/* 械数集团 · 1.2.0.0
 * 版式骨架参考企业站通用结构：固定顶栏 / 全屏首屏 / 陈述带 / 三栏卡片 /
 * 左右分栏 / 四步流程 / 下载区 / 多列页脚。全部为原创样式与文案。
 */

:root {
  --bg: #ffffff;
  --surface: #f5f7fa;
  --ink: #111111;
  --ink-2: #5f636b;
  --ink-3: #8a8f98;
  --line: #e5e6eb;
  --line-2: #d4d8e0;
  --brand: #295fe6;
  --brand-dark: #1b47bd;
  --header: 80px;
  --gutter: 40px;
  --max: 1280px;
  --radius: 8px;
  --ease: cubic-bezier(.22, 1, .36, 1);
  --font: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Hiragino Sans GB",
    "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header) + 24px);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
}

img { max-width: 100%; height: auto; }
svg { display: block; }
a { color: inherit; }
p { margin: 0; }

.container {
  width: min(100% - var(--gutter) * 2, var(--max));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 999;
  padding: 10px 16px;
  border-radius: 6px;
  background: var(--ink);
  color: #fff;
  font-size: 14px;
  text-decoration: none;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------------- 环境光：两层极淡光晕，仅位移与缩放 ---------------- */
.ambient {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}
.ambient i {
  position: absolute;
  display: block;
  width: 62vw;
  height: 62vw;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(41, 95, 230, .045), rgba(41, 95, 230, 0) 100%);
  will-change: transform;
  animation: drift-a 54s ease-in-out infinite alternate;
}
.ambient i:first-child { top: -22vw; left: -14vw; }
.ambient i:last-child {
  right: -16vw;
  bottom: -22vw;
  width: 52vw;
  height: 52vw;
  background: radial-gradient(closest-side, rgba(120, 160, 255, .055), rgba(120, 160, 255, 0) 100%);
  animation: drift-b 72s ease-in-out infinite alternate;
  animation-delay: -18s;
}
@keyframes drift-a {
  from { transform: translate3d(-2%, -1%, 0) scale(1); }
  to { transform: translate3d(6%, 5%, 0) scale(1.06); }
}
@keyframes drift-b {
  from { transform: translate3d(3%, 2%, 0) scale(1.04); }
  to { transform: translate3d(-5%, -4%, 0) scale(.97); }
}

main,
.site-footer { position: relative; z-index: 1; }

/* ---------------- 指针柔光：静态光斑，只改 transform/opacity ---------------- */
.spot {
  position: relative;
  isolation: isolate;
  overflow: hidden;
}
.spot::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 0;
  width: 340px;
  height: 340px;
  margin: -170px 0 0 -170px;
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(closest-side, rgba(41, 95, 230, .10), rgba(41, 95, 230, 0) 100%);
  opacity: 0;
  transform: translate3d(-50%, -50%, 0) translate3d(var(--dx, 0px), var(--dy, 0px), 0);
  transition: opacity .3s var(--ease);
}
.spot:hover::after { opacity: 1; }
.spot > * { position: relative; z-index: 1; }
.btn-primary.spot::after,
.btn-dark.spot::after {
  background: radial-gradient(closest-side, rgba(255, 255, 255, .26), rgba(255, 255, 255, 0) 100%);
}

/* ---------------- 入场：一次性渐显，位移 10px ---------------- */
.js .reveal {
  opacity: 0;
  transform: translate3d(0, 10px, 0);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}
.js .reveal.is-in { opacity: 1; transform: translate3d(0, 0, 0); }
.grid-3 .reveal:nth-child(2) { transition-delay: .05s; }
.grid-3 .reveal:nth-child(3) { transition-delay: .1s; }

.eyebrow {
  display: inline-block;
  margin-bottom: 18px;
  color: var(--ink-3);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .16em;
  line-height: 1.4;
  text-transform: uppercase;
}

/* ---------------- 顶栏 ---------------- */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 60;
  height: var(--header);
  background: rgba(255, 255, 255, .94);
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
}
.site-header.is-stuck {
  border-bottom-color: var(--line);
  box-shadow: 0 1px 0 rgba(17, 17, 17, .02);
}

.header-inner {
  display: flex;
  align-items: center;
  height: 100%;
  gap: clamp(16px, 2.4vw, 40px);
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: none;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
}
.brand-mark { display: block; width: 26px; height: 30px; }
.brand-mark svg { width: 100%; height: 100%; }
.brand-text {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.05;
}
.brand-sub {
  display: block;
  margin-top: 4px;
  color: var(--ink-3);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: .2em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.2vw, 34px);
  margin-left: clamp(4px, 2vw, 36px);
  white-space: nowrap;
}
.site-nav a {
  position: relative;
  padding: 2px 0;
  color: var(--ink);
  font-size: 16px;
  line-height: 32px;
  text-decoration: none;
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .18s var(--ease);
}
.site-nav a:hover::after,
.site-nav a:focus-visible::after,
.site-nav a.is-active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}

.btn-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 20px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color .18s var(--ease), color .18s var(--ease);
}
.btn-pill:hover,
.btn-pill:focus-visible { background: var(--ink); color: #fff; }

.menu-btn {
  display: none;
  position: relative;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}
.menu-btn span {
  position: absolute;
  left: 10px;
  width: 20px;
  height: 1.5px;
  background: currentColor;
  transition: transform .22s var(--ease), opacity .16s var(--ease);
}
.menu-btn span:nth-child(1) { top: 14px; }
.menu-btn span:nth-child(2) { top: 19.5px; }
.menu-btn span:nth-child(3) { top: 25px; }
.menu-btn[aria-expanded="true"] span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.menu-btn[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-btn[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

.mobile-nav {
  position: fixed;
  top: var(--header);
  left: 0;
  right: 0;
  z-index: 55;
  padding: 8px var(--gutter) 28px;
  background: #fff;
  border-bottom: 1px solid var(--line);
  opacity: 0;
  transform: translateY(-8px);
  visibility: hidden;
  transition: opacity .2s var(--ease), transform .2s var(--ease), visibility 0s linear .2s;
}
.mobile-nav.is-open {
  opacity: 1;
  transform: translateY(0);
  visibility: visible;
  transition-delay: 0s;
}
.mobile-nav a {
  display: block;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  font-size: 18px;
  font-weight: 500;
  text-decoration: none;
}
.mobile-nav a:last-child { border-bottom: 0; }

/* ---------------- 首屏 ---------------- */
.hero {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 100svh;
  padding: calc(var(--header) + 48px) 0 40px;
  background: var(--bg);
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 48px;
}
.hero-copy { max-width: 940px; }

.hero-mark {
  display: block;
  width: 62px;
  height: 70px;
  margin-bottom: 32px;
  color: var(--ink);
  animation: rise .6s var(--ease) both;
}
.hero-mark svg { width: 100%; height: 100%; }

.hero h1 {
  margin: 0 0 30px;
  font-size: clamp(44px, 5.9vw, 86px);
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.12;
}
.hero h1 em {
  font-style: normal;
  color: var(--brand);
}

.hero-lead {
  max-width: 760px;
  margin-bottom: 36px;
  color: var(--ink-2);
  font-size: 18px;
  line-height: 1.85;
}
.nb { white-space: nowrap; }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  height: 52px;
  padding: 0 28px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 500;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color .18s var(--ease), color .18s var(--ease),
    border-color .18s var(--ease), transform .18s var(--ease);
}
.btn .arrow { width: 16px; height: 16px; transition: transform .2s var(--ease); }
.btn:hover .arrow { transform: translateX(3px); }

.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover,
.btn-primary:focus-visible { background: var(--brand); }

.btn-ghost {
  border-color: var(--line-2);
  color: var(--ink);
  background: transparent;
}
.btn-ghost:hover,
.btn-ghost:focus-visible { border-color: var(--ink); background: var(--surface); }

.btn-dark {
  height: 44px;
  padding: 0 22px;
  background: var(--ink);
  color: #fff;
  font-size: 14px;
}
.btn-dark:hover,
.btn-dark:focus-visible { background: var(--brand); color: #fff; }

.hero-mobile {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 22px;
}
.hero-app {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid var(--line-2);
  padding-bottom: 3px;
  transition: border-color .18s var(--ease);
}
.hero-app:hover { border-color: var(--ink); }
.hero-app-tag {
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink-2);
  font-size: 11px;
  line-height: 1.7;
}

/* 微信内置浏览器：只多一行轻提示，不弹窗、不遮屏 */
.hero-wechat-tip {
  display: none;
  margin-top: 10px;
  max-width: 30rem;
  color: var(--ink-2);
  font-size: 13px;
  line-height: 1.7;
  overflow-wrap: anywhere;
}
html.is-wechat .hero-wechat-tip { display: block; }

.hero-side {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding-bottom: 6px;
}
.hero-arrow {
  display: grid;
  place-items: center;
  width: 92px;
  height: 92px;
  border: 2px solid var(--ink);
  border-radius: 50%;
  color: var(--ink);
  text-decoration: none;
  transition: background-color .2s var(--ease), color .2s var(--ease),
    border-color .2s var(--ease), transform .2s var(--ease);
}
.hero-arrow svg { width: 26px; height: 26px; }
.hero-arrow:hover,
.hero-arrow:focus-visible {
  background: var(--ink);
  color: #fff;
  transform: translateY(2px);
}
.hero-side-label {
  color: var(--ink-3);
  font-size: 11px;
  letter-spacing: .12em;
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: clamp(48px, 7vw, 80px);
  border-top: 1px solid var(--line);
}
.fact { padding: 20px 24px 0 0; }
.fact b {
  display: block;
  margin-bottom: 6px;
  color: var(--ink-3);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .14em;
}
.fact span { color: var(--ink-2); font-size: 15px; line-height: 1.7; }

.scroll-cue { display: none; }

@keyframes rise {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------------- 陈述带 ---------------- */
.intro {
  padding: 80px 0;
  background: var(--surface);
}
.intro p {
  max-width: 1180px;
  font-size: 20px;
  line-height: 1.75;
  text-align: left;
}
.intro strong { font-weight: 700; }

/* ---------------- 通用分区 ---------------- */
.section { padding: clamp(72px, 8.5vw, 124px) 0; }
.section--muted { background: var(--surface); }

.section-head {
  max-width: 820px;
  margin-bottom: clamp(36px, 5vw, 60px);
}
.section-head h2 {
  margin: 0 0 18px;
  font-size: clamp(28px, 3.3vw, 44px);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.26;
}
.section-head p {
  color: var(--ink-2);
  font-size: 17px;
  line-height: 1.85;
}

/* ---------------- 三栏卡片 ---------------- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}
.card {
  display: flex;
  flex-direction: column;
  min-height: 330px;
  padding: 34px 30px 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  transition: border-color .2s var(--ease), transform .2s var(--ease),
    box-shadow .24s var(--ease);
}
.card:hover {
  border-color: var(--ink);
  transform: translateY(-2px);
  box-shadow: 0 24px 48px -36px rgba(17, 17, 17, .35);
}
.card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 28px;
}
.card-icon { display: block; width: 42px; height: 42px; color: var(--brand); }
.card-icon svg { width: 100%; height: 100%; }
.card-index { color: var(--ink-3); font-size: 12px; letter-spacing: .12em; }
.card h3 {
  margin: 0 0 12px;
  font-size: 24px;
  font-weight: 700;
  line-height: 1.35;
}
.card p {
  margin-bottom: 26px;
  color: var(--ink-2);
  font-size: 15px;
  line-height: 1.85;
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}
.tag {
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-2);
  font-size: 12px;
  line-height: 26px;
  white-space: nowrap;
}

/* ---------------- 左右分栏 ---------------- */
.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
  align-items: center;
  gap: clamp(40px, 6vw, 80px);
}
.split-copy h2 {
  margin: 0 0 20px;
  font-size: clamp(26px, 3vw, 40px);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.26;
}
.split-lead {
  margin-bottom: 34px;
  color: var(--ink-2);
  font-size: 17px;
  line-height: 1.85;
}

.layer-list { margin: 0; padding: 0; list-style: none; }
.layer-list li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}
.layer-list li:last-child { border-bottom: 1px solid var(--line); }
.layer-num {
  color: var(--brand);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
  line-height: 1.9;
}
.layer-list b { display: block; font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.layer-list p { color: var(--ink-2); font-size: 14px; line-height: 1.8; }

.layer-visual {
  padding: clamp(22px, 3vw, 36px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}
.lv-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 58px;
  margin-bottom: 10px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}
.lv-row span:first-child { font-size: 15px; font-weight: 600; }
.lv-row span:last-child { color: var(--ink-3); font-size: 12px; letter-spacing: .04em; }
.lv-row--muted { background: var(--surface); }
.lv-row--strong { border-color: var(--brand); }
.lv-row--strong span:first-child { color: var(--brand); }
.lv-base {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  margin-top: 18px;
  border-radius: 6px;
  background: var(--ink);
  color: #fff;
  font-size: 12px;
  letter-spacing: .1em;
}

/* ---------------- 四步流程 ---------------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px;
}
.step {
  padding-top: 24px;
  border-top: 1px solid var(--ink);
}
.step-num {
  display: block;
  margin-bottom: 14px;
  color: var(--brand);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
}
.step h3 {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
}
.step p { color: var(--ink-2); font-size: 14px; line-height: 1.8; }

/* ---------------- 下载 ---------------- */
.dl-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  align-items: start;
  gap: 28px;
}
.dl-main,
.dl-verify {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}
.dl-main { padding: clamp(24px, 3vw, 36px); }

.dl-android {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 28px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--line);
}
.dl-kicker {
  display: block;
  margin-bottom: 8px;
  color: var(--ink-3);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.dl-android h3,
.dl-windows h3 {
  margin: 0 0 10px;
  font-size: 24px;
  font-weight: 700;
  line-height: 1.35;
}
.dl-text { color: var(--ink-2); font-size: 14px; line-height: 1.8; }
.dl-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 18px;
}
.dl-path {
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: 12px;
  overflow-wrap: anywhere;
}
.dl-qr {
  width: 132px;
  height: 132px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.dl-windows {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.dl-other { margin-top: 22px; }
.dl-other summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 0;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}
.dl-other summary::-webkit-details-marker { display: none; }
.dl-other summary::after {
  content: "+";
  color: var(--ink-3);
  font-size: 18px;
  font-weight: 400;
  line-height: 1;
}
.dl-other[open] summary::after { content: "−"; }
.other-list { padding-top: 10px; }
.other-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}
.other-item:last-child { border-bottom: 0; }
.other-item a { color: var(--brand); text-decoration: none; }
.other-item a:hover { text-decoration: underline; }
.other-item--none { color: var(--ink-3); }

.dl-verify { padding: clamp(24px, 3vw, 32px); }
.dl-verify h3 { margin: 0 0 10px; font-size: 20px; font-weight: 700; }
.spec {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px 18px;
  margin: 22px 0;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.spec dt { color: var(--ink-3); font-size: 12px; line-height: 1.8; }
.spec dd { margin: 0; color: var(--ink); font-size: 13px; line-height: 1.8; text-align: right; }
.spec dd.hash {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .01em;
  overflow-wrap: anywhere;
}
.code {
  margin: 0 0 10px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink-2);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre;
}
.dl-warn {
  margin-top: 14px;
  color: var(--ink-2);
  font-size: 12px;
  line-height: 1.8;
}

/* ---------------- 页脚 ---------------- */
.site-footer {
  padding: 80px 0 40px;
  border-top: 1px solid var(--line);
  background: var(--surface);
}
.footer-top {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 48px;
}
.footer-mark { display: block; width: 34px; height: 38px; color: var(--ink); }
.footer-mark svg { width: 100%; height: 100%; }
.footer-brand p {
  margin-top: 18px;
  color: var(--ink-2);
  font-size: 13px;
  line-height: 1.9;
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
}
.footer-col h4 {
  margin: 0 0 18px;
  color: var(--ink-3);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
}
.footer-col a,
.footer-col p {
  display: block;
  margin: 0 0 10px;
  color: var(--ink-2);
  font-size: 14px;
  line-height: 1.8;
  text-decoration: none;
  overflow-wrap: anywhere;
}
.footer-col a:hover { color: var(--ink); }
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--ink-3);
  font-size: 13px;
}
.footer-legal a { color: inherit; text-decoration: none; }
.footer-legal a:hover { color: var(--ink); }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1100px) {
  .site-nav { gap: 16px; }
  .site-nav a { font-size: 15px; }
  .hero h1 { font-size: clamp(42px, 6.4vw, 72px); }
}

@media (max-width: 1024px) {
  :root { --header: 64px; --gutter: 24px; }
  .site-nav { display: none; }
  .menu-btn { display: block; }
  .hero { min-height: auto; padding: calc(var(--header) + 56px) 0 64px; }
  .hero-inner { gap: 32px; }
  .hero-side { align-self: start; padding-top: 4px; }
  .hero-arrow { width: 64px; height: 64px; border-width: 1.5px; }
  .hero-arrow svg { width: 20px; height: 20px; }
  .hero-facts { margin-top: 56px; }
  .split { grid-template-columns: 1fr; gap: 40px; }
  .layer-visual { max-width: 640px; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 24px; }
  .dl-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: 40px; }
  .footer-brand p { margin-top: 12px; }
  .footer-legal { margin-top: 48px; }
}

@media (max-width: 860px) {
  .grid-3 { grid-template-columns: 1fr; gap: 16px; }
  .card { min-height: 0; }
}

@media (max-width: 768px) {
  :root { --gutter: 20px; }
  .header-actions .btn-pill { display: none; }
  .brand-text { font-size: 16px; }
  .brand-sub { font-size: 8px; }

  .hero { padding: calc(var(--header) + 40px) 0 56px; }
  .hero-inner { display: block; position: relative; }
  .hero-side { position: absolute; top: 0; right: 0; padding-top: 0; }
  .hero-mark { width: 46px; height: 52px; margin-bottom: 24px; }
  .hero h1 {
    margin-bottom: 22px;
    font-size: clamp(34px, 9.4vw, 46px);
    line-height: 1.18;
    letter-spacing: -.015em;
  }
  .hero-lead { margin-bottom: 28px; font-size: 16px; line-height: 1.8; }
  .hero-lead .lead-seg { display: block; }
  .br-desk { display: none; }
  .eyebrow-en { display: none; }
  .hero-actions { gap: 10px; }
  .btn { height: 46px; padding: 0 22px; font-size: 14px; }
  .hero-side { gap: 8px; }
  .hero-arrow { width: 48px; height: 48px; }
  .hero-arrow svg { width: 16px; height: 16px; }
  .hero-side-label { display: none; }

  .hero-facts {
    grid-template-columns: 1fr;
    margin-top: 40px;
    border-top: 0;
  }
  .fact {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 16px;
    padding: 13px 0;
    border-top: 1px solid var(--line);
  }
  .fact b { margin: 0; flex: none; font-size: 10px; }
  .fact span { font-size: 14px; text-align: right; }

  .intro { padding: 56px 0; }
  .intro p { font-size: 16px; line-height: 1.8; }

  .section { padding: 64px 0; }
  .section-head { margin-bottom: 32px; }
  .section-head h2 { font-size: 26px; }
  .section-head p { font-size: 15px; }
  .eyebrow { margin-bottom: 14px; font-size: 11px; }

  .card { padding: 26px 22px; }
  .card h3 { font-size: 21px; }
  .card p { font-size: 14px; }

  .split-copy h2 { font-size: 26px; }
  .split-lead { font-size: 15px; }
  .layer-list li { grid-template-columns: 36px minmax(0, 1fr); }
  .lv-row { min-height: 52px; padding: 0 14px; }
  .lv-row span:first-child { font-size: 14px; }
  .lv-row span:last-child { font-size: 11px; }

  .steps { grid-template-columns: 1fr; gap: 22px; }
  .step { padding-top: 20px; }
  .step h3 { font-size: 17px; }

  .dl-android { grid-template-columns: 1fr; gap: 20px; }
  .dl-qr { width: 112px; height: 112px; }
  .dl-android h3,
  .dl-windows h3 { font-size: 21px; }
  .dl-windows { padding: 24px 0; }
  .dl-windows .btn-dark { width: 100%; }
  .spec dd.hash { font-size: 10px; }

  .site-footer { padding: 56px 0 32px; }
  .footer-cols { grid-template-columns: 1fr 1fr; gap: 28px 24px; }
  .footer-legal { margin-top: 36px; padding-top: 20px; font-size: 12px; }
}

@media (max-width: 520px) {
  .hero-inner { grid-template-columns: minmax(0, 1fr) 48px; gap: 16px; }
  .hero h1 { font-size: 34px; }
  .hero-arrow { width: 42px; height: 42px; }
  .hero-arrow svg { width: 14px; height: 14px; }
  .btn { width: 100%; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .footer-cols { grid-template-columns: 1fr; }
  .spec { grid-template-columns: 1fr; gap: 4px 0; }
  .spec dt { margin-top: 10px; }
  .spec dd { text-align: left; }
  .dl-actions .btn { width: auto; }
}

@media (max-width: 400px) {
  .split-copy h2 { font-size: 23px; }
  .hero h1 { font-size: 32px; }
}

@media (max-width: 768px) {
  .ambient i { animation: none; }
  .ambient i:first-child {
    width: 92vw;
    height: 92vw;
    top: -30vw;
    left: -30vw;
  }
  .ambient i:last-child {
    width: 78vw;
    height: 78vw;
    right: -30vw;
    bottom: -24vw;
  }
}

/* 触摸设备：不做指针反光，改为轻触反馈 */
@media (hover: none) {
  .spot::after { display: none; }
  .card:active {
    transform: scale(.995);
    border-color: var(--line-2);
  }
  .btn:active,
  .btn-pill:active,
  .hero-arrow:active,
  .menu-btn:active { transform: scale(.98); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .ambient i { animation: none; }
  .js .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .spot::after { display: none; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}