@font-face {
  font-family: "Xiangshao Display";
  src: url("public/fonts/noto-sans-sc-display.woff") format("woff");
  font-weight: 900;
  font-style: normal;
  font-display: swap;
}
:root {
  --paper: #f4f0e8;
  --white: #fff;
  --ink: #111210;
  --muted: #50534f;
  --blue: #0049bd;
  --orange: #d83e00;
  --line: #d4d1c8;
  --gutter: clamp(24px, 4.9vw, 84px);
  --ease: cubic-bezier(0.22, 0.8, 0.22, 1);
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
button,
a {
  -webkit-tap-highlight-color: transparent;
}
button {
  font: inherit;
  color: inherit;
}
a {
  color: inherit;
  text-decoration: none;
}
img {
  display: block;
  max-width: 100%;
  height: auto;
}
button {
  cursor: pointer;
}
button:disabled {
  cursor: default;
}
figure,
p,
h1,
h2,
h3 {
  margin: 0;
}
button {
  border: 0;
}
::selection {
  background: var(--blue);
  color: white;
}
:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 5px;
}
button:focus-visible {
  position: relative;
  z-index: 4;
}
.skip {
  position: fixed;
  left: 16px;
  top: -100px;
  background: var(--ink);
  color: white;
  z-index: 50;
  padding: 14px 20px;
}
.skip:focus {
  top: 12px;
}
.site-header {
  height: clamp(65px, 6.35vw, 88px);
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--paper);
  border-bottom: 1px solid var(--blue);
  position: relative;
  z-index: 10;
}
.brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}
.brand img {
  mix-blend-mode: multiply;
  clip-path: inset(2.4% 0 3.2%);
  width: clamp(118px, 14vw, 173px);
  height: auto;
}
.brand > span {
  display: none;
}
.site-header nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(34px, 7.9vw, 120px);
  font-weight: 600;
  font-size: clamp(14px, 1.58vw, 18px);
}
.site-header nav a {
  white-space: nowrap;
  transition: color 0.2s;
}
.site-header nav a:hover {
  color: var(--blue);
}
.site-header .nav-cta {
  border: 1.5px solid var(--blue);
  border-radius: 100px;
  padding: 6px 22px;
  color: var(--blue);
}
.menu-toggle {
  display: none;
  background: none;
  padding: 12px;
}
/* 全站哨子鼠标：哨子图案，锚点落在哨嘴尖 */
:root {
  --cursor-whistle: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='34' height='34' viewBox='0 0 34 34'%3E%3Cg transform='rotate(-24 17 17)'%3E%3Crect x='3' y='12' width='17' height='13' rx='6.5' fill='%23d83e00' stroke='%23ffffff' stroke-width='1.7'/%3E%3Crect x='17' y='14.5' width='13' height='7.5' rx='3.2' fill='%23d83e00' stroke='%23ffffff' stroke-width='1.7'/%3E%3Ccircle cx='9.5' cy='18.5' r='2.7' fill='%23ffffff'/%3E%3C/g%3E%3C/svg%3E") 27 18;
}
body {
  cursor: var(--cursor-whistle), auto;
}
a, button, summary, [role="tab"], [role="button"], input, select, textarea, label, video {
  cursor: var(--cursor-whistle), pointer;
}

/* 通用组件（首屏与各区共用） */
.blue {
  color: var(--blue);
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 11px 24px;
  white-space: nowrap;
  font-weight: 650;
  transition:
    background 0.2s,
    transform 0.2s;
}
.primary {
  background: var(--orange);
  color: white;
}
.primary:hover {
  background: #b73300;
  transform: translateY(-2px);
}
.text-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--blue);
  font-weight: 650;
  text-underline-offset: 5px;
}
.text-link:hover {
  text-decoration: underline;
}
.image-open {
  display: block;
  background: transparent;
  padding: 0;
  width: 100%;
  text-align: left;
  position: relative;
  overflow: hidden;
}
/* 功能演示视频：悬停/聚焦自动播放，静置时与截图一致 */
.image-open video.demo-hover {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.35s var(--ease);
  pointer-events: none;
  background: #e9eef2;
}
.image-open video.demo-hover.is-playing { opacity: 1; }
.image-open video.demo-hover[data-aspect="phone"] {
  object-fit: contain;
  background: #0d1520;
}
.image-open img {
  width: 100%;
  transition: filter 0.2s;
}
.image-open:hover img {
  filter: brightness(0.98);
}
/* 介绍视频 */
.intro-video .section-heading {
  margin-bottom: 28px;
}
.video-frame {
  max-width: 980px;
  margin: 0 auto;
  border: 6px solid var(--ink);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 24px 60px #1112101f;
  background: #0d0f12;
}
.video-frame video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  height: auto;
}

.tool-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--blue) url("public/editorial/court-blue-1440.webp")
    center/cover;
  padding: 2.35vw 5%;
  color: white;
  gap: 24px;
  min-height: 12vw;
}
.tool-strip h2 {
  font-size: clamp(26px, 5.1vw, 76px);
  font-weight: 850;
  letter-spacing: -0.045em;
  white-space: nowrap;
  line-height: 1.25;
}
.tool-strip h2 span {
  color: #d83e00;
}
.tool-strip nav {
  display: flex;
  align-items: center;
  align-self: stretch;
}
.tool-strip nav a {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 10px clamp(16px, 2.5vw, 36px);
  border-left: 1px solid #ffffff7a;
  font-weight: 600;
  font-size: clamp(12px, 1.5vw, 20px);
  white-space: nowrap;
}
.tool-strip nav a:after {
  content: "";
  position: absolute;
  left: clamp(16px, 2.5vw, 36px);
  bottom: 14%;
  width: 24px;
  height: 3px;
  background: #d83e00;
  transition: width 0.25s;
}
.tool-strip nav a:hover:after {
  width: calc(100% - 60px);
}
.tool-strip :focus-visible {
  outline-color: white;
}
.classroom {
  position: relative;
  isolation: isolate;
  min-height: 50vw;
  max-height: 780px;
  background: var(--paper) url("public/editorial/stopwatch-detail-1476.webp")
    center 5vw/100% auto no-repeat;
  overflow: hidden;
}
.classroom-copy {
  position: absolute;
  left: 3.9%;
  top: 9%;
  width: 24%;
  z-index: 2;
}
.classroom-copy h2 {
  font-size: clamp(28px, 4.05vw, 59px);
  font-weight: 850;
  line-height: 1.25;
  letter-spacing: -0.055em;
  border-top: 1px solid var(--blue);
  border-bottom: 1px solid var(--blue);
  padding: 19px 0;
  width: max-content;
}
.classroom-copy h2 span {
  color: #d83e00;
}
.class-name {
  font-size: clamp(17px, 1.95vw, 26px);
  font-weight: 750;
  color: var(--blue);
  margin-top: 14px;
}
.attendance {
  font-size: clamp(16px, 1.9vw, 26px);
  font-weight: 650;
  white-space: nowrap;
  margin-top: 8px;
}
.attendance strong {
  font-size: 1.45em;
  font-weight: 750;
}
.present {
  color: #118b60;
}
.absent {
  color: #c91b15;
}
.attendance > span {
  padding: 0 7px;
}
.submission {
  font-size: clamp(16px, 1.9vw, 26px);
  margin-top: 2px;
}
.classroom-note {
  font-size: clamp(10px, 1vw, 14px);
  margin-top: 23px;
  line-height: 1.65;
}
.classroom-desktop {
  position: absolute;
  width: 70%;
  left: 26%;
  top: 3.5%;
  border: 1px solid #cfd6df;
  border-radius: 5px;
  overflow: hidden;
  box-shadow: 0 7px 25px #1112100d;
}
.classroom-desktop img {
  width: 100%;
  height: auto;
}
.classroom-phone {
  position: absolute;
  top: 3%;
  right: 3.1%;
  width: 20.1%;
  border: 5px solid #e5e9ea;
  border-radius: 23px;
  background: #f5f9fc;
  overflow: hidden;
  box-shadow:
    0 0 0 1px #bbc4ca,
    0 10px 28px #1112101c;
}
.classroom-phone .image-open {
  overflow: hidden;
  border-radius: 16px;
}
.section-pad {
  padding: clamp(66px, 8.3vw, 130px) var(--gutter);
}
.section-heading {
  max-width: 800px;
  margin-bottom: 48px;
}
.section-label {
  font-size: 16px;
  font-weight: 650;
  color: var(--blue);
  margin-bottom: 17px;
}
.section-heading h2,
.closing h2 {
  font-size: clamp(38px, 5.6vw, 82px);
  font-weight: 800;
  letter-spacing: -0.065em;
  line-height: 1.16;
}
.section-heading > p:last-child {
  max-width: 560px;
  font-size: clamp(16px, 1.4vw, 20px);
  line-height: 1.7;
  margin-top: 24px;
  color: var(--muted);
}
.workday {
  background: #f4f0e8;
}
.experience-tabs {
  display: flex;
  border-bottom: 1px solid var(--blue);
  gap: clamp(10px, 4vw, 64px);
}
.experience-tabs button {
  padding: 16px 6px 22px;
  background: none;
  position: relative;
  font-size: clamp(18px, 2.6vw, 36px);
  font-weight: 750;
  line-height: 1.4;
  flex: 1;
  text-align: left;
  color: #656762;
  transition: color 0.2s;
}
.experience-tabs button > span {
  font-size: 14px;
  font-weight: 500;
  display: block;
  margin-bottom: 4px;
}
.experience-tabs button[aria-selected="true"] {
  color: var(--blue);
}
.experience-tabs button[aria-selected="true"]:after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--blue);
}
#experience-panel {
  padding-top: 28px;
}
.scene-copy {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  column-gap: 30px;
  align-items: start;
  margin: 0 0 28px;
}
.scene-copy h3 {
  font-size: clamp(21px, 2.25vw, 32px);
  font-weight: 750;
  letter-spacing: -0.025em;
}
.scene-copy > p {
  max-width: 560px;
  font-size: 16px;
  color: var(--muted);
  line-height: 1.8;
}
.scene-location {
  font-size: 12px;
  color: var(--blue);
  grid-column: 1;
  margin-top: 7px;
}
.product-frame {
  position: relative;
}
.product-frame > .image-open {
  border: 1px solid #ced6df;
  box-shadow: 0 15px 45px #1112100b;
  overflow: hidden;
  border-radius: 5px;
}
.product-frame img {
  width: 100%;
  background: #e9eef8;
  aspect-ratio: 8/5;
}
.product-frame figcaption {
  font-size: 12px;
  color: var(--muted);
  margin-top: 14px;
}
.zoom-hint {
  position: absolute;
  bottom: 14px;
  right: 14px;
  background: #fff;
  box-shadow: 0 1px 8px #11121022;
  border: 1px solid #ccd3dd;
  padding: 7px 12px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 600;
}
.scene-changing .product-frame img {
  animation: scene-in 0.32s var(--ease);
}
@keyframes scene-in {
  from {
    opacity: 0.4;
    transform: translateY(5px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}
.image-loading {
  position: absolute;
  z-index: 2;
  left: 18px;
  top: 18px;
  background: white;
  padding: 9px 15px;
  border: 1px solid var(--blue);
  max-width: calc(100% - 36px);
}
[hidden] {
  display: none !important;
}
.workspace-index {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 35px;
  padding-top: 64px;
}
.workspace-index h3 {
  font-size: clamp(25px, 3vw, 40px);
  letter-spacing: -0.045em;
  line-height: 1.35;
}
.workspace-index ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: 40px;
}
.workspace-index li {
  padding: 9px 0;
  font-size: 17px;
  border-bottom: 1px solid var(--line);
}
.workspace-index p {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.8;
  margin-top: 22px;
  max-width: 540px;
}
.connection {
  background: #e9ece5;
}
.connection-visual {
  position: relative;
  max-width: 1200px;
  margin: auto;
  padding-bottom: 30px;
}
.desktop-mini {
  width: 86%;
  border: 1px solid #c8cfd6;
  box-shadow: 0 12px 35px #1112100c;
  border-radius: 5px;
  overflow: hidden;
}
.phone {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 20%;
  border: 5px solid #e4e9ea;
  background: white;
  border-radius: 23px;
  overflow: hidden;
  box-shadow:
    0 0 0 1px #b5bfc7,
    0 15px 28px #1112101c;
}
.phone img {
  width: 100%;
}
.connection-caption {
  font-size: 13px;
  max-width: 720px;
  color: var(--muted);
  line-height: 1.8;
  margin-top: 24px;
}
.flow {
  list-style: none;
  padding: 0;
  margin: 55px 0 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 34px;
}
.flow > li {
  border-top: 1px solid #8c9795;
  padding-top: 19px;
}
.flow > li > span {
  color: var(--blue);
  font-size: 14px;
  font-weight: 650;
}
.flow h3 {
  font-size: clamp(21px, 2.2vw, 30px);
  margin-top: 18px;
  letter-spacing: -0.04em;
}
.flow p {
  color: var(--muted);
  font-size: 15px;
  max-width: 300px;
  line-height: 1.8;
  margin-top: 11px;
}
.data-note {
  border-top: 1px solid #b4bbb0;
  margin-top: 56px;
  padding-top: 23px;
  display: flex;
  align-items: start;
  gap: 45px;
  justify-content: space-between;
}
.data-note p {
  font-size: 14px;
  line-height: 1.8;
  max-width: 680px;
}
.data-note a {
  white-space: nowrap;
  font-size: 14px;
}
/* 真实能力统计带 */
.stats-band {
  padding: clamp(40px, 5.5vw, 84px) var(--gutter);
  border-top: 1px solid var(--line);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(28px, 4vw, 64px);
  max-width: 1180px;
  margin: 0 auto;
}
.stat dt {
  color: var(--blue);
  font-weight: 600;
  font-size: 15px;
  margin-bottom: 6px;
}
.stat dd {
  margin: 0;
  font-family: "Xiangshao Display", "PingFang SC", sans-serif;
  font-weight: 900;
  font-size: clamp(56px, 6.5vw, 92px);
  line-height: 1;
  color: var(--orange);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.stat .stat-plus {
  color: var(--blue);
  font-size: 0.55em;
  margin-left: 2px;
}
.stat .stat-sub {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-weight: 400;
  letter-spacing: 0;
}
@media (max-width: 720px) {
  .stats-grid { grid-template-columns: 1fr; gap: 30px; }
  .stat dd { font-size: 56px; }
}

.platforms {
  background: var(--blue) url("public/editorial/court-blue-1440.webp")
    center/cover;
  color: white;
}
.platforms .section-label,
.platforms .section-heading > p:last-child {
  color: white;
}
.platform-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8vw;
}
.platform-group > p {
  font-size: 15px;
  margin-bottom: 10px;
}
.platform-group > a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 22px 0;
  border-bottom: 1px solid #ffffff65;
  transition: padding 0.25s;
}
.platform-group > a:hover {
  padding-left: 10px;
}
.platform-group h3 {
  font-size: clamp(29px, 3.4vw, 48px);
  letter-spacing: -0.035em;
  line-height: 1.2;
  font-weight: 650;
}
.platform-group a > span {
  font-size: 13px;
  white-space: nowrap;
}
.scope-note {
  font-size: 13px;
  line-height: 1.8;
  margin-top: 40px;
  max-width: 760px;
}
.platforms :focus-visible,
.closing :focus-visible {
  outline-color: white;
}
.faq {
  display: grid;
  grid-template-columns: 0.85fr 1fr;
  gap: 8vw;
}
.faq .section-heading {
  margin: 0;
}
.faq .section-heading > .text-link {
  margin-top: 32px;
  font-size: 14px;
}
.faq-list > details {
  border-top: 1px solid var(--line);
  padding: 21px 0;
}
.faq-list > details:last-child {
  border-bottom: 1px solid var(--line);
}
summary {
  cursor: pointer;
  list-style-position: outside;
  font-weight: 650;
}
summary:hover {
  color: var(--blue);
}
.faq summary {
  font-size: 18px;
  padding-right: 10px;
}
.faq details > p {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.85;
  margin-top: 16px;
}
.faq details > a {
  display: inline-block;
  font-size: 14px;
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 4px;
  margin-top: 15px;
}
.closing {
  background: var(--blue) url("public/editorial/court-blue-1440.webp")
    center/cover;
  color: white;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 32px;
}
.closing h2 span {
  color: #d83e00;
}
.closing p {
  font-size: 17px;
  margin-top: 24px;
}
.closing .button {
  margin-bottom: 6px;
}
.site-footer {
  padding: 45px var(--gutter) 27px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 20px;
}
.site-footer .brand img {
  width: 125px;
}
.site-footer > p {
  font-size: 13px;
}
.site-footer > div {
  display: flex;
  gap: 30px;
  font-size: 13px;
}
.site-footer a:hover {
  color: var(--blue);
}
.site-footer small {
  grid-column: 1/-1;
  font-size: 11px;
  color: var(--muted);
  margin-top: 16px;
}
.image-dialog {
  border: 0;
  background: var(--paper);
  padding: 20px;
  width: calc(100vw - 50px);
  max-width: 1500px;
  max-height: calc(100dvh - 50px);
  border-radius: 8px;
  color: var(--ink);
}
.image-dialog::backdrop {
  background: #111a2aaf;
}
.dialog-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.dialog-toolbar > p {
  font-weight: 700;
}
.dialog-close {
  min-height: 44px;
  min-width: 64px;
  border: 1px solid var(--blue);
  color: var(--blue);
  background: var(--paper);
  padding: 5px 14px;
}
.dialog-image-wrap {
  overflow: auto;
  max-height: calc(100dvh - 225px);
  margin-top: 16px;
  background: #fff;
}
.dialog-image-wrap img {
  max-width: none;
  width: max(100%, 1100px);
  height: auto;
}
.dialog-image-wrap.is-phone img {
  width: min(100%, 390px);
  min-width: 280px;
  margin: auto;
}
.image-instruction,
.dialog-caption {
  font-size: 12px;
  color: var(--muted);
  margin-top: 14px;
}
.dialog-status {
  font-size: 14px;
  color: var(--blue);
  margin-top: 10px;
}
.modal-open {
  overflow: hidden;
}
.noscript {
  padding: 20px;
  font-size: 14px;
}
.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 0.65s var(--ease),
    transform 0.65s var(--ease);
}
.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}
.subpage {
  max-width: 1600px;
  margin: auto;
  padding: 40px var(--gutter) 100px;
}
.breadcrumb {
  display: flex;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 52px;
}
.breadcrumb > a {
  color: var(--blue);
}
.subpage h1 {
  font-size: clamp(43px, 6.1vw, 92px);
  letter-spacing: -0.065em;
  line-height: 1.2;
  font-weight: 800;
}
.subpage-intro {
  font-size: clamp(16px, 1.55vw, 22px);
  max-width: 730px;
  margin: 28px 0 55px;
  color: var(--muted);
}
.release-note {
  border-top: 2px solid var(--blue);
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 35px;
  padding: 26px 0;
}
.release-note strong {
  color: var(--blue);
  font-size: 23px;
}
.release-note p {
  font-size: 15px;
  max-width: 620px;
  color: var(--muted);
  line-height: 1.8;
}
.download-group {
  margin-top: 58px;
}
.download-group > h2 {
  font-size: 28px;
  letter-spacing: -0.04em;
  font-weight: 750;
  margin-bottom: 24px;
}
.download-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.download-list.mobile {
  grid-template-columns: repeat(3, 1fr);
}
.download-card {
  border-top: 1px solid var(--blue);
  padding-top: 24px;
  scroll-margin-top: 35px;
}
.download-card:target {
  outline: 3px solid var(--orange);
  outline-offset: 14px;
}
.download-card > h3 {
  font-size: clamp(30px, 3.7vw, 48px);
  letter-spacing: -0.05em;
  line-height: 1.3;
}
.state {
  display: block;
  font-size: 13px;
  color: var(--blue);
  font-weight: 650;
  margin-top: 11px;
}
.download-card > p {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.85;
  margin: 23px 0;
}
.download-card details {
  font-size: 14px;
}
.download-card summary {
  min-height: 44px;
}
.download-card ul {
  padding-left: 18px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.9;
  margin-top: 8px;
}
.download-card li {
  padding-bottom: 7px;
}
.download-notes {
  margin: 40px 0 8px;
  padding: 22px 26px;
  background: #fdf3ec;
  border: 1px solid var(--orange);
  border-radius: 10px;
}
.download-notes h2 {
  margin: 0 0 8px;
  font-size: 20px;
}
.download-notes p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 14px;
}
.install-notes-list {
  margin: 0;
  padding-left: 1.2em;
  font-size: 14px;
  line-height: 1.75;
}
.install-notes-list strong {
  color: var(--ink);
}
.download-footer {
  display: flex;
  justify-content: space-between;
  gap: 50px;
  border-top: 1px solid var(--line);
  margin-top: 60px;
  padding-top: 26px;
}
.download-footer p {
  font-size: 14px;
  color: var(--muted);
  max-width: 700px;
  line-height: 1.8;
}
.download-footer a {
  white-space: nowrap;
  font-size: 14px;
}
.help-layout {
  display: grid;
  grid-template-columns: 230px 1fr;
  gap: 8vw;
}
.help-nav {
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 35px;
  align-self: start;
}
.help-nav > a {
  padding: 12px 0;
  color: var(--blue);
  font-size: 14px;
  border-bottom: 1px solid var(--line);
}
.help-content {
  max-width: 830px;
}
.help-content > section {
  padding: 0 0 45px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 35px;
}
.help-content h2 {
  font-size: clamp(25px, 3.4vw, 43px);
  line-height: 1.3;
  letter-spacing: -0.05em;
}
.help-content p,
.help-content ol {
  font-size: 16px;
  line-height: 1.95;
  color: var(--muted);
  margin-top: 25px;
}
.help-content a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 4px;
}
.help-content ol {
  padding-left: 24px;
}
.help-content li {
  padding-bottom: 15px;
}
.help-content .text-link {
  font-size: 14px;
  margin-top: 20px;
}
@media (max-width: 1000px) and (min-width: 641px) {
  .site-header nav {
    gap: 5vw;
  }
  .tool-strip h2 {
    font-size: 4.6vw;
  }
  .tool-strip nav a {
    padding: 10px 17px;
  }
  .tool-strip nav a:after {
    left: 17px;
  }
  .classroom-note {
    margin-top: 15px;
  }
  .classroom-copy h2 {
    padding: 14px 0;
  }
  .scene-copy {
    grid-template-columns: 1fr 1fr;
  }
  .faq {
    grid-template-columns: 0.8fr 1fr;
    gap: 5vw;
  }
  .download-list.mobile {
    grid-template-columns: 1fr 1fr;
  }
  .help-layout {
    grid-template-columns: 180px 1fr;
    gap: 5vw;
  }
}
@media (max-width: 640px) {
  :root {
    --gutter: 24px;
  }
  html {
    scroll-padding-top: 25px;
  }
  .site-header {
    height: 68px;
    padding: 0 22px;
  }
  .brand img {
    width: 118px;
  }
  .menu-toggle {
    display: block;
    border: 1px solid var(--blue);
    color: var(--blue);
    font-size: 13px;
    min-height: 40px;
    padding: 6px 13px;
  }
  .site-header nav {
    display: none;
    position: absolute;
    top: 67px;
    left: 0;
    right: 0;
    padding: 20px 24px;
    background: var(--paper);
    border-bottom: 1px solid var(--blue);
    gap: 0;
    box-shadow: 0 14px 28px #11121014;
  }
  .site-header nav.is-open {
    display: flex;
    flex-direction: column;
    align-items: stretch;
  }
  .site-header nav a {
    padding: 14px 0;
    font-size: 16px;
  }
  .site-header nav .nav-cta {
    border-radius: 0;
    padding: 12px 17px;
    margin-top: 9px;
    text-align: center;
  }
  .tool-strip {
    display: block;
    padding: 25px 24px 20px;
    min-height: 0;
    background-image: url("public/editorial/court-blue-1024.webp");
  }
  .tool-strip h2 {
    font-size: 30px;
    white-space: normal;
    letter-spacing: -0.05em;
    line-height: 1.2;
  }
  .tool-strip nav {
    margin-top: 22px;
    justify-content: space-between;
  }
  .tool-strip nav a {
    font-size: 12px;
    padding: 6px 16px 14px;
    min-height: 40px;
  }
  .tool-strip nav a:first-child {
    border-left: 0;
    padding-left: 0;
  }
  .tool-strip nav a:after {
    left: 16px;
    bottom: 4px;
    width: 18px;
    height: 2px;
  }
  .tool-strip nav a:first-child:after {
    left: 0;
  }
  .classroom {
    min-height: 750px;
    max-height: none;
    background-size: auto 510px;
    background-position: left bottom;
  }
  .classroom-copy {
    left: 24px;
    top: 32px;
    width: calc(100% - 48px);
    position: relative;
  }
  .classroom-copy h2 {
    font-size: 39px;
    padding: 14px 0;
    line-height: 1.2;
  }
  .class-name {
    font-size: 18px;
    margin-top: 17px;
  }
  .attendance {
    font-size: 17px;
  }
  .submission {
    font-size: 16px;
  }
  .classroom-note {
    font-size: 11px;
    margin-top: 17px;
    max-width: 165px;
    line-height: 1.75;
  }
  .classroom-desktop {
    left: 24px;
    top: 344px;
    width: 115%;
    box-shadow: 0 5px 18px #1112100d;
  }
  .classroom-phone {
    right: 23px;
    top: 168px;
    width: 43%;
    border-radius: 19px;
    border-width: 4px;
  }
  .classroom-phone .image-open {
    border-radius: 12px;
  }
  .section-pad {
    padding: 68px 24px;
  }
  .section-heading {
    margin-bottom: 32px;
  }
  .section-heading h2,
  .closing h2 {
    font-size: 43px;
    line-height: 1.18;
  }
  .section-label {
    font-size: 13px;
    margin-bottom: 16px;
  }
  .section-heading > p:last-child {
    font-size: 15px;
    margin-top: 21px;
  }
  .experience-tabs {
    gap: 14px;
  }
  .experience-tabs button {
    font-size: 22px;
    padding: 12px 0 18px;
  }
  .experience-tabs button > span {
    font-size: 12px;
  }
  .scene-copy {
    display: block;
  }
  .scene-copy h3 {
    font-size: 24px;
    line-height: 1.4;
  }
  .scene-copy > p {
    font-size: 14px;
    line-height: 1.8;
    margin-top: 13px;
  }
  .scene-location {
    display: block;
    font-size: 11px;
    margin-top: 14px;
  }
  .product-frame figcaption {
    font-size: 11px;
    line-height: 1.65;
  }
  .zoom-hint {
    bottom: 8px;
    right: 8px;
    font-size: 10px;
    padding: 4px 7px;
  }
  .workspace-index {
    display: block;
    padding-top: 45px;
  }
  .workspace-index h3 {
    font-size: 29px;
  }
  .workspace-index > div {
    margin-top: 25px;
  }
  .workspace-index ul {
    column-gap: 24px;
  }
  .workspace-index li {
    font-size: 14px;
  }
  .workspace-index p {
    font-size: 12px;
  }
  .desktop-mini {
    width: 95%;
  }
  .connection-visual {
    padding-bottom: 155px;
  }
  .phone {
    width: 36%;
    bottom: 0;
    border-radius: 18px;
    border-width: 4px;
  }
  .connection-caption {
    font-size: 12px;
    margin-top: 25px;
  }
  .flow {
    display: block;
    margin-top: 37px;
  }
  .flow > li {
    padding: 20px 0;
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 6px 16px;
  }
  .flow > li > span {
    font-size: 12px;
    padding-top: 3px;
  }
  .flow h3 {
    font-size: 22px;
    margin-top: 0;
  }
  .flow p {
    grid-column: 2;
    font-size: 14px;
    margin-top: 5px;
  }
  .data-note {
    display: block;
    margin-top: 27px;
    padding-top: 22px;
  }
  .data-note p {
    font-size: 13px;
  }
  .data-note a {
    font-size: 13px;
    margin-top: 15px;
  }
  .platforms,
  .closing {
    background-image: url("public/editorial/court-blue-1024.webp");
  }
  .platform-grid {
    display: block;
  }
  .platform-group + .platform-group {
    margin-top: 35px;
  }
  .platform-group > p {
    font-size: 13px;
  }
  .platform-group > a {
    padding: 18px 0;
  }
  .platform-group h3 {
    font-size: 33px;
  }
  .platform-group a > span {
    font-size: 11px;
  }
  .scope-note {
    font-size: 12px;
    margin-top: 27px;
  }
  .faq {
    display: block;
  }
  .faq .section-heading {
    margin-bottom: 35px;
  }
  .faq .section-heading > .text-link {
    margin-top: 21px;
  }
  .faq summary {
    font-size: 16px;
  }
  .faq details > p {
    font-size: 14px;
  }
  .closing {
    display: block;
  }
  .closing .button {
    margin-top: 30px;
  }
  .closing p {
    font-size: 15px;
    max-width: 300px;
  }
  .site-footer {
    display: flex;
    flex-wrap: wrap;
    padding: 33px 24px 24px;
    gap: 15px 24px;
  }
  .site-footer .brand img {
    width: 109px;
  }
  .site-footer > p {
    font-size: 11px;
  }
  .site-footer > div {
    width: 100%;
    gap: 27px;
    font-size: 12px;
    margin-top: 10px;
  }
  .site-footer small {
    width: 100%;
    font-size: 10px;
    line-height: 1.7;
    margin-top: 3px;
  }
  .image-dialog {
    width: calc(100vw - 24px);
    padding: 14px;
    max-height: calc(100dvh - 24px);
  }
  .dialog-toolbar > p {
    font-size: 14px;
  }
  .dialog-image-wrap {
    max-height: calc(100dvh - 222px);
  }
  .dialog-image-wrap.is-phone img {
    width: 100%;
    min-width: 0;
  }
  .subpage {
    padding: 27px 24px 65px;
  }
  .breadcrumb {
    margin-bottom: 35px;
    font-size: 12px;
  }
  .subpage h1 {
    font-size: 47px;
  }
  .subpage-intro {
    font-size: 15px;
    margin: 23px 0 35px;
  }
  .release-note {
    display: block;
    padding: 23px 0;
  }
  .release-note strong {
    font-size: 21px;
  }
  .release-note p {
    font-size: 14px;
    margin-top: 14px;
  }
  .download-group {
    margin-top: 43px;
  }
  .download-group > h2 {
    font-size: 24px;
    margin-bottom: 27px;
  }
  .download-list,
  .download-list.mobile {
    display: block;
  }
  .download-card {
    padding-top: 21px;
    margin-top: 35px;
    scroll-margin-top: 28px;
  }
  .download-card > h3 {
    font-size: 39px;
  }
  .download-card > p {
    font-size: 14px;
    margin: 19px 0;
  }
  .download-card:target {
    outline-offset: 8px;
  }
  .download-footer {
    display: block;
    margin-top: 45px;
    gap: 0;
  }
  .download-footer p {
    font-size: 13px;
  }
  .download-footer a {
    font-size: 13px;
    margin-top: 18px;
  }
  .help-layout {
    display: block;
  }
  .help-nav {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 20px;
    margin-bottom: 35px;
  }
  .help-nav > a {
    font-size: 13px;
    min-height: 45px;
  }
  .help-content h2 {
    font-size: 29px;
  }
  .help-content > section {
    padding-bottom: 32px;
    margin-bottom: 35px;
  }
  .help-content p,
  .help-content ol {
    font-size: 14px;
    margin-top: 19px;
    line-height: 1.9;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *:before,
  *:after {
    animation: none !important;
    transition: none !important;
  }
  .js .reveal {
    opacity: 1;
    transform: none;
  }
  .primary:hover {
    transform: none;
  }
}
@media print {
  .site-header,
  .image-dialog,
  .menu-toggle,
  .image-open .zoom-hint {
    display: none;
  }
  .js .reveal {
    opacity: 1;
    transform: none;
  }
  .section-pad {
    padding: 30px;
  }
  .classroom {
    min-height: 50vw;
  }
  .site-footer {
    padding: 20px;
  }
}

.hero h1,
.tool-strip h2,
.classroom-copy h2,
.section-heading h2,
.closing h2,
.subpage h1,
.help-content h2 {
  font-family:
    "Xiangshao Display", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 900;
  font-synthesis: none;
}
@media (min-width: 641px) and (max-width: 900px) {
  .classroom-note {
    background: var(--paper);
    position: relative;
    padding: 3px 0;
    box-shadow:
      5px 0 0 var(--paper),
      -5px 0 0 var(--paper);
  }
}

.button:after,
.text-link:after,
.nav-cta:after {
  content: "";
  display: inline-block;
  width: 17px;
  height: 17px;
  flex: 0 0 17px;
  background: currentColor;
  mask: url("public/icons/arrow-right.svg") center/contain no-repeat;
  -webkit-mask: url("public/icons/arrow-right.svg") center/contain no-repeat;
  margin-left: 11px;
  transition: transform 0.2s;
}
.button:hover:after,
.text-link:hover:after,
.nav-cta:hover:after {
  transform: translateX(3px);
}
.site-header .nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
/* Mobile keeps the whole equipment arrangement and the entire product frame in view. */
@media (max-width: 640px) {
  .classroom-note {
    background: var(--paper);
    padding: 3px 0;
    position: relative;
    box-shadow:
      5px 0 0 var(--paper),
      -5px 0 0 var(--paper);
  }
}
@media (min-width: 641px) {
  .classroom-note {
    background: var(--paper);
    padding: 3px 0;
    position: relative;
    box-shadow:
      5px 0 0 var(--paper),
      -5px 0 0 var(--paper);
  }
}

.image-error {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
  color: var(--blue);
  font-size: 14px;
  background: #edf1f7;
  position: absolute;
  inset: 0;
  min-height: 80px;
}
.dialog-retry {
  background: var(--blue);
  color: white;
  min-height: 44px;
  padding: 8px 16px;
  margin-top: 12px;
}
.has-image-error {
  min-height: 80px;
}

@media (max-width: 640px) {
  .classroom {
    background-image: url("public/editorial/stopwatch-detail-768.webp");
  }
}
@media (min-width: 641px) and (max-width: 1000px) {
  .classroom {
    background-image: url("public/editorial/stopwatch-detail-1100.webp");
  }
}
/* Rectangular clipping removes the source logo's edge lines before compositing. */
.brand {
  overflow: hidden;
}
.brand img {
  clip-path: none;
  margin-block: -2px;
}
@media (max-width: 640px) {
  .workday .section-heading h2 {
    font-size: clamp(30px, 9.7vw, 38px);
  }
}
/* A delayed scene must not show the previous task under the new caption. */
#experience-panel.is-loading #scene-image {
  visibility: hidden;
}

/* 微信内打开引导条（仅在微信 UA 下出现） */
.wx-guide {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  padding: 10px 20px;
  background: #0f3d6e;
  color: #fff;
  font-size: 14px;
  line-height: 1.5;
  box-shadow: 0 6px 24px #11121033;
}
.wx-guide b { color: #ffd9c4; }
.wx-guide button {
  border: 1.5px solid #fff;
  background: transparent;
  color: #fff;
  border-radius: 999px;
  padding: 4px 16px;
  font-size: 13px;
  font-weight: 600;
}
.wx-guide button:hover { background: #ffffff22; }
.wx-guide button:focus-visible { outline: 3px solid var(--orange); outline-offset: 2px; }

/* 下载页线上版本徽章 */
.live-version {
  margin: 10px 0 0;
  display: inline-block;
  padding: 4px 14px;
  border-radius: 999px;
  background: #e8f1ff;
  border: 1px solid var(--blue);
  color: var(--blue);
  font-size: 13px;
  font-weight: 600;
}

/* tool-strip 粉笔线：随滚动画出（一次） */
.tool-strip { position: relative; }
.chalk-line {
  position: absolute;
  left: 4%;
  right: 4%;
  bottom: 12px;
  width: 92%;
  height: 26px;
  pointer-events: none;
}
.chalk-line path {
  stroke: #ffffff;
  stroke-width: 2.4;
  stroke-linecap: round;
  stroke-dasharray: 7 9;
  opacity: 0.85;
  stroke-dashoffset: 0;
}
html.js .chalk-line path {
  stroke-dasharray: 2400;
  stroke-dashoffset: 2400;
  transition: stroke-dashoffset 1.6s var(--ease) 0.15s;
}
html.js .chalk-line.is-drawn path { stroke-dashoffset: 0; }
@media (prefers-reduced-motion: reduce) {
  html.js .chalk-line path {
    stroke-dasharray: 7 9;
    stroke-dashoffset: 0;
    transition: none;
  }
}

/* 下载页二维码卡 */
.qr-card {
  margin: 44px auto 8px;
  max-width: 560px;
  padding: 26px 30px;
  background: var(--white);
  border: 1.5px solid var(--blue);
  border-radius: 14px;
  text-align: center;
}
.qr-card h2 {
  margin: 0 0 14px;
  font-family: "Xiangshao Display", "PingFang SC", sans-serif;
  font-weight: 900;
  font-size: 24px;
  color: var(--ink);
}
.qr-frame {
  width: 176px;
  height: 176px;
  margin: 0 auto 12px;
  padding: 10px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
}
.qr-frame svg { width: 100%; height: 100%; display: block; }
.qr-frame a { color: var(--blue); font-weight: 650; }
.qr-card p { margin: 0; color: var(--muted); font-size: 13.5px; line-height: 1.6; }

/* 品牌选中色 */
::selection { background: var(--orange); color: #fff; }
/* 收尾区动作并排 */
.closing-actions { display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }