:root {
  --em-ink: #151518;
  --em-paper: #f6f6f2;
  --em-soft: #ecece7;
  --em-white: #f3f3ef;
  --em-red: #e8112d;
  --em-red-bright: #ff2740;
  --em-muted: #8b8b94;
  --em-line: rgba(17, 17, 20, 0.12);
  --em-ease-enter: cubic-bezier(.16, 1, .3, 1);
  --em-ease-exit: cubic-bezier(.7, 0, .84, 0);
  --em-ease-micro: cubic-bezier(.2, .8, .2, 1);
  --em-micro: 180ms;
  --em-enter: 560ms;
  --em-exit: 260ms;
}

html {
  scroll-behavior: smooth;
  background: var(--em-ink);
}

body {
  overflow-x: hidden;
}

html.em-motion-boot #dc-root {
  opacity: 0;
}

html.em-motion-ready #dc-root {
  opacity: 1;
  transition: opacity 240ms var(--em-ease-enter);
}

#dc-root,
#dc-root > .sc-host {
  min-width: 320px;
}

/* Header rhythm */
#dc-root header {
  border-bottom: 1px solid rgba(245, 245, 242, 0.1);
  box-sizing: border-box;
  transition: transform var(--em-enter) var(--em-ease-enter),
              background-color var(--em-micro) ease,
              border-color var(--em-micro) ease;
}

html.em-page-enter #dc-root header {
  animation: emHeaderIn 520ms var(--em-ease-enter) both;
}

#dc-root header nav > a,
#dc-root header nav > div > a,
#dc-root header nav > div > span {
  position: relative;
  transition: color var(--em-micro) ease, opacity var(--em-micro) ease;
}

#dc-root header nav > a {
  display: flex;
  align-items: center;
  height: 64px;
  box-sizing: border-box;
}

#dc-root header nav > a::after,
#dc-root header nav > div > a::after,
#dc-root header nav > div > span::after {
  position: absolute;
  right: 0;
  bottom: 8px;
  left: 0;
  height: 1px;
  background: var(--em-red-bright);
  content: "";
  opacity: 0;
  transform: scaleX(0);
  transform-origin: left;
  transition: opacity var(--em-micro) ease, transform var(--em-micro) var(--em-ease-micro);
}

#dc-root header nav > a[style*="background:#F5F5F2"]::after,
#dc-root header nav > a.em-dev-platform::after,
#dc-root header nav > a[href*="EAIMANTE_品牌登录页_1.html"]::after {
  display: none;
}

#dc-root header nav > a[style*="background:#F5F5F2"],
#dc-root header nav > a.em-dev-platform,
#dc-root header nav > a[href*="EAIMANTE_品牌登录页_1.html"] {
  align-self: center;
  height: 40px !important;
  min-height: 40px;
  margin: 12px 0;
  padding: 0 18px !important;
  transform: none !important;
  box-shadow: 0 0 0 var(--em-red-bright) !important;
}

#dc-root header nav > a[style*="background:#F5F5F2"]:hover,
#dc-root header nav > a[style*="background:#F5F5F2"]:focus-visible,
#dc-root header nav > a.em-dev-platform:hover,
#dc-root header nav > a.em-dev-platform:focus-visible,
#dc-root header nav > a[href*="EAIMANTE_品牌登录页_1.html"]:hover,
#dc-root header nav > a[href*="EAIMANTE_品牌登录页_1.html"]:focus-visible {
  translate: -2px -2px !important;
  box-shadow: 4px 4px 0 var(--em-red-bright) !important;
}

#dc-root header nav > a[style*="background:#F5F5F2"]:active,
#dc-root header nav > a.em-dev-platform:active,
#dc-root header nav > a[href*="EAIMANTE_品牌登录页_1.html"]:active {
  translate: 0 0 !important;
  box-shadow: 1px 1px 0 var(--em-red-bright) !important;
}

.em-cta-action {
  box-sizing: border-box;
  transform: none !important;
  translate: 0 0;
  box-shadow: 0 0 0 var(--em-red-bright) !important;
  transition: color var(--em-micro) ease,
              border-color var(--em-micro) ease,
              translate 120ms var(--em-ease-micro),
              box-shadow 120ms var(--em-ease-micro) !important;
}

.em-cta-action:hover,
.em-cta-action:focus-visible {
  translate: -2px -2px !important;
  box-shadow: 4px 4px 0 var(--em-red-bright) !important;
}

.em-cta-action:active {
  translate: 0 0 !important;
  box-shadow: 1px 1px 0 var(--em-red-bright) !important;
}

#dc-root header nav > a:hover::after,
#dc-root header nav > div > a:hover::after,
#dc-root header nav > div > span:hover::after {
  opacity: 1;
  transform: scaleX(1);
}

#dc-root header nav > div > div[style*="position:absolute"] {
  animation: emDropdownIn 220ms var(--em-ease-enter) both;
  transform-origin: top left;
}

#dc-root header nav > button {
  min-height: 36px;
  box-sizing: border-box;
}

/* Section color and background system */
.em-section {
  position: relative;
  isolation: isolate;
  overflow: clip;
  transition: background-color 420ms ease;
}

.em-section.em-tone-dark { background: var(--em-ink) !important; }
.em-section.em-tone-paper { background: var(--em-paper) !important; }
.em-section.em-tone-soft { background: var(--em-soft) !important; }
.em-section.em-tone-white { background: var(--em-white) !important; }

.em-section > :not(.em-background-field):not(.em-handoff) {
  position: relative;
  z-index: 1;
}

.em-background-field {
  position: absolute;
  inset: -32px;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.em-field-grid {
  position: absolute;
  inset: -40px;
  color: rgba(17, 17, 20, 0.11);
  background-image: radial-gradient(circle at center, currentColor 1px, transparent 1.25px);
  background-position: 0 0;
  background-size: 38px 38px;
  opacity: 0.42;
  will-change: transform;
}

.em-tone-dark .em-field-grid {
  color: rgba(245, 245, 242, 0.17);
  opacity: 0.3;
}

.em-signal-track {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 1px;
  background: color-mix(in srgb, var(--em-red) 42%, transparent);
  opacity: 0.7;
  transform: scaleY(0);
  transform-origin: top;
  will-change: transform;
}

.em-signal-node {
  position: absolute;
  top: 0;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--em-red-bright);
  box-shadow: 0 0 0 4px rgba(232, 17, 45, 0.09);
  will-change: transform;
}

.em-signal-track,
.em-signal-node {
  display: none !important;
}

.em-signal-node::after {
  position: absolute;
  inset: -8px;
  border: 1px solid rgba(232, 17, 45, 0.45);
  border-radius: 50%;
  content: "";
  animation: emSignalRing 2.4s ease-out infinite;
}

.em-handoff {
  position: absolute;
  right: clamp(24px, 5vw, 72px);
  bottom: -22px;
  z-index: 4;
  width: 1px;
  height: 44px;
  background: rgba(232, 17, 45, 0.34);
  pointer-events: none;
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 520ms var(--em-ease-enter) 160ms;
}

.em-handoff::after {
  position: absolute;
  right: -3px;
  bottom: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--em-red-bright);
  content: "";
  opacity: 0;
  transition: opacity 180ms ease 420ms;
}

.em-section-in .em-handoff { transform: scaleY(1); }
.em-section-in .em-handoff::after { opacity: 1; }

.em-flow-item {
  opacity: 0;
  translate: 0 38px;
  transition: opacity var(--em-enter) var(--em-ease-enter),
              translate var(--em-enter) var(--em-ease-enter);
  transition-delay: var(--em-flow-delay, 0ms);
}

.em-section-in > .em-flow-item {
  opacity: 1;
  translate: 0 0;
}

.em-hero-banner > .em-flow-item {
  will-change: translate, opacity;
}

/* Homepage banner: vertical spatial continuity */
#base .em-carousel-wrap {
  aspect-ratio: 1920 / 720;
}

#base .em-carousel-track {
  display: flex !important;
  flex-direction: column !important;
  height: 100%;
  transition: transform 420ms var(--em-ease-enter) !important;
  will-change: transform;
}

#base .em-carousel-track > div {
  flex: 0 0 100% !important;
  width: 100% !important;
  height: 100%;
}

#base .em-carousel-track > div > div {
  width: 100%;
  height: 100%;
  aspect-ratio: auto !important;
}

#base::before,
#base::after {
  display: none;
  content: none;
}

.em-hero-line {
  display: block;
}

.em-hero-line-primary {
  white-space: nowrap;
}

/* Homepage hero: wide signal-topology composition */
.em-hero-layout {
  max-width: 1600px;
  min-height: min(900px, calc(100svh - 64px));
  padding: clamp(104px, 14vh, 148px) clamp(28px, 5vw, 84px) clamp(112px, 15vh, 164px);
  grid-template-columns: minmax(0, 1.06fr) minmax(430px, .94fr) !important;
  gap: clamp(46px, 6vw, 108px) !important;
}

.em-hero-copy {
  min-width: 0;
  padding-left: clamp(0px, 1.5vw, 24px);
}

.em-hero-copy h1 {
  max-width: 820px !important;
}

.em-hero-visual {
  width: min(620px, 100%);
  min-width: 0;
  justify-self: end;
}

.em-hero-visual canvas {
  filter: drop-shadow(12px 14px 18px rgba(17, 17, 20, .08));
}

/* Scene cards share one baseline; the following light band steps up in tone. */
#scenes {
  background: #e9e9e4 !important;
}

#scenes + section[data-screen-label="关于"] {
  background: #f7f7f3 !important;
  border-top: 1px solid rgba(17, 17, 20, .08);
}

/* Imported education card may be cached independently; suppress its duplicated image caption. */
[data-sc-name="教育机器人 卡片图"] [style*="bottom: 96px"] {
  display: none !important;
}

#base .em-carousel-slide {
  opacity: 0.68;
  translate: 0 26px;
  transition: opacity 220ms ease, translate 420ms var(--em-ease-enter);
}

#base .em-carousel-slide.em-slide-active {
  opacity: 1;
  translate: 0 0;
}

#base .em-carousel-slide.em-slide-out {
  opacity: 0;
  translate: 0 -26px;
  transition-duration: var(--em-exit);
  transition-timing-function: var(--em-ease-exit);
}

#base .em-carousel-slide:not(.em-slide-active):not(.em-slide-out) * {
  animation-play-state: paused !important;
}

#base button[aria-label="上一张"] {
  top: 20px !important;
  right: 20px !important;
  left: auto !important;
  transform: none !important;
}

#base button[aria-label="下一张"] {
  top: auto !important;
  right: 20px !important;
  bottom: 20px !important;
  left: auto !important;
  transform: none !important;
}

/* Buttons, cards and form controls */
.em-interactive {
  touch-action: manipulation;
  transition: color var(--em-micro) ease,
              border-color var(--em-micro) ease,
              background-color var(--em-micro) ease,
              box-shadow var(--em-micro) var(--em-ease-micro),
              opacity var(--em-micro) ease,
              translate var(--em-micro) var(--em-ease-micro),
              scale 120ms ease !important;
}

.em-interactive:hover { translate: 0 -2px; }
.em-interactive:active { translate: 0 1px; scale: 0.985; }

.em-interactive:focus-visible {
  outline: 2px solid var(--em-red-bright);
  outline-offset: 3px;
}

.em-surface {
  transition: border-color var(--em-micro) ease,
              box-shadow 240ms var(--em-ease-micro),
              translate 240ms var(--em-ease-micro) !important;
  will-change: translate;
}

.em-surface:hover {
  border-color: var(--em-ink) !important;
  box-shadow: 6px 6px 0 rgba(17, 17, 20, 0.1) !important;
  translate: -2px -2px;
}

.em-tone-dark .em-surface:hover {
  border-color: rgba(245, 245, 242, 0.6) !important;
  box-shadow: 5px 5px 0 rgba(232, 17, 45, 0.24) !important;
}

.em-form-control {
  transition: border-color var(--em-micro) ease,
              background-color var(--em-micro) ease,
              box-shadow var(--em-micro) ease !important;
}

.em-form-control:focus,
.em-form-control:focus-visible {
  outline: none;
  border-color: #111114 !important;
  box-shadow: 2px 2px 0 #FDECEE;
}

/* One continuous signal element on every route */
.em-site-thread {
  position: fixed;
  top: 92px;
  right: 18px;
  bottom: 28px;
  z-index: 24;
  width: 1px;
  background: rgba(139, 139, 148, 0.24);
  pointer-events: none;
}

.em-site-thread::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 100%;
  background: var(--em-red);
  content: "";
  opacity: 0.34;
  transform: scaleY(var(--em-thread-scale, 0));
  transform-origin: top;
}

.em-site-thread-node {
  position: absolute;
  top: 0;
  left: -3px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--em-red-bright);
  box-shadow: 0 0 0 4px rgba(232, 17, 45, 0.09);
  will-change: transform;
}

.em-site-thread-node::after {
  position: absolute;
  inset: -6px;
  border: 1px solid rgba(232, 17, 45, 0.38);
  border-radius: 50%;
  content: "";
  animation: emSignalRing 2.4s ease-out infinite;
}

/* Mobile navigation */
.em-menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid #3a3a42;
  border-radius: 2px;
  background: transparent;
  color: #f5f5f2;
  cursor: pointer;
}

.em-menu-icon,
.em-menu-icon::before,
.em-menu-icon::after {
  display: block;
  width: 18px;
  height: 1px;
  background: currentColor;
  content: "";
  transition: transform 220ms var(--em-ease-enter), opacity 180ms ease;
}

.em-menu-icon { position: relative; }
.em-menu-icon::before { position: absolute; top: -6px; left: 0; }
.em-menu-icon::after { position: absolute; top: 6px; left: 0; }
.em-menu-toggle[aria-expanded="true"] .em-menu-icon { background: transparent; }
.em-menu-toggle[aria-expanded="true"] .em-menu-icon::before { top: 0; transform: rotate(45deg); }
.em-menu-toggle[aria-expanded="true"] .em-menu-icon::after { top: 0; transform: rotate(-45deg); }

.em-mobile-menu {
  position: fixed;
  top: 64px;
  right: 0;
  left: 0;
  z-index: 79;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  padding: 16px;
  border-top: 1px solid #26262c;
  background: var(--em-ink);
  box-shadow: 0 16px 28px rgba(0, 0, 0, 0.24);
  opacity: 0;
  pointer-events: none;
  translate: 0 -14px;
  transition: opacity 220ms ease, translate 260ms var(--em-ease-enter);
}

.em-mobile-menu.em-open {
  opacity: 1;
  pointer-events: auto;
  translate: 0 0;
}

.em-mobile-menu a,
.em-mobile-menu button {
  min-height: 48px;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 12px 14px;
  border: 1px solid #2f2f35;
  border-radius: 2px;
  background: #17171b;
  color: #f5f5f2;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.em-mobile-menu a::before {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--em-red-bright);
  content: "";
}

/* Cross-page transition */
.em-route-curtain {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: var(--em-ink);
  color: #f5f5f2;
  translate: 0 100%;
  transition: translate 300ms var(--em-ease-enter);
}

.em-route-curtain.em-cover { translate: 0 0; }
.em-route-curtain.em-reveal { translate: 0 -100%; transition-duration: 420ms; }

.em-route-mark {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  font-family: 'SF Mono', 'JetBrains Mono', Menlo, Consolas, monospace;
  font-size: 10px;
  letter-spacing: .22em;
  color: #b9b9bf;
}

.em-route-dots {
  display: grid;
  grid-template-columns: repeat(3, 6px);
  gap: 7px;
}

.em-route-dots i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #f5f5f2;
}

.em-route-dots i:nth-child(5) {
  background: var(--em-red-bright);
  animation: emRouteNode 600ms var(--em-ease-enter) infinite alternate;
}

html.em-route-leaving #dc-root {
  opacity: 0.72;
  translate: 0 -12px;
  transition: opacity var(--em-exit) var(--em-ease-exit),
              translate var(--em-exit) var(--em-ease-exit);
}

@keyframes emHeaderIn {
  from { opacity: 0; transform: translateY(-12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes emDropdownIn {
  from { opacity: 0; transform: translateY(-8px) scale(.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes emSignalRing {
  from { opacity: .7; transform: scale(.35); }
  to { opacity: 0; transform: scale(1.35); }
}

@keyframes emRouteNode {
  from { opacity: .45; transform: scale(.65); }
  to { opacity: 1; transform: scale(1.2); }
}

@media (max-width: 1120px) {
  .em-hero-layout {
    min-height: auto;
    padding: 108px clamp(24px, 6vw, 64px) 120px;
    grid-template-columns: minmax(0, 1fr) !important;
    gap: 56px !important;
  }
  .em-hero-copy { padding-left: 0; }
  .em-hero-visual {
    width: min(620px, 100%);
    justify-self: center;
  }
}

@media (max-width: 980px) {
  #dc-root header { padding-right: 16px !important; padding-left: 20px !important; }
  .em-menu-toggle { display: inline-flex; }
  .em-site-thread { right: 8px; opacity: .7; }
  .em-handoff { right: 20px; }
  .em-section [style*="grid-template-columns:repeat(4"] {
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
  }
  .em-section [style*="grid-template-columns:repeat(3"] {
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
  }
  #base button[aria-label="上一张"],
  #base button[aria-label="下一张"] { right: 12px !important; }
}

@media (max-width: 760px) {
  .em-hero-line-primary { white-space: normal; }
  .em-hero-layout {
    padding: 92px 22px 104px;
    gap: 42px !important;
  }
  .em-hero-visual { gap: 12px !important; }
  .em-section [style*="grid-template-columns:repeat(2"] {
    grid-template-columns: minmax(0, 1fr) !important;
  }
}

@media (max-width: 560px) {
  .em-mobile-menu { grid-template-columns: 1fr; max-height: calc(100dvh - 64px); overflow-y: auto; }
  .em-field-grid { background-size: 30px 30px; }
  .em-handoff { height: 32px; bottom: -16px; }
  .em-section [style*="grid-template-columns"] {
    grid-template-columns: minmax(0, 1fr) !important;
  }
  .em-section [style*="minmax(320px"] {
    grid-template-columns: minmax(0, 1fr) !important;
  }
  #base button[aria-label="上一张"],
  #base button[aria-label="下一张"] { width: 36px !important; height: 36px !important; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  html.em-motion-boot #dc-root { opacity: 1; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .001ms !important;
  }
  .em-flow-item,
  .em-section-in > .em-flow-item {
    opacity: 1;
    translate: none;
  }
  .em-field-grid,
  .em-signal-node,
  .em-site-thread { transform: none !important; }
}

/* ============================================================
   Phase-D 追加 · P1-2 移动端折叠导航(≤760px 生效,桌面零影响)
   独立移动菜单:.em-menu-toggle + .em-mobile-menu
   ============================================================ */
@media (max-width: 760px) {
  #dc-root header > nav { display: none !important; }
  .em-menu-toggle { display: inline-flex; }
  /* Footer 移动端隐藏 Solution 和 Service 列 */
  #dc-root footer [style*="grid-template-columns"] > div:nth-child(2),
  #dc-root footer [style*="grid-template-columns"] > div:nth-child(3) {
    display: none !important;
  }
}

/* ============================================================
   Phase-D 追加 · P1-3(部分)键盘焦点可见
   仅 :focus-visible(鼠标点击不触发),信号红描边符合品牌语法
   ============================================================ */
#dc-root a:focus-visible,
#dc-root button:focus-visible,
#dc-root [tabindex]:focus-visible {
  outline: 2px solid #E8112D;
  outline-offset: 2px;
}

/* 表单控件:焦点指示走设计稿的黑边框 + 淡粉阴影,不用红色 outline
   (input/textarea/select 鼠标点击也会匹配 :focus-visible,故显式关闭) */
#dc-root input:focus-visible,
#dc-root textarea:focus-visible,
#dc-root select:focus-visible {
  outline: none;
}