.hero-stats span {
  font-size: 13px;
  color: #cbd5e1;
  letter-spacing: 0.06em;
}

.hero-scroll {
  position: absolute;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  width: 26px;
  height: 42px;
  border: 2px solid rgba(255, 255, 255, 0.45);
  border-radius: 14px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
}
.hero-scroll span {
  width: 4px;
  height: 8px;
  border-radius: 2px;
  background: #fff;
  animation: scrollDot 1.6s ease-in-out infinite;
}
@keyframes scrollDot {
  0% {
    transform: translateY(0);
    opacity: 1;
  }
  100% {
    transform: translateY(14px);
    opacity: 0;
  }
}

/* ================== 公司简介 ================== */
.section-about {
  background: var(--c-white);
}
.about-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 48px;
  align-items: start;
}
.lead {
  font-size: 18px;
  color: #0b3d6b;
  margin-top: 0;
}
.about-pillars {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 24px;
}
.pillar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 10px;
  background: linear-gradient(180deg, var(--c-soft), #fff);
  border: 1px solid var(--c-line);
}
.pillar i.pico {
  flex: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(120deg, var(--c-accent), var(--c-accent-2));
  color: #fff;
  font-style: normal;
  font-weight: 700;
  font-size: 14px;
}
.pillar b {
  display: block;
  font-size: 15px;
  color: var(--c-primary);
}
.pillar span {
  display: block;
  font-size: 13px;
  color: var(--c-muted);
}

.about-card {
  background: linear-gradient(160deg, var(--c-primary) 0%, #0a2f55 100%);
  color: #e2e8f0;
  border-radius: 18px;
  padding: 30px 28px;
  box-shadow: var(--shadow-lg);
  position: sticky;
  top: 96px;
}
.about-card .card-head h3 {
  font-family: var(--f-display);
  font-size: 24px;
  color: #fff;
  margin: 0 0 4px;
  font-weight: 800;
}
.about-card .card-head p {
  margin: 0 0 18px;
  color: #cbd5e1;
  font-size: 13px;
  letter-spacing: 0.04em;
}
.card-list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
}
.card-list li {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.12);
  font-size: 14.5px;
}
.card-list li:last-child {
  border-bottom: 0;
}
.card-list li span {
  color: #cbd5e1;
  flex: none;
}
.card-list li b {
  color: #fff;
  text-align: right;
  font-weight: 600;
}

/* ================== 产品矩阵 ================== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 18px;
}
.product {
  background: #fff;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--c-line);
  display: flex;
  flex-direction: column;
  transition:
    transform 0.25s ease,
    box-shadow 0.25s ease,
    border-color 0.25s ease;
  cursor: zoom-in;
  position: relative;
}
.product:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(14, 165, 233, 0.4);
}
.product .ph {
  position: relative;
  aspect-ratio: 4/3;
  background: #eef6fb;
  overflow: hidden;
}
.product .ph img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.product:hover .ph img {
  transform: scale(1.06);
}
.product .ph::after {
  content: "点击放大";
  position: absolute;
  left: 10px;
  bottom: 10px;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: #fff;
  background: rgba(11, 61, 107, 0.65);
  padding: 4px 8px;
  border-radius: 999px;
  opacity: 0;
  transition: opacity 0.2s ease;
}
.product:hover .ph::after {
  opacity: 1;
}
.product .pb {
  padding: 14px 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}
.product h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-primary);
  margin: 0;
  line-height: 1.4;
  min-height: 42px;
}
.product p {
  margin: 0;
  font-size: 12.5px;
  color: var(--c-muted);
  line-height: 1.55;
  flex: 1;
}
.product .price {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 6px;
  padding-top: 10px;
  border-top: 1px dashed var(--c-line);
}
.product .price b {
  color: #b45309;
  font-weight: 700;
  font-size: 13.5px;
}
.product .price i {
  color: var(--c-muted);
  font-style: normal;
  font-size: 12px;
}

/* 突出水消毒设备 */
.product.is-flag {
  border: 2px solid #f59e0b;
  box-shadow: 0 12px 30px rgba(245, 158, 11, 0.18);
}
.product.is-flag::before {
  content: "核心产品";
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 2;
  background: linear-gradient(120deg, #fbbf24, #f59e0b);
  color: #0b3d6b;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: 999px;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
}

/* ================== 应用领域 ================== */
.app-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.app-card {
  background: #fff;
  border-radius: 16px;
  padding: 32px 28px;
  border: 1px solid var(--c-line);
  transition:
    transform 0.25s ease,
    box-shadow 0.25s ease,
    border-color 0.25s ease;
  position: relative;
  overflow: hidden;
}
.app-card::before {
  content: "";
  position: absolute;
  inset: auto -40px -40px auto;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: radial-gradient(
    circle at 30% 30%,
    rgba(14, 165, 233, 0.18),
    transparent 60%
  );
  transition: transform 0.3s ease;
}
.app-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(14, 165, 233, 0.4);
}
.app-card:hover::before {
  transform: scale(1.4);
}
.app-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0ea5e9, #0369a1);
  color: #fff;
  margin-bottom: 18px;
}
.app-icon svg {
  width: 28px;
  height: 28px;
}
.app-card h3 {
  font-size: 19px;
  color: var(--c-primary);
  margin: 0 0 8px;
  font-weight: 800;
}
.app-card p {
  margin: 0;
  color: var(--c-muted);
  font-size: 14.5px;
  line-height: 1.7;
}

/* ================== 优势 ================== */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.adv-card {
  position: relative;
  background: linear-gradient(180deg, #fff, var(--c-soft));
  border: 1px solid var(--c-line);
  border-radius: 16px;
  padding: 32px 28px 28px;
  transition:
    transform 0.25s ease,
    box-shadow 0.25s ease,
    border-color 0.25s ease;
  overflow: hidden;
}
.adv-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(14, 165, 233, 0.4);
}
.adv-num {
  position: absolute;
  top: 14px;
  right: 18px;
  font-family: var(--f-display);
  font-size: 48px;
  font-weight: 800;
  color: rgba(14, 165, 233, 0.15);
  line-height: 1;
}
.adv-card h3 {
  font-size: 18px;
  color: var(--c-primary);
  margin: 0 0 8px;
  font-weight: 800;
}
.adv-card p {
  margin: 0;
  color: var(--c-muted);
  font-size: 14.5px;
  line-height: 1.7;
}

/* ================== FAQ ================== */
.faq-list {
  max-width: 920px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: 12px;
  padding: 18px 22px;
  transition:
    border-color 0.2s ease,
    box-shadow 0.2s ease;
}
.faq[open] {
  border-color: rgba(14, 165, 233, 0.5);
  box-shadow: var(--shadow-sm);
  background: linear-gradient(180deg, #fff, var(--c-soft));
}
.faq summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  font-weight: 700;
  color: var(--c-primary);
  font-size: 16px;
}
.faq summary::-webkit-details-marker {
  display: none;
}
.faq summary::after {
  content: "+";
  flex: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(14, 165, 233, 0.1);
  color: var(--c-accent-2);
  font-size: 18px;
  font-weight: 700;
  transition:
    transform 0.25s ease,
    background 0.2s ease;
}
.faq[open] summary::after {
  transform: rotate(45deg);
  background: var(--c-accent-2);
  color: #fff;
}
.faq .ans {
  margin-top: 12px;
  color: #334155;
  font-size: 14.5px;
  line-height: 1.85;
  padding-top: 12px;
  border-top: 1px dashed var(--c-line);
}

/* ================== 联系方式 ================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 36px;
  align-items: start;
}
.contact-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.ci-item {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 18px 20px;
  transition:
    background 0.2s ease,
    border-color 0.2s ease,
    transform 0.2s ease;
}
.ci-item:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(245, 158, 11, 0.4);
  transform: translateY(-2px);
}
.ci-label {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: #fbbf24;
  margin-bottom: 6px;
}
.ci-value {
  font-size: 15px;
  color: #fff;
  font-weight: 600;
  line-height: 1.6;
}
.ci-value a {
  color: #fff;
}
.contact-qr {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.contact-qr figure {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 18px;
  margin: 0;
  text-align: center;
}
.contact-qr img {
  width: 100%;
  max-width: 220px;
  margin: 0 auto 10px;
  border-radius: 6px;
  background: #fff;
}
.contact-qr figcaption {
  color: #cbd5e1;
  font-size: 14px;
  letter-spacing: 0.04em;
}

/* =================== 友情链接 ================== */
.section-friends {
  padding: 50px 0;
  background: #fff;
  border-top: 1px solid var(--c-line);
}
.friends-title {
  font-size: 18px;
  color: var(--c-primary);
  text-align: center;
  margin: 0 0 22px;
  font-weight: 800;
  position: relative;
}
.friends-title::before,
.friends-title::after {
  content: "";
  display: inline-block;
  width: 36px;
  height: 1px;
  background: var(--c-line);
  vertical-align: middle;
  margin: 0 14px;
}
.friends-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin: 0;
  padding: 0;
}
.friends-list a {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--c-soft);
  color: var(--c-accent-2);
  font-size: 14px;
  font-weight: 600;
  border: 1px solid transparent;
  transition:
    background 0.2s ease,
    color 0.2s ease,
    border-color 0.2s ease,
    transform 0.2s ease;
}
.friends-list a:hover {
  background: var(--c-primary);
  color: #fff;
  border-color: var(--c-primary);
  transform: translateY(-2px);
}

/* =================== 底部 ================== */
.site-footer {
  background: #061e3a;
  color: #cbd5e1;
  padding: 28px 0;
  text-align: center;
  font-size: 14px;
}
.site-footer p {
  margin: 6px 0;
}
.site-footer a {
  color: #fbbf24;
}
.site-footer a:hover {
  color: #fde68a;
}

/* =================== 灯箱 ================== */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(6, 30, 58, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 0.25s ease,
    visibility 0.25s ease;
  padding: 24px;
}
.lightbox.open {
  opacity: 1;
  visibility: visible;
}
.lightbox-close {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  font-size: 28px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}
.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.2);
}
.lightbox-stage {
  max-width: 1100px;
  width: 100%;
  text-align: center;
  transform: scale(0.96);
  transition: transform 0.25s ease;
}
.lightbox.open .lightbox-stage {
  transform: scale(1);
}
.lightbox img {
  max-width: 100%;
  max-height: 80vh;
  border-radius: 8px;
  background: #fff;
  margin: 0 auto;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.4);
}
.lightbox-cap {
  color: #fbbf24;
  margin-top: 16px;
  font-size: 15px;
  letter-spacing: 0.04em;
}

/* =================== 滚动渐显 ================== */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

/* =================== 响应式 ================== */
@media (max-width: 1200px) {
  .product-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}
@media (max-width: 1024px) {
  .section {
    padding: 72px 0;
  }
  .section-title {
    font-size: 30px;
  }
  .about-grid {
    grid-template-columns: 1fr;
  }
  .about-card {
    position: static;
  }
  .product-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .app-grid,
  .adv-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .nav-links {
    position: fixed;
    top: 60px;
    right: 14px;
    left: 14px;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    background: rgba(11, 61, 107, 0.96);
    border-radius: 12px;
    padding: 14px;
    box-shadow: var(--shadow-lg);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition:
      opacity 0.25s ease,
      visibility 0.25s ease,
      transform 0.25s ease;
  }
  .nav-links.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  .nav-links a {
    padding: 12px 14px;
    border-radius: 8px;
  }
  .nav-toggle {
    display: flex;
  }
  .hero {
    padding: 120px 0 80px;
  }
}
@media (max-width: 720px) {
  .container {
    padding: 0 16px;
  }
  .section {
    padding: 60px 0;
  }
  .section-title {
    font-size: 26px;
  }
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }
  .app-grid,
  .adv-grid {
    grid-template-columns: 1fr;
  }
  .contact-info {
    grid-template-columns: 1fr;
  }
  .contact-qr {
    grid-template-columns: 1fr 1fr;
  }
  .hero-stats {
    gap: 24px;
  }
  .hero-stats b {
    font-size: 30px;
  }
  .nav-bar {
    padding: 10px 16px;
  }
  .brand-text {
    font-size: 18px;
  }
  .brand-text .brand-tag {
    font-size: 12px;
  }
  .about-pillars {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 420px) {
  .product-grid {
    grid-template-columns: 1fr;
  }
  .contact-qr {
    grid-template-columns: 1fr;
  }
}