:root {
  --navy: #101426;
  --ink: #161a2c;
  --muted: #697085;
  --paper: #f7f8fb;
  --white: #ffffff;
  --line: #e4e7ef;
  --accent: #5558da;
  --accent-dark: #4042ba;
  --teal: #168e88;
  --danger: #b54747;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { min-height: 100vh; display: flex; flex-direction: column; color: var(--ink); background: var(--white); font-family: var(--font); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
.container { width: min(1180px, calc(100% - 64px)); margin: 0 auto; }

.utility { color: #d5d9e8; background: var(--navy); font-size: 12px; }
.utility-inner { min-height: 34px; display: flex; align-items: center; justify-content: space-between; }
.utility-note { display: inline-flex; align-items: center; gap: 8px; }
.utility-note i { width: 6px; height: 6px; display: inline-block; border-radius: 50%; background: #60d5bd; }
.utility-links { display: flex; gap: 22px; color: #aeb5ca; }
.utility-links a:hover { color: #fff; }

.site-header { position: sticky; top: 0; z-index: 10; background: rgba(255, 255, 255, .96); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
.nav { height: 76px; display: flex; align-items: center; gap: 42px; }
.brand { min-width: 218px; display: inline-flex; align-items: center; gap: 11px; }
.brand img { width: 35px; height: 42px; object-fit: contain; }
.brand-copy { display: flex; flex-direction: column; line-height: 1.18; }
.brand-name { color: var(--ink); font-size: 19px; font-weight: 750; }
.brand-desc { margin-top: 4px; color: var(--muted); font-size: 11px; }
.nav-links { flex: 1; display: flex; align-items: center; gap: 32px; }
.nav-links a, .nav-help { color: #4f566b; font-size: 14px; }
.nav-links a:hover, .nav-help:hover { color: var(--accent); }
.nav-actions { display: flex; align-items: center; gap: 18px; }
.nav-download, .button-primary { display: inline-flex; align-items: center; justify-content: center; gap: 7px; color: #fff; background: var(--accent); border-radius: 5px; font-weight: 650; transition: .18s ease; }
.nav-download { padding: 10px 17px; font-size: 14px; }
.nav-download:hover, .button-primary:hover { background: var(--accent-dark); transform: translateY(-1px); }
.menu-toggle { display: none; padding: 8px; color: var(--ink); background: transparent; border: 0; cursor: pointer; }

.page-hero { background: var(--paper); border-bottom: 1px solid var(--line); }
.page-hero-inner { min-height: 274px; display: flex; flex-direction: column; justify-content: center; padding: 54px 0 58px; }
.breadcrumb { display: flex; align-items: center; gap: 9px; color: #969db0; font-size: 12px; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .current { color: #535b70; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; color: var(--accent); font-size: 12px; font-weight: 750; letter-spacing: .14em; text-transform: uppercase; }
.eyebrow::before { width: 23px; height: 2px; content: ""; background: var(--accent); }
.page-hero h1 { max-width: 760px; margin-top: 17px; color: var(--ink); font-size: 46px; font-weight: 750; letter-spacing: -.04em; line-height: 1.16; }
.page-hero .lead { max-width: 650px; margin-top: 14px; color: var(--muted); font-size: 16px; line-height: 1.85; }

.page-main { flex: 1; }
.page-section { padding: 76px 0 104px; }
.section-kicker { margin-bottom: 12px; color: var(--accent); font-size: 12px; font-weight: 750; letter-spacing: .12em; text-transform: uppercase; }
.section-title { color: var(--ink); font-size: 25px; font-weight: 720; letter-spacing: -.025em; line-height: 1.3; }
.section-intro { max-width: 610px; margin-top: 9px; color: var(--muted); font-size: 14px; }

.download-layout { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(340px, .92fr); gap: 70px; align-items: start; }
.download-copy { padding-top: 4px; }
.download-copy h2 { max-width: 540px; color: var(--ink); font-size: 34px; line-height: 1.25; letter-spacing: -.035em; }
.download-copy > p { max-width: 540px; margin-top: 16px; color: var(--muted); font-size: 15px; line-height: 1.9; }
.download-facts { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 38px; border-top: 1px solid var(--line); }
.download-fact { padding: 18px 18px 0 0; border-right: 1px solid var(--line); }
.download-fact + .download-fact { padding-left: 18px; }
.download-fact:last-child { border-right: 0; }
.download-fact strong { display: block; color: var(--ink); font-size: 15px; }
.download-fact span { display: block; margin-top: 3px; color: var(--muted); font-size: 12px; }
.download-panel { position: relative; padding: 30px; background: var(--navy); color: #fff; box-shadow: 0 24px 56px rgba(16, 20, 38, .16); }
.download-panel::before { position: absolute; top: 0; right: 0; width: 70px; height: 4px; content: ""; background: #60d5bd; }
.panel-label { color: #8d91ff; font-size: 12px; font-weight: 750; letter-spacing: .12em; text-transform: uppercase; }
.download-panel h2 { margin-top: 18px; font-size: 23px; font-weight: 700; }
.version { margin-top: 5px; color: #aab1c4; font-size: 13px; }
.download-actions { display: grid; gap: 10px; margin-top: 25px; }
.download-actions a { min-height: 47px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; padding: 0 17px; border: 1px solid transparent; border-radius: 4px; font-size: 14px; font-weight: 650; }
.download-actions .main-download { color: var(--navy); background: #fff; }
.download-actions .main-download:hover { color: var(--accent-dark); background: #f0f1ff; }
.download-actions .backup-download { color: #d5d9e8; border-color: #43495e; }
.download-actions .backup-download:hover { color: #fff; border-color: #8d91ff; }
.download-note { margin-top: 22px; padding-top: 17px; color: #aab1c4; border-top: 1px solid #343950; font-size: 12px; line-height: 1.8; }
.steps-section { margin-top: 90px; }
.step-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 29px; border-top: 1px solid var(--line); }
.step-item { min-height: 170px; padding: 25px 30px 18px 0; border-right: 1px solid var(--line); }
.step-item + .step-item { padding-left: 30px; }
.step-item:last-child { border-right: 0; }
.step-number { color: var(--accent); font-family: Georgia, serif; font-size: 24px; }
.step-item h3 { margin-top: 20px; font-size: 17px; }
.step-item p { margin-top: 7px; color: var(--muted); font-size: 13px; line-height: 1.8; }
.notice { margin-top: 31px; padding: 16px 18px; color: #566078; background: #f1f7f6; border-left: 3px solid var(--teal); font-size: 13px; }

.help-layout { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 72px; align-items: start; }
.help-index { position: sticky; top: 106px; border-top: 1px solid var(--line); }
.help-index a { display: block; padding: 13px 0; color: #767e93; border-bottom: 1px solid var(--line); font-size: 13px; }
.help-index a:hover { color: var(--accent); }
.help-index a::before { margin-right: 10px; color: #a2a8b7; content: "0" counter(help); counter-increment: help; font-family: Georgia, serif; }
.help-index { counter-reset: help; }
.help-content { border-top: 1px solid var(--line); }
.help-section { padding: 27px 0 31px; border-bottom: 1px solid var(--line); }
.help-section h2 { display: flex; align-items: baseline; gap: 14px; color: var(--ink); font-size: 20px; line-height: 1.4; }
.help-section h2 .n { color: var(--accent); font-family: Georgia, serif; font-size: 20px; font-weight: 400; }
.help-section ol, .help-section ul { margin: 16px 0 0 26px; }
.help-section li { margin: 8px 0; padding-left: 4px; color: #50586d; font-size: 14px; }
.help-section li::marker { color: #9da4b5; }
.help-hint { margin-top: 18px; padding: 13px 16px; color: #3f6d68; background: #f1f7f6; border-left: 3px solid var(--teal); font-size: 13px; }
.help-hint.warn { color: #875353; background: #fbf3f3; border-left-color: #d17d7d; }
.qa { margin-top: 6px; }
.qa dt { margin-top: 20px; color: var(--ink); font-size: 14px; font-weight: 700; }
.qa dt:first-child { margin-top: 0; }
.qa dd { margin-top: 5px; color: var(--muted); font-size: 14px; line-height: 1.85; }
.text-link { color: var(--accent); border-bottom: 1px solid #c9cbf5; }
.text-link:hover { color: var(--accent-dark); }

.support-layout { display: grid; grid-template-columns: minmax(300px, .85fr) minmax(0, 1.15fr); gap: 70px; align-items: start; }
.support-visual { padding: 25px; background: var(--navy); color: #fff; }
.support-visual .panel-label { display: block; }
.support-visual h2 { margin-top: 18px; font-size: 24px; }
.support-visual .qr { display: block; width: min(100%, 245px); margin: 27px auto 5px; border: 7px solid #fff; }
.support-visual p { color: #aab1c4; font-size: 13px; line-height: 1.8; }
.support-details { border-top: 1px solid var(--line); }
.support-item { padding: 26px 0 29px; border-bottom: 1px solid var(--line); }
.support-item h2 { color: var(--ink); font-size: 20px; }
.support-item p { max-width: 580px; margin-top: 8px; color: var(--muted); font-size: 14px; line-height: 1.85; }
.support-item ol { margin: 13px 0 0 22px; }
.support-item li { margin: 5px 0; color: var(--muted); font-size: 13px; }
.mail { display: inline-block; margin-top: 11px; color: var(--accent); font-size: 19px; font-weight: 680; border-bottom: 1px solid #c9cbf5; }
.mail:hover { color: var(--accent-dark); }
.support-hours { margin-top: 28px; color: #566078; background: var(--paper); border-left: 3px solid var(--teal); padding: 15px 17px; font-size: 13px; }

.legal-layout { display: grid; grid-template-columns: 210px minmax(0, 780px); gap: 80px; align-items: start; }
.legal-aside { position: sticky; top: 106px; padding-top: 3px; }
.legal-aside .aside-title { color: var(--ink); font-size: 13px; font-weight: 700; }
.legal-aside p { margin-top: 10px; color: var(--muted); font-size: 12px; line-height: 1.8; }
.legal-aside a { display: block; margin-top: 20px; color: var(--accent); font-size: 13px; }
.legal-aside a:hover { color: var(--accent-dark); }
.legal-document { max-width: 780px; padding: 0 0 12px; }
.legal-document .meta { margin-bottom: 25px; color: #969db0; font-size: 13px; }
.legal-document > p, .legal-document li { color: #596176; font-size: 15px; line-height: 1.95; }
.legal-document > p { margin: 12px 0; }
.legal-document h2 { margin: 40px 0 13px; padding-top: 23px; color: var(--ink); border-top: 1px solid var(--line); font-size: 20px; line-height: 1.35; }
.legal-document ol, .legal-document ul { margin: 10px 0 13px 23px; }
.legal-document li { margin: 7px 0; padding-left: 4px; }
.legal-document strong { color: var(--ink); }
.legal-document code { padding: 2px 5px; color: #5558da; background: #f1f1ff; font-family: Consolas, monospace; font-size: 13px; }
.sign { margin-top: 32px !important; text-align: right; color: #858da0 !important; }

.site-footer { margin-top: auto; color: #aab1c4; background: var(--navy); }
.footer-main { display: grid; grid-template-columns: 1.8fr 1fr 1fr 1fr; gap: 60px; padding: 59px 0 48px; }
.footer-brand { display: inline-flex; align-items: center; gap: 10px; color: #fff; font-weight: 700; }
.footer-brand img { width: 30px; height: 35px; object-fit: contain; }
.footer-brand span { font-size: 17px; }
.footer-summary { max-width: 270px; margin-top: 14px; color: #8f97ad; font-size: 13px; line-height: 1.85; }
.site-footer h4 { color: #fff; font-size: 13px; font-weight: 650; }
.footer-links { margin-top: 12px; }
.footer-links a { display: block; padding: 4px 0; color: #969eb4; font-size: 13px; }
.footer-links a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #2d3349; }
.footer-bottom-inner { display: flex; justify-content: space-between; gap: 25px; padding: 18px 0 22px; color: #747d97; font-size: 12px; }
.footer-legal { display: flex; gap: 20px; }
.footer-legal a:hover { color: #fff; }

@media (max-width: 980px) {
  .container { width: min(100% - 42px, 760px); }
  .nav { gap: 20px; }
  .brand { min-width: 190px; }
  .nav-links { gap: 19px; }
  .nav-help { display: none; }
  .download-layout, .support-layout { grid-template-columns: 1fr; gap: 49px; }
  .download-panel { max-width: 650px; }
  .help-layout, .legal-layout { grid-template-columns: 1fr; gap: 35px; }
  .help-index { position: static; display: flex; flex-wrap: wrap; gap: 0 25px; border-top: 0; }
  .help-index a { padding: 8px 0; border-bottom: 0; }
  .legal-aside { position: static; padding-bottom: 4px; border-bottom: 1px solid var(--line); }
  .legal-aside a { display: inline-block; margin: 13px 20px 0 0; }
  .footer-main { gap: 28px; }
}

@media (max-width: 680px) {
  .container { width: min(100% - 32px, 540px); }
  .utility-links { display: none; }
  .utility-inner { min-height: 31px; }
  .site-header { position: relative; }
  .nav { height: 68px; justify-content: space-between; }
  .brand { min-width: 0; }
  .brand img { width: 30px; height: 37px; }
  .brand-name { font-size: 17px; }
  .nav-links, .nav-actions { display: none; }
  .menu-toggle { display: block; }
  .site-header.menu-open .nav-links { position: absolute; top: 68px; right: 0; left: 0; display: flex; flex-direction: column; align-items: stretch; gap: 0; padding: 9px 145px 13px 16px; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 12px 22px rgba(16, 20, 38, .08); }
  .site-header.menu-open .nav-links a { padding: 11px 0; border-bottom: 1px solid #f0f1f5; }
  .site-header.menu-open .nav-actions { position: absolute; top: 68px; right: 16px; z-index: 2; display: flex; }
  .site-header.menu-open .nav-download { padding: 8px 13px; font-size: 12px; }
  .page-hero-inner { min-height: 235px; padding: 42px 0 45px; }
  .page-hero h1 { margin-top: 15px; font-size: 36px; }
  .page-hero .lead { margin-top: 11px; font-size: 14px; }
  .page-section { padding: 54px 0 75px; }
  .download-copy h2 { font-size: 29px; }
  .download-facts { grid-template-columns: 1fr; }
  .download-fact, .download-fact + .download-fact { padding: 13px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .download-fact:last-child { border-bottom: 0; }
  .download-panel { padding: 24px 20px; }
  .steps-section { margin-top: 65px; }
  .step-grid { grid-template-columns: 1fr; }
  .step-item, .step-item + .step-item { min-height: 0; padding: 21px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .step-item:last-child { border-bottom: 0; }
  .step-item h3 { margin-top: 9px; }
  .help-index { display: block; }
  .help-index a { padding: 10px 0; border-bottom: 1px solid var(--line); }
  .help-section h2 { font-size: 18px; }
  .support-visual { padding: 21px; }
  .support-details { margin-top: -1px; }
  .legal-document > p, .legal-document li { font-size: 14px; }
  .legal-document h2 { margin-top: 30px; padding-top: 20px; font-size: 18px; }
  .footer-main { grid-template-columns: 1fr 1fr; gap: 37px 24px; padding: 48px 0 38px; }
  .footer-brand-block { grid-column: 1 / -1; }
  .footer-bottom-inner { display: block; line-height: 1.8; }
  .footer-legal { margin-top: 4px; }
}