/* ==========================================================================
   华天云海 · AIOPS 运维管理平台 官网
   设计基调：白色企业级版面 / 企业蓝 / 清晰层级 / 克制动效
   参考大型科技企业官网的信息密度与秩序，不使用霓虹、粒子与扫描线。
   ========================================================================== */

:root {
  --blue: #0b57d0;
  --blue-dark: #0842a0;
  --blue-mid: #2f7ae0;
  --blue-soft: #eaf2ff;
  --blue-line: #cfe0f8;

  --ink: #0f172a;
  --text: #334155;
  --muted: #64748b;
  --dim: #94a3b8;

  --bg: #ffffff;
  --bg-soft: #f6f8fb;
  --bg-soft-2: #f1f5fa;
  --dark: #07111d;

  --line: #e6ebf2;
  --line-soft: #eef2f7;

  --sans: "Microsoft YaHei", "Microsoft YaHei UI", "PingFang SC",
    "Hiragino Sans GB", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
  --latin: "Segoe UI", "Helvetica Neue", "Microsoft YaHei", Arial, sans-serif;

  --container: 1400px;
  --gutter: 40px;
  --header: 76px;

  --ease: cubic-bezier(0.22, 0.7, 0.22, 1);
  --slow: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

[hidden] {
  display: none !important;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

h1,
h2,
h3,
h4,
p,
figure {
  margin: 0;
}

h1,
h2,
h3,
h4 {
  color: var(--ink);
  font-weight: 600;
  letter-spacing: 0.01em;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

svg {
  display: block;
}

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

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: #f1f4f8;
}
::-webkit-scrollbar-thumb {
  background: #c8d3e2;
  border: 2px solid #f1f4f8;
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: #a7b7cc;
}

/* ---------- 通用 ---------- */

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

.skip {
  position: fixed;
  top: -80px;
  left: 24px;
  z-index: 10001;
  padding: 12px 20px;
  background: var(--blue);
  color: #fff;
  font-size: 13px;
  border-radius: 4px;
  transition: top 0.2s;
}
.skip:focus {
  top: 16px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--latin);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
}

.eyebrow .rule {
  width: 28px;
  height: 2px;
  background: var(--blue);
}

.gold-text {
  color: #8ec8ff;
}

.sec {
  position: relative;
  padding: 96px 0;
  border-top: 1px solid var(--line-soft);
}

.sec-head {
  max-width: 780px;
}

.sec-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.sec-no {
  font-family: var(--latin);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--blue);
}

.sec-kicker {
  font-family: var(--latin);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--dim);
}

.sec-kicker::before {
  content: "/";
  margin-right: 10px;
  color: #c8d3e2;
}

.sec-title {
  font-size: clamp(28px, 2.7vw, 40px);
  line-height: 1.32;
  letter-spacing: 0.005em;
}

.sec-lead {
  margin-top: 18px;
  max-width: 640px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--muted);
}

.sec-head .sec-lead {
  margin-top: 22px;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--slow);
  transition-delay: var(--d, 0s);
  will-change: opacity, transform;
}
.reveal.in {
  opacity: 1;
  transform: none;
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 46px;
  padding: 0 26px;
  border: 1px solid transparent;
  border-radius: 4px;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: background 0.2s, color 0.2s, border-color 0.2s, box-shadow 0.2s,
    transform 0.2s;
}

.btn .ar {
  font-size: 14px;
  line-height: 1;
}

.btn-gold {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 6px 16px rgba(11, 87, 208, 0.18);
}
.btn-gold:hover {
  background: var(--blue-dark);
  transform: translateY(-1px);
  box-shadow: 0 10px 22px rgba(11, 87, 208, 0.24);
}

.btn-line {
  background: #fff;
  border-color: #d6deea;
  color: #22314a;
}
.btn-line:hover {
  border-color: var(--blue);
  color: var(--blue);
  transform: translateY(-1px);
}

.btn-header {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 36px;
  padding: 0 18px;
  border-radius: 4px;
  background: var(--blue);
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  transition: background 0.2s;
}
.btn-header:hover {
  background: var(--blue-dark);
}
.btn-header .dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.75);
}

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14.5px;
  color: rgba(255, 255, 255, 0.82);
  transition: color 0.2s;
}
.link-more .line {
  position: relative;
  width: 26px;
  height: 1px;
  background: rgba(255, 255, 255, 0.42);
  transition: width 0.25s var(--ease), background 0.2s;
}
.link-more .line::after {
  content: "";
  position: absolute;
  right: -1px;
  top: -3px;
  width: 6px;
  height: 6px;
  border-top: 1px solid rgba(255, 255, 255, 0.7);
  border-right: 1px solid rgba(255, 255, 255, 0.7);
  transform: rotate(45deg);
}
.link-more:hover {
  color: #fff;
}
.link-more:hover .line {
  width: 34px;
  background: rgba(255, 255, 255, 0.8);
}

/* ---------- 顶栏 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s, box-shadow 0.25s;
}

.site-header.scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 4px 18px rgba(15, 35, 65, 0.05);
}

.header-inner {
  width: min(var(--container), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
  height: var(--header);
  display: flex;
  align-items: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: none;
}

.brand-logo {
  height: 32px;
  width: auto;
}

.nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 34px;
}

.nav a {
  position: relative;
  padding: 6px 0;
  font-size: 15px;
  color: #334155;
  transition: color 0.2s;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  background: var(--blue);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.25s var(--ease);
}

.nav a:hover,
.nav a.is-active {
  color: var(--blue);
}

.nav a.is-active::after,
.nav a:hover::after {
  transform: scaleX(1);
}

.header-actions {
  margin-left: 34px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  margin-right: -8px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}

.menu-toggle span {
  width: 20px;
  height: 1.5px;
  background: #1d2b3f;
  transition: transform 0.25s, opacity 0.2s;
}

body.menu-open .menu-toggle span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
body.menu-open .menu-toggle span:nth-child(2) {
  opacity: 0;
}
body.menu-open .menu-toggle span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: #fff;
  padding: 100px 28px 40px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: opacity 0.28s var(--ease), transform 0.28s var(--ease),
    visibility 0.28s;
}

body.menu-open .mobile-menu {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.mobile-menu nav {
  display: flex;
  flex-direction: column;
}

.mobile-menu nav a {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 19px;
  font-weight: 500;
  color: var(--ink);
}

.mobile-menu nav a span {
  font-family: var(--latin);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--blue);
}

.mobile-menu-foot {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--latin);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--dim);
}

/* ---------- 首页主视觉 ---------- */

.hero {
  position: relative;
  overflow: hidden;
  background: var(--dark);
  color: #fff;
  min-height: 620px;
  display: flex;
  align-items: center;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 64% 50%;
  transform: scale(1.03);
  animation: heroDrift 34s ease-in-out infinite alternate;
  will-change: transform;
}

.hero-shade {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(
      90deg,
      rgba(4, 10, 18, 0.94) 0%,
      rgba(4, 10, 18, 0.86) 30%,
      rgba(4, 10, 18, 0.46) 58%,
      rgba(4, 10, 18, 0.08) 84%
    ),
    linear-gradient(
      180deg,
      rgba(4, 10, 18, 0.4) 0%,
      transparent 30%,
      transparent 66%,
      rgba(4, 10, 18, 0.55) 100%
    );
}

@keyframes heroDrift {
  from {
    transform: scale(1.03) translateX(0);
  }
  to {
    transform: scale(1.07) translateX(-10px);
  }
}

.hero .container {
  position: relative;
  z-index: 2;
  padding: 96px 0 142px;
}

.hero-copy {
  max-width: 620px;
  animation: heroIn 0.9s var(--slow) both;
}

@keyframes heroIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.hero .eyebrow {
  color: rgba(255, 255, 255, 0.66);
  font-weight: 400;
}

.hero .eyebrow .rule {
  background: rgba(255, 255, 255, 0.5);
}

.hero h1 {
  margin-top: 24px;
  font-size: clamp(38px, 3.9vw, 64px);
  line-height: 1.24;
  letter-spacing: 0.005em;
  color: #fff;
}

.hero-sub {
  margin-top: 22px;
  max-width: 540px;
  font-size: 13px;
  line-height: 1.9;
  color: rgba(226, 236, 248, 0.5);
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-top: 36px;
}

.hero-note {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 28px;
  font-size: 13px;
  color: rgba(226, 236, 248, 0.5);
}

.hero-note span {
  font-size: 7px;
  color: #6ea8ff;
}

/* 主视觉下方的数据条 */
.hero-stats-wrap {
  position: relative;
  z-index: 3;
  margin-top: -64px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 28px 8px;
  box-shadow: 0 18px 48px rgba(16, 38, 72, 0.1);
}

.stat {
  padding: 2px 24px;
  border-left: 1px solid var(--line-soft);
}

.stat:first-child {
  border-left: 0;
}

.stat-num {
  font-family: var(--latin);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 2.6vw, 36px);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0.005em;
  color: var(--ink);
}

.stat-num small {
  font-family: var(--sans);
  margin-left: 5px;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* 分隔斜杠：两侧对称留白，不随单位前缀偏移 */
.stat-num small.stat-slash {
  margin: 0 5px;
}

.stat-label {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 区块标题排布 ---------- */

.product-head,
.cap-head,
.delivery-head {
  display: grid;
  grid-template-columns: 1.18fr 0.82fr;
  gap: 72px;
  align-items: end;
  margin-bottom: 44px;
}

.product-head .sec-lead,
.cap-head .sec-lead,
.delivery-head .sec-lead {
  margin-top: 0;
  padding-bottom: 6px;
}

/* ---------- 产品展示 ---------- */

.product {
  padding-top: 88px;
}

.showcase {
  margin-top: 0;
}

.tabs {
  display: flex;
  align-items: stretch;
  gap: 0;
  border-bottom: 1px solid var(--line);
  margin-bottom: 26px;
  overflow-x: auto;
  scrollbar-width: none;
}

.tabs::-webkit-scrollbar {
  display: none;
}

.tab {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 15px 26px;
  margin-bottom: -1px;
  border-bottom: 2px solid transparent;
  font-size: 15px;
  font-weight: 500;
  color: var(--muted);
  white-space: nowrap;
  transition: color 0.2s, border-color 0.2s;
}

.tab .no {
  font-family: var(--latin);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--dim);
}

/* 八项时均分整行，避免最后两项被藏进横向滚动 */
.tabs--eight .tab {
  flex: 1 1 0;
  justify-content: center;
  min-width: 132px;
  padding: 15px 10px;
  font-size: 14px;
  gap: 7px;
}

.tab:hover {
  color: var(--ink);
}

.tab.is-active {
  color: var(--blue);
  border-bottom-color: var(--blue);
}

.tab.is-active .no {
  color: var(--blue);
}

.stage {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 26px;
}

.frame {
  background: #fff;
  border: 1px solid #e2e9f3;
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 16px 40px rgba(17, 42, 82, 0.08);
}

.corner {
  display: none;
}

.panels {
  position: relative;
}

.panel {
  display: none;
  margin: 0;
}

.panel.is-active {
  display: block;
}

.panel img {
  display: block;
  width: 100%;
  height: auto;
}

.panel-cap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 20px;
  background: #fff;
  border-top: 1px solid var(--line-soft);
}

.cap-name {
  font-size: 13px;
  color: var(--ink);
}

.cap-note {
  font-family: var(--latin);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--dim);
}

/* 07 / 08：部署场景效果 */
.panel--scene .panel-cap {
  background: #071322;
  border-top-color: #12283f;
}

.panel--scene .cap-name {
  color: #dbe9f7;
}

.panel--scene .cap-note {
  color: #5d7b99;
}

.frame:has(.panel--scene.is-active) {
  background: #02060d;
  border-color: #0d1f33;
  box-shadow: 0 18px 46px rgba(3, 10, 20, 0.28);
}

.scene {
  position: relative;
  background: #02060d;
}

.scene-defs {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.scene-art {
  display: block;
  width: 100%;
  height: auto;
}

.scene-tag {
  position: absolute;
  left: 22px;
  top: 18px;
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--latin);
  font-size: 9.5px;
  letter-spacing: 0.2em;
  color: rgba(214, 235, 255, 0.62);
  pointer-events: none;
}

.scene-tag::before {
  content: "";
  width: 16px;
  height: 1px;
  background: var(--blue-mid);
}

/* 屏幕：截图嵌进数据中心场景 */
.scene .screen {
  position: relative;
  overflow: hidden;
  padding: 2px;
  background: #01050b;
  border: 1px solid rgba(111, 199, 242, 0.42);
  border-radius: 3px;
  box-shadow: 0 0 0 3px #02070f, 0 0 0 5px rgba(47, 122, 224, 0.38), 0 0 36px rgba(47, 122, 224, 0.34);
}

.scene .screen img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.scene .screen::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0) 40%);
  pointer-events: none;
}

/* 单屏：截图铺满背景里的大屏框（16:9，随截图比例） */
.scene .screen--single {
  position: absolute;
  left: 17.5%;
  top: 11.6667%;
  width: 65%;
  aspect-ratio: 16 / 9;
}

.wall5 {
  position: absolute;
  left: 1.875%;
  top: 15.5556%;
  width: 96.25%;
  height: 47.9556%;
  display: flex;
  align-items: center;
  gap: 1.5584%;
}

.w5-side {
  width: 23.526%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5.5607%;
}

.screen--side {
  width: 100%;
  aspect-ratio: 16 / 9;
  flex: none;
}

.screen--center {
  width: 49.8182%;
  aspect-ratio: 16 / 9;
  flex: none;
}

.screen-no {
  position: absolute;
  left: 3.5%;
  bottom: 3.5%;
  z-index: 2;
  padding: 2px 4px;
  font-family: var(--latin);
  font-size: clamp(7px, 0.58vw, 9px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.1em;
  color: rgba(190, 222, 247, 0.86);
  background: rgba(2, 8, 16, 0.68);
  border: 1px solid rgba(111, 199, 242, 0.24);
  border-radius: 2px;
}

.showcase-notes {
  margin-top: 30px;
}

.note-group {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.s-note {
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.s-note .k {
  font-family: var(--latin);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--blue);
}

.s-note .v {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 能力矩阵 ---------- */

.capabilities {
  background: var(--bg-soft);
}

.cap-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.cap-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 212px;
  padding: 28px 26px 26px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s var(--ease);
}

.cap-card:hover {
  border-color: var(--blue-line);
  box-shadow: 0 14px 34px rgba(19, 51, 100, 0.08);
  transform: translateY(-3px);
}

.cap-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 22px;
}

.cap-icon {
  width: 26px;
  height: 26px;
  color: var(--blue);
}

.cap-no {
  font-family: var(--latin);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: #b6c1d0;
}

.cap-card h3 {
  font-size: 17px;
  line-height: 1.5;
}

.cap-card p {
  margin-top: 9px;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
  text-wrap: balance;
}

/* 第 15 项（大数据分析）横跨两列，收尾整行 */
.cap-card--feature {
  grid-column: span 2;
  background: linear-gradient(180deg, #f7faff 0%, #fff 72%);
  border-color: #dbe7f8;
}

.cap-card--feature p {
  max-width: 660px;
}

/* ---------- 数字孪生 ---------- */

.twin-grid {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 72px;
  align-items: center;
}

.twin-copy .sec-lead {
  max-width: 500px;
}

.twin-points {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px 32px;
  margin-top: 38px;
}

.twin-point {
  display: flex;
  gap: 14px;
}

.twin-point .no {
  font-family: var(--latin);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--blue);
  padding-top: 4px;
}

.twin-point h4 {
  font-size: 15px;
  line-height: 1.5;
}

.twin-point p {
  margin-top: 5px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.twin-visual {
  position: relative;
}

.twin-frame {
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  background: #0b1626;
  box-shadow: 0 24px 60px rgba(16, 42, 82, 0.14);
}

.twin-frame img {
  width: 100%;
  height: auto;
}

.twin-chip {
  position: absolute;
  padding: 10px 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 6px;
  box-shadow: 0 12px 30px rgba(17, 43, 83, 0.12);
}

.twin-chip .k {
  font-family: var(--latin);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  color: var(--dim);
}

.twin-chip .v {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-top: 4px;
  font-family: var(--latin);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
}

.twin-chip--a {
  top: 22px;
  left: -26px;
}

.twin-chip--b {
  right: -20px;
  bottom: 34px;
}

.alert-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #e5484d;
  box-shadow: 0 0 0 3px rgba(229, 72, 77, 0.12);
}

/* ---------- 闭环 ---------- */

.flow-sec {
  background: var(--bg-soft);
}

.flow-head {
  max-width: 720px;
}

.flow {
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 26px;
  margin-top: 58px;
}

.flow-line {
  position: absolute;
  top: 23px;
  left: 23px;
  right: calc(20% - 43.8px);
  height: 2px;
  background: #e0e7f1;
  overflow: hidden;
}

.flow-line span {
  display: block;
  width: calc(var(--p, 0) * 100%);
  height: 100%;
  background: var(--blue);
  transition: width 0.1s linear;
}

.flow-step {
  position: relative;
}

.flow-node {
  position: relative;
  z-index: 1;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #fff;
  border: 1px solid #d8e2ef;
  font-family: var(--latin);
  font-size: 14px;
  font-weight: 600;
  color: var(--blue);
}

.flow-step h3 {
  margin-top: 20px;
  font-size: 16px;
}

.flow-step p {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 版本与交付 ---------- */

.tiers {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}

.tier {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 258px;
  padding: 24px 22px 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s var(--ease);
}

.tier:hover {
  border-color: var(--blue-line);
  box-shadow: 0 16px 36px rgba(19, 51, 100, 0.09);
  transform: translateY(-3px);
}

.tier .idx {
  font-family: var(--latin);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: #b6c1d0;
}

.tier .name {
  margin-top: 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.tier .scale {
  margin-top: 20px;
  font-family: var(--latin);
  font-variant-numeric: tabular-nums;
  font-size: 32px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--blue);
}

.tier .scale small {
  margin-left: 4px;
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 400;
  color: var(--muted);
}

.tier .use {
  flex: 1;
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
  text-wrap: balance;
}

.tier .go {
  margin-top: 16px;
  font-family: var(--latin);
  font-size: 14px;
  color: var(--blue);
  transition: transform 0.2s;
}

.tier:hover .go {
  transform: translateX(3px);
}

.delivery-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 4px;
  background: var(--blue-soft);
  color: #1e56a8;
  font-size: 12.5px;
}

.chip i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--blue-mid);
}

.arch {
  margin: 46px 0 0;
  padding: 34px 30px 18px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
}

.arch svg {
  width: 100%;
  height: auto;
}

.arch svg text {
  font-family: var(--sans);
  fill: var(--muted);
}

.dg-panel,
.dg-main,
.dg-outs rect,
.dg-rows rect,
.dg-chips rect {
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.dg-panel {
  fill: #f8fafc;
  stroke: #e1e8f2;
}

.dg-main {
  fill: #f1f6ff;
  stroke: #b9d2f4;
}

.dg-chips rect {
  fill: #fff;
  stroke: #dfe7f2;
}

.dg-chips text {
  fill: #334155;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-anchor: middle;
}

.arch .dg-kicker {
  font-family: var(--latin) !important;
  font-size: 10px;
  letter-spacing: 0.12em;
  fill: var(--blue) !important;
}

.arch .dg-tiny {
  font-family: var(--sans) !important;
  font-size: 10.5px;
  letter-spacing: 0.02em;
  fill: #8a97aa !important;
}

.arch .dg-title {
  font-family: var(--sans) !important;
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.04em;
  fill: var(--ink) !important;
}

.arch .dg-row-t,
.arch .dg-out-t {
  font-family: var(--sans) !important;
  font-weight: 500;
  fill: #1e2c44 !important;
}

.arch .dg-row-t {
  font-size: 14px;
  letter-spacing: 0.02em;
}

.arch .dg-row-s,
.arch .dg-out-s {
  font-size: 11px;
  letter-spacing: 0.01em;
  fill: #8a97aa !important;
}

.arch .dg-out-t {
  font-size: 15px;
  letter-spacing: 0.02em;
}

.dg-rows rect {
  fill: #fff;
  stroke: #e5ecf6;
}

.dg-outs rect {
  fill: #f8fbff;
  stroke: #dde8f7;
}

.dg-link {
  fill: none;
  stroke: #8db4e8;
  stroke-width: 1;
}

.dg-dash {
  fill: none;
  stroke: #c9d6e8;
  stroke-width: 1;
  stroke-dasharray: 3 4;
}

.arch figcaption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
  font-size: 12px;
  color: #7d8ca1;
}

.arch figcaption b {
  font-family: var(--latin);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: #a2afc0;
}

.arch-m {
  display: none;
}

/* ---------- 安全 ---------- */

.security {
  background: var(--bg-soft);
}

.sec-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 44px;
}

.sec-item {
  padding: 26px 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.sec-item .no {
  font-family: var(--latin);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--blue);
}

.sec-item h3 {
  margin-top: 14px;
  font-size: 17px;
}

.sec-item p {
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
}

.sec-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: 34px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: #7d8ca1;
}

.sec-foot .diamond {
  margin-right: 8px;
  font-size: 8px;
  color: var(--blue);
}

.sec-foot > span:last-child {
  font-family: var(--latin);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: #a2afc0;
}

/* ---------- 关于 ---------- */

.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 80px;
  align-items: start;
}

.about-logo {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 30px;
}

.about-logo img {
  height: 36px;
  width: auto;
}

.about-logo .t {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.about-logo .e {
  display: block;
  margin-top: 2px;
  font-family: var(--latin);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  color: var(--dim);
}

.about-copy > p {
  max-width: 540px;
  margin-top: 18px;
  font-size: 14.5px;
  line-height: 1.95;
  color: var(--muted);
}

.quote {
  max-width: 480px;
  margin-top: 34px;
  padding-left: 20px;
  border-left: 2px solid var(--blue);
  font-size: 20px;
  font-weight: 500;
  line-height: 1.65;
  color: #1e3a5f;
}

.quote small {
  display: block;
  margin-top: 10px;
  font-family: var(--latin);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.16em;
  color: var(--dim);
}

.about-est {
  margin-top: 30px;
  font-family: var(--latin);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: #a2afc0;
}

.timeline {
  position: relative;
  padding-left: 28px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 8px;
  bottom: 26px;
  width: 1px;
  background: #e2e9f2;
}

.tl-item {
  position: relative;
  padding-bottom: 34px;
}

.tl-item:last-child {
  padding-bottom: 0;
}

.tl-item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 4px #eaf2ff;
}

.tl-year {
  font-family: var(--latin);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--ink);
}

.tl-year small {
  margin-left: 8px;
  font-family: var(--latin);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--dim);
}

.tl-item p {
  margin-top: 8px;
  max-width: 440px;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 结尾 CTA ---------- */

.cta {
  padding: 80px 0;
  border-top: 1px solid var(--line-soft);
}

.cta-box {
  position: relative;
  overflow: hidden;
  padding: 76px 40px;
  border-radius: 12px;
  background: #0a1524 url("../img/bg-home.webp") center 42% / cover no-repeat;
  text-align: center;
  color: #fff;
}

.cta-box::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
      90deg,
      rgba(5, 13, 24, 0.9),
      rgba(5, 13, 24, 0.72) 52%,
      rgba(5, 13, 24, 0.88)
    ),
    linear-gradient(180deg, rgba(5, 13, 24, 0.18), rgba(5, 13, 24, 0.4));
}

.cta-box > * {
  position: relative;
  z-index: 1;
}

.cta-box .eyebrow {
  justify-content: center;
  color: rgba(255, 255, 255, 0.6);
}

.cta-box .eyebrow .rule {
  background: rgba(255, 255, 255, 0.4);
}

.cta-title {
  margin-top: 20px;
  font-size: clamp(30px, 3vw, 40px);
  line-height: 1.35;
  color: #fff;
}

.cta-sub {
  max-width: 560px;
  margin: 16px auto 0;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(226, 236, 248, 0.68);
}

.cta-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-top: 32px;
}

.cta .btn-gold {
  background: #fff;
  color: var(--blue);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.18);
}
.cta .btn-gold:hover {
  background: #eaf2ff;
  color: var(--blue-dark);
}
.cta .btn-line {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.32);
  color: #fff;
}
.cta .btn-line:hover {
  border-color: #fff;
  color: #fff;
}

/* ---------- 页脚 ---------- */

.site-footer {
  background: #f5f7fa;
  border-top: 1px solid var(--line);
  padding-top: 60px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
}

.footer-brand img {
  height: 56px;
  width: auto;
}

.footer-brand p {
  margin-top: 18px;
  font-size: 13px;
  line-height: 1.9;
  color: var(--muted);
}

.footer-col h4 {
  margin-bottom: 16px;
  font-family: var(--latin);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: #93a1b4;
}

.footer-col a,
.footer-col span {
  display: block;
  margin-bottom: 10px;
  font-size: 13.5px;
  line-height: 1.6;
  color: #4d5d72;
  transition: color 0.2s;
}

.footer-col a:hover {
  color: var(--blue);
}

.footer-domain {
  font-family: var(--latin);
  letter-spacing: 0.02em;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 46px;
  padding: 20px 0 26px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: #8b98aa;
}

/* ---------- 演示页 ---------- */

.demo-page {
  background: var(--bg-soft);
}

.demo-hero {
  padding: 44px 0 64px;
}

.demo-grid {
  display: grid;
  grid-template-columns: 1.06fr 0.94fr;
  gap: 28px;
  align-items: stretch;
}

.demo-copy {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 640px;
  padding: 54px 52px;
  border-radius: 12px;
  overflow: hidden;
  background: #0a1522;
  color: #fff;
}

.demo-copy-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 64% 50%;
}

.demo-copy::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      90deg,
      rgba(4, 11, 20, 0.94) 0%,
      rgba(4, 11, 20, 0.84) 46%,
      rgba(4, 11, 20, 0.48) 78%,
      rgba(4, 11, 20, 0.3) 100%
    ),
    linear-gradient(
      180deg,
      rgba(4, 11, 20, 0.25) 0%,
      transparent 40%,
      rgba(4, 11, 20, 0.55) 72%,
      rgba(4, 11, 20, 0.9) 100%
    );
}

.demo-copy > :not(.demo-copy-bg) {
  position: relative;
  z-index: 1;
}

.demo-copy .eyebrow {
  color: rgba(255, 255, 255, 0.6);
  font-weight: 400;
}

.demo-copy .eyebrow .rule {
  background: rgba(255, 255, 255, 0.45);
}

.demo-copy h1 {
  margin-top: 22px;
  font-size: clamp(32px, 3vw, 42px);
  line-height: 1.35;
  color: #fff;
}

.demo-copy > p {
  max-width: 460px;
  margin-top: 20px;
  font-size: 14.5px;
  line-height: 1.95;
  color: rgba(226, 236, 248, 0.72);
}

.demo-steps-mini {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 42px;
  padding-top: 26px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.demo-steps-mini::before {
  content: "";
  position: absolute;
  left: -52px;
  right: -52px;
  top: -46px;
  bottom: -120px;
  background: linear-gradient(
    180deg,
    rgba(4, 11, 20, 0) 0%,
    rgba(4, 11, 20, 0.6) 15%,
    rgba(4, 11, 20, 0.88) 32%,
    rgba(4, 11, 20, 0.93) 100%
  );
  z-index: -1;
  pointer-events: none;
}

.demo-step-mini .n {
  font-family: var(--latin);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: rgba(226, 236, 248, 0.52);
}

.demo-step-mini .t {
  margin-top: 7px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
}

.demo-step-mini .d {
  margin-top: 5px;
  font-size: 12px;
  line-height: 1.7;
  color: rgba(226, 236, 248, 0.62);
}

.gate {
  align-self: center;
  padding: 38px 38px 30px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 20px 50px rgba(22, 48, 88, 0.09);
}

.gate-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.gate-label {
  font-family: var(--latin);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--blue);
}

.gate-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: #2f7d4f;
}

.gate-status i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #34a853;
}

.gate-title {
  margin-top: 22px;
  font-size: 27px;
  line-height: 1.35;
}

.gate-sub {
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
}

.gate-rows {
  margin-top: 22px;
}

.gate-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}

.gate-row .k {
  font-size: 13.5px;
  color: var(--muted);
}

.gate-row .v {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13.5px;
  color: var(--ink);
  text-align: right;
}

.gate-row .dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #34a853;
}

.gate-actions {
  margin-top: 24px;
}

.gate-actions .btn {
  width: 100%;
}

.gate-hint {
  margin-top: 13px;
  font-size: 12px;
  line-height: 1.7;
  text-align: center;
  color: #8a97a8;
}

.gate-hint strong {
  font-weight: 500;
  color: #56667a;
}

.gate-account {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 20px;
  padding: 11px 14px;
  border: 1px dashed #dbe4f0;
  border-radius: 6px;
  font-size: 12.5px;
  color: var(--muted);
}

.gate-account code {
  margin-left: 6px;
  font-family: var(--sans);
  font-size: 12.5px;
  color: var(--ink);
}

/* 「演示账号 xxx」「密码 xxx」各自不拆行：窄屏只在中间的「·」处换行，
   不会出现"密码"和密码值分家（390 宽实测）。 */
.gate-account .ga-item { white-space: nowrap; }
/* 分隔点跟着"密码"一起走：窄屏换行时不会留下一个孤零零的「·」 */
.gate-account .ga-pwd::before { content: "·"; margin: 0 6px; color: var(--dim); }

.copy-btn {
  font-size: 12px;
  color: var(--blue);
  white-space: nowrap;
}

.demo-steps {
  padding: 76px 0;
  background: var(--bg-soft);
}

.demo-steps-head {
  text-align: center;
}

.demo-steps-head h2 {
  font-size: clamp(26px, 2.4vw, 32px);
  line-height: 1.4;
}

.demo-steps-head p {
  margin-top: 10px;
  font-size: 14px;
  color: var(--muted);
}

.demo-step-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.demo-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  transition: box-shadow 0.25s, transform 0.25s var(--ease);
}

.demo-card:hover {
  box-shadow: 0 18px 40px rgba(19, 51, 100, 0.09);
  transform: translateY(-3px);
}

.demo-card .shot {
  aspect-ratio: 16 / 9;
  background: #0b1626;
  overflow: hidden;
}

.demo-card .shot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.demo-card .body {
  padding: 24px 24px 26px;
}

.demo-card .no {
  font-family: var(--latin);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--blue);
}

.demo-card h3 {
  margin-top: 8px;
  font-size: 18px;
}

.demo-card p {
  margin-top: 9px;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
}

.demo-notice {
  padding: 0 0 76px;
  background: var(--bg-soft);
}

.notice-box {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  padding: 30px 32px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
}

.notice-item {
  display: flex;
  gap: 12px;
}

.notice-item .n {
  font-family: var(--latin);
  font-size: 11px;
  font-weight: 600;
  color: var(--blue);
  padding-top: 2px;
}

.notice-item p {
  font-size: 13px;
  line-height: 1.85;
  color: var(--muted);
}

.notice-item b {
  display: block;
  margin-bottom: 4px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}

.demo-page .cta {
  background: var(--bg-soft);
}

/* ---------- 响应式 ---------- */

@media (max-width: 1180px) {
  :root {
    --gutter: 32px;
  }

  .nav {
    gap: 24px;
  }

  .header-actions {
    margin-left: 24px;
  }

  .product-head,
  .cap-head,
  .delivery-head {
    gap: 48px;
  }

  .twin-grid,
  .about-grid {
    gap: 48px;
  }

  .tiers {
    grid-template-columns: repeat(3, 1fr);
  }

  .tier {
    min-height: 240px;
  }

  .cap-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .cap-card--feature {
    grid-column: span 1;
  }

  .hero-stats {
    grid-template-columns: repeat(3, 1fr);
    row-gap: 22px;
    padding: 24px 8px;
  }

  .stat:nth-child(4) {
    border-left: 0;
  }

  .arch {
    padding-inline: 22px;
  }
}

@media (max-width: 1024px) {
  .nav {
    display: none;
  }

  .header-actions {
    margin-left: auto;
  }

  .menu-toggle {
    display: flex;
  }

  .hero .container {
    padding: 84px 0 130px;
  }

  .hero-copy {
    max-width: 560px;
  }

  .twin-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .twin-points {
    max-width: 640px;
  }

  .twin-visual {
    max-width: 720px;
  }

  .twin-chip--a {
    left: 18px;
  }

  .twin-chip--b {
    right: 18px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 52px;
  }

  .about-copy > p {
    max-width: 640px;
  }

  .sec-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .demo-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .demo-copy {
    min-height: 480px;
  }

  .gate {
    max-width: 560px;
    width: 100%;
    justify-self: center;
  }

  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
    row-gap: 36px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 900px) {
  .sec {
    padding: 76px 0;
  }

  .product {
    padding-top: 70px;
  }

  .product-head,
  .cap-head,
  .delivery-head {
    grid-template-columns: 1fr;
    gap: 18px;
    margin-bottom: 34px;
  }

  .product-head .sec-lead,
  .cap-head .sec-lead,
  .delivery-head .sec-lead {
    max-width: 640px;
  }

  .stage {
    padding: 18px;
  }

  .showcase-notes {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  /* 6 个标签在平板宽度放不下一行：改为两列网格，避免最后一个被横滑藏住 */
  .tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    overflow: visible;
    border-bottom: 0;
    margin-bottom: 18px;
  }

  .tab {
    padding: 11px 10px;
    margin-bottom: 0;
    border-bottom: 1px solid var(--line);
    font-size: 13.5px;
  }

  .tab.is-active {
    border-bottom: 2px solid var(--blue);
  }

  .cap-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .cap-card--feature {
    grid-column: span 2;
    display: grid;
    grid-template-columns: auto 1fr;
    grid-template-areas: "icon title" "icon desc";
    column-gap: 24px;
    row-gap: 6px;
    align-items: start;
    min-height: 0;
    padding: 26px 28px;
  }

  .cap-card--feature .cap-top {
    grid-area: icon;
    flex-direction: column;
    gap: 12px;
    margin: 0;
  }

  .cap-card--feature h3 {
    grid-area: title;
  }

  .cap-card--feature p {
    grid-area: desc;
    margin-top: 0;
    max-width: 760px;
  }

  .cap-card {
    min-height: 0;
  }

  .flow {
    grid-template-columns: repeat(2, 1fr);
    gap: 34px 24px;
  }

  .flow-line {
    display: none;
  }

  .flow-step h3 {
    margin-top: 14px;
  }

  .tiers {
    grid-template-columns: repeat(2, 1fr);
  }

  .arch svg {
    display: none;
  }

  .arch-m {
    display: block;
  }

  .am-block {
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: #f8fafc;
  }

  .am-block.am-core {
    background: #f1f6ff;
    border-color: #cfe0f8;
  }

  .am-k {
    font-family: var(--latin);
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--blue);
  }

  .am-t {
    margin-top: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--ink);
  }

  .am-s {
    margin-top: 4px;
    font-size: 12px;
    line-height: 1.7;
    color: var(--muted);
  }

  .am-link {
    width: 1px;
    height: 18px;
    margin: 6px auto;
    background: #d5e1f1;
  }

  .arch figcaption {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    row-gap: 22px;
    padding: 24px 8px;
  }

  .stat:nth-child(3),
  .stat:nth-child(5) {
    border-left: 0;
  }

  .stat:nth-child(4) {
    border-left: 1px solid var(--line-soft);
  }

  .demo-step-grid {
    grid-template-columns: 1fr;
    max-width: 640px;
    margin-inline: auto;
  }

  .notice-box {
    grid-template-columns: 1fr;
    gap: 22px;
  }
}

@media (max-width: 760px) {
  :root {
    --gutter: 22px;
    --header: 68px;
  }

  .brand-logo {
    height: 27px;
  }

  .btn-header {
    height: 34px;
    padding: 0 14px;
    font-size: 13px;
  }

  .hero {
    min-height: 0;
  }

  .hero .container {
    padding: 68px 0 118px;
  }

  .hero h1 {
    margin-top: 20px;
    font-size: clamp(32px, 8.6vw, 44px);
  }

  .hero-sub {
    margin-top: 18px;
    font-size: 12px;
    line-height: 1.85;
  }

  .hero-cta {
    flex-wrap: wrap;
    gap: 18px;
    margin-top: 28px;
  }

  .hero-note {
    font-size: 12px;
  }

  .hero-media img {
    object-position: 70% 50%;
  }

  .hero-shade {
    background:
      linear-gradient(
        90deg,
        rgba(4, 10, 18, 0.93) 0%,
        rgba(4, 10, 18, 0.8) 60%,
        rgba(4, 10, 18, 0.5) 100%
      ),
      linear-gradient(180deg, rgba(4, 10, 18, 0.35), rgba(4, 10, 18, 0.62));
  }

  .hero-stats-wrap {
    margin-top: -52px;
  }

  .stat {
    padding: 0 20px;
  }

  .stat-num {
    font-size: 30px;
  }

  .stat-label {
    font-size: 12.5px;
  }

  .sec {
    padding: 60px 0;
  }

  .sec-title {
    font-size: clamp(25px, 6.4vw, 30px);
  }

  .sec-lead {
    font-size: 14.5px;
  }

  .note-group {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .stage {
    padding: 10px;
    border-radius: 8px;
  }

  .panel-cap {
    padding: 10px 12px;
  }

  .cap-name {
    font-size: 12px;
  }

  .cap-note {
    display: none;
  }

  .cap-grid {
    gap: 14px;
  }

  .cap-card {
    padding: 24px 22px;
  }

  .twin-points {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .twin-chip {
    padding: 8px 12px;
  }

  .twin-chip--a {
    top: 12px;
    left: 12px;
  }

  .twin-chip--b {
    right: 12px;
    bottom: 16px;
  }

  .flow {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .flow-step {
    display: grid;
    grid-template-columns: 46px 1fr;
    column-gap: 16px;
    align-items: start;
  }

  .flow-step h3 {
    margin-top: 10px;
    grid-column: 2;
  }

  .flow-step p {
    grid-column: 2;
    margin-top: 4px;
  }

  .tiers {
    grid-template-columns: 1fr;
  }

  .tier {
    min-height: 0;
  }

  .arch {
    padding: 22px 16px 14px;
  }

  .sec-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .sec-foot {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .about-logo img {
    height: 32px;
  }

  .quote {
    font-size: 18px;
  }

  .cta {
    padding: 56px 0;
  }

  .cta-box {
    padding: 56px 22px;
    border-radius: 10px;
  }

  .cta-title {
    font-size: clamp(26px, 7vw, 32px);
  }

  .cta-actions {
    flex-direction: column;
    gap: 10px;
  }

  .cta-actions .btn {
    width: 100%;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }

  .footer-brand,
  .footer-col:last-child {
    grid-column: 1 / -1;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .demo-hero {
    padding: 24px 0 48px;
  }

  .demo-grid {
    display: flex;
    flex-direction: column;
  }

  .gate {
    order: -1;
  }

  .demo-copy {
    min-height: 0;
    padding: 0 24px 32px;
    justify-content: flex-start;
    border-radius: 10px;
  }

  .demo-copy > .demo-copy-bg {
    position: relative;
    inset: auto;
    width: calc(100% + 48px);
    max-width: none;
    height: 210px;
    margin: 0 -24px 28px;
    object-position: 62% 55%;
  }

  .demo-copy::before,
  .demo-steps-mini::before {
    display: none;
  }

  .demo-copy h1 {
    font-size: clamp(28px, 7.6vw, 36px);
  }

  .demo-steps-mini {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
    margin-top: 30px;
    padding-top: 22px;
  }

  .demo-step-mini:last-child {
    grid-column: 1 / -1;
  }

  .gate {
    padding: 28px 22px 24px;
  }

  .gate-title {
    font-size: 24px;
  }

  .demo-steps {
    padding: 56px 0;
  }

  .demo-notice {
    padding-bottom: 56px;
  }

  .notice-box {
    padding: 24px 22px;
  }
}

@media (max-width: 600px) {
  .cap-grid {
    grid-template-columns: 1fr;
  }

  .cap-card--feature {
    grid-column: span 1;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    min-height: 212px;
    padding: 28px 26px 26px;
  }

  .cap-card--feature .cap-top {
    flex-direction: row;
    justify-content: space-between;
    margin-bottom: 22px;
  }

  .cap-card--feature p {
    margin-top: 9px;
    max-width: none;
  }
}

@media (max-width: 480px) {
  /* 新字标比原来的「H + 两行字」宽；窄屏把顶栏演示按钮收进菜单，避免挤爆 */
  .btn-header {
    display: none;
  }

  .stat {
    padding: 0 14px;
  }

  .stat-num {
    font-size: 27px;
  }

  .stat-num small {
    font-size: 12px;
  }

  .hero-stats {
    padding: 20px 4px;
  }

  .gate-row {
    padding: 11px 0;
  }

  .demo-copy {
    padding: 0 18px 28px;
  }

  .demo-copy > .demo-copy-bg {
    width: calc(100% + 36px);
    height: 190px;
    margin: 0 -18px 24px;
  }

  .demo-copy > p {
    font-size: 13.5px;
  }

  .demo-steps-mini {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .demo-step-mini:last-child {
    grid-column: auto;
  }
}

/* ---------- 低动态偏好 ---------- */

/* 八项标签：窄屏改 4×2 网格，保证 07 / 08 不被横向滚动藏住 */
@media (max-width: 1180px) {
  .tabs--eight {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    overflow: visible;
    border-bottom: 0;
    margin-bottom: 18px;
  }

  .tabs--eight .tab {
    min-width: 0;
    justify-content: flex-start;
    padding: 11px 10px;
    margin-bottom: 0;
    border-bottom: 1px solid var(--line);
    font-size: 13.5px;
    gap: 7px;
  }

  .tabs--eight .tab.is-active {
    border-bottom: 2px solid var(--blue);
  }
}

@media (max-width: 600px) {
  .tabs--eight {
    grid-template-columns: repeat(2, 1fr);
  }

  .tabs--eight .tab {
    padding: 10px 8px;
    font-size: 13px;
  }

  .scene-tag {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero-media img {
    animation: none;
    transform: none;
  }

  .hero-copy {
    animation: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn,
  .cap-card,
  .tier,
  .demo-card,
  .link-more .line,
  .nav a::after {
    transition: none;
  }
}