/* ============================================================
   蓝铸三维 LANZHU 3D —— 设计系统
   参考语言：mach42.ai（几何无衬线 + 12 栅格 + 胶囊按钮 + 暗色媒体首屏）
   配色主题：工业蓝 #1E5BA8
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root {
  /* 墨蓝系（暗色底） */
  --ink:        #0A1A2B;
  --ink-2:      #0F2537;
  --ink-3:      #14314A;
  --ink-soft:   #1B3A55;

  /* 品牌蓝 */
  --brand:      #1E5BA8;
  --brand-d:    #17457E;
  --brand-l:    #4A85CC;
  --brand-tint: #EAF1F9;
  --accent:     #35C2F0;

  /* 中性 */
  --paper:      #FFFFFF;
  --paper-2:    #F3F6FA;
  --paper-3:    #E7EEF6;
  --text:       #0F2537;
  --muted:      #5C7185;
  --muted-2:    #8399AB;
  --line:       rgba(13, 42, 72, .12);
  --line-2:     rgba(13, 42, 72, .07);
  --line-inv:   rgba(255, 255, 255, .14);

  /* 字体 */
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC',
          'HarmonyOS Sans SC', 'Microsoft YaHei', 'Noto Sans SC',
          'Hiragino Sans GB', 'Source Han Sans SC', sans-serif;
  --mono: ui-monospace, 'SF Mono', 'Cascadia Mono', Consolas, monospace;

  /* 尺度 */
  --container: 1600px;
  --pad: 20px;
  --header-pad: 16px;   /* 胶囊导航距顶部距离，滚动时整体上移这个值 */
  --radius: 3px;
  --radius-lg: 6px;

  /* 动效 */
  --ease: cubic-bezier(.22, .61, .36, 1);
  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --dur: .42s;

  /* 层级：页头必须高于移动端全屏导航，
     否则导航展开后会盖住汉堡按钮，用户无法关闭菜单 */
  --z-header: 200;
  --z-nav: 190;
}

/* ---------- 2. 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul, ol { margin: 0; padding: 0; list-style: none; }
figure { margin: 0; }
table { border-collapse: collapse; width: 100%; }

h1, h2, h3, h4, h5 {
  margin: 0;
  font-weight: 600;
  line-height: 1.24;
  letter-spacing: -.01em;
}

p { margin: 0 0 1.1em; }
p:last-child { margin-bottom: 0; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

::selection { background: var(--brand); color: #fff; }

/* 跳转到主内容（无障碍） */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 999;
  padding: 12px 20px;
  background: var(--brand);
  color: #fff;
  font-weight: 600;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- 3. 排版 ---------- */
.t-display {
  font-size: clamp(2.35rem, 5.6vw, 4.75rem);
  line-height: 1.06;
  letter-spacing: -.028em;
  font-weight: 700;
}
.t-h1 {
  font-size: clamp(2rem, 4.2vw, 3.5rem);
  line-height: 1.12;
  letter-spacing: -.024em;
  font-weight: 700;
}
.t-h2 {
  font-size: clamp(1.65rem, 3vw, 2.6rem);
  line-height: 1.2;
  letter-spacing: -.02em;
}
.t-h3 {
  font-size: clamp(1.15rem, 1.6vw, 1.5rem);
  line-height: 1.35;
  letter-spacing: -.012em;
}
.t-h4 { font-size: 1.0625rem; line-height: 1.45; font-weight: 600; }
.t-lead {
  font-size: clamp(1rem, 1.15vw, 1.1875rem);
  line-height: 1.85;
  color: var(--muted);
}
.t-body { font-size: 1rem; line-height: 1.85; color: var(--muted); }
.t-small { font-size: .875rem; line-height: 1.7; color: var(--muted); }

/* 小标签 / 眉标 */
.t-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--brand);
}
.t-eyebrow::before {
  content: '';
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: .55;
}
.t-eyebrow--inv { color: var(--accent); }

.t-num {
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum' 1;
}
.t-brand { color: var(--brand); }
.t-inv { color: #fff; }
.t-inv-muted { color: rgba(255, 255, 255, .62); }
.t-center { text-align: center; }
.t-balance { text-wrap: balance; }

/* ---------- 4. 布局 ---------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--pad);
  width: 100%;
}

.section { padding: clamp(72px, 8vw, 132px) 0; }
.section--tight { padding: clamp(52px, 5.5vw, 84px) 0; }
.section--paper { background: var(--paper); }
.section--soft { background: var(--paper-2); }
.section--ink {
  background: var(--ink);
  color: #fff;
}
.section--ink .t-lead,
.section--ink .t-body,
.section--ink .t-small { color: rgba(255, 255, 255, .7); }
.section--hairline { border-top: 1px solid var(--line); }

.grid { display: grid; gap: 24px; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* 版块标题区 */
.section-head { max-width: 820px; }
.section-head--wide { max-width: 1080px; }
.section-head--center { margin: 0 auto; text-align: center; }
.section-head .t-h2 { margin: 18px 0 0; }
.section-head .t-lead { margin-top: 20px; }

.section-head--split {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 48px;
  align-items: end;
  max-width: none;
}
.section-head--split .t-lead { margin-top: 0; }

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  height: 50px;
  padding: 0 26px;
  border-radius: 999px;
  font-size: .9375rem;
  font-weight: 600;
  letter-spacing: .01em;
  white-space: nowrap;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}
.btn--pill {
  background: var(--brand);
  color: #fff;
}
.btn--pill:hover {
  background: var(--brand-d);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px -12px rgba(30, 91, 168, .7);
}
.btn--ghost {
  border: 1.5px solid var(--line-inv);
  color: #fff;
}
.btn--ghost:hover {
  border-color: rgba(255, 255, 255, .55);
  background: rgba(255, 255, 255, .07);
  transform: translateY(-2px);
}
.btn--outline {
  border: 1.5px solid var(--brand);
  color: var(--brand);
}
.btn--outline:hover {
  background: var(--brand);
  color: #fff;
  transform: translateY(-2px);
}
.btn--lg { height: 58px; padding: 0 34px; font-size: 1rem; }
.btn--block { width: 100%; }

.btn__arrow {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(255, 255, 255, .2);
  flex: none;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}
.btn:hover .btn__arrow { transform: translateX(3px); background: rgba(255, 255, 255, .34); }
.btn--outline .btn__arrow { background: rgba(30, 91, 168, .12); }
.btn--outline:hover .btn__arrow { background: rgba(255, 255, 255, .24); }

.btn-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 600;
  font-size: .9375rem;
  color: var(--brand);
}
.link-arrow svg { transition: transform var(--dur) var(--ease); }
.link-arrow:hover svg { transform: translateX(4px); }
.section--ink .link-arrow { color: var(--accent); }

/* ---------- 6. 页头 ----------
   对齐参考站 mach42.ai 的做法：导航整体是一枚悬浮的白色胶囊。
   向下滚动后 LOGO 淡出、胶囊上移吸顶，只留下导航本身——
   这样它在暗色首屏和白色内容区上都始终清晰可读。
   ------------------------------------------------------------ */
.l-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-header);
  padding-top: var(--header-pad, 16px);
  transition: transform .22s var(--ease);
}
.has-scrolled .l-header { transform: translateY(calc(-1 * var(--header-pad, 16px))); }

.l-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

/* 品牌锁定：图形标识 + 中英文字标 */
.l-header__logo {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  flex: none;
  transition: opacity .2s var(--ease);
}
.has-scrolled:not(.nav-is-active) .l-header__logo { opacity: 0; pointer-events: none; }
.l-header__logo svg { width: 36px; height: 36px; display: block; flex: none; }
.l-header__wordmark {
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.1;
}
.l-header__wordmark small {
  display: block;
  font-size: .5rem;
  font-weight: 500;
  letter-spacing: .15em;
  color: rgba(255, 255, 255, .6);
  text-transform: uppercase;
  margin-top: 4px;
  white-space: nowrap;
}

/* 白色胶囊导航 */
.l-header__nav {
  display: flex;
  align-items: center;
  height: 60px;
  padding: 0 15px 0 32px;
  background: #fff;
  border-radius: 60px;
  box-shadow: 0 3px 12px rgba(13, 42, 72, .16);
  flex: none;
}
.l-header__menu { display: flex; align-items: center; }
.l-header__menu > li { position: relative; }
.l-header__menu > li + li { margin-left: 30px; }
.l-header__menu a {
  display: block;
  padding: 6px 0;
  color: #525E6B;
  font-size: .9375rem;
  font-weight: 500;
  white-space: nowrap;
  transition: color .3s var(--ease);
}
.l-header__menu a:hover { color: #000; }
.l-header__menu .is-current > a { color: var(--brand); font-weight: 600; }
.l-header__nav .btn--pill { margin-left: 25px; height: 42px; padding: 0 20px; font-size: .875rem; }

/* 下拉二级菜单 */
.l-header__sub-menu__wrap {
  position: absolute;
  left: 50%;
  top: 100%;
  padding-top: 24px;
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(-8px);
  transition: opacity .3s var(--ease), transform .3s var(--ease), visibility .3s;
}
.l-header__menu > li:hover .l-header__sub-menu__wrap,
.l-header__menu > li:focus-within .l-header__sub-menu__wrap {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.l-header__sub-menu {
  position: relative;
  min-width: 180px;
  padding: 12px 10px;
  background: #fff;
  border-radius: 6px;
  box-shadow: 0 10px 30px rgba(13, 42, 72, .2);
}
.l-header__sub-menu::before {
  content: '';
  position: absolute;
  top: -7px;
  left: 0;
  right: 0;
  margin: 0 auto;
  width: 0;
  height: 0;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  border-bottom: 8px solid #fff;
}
.l-header__sub-menu a {
  padding: 9px 16px;
  border-radius: 4px;
  font-size: .875rem;
  color: #525E6B;
}
.l-header__sub-menu a:hover { background: var(--brand-tint); color: var(--brand-d); }

/* 汉堡按钮：品牌蓝圆底，保证在浅色内容区上也清晰可见 */
.c-burger {
  display: none;
  width: 48px;
  height: 48px;
  padding: 14px 12px;
  flex-direction: column;
  justify-content: space-between;
  flex: none;
  background: var(--brand);
  border-radius: 50%;
  box-shadow: 0 4px 16px rgba(13, 42, 72, .3);
  transition: background .3s var(--ease);
}
.c-burger:hover { background: var(--brand-d); }
.c-burger span {
  display: block;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform .3s var(--ease), opacity .2s var(--ease);
}
.c-burger[aria-expanded='true'] span:nth-child(1) { transform: translateY(9px) rotate(45deg); }
.c-burger[aria-expanded='true'] span:nth-child(2) { opacity: 0; }
.c-burger[aria-expanded='true'] span:nth-child(3) { transform: translateY(-9px) rotate(-45deg); }

/* 移动端全屏导航 */
.l-nav {
  position: fixed;
  inset: 0;
  z-index: var(--z-nav);
  background: var(--ink);
  color: #fff;
  padding: 96px 24px 40px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transform: translateY(-100%);
  visibility: hidden;
  transition: transform .55s var(--ease-out), visibility .55s;
  overflow-y: auto;
}
.l-nav.is-open { transform: translateY(0); visibility: visible; }
.l-nav__menu { display: flex; flex-direction: column; gap: 4px; }
.l-nav__menu a {
  display: block;
  font-size: 1.75rem;
  font-weight: 600;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-inv);
  letter-spacing: -.02em;
}
.l-nav__menu .is-current a { color: var(--accent); }
/* 移动端二级菜单 */
.l-nav__sub-menu { margin: 2px 0 10px; }
.l-nav__sub-menu a {
  padding: 7px 0 7px 16px;
  margin-left: 3px;
  border-bottom: 0;
  border-left: 1px solid var(--line-inv);
  font-size: 1rem;
  font-weight: 500;
  color: rgba(255, 255, 255, .58);
  letter-spacing: 0;
}
.l-nav__sub-menu a:hover { color: #fff; }
.l-nav__bottom { margin-top: 40px; display: grid; gap: 20px; }
.l-nav__bottom a { color: rgba(255, 255, 255, .66); font-size: .9375rem; }
.l-nav__bottom .btn { width: 100%; }

/* ---------- 7. 首屏 ---------- */
.block-hero {
  position: relative;
  background: var(--ink);
  color: #fff;
  padding: 150px 0 76px;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.block-hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.block-hero__bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(74, 133, 204, .09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74, 133, 204, .09) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(ellipse 105% 85% at 62% 42%, #000 20%, transparent 76%);
  -webkit-mask-image: radial-gradient(ellipse 105% 85% at 62% 42%, #000 20%, transparent 76%);
}
.block-hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(58% 52% at 76% 30%, rgba(30, 91, 168, .55), transparent 68%),
    radial-gradient(40% 40% at 12% 82%, rgba(53, 194, 240, .16), transparent 70%);
}
.block-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.02fr .98fr;
  gap: 56px;
  align-items: center;
  width: 100%;
}
.block-hero__title { margin: 22px 0 0; }
.block-hero__title em {
  font-style: normal;
  color: var(--accent);
  position: relative;
}
.block-hero__lead {
  margin-top: 26px;
  max-width: 30em;
  font-size: clamp(1rem, 1.15vw, 1.15rem);
  line-height: 1.88;
  color: rgba(255, 255, 255, .76);
}
.block-hero .btn-row { margin-top: 38px; }
.block-hero__art { position: relative; }
.block-hero__art img {
  width: 100%;
  filter: drop-shadow(0 40px 80px rgba(0, 0, 0, .45));
}

/* 首屏指标条 */
.block-hero__meta {
  position: relative;
  margin-top: 66px;
  padding-top: 30px;
  border-top: 1px solid var(--line-inv);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.c-metric__num {
  font-size: clamp(1.5rem, 2.4vw, 2.125rem);
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.1;
}
.c-metric__num span { font-size: .6em; font-weight: 600; margin-left: 2px; color: var(--accent); }
.c-metric__label {
  margin-top: 8px;
  font-size: .8125rem;
  color: rgba(255, 255, 255, .58);
  letter-spacing: .02em;
}

/* 内页头图 */
.block-page-hero {
  position: relative;
  background: var(--ink);
  color: #fff;
  padding: 168px 0 84px;
  overflow: hidden;
}
.block-page-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(52% 66% at 88% 12%, rgba(30, 91, 168, .5), transparent 70%),
    radial-gradient(36% 50% at 6% 90%, rgba(53, 194, 240, .14), transparent 72%);
  pointer-events: none;
}
.block-page-hero .container { position: relative; }
.block-page-hero__inner { max-width: 900px; }
.block-page-hero__title { margin: 20px 0 0; }
.block-page-hero__lead {
  margin-top: 24px;
  max-width: 42em;
  color: rgba(255, 255, 255, .74);
  font-size: clamp(1rem, 1.1vw, 1.125rem);
  line-height: 1.88;
}
.c-crumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .8125rem;
  color: rgba(255, 255, 255, .5);
}
.c-crumb a:hover { color: #fff; }
.c-crumb span { opacity: .5; }

/* ---------- 8. 材料跑马灯 ---------- */
.block-marquee {
  background: var(--paper-2);
  border-top: 1px solid var(--line-2);
  border-bottom: 1px solid var(--line-2);
  padding: 26px 0;
  overflow: hidden;
}
.block-marquee__label {
  text-align: center;
  font-size: .75rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted-2);
  margin-bottom: 18px;
}
.c-marquee { display: flex; overflow: hidden; mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.c-marquee__track {
  display: flex;
  gap: 56px;
  padding-right: 56px;
  flex: none;
  animation: marquee 38s linear infinite;
}
.c-marquee:hover .c-marquee__track { animation-play-state: paused; }
@keyframes marquee { to { transform: translateX(-100%); } }
.c-marquee__item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: .9375rem;
  font-weight: 500;
  color: var(--muted);
  white-space: nowrap;
}
.c-marquee__item::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand-l);
  flex: none;
}

/* ---------- 9. 工艺能力（发丝线栅格卡） ---------- */
.c-cards {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.c-cards--4 { grid-template-columns: repeat(4, 1fr); }
.c-cards--3 { grid-template-columns: repeat(3, 1fr); }
.c-cards--2 { grid-template-columns: repeat(2, 1fr); }

.c-card {
  position: relative;
  background: var(--paper);
  padding: 38px 30px 34px;
  transition: background var(--dur) var(--ease);
}
.c-card::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .5s var(--ease-out);
}
.c-card:hover { background: var(--brand-tint); }
.c-card:hover::before { transform: scaleX(1); }
.c-card__icon {
  width: 46px;
  height: 46px;
  margin-bottom: 22px;
  color: var(--brand);
}
.c-card__icon svg { width: 100%; height: 100%; }
.c-card__title { margin-bottom: 12px; }
.c-card__text { font-size: .9375rem; line-height: 1.8; color: var(--muted); }
.c-card__meta {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--line-2);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.c-tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--brand-tint);
  color: var(--brand-d);
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .01em;
}
.section--ink .c-tag { background: rgba(53, 194, 240, .14); color: var(--accent); }

/* ---------- 10. 编号特性列表 ---------- */
.c-bullets { display: grid; grid-auto-rows: 1fr; border-top: 1px solid var(--line); }
.c-bullets__item {
  display: grid;
  grid-template-columns: 84px 1fr 1.15fr;
  gap: 32px;
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
  transition: background var(--dur) var(--ease), padding var(--dur) var(--ease);
}
.c-bullets__item:hover { background: var(--paper-2); }
.c-bullets__num {
  font-size: .9375rem;
  font-weight: 600;
  color: var(--brand);
  letter-spacing: .06em;
}
.c-bullets__title { font-size: 1.1875rem; font-weight: 600; letter-spacing: -.01em; }
.c-bullets__text { color: var(--muted); font-size: .9375rem; line-height: 1.82; }
.section--ink .c-bullets,
.section--ink .c-bullets__item { border-color: var(--line-inv); }
.section--ink .c-bullets__item:hover { background: rgba(255, 255, 255, .04); }
.section--ink .c-bullets__text { color: rgba(255, 255, 255, .66); }
.section--ink .c-bullets__num { color: var(--accent); }

/* ---------- 11. 流程时间轴 ---------- */
.c-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}
.c-step {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 32px 26px 34px 0;
  border-right: 1px solid var(--line-2);
}
.c-step:last-child { border-right: 0; }
.c-step::before {
  content: '';
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 0 5px rgba(30, 91, 168, .12);
}
.c-step__num {
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--brand-l);
}
.c-step__title { margin: 12px 0 10px; font-size: 1.0625rem; font-weight: 600; }
.c-step__text { font-size: .875rem; line-height: 1.78; color: var(--muted); }
.c-step__dur {
  margin-top: auto;   /* 底部对齐：同一行各步骤的时长标签始终在同一水平线 */
  display: inline-block;
  font-size: .75rem;
  letter-spacing: .04em;
  color: var(--brand);
  background: var(--brand-tint);
  padding: 3px 10px;
  border-radius: 999px;
}

/* ---------- 12. 案例卡 ---------- */
.c-case {
  display: flex;
  flex-direction: column;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.c-case:hover {
  transform: translateY(-4px);
  border-color: rgba(30, 91, 168, .35);
  box-shadow: 0 24px 48px -26px rgba(13, 42, 72, .38);
}
.c-case__media { position: relative; aspect-ratio: 16 / 10; overflow: hidden; background: var(--ink); }
.c-case__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .7s var(--ease-out);
}
.c-case:hover .c-case__media img { transform: scale(1.045); }
.c-case__badge {
  position: absolute;
  top: 16px;
  left: 16px;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(10, 26, 43, .78);
  backdrop-filter: blur(6px);
  color: #fff;
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .04em;
}
.c-case__body { padding: 26px 26px 28px; display: flex; flex-direction: column; flex: 1 1 auto; }
.c-case__title { font-size: 1.125rem; font-weight: 600; margin-bottom: 10px; }
.c-case__text { font-size: .9375rem; line-height: 1.8; color: var(--muted); }
.c-case__specs {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--line-2);
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: .8125rem;
  color: var(--muted);
}
.c-case__specs b { color: var(--text); font-weight: 600; }

/* ---------- 13. 数据条 ---------- */
.c-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line-inv);
}
.c-stats__item { background: var(--ink); padding: 40px 28px; }
.c-stats__num {
  font-size: clamp(2.25rem, 4vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -.03em;
  line-height: 1;
  color: #fff;
}
.c-stats__num span { font-size: .45em; color: var(--accent); margin-left: 4px; font-weight: 600; }
.c-stats__label { margin-top: 14px; font-size: .875rem; color: rgba(255, 255, 255, .6); }

/* ---------- 14. 参数表 ---------- */
.c-table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
.c-table { min-width: 720px; font-size: .9375rem; }
.c-table th,
.c-table td {
  padding: 18px 22px;
  text-align: left;
  border-bottom: 1px solid var(--line-2);
  vertical-align: top;
}
.c-table thead th {
  background: var(--paper-2);
  font-weight: 600;
  font-size: .8125rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}
.c-table tbody tr:last-child td { border-bottom: 0; }
.c-table tbody tr:hover { background: var(--brand-tint); }
.c-table td:first-child { font-weight: 600; color: var(--text); white-space: nowrap; }
.c-table td { color: var(--muted); }

/* ---------- 15. 双栏图文 ---------- */
.c-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 5vw, 84px);
  align-items: center;
}
.c-split--wide-left { grid-template-columns: 1.15fr .85fr; }
.c-split--wide-right { grid-template-columns: .85fr 1.15fr; }
/* 顶部对齐：一侧内容明显更长时使用，避免另一侧被垂直居中后留下大片空白 */
.c-split--top { align-items: start; }
.c-split--top > *:first-child { position: sticky; top: 108px; }
.c-split__media {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink);
}
.c-split__media img { width: 100%; }

/* 时间线（关于我们） */
.c-timeline { border-left: 1px solid var(--line); padding-left: 0; }
.c-timeline__item {
  position: relative;
  padding: 0 0 34px 34px;
}
.c-timeline__item::before {
  content: '';
  position: absolute;
  left: -4.5px;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--brand);
}
.c-timeline__year {
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--brand);
}
.c-timeline__title { margin: 6px 0 6px; font-size: 1.0625rem; font-weight: 600; }
.c-timeline__text { font-size: .9375rem; color: var(--muted); line-height: 1.78; }

/* ---------- 16. FAQ ---------- */
.c-faq { border-top: 1px solid var(--line); }
.c-faq__item { border-bottom: 1px solid var(--line); }
.c-faq__item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 0;
  cursor: pointer;
  font-size: 1.0625rem;
  font-weight: 600;
  list-style: none;
  transition: color .25s var(--ease);
}
.c-faq__item summary::-webkit-details-marker { display: none; }
.c-faq__item summary:hover { color: var(--brand); }
.c-faq__item summary::after {
  content: '';
  flex: none;
  width: 12px;
  height: 12px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform .3s var(--ease);
  opacity: .6;
}
.c-faq__item[open] summary::after { transform: rotate(-135deg) translate(-3px, -3px); }
.c-faq__body { padding: 0 0 26px; max-width: 78ch; color: var(--muted); font-size: .9375rem; line-height: 1.85; }

/* ---------- 17. 表单 ---------- */
.c-form { display: grid; gap: 22px; }
.c-form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.c-field { display: grid; gap: 9px; }
.c-field label { font-size: .8125rem; font-weight: 600; letter-spacing: .03em; color: var(--text); }
.c-field label .req { color: #D64545; margin-left: 3px; }
.c-field input,
.c-field select,
.c-field textarea {
  font: inherit;
  font-size: .9375rem;
  color: var(--text);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  width: 100%;
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease);
}
.c-field textarea { min-height: 132px; resize: vertical; line-height: 1.7; }
.c-field input:focus,
.c-field select:focus,
.c-field textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(30, 91, 168, .12);
}
.c-field input::placeholder,
.c-field textarea::placeholder { color: var(--muted-2); }
.c-field .err { font-size: .8125rem; color: #D64545; min-height: 1.2em; }
.c-field.has-error input,
.c-field.has-error textarea,
.c-field.has-error select { border-color: #D64545; }
.c-check { display: flex; gap: 11px; align-items: flex-start; font-size: .875rem; color: var(--muted); }
.c-check input { width: 17px; height: 17px; margin-top: 4px; flex: none; accent-color: var(--brand); }
.c-form__note { font-size: .8125rem; color: var(--muted-2); }
.c-form__status {
  display: none;
  padding: 16px 20px;
  border-radius: var(--radius);
  background: var(--brand-tint);
  border: 1px solid rgba(30, 91, 168, .28);
  color: var(--brand-d);
  font-size: .9375rem;
}
.c-form__status.is-shown { display: block; }

/* 联系信息块 */
.c-info { display: grid; gap: 30px; }
.c-info__item { display: grid; grid-template-columns: 42px 1fr; gap: 16px; }
.c-info__icon {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--brand-tint);
  color: var(--brand);
}
.c-info__icon svg { width: 19px; height: 19px; }
.c-info__label { font-size: .75rem; letter-spacing: .14em; text-transform: uppercase; color: var(--muted-2); }
.c-info__value { font-size: 1.0625rem; font-weight: 600; margin-top: 4px; }
.c-info__value a:hover { color: var(--brand); }
.c-info__sub { font-size: .875rem; color: var(--muted); margin-top: 2px; }

.c-map {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--paper-2);
  position: relative;
  aspect-ratio: 21 / 9;
}
.c-map img { width: 100%; height: 100%; object-fit: cover; }
.c-map__pin {
  position: absolute;
  left: 22px;
  bottom: 22px;
  max-width: 420px;
  padding: 16px 22px;
  background: rgba(255, 255, 255, .95);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 14px 34px -20px rgba(13, 42, 72, .45);
  color: var(--text);
  font-size: .875rem;
  display: grid;
  gap: 3px;
}
.c-map__pin strong { font-size: .9375rem; font-weight: 600; }

/* ---------- 18. CTA 带 ---------- */
.block-cta {
  position: relative;
  background: var(--ink);
  color: #fff;
  padding: clamp(64px, 7vw, 104px) 0;
  overflow: hidden;
}
.block-cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 120% at 82% 50%, rgba(30, 91, 168, .55), transparent 66%),
    radial-gradient(38% 90% at 4% 0%, rgba(53, 194, 240, .13), transparent 70%);
}
.block-cta__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.25fr auto;
  gap: 48px;
  align-items: center;
}
.block-cta__title { margin: 16px 0 0; max-width: 20em; }
.block-cta__text { margin-top: 18px; max-width: 34em; color: rgba(255, 255, 255, .72); }

/* ---------- 19. 页脚 ---------- */
.l-footer {
  background: var(--ink);
  color: rgba(255, 255, 255, .66);
  padding: clamp(56px, 6vw, 88px) 0 0;
  font-size: .9375rem;
  border-top: 1px solid var(--line-inv);
}
.l-footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.25fr;
  gap: 44px;
  padding-bottom: 56px;
}
.l-footer__brand { display: flex; align-items: center; gap: 12px; color: #fff; font-weight: 700; font-size: 1.0625rem; }
.l-footer__brand img { width: 36px; height: 36px; }
.l-footer__brand small {
  display: block;
  font-size: .5rem;
  font-weight: 500;
  letter-spacing: .15em;
  color: rgba(255, 255, 255, .5);
  text-transform: uppercase;
  margin-top: 4px;
  white-space: nowrap;
}
.l-footer__desc { margin-top: 20px; max-width: 30em; line-height: 1.85; font-size: .875rem; }
.l-footer__title {
  color: #fff;
  font-size: .8125rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.l-footer__list { display: grid; gap: 12px; font-size: .9375rem; }
.l-footer__list a:hover { color: #fff; }
.l-footer__contact { display: grid; gap: 16px; font-size: .875rem; }
.l-footer__contact b { color: #fff; font-weight: 600; display: block; font-size: .9375rem; }
.l-footer__bottom {
  border-top: 1px solid var(--line-inv);
  padding: 24px 0 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px 28px;
  justify-content: space-between;
  align-items: center;
  font-size: .8125rem;
  color: rgba(255, 255, 255, .48);
}
.l-footer__bottom a:hover { color: #fff; }
.l-footer__legal { display: flex; flex-wrap: wrap; gap: 18px; }

/* ---------- 20. 返回顶部 / 进度条 ---------- */
.c-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: var(--accent);
  z-index: 200;
  width: 0;
  transition: width .1s linear;
}
.c-totop {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  display: grid;
  place-items: center;
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .35s var(--ease), transform .35s var(--ease), visibility .35s;
  box-shadow: 0 10px 26px -10px rgba(10, 26, 43, .6);
}
.c-totop.is-shown { opacity: 1; visibility: visible; transform: translateY(0); }
.c-totop:hover { background: var(--brand); }

/* ---------- 20a. 页面级组件 ---------- */
/* 参数定义表 */
.c-deflist { border-top: 1px solid var(--line); }
.c-deflist > div {
  display: grid;
  grid-template-columns: 132px 1fr;
  gap: 18px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-2);
}
.c-deflist dt {
  font-size: .8125rem;
  letter-spacing: .05em;
  color: var(--muted-2);
}
.c-deflist dd { margin: 0; font-size: .9375rem; font-weight: 500; color: var(--text); }
.section--ink .c-deflist,
.section--ink .c-deflist > div { border-color: var(--line-inv); }
.section--ink .c-deflist dd { color: #fff; }
.section--ink .c-deflist dt { color: rgba(255, 255, 255, .5); }

/* 锚点胶囊导航 */
.c-anchornav { display: flex; flex-wrap: wrap; gap: 10px; }
.c-anchornav a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: .875rem;
  font-weight: 500;
  color: var(--muted);
  background: var(--paper);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease),
              background var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.c-anchornav a:hover {
  border-color: var(--brand);
  color: var(--brand);
  background: var(--brand-tint);
  transform: translateY(-2px);
}

/* 人员 / 岗位占位卡 */
.c-person { display: grid; gap: 16px; }
.c-person__photo {
  aspect-ratio: 1 / 1;
  border-radius: var(--radius);
  background: linear-gradient(150deg, var(--ink-3), var(--ink));
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  color: var(--accent);
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: .1em;
}
.c-person__name { font-size: 1.0625rem; font-weight: 600; }
.c-person__role { font-size: .875rem; color: var(--muted); margin-top: 3px; }

/* 认证 / 资质徽标 */
.c-badges { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.c-badge {
  background: var(--paper);
  padding: 26px 22px;
  text-align: center;
  transition: background var(--dur) var(--ease);
}
.c-badge:hover { background: var(--brand-tint); }
.c-badge__mark {
  width: 40px;
  height: 40px;
  margin: 0 auto 14px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--brand-tint);
  color: var(--brand);
}
.c-badge__mark svg { width: 18px; height: 18px; }
.c-badge__label { font-size: .875rem; font-weight: 600; }
.c-badge__sub { font-size: .75rem; color: var(--muted-2); margin-top: 4px; }

/* 引用块 */
.c-quote {
  border-left: 2px solid var(--brand);
  padding: 4px 0 4px 26px;
  font-size: clamp(1.0625rem, 1.5vw, 1.375rem);
  line-height: 1.75;
  color: var(--text);
  letter-spacing: -.01em;
}
.c-quote__by { margin-top: 18px; font-size: .875rem; color: var(--muted); letter-spacing: 0; }

/* 长文排版（隐私政策等） */
.c-prose { max-width: 80ch; }
.c-prose h2 { font-size: 1.25rem; margin: 44px 0 14px; }
.c-prose h3 { font-size: 1.0625rem; margin: 28px 0 10px; }
.c-prose p,
.c-prose li { color: var(--muted); font-size: .9375rem; line-height: 1.95; }
.c-prose ul { list-style: disc; padding-left: 22px; display: grid; gap: 8px; margin: 0 0 1.1em; }
.c-prose > *:first-child { margin-top: 0; }
.c-prose strong { color: var(--text); }

/* ---------- 20c. 自研设备 ---------- */
.c-devices { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.c-device {
  display: grid;
  gap: 16px;
  align-content: start;
  padding: 34px 32px 30px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}
.c-device:hover {
  transform: translateY(-3px);
  border-color: rgba(30, 91, 168, .35);
  box-shadow: 0 22px 44px -28px rgba(13, 42, 72, .36);
}
.c-device__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.c-device__name { font-size: 1.25rem; font-weight: 700; letter-spacing: -.012em; }
.c-device__series {
  padding: 4px 11px;
  border-radius: 999px;
  background: var(--brand-tint);
  color: var(--brand-d);
  font-size: .6875rem;
  font-weight: 600;
  letter-spacing: .06em;
  white-space: nowrap;
}
.c-device__media {
  aspect-ratio: 16 / 10;
  background: var(--paper-2);
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  overflow: hidden;
  display: grid;
  place-items: center;
}
.c-device__media img { width: 100%; height: 100%; object-fit: contain; }
.c-device__desc { font-size: .9375rem; line-height: 1.8; color: var(--muted); }
.c-device__hl {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  padding-top: 18px;
  border-top: 1px solid var(--line-2);
}
.c-device__hl div { font-size: .75rem; letter-spacing: .05em; color: var(--muted-2); }
.c-device__hl b {
  display: block;
  margin-bottom: 2px;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--text);
}
.c-device__hl b em { font-style: normal; font-size: .6em; font-weight: 600; margin-left: 2px; color: var(--brand); }


/* ---------- 20d. 合作伙伴 LOGO 墙 ---------- */
/* 灰度显示、悬停恢复彩色：不同品牌的标志放一起时视觉更整齐 */
.c-partners {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.c-partner {
  background: #fff;
  display: grid;
  place-items: center;
  padding: 26px 22px;
  min-height: 116px;
  transition: background var(--dur) var(--ease);
}
.c-partner img {
  max-width: 100%;
  max-height: 54px;
  width: auto;
  height: auto;
  object-fit: contain;
  filter: grayscale(1);
  opacity: .72;
  transition: filter var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.c-partner:hover { background: var(--paper-2); }
.c-partner:hover img { filter: none; opacity: 1; }
/* ---------- 20b. 工具类 ---------- */
.u-mt-32 { margin-top: 32px; }
.u-mt-40 { margin-top: 40px; }
.u-mt-44 { margin-top: 44px; }
.u-mt-52 { margin-top: 52px; }
.u-mt-56 { margin-top: 56px; }
.u-flush { padding-top: 0; padding-bottom: 0; }

/* 独立指标条（首屏下方 / 内页） */
.c-metrics-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px 24px;
}
.c-metrics-row .c-metric__num { color: #fff; }
.c-metrics-row .c-metric__label { color: rgba(255, 255, 255, .58); }

/* ---------- 21. 滚动入场 ---------- */
/* 仅在 JS 可用时启用入场动效：禁用 JS 或爬虫抓取时内容必须可见 */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .8s var(--ease-out), transform .8s var(--ease-out);
  transition-delay: var(--delay, 0ms);
  will-change: opacity, transform;
}
.has-js [data-reveal].is-visible { opacity: 1; transform: none; }


/* ---------- 21b. 深色区块动效背景 ----------
   母题沿用「切片层叠」：缓慢漂移的细网格 + 呼吸式光晕。
   透明度压得很低，只做氛围，不影响文字可读性。
   自动受 .motion-paused（暂停动效按钮）与 prefers-reduced-motion 控制。 */
@keyframes bgDrift {
  from { background-position: 0 0; }
  to   { background-position: -128px -128px; }
}
@keyframes bgBreathe {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); opacity: .45; }
  50%      { transform: translate3d(2.5%, -2%, 0) scale(1.08); opacity: .75; }
}

.l-footer,
.section--ink,
.block-cta { position: relative; overflow: hidden; }

.l-footer > .container,
.section--ink > .container,
.block-cta > .container { position: relative; z-index: 1; }

/* 网格层 */
.l-footer::before,
.section--ink::before,
.block-cta::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(74, 133, 204, .085) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74, 133, 204, .085) 1px, transparent 1px);
  background-size: 128px 128px;
  animation: bgDrift 64s linear infinite;
  pointer-events: none;
  z-index: 0;
}

/* 光晕层 */
.l-footer::after,
.section--ink::after {
  content: '';
  position: absolute;
  inset: -35%;
  background: radial-gradient(42% 52% at 74% 32%, rgba(30, 91, 168, .34), transparent 70%);
  animation: bgBreathe 24s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

/* 页脚内容略提权，确保在装饰层之上 */
.l-footer > .container { z-index: 2; }

@media (prefers-reduced-motion: reduce) {
  .l-footer::before, .l-footer::after,
  .section--ink::before, .section--ink::after,
  .block-cta::after { animation: none; }
}
/* ---------- 22. 响应式 ---------- */
@media (min-width: 46.25em) {           /* 740px */
  :root { --pad: 40px; --header-pad: 24px; }
  .c-form__row { gap: 24px; }
}
@media (min-width: 67.5em) {            /* 1080px */
  :root { --pad: 60px; --header-pad: 30px; }
}

@media (max-width: 81.24em) {           /* < 1300px */
  .c-cards--4 { grid-template-columns: repeat(2, 1fr); }
  .c-steps { grid-template-columns: repeat(3, 1fr); }
  .c-step { border-bottom: 1px solid var(--line-2); }
  .l-footer__grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .l-footer__grid > :last-child { grid-column: 1 / -1; }
}

@media (max-width: 67.49em) {           /* < 1080px */
  .c-metrics-row { grid-template-columns: repeat(2, 1fr); }
  .c-badges { grid-template-columns: repeat(2, 1fr); }
  .c-partners { grid-template-columns: repeat(3, 1fr); }
  .l-header__nav { display: none; }
  .c-burger { display: flex; }
  .block-hero { padding-top: 128px; }
  .block-hero__inner { grid-template-columns: 1fr; gap: 44px; }
  .block-hero__art { max-width: 480px; margin: 0 auto; order: -1; }
  .block-hero__art img { max-height: 42vh; margin: 0 auto; }
  .block-hero__meta { grid-template-columns: repeat(2, 1fr); gap: 30px 24px; }
  .block-page-hero { padding: 140px 0 68px; }
  .section-head--split { grid-template-columns: 1fr; gap: 26px; align-items: start; }
  .c-split,
  .c-split--wide-left,
  .c-split--wide-right { grid-template-columns: 1fr; gap: 36px; }
  .c-split--top > *:first-child { position: static; }
  .c-split__media { order: -1; }
  .c-bullets__item { grid-template-columns: 60px 1fr; gap: 14px 20px; }
  .c-bullets__text { grid-column: 2 / -1; }
  .c-cards--3 { grid-template-columns: repeat(2, 1fr); }
  .c-stats { grid-template-columns: repeat(2, 1fr); }
  .block-cta__inner { grid-template-columns: 1fr; gap: 32px; }
  .c-steps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 46.24em) {           /* < 740px */
  body { font-size: 15.5px; }
  .l-header__inner { height: 72px; }
  .l-header__logo small { display: none; }
  .section { padding: 62px 0; }
  .c-cards--4,
  .c-cards--3,
  .c-cards--2 { grid-template-columns: 1fr; }
  .c-steps { grid-template-columns: 1fr; }
  .c-step { border-right: 0; padding-right: 0; }
  .c-stats { grid-template-columns: 1fr; }
  .c-form__row { grid-template-columns: 1fr; }
  .l-footer__grid { grid-template-columns: 1fr; gap: 34px; }
  .block-hero { min-height: auto; padding: 108px 0 62px; }
  .block-hero__meta { margin-top: 44px; }
  .btn { height: 46px; padding: 0 20px; font-size: .875rem; }
  .btn--lg { height: 52px; padding: 0 26px; }
  .btn-row .btn { flex: 1 1 auto; }
  .c-bullets__item { grid-template-columns: 1fr; gap: 10px; }
  .c-bullets__text { grid-column: 1; }
  .c-bullets__num { font-size: .8125rem; }
  .c-map { aspect-ratio: 4 / 3; }
  .c-metrics-row { grid-template-columns: 1fr; gap: 22px; }
  .c-deflist > div { grid-template-columns: 1fr; gap: 3px; }
  .c-devices { grid-template-columns: 1fr; }
  .c-badges { grid-template-columns: 1fr; }
  .c-partners { grid-template-columns: repeat(2, 1fr); }
  .c-partner { min-height: 94px; padding: 16px 12px; }
  .c-partner img { max-height: 38px; }
  .c-quote { padding-left: 18px; }
}

/* ---------- 23. 动效偏好 / 打印 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .has-js [data-reveal] { opacity: 1; transform: none; }
}

@media print {
  .l-header, .l-nav, .c-totop, .c-progress, .block-cta, .c-burger { display: none !important; }
  body { color: #000; }
  .section { padding: 24px 0; }
}