:root {
  --ink: #141414;
  --paper: #ffffff;
  --soft: #f3f4ef;
  --orange: #ff6b35;
  --yellow: #ffd166;
  --mint: #22c7a9;
  --blue: #2f6fed;
  --muted: #626262;
  --line: 2px solid var(--ink);
  --radius: 6px;
  --shadow: 5px 5px 0 var(--ink);
}

* {
  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%;
  height: auto;
}

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

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

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

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 1000;
  padding: 8px 12px;
  color: #fff;
  background: var(--ink);
  transform: translateY(-150%);
}

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

.container {
  width: min(1160px, calc(100% - 40px));
  margin-inline: auto;
}

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

.nav-wrap {
  display: flex;
  min-height: 72px;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  font-size: 21px;
  font-weight: 900;
}

.brand img {
  width: 46px;
  height: 46px;
  border: 2px solid var(--ink);
  border-radius: 10px;
}

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

.site-nav a {
  padding: 8px 12px;
  font-size: 15px;
  font-weight: 700;
  border-bottom: 3px solid transparent;
}

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

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  margin-left: auto;
  padding: 9px;
  background: var(--yellow);
  border: var(--line);
  border-radius: var(--radius);
}

.menu-toggle span {
  display: block;
  height: 3px;
  margin: 5px 0;
  background: var(--ink);
}

.button {
  display: inline-flex;
  min-height: 46px;
  padding: 10px 22px;
  align-items: center;
  justify-content: center;
  color: var(--ink);
  background: var(--orange);
  border: var(--line);
  border-radius: var(--radius);
  box-shadow: 4px 4px 0 var(--ink);
  font-weight: 900;
  line-height: 1.2;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

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

.button-light {
  background: #fff;
}

.button-dark {
  color: #fff;
  background: var(--ink);
  border-color: #fff;
  box-shadow: 4px 4px 0 #fff;
}

.nav-download {
  margin-left: 8px;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 16px;
  padding: 4px 10px;
  background: #fff;
  border: var(--line);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 900;
}

.hero {
  overflow: hidden;
  background: var(--yellow);
  border-bottom: 4px solid var(--ink);
}

.hero-grid {
  display: grid;
  min-height: 600px;
  padding-block: 58px 48px;
  align-items: center;
  grid-template-columns: minmax(0, 1fr) minmax(390px, 0.8fr);
  gap: 48px;
}

.hero-copy {
  position: relative;
  z-index: 2;
}

.hero h1 {
  max-width: 700px;
  margin: 0 0 18px;
  font-size: clamp(40px, 6vw, 76px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-lead {
  max-width: 650px;
  margin: 0 0 26px;
  font-size: 19px;
  font-weight: 700;
}

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

.hero-note {
  margin: 16px 0 0;
  color: #383838;
  font-size: 13px;
}

.hero-art {
  position: relative;
  min-height: 485px;
}

.hero-art::before {
  position: absolute;
  inset: 40px 25px 15px 70px;
  content: "";
  background: var(--mint);
  border: 3px solid var(--ink);
  transform: rotate(5deg);
}

.hero-shot {
  position: absolute;
  width: min(270px, 70%);
  max-width: 400px;
  border: 4px solid var(--ink);
  border-radius: 22px;
  box-shadow: 10px 10px 0 var(--ink);
}

.hero-shot.front {
  right: 24px;
  bottom: 0;
  z-index: 2;
  transform: rotate(3deg);
}

.hero-shot.back {
  top: 0;
  left: 12px;
  width: min(245px, 64%);
  transform: rotate(-7deg);
}

.burst-label {
  position: absolute;
  top: 38px;
  right: 0;
  z-index: 4;
  width: 104px;
  padding: 20px 10px;
  text-align: center;
  background: #fff;
  border: 3px solid var(--ink);
  border-radius: 50%;
  box-shadow: 5px 5px 0 var(--ink);
  font-size: 15px;
  font-weight: 900;
  line-height: 1.35;
  transform: rotate(8deg);
}

.trust-strip {
  color: #fff;
  background: var(--ink);
}

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

.trust-item {
  padding: 24px 18px;
  text-align: center;
  border-right: 1px solid #555;
}

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

.trust-item strong {
  display: block;
  color: var(--yellow);
  font-size: 25px;
  line-height: 1.2;
}

.trust-item span {
  color: #d7d7d7;
  font-size: 13px;
}

.section {
  padding-block: 82px;
}

.section-soft {
  background: var(--soft);
  border-block: var(--line);
}

.section-mint {
  background: var(--mint);
  border-block: var(--line);
}

.section-head {
  display: flex;
  margin-bottom: 32px;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
}

.section h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.18;
  letter-spacing: 0;
}

.section-index {
  min-width: 64px;
  color: var(--orange);
  font-size: 16px;
  font-weight: 900;
}

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

.feature-card {
  min-height: 238px;
  padding: 25px;
  background: #fff;
  border: var(--line);
  border-radius: var(--radius);
}

.feature-card:nth-child(2) {
  background: var(--yellow);
}

.feature-card:nth-child(5) {
  color: #fff;
  background: var(--blue);
}

.feature-number {
  display: inline-grid;
  width: 42px;
  height: 42px;
  place-items: center;
  background: var(--orange);
  border: var(--line);
  border-radius: 50%;
  font-weight: 900;
}

.feature-card h3 {
  margin: 18px 0 8px;
  font-size: 21px;
}

.feature-card p {
  margin: 0;
  font-size: 15px;
}

.shot-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.shot-item {
  margin: 0;
}

.shot-item img {
  width: 100%;
  max-width: 400px;
  aspect-ratio: 3 / 5;
  object-fit: cover;
  border: 3px solid var(--ink);
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.shot-item:nth-child(even) img {
  margin-top: 28px;
}

.shot-item figcaption {
  margin-top: 14px;
  font-size: 14px;
  font-weight: 800;
}

.path-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 20px;
}

.path-link {
  display: flex;
  min-height: 270px;
  padding: 30px;
  flex-direction: column;
  justify-content: space-between;
  background: #fff;
  border: 3px solid var(--ink);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.path-link:first-child {
  background: var(--yellow);
}

.path-link:hover .path-arrow {
  transform: translateX(8px);
}

.path-link h3 {
  max-width: 500px;
  margin: 0 0 12px;
  font-size: 29px;
  line-height: 1.25;
}

.path-link p {
  max-width: 560px;
  margin: 0;
}

.path-arrow {
  align-self: end;
  font-size: 34px;
  font-weight: 900;
  transition: transform 160ms ease;
}

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

.review {
  margin: 0;
  padding: 24px;
  background: #fff;
  border: var(--line);
  border-radius: var(--radius);
}

.review p {
  margin: 0 0 20px;
  font-size: 16px;
  font-weight: 700;
}

.review footer {
  color: var(--muted);
  font-size: 13px;
}

.faq-preview {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 36px;
}

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

.faq-row {
  padding: 20px 0;
  border-bottom: var(--line);
}

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

.faq-row p {
  margin: 0;
  color: var(--muted);
}

.download-band {
  padding-block: 64px;
  color: #fff;
  background: var(--ink);
}

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

.download-band h2 {
  margin: 0 0 8px;
  color: var(--yellow);
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.2;
}

.download-band p {
  margin: 0;
  color: #d5d5d5;
}

.site-footer {
  color: #d7d7d7;
  background: #080808;
  border-top: 1px solid #333;
}

.footer-grid {
  display: grid;
  padding-block: 44px 26px;
  grid-template-columns: 1fr auto;
  gap: 40px;
}

.footer-brand {
  color: #fff;
}

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

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
}

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

.disclaimer {
  max-width: 820px;
  margin: 20px 0 0;
  color: #9f9f9f;
  font-size: 13px;
}

.copyright {
  padding: 18px 0;
  color: #777;
  border-top: 1px solid #292929;
  font-size: 13px;
}

.page-hero {
  padding-block: 72px 62px;
  background: var(--mint);
  border-bottom: 4px solid var(--ink);
}

.page-hero.guide-hero {
  background: var(--orange);
}

.page-hero h1 {
  max-width: 820px;
  margin: 0 0 16px;
  font-size: clamp(39px, 6vw, 67px);
  line-height: 1.1;
  letter-spacing: 0;
}

.page-hero p {
  max-width: 760px;
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}

.breadcrumbs {
  margin-bottom: 18px;
  font-size: 13px;
  font-weight: 800;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 54px;
}

.article-content h2 {
  margin: 58px 0 20px;
  padding-bottom: 10px;
  font-size: 31px;
  line-height: 1.25;
  border-bottom: 4px solid var(--yellow);
}

.article-content h2:first-child {
  margin-top: 0;
}

.article-content h3 {
  margin: 30px 0 8px;
  font-size: 21px;
}

.article-content p {
  margin: 0 0 16px;
}

.article-content a:not(.button) {
  color: #124aa7;
  font-weight: 800;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.step-list {
  display: grid;
  gap: 18px;
}

.step {
  display: grid;
  padding: 24px;
  background: #fff;
  border: var(--line);
  border-radius: var(--radius);
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 20px;
}

.step-count {
  display: grid;
  width: 58px;
  height: 58px;
  place-items: center;
  background: var(--yellow);
  border: var(--line);
  border-radius: 50%;
  font-size: 22px;
  font-weight: 900;
}

.step h3 {
  margin: 0 0 7px;
}

.step p {
  margin: 0;
}

.notice {
  margin: 24px 0;
  padding: 20px 22px;
  background: #fff4c7;
  border: 2px solid var(--ink);
  border-left: 10px solid var(--orange);
}

.article-shot-pair {
  display: grid;
  margin-block: 28px;
  grid-template-columns: repeat(2, minmax(0, 290px));
  gap: 22px;
}

.article-shot-pair figure {
  margin: 0;
}

.article-shot-pair img {
  width: 100%;
  max-width: 400px;
  border: 3px solid var(--ink);
  border-radius: 12px;
}

.article-shot-pair figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
}

.article-aside {
  position: sticky;
  top: 100px;
  align-self: start;
  padding: 22px;
  background: var(--yellow);
  border: var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.article-aside h2 {
  margin: 0 0 12px;
  font-size: 21px;
}

.article-aside ol {
  margin: 0;
  padding-left: 22px;
}

.article-aside li + li {
  margin-top: 8px;
}

.article-aside .button {
  width: 100%;
  margin-top: 20px;
}

.feature-table {
  width: 100%;
  margin: 22px 0;
  border-collapse: collapse;
  table-layout: fixed;
}

.feature-table th,
.feature-table td {
  padding: 14px;
  text-align: left;
  vertical-align: top;
  overflow-wrap: anywhere;
  border: var(--line);
}

.feature-table th:first-child,
.feature-table td:first-child {
  width: 28%;
}

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

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-list details {
  background: #fff;
  border: var(--line);
  border-radius: var(--radius);
}

.faq-list summary {
  position: relative;
  padding: 19px 52px 19px 20px;
  cursor: pointer;
  list-style: none;
  font-weight: 900;
}

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

.faq-list summary::after {
  position: absolute;
  top: 16px;
  right: 18px;
  content: "+";
  font-size: 24px;
  line-height: 1;
}

.faq-list details[open] summary {
  background: var(--yellow);
  border-bottom: var(--line);
}

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

.faq-answer {
  padding: 18px 20px 20px;
}

.faq-answer p {
  margin: 0;
}

.related-links {
  display: grid;
  margin-top: 26px;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.related-links a {
  padding: 18px;
  background: var(--soft);
  border: var(--line);
  border-radius: var(--radius);
  font-weight: 900;
}

@media (max-width: 900px) {
  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    inset: 72px 0 auto 0;
    display: none;
    padding: 16px 20px 22px;
    flex-direction: column;
    align-items: stretch;
    background: #fff;
    border-bottom: 3px solid var(--ink);
  }

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

  .site-nav a {
    padding: 12px;
  }

  .nav-download {
    margin: 10px 0 0;
  }

  .hero-grid {
    min-height: auto;
    grid-template-columns: 1fr;
  }

  .hero-art {
    width: min(100%, 520px);
    min-height: 460px;
    margin-inline: auto;
  }

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

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

  .shot-item:nth-child(even) img {
    margin-top: 0;
  }

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

  .article-aside {
    position: static;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 28px, 1160px);
  }

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

  .brand {
    font-size: 18px;
  }

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

  .site-nav {
    top: 66px;
  }

  .hero-grid {
    padding-block: 42px 32px;
    gap: 26px;
  }

  .hero h1 {
    font-size: 43px;
  }

  .hero-lead,
  .page-hero p {
    font-size: 16px;
  }

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

  .hero-art {
    min-height: 390px;
  }

  .hero-shot.front {
    right: 8px;
  }

  .burst-label {
    top: 22px;
    width: 90px;
    padding: 15px 8px;
  }

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

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

  .trust-item:nth-child(-n + 2) {
    border-bottom: 1px solid #555;
  }

  .section {
    padding-block: 58px;
  }

  .section-head {
    align-items: start;
    flex-direction: column;
  }

  .feature-grid,
  .review-grid,
  .shot-grid,
  .path-grid,
  .faq-preview,
  .related-links {
    grid-template-columns: 1fr;
  }

  .shot-item img {
    width: min(100%, 300px);
    margin-inline: auto;
  }

  .shot-item figcaption {
    text-align: center;
  }

  .path-link {
    min-height: 230px;
  }

  .download-grid,
  .footer-grid {
    align-items: start;
    flex-direction: column;
    grid-template-columns: 1fr;
  }

  .download-grid {
    display: flex;
  }

  .download-grid .button {
    width: 100%;
  }

  .page-hero {
    padding-block: 52px 44px;
  }

  .page-hero h1 {
    font-size: 40px;
  }

  .step {
    padding: 20px;
    grid-template-columns: 1fr;
  }

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

  .article-shot-pair img {
    width: min(100%, 300px);
  }

  .feature-table {
    font-size: 14px;
  }

  .feature-table th,
  .feature-table td {
    padding: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}