:root {
  --wind: #0b7285;
  --wind-dark: #075463;
  --leaf: #84cc16;
  --coral: #ff6b4a;
  --ink: #17252a;
  --muted: #5d7076;
  --paper: #f7faf9;
  --line: #dbe5e3;
  --white: #ffffff;
  --shadow: 0 14px 38px rgba(20, 48, 55, 0.12);
}

* {
  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;
  background-image: linear-gradient(rgba(11, 114, 133, 0.035) 1px, transparent 1px), linear-gradient(90deg, rgba(11, 114, 133, 0.035) 1px, transparent 1px);
  background-size: 28px 28px;
  content: "";
}

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

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

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(219, 229, 227, 0.9);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
}

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

.brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0;
}

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

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

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav > a:not(.button) {
  position: relative;
  padding: 8px 0;
  color: #395158;
  font-size: 15px;
  font-weight: 700;
}

.site-nav > a[aria-current="page"]::after,
.site-nav > a:not(.button):hover::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 3px;
  border-radius: 3px;
  background: var(--coral);
  content: "";
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: var(--white);
  font-size: 22px;
  cursor: pointer;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border: 2px solid var(--wind);
  border-radius: 6px;
  background: var(--wind);
  color: var(--white);
  font-weight: 800;
  line-height: 1;
  transition: transform 0.2s ease, background 0.2s ease;
}

.button:hover {
  background: var(--wind-dark);
  transform: translateY(-2px);
}

.button-secondary {
  border-color: var(--ink);
  background: transparent;
  color: var(--ink);
}

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

.hero {
  position: relative;
  overflow: hidden;
  padding: 72px 0 66px;
  border-bottom: 1px solid var(--line);
  background: #e8f4f1;
}

.hero::after {
  position: absolute;
  top: 54px;
  right: -90px;
  width: 380px;
  height: 90px;
  border-top: 14px solid var(--coral);
  border-bottom: 14px solid var(--leaf);
  opacity: 0.82;
  transform: rotate(-8deg);
  content: "";
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  align-items: center;
  gap: 64px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  color: var(--wind-dark);
  font-size: 14px;
  font-weight: 800;
}

.eyebrow::before {
  width: 24px;
  height: 4px;
  background: var(--coral);
  content: "";
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.22;
  letter-spacing: 0;
}

h1 {
  max-width: 650px;
  margin-bottom: 20px;
  font-size: clamp(38px, 5.5vw, 72px);
}

.hero-copy > p {
  max-width: 610px;
  margin: 0 0 28px;
  color: #3d565d;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 26px;
  padding: 0;
  color: #476168;
  font-size: 14px;
  list-style: none;
}

.hero-meta li::before {
  margin-right: 7px;
  color: var(--leaf);
  content: "●";
}

.phone-stage {
  position: relative;
  min-height: 530px;
}

.phone-stage::before {
  position: absolute;
  top: 30px;
  left: 50%;
  width: 320px;
  height: 390px;
  border: 22px solid var(--wind);
  content: "";
  transform: translateX(-50%) rotate(3deg);
}

.preview-image {
  width: min(298px, 72vw);
  max-width: 400px;
  height: auto;
  border: 8px solid var(--ink);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.phone-stage .preview-image {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%) rotate(-3deg);
}

.stage-note {
  position: absolute;
  right: 0;
  bottom: 28px;
  width: 200px;
  padding: 16px;
  border-left: 5px solid var(--coral);
  background: var(--white);
  box-shadow: var(--shadow);
  font-size: 14px;
  font-weight: 700;
}

.section {
  padding: 78px 0;
}

.section-alt {
  border-block: 1px solid var(--line);
  background: var(--white);
}

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

.section-heading h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 44px);
}

.section-kicker {
  color: var(--coral);
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

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

.feature-item {
  min-height: 220px;
  padding: 24px;
  border: 1px solid var(--line);
  border-top: 5px solid var(--wind);
  border-radius: 6px;
  background: var(--white);
}

.feature-item:nth-child(2) {
  border-top-color: var(--coral);
}

.feature-item:nth-child(3) {
  border-top-color: var(--leaf);
}

.feature-item:nth-child(4) {
  border-top-color: var(--ink);
}

.feature-number {
  color: var(--wind);
  font-size: 13px;
  font-weight: 900;
}

.feature-item h3 {
  margin: 20px 0 10px;
  font-size: 21px;
}

.feature-item p,
.detail-block p,
.step-card p {
  margin: 0;
  color: var(--muted);
}

.screen-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  align-items: start;
}

.screen-card {
  margin: 0;
}

.screen-card .preview-image {
  width: 100%;
  border-width: 5px;
}

.screen-card figcaption {
  padding: 14px 4px 0;
  color: #40575e;
  font-size: 14px;
}

.path-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}

.path-card {
  display: grid;
  min-height: 250px;
  grid-template-columns: 110px 1fr;
  align-items: start;
  gap: 24px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.path-label {
  display: grid;
  width: 92px;
  height: 92px;
  place-items: center;
  border: 7px solid var(--wind);
  color: var(--wind);
  font-size: 30px;
  font-weight: 900;
  transform: rotate(-4deg);
}

.path-card:nth-child(2) .path-label {
  border-color: var(--coral);
  color: var(--coral);
  transform: rotate(4deg);
}

.path-card h3 {
  margin-bottom: 10px;
  font-size: 25px;
}

.text-link {
  display: inline-flex;
  margin-top: 20px;
  color: var(--wind-dark);
  font-weight: 800;
}

.text-link::after {
  margin-left: 8px;
  content: "→";
}

.stats-band {
  padding: 34px 0;
  background: var(--ink);
  color: var(--white);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: #3b4d52;
}

.stat {
  padding: 26px;
  background: var(--ink);
  text-align: center;
}

.stat strong {
  display: block;
  color: var(--leaf);
  font-size: 28px;
}

.stat span {
  color: #c7d4d6;
  font-size: 14px;
}

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

.review {
  margin: 0;
  padding: 26px;
  border-left: 5px solid var(--coral);
  background: var(--white);
}

.review p {
  margin: 0 0 18px;
}

.review footer {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

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

.mini-faq article {
  padding: 22px;
  border-bottom: 4px solid var(--leaf);
  background: var(--white);
}

.mini-faq h3 {
  margin-bottom: 9px;
  font-size: 18px;
}

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

.download-band {
  padding: 56px 0;
  background: var(--wind);
  color: var(--white);
}

.download-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.download-inner h2 {
  margin-bottom: 8px;
  font-size: 34px;
}

.download-inner p,
.download-summary {
  margin: 0;
  color: #d7edef;
}

.download-band .button {
  border-color: var(--white);
  background: var(--white);
  color: var(--wind-dark);
}

.page-hero {
  padding: 64px 0 50px;
  border-bottom: 1px solid var(--line);
  background: #e8f4f1;
}

.page-hero h1 {
  margin-bottom: 18px;
  font-size: clamp(36px, 5vw, 58px);
}

.page-hero p {
  max-width: 760px;
  margin: 0;
  color: #405b62;
  font-size: 18px;
}

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  align-items: start;
  gap: 44px;
}

.content-main h2 {
  margin: 56px 0 24px;
  font-size: 32px;
}

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

.content-main > p {
  color: #425960;
}

.content-main p a,
.notice a {
  color: var(--wind-dark);
  font-weight: 800;
  text-decoration: underline;
  text-decoration-color: var(--leaf);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.side-nav {
  position: sticky;
  top: 98px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

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

.side-nav a {
  display: block;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  color: #496269;
  font-size: 14px;
}

.side-nav a:last-child {
  border-bottom: 0;
}

.step-list {
  display: grid;
  gap: 18px;
  padding: 0;
  list-style: none;
  counter-reset: steps;
}

.step-card {
  position: relative;
  padding: 28px 28px 28px 88px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
  counter-increment: steps;
}

.step-card::before {
  position: absolute;
  top: 26px;
  left: 24px;
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 50%;
  background: var(--wind);
  color: var(--white);
  font-weight: 900;
  content: counter(steps);
}

.step-card h3 {
  margin-bottom: 8px;
  font-size: 21px;
}

.notice {
  margin: 26px 0;
  padding: 20px 22px;
  border-left: 5px solid var(--coral);
  background: #fff3ef;
  color: #65453d;
}

.check-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding: 0;
  list-style: none;
}

.check-list li {
  padding: 14px 16px 14px 42px;
  background: var(--white);
  border: 1px solid var(--line);
  position: relative;
}

.check-list li::before {
  position: absolute;
  left: 16px;
  color: var(--leaf);
  font-weight: 900;
  content: "✓";
}

.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.detail-block {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

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

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

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

.faq-question {
  display: flex;
  width: 100%;
  min-height: 60px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 20px;
  border: 0;
  color: var(--ink);
  background: transparent;
  font: inherit;
  font-weight: 800;
  text-align: left;
  cursor: pointer;
}

.faq-question::after {
  flex: 0 0 auto;
  color: var(--wind);
  font-size: 22px;
  content: "+";
}

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

.faq-answer {
  display: none;
  padding: 0 20px 20px;
  color: var(--muted);
}

.faq-answer p {
  margin: 0;
}

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

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.related-links a {
  padding: 9px 13px;
  border: 1px solid var(--wind);
  border-radius: 4px;
  color: var(--wind-dark);
  font-size: 14px;
  font-weight: 700;
}

.site-footer {
  padding: 46px 0 28px;
  background: #102126;
  color: #c0d0d3;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr;
  gap: 40px;
}

.footer-brand {
  margin-bottom: 14px;
  color: var(--white);
}

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

.site-footer h3 {
  margin-bottom: 12px;
  color: var(--white);
  font-size: 16px;
}

.site-footer p {
  margin: 0;
  font-size: 13px;
}

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

.disclaimer {
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid #314348;
  color: #92a7ac;
  font-size: 12px;
}

.copyright {
  margin-top: 10px;
  color: #7f959a;
  font-size: 12px;
}

@media (max-width: 960px) {
  .feature-grid,
  .screen-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-grid {
    grid-template-columns: 1fr 0.85fr;
    gap: 24px;
  }

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

  .side-nav {
    position: static;
    order: -1;
  }
}

@media (max-width: 760px) {
  .container {
    width: min(100% - 28px, 1160px);
  }

  .menu-toggle {
    display: grid;
    place-items: center;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    right: 0;
    left: 0;
    display: none;
    align-items: stretch;
    padding: 18px 20px 22px;
    border-bottom: 1px solid var(--line);
    background: var(--white);
    box-shadow: var(--shadow);
  }

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

  .site-nav .button {
    margin-top: 8px;
  }

  .hero {
    padding: 52px 0 38px;
  }

  .hero::after {
    display: none;
  }

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

  h1 {
    font-size: 42px;
  }

  .phone-stage {
    min-height: 470px;
    margin-top: 22px;
  }

  .stage-note {
    right: 2px;
    bottom: 18px;
  }

  .section {
    padding: 58px 0;
  }

  .section-heading {
    align-items: start;
    flex-direction: column;
    gap: 8px;
  }

  .path-grid,
  .review-grid,
  .mini-faq,
  .footer-grid {
    grid-template-columns: 1fr;
  }

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

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

  .download-inner .button {
    width: 100%;
  }

  .footer-grid {
    gap: 26px;
  }
}

@media (max-width: 520px) {
  .brand span {
    font-size: 17px;
  }

  .feature-grid,
  .screen-grid,
  .detail-grid,
  .check-list {
    grid-template-columns: 1fr;
  }

  .path-card {
    grid-template-columns: 1fr;
  }

  .path-label {
    width: 72px;
    height: 72px;
  }

  .hero-actions .button {
    width: 100%;
  }

  .step-card {
    padding: 82px 22px 22px;
  }

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

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

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