:root {
  --ink: #17191d;
  --paper: #fff8ed;
  --white: #ffffff;
  --red: #f04a3a;
  --red-dark: #c92f25;
  --green: #20a67a;
  --green-dark: #087756;
  --yellow: #ffc857;
  --muted: #65666b;
  --line: #25272b;
  --soft-line: #ded8ce;
  --max: 1180px;
  --shadow: 6px 6px 0 rgba(23, 25, 29, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

body.menu-open {
  overflow: hidden;
}

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

a {
  color: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 1000;
  padding: 8px 14px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-140%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 2px solid var(--line);
  background: rgba(255, 248, 237, 0.97);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(var(--max), calc(100% - 40px));
  min-height: 74px;
  margin: 0 auto;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  gap: 10px;
  color: var(--ink);
  font-weight: 900;
  text-decoration: none;
}

.brand img {
  width: 42px;
  height: 42px;
  border: 2px solid var(--line);
  border-radius: 6px;
}

.brand-name {
  font-size: 20px;
  letter-spacing: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav > a:not(.download-button) {
  padding: 8px 12px;
  border-bottom: 3px solid transparent;
  font-weight: 700;
  text-decoration: none;
}

.site-nav > a[aria-current="page"] {
  border-color: var(--red);
}

.download-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 126px;
  min-height: 46px;
  padding: 10px 20px;
  border: 2px solid var(--line);
  border-radius: 6px;
  color: var(--white);
  background: var(--red);
  box-shadow: 4px 4px 0 var(--line);
  font-weight: 900;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.download-button:hover,
.download-button:focus-visible {
  background: var(--red-dark);
  box-shadow: 2px 2px 0 var(--line);
  transform: translate(2px, 2px);
}

.download-button.light {
  color: var(--ink);
  background: var(--white);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 2px solid var(--line);
  border-radius: 6px;
  background: var(--paper);
}

.menu-toggle span {
  display: block;
  height: 2px;
  margin: 5px 0;
  background: var(--ink);
}

.container {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

.band {
  padding: 86px 0;
  border-bottom: 2px solid var(--line);
}

.band-white {
  background: var(--white);
}

.band-ink {
  color: var(--white);
  background: var(--ink);
}

.band-green {
  color: var(--white);
  background: var(--green-dark);
}

.section-heading {
  margin: 0 0 34px;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.15;
  letter-spacing: 0;
}

.section-kicker {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 10px;
  border: 2px solid currentColor;
  font-size: 13px;
  font-weight: 900;
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 650px;
  padding: 76px 0 64px;
  border-bottom: 2px solid var(--line);
  background: var(--paper);
}

.hero::before,
.hero::after {
  position: absolute;
  z-index: 0;
  content: "";
  pointer-events: none;
}

.hero::before {
  top: 72px;
  right: -110px;
  width: 430px;
  height: 98px;
  border: 3px solid var(--line);
  background: var(--yellow);
  transform: rotate(-10deg);
}

.hero::after {
  bottom: 42px;
  left: -85px;
  width: 300px;
  height: 70px;
  border: 3px solid var(--line);
  background: var(--green);
  transform: rotate(8deg);
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(340px, 0.86fr);
  align-items: center;
  gap: 64px;
}

.hero-copy {
  max-width: 680px;
}

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  padding: 5px 12px;
  border: 2px solid var(--line);
  background: var(--white);
  font-size: 14px;
  font-weight: 900;
}

.hero-label::before {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--green);
  content: "";
}

.hero h1 {
  max-width: 650px;
  margin: 0;
  font-size: clamp(50px, 7vw, 88px);
  line-height: 1.03;
  letter-spacing: 0;
}

.hero-lead {
  max-width: 620px;
  margin: 24px 0 28px;
  color: #3f4146;
  font-size: 19px;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.hero-note {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.hero-visual {
  position: relative;
  min-height: 500px;
}

.phone-frame {
  position: absolute;
  width: min(292px, 74vw);
  padding: 9px;
  border: 3px solid var(--line);
  border-radius: 28px;
  background: var(--ink);
  box-shadow: 14px 16px 0 rgba(23, 25, 29, 0.18);
}

.phone-frame::before {
  position: absolute;
  top: 16px;
  left: 50%;
  z-index: 2;
  width: 74px;
  height: 14px;
  border-radius: 8px;
  background: var(--ink);
  content: "";
  transform: translateX(-50%);
}

.phone-frame img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: 19px;
}

.phone-main {
  top: 0;
  right: 40px;
  z-index: 2;
  transform: rotate(3deg);
}

.phone-back {
  top: 66px;
  left: 0;
  z-index: 1;
  transform: rotate(-7deg) scale(0.84);
}

.comic-stamp {
  position: absolute;
  right: 0;
  bottom: 8px;
  z-index: 3;
  width: 128px;
  padding: 13px 12px;
  border: 3px solid var(--line);
  background: var(--yellow);
  box-shadow: 5px 5px 0 var(--line);
  font-weight: 900;
  line-height: 1.25;
  text-align: center;
  transform: rotate(-5deg);
}

.quick-facts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 2px solid var(--line);
  background: var(--ink);
  color: var(--white);
}

.fact {
  min-height: 112px;
  padding: 24px;
  border-right: 1px solid #45474d;
  text-align: center;
}

.fact:last-child {
  border-right: 0;
}

.fact strong,
.fact span {
  display: block;
}

.fact strong {
  color: var(--yellow);
  font-size: 22px;
}

.fact span {
  color: #d8d8da;
  font-size: 13px;
}

.schedule-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border-top: 2px solid var(--line);
  border-left: 2px solid var(--line);
}

.schedule-day {
  min-height: 180px;
  padding: 22px;
  border-right: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
  background: var(--white);
}

.schedule-day.is-hot {
  color: var(--white);
  background: var(--red);
}

.schedule-day b,
.schedule-day span {
  display: block;
}

.schedule-day b {
  margin-bottom: 30px;
  font-size: 14px;
}

.schedule-day span {
  font-size: 21px;
  font-weight: 900;
  line-height: 1.35;
}

.schedule-day small {
  display: block;
  margin-top: 8px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.feature-card {
  min-height: 230px;
  padding: 28px;
  border: 2px solid var(--line);
  border-radius: 6px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.feature-card:nth-child(2),
.feature-card:nth-child(5) {
  background: #e9f8f2;
}

.feature-card:nth-child(3),
.feature-card:nth-child(4) {
  background: #fff0bd;
}

.feature-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  margin-bottom: 22px;
  border: 2px solid var(--line);
  border-radius: 50%;
  color: var(--white);
  background: var(--red);
  font-weight: 900;
}

.feature-card h3 {
  margin: 0 0 10px;
  font-size: 22px;
}

.feature-card p {
  margin: 0;
  color: #484a4f;
}

.showcase-layout {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  align-items: start;
  gap: 56px;
}

.showcase-copy {
  position: sticky;
  top: 112px;
}

.showcase-copy ul {
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
}

.showcase-copy li {
  padding: 14px 0;
  border-bottom: 1px solid #57595e;
}

.screen-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-bottom: 18px;
  border: 2px solid var(--white);
}

.screen-tab {
  min-height: 44px;
  border: 0;
  border-right: 1px solid var(--white);
  color: var(--white);
  background: transparent;
  cursor: pointer;
  font-weight: 800;
}

.screen-tab:last-child {
  border-right: 0;
}

.screen-tab[aria-selected="true"] {
  color: var(--ink);
  background: var(--yellow);
}

.screen-stage {
  min-height: 720px;
  padding: 36px;
  border: 2px solid var(--white);
  background: #292b30;
}

.screen-panel {
  display: none;
}

.screen-panel.is-active {
  display: grid;
  grid-template-columns: minmax(240px, 360px) 1fr;
  align-items: center;
  gap: 34px;
}

.screen-panel img,
.preview-image {
  width: 100%;
  max-width: 400px;
  height: auto;
  border: 3px solid var(--white);
  border-radius: 8px;
}

.screen-caption b {
  display: block;
  margin-bottom: 12px;
  color: var(--yellow);
  font-size: 24px;
}

.screen-caption p {
  margin: 0;
  color: #dedee0;
}

.deep-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.deep-link {
  display: grid;
  grid-template-columns: 76px 1fr auto;
  align-items: center;
  min-height: 150px;
  padding: 24px;
  border: 2px solid var(--line);
  border-radius: 6px;
  background: var(--white);
  box-shadow: var(--shadow);
  text-decoration: none;
  transition: transform 160ms ease;
}

.deep-link:hover,
.deep-link:focus-visible {
  transform: translateY(-4px);
}

.deep-link-index {
  color: var(--red);
  font-size: 34px;
  font-weight: 900;
}

.deep-link strong,
.deep-link small {
  display: block;
}

.deep-link strong {
  font-size: 21px;
}

.deep-link small {
  margin-top: 5px;
  color: var(--muted);
}

.deep-link-arrow {
  font-size: 30px;
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.review {
  margin: 0;
  padding: 28px;
  border: 2px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.review p {
  margin: 0 0 22px;
  font-size: 18px;
  font-weight: 700;
}

.review footer {
  color: var(--muted);
  font-size: 14px;
}

.faq-list {
  border-top: 2px solid var(--line);
}

.faq-item {
  border-bottom: 2px solid var(--line);
}

.faq-item summary {
  position: relative;
  padding: 22px 54px 22px 0;
  cursor: pointer;
  font-size: 18px;
  font-weight: 900;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  position: absolute;
  top: 20px;
  right: 8px;
  width: 32px;
  height: 32px;
  border: 2px solid var(--line);
  border-radius: 50%;
  content: "+";
  line-height: 27px;
  text-align: center;
}

.faq-item[open] summary::after {
  content: "-";
}

.faq-answer {
  max-width: 900px;
  padding: 0 54px 24px 0;
  color: #494b50;
}

.faq-answer p {
  margin: 0 0 10px;
}

.text-link {
  color: var(--green-dark);
  font-weight: 900;
}

.cta-band {
  padding: 62px 0;
  border-bottom: 2px solid var(--line);
  color: var(--white);
  background: var(--red);
}

.cta-layout {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 32px;
}

.cta-layout h2 {
  margin: 0 0 8px;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.12;
}

.cta-layout .cta-copy-line {
  margin: 0;
  color: #fff0ea;
}

.inner-hero {
  padding: 76px 0 66px;
  border-bottom: 2px solid var(--line);
  background: var(--yellow);
}

.inner-hero.green {
  color: var(--white);
  background: var(--green-dark);
}

.breadcrumb {
  margin-bottom: 24px;
  font-size: 14px;
  font-weight: 800;
}

.breadcrumb a {
  text-decoration-thickness: 2px;
}

.inner-hero h1 {
  max-width: 860px;
  margin: 0 0 20px;
  font-size: clamp(42px, 6vw, 72px);
  line-height: 1.08;
  letter-spacing: 0;
}

.inner-hero p {
  max-width: 800px;
  margin: 0;
  font-size: 18px;
}

.article-shell {
  display: grid;
  grid-template-columns: 240px minmax(0, 820px);
  align-items: start;
  justify-content: space-between;
  gap: 72px;
}

.article-nav {
  position: sticky;
  top: 112px;
  padding: 22px;
  border: 2px solid var(--line);
  background: var(--white);
  box-shadow: 5px 5px 0 rgba(23, 25, 29, 0.13);
}

.article-nav b {
  display: block;
  margin-bottom: 12px;
}

.article-nav a {
  display: block;
  padding: 8px 0;
  border-bottom: 1px solid var(--soft-line);
  color: #484a4f;
  text-decoration: none;
}

.article-nav a:hover,
.article-nav a:focus-visible {
  color: var(--red-dark);
}

.prose-section {
  padding: 0 0 54px;
  scroll-margin-top: 112px;
}

.prose-section + .prose-section {
  padding-top: 54px;
  border-top: 2px solid var(--line);
}

.prose-section h2 {
  margin: 0 0 24px;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.22;
}

.prose-section h3 {
  margin: 26px 0 8px;
  font-size: 21px;
}

.prose-section p {
  margin: 0 0 16px;
}

.step-list {
  display: grid;
  gap: 16px;
}

.step {
  display: grid;
  grid-template-columns: 68px 1fr;
  gap: 20px;
  padding: 24px;
  border: 2px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.step-index {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border: 2px solid var(--line);
  border-radius: 50%;
  color: var(--white);
  background: var(--red);
  font-size: 22px;
  font-weight: 900;
}

.step h3 {
  margin: 0 0 8px;
}

.step p {
  margin: 0;
}

.check-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.check-item {
  padding: 20px;
  border-left: 6px solid var(--green);
  background: #e9f8f2;
}

.check-item b {
  display: block;
  margin-bottom: 6px;
}

.function-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--white);
}

.function-table th,
.function-table td {
  padding: 16px;
  border: 2px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.function-table th {
  background: var(--yellow);
}

.callout {
  margin: 24px 0;
  padding: 22px;
  border: 2px solid var(--line);
  border-left: 10px solid var(--red);
  background: var(--white);
}

.callout b {
  display: block;
  margin-bottom: 5px;
}

.site-footer {
  padding: 50px 0 28px;
  color: #d9d9dc;
  background: var(--ink);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr 0.65fr;
  gap: 48px;
  padding-bottom: 34px;
}

.footer-brand {
  color: var(--white);
}

.footer-brand p {
  max-width: 560px;
  color: #bfc0c4;
}

.footer-title {
  margin: 0 0 12px;
  color: var(--yellow);
  font-size: 15px;
}

.footer-links a {
  display: block;
  padding: 4px 0;
  color: #d9d9dc;
  text-decoration: none;
}

.disclaimer {
  padding: 18px 0;
  border-top: 1px solid #3e4045;
  border-bottom: 1px solid #3e4045;
  color: #b9bac0;
  font-size: 13px;
}

.copyright {
  margin: 22px 0 0;
  color: #8f9096;
  font-size: 13px;
}

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

@media (max-width: 980px) {
  .hero-grid,
  .showcase-layout,
  .article-shell {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    width: min(570px, 100%);
    margin: 0 auto;
  }

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

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

  .showcase-copy,
  .article-nav {
    position: static;
  }

  .article-nav {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0 18px;
  }

  .article-nav b {
    grid-column: 1 / -1;
  }

  .footer-grid {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

@media (max-width: 760px) {
  .nav-wrap,
  .container {
    width: min(100% - 28px, var(--max));
  }

  .nav-wrap {
    min-height: 66px;
  }

  .brand-name {
    font-size: 18px;
  }

  .brand img {
    width: 38px;
    height: 38px;
  }

  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: 66px;
    right: 0;
    bottom: 0;
    left: 0;
    display: none;
    align-items: stretch;
    flex-direction: column;
    padding: 24px;
    border-top: 2px solid var(--line);
    background: var(--paper);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav > a:not(.download-button) {
    padding: 14px 4px;
    border-bottom: 2px solid var(--soft-line);
  }

  .site-nav .download-button {
    margin-top: 16px;
  }

  .band {
    padding: 62px 0;
  }

  .hero {
    min-height: auto;
    padding: 54px 0 28px;
  }

  .hero-grid {
    gap: 22px;
  }

  .hero::before {
    right: -230px;
  }

  .hero h1 {
    font-size: 50px;
  }

  .hero-lead {
    font-size: 17px;
  }

  .hero-visual {
    min-height: 315px;
  }

  .phone-frame {
    width: 170px;
  }

  .phone-main {
    right: 30px;
  }

  .phone-back {
    top: 28px;
    left: 4px;
  }

  .comic-stamp {
    right: 0;
    bottom: 6px;
  }

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

  .fact:nth-child(2) {
    border-right: 0;
  }

  .fact:nth-child(-n + 2) {
    border-bottom: 1px solid #45474d;
  }

  .schedule-grid,
  .feature-grid,
  .deep-links,
  .review-grid,
  .check-grid {
    grid-template-columns: 1fr;
  }

  .schedule-day {
    min-height: 140px;
  }

  .screen-stage {
    min-height: 0;
    padding: 18px;
  }

  .screen-panel.is-active {
    grid-template-columns: 1fr;
  }

  .screen-panel img {
    margin: 0 auto;
  }

  .deep-link {
    grid-template-columns: 56px 1fr auto;
  }

  .cta-layout,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .cta-layout .download-button {
    width: 100%;
  }

  .inner-hero {
    padding: 56px 0 48px;
  }

  .inner-hero h1 {
    font-size: 42px;
  }

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

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

  .function-table,
  .function-table tbody,
  .function-table tr,
  .function-table th,
  .function-table td {
    display: block;
  }

  .function-table tr {
    border: 2px solid var(--line);
    border-bottom: 0;
  }

  .function-table tr:last-child {
    border-bottom: 2px solid var(--line);
  }

  .function-table th,
  .function-table td {
    border: 0;
    border-bottom: 1px solid var(--soft-line);
  }
}

@media (max-width: 420px) {
  .hero h1 {
    font-size: 43px;
  }

  .hero-visual {
    min-height: 305px;
  }

  .phone-frame {
    width: 166px;
  }

  .comic-stamp {
    width: 108px;
    font-size: 13px;
  }

  .section-heading {
    font-size: 34px;
  }

  .screen-tabs {
    grid-template-columns: 1fr;
  }

  .screen-tab {
    border-right: 0;
    border-bottom: 1px solid var(--white);
  }

  .screen-tab:last-child {
    border-bottom: 0;
  }

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

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}