:root {
  --paper: #f7f3e8;
  --ink: #153b3a;
  --muted: #5f6d68;
  --coral: #f05a4f;
  --coral-dark: #d83f37;
  --mint: #57b7a9;
  --lemon: #f2c94c;
  --white: #fffdf8;
  --line: #d9d7ca;
  --shadow: 0 18px 50px rgba(21, 59, 58, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif;
  line-height: 1.75;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: radial-gradient(rgba(21, 59, 58, 0.08) 0.8px, transparent 0.8px);
  background-size: 18px 18px;
  content: "";
  pointer-events: none;
}

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

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

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(21, 59, 58, 0.12);
  background: rgba(247, 243, 232, 0.94);
  backdrop-filter: blur(14px);
}

.nav-wrap {
  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: 19px;
  font-weight: 800;
}

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

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

.site-nav > a:not(.button) {
  padding: 8px 12px;
  border-bottom: 2px solid transparent;
  font-size: 15px;
  font-weight: 700;
}

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

.button {
  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(--coral);
  box-shadow: 4px 4px 0 var(--ink);
  color: #ffffff;
  font-weight: 800;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

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

.button:focus-visible,
.nav-toggle:focus-visible,
summary:focus-visible,
a:focus-visible {
  outline: 3px solid var(--lemon);
  outline-offset: 3px;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--ink);
  border-radius: 6px;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  margin: 5px 0;
  background: var(--ink);
}

.hero {
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  min-height: 670px;
  grid-template-columns: minmax(0, 1.05fr) minmax(420px, 0.95fr);
  align-items: center;
  gap: clamp(40px, 7vw, 92px);
  padding-block: 72px;
}

.eyebrow,
.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  color: var(--coral-dark);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.eyebrow::before,
.section-kicker::before {
  width: 32px;
  height: 4px;
  background: var(--coral);
  content: "";
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 22px;
  font-size: clamp(42px, 6vw, 76px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-copy > p {
  max-width: 650px;
  margin-bottom: 28px;
  color: #3f504c;
  font-size: 18px;
}

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

.file-note {
  color: var(--muted);
  font-size: 14px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.hero-tags span {
  padding: 4px 10px;
  border: 1px solid var(--mint);
  background: var(--white);
  color: var(--ink);
  font-size: 12px;
  font-weight: 700;
}

.hero-visual {
  position: relative;
  display: flex;
  min-height: 520px;
  align-items: center;
  justify-content: center;
}

.hero-visual::before {
  position: absolute;
  width: 390px;
  height: 390px;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--lemon);
  content: "";
}

.hero-phone {
  position: relative;
  z-index: 2;
  width: min(270px, 64vw);
  max-width: 400px;
  height: auto;
  margin: auto 0;
  border: 8px solid var(--ink);
  border-radius: 28px;
  box-shadow: 18px 20px 0 var(--mint);
}

.hero-stamp {
  position: absolute;
  right: 4%;
  bottom: 13%;
  z-index: 3;
  display: grid;
  width: 106px;
  height: 106px;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--white);
  color: var(--ink);
  font-size: 14px;
  font-weight: 900;
  line-height: 1.3;
  text-align: center;
  transform: rotate(8deg);
}

.fact-strip {
  border-bottom: 1px solid var(--line);
  background: var(--ink);
  color: var(--white);
}

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

.fact {
  padding: 25px 28px;
  border-right: 1px solid rgba(255, 255, 255, 0.18);
}

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

.fact strong {
  display: block;
  color: var(--lemon);
  font-size: 20px;
}

.fact span {
  color: rgba(255, 255, 255, 0.78);
  font-size: 13px;
}

.section {
  padding-block: 92px;
  border-bottom: 1px solid var(--line);
}

.section-alt {
  background: rgba(255, 253, 248, 0.72);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 30px;
  margin-bottom: 38px;
}

.section-head h2 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.15;
  letter-spacing: 0;
}

.text-link {
  flex: 0 0 auto;
  border-bottom: 2px solid var(--coral);
  font-weight: 800;
}

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

.feature-item {
  position: relative;
  min-height: 235px;
  padding: 28px;
  border: 1px solid var(--ink);
  border-radius: 6px;
  background: var(--white);
}

.feature-item:nth-child(2),
.feature-item:nth-child(5) {
  background: #dff2ec;
}

.feature-item:nth-child(3) {
  background: #fff0cf;
}

.feature-number {
  display: block;
  margin-bottom: 36px;
  color: var(--coral);
  font-family: Consolas, Monaco, monospace;
  font-size: 14px;
  font-weight: 800;
}

.feature-item h3 {
  margin-bottom: 10px;
  font-size: 21px;
  letter-spacing: 0;
}

.feature-item p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 15px;
}

.screen-rail {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.screen-item {
  margin: 0;
}

.screen-frame {
  display: flex;
  min-height: 520px;
  align-items: center;
  justify-content: center;
  padding: 24px;
  border: 1px solid var(--ink);
  border-radius: 6px;
  background: var(--white);
}

.screen-item:nth-child(2) .screen-frame {
  background: #dff2ec;
}

.screen-item:nth-child(3) .screen-frame {
  background: #fff0cf;
}

.screen-frame img,
.content-shot {
  width: auto;
  max-width: 400px;
  max-height: 470px;
  border: 5px solid var(--ink);
  border-radius: 22px;
  box-shadow: 8px 8px 0 var(--coral);
}

.screen-item figcaption {
  padding-top: 15px;
  font-weight: 800;
}

.screen-item figcaption span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
}

.path-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.path-card {
  display: grid;
  min-height: 255px;
  padding: 34px;
  border: 1px solid var(--ink);
  border-radius: 6px;
  background: var(--white);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.path-card:hover {
  transform: translateY(-4px);
  box-shadow: 8px 8px 0 var(--ink);
}

.path-card .tag {
  align-self: start;
  justify-self: start;
}

.path-card h3 {
  align-self: end;
  margin: 48px 0 8px;
  font-size: 27px;
}

.path-card p {
  margin: 0;
  color: var(--muted);
}

.tag {
  display: inline-block;
  padding: 4px 9px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: var(--lemon);
  font-size: 12px;
  font-weight: 900;
}

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

.score-block {
  position: sticky;
  top: 112px;
}

.score {
  display: block;
  margin-bottom: 8px;
  color: var(--coral);
  font-size: 76px;
  font-weight: 900;
  line-height: 1;
}

.reviews {
  display: grid;
  gap: 16px;
}

blockquote {
  margin: 0;
  padding: 25px 28px;
  border-left: 5px solid var(--mint);
  background: var(--white);
  box-shadow: 0 6px 18px rgba(21, 59, 58, 0.06);
}

blockquote p {
  margin-bottom: 10px;
}

blockquote cite {
  color: var(--muted);
  font-size: 13px;
  font-style: normal;
}

.download-band {
  padding-block: 62px;
  background: var(--coral);
  color: #ffffff;
}

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

.download-inner h2 {
  max-width: 700px;
  margin: 0;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.2;
}

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

.page-hero {
  padding-block: 82px 62px;
  border-bottom: 1px solid var(--line);
}

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

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

.article-layout {
  display: grid;
  grid-template-columns: 230px minmax(0, 760px);
  justify-content: space-between;
  gap: 60px;
  padding-block: 72px 96px;
}

.side-index {
  position: sticky;
  top: 104px;
  align-self: start;
  padding: 20px 0;
  border-block: 1px solid var(--line);
}

.side-index strong {
  display: block;
  margin-bottom: 12px;
}

.side-index a {
  display: block;
  padding: 7px 0;
  color: var(--muted);
  font-size: 14px;
}

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

.article h2 {
  margin: 58px 0 22px;
  font-size: 34px;
  line-height: 1.25;
}

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

.article h3 {
  margin: 28px 0 10px;
  font-size: 21px;
}

.article p,
.article li {
  color: #40514d;
}

.article ol,
.article ul {
  padding-left: 22px;
}

.article li + li {
  margin-top: 10px;
}

.notice {
  margin: 26px 0;
  padding: 20px 22px;
  border-left: 5px solid var(--lemon);
  background: #fff9df;
}

.step {
  display: grid;
  grid-template-columns: 62px 1fr;
  gap: 18px;
  margin: 22px 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.step-number {
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--coral);
  color: #ffffff;
  font-weight: 900;
}

.step h3 {
  margin-top: 0;
}

.article-figure {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 34px 0;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #dff2ec;
}

.article-figure img {
  width: min(400px, 100%);
  max-width: 100%;
  max-height: 570px;
  height: auto;
  object-fit: contain;
}

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

.faq-list details {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.faq-list summary {
  position: relative;
  padding: 20px 52px 20px 22px;
  cursor: pointer;
  font-weight: 800;
  list-style: none;
}

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

.faq-list summary::after {
  position: absolute;
  top: 50%;
  right: 22px;
  content: "+";
  font-size: 24px;
  transform: translateY(-50%);
}

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

.faq-list details p {
  margin: 0;
  padding: 0 22px 22px;
}

.site-footer {
  padding-block: 54px 30px;
  background: var(--ink);
  color: rgba(255, 255, 255, 0.78);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 0.8fr;
  gap: 44px;
  padding-bottom: 40px;
}

.site-footer .brand {
  margin-bottom: 14px;
  color: #ffffff;
}

.site-footer p {
  max-width: 470px;
  font-size: 14px;
}

.footer-links strong {
  display: block;
  margin-bottom: 12px;
  color: #ffffff;
}

.footer-links a {
  display: block;
  padding: 4px 0;
  font-size: 14px;
}

.disclaimer {
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  font-size: 13px;
}

.copyright {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.52);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 500ms ease, transform 500ms ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

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

  .site-nav {
    position: absolute;
    top: 72px;
    right: 20px;
    left: 20px;
    display: none;
    align-items: stretch;
    padding: 14px;
    border: 1px solid var(--ink);
    border-radius: 6px;
    background: var(--white);
    box-shadow: var(--shadow);
  }

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

  .site-nav > a:not(.button) {
    border-bottom: 1px solid var(--line);
  }

  .hero-grid {
    min-height: auto;
    grid-template-columns: 1fr;
    padding-block: 60px 70px;
  }

  .hero-visual {
    min-height: 480px;
  }

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

  .screen-rail {
    grid-template-columns: 1fr;
  }

  .screen-frame {
    min-height: auto;
  }

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

  .side-index {
    position: static;
  }
}

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

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

  .site-nav {
    top: 66px;
    right: 14px;
    left: 14px;
  }

  h1 {
    font-size: 42px;
  }

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

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

  .hero-visual::before {
    width: 300px;
    height: 300px;
  }

  .hero-stamp {
    right: 0;
    bottom: 8%;
    width: 88px;
    height: 88px;
    font-size: 12px;
  }

  .facts,
  .feature-grid,
  .path-grid,
  .review-layout,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .fact {
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  }

  .section {
    padding-block: 68px;
  }

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

  .score-block {
    position: static;
  }

  .article-layout {
    gap: 32px;
    padding-block: 52px 72px;
  }

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

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}