:root {
  --paper: #f5f7f9;
  --white: #ffffff;
  --navy: #0c2d4a;
  --navy-deep: #071f34;
  --steel: #416982;
  --line: #c8d2da;
  --line-dark: #8fa3b2;
  --ink: #17242d;
  --muted: #5c6b75;
  --pale: #e9eff3;
  --focus: #b33a32;
  --max: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
button, input { font: inherit; }
button { color: inherit; }
:focus-visible { outline: 3px solid #6d91aa; outline-offset: 3px; }
.wrap { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }
.skip-link { position: fixed; left: 12px; top: -60px; z-index: 100; background: var(--white); padding: 10px 16px; border: 1px solid var(--navy); }
.skip-link:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.98);
  border-bottom: 2px solid var(--navy);
}
.nav-row { min-height: 70px; display: flex; align-items: center; gap: 30px; }
.logo { display: flex; align-items: center; gap: 11px; font-weight: 800; color: var(--navy-deep); letter-spacing: .03em; }
.logo-mark { width: 34px; height: 34px; display: grid; place-items: center; color: var(--white); background: var(--navy); font-family: Georgia, serif; font-size: 20px; }
.main-nav { display: flex; align-items: center; gap: 25px; margin-left: auto; }
.main-nav a { min-height: 70px; display: flex; align-items: center; border-bottom: 3px solid transparent; font-size: 14px; }
.main-nav a:hover, .main-nav a[aria-current="page"] { color: var(--navy); border-bottom-color: var(--steel); }
.nav-download { min-width: 112px; min-height: 40px !important; justify-content: center; padding: 0 18px; color: var(--white) !important; background: var(--navy); border: 1px solid var(--navy) !important; }
.menu-toggle { display: none; margin-left: auto; width: 44px; height: 40px; border: 1px solid var(--line-dark); background: var(--white); }

.directory-rail {
  border-bottom: 1px solid var(--line);
  background: var(--pale);
}
.directory-inner { min-height: 43px; display: flex; align-items: center; overflow-x: auto; white-space: nowrap; font-size: 12px; color: var(--muted); }
.directory-label { align-self: stretch; display: flex; align-items: center; padding-right: 22px; margin-right: 22px; color: var(--white); background: var(--steel); box-shadow: -600px 0 0 var(--steel); letter-spacing: .12em; }
.directory-inner a, .directory-inner span:not(.directory-label) { padding: 0 17px; border-right: 1px solid var(--line); }

.hero { padding: 64px 0 54px; background: var(--white); border-bottom: 1px solid var(--line-dark); }
.hero-grid { display: grid; grid-template-columns: 1.06fr .94fr; gap: 62px; align-items: center; }
.hero-copy { min-width: 0; }
.eyebrow { display: flex; align-items: center; gap: 12px; margin: 0 0 18px; color: var(--steel); font-size: 13px; font-weight: 700; letter-spacing: .08em; }
.eyebrow::before { content: ""; width: 44px; border-top: 2px solid var(--steel); }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 22px; color: var(--navy-deep); font-family: "Microsoft YaHei", sans-serif; font-size: clamp(38px, 5.2vw, 68px); line-height: 1.13; letter-spacing: -.04em; }
.hero-lead { max-width: 680px; margin-bottom: 30px; color: var(--muted); font-size: 18px; }
.hero-actions, .inline-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  min-width: 142px;
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  border: 1px solid var(--navy);
  background: var(--navy);
  color: var(--white);
  font-weight: 700;
  white-space: nowrap;
  word-break: keep-all;
  writing-mode: horizontal-tb;
}
.btn:hover { background: var(--navy-deep); }
.btn-secondary { background: transparent; color: var(--navy); }
.btn-secondary:hover { background: var(--pale); }
.hero-note { margin-top: 20px; color: var(--muted); font-size: 13px; }
.hero-media { position: relative; align-self: center; min-width: 0; height: auto; border: 1px solid var(--line-dark); background: #eef3f6; }
.hero-media::before { content: "项目资料目录 / 权限范围"; display: block; padding: 9px 13px; color: var(--white); background: var(--navy); font-size: 12px; letter-spacing: .08em; }

.section { padding: 78px 0; border-bottom: 1px solid var(--line); }
.section-white { background: var(--white); }
.section-head { display: grid; grid-template-columns: 180px 1fr; gap: 36px; align-items: end; margin-bottom: 38px; }
.section-index { color: var(--steel); font-size: 12px; letter-spacing: .16em; text-transform: uppercase; }
.section-title { margin: 0; color: var(--navy-deep); font-size: clamp(28px, 3.2vw, 42px); line-height: 1.25; }
.section-intro { max-width: 760px; margin: 12px 0 0; color: var(--muted); }

.flow-line { display: grid; grid-template-columns: repeat(4, 1fr); margin-bottom: 36px; border-top: 2px solid var(--steel); }
.flow-step { position: relative; padding: 16px 12px 0 0; color: var(--muted); font-size: 13px; }
.flow-step::before { content: ""; position: absolute; top: -6px; left: 0; width: 10px; height: 10px; background: var(--white); border: 2px solid var(--steel); }
.flow-step strong { display: block; color: var(--ink); font-size: 15px; }

.feature-ledger { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line-dark); border-left: 1px solid var(--line-dark); }
.feature-item { min-height: 210px; padding: 28px; background: var(--white); border-right: 1px solid var(--line-dark); border-bottom: 1px solid var(--line-dark); }
.feature-code { display: block; margin-bottom: 28px; color: var(--steel); font: 12px/1 Consolas, monospace; }
.feature-item h3 { margin-bottom: 10px; color: var(--navy); font-size: 21px; }
.feature-item p { margin: 0; color: var(--muted); font-size: 14px; }

.download-grid { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line-dark); }
.download-item { padding: 28px 22px; background: var(--white); border-right: 1px solid var(--line-dark); }
.download-item:last-child { border-right: 0; }
.platform-symbol { width: 42px; height: 42px; display: grid; place-items: center; margin-bottom: 34px; color: var(--white); background: var(--steel); font-weight: 800; }
.download-item h3 { margin-bottom: 4px; font-size: 20px; }
.download-meta { min-height: 50px; color: var(--muted); font-size: 13px; }
.download-item .btn { width: 100%; min-width: 126px; }

.scenario-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 0; border: 1px solid var(--line-dark); background: var(--white); }
.scenario-tabs { display: flex; flex-direction: column; border-right: 1px solid var(--line-dark); }
.scenario-tab { flex: 1; min-height: 92px; padding: 20px 26px; text-align: left; border: 0; border-bottom: 1px solid var(--line); background: var(--white); cursor: pointer; }
.scenario-tab:last-child { border-bottom: 0; }
.scenario-tab[aria-selected="true"] { color: var(--white); background: var(--navy); }
.scenario-panel { display: none; grid-template-columns: 1fr 230px; gap: 32px; align-items: center; padding: 34px; }
.scenario-panel.active { display: grid; }
.scenario-panel img { width: 100%; height: 200px; display: block; object-fit: contain; }
.scenario-panel ul { padding-left: 20px; margin: 18px 0 0; }

.review-list { border-top: 2px solid var(--navy); }
.review-item { display: grid; grid-template-columns: 180px 1fr 180px; align-items: center; gap: 28px; padding: 26px 0; border-bottom: 1px solid var(--line-dark); }
.review-person { display: flex; align-items: center; gap: 12px; }
.avatar { width: 46px; height: 46px; display: grid; place-items: center; color: var(--white); background: var(--steel); border-radius: 50%; font-weight: 800; }
.review-person strong, .review-person span { display: block; }
.review-person span, .identity { color: var(--muted); font-size: 13px; }
.review-text { margin: 0; }
.identity { justify-self: end; padding: 5px 10px; border: 1px solid var(--line-dark); }

.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); align-items: stretch; border: 1px solid var(--line-dark); background: var(--white); }
.plan { padding: 34px 30px; border-right: 1px solid var(--line-dark); }
.plan:last-child { border-right: 0; }
.plan.featured { margin: -14px 0; padding-top: 48px; color: var(--white); background: var(--navy); border: 0; }
.plan-kicker { color: var(--steel); font-size: 12px; letter-spacing: .12em; }
.plan.featured .plan-kicker, .plan.featured .plan-note { color: #c8d9e4; }
.plan h3 { margin: 11px 0 8px; font-size: 26px; }
.plan-price { margin-bottom: 24px; font-size: 30px; font-weight: 800; }
.plan-price small { font-size: 13px; font-weight: 400; }
.plan ul { min-height: 180px; padding-left: 20px; }
.plan-note { min-height: 48px; color: var(--muted); font-size: 13px; }
.plan.featured .btn { color: var(--navy); background: var(--white); border-color: var(--white); }

.faq-list { border-top: 2px solid var(--navy); }
.faq-item { border-bottom: 1px solid var(--line-dark); }
.faq-question { width: 100%; display: flex; justify-content: space-between; gap: 24px; padding: 22px 4px; text-align: left; border: 0; background: transparent; cursor: pointer; font-weight: 700; }
.faq-question span:last-child { color: var(--steel); font-size: 22px; }
.faq-answer { display: none; max-width: 900px; padding: 0 38px 23px 4px; color: var(--muted); }
.faq-item.open .faq-answer { display: block; }

.site-footer { color: #d9e2e8; background: var(--navy-deep); }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(4, 1fr); gap: 36px; padding: 58px 0 42px; }
.footer-brand p { max-width: 290px; color: #aebfc9; font-size: 14px; }
.footer-col h3 { color: var(--white); font-size: 14px; }
.footer-col a, .footer-col span { display: block; margin: 9px 0; color: #aebfc9; font-size: 13px; }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; padding: 18px 0; border-top: 1px solid #335066; color: #94a9b6; font-size: 12px; }

.page-hero { padding: 56px 0 48px; background: var(--white); border-bottom: 1px solid var(--line-dark); }
.page-hero-grid { display: grid; grid-template-columns: minmax(0,1fr) 410px; gap: 64px; align-items: center; }
.page-hero h1 { max-width: 760px; font-size: clamp(36px, 4.5vw, 58px); }
.page-hero-media { align-self: center; border-left: 1px solid var(--line-dark); }
.page-hero-media img { display: block; width: 100%; height: auto; object-fit: contain; }
.notice-strip { padding: 16px 0; color: var(--muted); background: var(--pale); border-bottom: 1px solid var(--line); font-size: 14px; }

.download-table { border: 1px solid var(--line-dark); background: var(--white); }
.download-row { display: grid; grid-template-columns: 180px 1fr 190px; align-items: center; min-height: 116px; border-bottom: 1px solid var(--line-dark); }
.download-row:last-child { border-bottom: 0; }
.download-os { align-self: stretch; display: flex; align-items: center; gap: 13px; padding: 22px; color: var(--white); background: var(--navy); }
.download-desc { padding: 20px 28px; }
.download-desc h2 { margin-bottom: 4px; font-size: 20px; }
.download-desc p { margin: 0; color: var(--muted); font-size: 13px; }
.download-action { padding: 20px; border-left: 1px solid var(--line); }

.guide-grid { display: grid; grid-template-columns: repeat(3,1fr); border: 1px solid var(--line-dark); }
.guide-step { padding: 28px; background: var(--white); border-right: 1px solid var(--line-dark); }
.guide-step:last-child { border-right: 0; }
.guide-step b { display: block; margin-bottom: 28px; color: var(--steel); font: 13px Consolas, monospace; }
.compatibility { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--line-dark); background: var(--white); }
.compat-copy { padding: 36px; }
.compat-copy dl { display: grid; grid-template-columns: 110px 1fr; margin: 20px 0 0; }
.compat-copy dt, .compat-copy dd { padding: 10px 0; border-bottom: 1px solid var(--line); }
.compat-copy dd { margin: 0; color: var(--muted); }
.compatibility img { width: 100%; height: 100%; min-height: 330px; object-fit: contain; border-left: 1px solid var(--line-dark); }

.help-shell { display: grid; grid-template-columns: 245px 1fr; gap: 44px; align-items: start; }
.help-sidebar { position: sticky; top: 91px; background: var(--white); border: 1px solid var(--line-dark); }
.help-sidebar h2 { margin: 0; padding: 17px 20px; color: var(--white); background: var(--navy); font-size: 15px; }
.help-sidebar a { display: block; padding: 14px 20px; border-bottom: 1px solid var(--line); font-size: 14px; }
.help-sidebar a:last-child { border-bottom: 0; }
.help-content section { scroll-margin-top: 100px; padding: 0 0 48px; margin-bottom: 48px; border-bottom: 1px solid var(--line-dark); }
.help-content h2 { color: var(--navy); font-size: 29px; }
.help-content h3 { margin: 26px 0 8px; font-size: 18px; }
.help-content p, .help-content li { color: var(--muted); }
.help-content img { display: block; width: min(100%, 620px); margin-top: 24px; border: 1px solid var(--line-dark); }
.process-list { counter-reset: steps; padding: 0; list-style: none; border-top: 1px solid var(--line-dark); }
.process-list li { position: relative; padding: 17px 18px 17px 70px; border-bottom: 1px solid var(--line); }
.process-list li::before { counter-increment: steps; content: counter(steps, decimal-leading-zero); position: absolute; left: 17px; color: var(--steel); font: 14px Consolas, monospace; }
.support-box { padding: 24px; color: var(--white); background: var(--navy); }
.support-box p { color: #d7e2e9; }

@media (max-width: 900px) {
  .main-nav { display: none; position: absolute; top: 70px; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; padding: 8px 20px 18px; background: var(--white); border-bottom: 2px solid var(--navy); }
  .main-nav.open { display: flex; }
  .main-nav a { min-height: 48px; }
  .menu-toggle { display: block; }
  .hero-grid, .page-hero-grid, .scenario-layout, .compatibility { grid-template-columns: 1fr; }
  .hero-media { max-width: 650px; }
  .section-head { grid-template-columns: 120px 1fr; }
  .feature-ledger { grid-template-columns: repeat(2,1fr); }
  .download-grid { grid-template-columns: repeat(2,1fr); }
  .download-item { border-bottom: 1px solid var(--line-dark); }
  .download-item:nth-child(2) { border-right: 0; }
  .scenario-tabs { display: grid; grid-template-columns: repeat(3,1fr); border-right: 0; border-bottom: 1px solid var(--line-dark); }
  .scenario-tab { border-right: 1px solid var(--line); border-bottom: 0; }
  .review-item { grid-template-columns: 160px 1fr; }
  .identity { grid-column: 2; justify-self: start; }
  .footer-grid { grid-template-columns: repeat(3,1fr); }
  .footer-brand { grid-column: 1 / -1; }
  .page-hero-media { max-width: 520px; border-left: 0; }
  .download-row { grid-template-columns: 150px 1fr; }
  .download-action { grid-column: 2; border-left: 0; padding-top: 0; }
  .help-shell { grid-template-columns: 1fr; }
  .help-sidebar { position: static; display: grid; grid-template-columns: repeat(3,1fr); }
  .help-sidebar h2 { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  .wrap { width: min(calc(100% - 28px), var(--max)); }
  .directory-inner { margin-left: 0; }
  .hero, .page-hero { padding: 42px 0; }
  .hero-grid { gap: 34px; }
  h1 { font-size: 38px; }
  .section { padding: 58px 0; }
  .section-head { grid-template-columns: 1fr; gap: 7px; }
  .flow-line { grid-template-columns: 1fr 1fr; gap: 16px 0; }
  .feature-ledger { grid-template-columns: 1fr; }
  .download-grid { grid-template-columns: 1fr; }
  .download-item, .download-item:nth-child(2) { border-right: 0; border-bottom: 1px solid var(--line-dark); }
  .download-item:last-child { border-bottom: 0; }
  .scenario-tabs { grid-template-columns: 1fr; }
  .scenario-tab { min-height: 62px; border-right: 0; border-bottom: 1px solid var(--line); }
  .scenario-panel.active { grid-template-columns: 1fr; }
  .review-item { grid-template-columns: 1fr; }
  .identity { grid-column: 1; }
  .pricing-grid { grid-template-columns: 1fr; }
  .plan, .plan:last-child { border-right: 0; border-bottom: 1px solid var(--line-dark); }
  .plan.featured { margin: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; }
  .download-row { grid-template-columns: 1fr; }
  .download-os, .download-action { grid-column: 1; }
  .download-action { padding-top: 0; }
  .guide-grid { grid-template-columns: 1fr; }
  .guide-step { border-right: 0; border-bottom: 1px solid var(--line-dark); }
  .help-sidebar { grid-template-columns: 1fr 1fr; }
}

/* Hero media final mandatory override */
.hero .hero-grid { align-items: center !important; }
.hero .hero-media {
  align-self: center !important;
  height: auto !important;
  min-height: 0 !important;
  max-height: none !important;
  padding: 0 !important;
  margin-top: 0 !important;
  margin-bottom: 0 !important;
  overflow: visible !important;
  clip-path: none !important;
  transform: none !important;
}
.hero .hero-media img {
  display: block !important;
  width: 100% !important;
  height: auto !important;
  min-height: 0 !important;
  max-height: none !important;
  margin: 0 !important;
  padding: 0 !important;
  object-fit: contain !important;
  object-position: center !important;
  clip-path: none !important;
  transform: none !important;
}