/* ==========================================================================
   达纳博 DannaBot 官网 — 全局样式
   主色 #003a66 / 辅助色 #29abe2
   ========================================================================== */

:root {
  --c-primary: #003a66;        /* 主色 · 深海蓝 */
  --c-secondary: #29abe2;      /* 辅助色 · 亮青 */
  --c-dark: #001c30;           /* 深背景 */
  --c-dark-2: #002a48;         /* 中深蓝 */
  --c-ink: #17354d;            /* 白底上的正文/导航文字 */
  --c-white: #ffffff;
  --c-muted: #9db9cd;          /* 深底辅助文字 */
  --c-line: rgba(255, 255, 255, 0.14);

  --font-sans: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;

  --nav-h: 76px;
  --container: 1240px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--c-ink);
  background: #ffffff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
}

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

a { color: inherit; }

/* ==========================================================================
   按钮
   ========================================================================== */
.dn-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  line-height: 1;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.dn-btn--primary {
  background: linear-gradient(135deg, #3cbcf0 0%, #0e8ad0 100%);
  color: #ffffff;
  box-shadow: 0 8px 26px rgba(41, 171, 226, 0.45);
}
.dn-btn--primary:hover {
  background: linear-gradient(135deg, #5cc8f5 0%, #29abe2 100%);
  transform: translateY(-2px);
  box-shadow: 0 14px 34px rgba(41, 171, 226, 0.72);
}
.dn-btn--primary:active {
  transform: translateY(0);
}
/* 主按钮呼吸光（吸引点击，仅首页 Hero 内） */
.dn-hero .dn-btn--primary {
  animation: dnBtnPulse 2.4s ease-in-out infinite;
}
.dn-hero .dn-btn--primary:hover {
  animation: none;
}
@keyframes dnBtnPulse {
  0%, 100% { box-shadow: 0 8px 26px rgba(41, 171, 226, 0.4); }
  50%      { box-shadow: 0 10px 32px rgba(41, 171, 226, 0.7), 0 0 0 6px rgba(41, 171, 226, 0.16); }
}
/* 扫光动效 */
.dn-btn--primary::after {
  content: "";
  position: absolute;
  top: 0; left: -140%;
  width: 55%; height: 100%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.5), transparent);
  transform: skewX(-20deg);
  transition: left 0.55s ease;
  pointer-events: none;
}
.dn-btn--primary:hover::after { left: 150%; }

.dn-btn--ghost {
  background: rgba(255, 255, 255, 0.04);
  color: var(--c-white);
  border-color: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(4px);
}
.dn-btn--ghost:hover {
  background: #ffffff;
  color: #111111;
  border-color: #ffffff;
  box-shadow: 0 8px 26px rgba(0, 0, 0, 0.35);
  transform: translateY(-2px);
}
.dn-btn--ghost:active { transform: translateY(0); }

.dn-btn--outline {
  background: transparent;
  color: var(--c-primary);
  border-color: rgba(0, 58, 102, 0.35);
}
.dn-btn--outline:hover {
  background: var(--c-primary);
  color: #ffffff;
  border-color: var(--c-primary);
  transform: translateY(-2px);
}
.dn-btn--outline:active { transform: translateY(0); }

/* ==========================================================================
   顶部导航
   ========================================================================== */
.dn-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background 0.35s ease, box-shadow 0.35s ease;
}

.dn-nav__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.dn-nav__logo img {
  height: 34px;
  width: auto;
  display: block;
}
.dn-nav__logo .dn-nav__logo--color { display: none; }

.dn-nav__menu {
  display: flex;
  align-items: center;
  gap: 36px;
}

.dn-nav__menu a {
  position: relative;
  color: rgba(255, 255, 255, 0.82);
  font-size: 15px;
  text-decoration: none;
  padding: 6px 0;
  transition: color 0.2s ease;
}
.dn-nav__menu a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  height: 2px; width: 0;
  background: var(--c-secondary);
  border-radius: 2px;
  transition: width 0.25s ease;
}
.dn-nav__menu a:hover,
.dn-nav__menu a.is-active { color: #ffffff; }
.dn-nav__menu a:hover::after,
.dn-nav__menu a.is-active::after { width: 100%; }

.dn-nav__actions { display: flex; align-items: center; gap: 14px; }
.dn-nav__cta { padding: 11px 22px; font-size: 14px; }
.dn-lang {
  position: relative;
}
.dn-lang__btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  font-size: 14px;
  font-family: inherit;
  color: rgba(255, 255, 255, 0.82);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.dn-lang__btn:hover { color: #ffffff; }
.dn-lang__caret { transition: transform 0.2s ease; }
.dn-lang__btn[aria-expanded="true"] .dn-lang__caret { transform: rotate(180deg); }
.dn-lang__menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 120px;
  background: #ffffff;
  border: 1px solid #eef2f5;
  border-radius: 8px;
  box-shadow: 0 12px 30px rgba(0, 40, 70, 0.14);
  padding: 6px;
  display: none;
  z-index: 10;
}
.dn-lang__menu.is-open { display: block; }
.dn-lang__option {
  display: block;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 14px;
  color: #33566e;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
}
.dn-lang__option:hover { background: #f0f4f7; color: var(--c-primary); }
.dn-lang__option.is-active { color: var(--c-primary); font-weight: 600; }

/* 移动端菜单内的语言切换 */
.dn-nav__lang {
  display: none;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid #eef3f7;
}
.dn-nav__lang-label {
  display: block;
  margin-bottom: 10px;
  font-size: 13px;
  color: #8097a8;
}
.dn-nav__lang-opts {
  display: flex;
  gap: 10px;
}
.dn-nav__lang-opts a {
  flex: 1;
  padding: 10px;
  text-align: center;
  border: 1px solid #e0e8ee;
  border-radius: 8px;
  font-size: 14px;
  color: #33566e;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.dn-nav__lang-opts a.is-active {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: #ffffff;
}

.dn-nav.is-scrolled .dn-lang__btn { color: #33566e; }
.dn-nav.is-scrolled .dn-lang__btn:hover { color: var(--c-primary); }

/* 汉堡按钮（移动端） */
.dn-nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px; height: 44px;
  padding: 10px;
  background: transparent;
  border: 0;
  cursor: pointer;
}
.dn-nav__toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: #ffffff;
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease, background 0.25s ease;
}

/* 滚动后：白底黑字 */
.dn-nav.is-scrolled {
  background: #ffffff;
  box-shadow: 0 10px 30px rgba(0, 40, 70, 0.08);
}
.dn-nav.is-scrolled .dn-nav__logo--white { display: none; }
.dn-nav.is-scrolled .dn-nav__logo--color { display: block; }
.dn-nav.is-scrolled .dn-nav__menu a { color: #33566e; }
.dn-nav.is-scrolled .dn-nav__menu a:hover,
.dn-nav.is-scrolled .dn-nav__menu a.is-active { color: var(--c-primary); }
.dn-nav.is-scrolled .dn-nav__toggle span { background: var(--c-ink); }

/* ==========================================================================
   Hero 首屏 —— 全屏轮播（背景 + 文案 一起切换）
   ========================================================================== */
.dn-hero {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
  background: var(--c-dark);
  color: #ffffff;
}

/* --- 轮播容器 --- */
.dn-hero__slides {
  position: absolute;
  inset: 0;
  z-index: 1;
}

/* --- 单屏（背景 + 遮罩 + 文案） --- */
.dn-hero__slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 1.1s ease, visibility 1.1s ease;
}
.dn-hero__slide.is-active {
  opacity: 1;
  visibility: visible;
}

.dn-hero__slide-bgwrap {
  position: absolute;
  inset: -28px;
  z-index: 0;
  will-change: transform;
}
.dn-hero__slide-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}

/* 文案（淡入上移） */
.dn-hero__inner {
  position: relative;
  z-index: 2;
  min-height: 100vh;
  display: flex;
  align-items: flex-end;
  max-width: var(--container);
  margin: 0 auto;
  padding: calc(var(--nav-h) + 40px) 24px 84px;
}
.dn-hero__content { max-width: 620px; }

/* 入场动效：子元素依次上浮（错峰） */
.dn-hero__tag,
.dn-hero__slogan,
.dn-hero__desc,
.dn-hero__actions,
.dn-hero__specs {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
/* 标题：遮罩上卷 + 上浮 */
.dn-hero__title {
  opacity: 0;
  transform: translateY(34px);
  clip-path: inset(0 0 100% 0);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.8s cubic-bezier(0.22, 1, 0.36, 1),
    clip-path 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}

.dn-hero__slide.is-active .dn-hero__tag     { opacity: 1; transform: translateY(0); transition-delay: 0.05s; }
.dn-hero__slide.is-active .dn-hero__title   { opacity: 1; transform: translateY(0); clip-path: inset(-20% -20% -20% -20%); transition-delay: 0.15s; }
.dn-hero__slide.is-active .dn-hero__slogan  { opacity: 1; transform: translateY(0); transition-delay: 0.34s; }
.dn-hero__slide.is-active .dn-hero__desc    { opacity: 1; transform: translateY(0); transition-delay: 0.46s; }
.dn-hero__slide.is-active .dn-hero__actions { opacity: 1; transform: translateY(0); transition-delay: 0.58s; }
.dn-hero__slide.is-active .dn-hero__specs   { opacity: 1; transform: translateY(0); transition-delay: 0.70s; }

.dn-hero__tag {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-size: clamp(18px, 2.4vw, 26px);
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--c-secondary);
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.5);
}
.dn-hero__tag::before {
  content: "";
  width: 34px;
  height: 2px;
  background: var(--c-secondary);
}

.dn-hero__title {
  margin: 24px 0 12px;
  font-size: clamp(52px, 7vw, 92px);
  line-height: 0.98;
  font-weight: 800;
  letter-spacing: -1.5px;
  color: #ffffff;
  text-shadow:
    0 0 12px rgba(41, 171, 226, 0.35),
    0 0 40px rgba(41, 171, 226, 0.15),
    0 2px 6px rgba(0, 0, 0, 0.55),
    0 4px 30px rgba(0, 10, 20, 0.6);
}
.dn-hero__title span {
  color: var(--c-secondary);
}

.dn-hero__slogan {
  margin: 0 0 24px;
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 500;
  color: #eaf5fb;
  letter-spacing: 1px;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.55);
}

.dn-hero__desc {
  max-width: 560px;
  margin: 0 0 36px;
  font-size: 16px;
  line-height: 2;
  color: var(--c-muted);
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.5);
}

.dn-hero__actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.dn-hero__specs {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
  margin-top: 44px;
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}
.dn-hero__specs li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 1px;
  color: #8fb0c7;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.5);
}
.dn-hero__specs li::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--c-secondary);
  box-shadow: 0 0 10px var(--c-secondary);
}

/* --- 电路板纹理背景 --- */
.dn-hero__circuit {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background-image: url('../img/circuit.svg');
  background-size: 220px 220px;
  opacity: 0.07;
  animation: dnCircuit 5.5s ease-in-out infinite;
}
@keyframes dnCircuit {
  0%, 100% { opacity: 0.03; }
  50%      { opacity: 0.2; }
}

/* --- 顶部光柱 --- */
.dn-hero__ray {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background:
    conic-gradient(from 185deg at 68% -8%, transparent 42%, rgba(41, 171, 226, 0.16) 49%, transparent 56%),
    conic-gradient(from 180deg at 76% -10%, transparent 44%, rgba(41, 171, 226, 0.1) 50%, transparent 58%);
  filter: blur(1px);
}

/* --- 浮动粒子 --- */
.dn-hero__particles {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  overflow: hidden;
}
.dn-hero__particles span {
  position: absolute;
  bottom: -12px;
  border-radius: 50%;
  background: var(--c-secondary);
  box-shadow: 0 0 9px var(--c-secondary);
  opacity: 0;
  animation-name: dnFloat;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}
@keyframes dnFloat {
  0%   { transform: translateY(0) translateX(0); opacity: 0; }
  8%   { opacity: 0.75; }
  85%  { opacity: 0.35; }
  100% { transform: translateY(-106vh) translateX(30px); opacity: 0; }
}

/* --- 扫描线 --- */
.dn-hero__scan {
  position: absolute;
  left: 0; right: 0;
  height: 2px;
  z-index: 3;
  pointer-events: none;
  background: linear-gradient(90deg, transparent, var(--c-secondary) 32%, #eaffff 50%, var(--c-secondary) 68%, transparent);
  box-shadow: 0 0 28px 5px rgba(41, 171, 226, 0.55);
  animation: dnScan 6.5s linear infinite;
}
@keyframes dnScan {
  0%   { top: 6%; opacity: 0; }
  8%   { opacity: 1; }
  92%  { opacity: 1; }
  100% { top: 94%; opacity: 0; }
}

/* --- CCTV 取景框四角 --- */
.dn-hero__vf {
  position: absolute;
  width: 24px; height: 24px;
  border: 2px solid rgba(41, 171, 226, 0.6);
  z-index: 3;
  pointer-events: none;
}
.dn-hero__vf--tl { top: 100px; left: 22px; border-right: 0; border-bottom: 0; }
.dn-hero__vf--tr { top: 100px; right: 22px; border-left: 0; border-bottom: 0; }
.dn-hero__vf--bl { bottom: 22px; left: 22px; border-right: 0; border-top: 0; }
.dn-hero__vf--br { bottom: 22px; right: 22px; border-left: 0; border-top: 0; }

/* --- 轮播圆点 --- */
.dn-hero__dots {
  position: absolute;
  left: 50%;
  bottom: 34px;
  transform: translateX(-50%);
  z-index: 6;
  display: flex;
  gap: 10px;
}
.dn-hero__dots button {
  position: relative;
  width: 44px; height: 24px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}
.dn-hero__dots button::before {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  width: 26px; height: 3px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.28);
  transition: width 0.3s ease, background 0.3s ease;
}
.dn-hero__dots button.is-active::before {
  width: 44px;
  background: var(--c-secondary);
}

/* --- 左右切换按钮 --- */
.dn-hero__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 6;
  width: 52px; height: 52px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.32);
  background: rgba(0, 24, 46, 0.35);
  backdrop-filter: blur(5px);
  color: #ffffff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.25s ease, border-color 0.25s ease, background 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}
.dn-hero__arrow--prev { left: 26px; }
.dn-hero__arrow--next { right: 26px; }
.dn-hero__arrow:hover {
  color: var(--c-secondary);
  border-color: var(--c-secondary);
  background: rgba(41, 171, 226, 0.18);
  box-shadow: 0 0 26px rgba(41, 171, 226, 0.5);
  transform: translateY(-50%) scale(1.07);
}
.dn-hero__arrow:active {
  transform: translateY(-50%) scale(0.95);
}

/* ==========================================================================
   通用滚动入场
   ========================================================================== */
.dn-reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.dn-reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   产品
   ========================================================================== */
.dn-products {
  background: #ffffff;
  padding: 104px 0;
}
.dn-products__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-products__head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}
.dn-products__kicker {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 4px;
  color: var(--c-secondary);
  text-transform: uppercase;
}
.dn-products__title {
  margin: 18px 0 14px;
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 800;
  color: #0b1c2c;
  letter-spacing: -0.5px;
}
.dn-products__desc {
  font-size: 16px;
  line-height: 1.9;
  color: #6b7d8c;
}
.dn-products__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.dn-product {
  display: flex;
  flex-direction: column;
  background: #ffffff;
  border: 1px solid #eef2f5;
  border-radius: 14px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.dn-product:hover {
  transform: translateY(-6px);
  box-shadow: 0 22px 50px rgba(0, 40, 70, 0.12);
  border-color: rgba(41, 171, 226, 0.45);
}
.dn-product__media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #eef2f6;
}
.dn-product__media img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.dn-product:hover .dn-product__media img {
  transform: scale(1.06);
}
.dn-product__badge {
  position: absolute;
  top: 14px; left: 14px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  color: #ffffff;
  background: rgba(0, 40, 70, 0.62);
  padding: 5px 12px;
  border-radius: 4px;
  backdrop-filter: blur(4px);
}
.dn-product__badge--hot {
  background: #e53935;
  color: #ffffff;
}
.dn-product__body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 24px 26px 26px;
}
.dn-product__name {
  margin: 0 0 10px;
  font-size: 24px;
  font-weight: 800;
  color: #0b1c2c;
}
.dn-product__name span { color: var(--c-secondary); }
.dn-product__desc {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.8;
  color: #6b7d8c;
  flex: 1;
}
.dn-product__more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-primary);
}
.dn-product__more svg { transition: transform 0.25s ease; }
.dn-product:hover .dn-product__more { color: var(--c-secondary); }
.dn-product:hover .dn-product__more svg { transform: translateX(4px); }
.dn-products__more {
  text-align: center;
  margin-top: 44px;
}

/* ==========================================================================
   通用区块头
   ========================================================================== */
.dn-sec-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}
.dn-sec-head__kicker {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 4px;
  color: var(--c-secondary);
  text-transform: uppercase;
}
.dn-sec-head__title {
  margin: 18px 0 14px;
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 800;
  color: #0b1c2c;
  letter-spacing: -0.5px;
}
.dn-sec-head__desc {
  font-size: 16px;
  line-height: 1.9;
  color: #6b7d8c;
}

/* ==========================================================================
   解决方案
   ========================================================================== */
.dn-solutions {
  background: #f4f9fc;
  padding: 104px 0;
}
.dn-solutions__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-solutions__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.dn-solutions--page .dn-solutions__grid {
  grid-template-columns: repeat(2, 1fr);
}
.dn-solutions__grid--auto {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
@media (max-width: 992px) {
  .dn-solutions--page .dn-solutions__grid { grid-template-columns: 1fr; }
}
.dn-solution {
  background: #ffffff;
  border: 1px solid #eef2f5;
  border-radius: 14px;
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}
.dn-solution:hover {
  border-color: rgba(41, 171, 226, 0.4);
  box-shadow: 0 16px 40px rgba(0, 40, 70, 0.08);
  transform: translateY(-4px);
}
.dn-solution__media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #eef2f6;
}
.dn-solution__media img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.dn-solution:hover .dn-solution__media img { transform: scale(1.06); }
.dn-solution__body {
  padding: 26px 28px 30px;
}
.dn-solution__title {
  margin: 0 0 12px;
  font-size: 20px;
  font-weight: 700;
  color: #0b1c2c;
}
.dn-solution__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: #6b7d8c;
}

/* ==========================================================================
   关于达纳博
   ========================================================================== */
.dn-about {
  position: relative;
  overflow: hidden;
  background: linear-gradient(150deg, #001c30 0%, #002a48 52%, #001c30 100%);
  padding: 104px 0;
}
.dn-about__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: url('../img/circuit.svg');
  background-size: 220px 220px;
  opacity: 0.08;
  -webkit-mask-image: radial-gradient(80% 85% at 68% 50%, #000 0%, transparent 100%);
  mask-image: radial-gradient(80% 85% at 68% 50%, #000 0%, transparent 100%);
}
.dn-about__inner {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.dn-about__title {
  margin: 18px 0 18px;
  font-size: clamp(30px, 4vw, 42px);
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.5px;
}
.dn-about__lead {
  margin: 0 0 14px;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.7;
  color: #cfe6f5;
}
.dn-about__text {
  margin: 0 0 28px;
  font-size: 15px;
  line-height: 1.9;
  color: #9db9cd;
}
.dn-about__more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-secondary);
  text-decoration: none;
}
.dn-about__more svg { transition: transform 0.25s ease; }
.dn-about__more:hover { color: #4fbeec; }
.dn-about__more:hover svg { transform: translateX(4px); }
.dn-about__caps {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.dn-cap {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 26px 24px;
  backdrop-filter: blur(4px);
  transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}
.dn-cap:hover {
  border-color: rgba(41, 171, 226, 0.5);
  box-shadow: 0 14px 34px rgba(0, 10, 20, 0.4), 0 0 24px rgba(41, 171, 226, 0.12);
  transform: translateY(-3px);
}
.dn-cap__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px; height: 46px;
  border-radius: 10px;
  background: rgba(41, 171, 226, 0.16);
  color: var(--c-secondary);
  box-shadow: 0 0 16px rgba(41, 171, 226, 0.25);
  margin-bottom: 16px;
}
.dn-cap__icon svg { width: 24px; height: 24px; }
.dn-cap__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: #ffffff;
}
.dn-cap__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: #9db9cd;
}

/* ==========================================================================
   合作客户
   ========================================================================== */
.dn-clients {
  background: #ffffff;
  padding: 96px 0;
}
.dn-clients__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-clients__grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
}
.dn-client {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 84px;
  background: #f7fafc;
  border: 1px solid #eef2f5;
  border-radius: 12px;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.dn-client img {
  height: 26px;
  width: auto;
  opacity: 0.6;
  transition: opacity 0.3s ease;
}
.dn-client:hover {
  border-color: rgba(41, 171, 226, 0.4);
  box-shadow: 0 8px 20px rgba(0, 40, 70, 0.06);
}
.dn-client:hover img { opacity: 1; }

/* ==========================================================================
   新闻动态
   ========================================================================== */
.dn-news {
  background: #f4f9fc;
  padding: 104px 0;
}
.dn-news__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-news__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.dn-news-card {
  display: flex;
  flex-direction: column;
  background: #ffffff;
  border: 1px solid #eef2f5;
  border-radius: 14px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.dn-news-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 18px 44px rgba(0, 40, 70, 0.1);
  border-color: rgba(41, 171, 226, 0.4);
}
.dn-news-card__media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #eef2f6;
}
.dn-news-card__media img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.dn-news-card:hover .dn-news-card__media img { transform: scale(1.06); }
.dn-news-card__body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 22px 26px 26px;
}
.dn-news-card__tag {
  align-self: flex-start;
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--c-secondary);
  background: rgba(41, 171, 226, 0.12);
  padding: 5px 12px;
  border-radius: 4px;
}
.dn-news-card__tag--industry { color: #0e8ad0; background: rgba(14, 138, 208, 0.12); }
.dn-news-card__title {
  margin: 0 0 20px;
  font-size: 18px;
  line-height: 1.55;
  font-weight: 700;
  color: #0b1c2c;
  flex: 1;
}
.dn-news-card__more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-primary);
}
.dn-news-card__more svg { transition: transform 0.25s ease; }
.dn-news-card:hover .dn-news-card__more { color: var(--c-secondary); }
.dn-news-card:hover .dn-news-card__more svg { transform: translateX(4px); }

/* ==========================================================================
   CTA 区
   ========================================================================== */
.dn-cta {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #003a66 0%, #002a48 55%, #001c30 100%);
  padding: 48px 0;
}
.dn-cta__inner {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}
.dn-cta__content { flex: 1; }
.dn-cta__title {
  margin: 0 0 10px;
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.5px;
}
.dn-cta__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: #b8cfe0;
}
.dn-cta__actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  flex-shrink: 0;
}
.dn-cta__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: #9db9cd;
  text-decoration: none;
  transition: color 0.25s ease;
}
.dn-cta__link:hover { color: var(--c-secondary); }

/* ==========================================================================
   页脚
   ========================================================================== */
.dn-footer {
  background: #0b0d10;
  color: #9db4c4;
  padding: 72px 0 28px;
}
.dn-footer__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.3fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.dn-footer__logo {
  height: 32px;
  width: auto;
  margin-bottom: 20px;
}
.dn-footer__desc {
  margin: 0;
  max-width: 320px;
  font-size: 14px;
  line-height: 1.8;
  color: #8097a8;
}
.dn-footer__title {
  margin: 0 0 18px;
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
}
.dn-footer__col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.dn-footer__col a {
  display: block;
  padding: 6px 0;
  font-size: 14px;
  color: #8097a8;
  text-decoration: none;
  transition: color 0.25s ease;
}
.dn-footer__col a:hover { color: var(--c-secondary); }
.dn-footer__addr {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: #8097a8;
}
.dn-footer__bottom {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-top: 24px;
  font-size: 13px;
  color: #5f7284;
}
.dn-footer__bottom a {
  color: #5f7284;
  text-decoration: none;
  transition: color 0.25s ease;
}
.dn-footer__bottom a:hover { color: var(--c-secondary); }

/* ==========================================================================
   右侧浮动条 + 弹窗
   ========================================================================== */
.dn-float {
  position: fixed;
  right: 20px;
  bottom: 40px;
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.dn-float__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  width: 58px;
  padding: 12px 6px;
  background: #ffffff;
  border: 1px solid #eef2f5;
  border-radius: 10px;
  box-shadow: 0 6px 20px rgba(0, 40, 70, 0.1);
  color: #33566e;
  cursor: pointer;
  transition: color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.dn-float__item svg { width: 22px; height: 22px; }
.dn-float__item span { font-size: 12px; }
.dn-float__item:hover {
  color: var(--c-secondary);
  border-color: rgba(41, 171, 226, 0.45);
  box-shadow: 0 8px 24px rgba(41, 171, 226, 0.15);
}
.dn-float__top { color: #8097a8; }

/* 弹窗 */
.dn-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 20, 40, 0.6);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.dn-modal.is-active { display: flex; }
.dn-modal__box {
  position: relative;
  width: 100%;
  max-width: 340px;
  background: #ffffff;
  border-radius: 14px;
  padding: 36px 28px 30px;
  text-align: center;
  animation: dnModalIn 0.25s ease;
}
@keyframes dnModalIn {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
.dn-modal__close {
  position: absolute;
  top: 12px; right: 12px;
  width: 44px; height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 0;
  color: #8097a8;
  cursor: pointer;
  border-radius: 8px;
  transition: color 0.2s ease, background 0.2s ease;
}
.dn-modal__close:hover { color: #0b1c2c; background: #f0f4f7; }
.dn-modal__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px; height: 56px;
  border-radius: 50%;
  margin-bottom: 16px;
}
.dn-modal__icon svg { width: 28px; height: 28px; }
.dn-modal__icon--phone { background: rgba(41, 171, 226, 0.12); color: var(--c-secondary); }
.dn-modal__icon--wechat { background: rgba(46, 178, 91, 0.12); color: #2eb25b; }
.dn-modal__title {
  margin: 0 0 14px;
  font-size: 20px;
  font-weight: 700;
  color: #0b1c2c;
}
.dn-modal__phone {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--c-primary);
  text-decoration: none;
  margin-bottom: 8px;
}
.dn-modal__note {
  margin: 0 0 22px;
  font-size: 13px;
  color: #8097a8;
}
.dn-modal__btn { width: 100%; }
.dn-modal__qrcode {
  display: block;
  width: 160px; height: 160px;
  margin: 0 auto 14px;
  border: 1px solid #eef2f5;
  border-radius: 10px;
  object-fit: contain;
}

/* 移动端：浮动条转底部横条 */
@media (max-width: 768px) {
  .dn-float {
    left: 0; right: 0; bottom: 0; top: auto;
    transform: none;
    flex-direction: row;
    gap: 12px;
    background: #ffffff;
    border-top: 1px solid #eef2f5;
    box-shadow: 0 -4px 16px rgba(0, 40, 70, 0.08);
    padding: 10px 12px calc(10px + env(safe-area-inset-bottom));
  }
  .dn-float__item {
    flex: 1;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: auto;
    height: 46px;
    padding: 0;
    border: 0;
    border-radius: 23px;
    box-shadow: none;
  }
  .dn-float__item svg { width: 20px; height: 20px; }
  .dn-float__item span { font-size: 15px; font-weight: 700; }
  .dn-float__item#openPhone {
    background: var(--c-primary);
    color: #ffffff;
  }
  .dn-float__item#openWechat {
    background: #07c160;
    color: #ffffff;
  }
  .dn-float__item:hover {
    color: #ffffff;
    border-color: transparent;
    box-shadow: none;
  }
  .dn-float__top { display: none; }
  .dn-cta__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }
}

/* ==========================================================================
   内页 Hero（新闻等）
   ========================================================================== */
.dn-page-hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(150deg, #001c30 0%, #002a48 55%, #001c30 100%);
  padding: 148px 0 72px;
}
.dn-page-hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: url('../img/circuit.svg');
  background-size: 220px 220px;
  opacity: 0.08;
}
.dn-page-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}
.dn-page-hero__title {
  margin: 0 0 14px;
  font-size: clamp(34px, 4.5vw, 50px);
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.5px;
}
.dn-page-hero__desc {
  margin: 0;
  font-size: 16px;
  color: #9db9cd;
}
.dn-page-hero__crumb {
  display: inline-block;
  margin-bottom: 18px;
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--c-secondary);
}
.dn-page-hero__meta {
  margin-top: 18px;
  font-size: 14px;
  color: #8097a8;
}
.dn-page-hero__title--article {
  font-size: clamp(26px, 3.6vw, 40px);
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
}

/* 内页 Hero 浮动光点 */
.dn-page-hero__particles {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  overflow: hidden;
}
.dn-page-hero__particles span {
  position: absolute;
  bottom: -12px;
  border-radius: 50%;
  background: var(--c-secondary);
  box-shadow: 0 0 9px var(--c-secondary);
  opacity: 0;
  animation-name: dnFloatUp;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}
@keyframes dnFloatUp {
  0%   { transform: translateY(0) translateX(0); opacity: 0; }
  10%  { opacity: 0.85; }
  80%  { opacity: 0.35; }
  100% { transform: translateY(-420px) translateX(26px); opacity: 0; }
}

/* ==========================================================================
   新闻列表页
   ========================================================================== */
.dn-news-page {
  background: #ffffff;
  padding: 64px 0 104px;
}
.dn-news-page__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-news-tabs {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 44px;
}
.dn-news-tab {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 9px 24px;
  border-radius: 20px;
  border: 1px solid #e0e8ee;
  background: #ffffff;
  color: #33566e;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}
.dn-news-tab:hover {
  color: var(--c-primary);
  border-color: rgba(41, 171, 226, 0.4);
}
.dn-news-tab.is-active {
  background: var(--c-primary);
  color: #ffffff;
  border-color: var(--c-primary);
}
.dn-news-card__excerpt {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.75;
  color: #6b7d8c;
}
.dn-news-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
  color: #8097a8;
}

/* ==========================================================================
   新闻详情页
   ========================================================================== */
.dn-article {
  background: #ffffff;
  padding: 72px 0 104px;
}
.dn-article__inner {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 24px;
  font-size: 16px;
  line-height: 1.95;
  color: #33566e;
}
.dn-article__inner p {
  margin: 0 0 22px;
}
.dn-article__inner h2 {
  margin: 36px 0 16px;
  font-size: 22px;
  font-weight: 700;
  color: #0b1c2c;
}
.dn-article__back {
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid #eef2f5;
}

/* Hero 元信息分隔点 */
.dn-page-hero__meta-dot {
  margin: 0 10px;
  color: #5c7a92;
}

/* 文章标签 */
.dn-article__tags {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 40px;
  padding-top: 26px;
  border-top: 1px solid #eef2f5;
}
.dn-article__tags-label {
  font-size: 13px;
  font-weight: 600;
  color: #8097a8;
  margin-right: 4px;
}
.dn-article__tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: 16px;
  background: #f2f7fa;
  border: 1px solid #e3ecf2;
  font-size: 13px;
  color: #33566e;
  text-decoration: none;
  transition: color 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}
.dn-article__tag:hover {
  color: var(--c-primary);
  border-color: rgba(41, 171, 226, 0.4);
  background: #eaf5fb;
}

/* 相关阅读 */
.dn-article-related {
  background: #f5f8fa;
  padding: 72px 0 96px;
}
.dn-article-related__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-article-related__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 36px;
}
.dn-article-related__title {
  margin: 0;
  font-size: 26px;
  font-weight: 800;
  color: #0b1c2c;
  letter-spacing: -0.3px;
}
.dn-article-related__more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-primary);
  text-decoration: none;
  transition: color 0.25s ease;
}
.dn-article-related__more svg { transition: transform 0.25s ease; }
.dn-article-related__more:hover { color: var(--c-secondary); }
.dn-article-related__more:hover svg { transform: translateX(4px); }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 992px) {
  .dn-about__caps { grid-template-columns: 1fr; }
  .dn-lang__btn { min-height: 44px; }
  .dn-hero__inner { padding-bottom: 84px; }
  .dn-hero__content { max-width: 560px; }
  .dn-hero__title { font-size: clamp(44px, 12vw, 68px); }
  .dn-products__grid { grid-template-columns: 1fr; }
  .dn-solutions__grid { grid-template-columns: 1fr; }
  .dn-about__inner { grid-template-columns: 1fr; gap: 40px; }
  .dn-clients__grid { grid-template-columns: repeat(3, 1fr); }
  .dn-news__grid { grid-template-columns: 1fr; }
  .dn-footer__grid { grid-template-columns: 1fr 1fr; }

  /* 移动端菜单 */
  .dn-nav__menu {
    position: absolute;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #ffffff;
    padding: 12px 24px 20px;
    box-shadow: 0 20px 40px rgba(0, 20, 40, 0.15);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
  }
  .dn-nav__menu a {
    color: #33566e;
    font-size: 16px;
    padding: 14px 4px;
    border-bottom: 1px solid #eef3f7;
  }
  .dn-nav__menu a:last-child { border-bottom: 0; }
  .dn-nav__menu a.is-active,
  .dn-nav__menu a:hover { color: var(--c-primary); }
  .dn-nav__menu a::after { display: none; }

  .dn-nav.is-open .dn-nav__menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  .dn-nav__toggle { display: flex; }
  .dn-nav__actions .dn-lang { display: none; }
  .dn-nav__lang { display: block; }
  .dn-nav__lang .dn-nav__lang-opts a {
    flex: 1;
    padding: 12px 10px;
    text-align: center;
    border: 1px solid #dce5ec;
    border-bottom: 1px solid #dce5ec;
    border-radius: 8px;
    font-size: 15px;
    line-height: 1.4;
    color: #33566e;
  }
  .dn-nav__lang .dn-nav__lang-opts a.is-active {
    background: var(--c-primary);
    border-color: var(--c-primary);
    color: #ffffff;
  }
  .dn-nav__lang .dn-nav__lang-opts a:last-child {
    border-bottom: 1px solid #dce5ec;
  }

  .dn-nav.is-open .dn-nav__toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .dn-nav.is-open .dn-nav__toggle span:nth-child(2) { opacity: 0; }
  .dn-nav.is-open .dn-nav__toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

@media (max-width: 600px) {
  .dn-nav__cta { display: none; }
  .dn-hero__desc { font-size: 15px; }
  .dn-hero__actions .dn-btn { flex: 1; }
  .dn-hero__specs { gap: 10px 18px; }
  .dn-hero__vf { display: none; }
  .dn-hero__arrow { display: none; }
  .dn-clients__grid { grid-template-columns: repeat(2, 1fr); }
  .dn-footer__grid { grid-template-columns: 1fr; }
  .dn-article-related { padding: 56px 0 72px; }
  .dn-article-related__title { font-size: 22px; }
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .dn-hero__scan,
  .dn-hero__particles span,
  .dn-page-hero__particles span,
  .dn-hero__circuit,
  .dn-hero .dn-btn--primary { animation: none; }
}

/* ==========================================================================
   内页通用：深色区块浅色标题
   ========================================================================== */
.dn-sec-head__kicker--light { color: var(--c-secondary); }
.dn-sec-head__title--light { color: #ffffff; }

/* ==========================================================================
   产品列表页
   ========================================================================== */
.dn-products--page { padding-bottom: 64px; }
.dn-product--soon {
  opacity: 0.78;
  cursor: default;
}
.dn-product--soon:hover {
  transform: none;
  box-shadow: none;
  border-color: #eef2f5;
}
.dn-product--soon .dn-product__media img { filter: grayscale(0.2); }
.dn-product__more--muted {
  color: #9db4c4;
  font-weight: 600;
}

/* 产品列表页 — 单行大卡片 */
.dn-products__grid--page {
  grid-template-columns: 1fr;
  gap: 30px;
}
.dn-products--page .dn-product--row {
  flex-direction: row;
  align-items: stretch;
  border-radius: 18px;
}
.dn-products--page .dn-product--row .dn-product__media {
  flex: 0 0 44%;
  aspect-ratio: auto;
  min-height: 340px;
  background: linear-gradient(135deg, #eaf4fb 0%, #f6fafd 100%);
}
.dn-products--page .dn-product--row .dn-product__body {
  flex: 1;
  position: relative;
  justify-content: center;
  padding: 44px 56px;
}
.dn-product__index {
  position: absolute;
  top: 22px;
  right: 32px;
  font-family: var(--font-mono);
  font-size: 84px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -2px;
  color: rgba(0, 58, 102, 0.07);
  transition: color 0.3s ease;
  pointer-events: none;
}
.dn-product:hover .dn-product__index { color: rgba(41, 171, 226, 0.3); }
.dn-product__tag {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--c-secondary);
}
.dn-product__tag::before {
  content: "";
  width: 22px;
  height: 2px;
  margin-right: 10px;
  background: var(--c-secondary);
}
.dn-products--page .dn-product--row .dn-product__name {
  margin-bottom: 14px;
  font-size: clamp(30px, 4vw, 40px);
}
.dn-products--page .dn-product--row .dn-product__desc {
  flex: none;
  margin-bottom: 26px;
  font-size: 16px;
  max-width: 520px;
}

@media (max-width: 992px) {
  .dn-products--page .dn-product--row { flex-direction: column; }
  .dn-products--page .dn-product--row .dn-product__media {
    flex: none;
    width: 100%;
    aspect-ratio: 16 / 10;
    min-height: 0;
  }
  .dn-products--page .dn-product--row .dn-product__body {
    padding: 28px 26px 30px;
  }
  .dn-product__index {
    top: 20px;
    right: 24px;
    font-size: 60px;
  }
}

/* 规格入口 */
.dn-spec-entry {
  background: #f4f9fc;
  padding: 96px 0;
}
.dn-spec-entry__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-spec-entry__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.dn-spec-entry__card {
  display: flex;
  flex-direction: column;
  background: #ffffff;
  border: 1px solid #eef2f5;
  border-radius: 14px;
  padding: 34px 30px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.dn-spec-entry__card:hover {
  transform: translateY(-5px);
  box-shadow: 0 18px 44px rgba(0, 40, 70, 0.1);
  border-color: rgba(41, 171, 226, 0.45);
}
.dn-spec-entry__card--muted { cursor: default; }
.dn-spec-entry__card--muted:hover {
  transform: none;
  box-shadow: none;
  border-color: #eef2f5;
}
.dn-spec-entry__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px; height: 52px;
  border-radius: 12px;
  background: rgba(41, 171, 226, 0.14);
  color: var(--c-secondary);
  margin-bottom: 22px;
}
.dn-spec-entry__icon svg { width: 26px; height: 26px; }
.dn-spec-entry__title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 700;
  color: #0b1c2c;
}
.dn-spec-entry__desc {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.8;
  color: #6b7d8c;
  flex: 1;
}
.dn-spec-entry__link {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-primary);
}
.dn-spec-entry__card--muted .dn-spec-entry__link { color: #9db4c4; }

/* ==========================================================================
   产品详情页
   ========================================================================== */
.dn-pd-hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(150deg, #001c30 0%, #002a48 55%, #001c30 100%);
  padding: 148px 0 88px;
}
.dn-pd-hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: url('../img/circuit.svg');
  background-size: 220px 220px;
  opacity: 0.08;
  -webkit-mask-image: radial-gradient(80% 90% at 78% 50%, #000 0%, transparent 100%);
  mask-image: radial-gradient(80% 90% at 78% 50%, #000 0%, transparent 100%);
}
.dn-pd-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}
.dn-pd-hero__tag {
  display: inline-block;
  margin-bottom: 18px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--c-secondary);
}
.dn-pd-hero__title {
  margin: 0 0 14px;
  font-size: clamp(40px, 5vw, 60px);
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -1px;
}
.dn-pd-hero__title span { color: var(--c-secondary); }
.dn-pd-hero__slogan {
  margin: 0 0 16px;
  font-size: 19px;
  font-weight: 600;
  color: #cfe6f5;
}
.dn-pd-hero__desc {
  margin: 0 0 30px;
  font-size: 16px;
  line-height: 1.85;
  color: #9db9cd;
  max-width: 520px;
}
.dn-pd-hero__actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
.dn-pd-hero__link {
  font-size: 14px;
  font-weight: 600;
  color: #9db9cd;
  text-decoration: none;
  transition: color 0.25s ease;
}
.dn-pd-hero__link:hover { color: var(--c-secondary); }
.dn-pd-hero__media {
  position: relative;
}
.dn-pd-hero__media img {
  width: 100%;
  border-radius: 16px;
  box-shadow: 0 30px 70px rgba(0, 8, 18, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* 图文区通用（产品概述 / 方案介绍 / 公司简介） */
.dn-pd-intro,
.dn-sd-intro,
.dn-ab-intro {
  background: #ffffff;
  padding: 96px 0;
}
.dn-pd-intro__inner,
.dn-sd-intro__inner,
.dn-ab-intro__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.dn-pd-intro__media img,
.dn-sd-intro__media img,
.dn-ab-intro__media img {
  width: 100%;
  border-radius: 14px;
  box-shadow: 0 20px 46px rgba(0, 40, 70, 0.1);
}
.dn-pd-intro__title,
.dn-sd-intro__title,
.dn-ab-intro__title {
  margin: 16px 0 18px;
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 800;
  color: #0b1c2c;
  letter-spacing: -0.5px;
}
.dn-pd-intro__text,
.dn-sd-intro__text,
.dn-ab-intro__lead,
.dn-ab-intro__text {
  font-size: 15px;
  line-height: 1.9;
  color: #6b7d8c;
  margin: 0 0 14px;
}
.dn-ab-intro__lead {
  font-size: 17px;
  font-weight: 600;
  color: #33566e;
  margin-bottom: 14px;
}
.dn-pd-intro__list,
.dn-sd-intro__points {
  list-style: none;
  margin: 0 0 30px;
  padding: 0;
}
.dn-pd-intro__list li,
.dn-sd-intro__points li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 12px;
  font-size: 15px;
  line-height: 1.7;
  color: #33566e;
}
.dn-pd-intro__list li::before,
.dn-sd-intro__points li::before {
  content: "";
  position: absolute;
  left: 0; top: 9px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--c-secondary);
  box-shadow: 0 0 10px rgba(41, 171, 226, 0.6);
}
.dn-pd-intro__actions,
.dn-sd-intro__actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* 系统组成 */
.dn-pd-sys {
  background: #f4f9fc;
  padding: 96px 0;
}
.dn-pd-sys__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-pd-sys__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.dn-pd-sys__card {
  background: #ffffff;
  border: 1px solid #eef2f5;
  border-radius: 14px;
  padding: 30px 26px;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.dn-pd-sys__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 38px rgba(0, 40, 70, 0.08);
  border-color: rgba(41, 171, 226, 0.4);
}
.dn-pd-sys__media {
  aspect-ratio: 16 / 10;
  border-radius: 10px;
  overflow: hidden;
  background: #eef2f6;
  margin-bottom: 18px;
}
.dn-pd-sys__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.dn-pd-sys__card:hover .dn-pd-sys__media img { transform: scale(1.06); }
.dn-pd-sys__title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: #0b1c2c;
}
.dn-pd-sys__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: #6b7d8c;
}

/* 核心亮点 */
.dn-pd-highlight {
  position: relative;
  overflow: hidden;
  background: linear-gradient(150deg, #001c30 0%, #002a48 52%, #001c30 100%);
  padding: 96px 0;
}
.dn-pd-highlight__inner {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-pd-highlight .dn-sec-head__title { color: #ffffff; }
.dn-pd-highlight .dn-sec-head__desc { color: #9db9cd; }
.dn-pd-highlight__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}
.dn-pd-highlight__card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 14px;
  padding: 0;
  overflow: hidden;
  backdrop-filter: blur(4px);
  transition: border-color 0.3s ease, transform 0.3s ease;
}
.dn-pd-highlight__card:hover {
  border-color: rgba(41, 171, 226, 0.5);
  transform: translateY(-3px);
}
.dn-pd-highlight__media {
  aspect-ratio: 16 / 7;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.04);
}
.dn-pd-highlight__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.dn-pd-highlight__card:hover .dn-pd-highlight__media img { transform: scale(1.05); }
.dn-pd-highlight__body {
  padding: 24px 26px 26px;
}
.dn-pd-highlight__num {
  display: block;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--c-secondary);
}
.dn-pd-highlight__title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
}
.dn-pd-highlight__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: #9db9cd;
}

/* 关键参数 */
.dn-pd-specs {
  background: #ffffff;
  padding: 96px 0;
}
.dn-pd-specs__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-pd-specs__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}
.dn-pd-spec {
  background: #f4f9fc;
  border: 1px solid #eef2f5;
  border-radius: 12px;
  padding: 28px 24px;
  text-align: center;
}
.dn-pd-spec__value {
  display: block;
  margin-bottom: 8px;
  font-size: 24px;
  font-weight: 800;
  color: var(--c-primary);
}
.dn-pd-spec__label {
  font-size: 13px;
  color: #6b7d8c;
}
.dn-pd-spec-group { margin-bottom: 36px; }
.dn-pd-spec-group:last-child { margin-bottom: 40px; }
.dn-pd-spec-group__title {
  margin: 0 0 18px;
  font-size: 17px;
  font-weight: 700;
  color: #0b1c2c;
  padding-left: 12px;
  border-left: 3px solid var(--c-secondary);
}
.dn-pd-spec-group .dn-pd-specs__grid { margin-bottom: 0; }
.dn-pd-specs__actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* 应用场景 */
.dn-pd-app {
  background: #f4f9fc;
  padding: 96px 0;
}
.dn-pd-app__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   解决方案列表页
   ========================================================================== */
.dn-solutions--page { background: #ffffff; }
.dn-solution--link {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}
.dn-solution__more {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 18px;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-primary);
}
.dn-solution__more svg { transition: transform 0.25s ease; }
.dn-solution--link:hover .dn-solution__more { color: var(--c-secondary); }
.dn-solution--link:hover .dn-solution__more svg { transform: translateX(4px); }

/* 方案详情：其他方案 */
.dn-sd-others {
  background: #f4f9fc;
  padding: 96px 0;
}
.dn-sd-others__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* 方案详情：场景需求（痛点） */
.dn-sd-pains {
  background: #f4f9fc;
  padding: 96px 0;
}
.dn-sd-pains__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-sd-pains__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.dn-sd-pain {
  background: #ffffff;
  border: 1px solid #eef2f5;
  border-radius: 14px;
  overflow: hidden;
}
.dn-sd-pain__media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #eef2f6;
}
.dn-sd-pain__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.dn-sd-pain__body {
  padding: 20px 22px 22px;
}
.dn-sd-pain__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: #0b1c2c;
}
.dn-sd-pain__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: #33566e;
}

/* 方案详情：解决方案（视频） */
.dn-sd-video {
  background: #ffffff;
  padding: 96px 0;
}
.dn-sd-video__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-sd-media-image {
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 16px 40px rgba(0, 40, 70, 0.1);
}
.dn-sd-media-image img { width: 100%; display: block; }

/* 方案详情：方案价值 */
.dn-sd-values {
  background: linear-gradient(150deg, #001c30 0%, #002a48 55%, #001c30 100%);
  padding: 96px 0;
}
.dn-sd-values__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-sd-values .dn-sec-head__title { color: #ffffff; }
.dn-sd-values .dn-sec-head__desc { color: #9db9cd; }
.dn-sd-values__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.dn-sd-value {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 14px;
  overflow: hidden;
}
.dn-sd-value__media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}
.dn-sd-value__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.dn-sd-value__body {
  padding: 20px 22px 22px;
}
.dn-sd-value__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
}
.dn-sd-value__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: #c6d9e8;
}

/* 方案详情：关联产品 */
.dn-sd-products {
  background: #ffffff;
  padding: 96px 0;
}
.dn-sd-products__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-sd-products__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}
.dn-sd-product {
  display: flex;
  flex-direction: column;
  background: #ffffff;
  border: 1px solid #eef2f5;
  border-radius: 14px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.dn-sd-product:hover {
  transform: translateY(-6px);
  box-shadow: 0 22px 50px rgba(0, 40, 70, 0.12);
  border-color: rgba(41, 171, 226, 0.45);
}
.dn-sd-product__media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #eef2f6;
}
.dn-sd-product__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.dn-sd-product:hover .dn-sd-product__media img { transform: scale(1.06); }
.dn-sd-product__badge {
  position: absolute;
  top: 14px;
  left: 14px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  color: #ffffff;
  background: rgba(0, 40, 70, 0.62);
  padding: 5px 12px;
  border-radius: 4px;
  backdrop-filter: blur(4px);
}
.dn-sd-product__body {
  padding: 24px 26px 26px;
}
.dn-sd-product__name {
  margin: 0 0 10px;
  font-size: 22px;
  font-weight: 800;
  color: #0b1c2c;
}
.dn-sd-product__desc {
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.8;
  color: #6b7d8c;
}
.dn-sd-product__more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-primary);
}
.dn-sd-product__more svg { transition: transform 0.25s ease; }
.dn-sd-product:hover .dn-sd-product__more { color: var(--c-secondary); }
.dn-sd-product:hover .dn-sd-product__more svg { transform: translateX(4px); }

@media (max-width: 992px) {
  .dn-sd-pains__grid,
  .dn-sd-values__grid,
  .dn-sd-products__grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   关于我们
   ========================================================================== */
/* 企业风采 */
.dn-ab-gallery {
  background: #f4f9fc;
  padding: 96px 0;
}
.dn-ab-gallery__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-ab-gallery__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.dn-ab-gallery__item {
  margin: 0;
  background: #ffffff;
  border: 1px solid #eef2f5;
  border-radius: 14px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.dn-ab-gallery__item:hover {
  transform: translateY(-6px);
  box-shadow: 0 22px 50px rgba(0, 40, 70, 0.1);
}
.dn-ab-gallery__media {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: #eef2f6;
}
.dn-ab-gallery__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.dn-ab-gallery__item:hover .dn-ab-gallery__media img { transform: scale(1.06); }
.dn-ab-gallery__caption {
  padding: 20px 22px 22px;
}
.dn-ab-gallery__title {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 700;
  color: #0b1c2c;
}
.dn-ab-gallery__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: #6b7d8c;
}

@media (max-width: 992px) {
  .dn-ab-gallery__grid { grid-template-columns: 1fr; }
}

.dn-ab-cap__inner,
.dn-ab-value__inner {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* 发展历程 */
.dn-timeline {
  background: #ffffff;
  padding: 96px 0;
}
.dn-timeline__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-timeline__list {
  position: relative;
  max-width: 760px;
  margin: 0 auto;
}
.dn-timeline__list::before {
  content: "";
  position: absolute;
  left: 9px; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-secondary), rgba(41, 171, 226, 0.1));
}
.dn-timeline__item {
  position: relative;
  padding: 0 0 40px 44px;
}
.dn-timeline__item:last-child { padding-bottom: 0; }
.dn-timeline__dot {
  position: absolute;
  left: 0; top: 6px;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: #ffffff;
  border: 4px solid var(--c-secondary);
  box-shadow: 0 0 0 5px rgba(41, 171, 226, 0.15);
}
.dn-timeline__card {
  background: #f7fafc;
  border: 1px solid #eef2f5;
  border-radius: 12px;
  padding: 24px 26px;
}
.dn-timeline__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: #0b1c2c;
}
.dn-timeline__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: #6b7d8c;
}

/* 价值理念 */
.dn-ab-value__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.dn-value {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 14px;
  padding: 34px 30px;
  backdrop-filter: blur(4px);
  transition: border-color 0.3s ease, transform 0.3s ease;
}
.dn-value:hover {
  border-color: rgba(41, 171, 226, 0.5);
  transform: translateY(-3px);
}
.dn-value__title {
  margin: 0 0 12px;
  font-size: 22px;
  font-weight: 800;
  color: var(--c-secondary);
}
.dn-value__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: #9db9cd;
}

/* 资质荣誉 */
.dn-cred {
  background: #f4f9fc;
  padding: 96px 0;
}
.dn-cred__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-cred__grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}
.dn-cred__card {
  background: #ffffff;
  border: 1px solid #eef2f5;
  border-radius: 14px;
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}
.dn-cred__card:hover {
  border-color: rgba(41, 171, 226, 0.4);
  box-shadow: 0 16px 38px rgba(0, 40, 70, 0.08);
  transform: translateY(-3px);
}
.dn-cred__card--patent img {
  width: 100%;
  aspect-ratio: 1022 / 1461;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}
.dn-cred__card--patent:hover img { transform: scale(1.05); }

/* ==========================================================================
   联系我们
   ========================================================================== */
.dn-contact {
  background: #ffffff;
  padding: 96px 0;
}
.dn-contact__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-contact__grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
  align-items: start;
}
.dn-contact__title {
  margin: 16px 0 10px;
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 800;
  color: #0b1c2c;
  letter-spacing: -0.5px;
}
.dn-contact__sub {
  margin: 0 0 30px;
  font-size: 15px;
  color: #6b7d8c;
}
.dn-contact__cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.dn-contact__card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 22px 24px;
  background: #f7fafc;
  border: 1px solid #eef2f5;
  border-radius: 12px;
}
.dn-contact__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 44px; height: 44px;
  border-radius: 10px;
  background: rgba(41, 171, 226, 0.14);
  color: var(--c-secondary);
}
.dn-contact__icon svg { width: 22px; height: 22px; }
.dn-contact__card-title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: #0b1c2c;
}
.dn-contact__card-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: #6b7d8c;
  text-decoration: none;
}
a.dn-contact__card-desc:hover { color: var(--c-primary); }

/* 表单 */
.dn-contact__form {
  background: #f7fafc;
  border: 1px solid #eef2f5;
  border-radius: 16px;
  padding: 38px 36px;
}
.dn-contact__form-title {
  margin: 0 0 8px;
  font-size: 22px;
  font-weight: 800;
  color: #0b1c2c;
}
.dn-contact__form-sub {
  margin: 0 0 28px;
  font-size: 14px;
  color: #6b7d8c;
}
.dn-form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.dn-form__field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 18px;
}
.dn-form__field label {
  font-size: 14px;
  font-weight: 600;
  color: #33566e;
}
.dn-form__field label span { color: #e53935; }
.dn-form__field input,
.dn-form__field select,
.dn-form__field textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid #dce5ec;
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  color: #17354d;
  background: #ffffff;
  outline: none;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.dn-form__field input:focus,
.dn-form__field select:focus,
.dn-form__field textarea:focus {
  border-color: var(--c-secondary);
  box-shadow: 0 0 0 3px rgba(41, 171, 226, 0.15);
}
.dn-form__field textarea { resize: vertical; }
.dn-form__feedback {
  min-height: 22px;
  margin-bottom: 6px;
  font-size: 14px;
  line-height: 1.5;
}
.dn-form__feedback.is-error { color: #e53935; }
.dn-form__feedback.is-success { color: #1b9e6b; }
.dn-form__submit { width: 100%; }

/* ==========================================================================
   内页响应式
   ========================================================================== */
@media (max-width: 992px) {
  .dn-pd-hero__inner { grid-template-columns: 1fr; gap: 40px; }
  .dn-pd-hero__media { order: -1; }
  .dn-pd-hero__media img { max-width: 560px; margin: 0 auto; }
  .dn-pd-intro__inner,
  .dn-sd-intro__inner,
  .dn-ab-intro__inner { grid-template-columns: 1fr; gap: 36px; }
  .dn-pd-sys__grid { grid-template-columns: repeat(2, 1fr); }
  .dn-pd-highlight__grid { grid-template-columns: 1fr; }
  .dn-pd-specs__grid { grid-template-columns: repeat(2, 1fr); }
  .dn-spec-entry__grid { grid-template-columns: 1fr; }
  .dn-contact__grid { grid-template-columns: 1fr; gap: 40px; }
  .dn-cred__grid { grid-template-columns: repeat(3, 1fr); }
  .dn-ab-value__grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .dn-pd-sys__grid { grid-template-columns: 1fr; }
  .dn-pd-specs__grid { grid-template-columns: 1fr; }
  .dn-form__row { grid-template-columns: 1fr; }
  .dn-contact__form { padding: 28px 22px; }
  .dn-pd-hero__actions .dn-btn { flex: 1; }
  .dn-cred__grid { grid-template-columns: repeat(2, 1fr); }
}

/* ==========================================================================
   产品视频
   ========================================================================== */
.dn-pd-video {
  background: #ffffff;
  padding: 0 0 96px;
}
.dn-pd-video__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.dn-pd-video__frame {
  position: relative;
  display: block;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 0;
  border: 0;
  border-radius: 16px;
  overflow: hidden;
  cursor: pointer;
  background: #001c30;
  aspect-ratio: 16 / 9;
}
.dn-pd-video__frame img {
  width: 100%; height: 100%;
  object-fit: cover;
  opacity: 0.82;
  transition: transform 0.5s ease, opacity 0.3s ease;
}
.dn-pd-video__frame:hover img { transform: scale(1.03); opacity: 1; }
.dn-pd-video__frame--video {
  cursor: default;
}
.dn-pd-video__frame--video video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.dn-pd-video__empty {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 0 24px;
  font-size: 15px;
  color: #9db9cd;
  text-align: center;
}
.dn-pd-video__bigplay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 0;
  padding: 0;
  background: transparent;
  cursor: pointer;
  color: #ffffff;
  z-index: 1;
}
.dn-pd-video__bigplay::before {
  content: "";
  position: absolute;
  width: 92px;
  height: 92px;
  border-radius: 50%;
  background: rgba(41, 171, 226, 0.92);
  box-shadow: 0 0 0 0 rgba(41, 171, 226, 0.55);
  animation: dnVideoPulse 2.2s infinite;
}
.dn-pd-video__bigplay svg {
  position: relative;
  z-index: 1;
  transform: translateX(3px);
}
.dn-pd-video__bigplay.is-hidden { display: none; }
.dn-pd-video__play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
}
.dn-pd-video__play::before {
  content: "";
  position: absolute;
  width: 86px; height: 86px;
  border-radius: 50%;
  background: rgba(41, 171, 226, 0.92);
  box-shadow: 0 0 0 0 rgba(41, 171, 226, 0.55);
  animation: dnVideoPulse 2.2s infinite;
}
.dn-pd-video__play svg {
  position: relative;
  z-index: 1;
  transform: translateX(2px);
}
@keyframes dnVideoPulse {
  0%   { box-shadow: 0 0 0 0 rgba(41, 171, 226, 0.55); }
  70%  { box-shadow: 0 0 0 18px rgba(41, 171, 226, 0); }
  100% { box-shadow: 0 0 0 0 rgba(41, 171, 226, 0); }
}

/* 视频弹窗 */
.dn-modal--video { z-index: 210; }
.dn-modal__box--video {
  width: min(920px, 92vw);
  max-width: 920px;
  padding: 0;
  background: #000000;
  overflow: hidden;
}
.dn-modal__box--video video {
  width: 100%;
  display: block;
  aspect-ratio: 16 / 9;
  background: #000000;
}
.dn-modal__box--video .dn-modal__close {
  background: rgba(0, 0, 0, 0.5);
  color: #ffffff;
}
.dn-modal__box--video .dn-modal__close:hover { background: rgba(0, 0, 0, 0.7); color: #ffffff; }
.dn-modal__empty {
  padding: 64px 32px;
  text-align: center;
  color: #9db9cd;
  font-size: 15px;
  line-height: 1.8;
}
@media (max-width: 600px) {
  .dn-pd-video__play::before { width: 62px; height: 62px; }
  .dn-pd-video__play svg { width: 24px; height: 24px; }
}

/* ==========================================================================
   常见问题 FAQ
   ========================================================================== */
.dn-faq {
  background: #ffffff;
  padding: 72px 0 104px;
}
.dn-faq__inner {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 24px;
}
.dn-faq__group {
  margin-bottom: 40px;
}
.dn-faq__group:last-child {
  margin-bottom: 0;
}
.dn-faq__cat {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-size: 20px;
  font-weight: 700;
  color: #0b1c2c;
}
.dn-faq__cat::before {
  content: '';
  width: 4px;
  height: 18px;
  border-radius: 2px;
  background: var(--c-secondary);
}
.dn-faq__list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.dn-faq__item {
  border: 1px solid #eef2f5;
  border-radius: 12px;
  background: #f7fafc;
  overflow: hidden;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.dn-faq__item[open] {
  border-color: rgba(41, 171, 226, 0.4);
  box-shadow: 0 12px 30px rgba(0, 40, 70, 0.06);
}
.dn-faq__q {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 700;
  color: #0b1c2c;
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.dn-faq__q::-webkit-details-marker { display: none; }
.dn-faq__q::after {
  content: "+";
  flex-shrink: 0;
  margin-left: auto;
  width: 28px; height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(41, 171, 226, 0.12);
  color: var(--c-secondary);
  font-size: 18px;
  font-weight: 600;
  transition: transform 0.25s ease, background 0.25s ease;
}
.dn-faq__item[open] .dn-faq__q::after {
  transform: rotate(45deg);
  background: var(--c-secondary);
  color: #ffffff;
}
.dn-faq__a {
  padding: 0 24px 22px;
}
.dn-faq__a p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: #6b7d8c;
}