/* 标签在 DOM 中先于内容，保证按 Tab 可以继续阅读当前演示。 */
.hero-art {
  display: flex;
  flex-direction: column;
}
.product-window {
  order: 1;
}
.connection-card {
  order: 2;
}
.demo-controls {
  order: 3;
}
.demo-caption {
  order: 4;
}
.language-control,
.source-button {
  display: none;
}
.js .language-control {
  display: flex;
}
.js .source-button {
  display: inline-flex;
}

/* 根据内容宽度调整，而不是绑定某个设备型号。 */
@media (min-width: 1450px) {
  .hero {
    column-gap: 76px;
  }
}
@media (max-width: 1190px) {
  .container {
    width: calc(100% - 72px);
  }
  .header-inner {
    gap: 22px;
  }
  .nav-links {
    gap: 21px;
    font-size: 12px;
  }
  .header-actions {
    gap: 16px;
  }
  .hero {
    column-gap: 32px;
    padding-top: 75px;
  }
  h1 {
    font-size: 56px;
  }
  .hero-description {
    font-size: 14px;
  }
  .product-interior {
    grid-template-columns: 99px minmax(0, 1fr);
  }
  .product-sidebar {
    padding-inline: 8px;
  }
  .demo-panel {
    padding-inline: 20px;
  }
  .demo-heading {
    font-size: 15px;
  }
  .hero-bottom {
    margin-top: 40px;
  }
  .intro-section {
    gap: 27px;
    grid-template-columns: 65px 1.35fr 1fr;
  }
  .intro-doodle {
    width: 63px;
  }
  .intro-description {
    font-size: 12px;
  }
  .feature-content {
    padding-inline: 21px;
  }
  .features-grid {
    gap: 18px;
  }
  .feature-card h3 {
    font-size: 19px;
  }
  .spaces-heading {
    gap: 40px;
  }
  .space-card {
    padding-inline: 28px;
  }
  .space-card h3 {
    font-size: 23px;
  }
  .closing-inner {
    padding-inline: 44px;
  }
  .closing-copy {
    max-width: 560px;
  }
  .closing-art {
    width: 310px;
    height: 310px;
    top: calc(50% - 155px);
    right: 5px;
  }
  .closing-description {
    max-width: 400px;
  }
}
@media (max-width: 960px) {
  .container {
    width: calc(100% - 56px);
  }
  .brand {
    font-size: 21px;
    gap: 8px;
  }
  .brand-symbol {
    width: 23px;
    height: 28px;
  }
  .header-inner {
    height: 83px;
    gap: 15px;
  }
  .nav-links {
    gap: 17px;
    font-size: 11px;
  }
  .header-actions {
    gap: 12px;
  }
  .header-cta {
    padding-inline: 11px;
    font-size: 10px;
    gap: 5px;
  }
  .language-control select {
    font-size: 10px;
  }
  .language-control > .icon:first-child {
    display: none;
  }
  .hero {
    column-gap: 27px;
    grid-template-columns: 0.85fr 1.15fr;
    padding-top: 58px;
  }
  h1 {
    font-size: 45px;
  }
  .hero-description {
    font-size: 12px;
  }
  .hero-eyebrow {
    font-size: 8px;
    margin-bottom: 22px;
  }
  .hero-note {
    font-size: 8px;
    gap: 6px;
    margin-top: 26px;
  }
  .hero .button {
    font-size: 11px;
    padding: 12px 15px;
    gap: 8px;
    min-height: 46px;
  }
  .hero-secondary {
    font-size: 10px;
  }
  .product-interior {
    grid-template-columns: 79px minmax(0, 1fr);
  }
  .product-sidebar > small {
    display: none;
  }
  .sidebar-item {
    font-size: 7px;
    gap: 5px;
    padding: 6px 3px;
  }
  .sidebar-item .icon {
    flex-basis: 10px;
    width: 10px;
  }
  .product-sidebar > strong {
    font-size: 9px;
  }
  .demo-panel {
    padding-inline: 17px;
    min-height: 393px;
  }
  .demo-panel p {
    font-size: 9px;
  }
  .demo-heading {
    font-size: 14px;
  }
  .demo-panel blockquote {
    font-size: 10px;
  }
  .connection-card {
    margin-left: -15px;
    width: 96%;
    padding: 12px;
  }
  .connection-card strong {
    font-size: 9px;
  }
  .connection-card small {
    font-size: 7px;
  }
  .connection-card .mini-constellation {
    width: 32px;
    flex-basis: 32px;
  }
  .connection-card .mini-constellation::before,
  .connection-card .mini-constellation::after {
    width: 25px;
  }
  .demo-tab {
    font-size: 9px;
    padding: 8px 9px;
  }
  .art-flower {
    width: 62px;
    height: 62px;
    right: -8px;
    top: -15px;
  }
  .intro-section {
    padding-block: 76px;
    grid-template-columns: 60px 1.15fr 1fr;
    gap: 21px;
  }
  .intro-section .section-title {
    font-size: 25px;
  }
  .intro-description {
    font-size: 11px;
  }
  .features-section {
    padding-block: 64px;
  }
  .section-heading {
    align-items: start;
  }
  .section-heading > p {
    max-width: 190px;
    margin-top: 35px;
    font-size: 11px;
  }
  .feature-visual {
    height: 180px;
    flex-basis: 180px;
  }
  .small-note {
    width: 70%;
    left: 14%;
    top: 27px;
    height: 138px;
    padding: 14px;
  }
  .small-note > strong {
    font-size: 9px;
  }
  .floating-pen {
    right: 8%;
    top: 22px;
    width: 21px;
    height: 95px;
  }
  .small-note-date {
    font-size: 6px;
  }
  .note-sticker {
    padding: 6px 12px;
  }
  .feature-ask .feature-visual {
    padding: 25px 12px;
  }
  .mini-question {
    font-size: 8px;
    padding: 10px;
    gap: 4px;
  }
  .mini-answer {
    gap: 7px;
    padding: 11px 10px;
  }
  .mini-answer strong {
    font-size: 8px;
  }
  .topic-chip {
    font-size: 9px;
    padding: 8px 10px;
    gap: 4px;
  }
  .chip-one {
    top: 18px;
    left: 9%;
  }
  .chip-two {
    right: 7%;
    top: 32px;
  }
  .chip-three {
    right: 5%;
    bottom: 22px;
  }
  .topic-mini {
    left: 8%;
    bottom: 19px;
    width: 53px;
    padding: 8px;
  }
  .feature-content {
    padding: 24px 18px;
  }
  .feature-card h3 {
    font-size: 17px;
  }
  .feature-card p {
    font-size: 11px;
  }
  .feature-tag {
    font-size: 9px;
  }
  .spaces-section {
    padding-top: 77px;
    padding-bottom: 65px;
  }
  .spaces-heading > p {
    max-width: 280px;
    font-size: 12px;
  }
  .spaces-heading {
    gap: 30px;
  }
  .space-card {
    padding: 25px 25px 0;
  }
  .space-card h3 {
    font-size: 21px;
  }
  .space-card-top {
    margin-bottom: 22px;
  }
  .space-card li {
    font-size: 10px;
  }
  .personal-sprout {
    width: 56px;
  }
  .space-footer strong {
    font-size: 10px;
  }
  .space-footer small {
    font-size: 8px;
  }
  .team-avatars span {
    width: 29px;
    height: 29px;
  }
  .closing-inner {
    padding: 44px 35px;
  }
  .closing-copy {
    max-width: 465px;
  }
  .closing-section h2 {
    font-size: 35px;
  }
  .closing-description {
    max-width: 330px;
  }
  .closing-art {
    width: 250px;
    height: 250px;
    top: 39px;
    right: 0;
  }
  .closing-status {
    display: flex;
    width: fit-content;
    margin-left: 0;
    margin-top: 16px;
  }
  .closing-section {
    padding-bottom: 65px;
  }
}
@media (max-width: 760px) {
  html {
    scroll-padding-top: 24px;
  }
  .container {
    width: calc(100% - 40px);
  }
  .header-inner {
    height: auto;
    min-height: 77px;
    flex-wrap: wrap;
    gap: 0;
    padding-block: 16px;
  }
  .header-actions {
    margin-left: auto;
    gap: 11px;
  }
  .header-cta {
    display: none;
  }
  .language-control select {
    font-size: 11px;
    padding-right: 16px;
  }
  .menu-toggle {
    display: none;
    width: 39px;
    height: 39px;
  }
  .js .menu-toggle {
    display: inline-flex;
  }
  .nav-links {
    width: 100%;
    order: 3;
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    margin-top: 13px;
    padding-top: 5px;
    border-top: 1px solid var(--line);
    font-size: 12px;
  }
  .js .nav-links:not(.is-open) {
    display: none;
  }
  .hero {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding-top: 48px;
    align-items: stretch;
  }
  .hero-copy {
    max-width: 560px;
    text-align: center;
    margin-inline: auto;
    padding-bottom: 0;
  }
  .hero-eyebrow {
    justify-content: center;
    margin-bottom: 21px;
    font-size: 9px;
  }
  h1 {
    font-size: clamp(48px, 8.5vw, 65px);
    line-height: 1.3;
    margin-bottom: 23px;
  }
  .hero-description {
    max-width: 415px;
    margin-inline: auto;
    font-size: 13px;
    line-height: 1.95;
    margin-bottom: 24px;
  }
  .hero .button {
    padding: 13px 19px;
    font-size: 12px;
    min-height: 49px;
    gap: 14px;
  }
  .hero-secondary {
    margin-inline: auto;
    font-size: 11px;
    margin-top: 17px;
  }
  .hero-note {
    justify-content: center;
    margin-top: 22px;
    font-size: 9px;
  }
  .hero-art {
    margin: 44px auto 0;
    width: min(560px, calc(100% - 10px));
    padding-top: 14px;
  }
  .art-grid {
    inset: -14px -10px 25px;
  }
  .product-interior {
    grid-template-columns: 106px minmax(0, 1fr);
    min-height: 365px;
  }
  .product-sidebar {
    padding: 27px 10px 15px;
  }
  .product-sidebar > small {
    display: block;
    font-size: 6px;
  }
  .sidebar-item {
    font-size: 8px;
    padding: 7px 5px;
    gap: 7px;
  }
  .sidebar-item .icon {
    width: 12px;
    flex-basis: 12px;
  }
  .demo-panel {
    min-height: 365px;
    padding: 23px 23px 32px;
  }
  .demo-heading {
    font-size: 16px;
  }
  .demo-panel p {
    font-size: 10px;
  }
  .connection-card {
    width: 87%;
    margin-left: -5px;
    padding: 13px;
  }
  .connection-card strong {
    font-size: 10px;
  }
  .connection-card small {
    font-size: 8px;
  }
  .art-flower {
    top: -13px;
    right: -5px;
    width: 61px;
    height: 61px;
  }
  .demo-controls {
    margin-top: 22px;
  }
  .demo-tab {
    font-size: 11px;
    padding: 10px 15px;
    min-height: 40px;
  }
  .demo-caption {
    font-size: 9px;
  }
  .hero-bottom {
    margin-top: 32px;
    gap: 8px;
    font-size: 9px;
  }
  .hero-bottom-line {
    margin-inline: 6px;
  }
  .edition {
    font-size: 7px;
    letter-spacing: 0.05em;
  }
  .intro-section {
    position: relative;
    display: block;
    padding: 62px 15px 65px;
    text-align: center;
  }
  .intro-doodle {
    width: 48px;
    margin: 0 auto 20px;
  }
  .intro-section .eyebrow {
    justify-content: center;
    font-size: 9px;
    margin-bottom: 13px;
  }
  .intro-section .section-title {
    font-size: clamp(24px, 4.3vw, 31px);
  }
  .intro-description {
    font-size: 12px;
    max-width: 440px;
    margin: 21px auto 0;
  }
  .features-section {
    padding: 56px 0 58px;
  }
  .section-heading {
    display: block;
    margin-bottom: 29px;
  }
  .section-heading .eyebrow {
    margin-bottom: 13px;
  }
  .section-heading > p {
    max-width: none;
    margin: 12px 0 0;
    font-size: 12px;
  }
  .section-title {
    font-size: 29px;
  }
  .features-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .feature-card {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
  }
  .feature-visual {
    height: auto;
    min-height: 235px;
  }
  .feature-content {
    padding: 24px 23px;
  }
  .feature-card h3 {
    font-size: 19px;
  }
  .feature-card p {
    font-size: 11px;
    margin-bottom: 18px;
  }
  .feature-number {
    font-size: 8px;
    margin-bottom: 13px;
  }
  .small-note {
    top: 50px;
    height: 150px;
  }
  .floating-pen {
    top: 40px;
  }
  .feature-ask .feature-visual {
    padding: 50px 15px;
  }
  .chip-one {
    top: 36px;
  }
  .chip-two {
    top: 44px;
  }
  .chip-three {
    bottom: 35px;
  }
  .topic-mini {
    bottom: 36px;
  }
  .spaces-section {
    padding-top: 59px;
    padding-bottom: 51px;
  }
  .spaces-heading {
    display: block;
    margin-bottom: 29px;
  }
  .spaces-heading > p {
    max-width: 460px;
    margin-top: 17px;
    margin-bottom: 0;
  }
  .spaces-grid {
    grid-template-columns: 1fr;
    gap: 19px;
  }
  .space-card {
    padding: 27px 28px 0;
  }
  .space-card h3 {
    font-size: 24px;
    max-width: 400px;
  }
  .space-card > p {
    font-size: 12px;
    max-width: 440px;
  }
  .space-card li {
    font-size: 11px;
  }
  .space-footer strong {
    font-size: 11px;
  }
  .space-footer small {
    font-size: 9px;
  }
  .personal-sprout {
    width: 75px;
  }
  .space-footer {
    min-height: 88px;
  }
  .spaces-boundary {
    font-size: 9px;
  }
  .closing-section {
    padding-bottom: 53px;
  }
  .closing-inner {
    padding: 38px 29px;
  }
  .closing-copy {
    max-width: 80%;
  }
  .closing-section h2 {
    font-size: 31px;
    line-height: 1.6;
  }
  .closing-description {
    font-size: 11px;
    max-width: 330px;
  }
  .closing-art {
    width: 200px;
    height: 200px;
    right: -93px;
    top: 10px;
    opacity: 0.7;
  }
  .closing-art > span {
    display: none;
  }
  .closing-status {
    font-size: 9px;
  }
  .footer-main {
    gap: 20px;
    padding-bottom: 25px;
  }
  .footer-main .brand {
    font-size: 21px;
  }
  .footer-links {
    gap: 22px;
    font-size: 10px;
  }
  .footer-main p {
    font-size: 10px;
  }
}
@media (max-width: 480px) {
  .container {
    width: calc(100% - 36px);
  }
  .hero {
    padding-top: 39px;
  }
  h1 {
    font-size: clamp(42px, 12vw, 56px);
  }
  .hero-description {
    max-width: 325px;
    font-size: 12px;
  }
  .hero-note {
    font-size: 8px;
  }
  .hero-art {
    width: calc(100% - 8px);
    margin-top: 37px;
  }
  .product-interior {
    grid-template-columns: 1fr;
  }
  .product-sidebar {
    display: none;
  }
  .demo-panel {
    padding: 21px 23px 34px;
    min-height: 386px;
  }
  .demo-heading {
    font-size: 16px;
  }
  .demo-panel p {
    font-size: 11px;
    line-height: 1.9;
  }
  .demo-panel blockquote {
    font-size: 11px;
  }
  .note-topline {
    font-size: 9px;
    margin-bottom: 18px;
  }
  .note-tags span {
    font-size: 9px;
  }
  .attachment-row strong {
    font-size: 9px;
  }
  .attachment-row small {
    font-size: 8px;
  }
  .note-tags {
    margin-bottom: 18px;
  }
  .connection-card {
    width: calc(100% - 5px);
    gap: 9px;
    padding: 12px;
    margin-left: -6px;
  }
  .connection-icon {
    width: 28px;
    height: 28px;
    flex-basis: 28px;
  }
  .connection-card strong {
    font-size: 9px;
  }
  .connection-card small {
    font-size: 7px;
  }
  .connection-label {
    font-size: 7px;
  }
  .mini-constellation {
    display: none;
  }
  .demo-tab {
    font-size: 10px;
    padding: 8px 12px;
    gap: 5px;
  }
  .demo-caption {
    font-size: 8px;
  }
  .topic-group {
    margin-top: 20px;
  }
  .source-row {
    padding-block: 14px;
  }
  .source-row strong {
    font-size: 10px;
  }
  .source-row small {
    font-size: 8px;
  }
  .topic-group-heading strong {
    font-size: 11px;
  }
  .topic-group-heading > span {
    font-size: 8px;
  }
  .answer-block p,
  .answer-block ol {
    font-size: 10px;
  }
  .demo-panel .question-bubble {
    font-size: 11px;
  }
  .answer-sources {
    font-size: 9px;
  }
  .source-button {
    font-size: 9px;
    min-height: 35px;
  }
  .hero-bottom {
    flex-wrap: wrap;
    font-size: 8px;
    margin-top: 28px;
  }
  .hero-bottom .edition {
    display: none;
  }
  .intro-section {
    padding-top: 47px;
    padding-bottom: 49px;
    padding-inline: 0;
  }
  .intro-section .section-title {
    font-size: 25px;
  }
  .intro-description {
    font-size: 11px;
    max-width: 318px;
  }
  .section-title {
    font-size: 26px;
  }
  .eyebrow {
    font-size: 10px;
  }
  .features-section {
    padding-block: 43px;
  }
  .features-grid {
    gap: 18px;
  }
  .feature-card {
    display: flex;
  }
  .feature-visual {
    height: 202px;
    min-height: 202px;
    flex-basis: 202px;
  }
  .feature-content {
    padding: 26px;
  }
  .feature-card h3 {
    font-size: 22px;
    margin-bottom: 13px;
  }
  .feature-card p {
    font-size: 12px;
  }
  .feature-tag {
    font-size: 10px;
  }
  .small-note {
    top: 33px;
    height: 147px;
    width: 57%;
    left: 20%;
    padding: 17px;
  }
  .small-note > strong {
    font-size: 11px;
  }
  .small-note-date {
    font-size: 7px;
  }
  .floating-pen {
    right: 20%;
    top: 27px;
    width: 24px;
    height: 110px;
  }
  .note-sticker {
    font-size: 10px;
  }
  .topic-chip {
    font-size: 11px;
  }
  .chip-one {
    left: 13%;
    top: 22px;
  }
  .chip-two {
    right: 12%;
    top: 33px;
  }
  .chip-three {
    right: 9%;
    bottom: 21px;
  }
  .topic-mini {
    left: 14%;
    bottom: 23px;
    width: 60px;
  }
  .feature-ask .feature-visual {
    padding: 33px 28px;
  }
  .mini-question {
    font-size: 10px;
  }
  .mini-answer strong {
    font-size: 9px;
  }
  .space-card {
    padding: 25px 24px 0;
  }
  .space-card h3 {
    font-size: 22px;
  }
  .space-card-top {
    gap: 15px;
  }
  .space-index {
    font-size: 7px;
  }
  .space-card ul {
    margin-bottom: 20px;
  }
  .space-card li {
    font-size: 10px;
  }
  .space-footer {
    gap: 10px;
    min-height: 83px;
  }
  .personal-sprout {
    width: 56px;
    right: 0;
  }
  .spaces-boundary {
    font-size: 8px;
  }
  .closing-inner {
    padding: 35px 26px;
  }
  .closing-copy {
    max-width: 100%;
  }
  .closing-section h2 {
    font-size: 29px;
  }
  .closing-description {
    max-width: 270px;
    line-height: 1.9;
  }
  .closing-art {
    right: -128px;
    top: 36px;
    opacity: 0.35;
  }
  .closing-section .button {
    font-size: 11px;
    min-height: 46px;
    padding-inline: 17px;
  }
  .closing-status {
    font-size: 8px;
  }
  .footer-main {
    align-items: start;
  }
  .footer-links {
    flex-direction: column;
    align-items: end;
    gap: 15px;
    padding-top: 6px;
    font-size: 9px;
  }
  .footer-bottom {
    font-size: 8px;
  }
  .footer-bottom > span:last-child {
    font-size: 7px;
    letter-spacing: 0.08em;
  }
  .source-dialog {
    padding: 22px;
  }
  .source-dialog h2 {
    font-size: 22px;
  }
  .source-dialog p {
    font-size: 13px;
  }
}

/* 英文的词长与中文不同，允许自然换行并保留相同的阅读层级。 */
html[lang="en"] h1 {
  font-size: clamp(41px, 4.4vw, 62px);
  letter-spacing: -0.055em;
  line-height: 1.14;
}
html[lang="en"] .hero-first {
  max-width: 390px;
}
html[lang="en"] .hero-second em {
  white-space: normal;
}
html[lang="en"] h1 em::after {
  bottom: -3px;
}
html[lang="en"] .hero-description {
  margin-top: 29px;
  font-size: 14px;
}
html[lang="en"] .hero-second > span::after {
  content: " ";
}
html[lang="en"] .section-title {
  line-height: 1.25;
}
html[lang="en"] .hero-note {
  font-size: 9px;
}
html[lang="en"] .feature-card h3 {
  line-height: 1.35;
}
html[lang="en"] .space-card h3 {
  line-height: 1.35;
  max-width: 430px;
}
html[lang="en"] .closing-section h2 {
  line-height: 1.25;
}
html[lang="en"] .demo-panel {
  min-height: 434px;
}
html[lang="en"] .closing-copy {
  max-width: 615px;
}
@media (max-width: 1190px) {
  html[lang="en"] .header-inner {
    gap: 20px;
  }
  html[lang="en"] .nav-links {
    gap: 18px;
    font-size: 11px;
  }
  html[lang="en"] .header-actions {
    gap: 12px;
  }
  html[lang="en"] .demo-panel {
    min-height: 478px;
  }
}
@media (max-width: 960px) {
  html[lang="en"] h1 {
    font-size: 42px;
  }
  html[lang="en"] .hero-description {
    font-size: 12px;
  }
  html[lang="en"] .hero-note {
    font-size: 8px;
  }
  html[lang="en"] .nav-links {
    gap: 14px;
    font-size: 10px;
  }
  html[lang="en"] .header-cta {
    font-size: 9px;
  }
  html[lang="en"] .demo-panel {
    min-height: 514px;
  }
  html[lang="en"] .connection-card strong {
    font-size: 8px;
  }
  html[lang="en"] .demo-tab {
    font-size: 8px;
    padding-inline: 8px;
  }
  html[lang="en"] .closing-copy {
    max-width: 70%;
  }
}
@media (max-width: 760px) {
  html[lang="en"] h1 {
    font-size: clamp(42px, 8vw, 62px);
  }
  html[lang="en"] .hero-first {
    max-width: 540px;
  }
  html[lang="en"] .hero-description {
    font-size: 13px;
  }
  html[lang="en"] .hero-note {
    font-size: 9px;
  }
  html[lang="en"] .demo-panel {
    min-height: 430px;
  }
  html[lang="en"] .demo-tab {
    font-size: 10px;
    padding-inline: 13px;
  }
  html[lang="en"] .nav-links {
    font-size: 12px;
  }
  html[lang="en"] .closing-copy {
    max-width: 90%;
  }
}
@media (max-width: 480px) {
  html[lang="en"] h1 {
    font-size: clamp(39px, 10.8vw, 52px);
  }
  html[lang="en"] .hero-first {
    max-width: 100%;
  }
  html[lang="en"] .hero-description {
    font-size: 12px;
  }
  html[lang="en"] .hero-note {
    font-size: 8px;
  }
  html[lang="en"] .demo-panel {
    min-height: 460px;
  }
  html[lang="en"] .demo-tab {
    padding-inline: 8px;
    font-size: 9px;
  }
  html[lang="en"] .connection-card strong {
    font-size: 9px;
  }
  html[lang="en"] .connection-card small {
    font-size: 8px;
  }
  html[lang="en"] .closing-copy {
    max-width: 100%;
  }
  html[lang="en"] .closing-section h2 {
    font-size: 29px;
  }
  html[lang="en"] .spaces-boundary {
    font-size: 8px;
  }
}