:root {
  --bg: #f2f5f7;
  --paper: #fff;
  --ink: #303336;
  --mute: #6e747a;
  --line: #e4e8ec;
  --blue: #2f6fed;
  --blue-2: #1f5ad4;
  --font: "PingFang TC", "Hiragino Sans CNS", "Microsoft JhengHei", sans-serif;
  --page-pad: 40px;
}

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

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  color: var(--blue-2);
}

button,
input {
  font: inherit;
}

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

.wrap {
  width: min(1040px, 100%);
  margin: 0 auto;
  padding-left: max(var(--page-pad), env(safe-area-inset-left, 0px));
  padding-right: max(var(--page-pad), env(safe-area-inset-right, 0px));
}

#main:not(.wrap) {
  padding-left: max(var(--page-pad), env(safe-area-inset-left, 0px));
  padding-right: max(var(--page-pad), env(safe-area-inset-right, 0px));
}

#main:not(.wrap) .wrap {
  padding-left: 0;
  padding-right: 0;
}

.skip {
  position: absolute;
  left: 12px;
  top: -40px;
  z-index: 20;
  background: var(--paper);
  padding: 8px 12px;
}

.skip:focus {
  top: 12px;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  padding-top: env(safe-area-inset-top);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid rgb(0 0 0 / 6%);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 52px;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
  font-weight: 600;
  font-size: 15px;
}

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

.brand-mark,
.brand-icon {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: var(--paper);
}

.brand-icon {
  display: block;
}

.nav-toggle {
  display: none;
  margin-right: -8px;
  border: 0;
  background: none;
  color: var(--ink);
  font-size: 14px;
  min-width: 2.75em;
  min-height: 44px;
  padding: 0;
  text-align: right;
  cursor: pointer;
  touch-action: manipulation;
}

.nav-mask,
.nav-drawer {
  display: none;
}

.nav-mask:not([hidden]) {
  display: block;
  position: fixed;
  inset: 0;
  z-index: 9;
  background: rgb(48 51 54 / 28%);
}

.nav-drawer:not([hidden]) {
  display: block;
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  z-index: 11;
  background: var(--bg);
  border-bottom: 1px solid rgb(0 0 0 / 6%);
  padding: 8px 0 24px;
}

.nav-drawer-links a {
  display: flex;
  align-items: center;
  min-height: 48px;
  color: var(--ink);
  font-size: 17px;
}

.nav-drawer-links a.is-on {
  color: var(--blue);
}

.nav-drawer-download {
  width: 100%;
  margin-top: 16px;
}

.nav-lock {
  overflow: hidden;
}

.nav-links {
  display: flex;
  gap: 22px;
  font-size: 14px;
}

.nav-links a {
  color: var(--mute);
}

.nav-links a:hover,
.nav-links a.is-on {
  color: var(--ink);
}

.nav-end {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang {
  position: relative;
}

.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 32px;
  padding: 0 12px 0 10px;
  border: 1px solid var(--line);
  border-radius: 980px;
  background: var(--paper);
  color: var(--ink);
  font-size: 13px;
  cursor: pointer;
}

.lang-btn::after {
  content: "";
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid var(--mute);
}

.lang-btn[aria-expanded="true"]::after {
  transform: rotate(180deg);
}

.lang-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 20;
  width: 168px;
  max-height: 320px;
  overflow: auto;
  margin: 0;
  padding: 6px;
  list-style: none;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 16px 40px rgb(48 51 54 / 10%);
}

.lang-menu a,
.lang-menu button {
  display: block;
  width: 100%;
  text-align: left;
  border: 0;
  background: none;
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--ink);
  cursor: pointer;
  text-decoration: none;
}

.lang-menu a:hover,
.lang-menu button:hover,
.lang-menu a.is-on,
.lang-menu button.is-on {
  background: var(--bg);
}

.lang-menu a.is-on,
.lang-menu button.is-on {
  color: var(--blue);
}


.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 980px;
  background: var(--blue);
  color: #fff;
  font-size: 15px;
  font-weight: 500;
}

.btn:hover {
  background: var(--blue-2);
  color: #fff;
}

.btn-sm {
  min-height: 32px;
  padding: 0 12px;
  font-size: 13px;
}

.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 64px;
  align-items: center;
  padding: 64px 0 24px;
  text-align: left;
}

.app-icon {
  width: 72px;
  height: 72px;
  margin: 0 0 18px;
  border-radius: 16px;
  filter: drop-shadow(0 12px 24px rgb(47 111 237 / 18%));
}

.kicker {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--mute);
}

h1 {
  margin: 0;
  font-size: clamp(32px, 4.6vw, 48px);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.15;
}

.tag {
  max-width: 520px;
  margin: 16px 0 0;
  color: var(--mute);
  font-size: 17px;
  line-height: 1.6;
}

.need {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  color: var(--ink);
  font-size: 15px;
}

.need li {
  position: relative;
  padding: 5px 0 5px 16px;
}

.need li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 13px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--blue);
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 22px;
  margin: 28px 0 0;
}

.text-link {
  font-size: 15px;
}

.meta {
  margin: 16px 0 0;
  font-size: 13px;
  color: var(--mute);
}

.stage {
  width: min(360px, 100%);
  margin: 0 auto;
}

.stage.compact {
  margin: 0;
}

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  padding: 28px 0 8px;
  font-size: 14px;
}

.toc a {
  color: var(--mute);
}

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

.prose {
  max-width: 720px;
  margin: 36px auto 0;
  color: var(--mute);
  font-size: 16px;
}

.prose p + p {
  margin-top: 14px;
}

.glossary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 40px;
}

.glossary h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.glossary p {
  margin: 0;
  color: var(--mute);
  font-size: 15px;
}

.plain {
  width: 100%;
  margin-top: 40px;
  border-collapse: collapse;
  font-size: 14px;
  text-align: left;
}

.plain caption {
  caption-side: top;
  text-align: left;
  font-weight: 600;
  margin-bottom: 10px;
}

.plain th,
.plain td {
  padding: 12px 16px 12px 0;
  border-top: 1px solid var(--line);
  vertical-align: top;
  color: var(--mute);
  font-weight: 400;
}

.plain thead th,
.plain tbody th {
  color: var(--ink);
  font-weight: 600;
}

.split {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 56px;
  align-items: start;
  margin-top: 40px;
}

.sub {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--mute);
  font-weight: 600;
}

.aside {
  position: sticky;
  top: 76px;
}

.aside-kicker {
  margin: 0 0 6px;
  font-size: 13px;
  color: var(--mute);
}

.aside h3 {
  margin: 0 0 8px;
  font-size: 22px;
}

.aside > p {
  margin: 0 0 20px;
  color: var(--mute);
  font-size: 15px;
}

.aside .btn {
  width: 100%;
}

.aside-note {
  margin-top: 14px !important;
  font-size: 13px !important;
}

.chapter {
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.chapter header {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

.chapter header span {
  font-size: 15px;
  font-weight: 600;
  color: var(--blue);
  padding-top: 4px;
}

.chapter header h3 {
  margin: 0 0 4px;
  font-size: 24px;
}

.chapter header p {
  margin: 0;
  color: var(--mute);
  font-size: 15px;
}

.chapter-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
}

.chapter-body h4 {
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 600;
}

.chapter-body h4 + ol + h4 {
  margin-top: 22px;
}

.chapter-body ol {
  margin: 0;
  padding-left: 18px;
  color: var(--mute);
  font-size: 15px;
}

.chapter-body li + li {
  margin-top: 6px;
}

.chapter-body p {
  margin: 0;
  color: var(--mute);
  font-size: 15px;
}

h2.left,
.lead.left {
  text-align: left;
  margin-left: 0;
}

.plain-list {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.plain-list li {
  padding: 12px 0;
  border-top: 1px solid var(--line);
  color: var(--mute);
  font-size: 15px;
}

.plain-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.plain-list strong {
  display: block;
  color: var(--ink);
  margin-bottom: 4px;
}

.plain-list li.is-on strong {
  color: var(--blue);
}

.issues {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px 40px;
  margin-top: 40px;
}

.issues h3 {
  margin: 0 0 8px;
  font-size: 17px;
}

.issues p {
  margin: 0;
  color: var(--mute);
  font-size: 15px;
}

.device {
  background: var(--paper);
  border-radius: 28px;
  box-shadow:
    0 1px 0 rgb(255 255 255 / 80%) inset,
    0 24px 60px rgb(48 51 54 / 10%);
  overflow: hidden;
  text-align: left;
  transform: rotate(-1.5deg);
}

.device-bar {
  padding: 16px 20px 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--mute);
}

.device-screen {
  min-height: 280px;
  padding: 4px 20px 16px;
}

.device-screen h4 {
  margin: 0 0 4px;
  font-size: 22px;
  font-weight: 600;
}

.phone-sub {
  margin: 0 0 16px;
  color: var(--mute);
  font-size: 14px;
}

.row,
.field {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-top: 1px solid var(--line);
  font-size: 15px;
}

.pill,
.toggle {
  color: var(--blue);
  font-size: 14px;
}

.toggle i {
  font-style: normal;
}

.toggle.on i::before { content: "开"; }
.toggle:not(.on) i::before { content: "关"; }

.device-tabs {
  display: flex;
  justify-content: space-around;
  padding: 10px 8px 14px;
  background: #f7f8fa;
}

.device-tabs button {
  border: 0;
  background: none;
  color: var(--mute);
  font-size: 13px;
  padding: 6px 8px;
  cursor: pointer;
}

.device-tabs button.is-on {
  color: var(--blue);
  font-weight: 600;
}

.stage-note {
  margin: 22px 0 0;
  font-size: 13px;
  color: var(--mute);
  transform: none;
}

.band {
  background: var(--paper);
  margin-top: 80px;
  margin-left: calc(-1 * max(var(--page-pad), env(safe-area-inset-left, 0px)));
  margin-right: calc(-1 * max(var(--page-pad), env(safe-area-inset-right, 0px)));
  padding: 72px max(var(--page-pad), env(safe-area-inset-right, 0px)) 72px max(var(--page-pad), env(safe-area-inset-left, 0px));
}

.block {
  padding: 72px 0 8px;
}

h2 {
  margin: 0;
  text-align: center;
  font-size: 36px;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.lead {
  text-align: center;
  max-width: 440px;
  margin: 10px auto 0;
  color: var(--mute);
}

.trio {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px;
  margin-top: 48px;
}

.trio h3,
.howto h3,
.cases h3 {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 600;
}

.trio p,
.howto p,
.cases p {
  margin: 0;
  color: var(--mute);
  font-size: 15px;
}

.howto,
.cases {
  list-style: none;
  margin: 48px 0 0;
  padding: 0;
  counter-reset: item;
}

.howto li,
.cases li {
  display: grid;
  grid-template-columns: 48px 1fr;
  column-gap: 16px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.howto li:last-child,
.cases li:last-child {
  border-bottom: 1px solid var(--line);
}

.howto li::before,
.cases li::before {
  counter-increment: item;
  content: counter(item);
  font-size: 15px;
  font-weight: 600;
  color: var(--blue);
  padding-top: 3px;
}

.howto h3,
.howto p,
.cases h3,
.cases p {
  grid-column: 2;
}

.hint {
  margin-top: 8px !important;
  font-size: 14px !important;
}

.hint::before {
  content: "注意 · ";
  color: var(--ink);
  font-weight: 600;
}

.faq {
  max-width: 760px;
  margin: 40px auto 0;
}

details {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

details:last-child {
  border-bottom: 1px solid var(--line);
}

summary {
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  overflow-wrap: break-word;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  color: var(--mute);
  font-weight: 400;
}

details[open] summary::after {
  content: "–";
}

details p {
  margin: 10px 0 0;
  color: var(--mute);
  font-size: 15px;
}

.foot {
  padding: 36px 0 48px;
  font-size: 13px;
  color: var(--mute);
}

.foot-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

.foot a {
  color: var(--mute);
}

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

.phone-shot {
  display: block;
  width: min(280px, 100%);
  max-width: 100%;
  margin: 0 auto;
  padding: 10px;
  background: #1d1d1f;
  border-radius: 28px;
  box-shadow: 0 24px 60px rgb(48 51 54 / 12%);
}

.phone-shot img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 20px;
  background: #fff;
}

.page-hero {
  padding: 56px 0 12px;
}

.page-hero h1 {
  font-size: clamp(32px, 4vw, 44px);
}

.crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 24px 0 0;
  font-size: 14px;
}

.lesson {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 48px;
  align-items: start;
  padding: 40px 0;
  border-top: 1px solid var(--line);
}

.lesson > * {
  min-width: 0;
}

.lesson figure {
  max-width: 100%;
}

.lesson-copy h3 {
  margin: 0 0 8px;
  font-size: 24px;
}

.lesson-copy .no {
  display: block;
  color: var(--blue);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
}

.lesson-copy ol,
.lesson-copy ul {
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--mute);
  font-size: 15px;
}

.lesson-copy li + li {
  margin-top: 6px;
}

.lesson-copy p {
  margin: 10px 0 0;
  color: var(--mute);
  font-size: 15px;
}

.shot-cap {
  margin: 10px 0 0;
  font-size: 12px;
  color: var(--mute);
  text-align: center;
}

.credit {
  margin: 8px 0 0;
  font-size: 12px;
  color: var(--mute);
}

.demo-board {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  align-items: start;
  padding: 12px 0 40px;
}

.demo-steps {
  margin: 0;
  padding: 0;
  list-style: none;
}

.demo-steps button {
  display: block;
  width: 100%;
  text-align: left;
  border: 0;
  border-top: 1px solid var(--line);
  background: none;
  min-height: 48px;
  padding: 14px 0;
  cursor: pointer;
  color: var(--ink);
}

.demo-steps li:last-child button {
  border-bottom: 1px solid var(--line);
}

.demo-steps button.is-on strong {
  color: var(--blue);
}

.demo-steps strong {
  display: block;
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.demo-steps span {
  color: var(--mute);
  font-size: 14px;
}

.thumbs {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  margin: 8px 0 48px;
}

.thumbs button {
  padding: 0;
  border: 2px solid transparent;
  background: none;
  border-radius: 10px;
  cursor: pointer;
}

.thumbs button.is-on,
.thumbs button:hover {
  border-color: var(--blue);
}

.thumbs img {
  width: 100%;
  display: block;
  border-radius: 8px;
}

.faq-group {
  padding: 40px 0 8px;
  border-top: 1px solid var(--line);
}

.faq-group h2 {
  text-align: left;
  font-size: 24px;
}

.faq-group .lead {
  margin-top: 8px;
}

.faq-group .faq {
  max-width: none;
  margin-top: 20px;
}

.faq-more {
  margin: 28px 0 48px;
  font-size: 15px;
}

.download-hero {
  text-align: center;
}

.download-hero .app-icon,
.download-hero .tag,
.download-hero .hero-actions,
.download-hero .meta {
  margin-left: auto;
  margin-right: auto;
}

.download-hero .hero-actions {
  justify-content: center;
}

.download-store {
  padding: 48px 0 72px;
  border-top: 1px solid var(--line);
}

.blog-index .page-hero,
.post-list {
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

.post-list {
  margin-top: 36px;
  margin-bottom: 72px;
}

.post-list a {
  display: block;
  padding: 22px 0;
  border-top: 1px solid var(--line);
  color: inherit;
  text-decoration: none;
}

.post-list a:last-child {
  border-bottom: 1px solid var(--line);
}

.post-list a:hover h2 {
  color: var(--blue);
}

.post-meta {
  font-size: 13px;
  color: var(--mute);
}

.post-list h2 {
  margin: 6px 0;
  text-align: left;
  font-size: 22px;
}

.post-list p {
  margin: 6px 0 0;
  color: var(--mute);
  font-size: 15px;
}

.article {
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  padding-bottom: 140px;
}

.article .page-hero {
  padding-top: 16px;
}

.article .tag {
  max-width: none;
}

.article-body {
  margin-top: 28px;
  overflow-wrap: break-word;
}

.article-body h2 {
  margin: 32px 0 10px;
  text-align: left;
  font-size: 22px;
}

.article-body p,
.article-body li {
  color: var(--mute);
  font-size: 16px;
}

.article-body p + p {
  margin-top: 14px;
}

.article-body ol,
.article-body ul {
  margin: 12px 0 0;
  padding-left: 18px;
}

.article-body li + li {
  margin-top: 6px;
}

.article-nav {
  margin-top: 28px;
  font-size: 14px;
}

.article-pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 24px;
}

.article-pager a {
  min-width: 0;
}

.article-pager .is-next {
  text-align: right;
  grid-column: 2;
}

.article-pager span {
  display: block;
  margin-bottom: 4px;
  color: var(--mute);
  font-size: 12px;
}

.article-back {
  display: inline-block;
  margin-top: 16px;
  color: var(--mute);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 8px;
  margin: 28px 0 8px;
  font-size: 13px;
  color: var(--mute);
}

.breadcrumb a {
  color: var(--mute);
}

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

.breadcrumb i {
  font-style: normal;
  color: #c4c8cc;
}

.breadcrumb span {
  color: var(--ink);
}

.dl-card {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  align-items: start;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.dl-card img {
  border-radius: 12px;
}

.dl-card strong {
  display: block;
  font-size: 17px;
  margin-bottom: 6px;
}

.dl-card p {
  margin: 0;
  color: var(--mute);
  font-size: 14px;
}

.dl-card p + p {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.dl-float {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 16;
  display: flex;
  gap: 10px;
  align-items: center;
  width: min(260px, calc(100% - 32px));
  padding: 12px 36px 12px 12px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 16px 40px rgb(48 51 54 / 12%);
}

.dl-float img {
  border-radius: 9px;
}

.dl-float strong {
  display: block;
  font-size: 14px;
}

.dl-float p {
  margin: 0;
  font-size: 12px;
  color: var(--mute);
}

.dl-float a {
  font-size: 13px;
}

.dl-float-close {
  position: absolute;
  top: 6px;
  right: 8px;
  border: 0;
  background: none;
  color: var(--mute);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}

@media (max-width: 800px) {
  h2 { font-size: 28px; }

  :root {
    --page-pad: 32px;
  }

  .nav-inner {
    gap: 12px;
    min-height: 48px;
  }

  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: flex-end;
  }

  .nav-bar-download {
    display: none;
  }

  .nav-end {
    gap: 8px;
  }

  .lang-btn {
    padding: 0 10px 0 8px;
  }

  .hero,
  .trio,
  .glossary,
  .split,
  .chapter-body,
  .issues,
  .lesson,
  .demo-board,
  .foot-inner {
    grid-template-columns: 1fr;
  }

  .howto li,
  .cases li {
    grid-template-columns: 28px 1fr;
  }

  .hero {
    gap: 32px;
    padding-top: 36px;
  }

  .hero-actions {
    flex-wrap: wrap;
    gap: 14px 18px;
  }

  .tag {
    font-size: 16px;
  }

  .aside {
    position: static;
  }

  .stage {
    margin: 0 auto;
  }

  .device {
    transform: none;
  }

  .foot-inner {
    flex-direction: column;
  }

  .band {
    margin-top: 56px;
    padding-top: 48px;
    padding-bottom: 48px;
  }

  .block {
    padding: 48px 0 8px;
  }

  .page-hero {
    padding-top: 36px;
  }

  .plain {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .thumbs {
    grid-template-columns: repeat(4, 1fr);
  }

  .dl-card {
    grid-template-columns: 40px 1fr;
    gap: 12px;
  }

  .dl-float {
    right: max(12px, env(safe-area-inset-right));
    bottom: max(12px, env(safe-area-inset-bottom));
  }

  .lesson {
    gap: 24px;
  }
}

@media (max-width: 560px) {
  :root {
    --page-pad: 28px;
  }

  body {
    font-size: 16px;
  }

  h2 {
    font-size: 24px;
  }

  .app-icon {
    width: 60px;
    height: 60px;
    border-radius: 14px;
  }

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

  .download-hero .hero-actions {
    flex-direction: column;
  }

  .chapter header,
  .howto li,
  .cases li {
    grid-template-columns: 28px 1fr;
    gap: 12px;
  }

  .chapter header h3,
  .lesson-copy h3 {
    font-size: 20px;
  }

  .trio {
    gap: 24px;
  }

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

  .article-pager {
    grid-template-columns: 1fr;
  }

  .article-pager .is-next {
    text-align: left;
    grid-column: auto;
  }

  .breadcrumb {
    margin-top: 20px;
  }

  .article {
    padding-bottom: 120px;
  }

  .foot {
    padding-bottom: calc(36px + env(safe-area-inset-bottom));
  }
}

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

.seo-chrome {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.seo-chrome .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  min-height: 52px;
  padding-top: 10px;
  padding-bottom: 10px;
}
.seo-chrome nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}
.seo-chrome nav a {
  color: var(--ink);
  font-weight: 600;
  font-size: 14px;
}
.seo-chrome nav a:hover {
  color: var(--blue);
}
.seo-nav {
  display: none;
}