:root {
  color-scheme: light;
  --page: #F4F6F5;
  --surface: #FFFFFF;
  --ink: #18211E;
  --muted: #5C6863;
  --action: #087A55;
  --action-strong: #056143;
  --success-soft: #E6F3ED;
  --line: #D9E0DD;
  --info-soft: #EDF4F3;
  --warning: #B3473D;
  --warning-soft: #FFF1EF;
  --radius: 6px;
  --content: 1180px;
  --step-track: 172px;
  font-family: "Microsoft YaHei UI", "PingFang SC", system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  background: var(--page);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0;
}

button,
input,
select,
textarea {
  font: inherit;
}

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

a {
  color: var(--action-strong);
}

a,
code {
  overflow-wrap: anywhere;
}

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

h1,
h2,
p {
  margin-top: 0;
}

h1,
h2 {
  line-height: 1.12;
  letter-spacing: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 20px;
  font-size: 40px;
  font-weight: 800;
}

h2 {
  margin-bottom: 18px;
  font-size: 32px;
  font-weight: 760;
}

.step h2 {
  margin-bottom: 14px;
  font-size: 28px;
}

code,
.invite-code,
.eyebrow,
.check-number,
.step-meta,
.route-nav a span,
.quick-steps span {
  font-family: Consolas, "SFMono-Regular", monospace;
}

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--action) 62%, white);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  min-height: 44px;
  padding: 10px 14px;
  transform: translateY(-160%);
  border-radius: var(--radius);
  background: var(--ink);
  color: white;
}

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

.site-header {
  position: sticky;
  z-index: 30;
  top: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  min-height: 64px;
  padding: 10px max(16px, calc((100vw - var(--content)) / 2));
  border-bottom: 1px solid rgb(217 224 221 / 88%);
  background: rgb(255 255 255 / 94%);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 760;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 32px;
  flex: 0 0 32px;
  aspect-ratio: 1;
  place-items: center;
  border-radius: 4px;
  background: var(--ink);
  color: white;
  font-size: 14px;
}

.duration {
  display: none;
  color: var(--muted);
  font-size: 14px;
}

.header-cta,
.button,
.mobile-cta {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  font-weight: 760;
  text-decoration: none;
}

.header-cta {
  min-height: 44px;
  padding: 9px 16px;
  background: var(--action);
  color: white;
}

.hero {
  display: grid;
  max-width: var(--content);
  margin: 0 auto;
  padding: 36px 16px 32px;
}

.hero-copy {
  min-width: 0;
}

.eyebrow,
.section-kicker {
  margin-bottom: 14px;
  color: var(--action);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.hero-summary {
  max-width: 650px;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 18px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 0;
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 14px;
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
}

.hero-meta span + span::before {
  width: 1px;
  height: 14px;
  margin: 0 12px;
  background: var(--line);
  content: "";
}

.benefit-copy {
  max-width: 760px;
  margin-bottom: 26px;
  color: var(--ink);
}

.hero-actions,
.final-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
}

.button {
  padding: 12px 20px;
}

.button-primary {
  background: var(--action);
  color: white;
}

.header-cta:hover,
.button-primary:hover,
.mobile-cta:hover {
  background: var(--action-strong);
}

.header-cta:active,
.button-primary:active,
.mobile-cta:active {
  transform: translateY(1px);
}

.text-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  font-weight: 760;
  text-underline-offset: 5px;
}

.quick-steps {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1px;
  margin: 24px 0 0;
  padding: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
  list-style: none;
}

.quick-steps li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3px;
  min-height: 62px;
  align-content: center;
  padding: 7px 3px;
  background: var(--surface);
  font-size: 11px;
  font-weight: 700;
  line-height: 1.35;
  text-align: center;
}

.quick-steps span {
  color: var(--action);
  font-size: 10px;
}

.invite-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px 16px;
  align-self: center;
  width: min(100%, 360px);
  margin-top: 24px;
  padding: 16px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--action);
  border-radius: var(--radius);
  background: var(--surface);
}

.invite-label {
  grid-column: 1 / -1;
  display: block;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
}

.invite-code {
  display: block;
  align-self: center;
  margin-bottom: 0;
  font-size: 36px;
  line-height: 1;
}

.copy-button {
  min-height: 44px;
  padding: 9px 14px;
  border: 1px solid var(--action);
  border-radius: 5px;
  background: transparent;
  color: var(--action-strong);
  font-weight: 760;
  cursor: pointer;
}

.copy-button:hover {
  background: var(--success-soft);
}

.copy-button:active {
  transform: translateY(1px);
}

.invite-panel p {
  display: none;
  grid-column: 1 / -1;
  margin: 2px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.prepare {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
}

.section-inner {
  max-width: var(--content);
  margin: 0 auto;
  padding: 64px 16px;
}

.prepare-list {
  display: grid;
  margin: 32px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.prepare-list li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 3px 10px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.check-number {
  grid-row: 1 / span 2;
  color: var(--action);
  font-size: 12px;
  font-weight: 800;
}

.prepare-list strong {
  line-height: 1.4;
}

.prepare-list li > span:last-child,
.rule-note {
  color: var(--muted);
}

.prepare-list li > span:last-child {
  font-size: 15px;
}

.rule-note {
  margin: 24px 0 0;
  font-size: 14px;
}

.guide-layout {
  max-width: var(--content);
  margin: 0 auto;
  padding: 0 16px;
}

.route-nav {
  display: none;
}

.step {
  display: grid;
  gap: 28px;
  padding: 72px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 74px;
}

.step-progress {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 6px;
  align-items: center;
}

.step-progress i,
.step-progress span {
  height: 4px;
  border-radius: 2px;
  background: var(--line);
}

.step-progress span {
  display: grid;
  height: 26px;
  place-items: center;
  background: var(--action);
  color: white;
  font-family: Consolas, "SFMono-Regular", monospace;
  font-size: 11px;
  font-style: normal;
}

.step-copy {
  min-width: 0;
  align-self: center;
}

.step-meta {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  color: var(--action);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.step-meta span:last-child {
  color: var(--muted);
}

.step-goal {
  max-width: 610px;
  margin-bottom: 16px;
  color: var(--ink);
  font-size: 17px;
  font-weight: 700;
}

.step-description {
  max-width: 610px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 16px;
}

.tip,
.warning {
  margin-top: 24px;
  padding: 15px 16px;
  border-left: 3px solid var(--action);
  background: var(--info-soft);
  color: var(--muted);
}

.tip strong,
.warning strong {
  display: block;
  margin-bottom: 3px;
  color: var(--ink);
}

.warning {
  border-left-color: var(--warning);
  background: var(--warning-soft);
}

.warning strong {
  color: var(--warning);
}

.step-media {
  display: grid;
  width: 100%;
  max-width: 460px;
  aspect-ratio: 3 / 4;
  padding: 0;
  overflow: hidden;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  cursor: zoom-in;
}

.step-media:hover {
  border-color: color-mix(in srgb, var(--action) 48%, var(--line));
}

.step-media:active {
  transform: translateY(1px);
}

.step-media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.faq {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.faq-grid {
  display: grid;
  gap: 34px;
}

.faq-list {
  border-top: 1px solid var(--line);
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  min-height: 56px;
  padding: 17px 36px 17px 0;
  font-weight: 760;
  cursor: pointer;
}

.faq-list summary:hover {
  color: var(--action-strong);
}

.faq-list p {
  padding: 0 0 20px;
  color: var(--muted);
}

.final-cta {
  max-width: 880px;
  margin: 0 auto;
  padding: 80px 16px;
  text-align: center;
}

.final-cta .benefit-copy {
  margin-right: auto;
  margin-left: auto;
}

.final-actions {
  justify-content: center;
}

.final-actions span {
  width: 100%;
  color: var(--muted);
  font-size: 14px;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px max(16px, calc((100vw - var(--content)) / 2));
  border-top: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
  font-size: 14px;
}

.mobile-cta {
  position: fixed;
  z-index: 25;
  right: 12px;
  bottom: calc(12px + env(safe-area-inset-bottom));
  left: 12px;
  padding: 12px 18px;
  background: var(--action);
  color: white;
  box-shadow: 0 12px 28px rgb(24 33 30 / 20%);
}

.lightbox {
  width: min(92vw, 960px);
  max-height: 92vh;
  padding: 52px 18px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  box-shadow: 0 24px 64px rgb(24 33 30 / 24%);
}

.lightbox::backdrop {
  background: rgb(24 33 30 / 80%);
}

.lightbox img {
  max-height: calc(88vh - 104px);
  margin: 0 auto;
  object-fit: contain;
}

.lightbox p {
  margin: 12px 0 0;
  text-align: center;
}

.lightbox-close {
  position: absolute;
  top: 8px;
  right: 8px;
  display: grid;
  width: 44px;
  aspect-ratio: 1;
  place-items: center;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: var(--ink);
  font-size: 28px;
  cursor: pointer;
}

.lightbox-close:hover {
  background: var(--page);
}

.noscript {
  margin: 0;
  padding: 12px 16px calc(82px + env(safe-area-inset-bottom));
  background: var(--info-soft);
  text-align: center;
}

@media (min-width: 768px) {
  body {
    font-size: 17px;
  }

  h1 {
    font-size: 46px;
  }

  h2 {
    font-size: 44px;
  }

  .step h2 {
    font-size: 36px;
  }

  .site-header {
    grid-template-columns: 1fr auto auto;
    gap: 24px;
    padding-right: max(24px, calc((100vw - var(--content)) / 2));
    padding-left: max(24px, calc((100vw - var(--content)) / 2));
  }

  .duration {
    display: inline;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
    gap: 32px;
    align-items: center;
    min-height: min(680px, calc(100svh - 64px));
    padding: 68px 24px 72px;
  }

  .invite-panel {
    display: block;
    justify-self: end;
    margin-top: 0;
    padding: 26px;
  }

  .invite-label {
    margin-bottom: 10px;
  }

  .invite-code {
    margin-bottom: 20px;
    font-size: 44px;
  }

  .invite-panel p {
    display: block;
    margin: 18px 0 0;
    padding-top: 16px;
  }

  .quick-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .quick-steps li {
    grid-template-columns: 1fr;
    align-content: center;
    gap: 2px;
    min-height: 52px;
    padding: 10px 8px;
    font-size: 14px;
  }

  .quick-steps span {
    font-size: 12px;
  }

  .section-inner {
    padding: 80px 24px;
  }

  .prepare-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .prepare-list li:nth-child(odd) {
    padding-right: 24px;
  }

  .prepare-list li:nth-child(even) {
    padding-left: 24px;
    border-left: 1px solid var(--line);
  }

  .guide-layout {
    padding: 0 24px;
  }

  .step {
    grid-template-columns: minmax(0, 1fr) minmax(300px, 400px);
    column-gap: 40px;
    padding: 96px 0;
  }

  .step-progress {
    grid-column: 1 / -1;
  }

  .step-media {
    justify-self: end;
  }

  .step-description {
    font-size: 17px;
  }

  .faq-grid {
    grid-template-columns: minmax(230px, .72fr) minmax(0, 1.28fr);
  }

  .final-cta {
    padding: 104px 24px;
  }

  .mobile-cta {
    display: none;
  }
}

@media (min-width: 1200px) {
  h1 {
    font-size: 64px;
  }

  .hero {
    grid-template-columns: minmax(0, 1.5fr) minmax(310px, .5fr);
    gap: 72px;
    padding-right: 0;
    padding-left: 0;
  }

  .prepare-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .prepare-list li,
  .prepare-list li:nth-child(odd),
  .prepare-list li:nth-child(even) {
    padding-right: 24px;
    padding-left: 24px;
    border-left: 1px solid var(--line);
  }

  .prepare-list li:first-child {
    padding-left: 0;
    border-left: 0;
  }

  .prepare-list li:last-child {
    padding-right: 0;
  }

  .guide-layout {
    display: grid;
    grid-template-columns: var(--step-track) minmax(0, 1fr);
    gap: 64px;
    padding: 0;
  }

  .route-nav {
    position: sticky;
    top: 96px;
    display: block;
    align-self: start;
    padding-top: 96px;
  }

  .route-label {
    display: block;
    margin-bottom: 18px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
  }

  .route-nav ol {
    margin: 0;
    padding: 0;
    border-left: 1px solid var(--line);
    list-style: none;
  }

  .route-nav a {
    display: grid;
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 8px;
    min-height: 44px;
    align-items: center;
    padding: 8px 0 8px 14px;
    color: var(--muted);
    font-size: 14px;
    text-decoration: none;
  }

  .route-nav a span {
    font-size: 11px;
  }

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

  .route-nav a[aria-current] {
    margin-left: -2px;
    border-left: 3px solid var(--action);
    background: var(--success-soft);
    color: var(--ink);
    font-weight: 760;
  }

  .step {
    grid-template-columns: minmax(0, 1fr) minmax(380px, 460px);
    column-gap: 72px;
    padding: 112px 0;
  }
}

@media (max-width: 767px) {
  body {
    padding-bottom: calc(80px + env(safe-area-inset-bottom));
  }

  .site-header {
    padding-right: 14px;
    padding-left: 14px;
  }

  .brand {
    font-size: 15px;
  }

  .header-cta {
    display: none;
  }

  .hero br {
    display: inline;
  }

  .step-media {
    justify-self: center;
  }

  footer {
    padding-bottom: 28px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media print {
  body {
    padding: 0;
    background: white;
    color: black;
  }

  .site-header,
  .route-nav,
  .mobile-cta,
  .copy-button,
  .hero-actions,
  .step-progress,
  .lightbox,
  footer {
    display: none !important;
  }

  .hero,
  .section-inner,
  .guide-layout,
  .final-cta {
    max-width: none;
    min-height: 0;
    padding: 24px 0;
  }

  .step {
    break-inside: avoid;
    grid-template-columns: 1fr 260px;
    padding: 28px 0;
  }

  .step-media {
    aspect-ratio: auto;
    border: 0;
    pointer-events: none;
  }

  .step-media img {
    width: 240px;
    height: auto;
  }
}