:root {
  --paper: #fffaf5;
  --paper-warm: #fff1e8;
  --ink: #24202b;
  --muted: #6e6772;
  --coral: #f05a6e;
  --coral-dark: #c93750;
  --orange: #ff9a62;
  --mint: #2f7f74;
  --mint-pale: #dff3ed;
  --line: #ded6d3;
  --white: #ffffff;
  --shadow: 0 18px 48px rgba(36, 32, 43, 0.12);
  --page: 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: 1.75;
  letter-spacing: 0;
}

body.nav-open {
  overflow: hidden;
}

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

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

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

button,
input {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 8px 12px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-150%);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: 72px;
  border-bottom: 1px solid rgba(36, 32, 43, 0.12);
  background: rgba(255, 250, 245, 0.96);
  backdrop-filter: blur(12px);
}

.nav-shell {
  width: min(calc(100% - 40px), var(--page));
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  font-weight: 900;
  font-size: 20px;
  line-height: 1;
}

.brand img {
  width: 42px;
  height: 42px;
  border: 2px solid var(--ink);
  border-radius: 8px;
  box-shadow: 3px 3px 0 var(--ink);
}

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

.site-nav a:not(.button) {
  padding: 8px 14px;
  border-bottom: 2px solid transparent;
  color: #514a54;
  font-size: 15px;
  font-weight: 700;
}

.site-nav a:not(.button):hover,
.site-nav a[aria-current="page"]:not(.button) {
  color: var(--coral-dark);
  border-bottom-color: var(--coral);
}

.button {
  min-height: 46px;
  padding: 10px 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--ink);
  border-radius: 5px;
  background: var(--coral);
  color: var(--white);
  box-shadow: 5px 5px 0 var(--ink);
  font-weight: 900;
  line-height: 1;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover,
.button:focus-visible {
  background: var(--coral-dark);
  box-shadow: 2px 2px 0 var(--ink);
  transform: translate(3px, 3px);
}

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

.button-light:hover,
.button-light:focus-visible {
  background: var(--mint-pale);
}

.nav-toggle {
  width: 44px;
  height: 44px;
  display: none;
  place-items: center;
  padding: 0;
  border: 2px solid var(--ink);
  border-radius: 5px;
  background: var(--paper);
  cursor: pointer;
}

.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  width: 20px;
  height: 2px;
  display: block;
  background: var(--ink);
  content: "";
  transition: transform 160ms ease;
}

.nav-toggle span::before {
  transform: translateY(-6px);
}

.nav-toggle span::after {
  transform: translateY(4px);
}

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

.hero {
  min-height: 640px;
  overflow: hidden;
  border-bottom: 2px solid var(--ink);
  background: var(--paper-warm);
}

.hero-grid {
  min-height: 640px;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(340px, 0.95fr);
  align-items: center;
  gap: 70px;
  padding: 56px 0 64px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--mint);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "//";
  margin-right: 8px;
  color: var(--coral);
}

h1,
h2,
h3 {
  margin-top: 0;
  letter-spacing: 0;
  line-height: 1.2;
}

h1 {
  max-width: 720px;
  margin-bottom: 22px;
  font-size: clamp(44px, 7vw, 82px);
  font-weight: 950;
}

h2 {
  margin-bottom: 30px;
  font-size: clamp(30px, 4vw, 48px);
  font-weight: 950;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
  font-weight: 900;
}

.hero-copy > p:first-of-type {
  max-width: 690px;
  margin: 0;
  color: #4f4851;
  font-size: 18px;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 30px;
}

.hero-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 24px 0 0;
  padding: 0;
  color: var(--muted);
  font-size: 14px;
  list-style: none;
}

.hero-notes li::before {
  content: "✓";
  margin-right: 7px;
  color: var(--mint);
  font-weight: 900;
}

.hero-art {
  position: relative;
  min-height: 510px;
  display: grid;
  place-items: center;
}

.hero-art::before,
.hero-art::after {
  position: absolute;
  z-index: 0;
  border: 2px solid var(--ink);
  content: "";
}

.hero-art::before {
  width: 340px;
  height: 420px;
  background: var(--orange);
  transform: rotate(6deg) translate(20px, 2px);
}

.hero-art::after {
  width: 320px;
  height: 410px;
  background: var(--mint-pale);
  transform: rotate(-5deg) translate(-20px, 18px);
}

.hero-phone {
  position: relative;
  z-index: 2;
  width: min(294px, 72vw);
  max-width: 400px;
  border: 8px solid var(--ink);
  border-radius: 28px;
  box-shadow: 16px 18px 0 rgba(36, 32, 43, 0.16);
}

.sound-effect {
  position: absolute;
  z-index: 3;
  right: 0;
  bottom: 50px;
  padding: 8px 14px;
  border: 2px solid var(--ink);
  background: var(--white);
  box-shadow: 4px 4px 0 var(--ink);
  color: var(--coral-dark);
  font-size: 18px;
  font-weight: 950;
  transform: rotate(-4deg);
}

.status-strip {
  border-bottom: 2px solid var(--ink);
  background: var(--ink);
  color: var(--white);
}

.status-list {
  min-height: 58px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0;
  padding: 0;
  list-style: none;
}

.status-list li {
  display: grid;
  place-items: center;
  border-right: 1px solid rgba(255, 255, 255, 0.2);
  font-size: 14px;
  font-weight: 800;
}

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

.section {
  padding: 92px 0;
}

.section-tight {
  padding: 68px 0;
}

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

.section-mint {
  background: var(--mint-pale);
}

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

.section-head {
  max-width: 780px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 2px solid var(--ink);
  border-left: 2px solid var(--ink);
}

.feature-item {
  min-height: 245px;
  padding: 30px 24px;
  border-right: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  background: var(--white);
}

.feature-number {
  display: block;
  margin-bottom: 34px;
  color: var(--coral);
  font-size: 14px;
  font-weight: 950;
}

.feature-item p,
.route-copy p,
.guide-step p,
.info-panel p,
.review blockquote {
  margin: 0;
  color: var(--muted);
}

.route-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(0, 1.25fr);
  gap: 70px;
  align-items: start;
}

.route-list {
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--ink);
  list-style: none;
  counter-reset: route;
}

.route-list li {
  position: relative;
  padding: 25px 20px 25px 74px;
  border-bottom: 2px solid var(--ink);
  counter-increment: route;
}

.route-list li::before {
  position: absolute;
  top: 23px;
  left: 18px;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--orange);
  content: counter(route);
  font-weight: 950;
}

.route-list strong {
  display: block;
  margin-bottom: 5px;
  font-size: 18px;
}

.route-list span {
  color: var(--muted);
}

.gallery-tools {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.gallery-tools h2 {
  margin-bottom: 0;
}

.gallery-controls {
  display: flex;
  gap: 8px;
}

.icon-button {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 2px solid currentColor;
  border-radius: 5px;
  background: transparent;
  color: inherit;
  font-size: 22px;
  cursor: pointer;
}

.icon-button:hover,
.icon-button:focus-visible {
  background: var(--coral);
  color: var(--white);
}

.shot-track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(250px, 294px);
  gap: 22px;
  overflow-x: auto;
  padding: 8px 4px 28px;
  scroll-behavior: smooth;
  scroll-snap-type: x mandatory;
  scrollbar-color: var(--coral) rgba(255, 255, 255, 0.2);
}

.shot-item {
  margin: 0;
  scroll-snap-align: start;
}

.shot-item img,
.inline-shot {
  width: 100%;
  max-width: 400px;
  height: auto;
  border: 3px solid currentColor;
  border-radius: 18px;
  background: var(--white);
}

.shot-item figcaption {
  padding: 14px 3px 0;
  color: #cbc4cd;
  font-size: 14px;
}

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

.deep-link {
  min-height: 270px;
  display: flex;
  flex-direction: column;
  padding: 34px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--white);
  box-shadow: 8px 8px 0 var(--ink);
}

.deep-link:nth-child(2) {
  background: var(--mint-pale);
}

.deep-link p {
  margin: 0 0 26px;
  color: var(--muted);
}

.text-link {
  margin-top: auto;
  color: var(--coral-dark);
  font-weight: 900;
}

.text-link::after {
  content: " →";
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.review {
  min-height: 230px;
  padding: 30px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.review-stars {
  margin-bottom: 20px;
  color: var(--orange);
  font-weight: 900;
}

.review cite {
  display: block;
  margin-top: 22px;
  color: var(--ink);
  font-size: 14px;
  font-style: normal;
  font-weight: 900;
}

.faq-preview,
.faq-list {
  max-width: 900px;
  border-top: 2px solid var(--ink);
}

details {
  border-bottom: 2px solid var(--ink);
}

summary {
  position: relative;
  padding: 22px 52px 22px 0;
  font-size: 18px;
  font-weight: 900;
  list-style: none;
  cursor: pointer;
}

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

summary::after {
  position: absolute;
  top: 19px;
  right: 4px;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 50%;
  content: "+";
}

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

details > div {
  padding: 0 56px 24px 0;
  color: var(--muted);
}

details p {
  margin: 0 0 12px;
}

.download-band {
  padding: 58px 0;
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  background: var(--coral);
}

.download-band .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.download-band h2 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(28px, 4vw, 46px);
}

.site-footer {
  padding: 48px 0 30px;
  color: #d9d3dc;
  background: var(--ink);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
  align-items: start;
}

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

.footer-copy {
  max-width: 680px;
  margin: 20px 0 0;
  font-size: 14px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 12px 24px;
  font-weight: 800;
}

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

.footer-bottom {
  margin-top: 36px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  font-size: 13px;
}

.footer-bottom p {
  margin: 5px 0;
}

.subhero {
  padding: 72px 0 64px;
  border-bottom: 2px solid var(--ink);
  background: var(--paper-warm);
}

.subhero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  align-items: center;
  gap: 56px;
}

.subhero h1 {
  margin-bottom: 20px;
  font-size: clamp(38px, 6vw, 66px);
}

.subhero p {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: 18px;
}

.subhero-mark {
  min-height: 250px;
  display: grid;
  place-items: center;
  border: 2px solid var(--ink);
  background: var(--mint-pale);
  box-shadow: 12px 12px 0 var(--ink);
  color: var(--coral-dark);
  font-size: 76px;
  font-weight: 950;
}

.guide-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.68fr) minmax(0, 1.32fr);
  gap: 64px;
  align-items: start;
}

.guide-aside {
  position: sticky;
  top: 104px;
}

.guide-aside nav {
  border-top: 2px solid var(--ink);
}

.guide-aside a {
  display: block;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-weight: 800;
}

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

.guide-steps {
  display: grid;
  gap: 46px;
}

.guide-step {
  scroll-margin-top: 100px;
}

.step-kicker {
  display: inline-block;
  margin-bottom: 16px;
  padding: 4px 10px;
  border: 2px solid var(--ink);
  background: var(--orange);
  font-size: 13px;
  font-weight: 950;
}

.guide-step h2 {
  margin-bottom: 18px;
  font-size: 34px;
}

.guide-step p + p {
  margin-top: 13px;
}

.guide-visual {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 294px);
  gap: 30px;
  align-items: center;
  margin-top: 24px;
  padding: 28px;
  border: 2px solid var(--ink);
  background: var(--white);
}

.check-list,
.plain-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li,
.plain-list li {
  position: relative;
  padding: 8px 0 8px 28px;
}

.check-list li::before {
  position: absolute;
  left: 0;
  color: var(--mint);
  content: "✓";
  font-weight: 950;
}

.plain-list li::before {
  position: absolute;
  left: 2px;
  color: var(--coral);
  content: "•";
  font-weight: 950;
}

.notice {
  margin-top: 22px;
  padding: 18px 20px;
  border-left: 5px solid var(--coral);
  background: var(--paper-warm);
  color: #554e56;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 2px solid var(--ink);
  border-left: 2px solid var(--ink);
}

.info-panel {
  min-height: 230px;
  padding: 28px;
  border-right: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  background: var(--white);
}

.feature-detail {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(230px, 294px);
  gap: 54px;
  align-items: center;
  padding: 54px 0;
  border-bottom: 1px solid var(--line);
}

.feature-detail:nth-child(even) .feature-detail-copy {
  order: 2;
}

.feature-detail:nth-child(even) .feature-detail-media {
  order: 1;
}

.feature-detail h2 {
  margin-bottom: 16px;
  font-size: 34px;
}

.feature-detail p {
  margin: 0 0 14px;
  color: var(--muted);
}

.feature-detail-media img {
  width: 294px;
  max-width: 400px;
  height: auto;
  margin: 0 auto;
  border: 3px solid var(--ink);
  border-radius: 18px;
}

.topic-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 38px;
}

.topic-nav a {
  padding: 7px 12px;
  border: 1px solid var(--ink);
  border-radius: 4px;
  background: var(--white);
  font-size: 14px;
  font-weight: 800;
}

.topic-nav a:hover {
  background: var(--mint-pale);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 500ms ease, transform 500ms ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

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

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

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

  .site-nav {
    position: fixed;
    inset: 72px 0 auto 0;
    display: none;
    align-items: stretch;
    padding: 18px 20px 24px;
    border-bottom: 2px solid var(--ink);
    background: var(--paper);
    box-shadow: var(--shadow);
  }

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

  .site-nav a:not(.button) {
    min-height: 48px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--line);
  }

  .hero-grid,
  .subhero-grid,
  .route-grid,
  .guide-layout {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    gap: 24px;
    padding-top: 46px;
  }

  .hero-art {
    min-height: 470px;
  }

  .subhero-mark {
    min-height: 170px;
  }

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

  .guide-aside {
    position: static;
  }

  .guide-aside nav {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }

  .guide-aside a {
    padding-right: 12px;
  }

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

@media (max-width: 680px) {
  .nav-shell,
  .container {
    width: min(calc(100% - 28px), var(--page));
  }

  .brand {
    font-size: 18px;
  }

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

  .hero {
    min-height: 0;
  }

  .hero-grid {
    position: relative;
    min-height: 550px;
    height: calc(100svh - 112px);
    max-height: 640px;
    display: block;
    padding: 24px 0 16px;
  }

  h1 {
    margin-bottom: 12px;
    font-size: 40px;
  }

  h2 {
    font-size: 32px;
  }

  .hero-copy > p:first-of-type,
  .subhero p {
    font-size: 14px;
    line-height: 1.68;
  }

  .hero .eyebrow {
    margin-bottom: 6px;
  }

  .hero-actions {
    gap: 8px;
    margin-top: 14px;
  }

  .hero-actions .button {
    min-width: 0;
    min-height: 42px;
    flex: 1 1 0;
    padding: 9px 10px;
  }

  .hero-notes {
    display: none;
  }

  .hero-art {
    position: absolute;
    right: 0;
    bottom: 8px;
    width: 100%;
    min-height: 0;
    height: 220px;
  }

  .hero-art::before {
    width: 152px;
    height: 174px;
    transform: rotate(6deg) translate(15px, 3px);
  }

  .hero-art::after {
    width: 146px;
    height: 168px;
    transform: rotate(-5deg) translate(-16px, 8px);
  }

  .hero-phone {
    width: 126px;
    border-width: 4px;
    border-radius: 15px;
    box-shadow: 8px 9px 0 rgba(36, 32, 43, 0.16);
  }

  .sound-effect {
    right: calc(50% - 112px);
    bottom: 22px;
    padding: 4px 8px;
    font-size: 12px;
  }

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

  .status-list li {
    min-height: 48px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  }

  .section {
    padding: 66px 0;
  }

  .feature-grid,
  .deep-grid,
  .review-grid,
  .footer-grid,
  .guide-visual,
  .feature-detail {
    grid-template-columns: 1fr;
  }

  .feature-item {
    min-height: 210px;
  }

  .gallery-tools {
    align-items: start;
  }

  .shot-track {
    grid-auto-columns: minmax(238px, 80vw);
  }

  .download-band .container {
    align-items: stretch;
    flex-direction: column;
  }

  .footer-links {
    justify-content: flex-start;
  }

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

  .guide-step h2,
  .feature-detail h2 {
    font-size: 28px;
  }

  .feature-detail:nth-child(even) .feature-detail-copy,
  .feature-detail:nth-child(even) .feature-detail-media {
    order: initial;
  }

  .feature-detail {
    gap: 28px;
  }
}