:root {
  --ink: #10243a;
  --ink-soft: #496174;
  --paper: #f6faf9;
  --white: #ffffff;
  --green: #0ea77a;
  --green-dark: #08775a;
  --blue: #1688d4;
  --coral: #ff5c6c;
  --yellow: #ffcf4a;
  --line: #dce8e5;
  --shadow: 0 18px 50px rgba(16, 36, 58, 0.11);
  --radius: 8px;
  --container: 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;
  letter-spacing: 0;
}

body.menu-open {
  overflow: hidden;
}

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(--container));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(246, 250, 249, 0.95);
  border-bottom: 1px solid rgba(16, 36, 58, 0.08);
  backdrop-filter: blur(16px);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  gap: 11px;
  font-size: 19px;
  font-weight: 800;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  box-shadow: 0 7px 16px rgba(16, 36, 58, 0.16);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 30px;
  margin-left: auto;
  font-size: 15px;
  font-weight: 700;
}

.site-nav a:not(.button) {
  position: relative;
  padding: 23px 0 20px;
}

.site-nav a:not(.button)::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 16px;
  height: 3px;
  background: var(--green);
  transition: right 180ms ease;
}

.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after {
  right: 0;
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
}

.menu-toggle span,
.menu-toggle::before,
.menu-toggle::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px auto;
  background: currentColor;
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  color: var(--white);
  background: var(--green);
  border: 1px solid var(--green);
  border-radius: 6px;
  box-shadow: 0 10px 25px rgba(14, 167, 122, 0.22);
  font-weight: 800;
  line-height: 1;
  transition: transform 180ms ease, background 180ms ease, box-shadow 180ms ease;
}

.button:hover {
  background: var(--green-dark);
  box-shadow: 0 14px 28px rgba(14, 167, 122, 0.28);
  transform: translateY(-2px);
}

.button-light {
  color: var(--ink);
  background: var(--white);
  border-color: var(--white);
  box-shadow: none;
}

.button-light:hover {
  color: var(--white);
  background: var(--coral);
  border-color: var(--coral);
}

.eyebrow {
  margin: 0 0 15px;
  color: var(--green-dark);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 34px;
  height: 3px;
  display: inline-block;
  margin-right: 10px;
  background: var(--coral);
  vertical-align: middle;
}

.hero {
  min-height: 660px;
  max-height: 660px;
  position: relative;
  overflow: hidden;
  color: var(--white);
  background: var(--ink);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(108deg, rgba(16, 36, 58, 0.98) 0 42%, rgba(16, 36, 58, 0.67) 68%, rgba(16, 36, 58, 0.9) 100%),
    url("../images/preview-01.webp") center 29% / cover no-repeat;
  transform: scale(1.05);
}

.hero::after {
  content: "";
  position: absolute;
  left: -10%;
  right: -10%;
  bottom: 56px;
  height: 58px;
  border-top: 3px solid rgba(22, 136, 212, 0.7);
  border-bottom: 3px solid rgba(14, 167, 122, 0.66);
  transform: rotate(-3deg);
}

.hero-grid {
  min-height: 660px;
  max-height: 660px;
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(310px, 0.75fr);
  align-items: center;
  gap: 70px;
  padding-top: 34px;
  padding-bottom: 74px;
}

.hero h1 {
  max-width: 720px;
  margin: 0;
  font-size: 70px;
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-lead {
  max-width: 650px;
  margin: 26px 0 30px;
  color: #d8e9ed;
  font-size: 18px;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 18px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 13px;
  margin-top: 28px;
  color: #bed1d8;
  font-size: 13px;
}

.hero-meta span {
  padding-right: 13px;
  border-right: 1px solid rgba(255, 255, 255, 0.23);
}

.hero-meta span:last-child {
  border-right: 0;
}

.hero-phone {
  justify-self: center;
  position: relative;
}

.phone-shell {
  width: min(236px, 68vw);
  padding: 10px;
  background: #08131f;
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: 34px;
  box-shadow: 0 34px 80px rgba(0, 0, 0, 0.42);
  transform: rotate(3deg);
}

.phone-shell img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: 24px;
}

.phone-note {
  position: absolute;
  right: -38px;
  bottom: 68px;
  width: 156px;
  padding: 14px 16px;
  color: var(--ink);
  background: var(--yellow);
  border-radius: 6px;
  box-shadow: var(--shadow);
  font-size: 13px;
  font-weight: 800;
  line-height: 1.5;
  transform: rotate(-3deg);
}

.signal-strip {
  position: relative;
  z-index: 2;
  margin-top: -38px;
}

.signal-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  overflow: hidden;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.signal-item {
  padding: 24px 26px;
  border-right: 1px solid var(--line);
}

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

.signal-item strong {
  display: block;
  color: var(--ink);
  font-size: 20px;
}

.signal-item span {
  color: var(--ink-soft);
  font-size: 13px;
}

.section {
  padding: 100px 0;
}

.section-tight {
  padding: 76px 0;
}

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

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

.section-head {
  max-width: 720px;
  margin-bottom: 44px;
}

.section-head h2,
.split-copy h2,
.download-band h2 {
  margin: 0;
  font-size: 46px;
  line-height: 1.22;
  letter-spacing: 0;
}

.section-head .eyebrow,
.section-ink .eyebrow {
  color: #69ddb9;
}

.feature-lines {
  border-top: 1px solid var(--line);
}

.feature-line {
  display: grid;
  grid-template-columns: 90px minmax(180px, 0.65fr) 1.5fr;
  align-items: start;
  gap: 24px;
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
}

.feature-index {
  color: var(--coral);
  font-size: 15px;
  font-weight: 800;
}

.feature-line h3 {
  margin: 0;
  font-size: 23px;
}

.feature-line p {
  margin: 0;
  color: var(--ink-soft);
}

.gallery-wrap {
  overflow: hidden;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.shot {
  margin: 0;
}

.shot img {
  width: 100%;
  max-width: 298px;
  height: auto;
  margin-inline: auto;
  border: 8px solid #08131f;
  border-radius: 30px;
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.28);
}

.shot figcaption {
  margin-top: 18px;
  color: #c2d1d7;
  font-size: 14px;
  text-align: center;
}

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

.entry-card {
  min-height: 285px;
  position: relative;
  padding: 36px;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.entry-card::after {
  content: attr(data-mark);
  position: absolute;
  right: 18px;
  bottom: -38px;
  color: rgba(22, 136, 212, 0.08);
  font-size: 120px;
  font-weight: 900;
  line-height: 1;
}

.entry-card h3 {
  margin: 0 0 14px;
  font-size: 28px;
}

.entry-card p {
  max-width: 510px;
  margin: 0 0 26px;
  color: var(--ink-soft);
}

.text-link {
  position: relative;
  z-index: 1;
  color: var(--green-dark);
  font-weight: 800;
  border-bottom: 2px solid var(--green);
}

.reviews {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 70px;
  align-items: start;
}

.score-block {
  position: sticky;
  top: 110px;
}

.score-number {
  margin: 8px 0 0;
  color: var(--coral);
  font-size: 88px;
  font-weight: 900;
  line-height: 1;
}

.score-block small {
  color: var(--ink-soft);
}

.review-list {
  border-top: 1px solid var(--line);
}

.review {
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.review blockquote {
  margin: 0 0 12px;
  font-size: 18px;
  line-height: 1.8;
}

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

.download-band {
  position: relative;
  overflow: hidden;
  padding: 76px 0;
  color: var(--white);
  background: var(--blue);
}

.download-band::before,
.download-band::after {
  content: "";
  position: absolute;
  left: -5%;
  right: -5%;
  height: 3px;
  background: rgba(255, 255, 255, 0.38);
  transform: rotate(-2deg);
}

.download-band::before {
  top: 22px;
}

.download-band::after {
  bottom: 22px;
}

.download-row {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.download-row p {
  max-width: 680px;
  margin: 14px 0 0;
  color: #e8f5ff;
}

.download-detail {
  max-width: 680px;
  margin: 14px 0 0;
  color: #e8f5ff;
}

.site-footer {
  color: #b8c7ce;
  background: #091725;
  font-size: 13px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.7fr 1.2fr;
  gap: 60px;
  padding: 54px 0 42px;
}

.footer-grid h2,
.footer-grid h3,
.footer-title {
  display: block;
  margin: 0 0 15px;
  color: var(--white);
  font-size: 16px;
}

.footer-grid p {
  margin: 0;
}

.footer-links {
  display: grid;
  gap: 8px;
}

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

.footer-bottom {
  padding: 20px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #8299a4;
  text-align: center;
}

.page-hero {
  padding: 78px 0 62px;
  color: var(--white);
  background: var(--ink);
}

.page-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 60px;
  align-items: end;
}

.page-hero h1 {
  max-width: 800px;
  margin: 0;
  font-size: 60px;
  line-height: 1.15;
  letter-spacing: 0;
}

.page-hero p {
  max-width: 740px;
  margin: 22px 0 0;
  color: #c7d9df;
  font-size: 17px;
}

.page-tag {
  padding: 24px;
  color: var(--ink);
  background: var(--yellow);
  border-radius: var(--radius);
  font-weight: 800;
}

.guide-layout,
.faq-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 64px;
  align-items: start;
}

.side-nav {
  position: sticky;
  top: 100px;
  padding: 22px;
  background: var(--white);
  border-left: 4px solid var(--green);
  box-shadow: 0 12px 35px rgba(16, 36, 58, 0.07);
}

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

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

.side-nav a:hover {
  color: var(--green-dark);
}

.article-content > section {
  margin-bottom: 70px;
  scroll-margin-top: 100px;
}

.article-content h2 {
  margin: 0 0 24px;
  font-size: 38px;
  line-height: 1.25;
}

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

.article-content p {
  margin: 0 0 18px;
  color: #344d61;
}

.article-content a:not(.button) {
  color: var(--green-dark);
  font-weight: 700;
  border-bottom: 1px solid var(--green);
}

.step-list {
  counter-reset: step;
}

.step {
  position: relative;
  padding: 0 0 42px 82px;
  border-left: 2px solid var(--line);
  margin-left: 25px;
}

.step:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: -27px;
  top: 0;
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  color: var(--white);
  background: var(--green);
  border-radius: 50%;
  font-weight: 900;
}

.step h3 {
  margin-top: 0;
}

.notice {
  padding: 24px 26px;
  background: #fff8db;
  border-left: 4px solid var(--yellow);
  border-radius: 0 var(--radius) var(--radius) 0;
}

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

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

.check-item {
  padding: 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.check-item strong {
  display: block;
  margin-bottom: 5px;
}

.check-item p {
  margin: 0;
  font-size: 14px;
}

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

.feature-deep article {
  padding: 28px;
  background: var(--white);
  border-top: 4px solid var(--blue);
  box-shadow: 0 10px 30px rgba(16, 36, 58, 0.06);
}

.feature-deep h2 {
  margin: 0 0 15px;
  font-size: 24px;
}

.feature-deep p:last-child {
  margin-bottom: 0;
}

.faq-group {
  margin-bottom: 48px;
}

.faq-group > h2 {
  padding-bottom: 14px;
  border-bottom: 3px solid var(--ink);
}

.faq-item {
  background: var(--white);
  border-bottom: 1px solid var(--line);
}

.faq-item:first-of-type {
  border-top: 1px solid var(--line);
}

.faq-item summary {
  position: relative;
  padding: 22px 54px 22px 0;
  cursor: pointer;
  list-style: none;
  font-size: 18px;
  font-weight: 800;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 15px;
  color: var(--green);
  font-size: 28px;
}

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

.faq-answer {
  padding: 0 48px 23px 0;
}

.faq-answer p,
.faq-answer ol {
  margin-top: 0;
  color: #344d61;
}

.related-box {
  padding: 30px;
  color: var(--white);
  background: var(--ink);
  border-radius: var(--radius);
}

.related-box h2 {
  margin: 0 0 15px;
  font-size: 26px;
}

.related-box p {
  color: #c4d4db;
}

.related-box a:not(.button) {
  color: #72e4c0;
  border-color: #72e4c0;
}

.reveal {
  opacity: 1;
  transform: none;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 960px) {
  .site-nav {
    position: fixed;
    inset: 73px 0 auto;
    display: none;
    align-items: stretch;
    padding: 22px 24px 28px;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
  }

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

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

  .site-nav a:not(.button)::after {
    bottom: 7px;
  }

  .menu-toggle {
    display: block;
  }

  .hero,
  .hero-grid {
    min-height: auto;
    max-height: none;
  }

  .hero-grid {
    grid-template-columns: 1fr 0.62fr;
    gap: 34px;
    padding-top: 70px;
    padding-bottom: 110px;
  }

  .hero h1 {
    font-size: 56px;
  }

  .phone-note {
    right: -12px;
  }

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

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

  .signal-item:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .gallery {
    grid-template-columns: repeat(2, 1fr);
    row-gap: 48px;
  }

  .reviews {
    grid-template-columns: 1fr;
    gap: 35px;
  }

  .score-block {
    position: static;
  }

  .guide-layout,
  .faq-layout {
    grid-template-columns: 1fr;
    gap: 35px;
  }

  .side-nav {
    position: static;
    display: flex;
    flex-wrap: wrap;
    gap: 2px 20px;
  }

  .side-nav strong {
    flex-basis: 100%;
  }
}

@media (max-width: 720px) {
  .container {
    width: min(calc(100% - 28px), var(--container));
  }

  .brand {
    font-size: 17px;
  }

  .hero::before {
    background:
      linear-gradient(180deg, rgba(16, 36, 58, 0.97) 0 52%, rgba(16, 36, 58, 0.8) 100%),
      url("../images/preview-01.webp") center top / cover no-repeat;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    padding-top: 56px;
    padding-bottom: 92px;
  }

  .hero h1 {
    font-size: 42px;
  }

  .section-head h2,
  .split-copy h2,
  .download-band h2 {
    font-size: 34px;
  }

  .page-hero h1 {
    font-size: 42px;
  }

  .article-content h2 {
    font-size: 30px;
  }

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

  .hero-phone {
    justify-self: start;
    margin-left: 18px;
  }

  .phone-shell {
    width: 230px;
  }

  .phone-note {
    right: -54px;
    bottom: 55px;
    width: 138px;
  }

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

  .signal-item {
    padding: 18px;
  }

  .signal-item strong {
    font-size: 17px;
  }

  .section {
    padding: 72px 0;
  }

  .section-tight {
    padding: 58px 0;
  }

  .feature-line {
    grid-template-columns: 54px 1fr;
    gap: 12px;
  }

  .feature-line p {
    grid-column: 2;
  }

  .gallery {
    display: flex;
    gap: 18px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding: 8px 16px 28px;
    margin-inline: -14px;
  }

  .shot {
    min-width: min(76vw, 298px);
    scroll-snap-align: center;
  }

  .entry-grid,
  .feature-deep,
  .check-grid {
    grid-template-columns: 1fr;
  }

  .entry-card {
    min-height: 240px;
    padding: 28px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .page-hero-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .page-hero {
    padding: 60px 0 50px;
  }

  .step {
    padding-left: 58px;
    margin-left: 18px;
  }

  .step::before {
    left: -21px;
    width: 40px;
    height: 40px;
    font-size: 12px;
  }

  .faq-item summary {
    font-size: 16px;
  }
}

@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;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}