:root {
  --ink: #102a2a;
  --ink-soft: #365050;
  --paper: #f5fff9;
  --white: #ffffff;
  --mint: #27e0a3;
  --mint-dark: #0d9d73;
  --red: #ff5a5f;
  --yellow: #ffd65a;
  --line: #c8ded7;
  --shadow: 0 16px 40px rgba(16, 42, 42, 0.12);
  --radius: 8px;
  --max: 1160px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  pointer-events: none;
  background-image: linear-gradient(rgba(16, 42, 42, 0.035) 1px, transparent 1px), linear-gradient(90deg, rgba(16, 42, 42, 0.035) 1px, transparent 1px);
  background-size: 24px 24px;
}

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

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

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

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--white);
  transform: translateY(-150%);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 2px solid var(--ink);
  background: rgba(245, 255, 249, 0.94);
  backdrop-filter: blur(14px);
}

.nav-wrap {
  width: min(calc(100% - 32px), var(--max));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
  white-space: nowrap;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 8px;
}

.brand-name {
  font-size: 19px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 15px;
  font-weight: 700;
}

.main-nav a:not(.download-btn) {
  padding: 6px 0;
  border-bottom: 2px solid transparent;
}

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

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--white);
  cursor: pointer;
}

.menu-toggle span,
.menu-toggle::before,
.menu-toggle::after {
  display: block;
  width: 20px;
  height: 2px;
  margin: 4px auto;
  content: "";
  background: var(--ink);
}

.download-btn {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--mint);
  box-shadow: 4px 4px 0 var(--ink);
  color: var(--ink);
  font-weight: 900;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

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

.download-btn.dark {
  background: var(--ink);
  box-shadow: 4px 4px 0 var(--red);
  color: var(--white);
}

.container {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
}

.hero {
  overflow: hidden;
  border-bottom: 2px solid var(--ink);
}

.hero-grid {
  min-height: 690px;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 64px;
  padding: 72px 0 58px;
}

.kicker {
  display: inline-block;
  margin: 0 0 18px;
  padding: 4px 10px;
  border: 2px solid var(--ink);
  background: var(--yellow);
  font-size: 13px;
  font-weight: 900;
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.25;
  letter-spacing: 0;
}

h1 {
  max-width: 650px;
  margin-bottom: 20px;
  font-size: clamp(44px, 7vw, 82px);
  font-weight: 950;
}

h2 {
  margin-bottom: 28px;
  font-size: clamp(30px, 4vw, 48px);
}

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

.hero-copy {
  max-width: 610px;
  margin: 0 0 28px;
  color: var(--ink-soft);
  font-size: 18px;
}

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

.text-link {
  border-bottom: 2px solid var(--red);
  font-weight: 800;
}

.hero-visual {
  position: relative;
  min-height: 530px;
}

.hero-phone {
  position: absolute;
  width: min(62vw, 310px);
  max-width: 310px;
  overflow: hidden;
  border: 8px solid var(--ink);
  border-radius: 28px;
  background: var(--ink);
  box-shadow: var(--shadow);
}

.hero-phone img {
  width: 100%;
}

.hero-phone.primary {
  top: 0;
  left: 6%;
  z-index: 2;
  transform: rotate(-3deg);
}

.hero-phone.secondary {
  top: 78px;
  right: 0;
  z-index: 1;
  transform: rotate(6deg);
}

.burst {
  position: absolute;
  right: 2%;
  bottom: 12px;
  z-index: 3;
  display: grid;
  width: 132px;
  height: 132px;
  place-items: center;
  border: 3px solid var(--ink);
  border-radius: 50%;
  background: var(--red);
  color: var(--white);
  font-size: 15px;
  font-weight: 900;
  text-align: center;
  transform: rotate(8deg);
}

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

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

.fact {
  min-height: 118px;
  padding: 24px;
  border-right: 1px solid #47615f;
}

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

.fact strong {
  display: block;
  color: var(--mint);
  font-size: 24px;
}

.fact span {
  font-size: 14px;
}

.section {
  padding: 92px 0;
  border-bottom: 2px solid var(--ink);
}

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

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 34px;
}

.section-head h2 {
  margin-bottom: 0;
}

.section-index {
  color: var(--red);
  font-family: Consolas, monospace;
  font-size: 16px;
  font-weight: 900;
}

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

.feature-item {
  min-height: 190px;
  padding: 28px;
  border-right: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  background: var(--paper);
}

.feature-number {
  display: inline-grid;
  width: 34px;
  height: 34px;
  margin-bottom: 22px;
  place-items: center;
  border-radius: 50%;
  background: var(--red);
  color: var(--white);
  font-family: Consolas, monospace;
  font-weight: 900;
}

.feature-item p,
.step-copy p,
.faq-answer,
.article-copy p {
  margin: 0;
  color: var(--ink-soft);
}

.shots {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.shot {
  margin: 0;
}

.shot-button {
  width: 100%;
  padding: 0;
  overflow: hidden;
  border: 3px solid var(--ink);
  border-radius: var(--radius);
  background: var(--ink);
  box-shadow: 5px 5px 0 var(--mint-dark);
  cursor: zoom-in;
}

.shot img {
  width: 100%;
  max-width: 400px;
  transition: transform 220ms ease;
}

.shot-button:hover img {
  transform: scale(1.025);
}

.shot figcaption {
  padding: 16px 2px 0;
  font-weight: 800;
}

.shot figcaption span {
  display: block;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 500;
}

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

.route {
  position: relative;
  min-height: 290px;
  padding: 34px;
  overflow: hidden;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background: var(--white);
}

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

.route-mark {
  position: absolute;
  top: 12px;
  right: 20px;
  color: rgba(16, 42, 42, 0.12);
  font-family: Georgia, serif;
  font-size: 92px;
  font-weight: 900;
  line-height: 1;
}

.route ul {
  padding-left: 20px;
  color: var(--ink-soft);
}

.route .text-link {
  display: inline-block;
  margin-top: 12px;
}

.review-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review {
  margin: 0;
  padding: 28px;
  border-left: 6px solid var(--red);
  background: var(--paper);
}

.review p {
  margin-top: 0;
  font-size: 17px;
  font-weight: 700;
}

.review cite {
  color: var(--ink-soft);
  font-size: 13px;
  font-style: normal;
}

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

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

summary {
  position: relative;
  padding: 22px 48px 22px 0;
  list-style: none;
  font-size: 18px;
  font-weight: 900;
  cursor: pointer;
}

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

summary::after {
  position: absolute;
  top: 18px;
  right: 8px;
  width: 32px;
  height: 32px;
  content: "+";
  border: 2px solid var(--ink);
  border-radius: 50%;
  line-height: 27px;
  text-align: center;
}

details[open] summary::after {
  content: "−";
  background: var(--mint);
}

.faq-answer {
  max-width: 900px;
  padding: 0 48px 24px 0;
}

.cta-band {
  padding: 72px 0;
  background: var(--mint);
  border-bottom: 2px solid var(--ink);
}

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.cta-inner h2 {
  max-width: 700px;
  margin-bottom: 8px;
}

.cta-inner p {
  margin: 0;
}

.page-hero {
  padding: 86px 0 66px;
  border-bottom: 2px solid var(--ink);
}

.page-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  align-items: end;
  gap: 64px;
}

.page-hero h1 {
  margin-bottom: 18px;
  font-size: clamp(42px, 6vw, 70px);
}

.page-hero p {
  max-width: 760px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 18px;
}

.page-stamp {
  max-width: 100%;
  padding: 26px;
  border: 3px solid var(--ink);
  background: var(--yellow);
  box-shadow: 7px 7px 0 var(--red);
  font-weight: 900;
  transform: rotate(2deg);
}

.guide-layout {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  align-items: start;
  gap: 64px;
}

.side-nav {
  position: sticky;
  top: 100px;
  padding: 18px;
  border: 2px solid var(--ink);
  background: var(--white);
}

.side-nav strong {
  display: block;
  margin-bottom: 10px;
}

.side-nav a {
  display: block;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 14px;
}

.step-list {
  min-width: 0;
  counter-reset: guide;
}

.guide-step {
  display: grid;
  min-width: 0;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 26px;
  padding: 0 0 48px;
  counter-increment: guide;
}

.guide-step::before {
  display: grid;
  width: 64px;
  height: 64px;
  place-items: center;
  content: counter(guide, decimal-leading-zero);
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--mint);
  font-family: Consolas, monospace;
  font-size: 19px;
  font-weight: 900;
}

.step-copy {
  min-width: 0;
  padding-bottom: 46px;
  border-bottom: 2px solid var(--line);
  overflow-wrap: anywhere;
}

.step-copy p + p,
.article-copy p + p {
  margin-top: 14px;
}

.checklist {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.check-item {
  padding: 18px;
  border: 2px solid var(--ink);
  background: var(--white);
  font-weight: 800;
}

.notice {
  margin: 28px 0;
  padding: 22px 24px;
  border-left: 6px solid var(--red);
  background: #fff3f3;
}

.notice strong {
  display: block;
}

.article-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
}

.article-copy h2 {
  margin-top: 54px;
  font-size: 34px;
}

.article-copy {
  min-width: 0;
  overflow-wrap: anywhere;
}

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

.phone-aside {
  position: sticky;
  top: 110px;
  align-self: start;
}

.phone-aside img {
  width: 100%;
  max-width: 360px;
  margin: 0 auto;
  border: 7px solid var(--ink);
  border-radius: 26px;
  box-shadow: 9px 9px 0 var(--mint-dark);
}

.phone-aside p {
  max-width: 360px;
  margin: 18px auto 0;
  color: var(--ink-soft);
  font-size: 13px;
}

.topic-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 34px;
}

.topic-links a {
  padding: 7px 12px;
  border: 1px solid var(--ink);
  background: var(--white);
  font-size: 13px;
  font-weight: 700;
}

.site-footer {
  padding: 52px 0 28px;
  background: var(--ink);
  color: var(--white);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 34px;
}

.footer-grid h2,
.footer-grid h3 {
  font-size: 17px;
}

.footer-grid p,
.footer-grid a {
  color: #c5d7d3;
  font-size: 14px;
}

.footer-links a {
  display: block;
  padding: 4px 0;
}

.disclaimer {
  padding: 18px 0;
  border-top: 1px solid #47615f;
  border-bottom: 1px solid #47615f;
  color: #c5d7d3;
  font-size: 13px;
}

.copyright {
  margin: 20px 0 0;
  color: #8fa6a1;
  font-size: 13px;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: none;
  place-items: center;
  padding: 24px;
  background: rgba(7, 20, 20, 0.9);
}

.lightbox.open {
  display: grid;
}

.lightbox img {
  width: auto;
  max-width: 400px;
  max-height: 86vh;
  border: 4px solid var(--white);
}

.lightbox-close {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 44px;
  height: 44px;
  border: 2px solid var(--white);
  border-radius: 50%;
  background: var(--ink);
  color: var(--white);
  font-size: 25px;
  cursor: pointer;
}

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

  .main-nav {
    position: absolute;
    top: 72px;
    right: 16px;
    left: 16px;
    display: none;
    padding: 18px;
    border: 2px solid var(--ink);
    background: var(--paper);
    box-shadow: var(--shadow);
  }

  .main-nav.open {
    display: grid;
  }

  .hero-grid,
  .page-hero-grid,
  .article-grid {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    min-height: 520px;
  }

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

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

  .side-nav,
  .phone-aside {
    position: static;
  }

  .side-nav {
    display: none;
  }
}

@media (max-width: 620px) {
  .nav-wrap,
  .container {
    width: min(calc(100% - 24px), var(--max));
  }

  .brand-name {
    font-size: 17px;
  }

  .hero-grid {
    min-height: auto;
    gap: 34px;
    padding: 50px 0 38px;
  }

  h1 {
    font-size: 45px;
  }

  h2 {
    font-size: 32px;
  }

  .hero-visual {
    min-height: 430px;
  }

  .hero-phone {
    width: 230px;
  }

  .hero-phone.secondary {
    right: -30px;
  }

  .burst {
    width: 106px;
    height: 106px;
  }

  .facts,
  .feature-grid,
  .shots,
  .route-grid,
  .review-row,
  .checklist,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .fact {
    border-right: 0;
    border-bottom: 1px solid #47615f;
  }

  .section {
    padding: 64px 0;
  }

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

  .guide-step {
    grid-template-columns: 50px minmax(0, 1fr);
    gap: 16px;
  }

  .guide-step::before {
    width: 46px;
    height: 46px;
    font-size: 15px;
  }

  .page-hero {
    padding: 56px 0 44px;
  }
}

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

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