:root {
  color-scheme: light;
  --ink: #172233;
  --muted: #68768a;
  --blue: #2368f4;
  --blue-deep: #1550ce;
  --line: #dfe8f1;
  --paper: #f7fbff;
  --pale-blue: #edf5ff;
  --white: #fff;
  font-family: "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { min-width: 320px; margin: 0; color: var(--ink); background: var(--paper); }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { cursor: pointer; }
svg { width: 1.2em; height: 1.2em; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
svg path, svg circle { vector-effect: non-scaling-stroke; }
.shell { width: min(1120px, calc(100% - 48px)); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: absolute; z-index: 100; top: -80px; left: 16px; padding: 10px 14px; border-radius: 8px; color: #fff; background: var(--blue-deep); }
.skip-link:focus { top: 12px; }
:focus-visible { outline: 3px solid #88b4ff; outline-offset: 3px; }

.site-header { position: relative; z-index: 10; height: 76px; border-bottom: 1px solid #e4edf5; background: rgba(255, 255, 255, .96); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; height: 100%; }
.brand { display: inline-flex; align-items: center; gap: 11px; flex: none; font-size: 20px; font-weight: 780; letter-spacing: -.04em; white-space: nowrap; }
.brand-accent { color: var(--blue); }
.brand-mark { display: block; width: 36px; height: 36px; flex: none; border-radius: 11px; object-fit: cover; box-shadow: 0 5px 13px rgba(35, 104, 244, .18); }
.header-nav { display: flex; align-items: center; gap: 32px; color: #64758a; font-size: 14px; font-weight: 650; }
.header-nav a:hover, .header-nav a:focus-visible { color: var(--blue-deep); }
.header-nav [aria-current] { color: var(--blue-deep); }

.hero { position: relative; overflow: hidden; border-bottom: 1px solid #dceaf7; background: linear-gradient(121deg, #f8fcff 10%, #eaf4ff 70%, #f7fcff 100%); }
.hero::before { position: absolute; inset: 0; content: ""; opacity: .52; pointer-events: none; background-image: linear-gradient(rgba(76, 137, 190, .075) 1px, transparent 1px), linear-gradient(90deg, rgba(76, 137, 190, .075) 1px, transparent 1px); background-size: 64px 64px; mask-image: linear-gradient(to bottom, #000, transparent 100%); }
.hero::after { position: absolute; top: -185px; right: -100px; width: 520px; height: 520px; content: ""; pointer-events: none; border: 1px solid rgba(35, 104, 244, .13); border-radius: 50%; box-shadow: 0 0 0 65px rgba(35, 104, 244, .035), 0 0 0 125px rgba(35, 104, 244, .02); }
.hero-inner { position: relative; z-index: 1; padding-top: 69px; padding-bottom: 66px; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; margin: 0 0 22px; color: #2766ad; font-size: 12px; font-weight: 760; letter-spacing: .08em; }
.eyebrow span { width: 4px; height: 4px; border-radius: 50%; background: #61a4e9; }
.hero h1 { margin: 0; color: #183d6e; font-size: clamp(38px, 5.1vw, 59px); line-height: 1.18; font-weight: 800; letter-spacing: -.055em; }
.hero-description { max-width: 700px; margin: 18px 0 30px; color: #64778b; font-size: 16px; line-height: 1.75; }
.search-wrap { position: relative; display: flex; align-items: center; width: min(720px, 100%); height: 62px; padding: 0 17px 0 20px; border: 1px solid #bfcfe0; border-radius: 15px; background: #fff; box-shadow: 0 13px 35px rgba(35, 82, 142, .11); transition: border-color .2s, box-shadow .2s; }
.search-wrap:focus-within { border-color: var(--blue); box-shadow: 0 0 0 4px rgba(35, 104, 244, .1), 0 13px 35px rgba(35, 82, 142, .11); }
.search-icon { flex: none; width: 22px; height: 22px; color: #748da6; }
.search-wrap input { width: 100%; min-width: 0; height: 100%; padding: 0 15px; border: 0; outline: 0; color: var(--ink); background: transparent; font-size: 15px; }
.search-wrap input::placeholder { color: #96a5b4; opacity: 1; }
.search-wrap input::-webkit-search-cancel-button { cursor: pointer; }
.search-shortcut { flex: none; display: grid; width: 26px; height: 26px; place-items: center; border: 1px solid #e3eaf2; border-radius: 6px; color: #8b9bad; background: #f9fbfd; font: 13px/1 system-ui, sans-serif; }
.search-hint { margin: 12px 0 0 2px; color: #7790a7; font-size: 12px; }

.content-layout { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 42px; align-items: start; padding-top: 59px; padding-bottom: 105px; }
.topic-panel { position: sticky; top: 26px; padding: 20px 14px 16px; border: 1px solid var(--line); border-radius: 16px; background: #fff; box-shadow: 0 8px 25px rgba(49, 86, 122, .04); }
.topic-panel h2 { margin: 0 10px 15px; color: #788a9e; font-size: 12px; font-weight: 750; letter-spacing: .08em; }
.topic-list { display: grid; gap: 3px; }
.topic-button { display: flex; align-items: center; justify-content: space-between; gap: 12px; width: 100%; min-height: 45px; padding: 0 12px; border: 0; border-radius: 9px; color: #62758a; background: transparent; text-align: left; font-size: 14px; font-weight: 650; transition: color .18s, background .18s; }
.topic-button:hover { color: var(--blue-deep); background: #f4f8ff; }
.topic-button.is-active { color: var(--blue-deep); background: var(--pale-blue); }
.topic-count { color: #9aacbf; font-size: 12px; font-weight: 700; }
.topic-button.is-active .topic-count { color: var(--blue-deep); }
.faq-content { min-width: 0; }
.content-heading { display: flex; justify-content: space-between; align-items: end; gap: 16px; margin-bottom: 39px; }
.section-label { margin: 0 0 9px; color: var(--blue); font-size: 12px; font-weight: 760; letter-spacing: .08em; }
.content-heading h2 { margin: 0; font-size: clamp(24px, 2.9vw, 33px); font-weight: 790; letter-spacing: -.035em; }
.result-status { flex: none; margin: 0 0 4px; color: #8494a5; font-size: 13px; }
.question-list { overflow: hidden; border: 1px solid var(--line); border-radius: 14px; background: #fff; box-shadow: 0 9px 28px rgba(49, 86, 122, .045); }
.question-item { display: flex; align-items: center; gap: 18px; min-height: 82px; padding: 17px 24px; transition: background .18s; }
.question-item:hover { background: #f8fbff; }
.question-item:focus-visible { position: relative; z-index: 1; }
.question-item + .question-item { border-top: 1px solid #e9eef4; }
.question-summary-copy { display: grid; flex: 1; min-width: 0; gap: 7px; }
.question-title-text { color: #25364b; font-size: 15px; font-weight: 700; line-height: 1.5; }
.question-item:hover .question-title-text { color: var(--blue-deep); }
.question-summary-description { color: #8292a4; font-size: 13px; line-height: 1.5; }
.question-item time { flex: none; color: #8a9bad; font-size: 13px; }
.question-item svg { flex: none; width: 18px; height: 18px; color: #91a4b8; transition: transform .2s, color .2s; }
.question-item:hover svg { color: var(--blue); transform: translateX(2px); }
.question-item[hidden], .empty-state[hidden] { display: none; }
.guide-back { display: inline-flex; align-items: center; gap: 7px; margin-bottom: 28px; color: #56718e; font-size: 14px; font-weight: 650; }
.guide-back:hover { color: var(--blue-deep); }
.guide-back svg { width: 17px; height: 17px; }
.guide-hero .hero-inner { padding-top: 48px; padding-bottom: 48px; }
.guide-hero .eyebrow { display: flex; margin-bottom: 16px; }
.guide-hero h1 { max-width: 900px; font-size: clamp(34px, 4.2vw, 50px); }
.guide-hero .hero-description { margin-bottom: 0; }
.guide-layout { padding-top: 36px; padding-bottom: 88px; }
.guide-content { padding: 30px 34px 38px; border: 1px solid var(--line); border-radius: 16px; color: #53677d; background: #fff; box-shadow: 0 9px 28px rgba(49, 86, 122, .045); font-size: 14px; line-height: 1.8; }
.guide-meta { margin: 0 0 16px; color: #8a9bad; font-size: 12px; }
.article-intro { margin: 0 0 18px; color: #53677d; }
.step-figure { width: fit-content; max-width: 100%; margin: 18px auto 0; }
.step-figure img { display: block; width: auto; max-width: 100%; height: auto; margin-inline: auto; border: 1px solid var(--line); border-radius: 10px; background: #f7f9fc; }
.step-figure figcaption { margin-top: 7px; color: #8a9bad; font-size: 12px; text-align: center; }
.error-figure { max-width: 100%; margin-bottom: 28px; }
.repair-steps { margin: 0; padding: 0; list-style: none; }
.repair-steps li + li { margin-top: 30px; padding-top: 26px; border-top: 1px solid #edf1f6; }
.repair-steps h2 { display: flex; align-items: center; gap: 11px; margin: 0 0 9px; color: #294d72; font-size: 16px; font-weight: 750; line-height: 1.5; }
.repair-steps h2 span { display: grid; flex: none; width: 27px; height: 27px; place-items: center; border-radius: 50%; color: var(--blue-deep); background: var(--pale-blue); font: 700 12px/1 system-ui, sans-serif; }
.repair-steps p { margin: 0; color: #64758a; }
.repair-steps code, .repair-steps kbd { padding: 2px 6px; border: 1px solid #e2eaf2; border-radius: 5px; color: #31506e; background: #f5f8fc; font-family: Consolas, "Microsoft YaHei UI", monospace; font-size: .92em; }
.empty-state { margin: 0; padding: 45px 20px; color: #8294a8; text-align: center; font-size: 14px; }

.site-footer { border-top: 1px solid #e2eaf3; background: #fff; }
.footer-inner { display: flex; align-items: center; gap: 22px; min-height: 98px; color: #8a9bad; font-size: 12px; }
.footer-inner > span { flex: none; color: #526a83; font-weight: 750; }
.footer-inner p { margin: 0 auto 0 0; }
.footer-inner a { display: inline-flex; align-items: center; gap: 4px; flex: none; color: #5577a6; font-weight: 680; }
.footer-inner a:hover { color: var(--blue-deep); }
.footer-inner svg { width: 15px; height: 15px; }

@media (max-width: 860px) {
  .content-layout { grid-template-columns: 190px minmax(0, 1fr); gap: 26px; }
  .header-nav { gap: 18px; }
}

@media (max-width: 680px) {
  .shell { width: min(100% - 32px, 1120px); }
  .site-header { height: 64px; }
  .brand { font-size: 18px; }
  .brand-mark { width: 32px; height: 32px; border-radius: 9px; }
  .header-nav { gap: 16px; font-size: 12px; }
  .header-nav [aria-current] { display: none; }
  .hero-inner { padding-top: 47px; padding-bottom: 49px; }
  .hero::after { right: -350px; }
  .hero-description { margin: 14px 0 25px; font-size: 14px; }
  .search-wrap { height: 56px; padding-left: 16px; border-radius: 12px; }
  .search-shortcut { display: none; }
  .content-layout { display: block; padding-top: 32px; padding-bottom: 70px; }
  .topic-panel { position: static; margin-bottom: 36px; padding: 0; border: 0; background: transparent; box-shadow: none; }
  .topic-panel h2 { margin: 0 0 11px; }
  .topic-list { display: flex; gap: 8px; overflow-x: auto; padding: 2px 2px 8px; scrollbar-width: thin; }
  .topic-button { justify-content: center; width: auto; min-height: 38px; padding: 0 13px; flex: none; border: 1px solid #dbe5ef; border-radius: 9px; background: #fff; white-space: nowrap; font-size: 13px; }
  .topic-button.is-active { border-color: #c9ddfb; }
  .topic-count { display: none; }
  .content-heading { margin-bottom: 29px; }
  .content-heading h2 { font-size: 25px; }
  .question-item { min-height: 67px; gap: 10px; padding: 15px 17px; }
  .question-title-text { font-size: 14px; }
  .question-summary-description { font-size: 12px; }
  .question-item time { display: none; }
  .guide-hero .hero-inner { padding-top: 36px; padding-bottom: 38px; }
  .guide-back { margin-bottom: 22px; font-size: 13px; }
  .guide-hero h1 { font-size: 34px; }
  .guide-layout { padding-top: 24px; padding-bottom: 60px; }
  .guide-content { padding: 22px 17px 26px; font-size: 13px; }
  .repair-steps h2 { font-size: 15px; }
  .empty-state { padding: 38px 16px; }
  .footer-inner { flex-wrap: wrap; align-content: center; gap: 6px 15px; padding-block: 22px; }
  .footer-inner p { flex-basis: 100%; order: 2; }
}

@media (max-width: 420px) {
  .header-nav { gap: 11px; }
  .header-nav a { font-size: 11px; }
  .hero h1 { font-size: 37px; }
  .result-status { font-size: 11px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}