:root {
  --ink: #12233f;
  --ink-soft: #304662;
  --muted: #71819a;
  --line: #dce4ef;
  --line-strong: #cad6e6;
  --paper: #ffffff;
  --canvas: #f4f7fb;
  --blue: #1d55c7;
  --blue-dark: #123d96;
  --blue-soft: #edf3ff;
  --orange: #ff7050;
  --orange-soft: #fff2ed;
  --shadow: 0 14px 36px rgba(23, 48, 85, .07);
  --radius: 16px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
a:focus-visible, button:focus-visible, input:focus-visible, summary:focus-visible { outline: 3px solid rgba(29, 85, 199, .3); outline-offset: 3px; }
button, input { font: inherit; }
.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; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, .94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}
.header-inner, .hero-inner, .content-wrap, .footer-inner { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
.header-inner { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; white-space: nowrap; }
.brand-mark { display: grid; place-items: center; width: 42px; height: 42px; color: #fff; background: var(--ink); border-radius: 12px; box-shadow: inset 0 -10px 18px rgba(0,0,0,.13); }
.brand-mark svg { width: 29px; height: 29px; }
.brand strong { display: block; font-size: 20px; line-height: 1.1; letter-spacing: -.04em; }
.brand small { display: block; color: #8090a7; font-size: 10px; font-weight: 800; letter-spacing: .14em; line-height: 1; margin-top: 6px; }
.site-search { display: flex; width: min(380px, 42vw); height: 44px; border: 1px solid var(--line-strong); border-radius: 13px; overflow: hidden; background: #fff; }
.site-search input { min-width: 0; flex: 1; padding: 0 16px; border: 0; outline: 0; color: var(--ink); background: transparent; }
.site-search input::placeholder { color: #9aa6b8; }
.site-search button { width: 76px; border: 0; color: #fff; background: var(--blue); font-weight: 700; cursor: pointer; }
.site-search button:hover { background: var(--blue-dark); }

.hero { border-bottom: 1px solid var(--line); background: linear-gradient(180deg, #fff 0%, #fbfcff 68%, #f5f8fd 100%); }
.hero-inner { padding: 42px 0 34px; }
.breadcrumbs { display: flex; align-items: center; gap: 9px; color: #8593a7; font-size: 13px; margin-bottom: 28px; }
.breadcrumbs a { color: var(--blue); text-decoration: none; }
.breadcrumbs a:hover { text-decoration: underline; }
.tag-row { display: flex; flex-wrap: wrap; gap: 9px; margin-bottom: 18px; }
.tag { display: inline-flex; align-items: center; min-height: 33px; padding: 0 15px; border-radius: 999px; color: #24457e; background: var(--blue-soft); font-size: 13px; font-weight: 700; }
.tag-accent { color: #fff; background: var(--blue); }
.hero-title-row { display: flex; align-items: baseline; flex-wrap: wrap; gap: 20px; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 8px; font-size: clamp(38px, 5vw, 56px); letter-spacing: -.06em; line-height: 1.18; }
.alias { margin: 0 0 8px; color: #8795a9; font-size: 21px; font-weight: 700; }
.hero-summary { max-width: 920px; margin: 0; color: #52657f; font-size: 18px; line-height: 1.95; }
sup { margin-left: 2px; line-height: 0; }
sup a { color: var(--blue); font-size: .78em; font-weight: 800; text-decoration: none; }
sup a:hover { text-decoration: underline; }
.stat-row { display: grid; grid-template-columns: 1.35fr 1.15fr .9fr 1fr; gap: 24px; margin-top: 30px; padding-top: 22px; border-top: 1px solid var(--line); }
.stat-item span, .fact-list dt { display: block; color: #8694a8; font-size: 13px; }
.stat-item strong { display: block; margin-top: 3px; font-size: 17px; line-height: 1.4; }
.freshness-note { margin: 18px 0 0; color: #8a98ab; font-size: 12px; }

.content-wrap { padding: 54px 0 80px; }
.content-grid { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 34px; align-items: start; }
.main-column { min-width: 0; }
.answer-card { padding: 27px 32px 25px; border-left: 3px solid var(--orange); border-radius: 0 var(--radius) var(--radius) 0; background: linear-gradient(110deg, #edf3ff, #f4f7fc); box-shadow: var(--shadow); }
.answer-label { display: flex; align-items: center; gap: 11px; margin-bottom: 13px; }
.answer-label span { width: 31px; height: 2px; background: var(--orange); }
.answer-label h2 { margin: 0; color: var(--blue); font-size: 16px; }
.answer-card p { margin: 0; color: var(--ink-soft); font-size: 17px; line-height: 1.9; }
.answer-card strong { color: var(--ink); }
.toc-card, .faq-section, .sources-section { margin-top: 28px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper); box-shadow: var(--shadow); }
.toc-card { overflow: hidden; }
.section-heading { margin-bottom: 25px; }
.compact-heading { display: flex; align-items: center; justify-content: space-between; padding: 24px 26px 19px; margin: 0; border-bottom: 1px solid var(--line); }
.eyebrow { display: block; color: var(--blue); font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.section-heading h2, .compact-heading h2 { margin: 4px 0 0; font-size: 27px; line-height: 1.3; letter-spacing: -.045em; }
.count-badge, .live-dot { display: inline-flex; align-items: center; min-height: 29px; padding: 0 12px; border: 1px solid #d7e3fa; border-radius: 999px; color: var(--blue); background: var(--blue-soft); font-size: 12px; font-weight: 800; }
.toc-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); padding: 12px 26px 20px; }
.toc-grid a { display: flex; align-items: center; gap: 11px; min-width: 0; padding: 10px 0; color: var(--ink-soft); font-size: 14px; font-weight: 700; text-decoration: none; }
.toc-grid a:hover { color: var(--blue); }
.toc-grid a span { color: #9aabc0; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; }

.article-content { margin-top: 30px; padding: 34px 35px 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper); box-shadow: var(--shadow); }
.article-section { padding: 3px 0 36px; margin-bottom: 34px; border-bottom: 1px solid var(--line); scroll-margin-top: 96px; }
.article-section:last-child { margin-bottom: 0; border-bottom: 0; }
.article-section p, .faq-section p, .sources-section p, .editor-note p { color: var(--ink-soft); font-size: 16px; line-height: 1.95; }
.article-section p + p { margin-top: 15px; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; }
table { width: 100%; min-width: 560px; border-collapse: collapse; text-align: left; }
caption { padding: 13px 16px; color: #8090a4; background: #f7f9fc; border-bottom: 1px solid var(--line); font-size: 12px; text-align: left; }
th, td { padding: 13px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
tr:last-child th, tr:last-child td { border-bottom: 0; }
th { width: 24%; color: #5f718b; background: #fbfcfe; font-size: 14px; font-weight: 700; }
td { color: var(--ink); font-size: 14px; }
.experience-grid, .service-grid, .pros-cons { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin: 22px 0; }
.experience-card, .service-grid > div { padding: 20px; border: 1px solid var(--line); border-radius: 13px; background: #f8faff; }
.experience-index { display: inline-grid; place-items: center; width: 28px; height: 28px; margin-bottom: 12px; border-radius: 9px; color: #fff; background: var(--ink); font-size: 12px; font-weight: 800; }
.experience-card h3, .service-grid h3 { margin-bottom: 7px; font-size: 16px; }
.experience-card p, .service-grid p { margin: 0; font-size: 14px; line-height: 1.8; }
.muted-paragraph { color: #7c8ca2 !important; font-size: 14px !important; }
.price-panel { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin: 22px 0; overflow: hidden; border: 1px solid #d7e3fa; border-radius: 13px; background: #d7e3fa; }
.price-panel > div { padding: 17px 18px; background: #f2f6ff; }
.price-panel span { display: block; color: #71839e; font-size: 12px; }
.price-panel strong { display: block; margin-top: 5px; color: var(--blue-dark); font-size: 23px; line-height: 1.3; }
.price-panel small { font-size: 13px; font-weight: 600; }
.advice-list { margin-top: 20px; border-top: 1px solid var(--line); }
.advice-list div { display: grid; grid-template-columns: 86px 1fr; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.advice-list b { color: var(--blue); font-size: 14px; }
.advice-list span { color: var(--ink-soft); font-size: 14px; }
.service-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.pros-cons { grid-template-columns: 1fr 1fr; }
.pros-cons > div { display: flex; gap: 12px; padding: 17px; border-radius: 12px; }
.pros-cons .pro { background: #f0f7f3; }
.pros-cons .con { background: var(--orange-soft); }
.pros-cons > div > span { display: grid; place-items: center; flex: 0 0 auto; width: 24px; height: 24px; border-radius: 50%; color: #fff; background: #40966a; font-weight: 800; }
.pros-cons .con > span { background: var(--orange); }
.pros-cons b { font-size: 14px; }
.pros-cons p { margin: 3px 0 0; font-size: 13px; line-height: 1.7; }
.risk-section { padding: 23px; border: 1px solid #ffe0d6; border-radius: 13px; background: #fffaf8; }
.risk-list { margin: 17px 0 0; padding-left: 22px; color: var(--ink-soft); }
.risk-list li { padding: 8px 0; border-bottom: 1px dashed #f3d4cb; font-size: 14px; }
.risk-list li:last-child { border-bottom: 0; }
.risk-list b { color: var(--ink); }

.faq-section, .sources-section { padding: 32px 35px 24px; scroll-margin-top: 96px; }
.faq-list { border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); }
summary { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 18px 0; color: var(--ink); font-weight: 750; cursor: pointer; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--blue); font-size: 22px; font-weight: 400; }
details[open] summary::after { content: "–"; }
details p { margin: -3px 28px 17px 0; font-size: 14px; }
.sources-section { margin-top: 28px; }
.section-intro { margin-bottom: 18px; font-size: 14px !important; }
.source-list { display: grid; gap: 10px; margin: 0; padding-left: 23px; }
.source-list li { padding: 10px 0 10px 4px; border-bottom: 1px solid var(--line); color: var(--blue); }
.source-list li:last-child { border-bottom: 0; }
.source-list a { color: var(--blue); font-size: 14px; font-weight: 700; }
.source-list span { display: block; color: #8492a5; font-size: 12px; }
.editor-note { display: flex; align-items: center; gap: 14px; margin-top: 22px; padding: 18px 20px; border: 1px solid #dbe6f8; border-radius: 13px; background: var(--blue-soft); }
.note-icon { display: grid; place-items: center; flex: 0 0 auto; width: 25px; height: 25px; border: 1px solid #aac3f2; border-radius: 50%; color: var(--blue); font-family: Georgia, serif; font-weight: 700; }
.editor-note p { flex: 1; margin: 0; font-size: 13px; line-height: 1.75; }
.copy-link { flex: 0 0 auto; padding: 8px 12px; border: 1px solid #c7d7f5; border-radius: 8px; color: var(--blue); background: #fff; font-size: 12px; cursor: pointer; }
.copy-link:hover { background: #f8fbff; }

.side-column { min-width: 0; }
.side-card { padding: 22px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow); }
.sticky-card { position: sticky; top: 102px; }
.side-card-title { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.live-dot { min-height: 24px; color: #55729a; border-color: var(--line); background: #f6f8fb; font-weight: 600; }
.fact-list { margin: 0; }
.fact-list > div { padding: 12px 0; border-bottom: 1px solid var(--line); }
.fact-list > div:last-child { border-bottom: 0; }
.fact-list dt { margin-bottom: 2px; }
.fact-list dd { margin: 0; color: var(--ink); font-size: 14px; font-weight: 750; line-height: 1.55; }
.side-warning { margin-top: 16px; padding: 13px 14px; border-radius: 10px; color: #8d4c39; background: var(--orange-soft); }
.side-warning b { font-size: 12px; }
.side-warning p { margin: 2px 0 0; color: #9b6656; font-size: 12px; line-height: 1.6; }
.related-card { margin-top: 18px; }
.related-card a { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 12px 0; border-bottom: 1px solid var(--line); color: var(--ink-soft); font-size: 13px; font-weight: 700; text-decoration: none; }
.related-card a:last-child { border-bottom: 0; }
.related-card a:hover { color: var(--blue); }
.related-card a span { color: var(--blue); font-size: 17px; }

.site-footer { color: #a3b0c1; background: var(--ink); }
.footer-inner { display: flex; justify-content: space-between; gap: 32px; padding: 34px 0 40px; }
.footer-inner strong { color: #fff; font-size: 15px; }
.footer-inner p { max-width: 520px; margin: 6px 0 0; font-size: 12px; line-height: 1.7; }
.footer-meta { display: flex; flex-direction: column; align-items: flex-end; gap: 4px; font-size: 12px; }
.toast { position: fixed; right: 24px; bottom: 24px; z-index: 20; padding: 10px 15px; border-radius: 9px; color: #fff; background: var(--ink); box-shadow: var(--shadow); font-size: 13px; opacity: 0; transform: translateY(10px); pointer-events: none; transition: .2s ease; }
.toast.show { opacity: 1; transform: translateY(0); }
.search-hit { animation: hit .9s ease; }
@keyframes hit { 0%, 100% { box-shadow: none; } 35% { box-shadow: 0 0 0 5px rgba(255,112,80,.28); } }

@media (max-width: 900px) {
  .content-grid { grid-template-columns: 1fr; }
  .side-column { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
  .sticky-card { position: static; }
  .related-card { margin-top: 0; }
}
@media (max-width: 680px) {
  .header-inner, .hero-inner, .content-wrap, .footer-inner { width: min(100% - 28px, 560px); }
  .header-inner { min-height: auto; padding: 12px 0; flex-wrap: wrap; gap: 12px; }
  .brand strong { font-size: 17px; }
  .site-search { order: 3; width: 100%; }
  .hero-inner { padding: 28px 0 26px; }
  .breadcrumbs { margin-bottom: 20px; }
  h1 { font-size: 37px; }
  .alias { width: 100%; font-size: 16px; }
  .hero-summary { font-size: 16px; line-height: 1.85; }
  .stat-row { grid-template-columns: 1fr 1fr; gap: 18px 12px; }
  .stat-item strong { font-size: 15px; }
  .content-wrap { padding: 28px 0 48px; }
  .answer-card, .article-content, .faq-section, .sources-section { padding-left: 20px; padding-right: 20px; }
  .answer-card { padding-top: 20px; padding-bottom: 20px; }
  .toc-grid { grid-template-columns: 1fr; padding-left: 20px; padding-right: 20px; }
  .compact-heading { padding-left: 20px; padding-right: 20px; }
  .section-heading h2, .compact-heading h2 { font-size: 24px; }
  .experience-grid, .service-grid, .pros-cons, .price-panel { grid-template-columns: 1fr; }
  .price-panel { gap: 1px; }
  .price-panel > div { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
  .price-panel strong { margin-top: 0; }
  .advice-list div { grid-template-columns: 70px 1fr; gap: 10px; }
  .side-column { display: block; }
  .related-card { margin-top: 18px; }
  .editor-note { align-items: flex-start; flex-wrap: wrap; }
  .editor-note p { flex-basis: calc(100% - 45px); }
  .copy-link { margin-left: 39px; }
  .footer-inner { flex-direction: column; }
  .footer-meta { align-items: flex-start; }
}