:root {
  --ink: #17151f;
  --paper: #fffaf0;
  --paper-deep: #f1ecdf;
  --white: #ffffff;
  --coral: #ff4d3d;
  --coral-dark: #c92e27;
  --teal: #17bebb;
  --yellow: #ffd166;
  --muted: #67636e;
  --line: 2px solid var(--ink);
  --shadow: 6px 6px 0 var(--ink);
  --max: 1180px;
}

* {
  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: 1.72;
  letter-spacing: 0;
  overflow-x: hidden;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -2;
  content: "";
  opacity: 0.24;
  background-image: radial-gradient(circle, rgba(23, 21, 31, 0.19) 1px, transparent 1.5px);
  background-size: 18px 18px;
  pointer-events: none;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  font: inherit;
}

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

:focus-visible {
  outline: 3px solid var(--teal);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  left: 12px;
  top: -80px;
  z-index: 100;
  padding: 10px 16px;
  background: var(--ink);
  color: var(--white);
}

.skip-link:focus {
  top: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 250, 240, 0.96);
  border-bottom: var(--line);
  backdrop-filter: blur(12px);
}

.nav-shell {
  width: min(calc(100% - 36px), var(--max));
  min-height: 74px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 26px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  font-weight: 900;
  font-size: 20px;
}

.brand img {
  width: 44px;
  height: 44px;
  border: 2px solid var(--ink);
  border-radius: 8px;
}

.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav a {
  min-height: 42px;
  padding: 8px 14px;
  display: inline-flex;
  align-items: center;
  font-weight: 700;
  border-bottom: 3px solid transparent;
}

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

.nav-download,
.download-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 21px;
  color: var(--white);
  background: var(--coral);
  border: 2px solid var(--ink);
  border-radius: 4px;
  box-shadow: 4px 4px 0 var(--ink);
  font-weight: 900;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.nav-download::after,
.download-button::after {
  content: "↓";
  margin-left: 8px;
  font-size: 20px;
  line-height: 1;
}

.nav-download:hover,
.download-button:hover {
  background: var(--coral-dark);
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--ink);
}

.menu-toggle {
  width: 44px;
  height: 44px;
  margin-left: auto;
  display: none;
  place-items: center;
  padding: 0;
  background: var(--paper);
  border: var(--line);
  border-radius: 4px;
  cursor: pointer;
}

.menu-icon,
.menu-icon::before,
.menu-icon::after {
  width: 21px;
  height: 2px;
  display: block;
  background: var(--ink);
  content: "";
}

.menu-icon::before {
  transform: translateY(-7px);
}

.menu-icon::after {
  transform: translateY(5px);
}

.container {
  width: min(calc(100% - 36px), var(--max));
  margin-inline: auto;
}

.hero {
  position: relative;
  min-height: min(720px, calc(100svh - 74px));
  overflow: hidden;
  border-bottom: var(--line);
  background: var(--yellow);
}

.hero::before {
  position: absolute;
  inset: 0;
  content: "";
  background-image: url("../images/brand-forest.webp");
  background-repeat: no-repeat;
  background-position: right bottom;
  background-size: min(74vw, 1020px) auto;
  opacity: 0.2;
  mix-blend-mode: multiply;
}

.hero-shell {
  position: relative;
  z-index: 2;
  min-height: inherit;
  display: flex;
  align-items: center;
  padding-block: 70px 62px;
}

.hero-copy {
  width: min(620px, 58%);
  position: relative;
  z-index: 4;
}

.kicker {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 4px 10px;
  color: var(--white);
  background: var(--ink);
  font-size: 13px;
  font-weight: 900;
}

.kicker::before {
  width: 9px;
  height: 9px;
  margin-right: 8px;
  background: var(--teal);
  border-radius: 50%;
  content: "";
}

.hero h1,
.page-hero h1 {
  max-width: 760px;
  margin: 22px 0 20px;
  font-size: 58px;
  line-height: 1.1;
  font-weight: 950;
  letter-spacing: 0;
}

.hero-lead {
  max-width: 590px;
  margin: 0;
  font-size: 19px;
  line-height: 1.8;
  font-weight: 650;
}

.hero-actions {
  margin-top: 28px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.hero-note {
  font-size: 13px;
  font-weight: 700;
}

.hero-note strong {
  color: var(--coral-dark);
}

.hero-art {
  position: absolute;
  right: -10px;
  bottom: -108px;
  width: 48%;
  height: calc(100% + 78px);
  z-index: 3;
}

.phone-shot {
  position: absolute;
  width: min(255px, 22vw);
  max-width: 340px;
  height: auto;
  border: 4px solid var(--ink);
  border-radius: 8px;
  box-shadow: 10px 10px 0 var(--ink);
  background: var(--ink);
}

.phone-shot:first-child {
  right: 34%;
  top: 76px;
  transform: rotate(-4deg);
}

.phone-shot:nth-child(2) {
  right: 1%;
  top: 22px;
  transform: rotate(4deg);
}

.floating-mark {
  position: absolute;
  right: 46%;
  top: 38px;
  width: 102px;
  height: 102px;
  object-fit: contain;
  filter: drop-shadow(5px 6px 0 rgba(23, 21, 31, 0.9));
}

.status-strip {
  background: var(--ink);
  color: var(--white);
  border-bottom: var(--line);
}

.status-list {
  min-height: 72px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  align-items: center;
}

.status-item {
  min-height: 42px;
  padding: 4px 20px;
  display: flex;
  align-items: center;
  gap: 11px;
  border-right: 1px solid rgba(255, 255, 255, 0.25);
}

.status-item:first-child {
  padding-left: 0;
}

.status-item:last-child {
  border-right: 0;
}

.status-dot {
  width: 11px;
  height: 11px;
  flex: 0 0 auto;
  background: var(--teal);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(23, 190, 187, 0.2);
}

.status-item strong {
  display: block;
  color: var(--yellow);
  font-size: 13px;
}

.status-item span {
  font-size: 13px;
}

.section {
  padding: 92px 0;
  border-bottom: var(--line);
}

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

.section-coral {
  background: var(--coral);
}

.section-paper-deep {
  background: var(--paper-deep);
}

.section-heading {
  margin: 0 0 38px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}

.section-heading h2 {
  max-width: 720px;
  margin: 0;
  font-size: 38px;
  line-height: 1.2;
  font-weight: 950;
}

.issue-number {
  flex: 0 0 auto;
  color: var(--coral);
  font-family: Georgia, serif;
  font-size: 15px;
  font-weight: 800;
}

.section-ink .issue-number {
  color: var(--yellow);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.feature-block {
  min-height: 220px;
  padding: 24px;
  background: var(--white);
  border: var(--line);
  border-radius: 4px;
  box-shadow: var(--shadow);
}

.feature-block:nth-child(2) {
  background: var(--teal);
}

.feature-block:nth-child(3) {
  background: var(--yellow);
}

.feature-index {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  margin-bottom: 32px;
  color: var(--white);
  background: var(--ink);
  border-radius: 50%;
  font-weight: 950;
}

.feature-block h3 {
  margin: 0 0 10px;
  font-size: 20px;
}

.feature-block p {
  margin: 0;
  color: #302d38;
  font-size: 14px;
}

.storyboard {
  display: grid;
  grid-template-columns: minmax(250px, 0.72fr) minmax(0, 1.8fr);
  gap: 46px;
  align-items: start;
}

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

.story-copy h2 {
  margin: 0 0 20px;
  font-size: 38px;
  line-height: 1.2;
}

.story-copy p {
  margin: 0 0 18px;
  color: #d7d2dc;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--yellow);
  font-weight: 900;
  border-bottom: 2px solid currentColor;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.preview-figure {
  margin: 0;
}

.preview-button {
  width: 100%;
  padding: 0;
  display: grid;
  place-items: center;
  overflow: hidden;
  cursor: zoom-in;
  background: #292633;
  border: 2px solid rgba(255, 255, 255, 0.75);
  border-radius: 4px;
}

.preview-button img,
.app-preview {
  width: min(100%, 298px);
  max-width: 340px;
  height: auto;
}

.preview-figure figcaption {
  padding: 13px 4px 0;
  color: #efebf2;
  font-size: 13px;
}

.journey-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: var(--line);
  box-shadow: var(--shadow);
}

.journey-step {
  min-height: 220px;
  padding: 30px;
  background: var(--white);
  border-right: var(--line);
}

.journey-step:last-child {
  border-right: 0;
}

.journey-step strong {
  display: block;
  margin-bottom: 34px;
  color: var(--coral);
  font-size: 14px;
}

.journey-step h3 {
  margin: 0 0 10px;
  font-size: 21px;
}

.journey-step p {
  margin: 0;
  color: var(--muted);
}

.section-action {
  margin-top: 34px;
  display: flex;
  justify-content: flex-end;
}

.section-action .text-link {
  color: var(--ink);
}

.feedback-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr 1fr;
  gap: 18px;
}

.feedback-card {
  margin: 0;
  padding: 28px;
  background: var(--white);
  border: var(--line);
  border-radius: 4px;
}

.feedback-card:first-child {
  background: var(--yellow);
}

.feedback-card blockquote {
  margin: 0 0 22px;
  font-size: 17px;
  font-weight: 750;
}

.feedback-card figcaption {
  font-size: 13px;
  color: var(--muted);
}

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

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

.faq-question {
  width: 100%;
  min-height: 72px;
  padding: 18px 52px 18px 0;
  position: relative;
  color: var(--ink);
  background: transparent;
  border: 0;
  text-align: left;
  font-weight: 900;
  cursor: pointer;
}

.faq-question::after {
  position: absolute;
  right: 4px;
  top: 50%;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  content: "+";
  transform: translateY(-50%);
  color: var(--white);
  background: var(--ink);
  border-radius: 50%;
  font-size: 22px;
}

.faq-question[aria-expanded="true"]::after {
  content: "−";
  background: var(--coral);
}

.faq-answer {
  max-width: 860px;
  padding: 0 52px 22px 0;
  color: #45414b;
}

.faq-answer[hidden] {
  display: none;
}

.page-hero {
  position: relative;
  min-height: 460px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--teal);
  border-bottom: var(--line);
}

.page-hero::after {
  position: absolute;
  right: 2vw;
  bottom: -82px;
  width: min(390px, 34vw);
  height: min(390px, 34vw);
  content: "";
  background: url("../images/brand-mascot.png") center / contain no-repeat;
  opacity: 0.9;
}

.page-hero.coral {
  color: var(--white);
  background: var(--coral);
}

.page-hero-content {
  position: relative;
  z-index: 2;
  max-width: 820px;
  padding: 82px 0;
}

.page-hero h1 {
  font-size: 48px;
}

.page-hero p {
  max-width: 680px;
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}

.breadcrumb {
  margin-bottom: 18px;
  font-size: 13px;
  font-weight: 900;
}

.breadcrumb a {
  border-bottom: 1px solid currentColor;
}

.guide-layout,
.faq-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 54px;
  align-items: start;
}

.toc {
  position: sticky;
  top: 104px;
  padding: 18px;
  background: var(--white);
  border: var(--line);
  box-shadow: 4px 4px 0 var(--ink);
}

.toc strong {
  display: block;
  margin-bottom: 10px;
  font-size: 13px;
}

.toc a {
  display: block;
  padding: 8px 0;
  color: var(--muted);
  font-size: 14px;
  border-bottom: 1px solid #ddd6c8;
}

.toc a:last-child {
  border-bottom: 0;
}

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

.article-section {
  margin-bottom: 66px;
  scroll-margin-top: 110px;
}

.article-section:last-child {
  margin-bottom: 0;
}

.article-section h2 {
  margin: 0 0 24px;
  padding-bottom: 12px;
  font-size: 30px;
  line-height: 1.3;
  border-bottom: var(--line);
}

.article-section h3 {
  margin: 28px 0 8px;
  font-size: 21px;
}

.article-section p {
  margin: 0 0 15px;
  color: #3f3b45;
}

.step-list {
  display: grid;
  gap: 22px;
}

.guide-step {
  padding: 24px;
  display: grid;
  grid-template-columns: 62px 1fr;
  gap: 20px;
  background: var(--white);
  border: var(--line);
  border-radius: 4px;
}

.step-number {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  color: var(--white);
  background: var(--coral);
  border: var(--line);
  border-radius: 50%;
  font-size: 20px;
  font-weight: 950;
}

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

.guide-step p {
  margin: 0;
}

.notice {
  padding: 20px 22px;
  background: var(--yellow);
  border: var(--line);
  box-shadow: 4px 4px 0 var(--ink);
}

.notice strong {
  display: block;
  margin-bottom: 5px;
}

.check-list,
.plain-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding: 11px 0 11px 34px;
  border-bottom: 1px solid #d8d0c3;
}

.check-list li::before {
  position: absolute;
  left: 0;
  top: 12px;
  width: 21px;
  height: 21px;
  display: grid;
  place-items: center;
  color: var(--white);
  background: var(--teal);
  border-radius: 50%;
  content: "✓";
  font-size: 12px;
  font-weight: 900;
}

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

.mode-table th,
.mode-table td {
  padding: 15px;
  border: 1px solid var(--ink);
  text-align: left;
  vertical-align: top;
}

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

.faq-tools {
  margin-bottom: 24px;
}

.faq-search-label {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  font-weight: 900;
}

.faq-search {
  width: 100%;
  min-height: 52px;
  padding: 12px 15px;
  background: var(--white);
  border: var(--line);
  border-radius: 4px;
}

.faq-search:focus {
  outline: 3px solid var(--yellow);
}

.faq-empty {
  padding: 24px;
  background: var(--yellow);
  border: var(--line);
}

.inline-link {
  color: var(--coral-dark);
  font-weight: 900;
  border-bottom: 1px solid currentColor;
}

.bottom-download {
  padding: 58px 0;
  color: var(--white);
  background: var(--coral);
  border-bottom: var(--line);
}

.bottom-download-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.bottom-download h2 {
  max-width: 760px;
  margin: 0;
  font-size: 32px;
  line-height: 1.25;
}

.bottom-download .download-button {
  flex: 0 0 auto;
  color: var(--ink);
  background: var(--yellow);
}

.site-footer {
  padding: 48px 0 30px;
  color: #d8d4dc;
  background: var(--ink);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr;
  gap: 40px;
}

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

.footer-brand p {
  max-width: 520px;
  margin: 16px 0 0;
  font-size: 13px;
}

.footer-links strong {
  display: block;
  margin-bottom: 10px;
  color: var(--yellow);
  font-size: 13px;
}

.footer-links a {
  display: block;
  width: fit-content;
  padding: 5px 0;
  font-size: 13px;
}

.footer-links a:hover {
  color: var(--white);
}

.footer-bottom {
  margin-top: 36px;
  padding-top: 22px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid #4a4652;
  font-size: 12px;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  padding: 24px;
  display: none;
  place-items: center;
  background: rgba(23, 21, 31, 0.92);
}

.lightbox.is-open {
  display: grid;
}

.lightbox img {
  width: auto;
  max-width: min(400px, 86vw);
  max-height: 84vh;
  border: 3px solid var(--white);
  border-radius: 4px;
}

.lightbox-close {
  position: fixed;
  right: 24px;
  top: 24px;
  width: 46px;
  height: 46px;
  padding: 0;
  color: var(--ink);
  background: var(--yellow);
  border: var(--line);
  border-radius: 50%;
  font-size: 28px;
  cursor: pointer;
}

@media (max-width: 980px) {
  .nav-download {
    display: none;
  }

  .hero h1 {
    font-size: 48px;
  }

  .hero-copy {
    width: 62%;
  }

  .hero-art {
    width: 48%;
  }

  .phone-shot {
    width: 220px;
  }

  .phone-shot:first-child {
    display: none;
  }

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

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

  .story-copy {
    position: static;
  }
}

@media (max-width: 760px) {
  .nav-shell {
    width: min(calc(100% - 28px), var(--max));
    min-height: 66px;
  }

  .brand {
    font-size: 18px;
  }

  .brand img {
    width: 40px;
    height: 40px;
  }

  .menu-toggle {
    display: grid;
  }

  .site-nav {
    position: absolute;
    left: 14px;
    right: 14px;
    top: 66px;
    display: none;
    padding: 10px;
    flex-direction: column;
    align-items: stretch;
    background: var(--paper);
    border: var(--line);
    box-shadow: 5px 5px 0 var(--ink);
  }

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

  .site-nav a {
    border-bottom: 1px solid #d8d0c3;
  }

  .container {
    width: min(calc(100% - 28px), var(--max));
  }

  .hero {
    min-height: min(690px, calc(100svh - 66px));
  }

  .hero-shell {
    align-items: flex-start;
    padding-block: 54px 28px;
  }

  .hero-copy {
    width: 100%;
    max-width: 530px;
  }

  .hero h1,
  .page-hero h1 {
    font-size: 38px;
  }

  .hero-lead {
    max-width: 84%;
    font-size: 16px;
  }

  .hero-art {
    right: -52px;
    bottom: -295px;
    width: 205px;
    height: 500px;
    opacity: 0.38;
  }

  .phone-shot:nth-child(2) {
    width: 178px;
    right: 0;
    top: 0;
    transform: rotate(5deg);
  }

  .floating-mark {
    display: none;
  }

  .status-list {
    grid-template-columns: repeat(2, 1fr);
    padding-block: 10px;
  }

  .status-item,
  .status-item:first-child {
    padding: 8px 10px;
    border-right: 0;
  }

  .section {
    padding: 68px 0;
  }

  .section-heading {
    align-items: flex-start;
  }

  .section-heading h2,
  .story-copy h2 {
    font-size: 30px;
  }

  .feature-grid,
  .journey-grid,
  .feedback-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .feature-block {
    min-height: 190px;
  }

  .journey-step {
    min-height: 0;
    border-right: 0;
    border-bottom: var(--line);
  }

  .journey-step:last-child {
    border-bottom: 0;
  }

  .guide-layout,
  .faq-layout {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .toc {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0 16px;
  }

  .toc strong {
    grid-column: 1 / -1;
  }

  .bottom-download-shell {
    align-items: flex-start;
    flex-direction: column;
  }

  .footer-bottom {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .hero h1,
  .page-hero h1 {
    font-size: 34px;
  }

  .hero-lead {
    max-width: 96%;
  }

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

  .preview-button img {
    width: min(100%, 284px);
  }

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

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

  .mode-table,
  .mode-table tbody,
  .mode-table tr,
  .mode-table th,
  .mode-table td {
    display: block;
    width: 100%;
  }

  .mode-table tr {
    border-bottom: var(--line);
  }

  .mode-table tr:last-child {
    border-bottom: 0;
  }

  .mode-table th,
  .mode-table td {
    border-width: 0 0 1px;
  }
}

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

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