:root {
  --ink: #17212b;
  --ink-soft: #52606d;
  --paper: #f8fcfd;
  --white: #ffffff;
  --sky: #159bd3;
  --sky-dark: #0879aa;
  --green: #25a96b;
  --coral: #f05f55;
  --sun: #ffd166;
  --line: #d9e5e9;
  --shadow: 0 18px 40px rgba(23, 33, 43, 0.12);
  --content: 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;
  font-size: 16px;
  line-height: 1.75;
}

body.nav-open {
  overflow: hidden;
}

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

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

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

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

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(217, 229, 233, 0.9);
  background: rgba(248, 252, 253, 0.96);
  backdrop-filter: blur(12px);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  font-size: 20px;
  font-weight: 800;
}

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

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

.nav-links a:not(.button) {
  color: #344451;
  font-size: 15px;
  font-weight: 700;
}

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

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
  font-size: 23px;
  cursor: pointer;
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 10px 20px;
  border: 0;
  border-radius: 6px;
  color: var(--white);
  background: var(--coral);
  box-shadow: 0 10px 24px rgba(240, 95, 85, 0.26);
  font-weight: 800;
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 28px rgba(240, 95, 85, 0.32);
}

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

.button-icon {
  font-size: 20px;
  line-height: 1;
}

.hero {
  position: relative;
  min-height: min(650px, 82vh);
  overflow: hidden;
  color: var(--white);
  background-image: linear-gradient(90deg, rgba(17, 29, 39, 0.95) 0%, rgba(17, 29, 39, 0.76) 48%, rgba(17, 29, 39, 0.3) 100%), url("../images/brand-scene.webp");
  background-position: center;
  background-size: cover;
}

.hero .container {
  position: relative;
  min-height: inherit;
  display: flex;
  align-items: center;
}

.hero-copy {
  position: relative;
  z-index: 2;
  width: min(620px, 62%);
  padding: 72px 0 82px;
}

.eyebrow {
  margin: 0 0 14px;
  color: #b8edff;
  font-size: 14px;
  font-weight: 800;
}

.hero h1 {
  margin: 0;
  font-size: clamp(42px, 6vw, 74px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-lead {
  max-width: 580px;
  margin: 24px 0 28px;
  color: #e8f3f6;
  font-size: 19px;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.hero-meta {
  color: #cfe0e5;
  font-size: 14px;
}

.hero-phone {
  position: absolute;
  right: 5%;
  bottom: 80px;
  width: min(286px, 25vw);
  padding: 9px;
  border: 2px solid rgba(255, 255, 255, 0.42);
  border-radius: 28px;
  background: #111820;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.45);
  transform: rotate(3deg);
}

.hero-phone img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: 19px;
}

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

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

.trust-item {
  padding: 24px 18px;
  text-align: center;
}

.trust-item strong {
  display: block;
  color: var(--sky-dark);
  font-size: 24px;
}

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

.section {
  padding: 84px 0;
}

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

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

.section-kicker {
  margin-bottom: 7px;
  color: var(--green);
  font-size: 13px;
  font-weight: 800;
}

.section-link {
  color: var(--sky-dark);
  font-weight: 800;
}

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

.feature {
  min-height: 240px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.feature:nth-child(2) {
  border-top: 4px solid var(--green);
}

.feature:nth-child(3) {
  border-top: 4px solid var(--coral);
}

.feature:nth-child(1),
.feature:nth-child(4) {
  border-top: 4px solid var(--sky);
}

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

.feature h3 {
  margin: 44px 0 12px;
  font-size: 21px;
}

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

.screens-section {
  overflow: hidden;
  color: var(--white);
  background: #17212b;
}

.screens-section .section-kicker,
.screens-section .section-link {
  color: #66d2ff;
}

.screen-track {
  display: grid;
  grid-template-columns: repeat(3, minmax(230px, 315px));
  justify-content: center;
  gap: 28px;
}

.screen-figure {
  margin: 0;
}

.screen-figure img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border: 8px solid #263644;
  border-radius: 26px;
  box-shadow: 0 24px 42px rgba(0, 0, 0, 0.28);
}

.screen-figure figcaption {
  margin-top: 15px;
  color: #d7e6eb;
  font-size: 14px;
}

.journey-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.journey-card {
  position: relative;
  min-height: 270px;
  overflow: hidden;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.journey-card:first-child {
  background: #eaf8fd;
}

.journey-card:last-child {
  background: #eef9f2;
}

.journey-card h3 {
  margin: 0 0 12px;
  font-size: 26px;
}

.journey-card ul {
  margin: 18px 0 26px;
  padding-left: 20px;
  color: var(--ink-soft);
}

.text-link {
  color: var(--sky-dark);
  font-weight: 900;
}

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

.review {
  margin: 0;
  padding: 26px;
  border-left: 4px solid var(--sun);
  background: var(--white);
  box-shadow: 0 12px 28px rgba(23, 33, 43, 0.07);
}

.review p {
  margin: 0 0 20px;
}

.review cite {
  color: var(--ink-soft);
  font-size: 14px;
  font-style: normal;
}

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

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

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

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  top: 13px;
  right: 20px;
  color: var(--sky-dark);
  font-size: 28px;
}

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

.faq-answer {
  padding: 0 22px 22px;
  color: var(--ink-soft);
}

.faq-answer p {
  margin: 0 0 12px;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

.cta-band {
  padding: 54px 0;
  color: var(--white);
  background: var(--sky-dark);
}

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.cta-inner h2 {
  margin: 0 0 6px;
  font-size: clamp(28px, 4vw, 42px);
}

.cta-detail {
  margin: 0;
  color: #d9f3fd;
}

.site-footer {
  padding: 46px 0 28px;
  color: #cbd8de;
  background: #111820;
}

.footer-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 30px;
  padding-bottom: 30px;
  border-bottom: 1px solid #30404c;
}

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

.footer-brand p {
  max-width: 520px;
  margin: 12px 0 0;
  color: #9fb0ba;
  font-size: 14px;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

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

.disclaimer {
  margin: 24px 0 8px;
  color: #9fb0ba;
  font-size: 13px;
}

.copyright {
  margin: 0;
  font-size: 13px;
}

.page-hero {
  padding: 76px 0 64px;
  color: var(--white);
  background: #17212b url("../images/brand-panorama.webp") center / cover no-repeat;
}

.page-hero-inner {
  max-width: 780px;
  padding: 36px;
  border-left: 6px solid var(--sun);
  background: rgba(17, 24, 32, 0.88);
}

.breadcrumbs {
  margin-bottom: 18px;
  color: #b9d8e3;
  font-size: 14px;
}

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

.page-hero h1 {
  margin: 0 0 14px;
  font-size: clamp(36px, 5vw, 58px);
  line-height: 1.16;
  letter-spacing: 0;
}

.page-hero p {
  margin: 0;
  color: #dcecf1;
}

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

.article-section {
  padding: 32px 0;
  border-bottom: 1px solid var(--line);
}

.article-section:first-child {
  padding-top: 0;
}

.article-section h2 {
  margin: 0 0 20px;
  font-size: 30px;
  line-height: 1.3;
}

.article-section h3 {
  margin: 25px 0 10px;
  font-size: 21px;
}

.article-section p {
  margin: 0 0 15px;
  color: #3f505d;
}

.article-section ul,
.article-section ol {
  color: #3f505d;
}

.step-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: steps;
}

.step {
  position: relative;
  padding: 0 0 38px 74px;
  counter-increment: steps;
}

.step::before {
  content: counter(steps, decimal-leading-zero);
  position: absolute;
  top: 0;
  left: 0;
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--white);
  background: var(--sky-dark);
  font-weight: 900;
}

.step::after {
  content: "";
  position: absolute;
  top: 58px;
  bottom: 5px;
  left: 26px;
  width: 2px;
  background: var(--line);
}

.step:last-child::after {
  display: none;
}

.step h3 {
  margin-top: 0;
}

.step-media {
  margin-top: 20px;
}

.step-media img {
  width: 260px;
  max-width: 400px;
  height: auto;
  border: 6px solid #263644;
  border-radius: 22px;
}

.callout {
  margin: 22px 0;
  padding: 20px 22px;
  border-left: 4px solid var(--green);
  background: #edf9f3;
}

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

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

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

.side-nav a {
  display: block;
  padding: 9px 0;
  border-bottom: 1px solid #edf2f4;
  color: var(--ink-soft);
  font-size: 14px;
}

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

.side-nav .button {
  margin-top: 18px;
  color: var(--white);
}

.related-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.related-link {
  padding: 18px;
  border: 1px solid var(--line);
  background: var(--white);
  font-weight: 800;
}

.related-link:hover {
  border-color: var(--sky);
  color: var(--sky-dark);
}

@media (max-width: 900px) {
  .menu-button {
    display: grid;
    place-items: center;
  }

  .nav-links {
    position: fixed;
    top: 72px;
    right: 0;
    left: 0;
    display: none;
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    padding: 18px 20px 24px;
    border-bottom: 1px solid var(--line);
    background: var(--paper);
    box-shadow: var(--shadow);
  }

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

  .nav-links a:not(.button) {
    padding: 12px 4px;
  }

  .hero {
    min-height: 690px;
    background-image: linear-gradient(180deg, rgba(17, 29, 39, 0.92) 0%, rgba(17, 29, 39, 0.78) 72%, rgba(17, 29, 39, 0.65) 100%), url("../images/brand-scene.webp");
  }

  .hero .container {
    align-items: flex-start;
  }

  .hero-copy {
    width: 100%;
    padding-top: 64px;
  }

  .hero-phone {
    right: 8%;
    bottom: -190px;
    width: 210px;
  }

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

  .screen-track {
    justify-content: start;
    overflow-x: auto;
    padding-bottom: 18px;
    scroll-snap-type: x mandatory;
  }

  .screen-figure {
    scroll-snap-align: start;
  }

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

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

@media (max-width: 620px) {
  .container {
    width: min(calc(100% - 28px), var(--content));
  }

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

  .brand {
    font-size: 18px;
  }

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

  .nav-links {
    top: 66px;
  }

  .hero {
    min-height: 670px;
  }

  .hero h1 {
    font-size: 43px;
  }

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

  .hero-phone {
    right: 18px;
    bottom: 30px;
    width: 180px;
  }

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

  .trust-item {
    padding: 18px 8px;
  }

  .section {
    padding: 62px 0;
  }

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

  .feature-grid,
  .journey-grid,
  .review-grid,
  .related-links {
    grid-template-columns: 1fr;
  }

  .feature {
    min-height: 0;
  }

  .feature h3 {
    margin-top: 24px;
  }

  .screen-track {
    grid-template-columns: repeat(3, 250px);
  }

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

  .page-hero-inner {
    padding: 24px 20px;
  }

  .page-hero h1 {
    font-size: 37px;
  }

  .step {
    padding-left: 0;
    padding-top: 68px;
  }

  .step::after {
    display: none;
  }
}

@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;
  }
}