:root {
  --bg: #f6f9ff;
  --paper: rgba(255, 255, 255, .82);
  --paper-strong: #ffffff;
  --text: #102942;
  --muted: #52677e;
  --line: rgba(36, 86, 145, .12);
  --blue: #2868ef;
  --blue-dark: #0b2946;
  --sky: #16b7f2;
  --soft-blue: #eaf2ff;
  --green: #2bcf78;
  --shadow: 0 24px 70px rgba(20, 54, 96, .12);
  --radius: 28px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
  color: var(--text);
  background:
    linear-gradient(rgba(43, 110, 215, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43, 110, 215, .055) 1px, transparent 1px),
    radial-gradient(circle at 84% 18%, rgba(75, 112, 255, .13), transparent 34rem),
    radial-gradient(circle at 16% 12%, rgba(42, 184, 242, .13), transparent 32rem),
    var(--bg);
  background-size: 40px 40px, 40px 40px, auto, auto, auto;
  line-height: 1.75;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(90deg, rgba(255,255,255,.6), transparent 18%, transparent 82%, rgba(255,255,255,.6));
  z-index: -1;
}

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

svg {
  display: block;
}

.container {
  width: min(1280px, calc(100% - 42px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .76);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  min-height: 86px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 26px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-icon {
  width: 42px;
  height: 42px;
  border-radius: 13px;
  display: grid;
  place-items: center;
  color: #fff;
  background: linear-gradient(135deg, #5863ff, #2a67ef);
  box-shadow: 0 12px 26px rgba(40, 104, 239, .25);
}

.brand-icon svg {
  width: 30px;
  height: 30px;
  fill: none;
  stroke: currentColor;
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.brand-text strong {
  display: block;
  font-size: 27px;
  line-height: 1;
  letter-spacing: -.04em;
  color: #102942;
}

.brand-text em {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  font-style: normal;
  color: #6b7f95;
}

.nav {
  justify-self: center;
  display: flex;
  gap: 30px;
  align-items: center;
  font-weight: 800;
  color: #1d3148;
}

.nav a {
  position: relative;
  padding: 8px 0;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 3px;
  border-radius: 99px;
  background: var(--blue);
  transition: right .2s ease;
}

.nav a:hover,
.nav a.active {
  color: var(--blue);
}

.nav a:hover::after,
.nav a.active::after {
  right: 0;
}

.header-download {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 24px;
  color: #fff;
  font-weight: 900;
  border-radius: 999px;
  background: var(--blue-dark);
  box-shadow: 0 14px 28px rgba(7, 36, 65, .2);
}

.header-download svg,
.btn svg {
  width: 19px;
  height: 19px;
  fill: currentColor;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255,255,255,.7);
  padding: 10px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  margin: 5px 0;
  border-radius: 99px;
  background: var(--text);
}

.hero {
  padding: 70px 0 66px;
}

.hero-grid,
.download-hero-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 70px;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  padding: 0 18px;
  border-radius: 999px;
  color: var(--blue);
  font-weight: 900;
  background: rgba(40, 104, 239, .1);
  border: 1px solid rgba(40, 104, 239, .18);
}

.badge span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 5px rgba(43, 207, 120, .12);
}

.hero h1,
.download-hero h1 {
  margin: 22px 0 18px;
  font-size: clamp(50px, 7vw, 88px);
  line-height: .98;
  letter-spacing: -.08em;
  color: #081d34;
}

.hero h1::after {
  content: "多平台入口";
  display: block;
  width: max-content;
  max-width: 100%;
  background: linear-gradient(90deg, #1e58df, #6d3fe0);
  -webkit-background-clip: text;
  color: transparent;
}

.hero p,
.download-hero p {
  margin: 0;
  max-width: 650px;
  color: #40586f;
  font-size: 20px;
  font-weight: 500;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 30px;
}

.btn {
  min-height: 58px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 28px;
  border-radius: 999px;
  font-weight: 950;
  border: 1px solid transparent;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
  white-space: nowrap;
}

.btn:hover,
.header-download:hover,
.card-btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, #2770ff, #245bdd);
  box-shadow: 0 18px 34px rgba(40, 104, 239, .26);
}

.btn-soft {
  color: #142d46;
  background: rgba(255, 255, 255, .82);
  border-color: rgba(20, 70, 130, .08);
  box-shadow: 0 12px 28px rgba(20, 54, 96, .08);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.tag-row span {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  padding: 0 18px;
  border-radius: 999px;
  color: #28384a;
  background: rgba(255, 255, 255, .72);
  box-shadow: 0 10px 26px rgba(20, 54, 96, .07);
}

.hero-card,
.download-check-card {
  padding: 36px;
  border-radius: 34px;
  background: rgba(255, 255, 255, .84);
  border: 1px solid rgba(32, 76, 130, .08);
  box-shadow: var(--shadow);
}

.support-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 19px;
}

.support-title svg {
  width: 26px;
  height: 26px;
  fill: none;
  stroke: var(--blue);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.support-list {
  display: grid;
  gap: 14px;
  margin: 24px 0;
}

.support-list div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.support-list span {
  font-size: 19px;
  color: #1e354e;
  font-weight: 800;
}

.support-list em {
  font-size: 13px;
  color: #6a7d94;
  font-style: normal;
}

.status-pill {
  padding: 22px;
  border-radius: 999px;
  background: #edf3ff;
}

.status-pill strong {
  display: block;
  margin-bottom: 4px;
}

.status-pill span {
  color: #475f78;
}

.section {
  padding: 58px 0;
}

.section-title {
  margin-bottom: 30px;
}

.left-title {
  display: flex;
  align-items: center;
  gap: 14px;
}

.title-icon {
  width: 52px;
  height: 52px;
  flex: 0 0 52px;
  display: grid;
  place-items: center;
}

.title-icon svg {
  width: 44px;
  height: 44px;
  fill: none;
  stroke: #0b2946;
  stroke-width: 3.4;
  stroke-linecap: round;
  stroke-linejoin: round;
  filter: drop-shadow(0 5px 0 rgba(40,104,239,.08));
}

.rocket-icon svg {
  stroke: #136bf1;
}

.safe-icon svg {
  stroke: #20a56d;
}

.question-icon svg {
  stroke: #f0522f;
}

.section-title h2 {
  margin: 0;
  font-size: clamp(30px, 4.2vw, 48px);
  line-height: 1.18;
  letter-spacing: -.06em;
}

.section-title p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 17px;
}

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

.version-card,
.feature-grid article,
.prep-grid article,
.faq-grid details,
.intro-card,
.safety-card,
.tips-card,
.download-item {
  background: var(--paper);
  border: 1px solid rgba(37, 82, 140, .08);
  box-shadow: var(--shadow);
}

.version-card {
  min-height: 358px;
  padding: 30px;
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
}

.version-icons {
  display: flex;
  gap: 10px;
  min-height: 56px;
}

.version-icons svg,
.download-icon svg {
  width: 46px;
  height: 46px;
  fill: none;
  stroke: #111f31;
  stroke-width: 3.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.version-icons svg:nth-child(2) {
  stroke: var(--blue);
}

.version-card h3 {
  margin: 26px 0 12px;
  font-size: 30px;
  line-height: 1.15;
  letter-spacing: -.04em;
}

.mini-label {
  width: fit-content;
  padding: 3px 12px;
  border-radius: 99px;
  color: #24405f;
  font-weight: 800;
  background: #edf3ff;
  font-size: 13px;
}

.version-card p {
  margin: 22px 0 24px;
  color: #314b65;
  flex: 1;
}

.card-btn {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  color: #fff;
  background: var(--blue-dark);
  font-weight: 950;
  box-shadow: 0 14px 26px rgba(7, 36, 65, .14);
  transition: transform .2s ease;
}

.features-section,
.prep-section {
  padding-top: 40px;
}

.feature-grid,
.prep-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-grid article,
.prep-grid article {
  min-height: 230px;
  padding: 30px;
  border-radius: var(--radius);
}

.feature-grid span,
.prep-grid span {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  font-size: 24px;
  font-weight: 950;
  background: var(--blue);
}

.feature-grid h3,
.prep-grid h3 {
  margin: 22px 0 8px;
  font-size: 24px;
  line-height: 1.2;
}

.feature-grid p,
.prep-grid p {
  margin: 0;
  color: #405970;
}

.tips-card,
.safety-card {
  padding: 36px;
  border-radius: 34px;
}

.tips-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}

.tips-head h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 42px);
  letter-spacing: -.05em;
}

.tips-head p {
  margin: 6px 0 0;
  color: var(--muted);
}

.tips-grid,
.safety-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.tips-grid div,
.safety-grid p {
  margin: 0;
  padding: 22px;
  border-radius: 22px;
  background: rgba(239, 245, 255, .72);
  border: 1px solid rgba(37, 82, 140, .08);
}

.tips-grid strong {
  display: block;
  margin-bottom: 6px;
  font-size: 18px;
}

.tips-grid p,
.safety-grid p {
  color: #405970;
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.faq-grid details {
  border-radius: 26px;
  overflow: hidden;
}

.faq-grid summary {
  cursor: pointer;
  padding: 22px 26px 10px;
  font-weight: 950;
  list-style: none;
}

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

.faq-grid summary::before {
  content: "◆";
  color: var(--blue);
  margin-right: 8px;
}

.faq-grid details p {
  margin: 0;
  padding: 0 26px 22px;
  color: #405970;
}

.intro-section {
  padding-top: 34px;
}

.intro-card {
  text-align: center;
  padding: 42px 50px;
  border-radius: 34px;
}

.intro-card h2 {
  margin: 0 0 16px;
  font-size: clamp(28px, 4vw, 44px);
  letter-spacing: -.05em;
}

.intro-card p {
  max-width: 920px;
  margin: 0 auto 26px;
  color: #405970;
  font-size: 17px;
}

.site-footer {
  margin-top: 20px;
  border-top: 1px solid var(--line);
  background: rgba(255,255,255,.58);
}

.footer-inner {
  min-height: 86px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  color: #66788d;
}

.footer-inner nav {
  display: flex;
  flex-wrap: wrap;
  gap: 26px;
  color: var(--blue);
  font-weight: 800;
}

.download-hero {
  padding: 70px 0 52px;
}

.download-check-card strong {
  display: block;
  font-size: 23px;
  margin-bottom: 16px;
}

.download-check-card ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.download-check-card li {
  position: relative;
  padding-left: 24px;
  color: #405970;
}

.download-check-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .75em;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--green);
}

.download-list {
  display: grid;
  gap: 18px;
}

.download-item {
  display: grid;
  grid-template-columns: 70px 1fr auto;
  gap: 24px;
  align-items: center;
  padding: 28px;
  border-radius: 28px;
  scroll-margin-top: 112px;
}

.download-icon {
  width: 64px;
  height: 64px;
  border-radius: 20px;
  display: grid;
  place-items: center;
  background: #eef5ff;
}

.download-icon svg {
  width: 38px;
  height: 38px;
  stroke: var(--blue);
}

.download-body span {
  color: var(--blue);
  font-size: 13px;
  font-weight: 950;
}

.download-body h3 {
  margin: 4px 0 8px;
  font-size: 30px;
  letter-spacing: -.04em;
}

.download-body p {
  margin: 0 0 14px;
  color: #405970;
}

.info-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.info-row em {
  padding: 6px 12px;
  border-radius: 999px;
  background: #edf3ff;
  color: #405970;
  font-style: normal;
  font-size: 13px;
}

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

@media (max-width: 1140px) {
  .header-inner {
    grid-template-columns: auto auto auto;
  }

  .nav-toggle {
    display: block;
    justify-self: end;
  }

  .nav {
    position: absolute;
    left: 21px;
    right: 21px;
    top: 76px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px;
    border-radius: 22px;
    background: rgba(255,255,255,.96);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
  }

  body.nav-open .nav {
    display: flex;
  }

  .nav a {
    padding: 12px;
  }

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

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

@media (max-width: 860px) {
  .container {
    width: min(100% - 28px, 1280px);
  }

  .header-inner {
    min-height: 72px;
    gap: 12px;
  }

  .brand-text strong {
    font-size: 24px;
  }

  .brand-text em {
    display: none;
  }

  .header-download {
    display: none;
  }

  .hero,
  .download-hero {
    padding: 46px 0 38px;
  }

  .hero h1,
  .download-hero h1 {
    font-size: 48px;
  }

  .hero h1::after {
    width: auto;
  }

  .hero p,
  .download-hero p {
    font-size: 16px;
  }

  .hero-card,
  .download-check-card,
  .tips-card,
  .safety-card,
  .intro-card {
    padding: 24px;
    border-radius: 26px;
  }

  .version-grid,
  .feature-grid,
  .prep-grid,
  .tips-grid,
  .safety-grid,
  .faq-grid {
    grid-template-columns: 1fr;
  }

  .download-item {
    grid-template-columns: 1fr;
  }

  .download-item .btn {
    width: 100%;
  }

  .left-title,
  .tips-head {
    align-items: flex-start;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    padding: 24px 0;
  }

  .footer-inner nav {
    gap: 16px;
  }
}

@media (max-width: 520px) {
  .brand-icon {
    width: 38px;
    height: 38px;
  }

  .hero h1,
  .download-hero h1 {
    font-size: 41px;
  }

  .hero-actions,
  .hero-actions .btn {
    width: 100%;
  }

  .support-list div {
    align-items: flex-start;
    flex-direction: column;
    gap: 2px;
  }

  .status-pill {
    border-radius: 22px;
  }

  .version-card {
    min-height: auto;
  }
}