:root {
  --ink: #101b2d;
  --paper: #f7f3ea;
  --paper-deep: #ebe5d8;
  --coral: #ff6a5e;
  --coral-dark: #dd4e45;
  --mint: #72d6c9;
  --yellow: #f4cd58;
  --white: #ffffff;
  --muted: #596273;
  --line: #cfc8bb;
  --shadow: 8px 8px 0 rgba(16, 27, 45, 0.12);
  --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;
  line-height: 1.75;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  opacity: 0.17;
  background-image: radial-gradient(#101b2d 0.7px, transparent 0.7px);
  background-size: 13px 13px;
  pointer-events: none;
}

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

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

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 2px solid var(--ink);
  background: rgba(247, 243, 234, 0.96);
  backdrop-filter: blur(12px);
}

.nav-shell {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 900;
}

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

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

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

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 10px 20px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--coral);
  box-shadow: 4px 4px 0 var(--ink);
  color: var(--ink);
  font-weight: 900;
  line-height: 1;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

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

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

.button--small {
  min-height: 40px;
  padding: 8px 15px;
  font-size: 14px;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--white);
  font-size: 23px;
  cursor: pointer;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 72px 0 88px;
  border-bottom: 2px solid var(--ink);
  background: var(--ink);
  color: var(--white);
}

.hero::after {
  position: absolute;
  right: -90px;
  bottom: -130px;
  width: 360px;
  height: 360px;
  border: 42px solid var(--yellow);
  border-radius: 50%;
  content: "";
  opacity: 0.14;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
  align-items: center;
  gap: 72px;
}

.eyebrow,
.kicker {
  display: inline-block;
  margin: 0 0 16px;
  padding: 5px 10px;
  border: 1px solid currentColor;
  color: var(--yellow);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0;
}

.hero h1,
.page-hero h1 {
  max-width: 720px;
  margin: 0 0 22px;
  font-size: clamp(40px, 7vw, 82px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-copy > p:not(.eyebrow) {
  max-width: 590px;
  margin: 0 0 26px;
  color: #dce2ea;
  font-size: 18px;
}

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

.hero-note {
  color: #aeb8c7;
  font-size: 13px;
}

.phone-stage {
  position: relative;
  min-height: 560px;
}

.phone {
  position: absolute;
  width: min(245px, 44%);
  overflow: hidden;
  border: 8px solid #070c15;
  border-radius: 28px;
  background: #070c15;
  box-shadow: 20px 24px 0 rgba(0, 0, 0, 0.26);
}

.phone img {
  width: 100%;
  height: auto;
  border-radius: 18px;
}

.phone--one {
  top: 10px;
  left: 4%;
  transform: rotate(-4deg);
}

.phone--two {
  top: 70px;
  right: 2%;
  transform: rotate(4deg);
}

.phone--three {
  right: 28%;
  bottom: -60px;
  transform: rotate(-1deg);
}

.burst {
  position: absolute;
  top: 6px;
  right: 18%;
  z-index: 4;
  display: grid;
  width: 96px;
  height: 96px;
  place-items: center;
  border: 3px solid var(--ink);
  background: var(--yellow);
  color: var(--ink);
  font-size: 16px;
  font-weight: 900;
  text-align: center;
  transform: rotate(9deg);
  clip-path: polygon(50% 0, 61% 17%, 79% 7%, 82% 28%, 100% 33%, 85% 48%, 98% 65%, 76% 68%, 74% 91%, 55% 78%, 42% 100%, 33% 79%, 10% 89%, 15% 65%, 0 55%, 18% 42%, 5% 22%, 29% 21%);
}

.stat-bar {
  border-bottom: 2px solid var(--ink);
  background: var(--mint);
}

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

.stat {
  padding: 23px;
  border-right: 2px solid var(--ink);
  text-align: center;
}

.stat:first-child {
  border-left: 2px solid var(--ink);
}

.stat strong {
  display: block;
  font-size: 25px;
  line-height: 1.2;
}

.stat span {
  font-size: 13px;
  font-weight: 700;
}

.section {
  padding: 88px 0;
}

.section--white {
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  background: var(--white);
}

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

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

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

.section-index {
  min-width: 42px;
  height: 42px;
  border: 2px solid currentColor;
  color: var(--coral);
  font-weight: 900;
  line-height: 38px;
  text-align: center;
}

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

.feature-card {
  min-height: 255px;
  padding: 24px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.feature-card:nth-child(2) {
  background: #fff0ee;
}

.feature-card:nth-child(3) {
  background: #e7f8f4;
}

.feature-card:nth-child(4) {
  background: #fff8d8;
}

.feature-mark {
  display: grid;
  width: 48px;
  height: 48px;
  margin-bottom: 44px;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--yellow);
  font-size: 21px;
  font-weight: 900;
}

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

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

.preview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.preview-item {
  margin: 0;
}

.preview-frame {
  padding: 16px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--paper-deep);
}

.preview-frame img {
  width: 100%;
  max-width: 400px;
  height: auto;
  margin: 0 auto;
  border: 2px solid var(--ink);
  border-radius: 6px;
}

.preview-item figcaption {
  padding-top: 12px;
  font-size: 14px;
  font-weight: 800;
}

.journey-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.journey-panel {
  position: relative;
  min-height: 320px;
  padding: 34px;
  overflow: hidden;
  border: 2px solid var(--white);
  border-radius: 6px;
}

.journey-panel:first-child {
  background: var(--coral);
  color: var(--ink);
}

.journey-panel:last-child {
  background: var(--mint);
  color: var(--ink);
}

.journey-panel .number {
  position: absolute;
  right: 18px;
  bottom: -45px;
  color: rgba(16, 27, 45, 0.18);
  font-size: 170px;
  font-weight: 900;
  line-height: 1;
}

.journey-panel h3 {
  max-width: 390px;
  margin: 54px 0 14px;
  font-size: 30px;
  line-height: 1.2;
}

.journey-panel p {
  position: relative;
  z-index: 1;
  max-width: 410px;
  margin: 0 0 22px;
}

.text-link {
  display: inline-block;
  border-bottom: 2px solid currentColor;
  font-weight: 900;
}

.reviews-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
}

.quote-stack {
  display: grid;
  gap: 18px;
}

.quote {
  margin: 0;
  padding: 25px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--white);
  box-shadow: 5px 5px 0 var(--ink);
}

.quote p {
  margin: 0 0 14px;
  font-size: 17px;
}

.quote footer {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.rating-poster {
  display: flex;
  min-height: 100%;
  padding: 34px;
  border: 2px solid var(--ink);
  align-items: center;
  justify-content: center;
  background: var(--yellow);
  text-align: center;
}

.rating-poster strong {
  display: block;
  font-size: 92px;
  line-height: 1;
}

.rating-poster span {
  display: block;
  margin-top: 14px;
  font-weight: 900;
}

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

.faq-item {
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--white);
}

.faq-question {
  display: flex;
  width: 100%;
  min-height: 58px;
  padding: 14px 18px;
  border: 0;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  background: transparent;
  color: var(--ink);
  font-family: inherit;
  font-size: 16px;
  font-weight: 900;
  text-align: left;
  cursor: pointer;
}

.faq-question::after {
  content: "+";
  font-size: 25px;
  line-height: 1;
}

.faq-item.is-open .faq-question::after {
  content: "-";
}

.faq-answer {
  display: none;
  padding: 0 18px 18px;
  color: var(--muted);
}

.faq-answer p {
  margin: 0;
}

.faq-item.is-open .faq-answer {
  display: block;
}

.download-band {
  padding: 46px 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: 28px;
}

.download-band h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.2;
}

.site-footer {
  padding: 40px 0;
  background: var(--ink);
  color: #bfc8d5;
  font-size: 13px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 50px;
}

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

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 14px;
  color: var(--white);
  font-weight: 800;
}

.disclaimer,
.copyright {
  margin: 7px 0 0;
}

.page-hero {
  padding: 72px 0 64px;
  border-bottom: 2px solid var(--ink);
  background: var(--ink);
  color: var(--white);
}

.page-hero h1 {
  font-size: clamp(38px, 6vw, 68px);
}

.page-hero p:last-child {
  max-width: 760px;
  margin: 0;
  color: #dce2ea;
  font-size: 18px;
}

.breadcrumb {
  margin-bottom: 18px;
  color: var(--mint);
  font-size: 13px;
  font-weight: 800;
}

.article-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 50px;
  padding: 72px 0 90px;
}

.article-main {
  min-width: 0;
}

.article-aside {
  align-self: start;
  position: sticky;
  top: 96px;
  padding: 24px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.article-aside h2 {
  margin: 0 0 16px;
  font-size: 18px;
}

.article-aside a:not(.button) {
  display: block;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  font-weight: 700;
}

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

.content-section {
  padding: 0 0 62px;
  scroll-margin-top: 100px;
}

.content-section h2 {
  margin-bottom: 28px;
  padding-bottom: 12px;
  border-bottom: 3px solid var(--ink);
  font-size: 32px;
}

.content-section h3 {
  margin: 26px 0 10px;
  font-size: 22px;
}

.content-section p {
  margin: 0 0 18px;
  color: #394356;
}

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

.step-card {
  position: relative;
  min-height: 180px;
  padding: 28px 28px 28px 108px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--white);
  counter-increment: guide-step;
}

.step-card::before {
  position: absolute;
  top: 28px;
  left: 26px;
  display: grid;
  width: 56px;
  height: 56px;
  place-items: center;
  border: 2px solid var(--ink);
  background: var(--yellow);
  content: counter(guide-step, decimal-leading-zero);
  font-weight: 900;
}

.step-card h3 {
  margin-top: 0;
}

.tip-box {
  margin: 26px 0;
  padding: 24px;
  border: 2px solid var(--ink);
  border-left: 10px solid var(--mint);
  background: #e7f8f4;
}

.tip-box strong {
  display: block;
  margin-bottom: 6px;
}

.check-list {
  display: grid;
  padding: 0;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  list-style: none;
}

.check-list li {
  padding: 15px 16px 15px 44px;
  border: 1px solid var(--line);
  background: var(--white);
  position: relative;
}

.check-list li::before {
  position: absolute;
  left: 15px;
  color: var(--coral-dark);
  content: "✓";
  font-weight: 900;
}

.function-block {
  display: grid;
  margin-bottom: 24px;
  padding: 26px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  grid-template-columns: 58px 1fr;
  gap: 20px;
  background: var(--white);
}

.function-block .feature-mark {
  margin: 0;
}

.function-block h3 {
  margin-top: 0;
}

.function-block p:last-child {
  margin-bottom: 0;
}

.related-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.related-link {
  padding: 22px;
  border: 2px solid var(--ink);
  background: var(--yellow);
  font-weight: 900;
}

@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .phone-stage {
    min-height: 520px;
  }

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

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

  .article-aside {
    position: static;
    order: -1;
  }
}

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

  .menu-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 72px;
    right: 0;
    left: 0;
    display: none;
    padding: 18px 20px 24px;
    border-bottom: 2px solid var(--ink);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--paper);
  }

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

  .nav-links a:not(.button) {
    padding: 12px 0;
  }

  .hero {
    padding: 52px 0 66px;
  }

  .hero h1,
  .page-hero h1 {
    font-size: 44px;
  }

  .hero-copy > p:not(.eyebrow),
  .page-hero p:last-child {
    font-size: 16px;
  }

  .phone-stage {
    min-height: 430px;
  }

  .phone {
    width: 46%;
    border-width: 5px;
    border-radius: 20px;
  }

  .phone img {
    border-radius: 14px;
  }

  .phone--three {
    display: none;
  }

  .stats,
  .preview-grid,
  .journey-grid,
  .reviews-grid,
  .footer-grid,
  .related-links {
    grid-template-columns: 1fr;
  }

  .stat,
  .stat:first-child {
    border-right: 2px solid var(--ink);
    border-bottom: 2px solid var(--ink);
    border-left: 2px solid var(--ink);
  }

  .stat:last-child {
    border-bottom: 0;
  }

  .section {
    padding: 64px 0;
  }

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

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

  .article-shell {
    padding: 50px 0 64px;
  }

  .check-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .brand {
    font-size: 20px;
  }

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

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

  .phone-stage {
    min-height: 350px;
  }

  .burst {
    right: 3%;
    width: 78px;
    height: 78px;
    font-size: 13px;
  }

  .step-card {
    padding: 92px 22px 24px;
  }

  .step-card::before {
    top: 20px;
    left: 22px;
  }

  .function-block {
    grid-template-columns: 1fr;
  }
}

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

  *,
  *::before,
  *::after {
    transition: none !important;
  }
}