:root {
  --ink: #152333;
  --muted: #526273;
  --blue: #155bc5;
  --blue-dark: #10499d;
  --line: #dce4ec;
  --soft: #f3f6fa;
  --radius: 20px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 100px; }
body { margin: 0; color: var(--ink); background: #fff; font: 16px/1.75 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; }
a { color: var(--blue); text-underline-offset: 4px; }
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2, h3 { line-height: 1.3; letter-spacing: -.025em; }
h1 { font-size: clamp(34px, 4.5vw, 58px); font-weight: 730; }
h2 { font-size: clamp(25px, 3vw, 34px); }
h3 { font-size: 23px; }
.shell { width: min(1120px, calc(100% - 64px)); margin-inline: auto; }
.site-header { border-bottom: 1px solid var(--line); background: #fff; }
.header-inner { min-height: 98px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--ink); font-size: 21px; font-weight: 720; line-height: 1.3; flex-shrink: 0; }
.brand img { border-radius: 10px; }
.brand small { display: block; color: var(--muted); font-size: 12px; font-weight: 450; letter-spacing: .015em; margin-top: 3px; }
.header-inner nav, .footer-inner nav { display: flex; gap: 25px; align-items: center; flex-wrap: wrap; }
.header-inner nav a { font-size: 14px; color: #344459; text-decoration: none; }
.header-inner nav a:hover, .header-inner nav a[aria-current] { color: var(--blue); }
.header-inner .language { border-left: 1px solid var(--line); padding-left: 25px; }
.skip-link { position: absolute; left: 12px; top: -100px; background: var(--ink); color: #fff; padding: 10px 18px; z-index: 10; }
.skip-link:focus { top: 12px; }
a:focus-visible, summary:focus-visible { outline: 3px solid #e8ad42; outline-offset: 5px; }
.hero { display: grid; grid-template-columns: 1.25fr .8fr; gap: 64px; align-items: center; padding: 72px 0 80px; }
.eyebrow { display: block; color: var(--blue); font-size: 12px; font-weight: 700; letter-spacing: .07em; margin-bottom: 18px; }
.hero h1 { margin-bottom: 26px; }
.hero-benefits { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 20px 0 0; list-style: none; }
.hero-benefits a { display: block; padding: 5px 12px; border: 1px solid #cadcf2; border-radius: 999px; color: var(--blue-dark); background: #f5f9ff; font-size: 13px; font-weight: 650; text-decoration: none; }
.hero-benefits a:hover { border-color: var(--blue); }
.speed-example { margin-top: 22px; padding: 17px 20px; border-left: 3px solid var(--blue); border-radius: 0 14px 14px 0; background: #edf4ff; }
.speed-label { font-size: 11px; color: var(--blue-dark); font-weight: 700; letter-spacing: .04em; }
.speed-result { display: flex; align-items: baseline; flex-wrap: wrap; gap: 8px 14px; margin: 5px 0; font-size: clamp(24px, 2.5vw, 32px); line-height: 1.4; letter-spacing: -.02em; }
.speed-result > span { color: var(--blue); font-size: 22px; }
.speed-caption { font-size: 13px; color: #344e70; }
.speed-note { font-size: 12px; color: var(--muted); margin-top: 6px; line-height: 1.6; }
.intro { color: var(--muted); font-size: 18px; line-height: 1.9; max-width: 760px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 30px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 11px 22px; border-radius: 10px; font-size: 14px; font-weight: 650; text-decoration: none; text-align: center; }
.button-primary { background: var(--blue); color: #fff; }
.button-primary:hover { background: var(--blue-dark); }
.button-secondary { color: var(--ink); border: 1px solid #becbd9; background: #fff; }
.small-note { font-size: 12px; color: var(--muted); margin-top: 17px; }
.hero-visual { background: var(--soft); border: 1px solid var(--line); border-radius: 30px; padding: 32px 36px 26px; display: flex; flex-direction: column; align-items: center; }
.screen-frame { border-radius: 25px; overflow: hidden; box-shadow: 0 16px 36px #15233316; width: 176px; background: #050505; }
.hero-visual figcaption { text-align: center; margin-top: 22px; font-size: 14px; }
.hero-visual figcaption strong { display: block; font-weight: 600; }
.hero-visual figcaption span { display: block; font-size: 12px; color: var(--muted); margin-top: 4px; }
.section { padding: 52px 0; border-top: 1px solid var(--line); }
.section-heading { max-width: 760px; margin-bottom: 28px; }
.section-heading .eyebrow { margin-bottom: 12px; }
.section-heading p { color: var(--muted); margin-top: 12px; }
.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.feature-card { display: flex; flex-direction: column; padding: 28px 25px; border: 1px solid var(--line); border-radius: var(--radius); color: var(--ink); text-decoration: none; transition: border-color .16s; }
.feature-card:hover { border-color: var(--blue); }
.feature-card .eyebrow { font-size: 11px; margin-bottom: 20px; }
.feature-card h3 { font-size: 22px; }
.feature-card p { color: var(--muted); font-size: 14px; margin: 14px 0 22px; }
.text-link { color: var(--blue); font-size: 14px; font-weight: 650; margin-top: auto; }
.facts { margin: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; border: 1px solid var(--line); background: var(--line); border-radius: var(--radius); overflow: hidden; }
.facts > div { background: var(--soft); padding: 24px 28px; }
.facts dt { font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.facts dd { margin: 0; font-size: 15px; }
.inline-links { display: flex; gap: 16px 28px; flex-wrap: wrap; margin-top: 24px; font-size: 14px; }
.questions { border-top: 1px solid var(--line); }
.questions details { border-bottom: 1px solid var(--line); padding: 18px 2px; }
.questions summary { cursor: pointer; font-weight: 600; padding-right: 20px; }
.questions details > div { padding: 15px 24px 4px 0; color: var(--muted); }
.questions details > div p { margin-bottom: 10px; }
.download-strip { background: var(--soft); border-radius: var(--radius); display: flex; align-items: center; justify-content: space-between; gap: 28px; padding: 32px; margin: 36px 0 26px; }
.download-strip h2 { font-size: 25px; }
.download-strip p { font-size: 14px; color: var(--muted); margin-top: 9px; }
.download-strip .button { flex-shrink: 0; }
.source-note { color: var(--muted); font-size: 12px; padding: 0 0 36px; }
.source-note > span { display: block; margin-bottom: 5px; }
.source-note a { color: var(--muted); }
.site-footer { border-top: 1px solid var(--line); }
.footer-inner { display: flex; justify-content: space-between; gap: 24px; align-items: center; padding: 28px 0; color: var(--muted); font-size: 12px; }
.footer-inner nav { gap: 18px; }
.footer-inner a { color: var(--muted); text-decoration: none; }
.breadcrumbs { display: flex; gap: 11px; font-size: 12px; color: var(--muted); margin-bottom: 30px; align-items: baseline; }
.breadcrumbs span:last-child { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.breadcrumbs a { flex-shrink: 0; }
.article-heading { padding: 38px 0 44px; max-width: 920px; }
.article-heading h1 { font-size: clamp(31px, 4vw, 46px); margin: 0 0 20px; }
.article-heading > .eyebrow { margin-bottom: 14px; }
.article-grid { display: grid; grid-template-columns: minmax(0, 760px) 240px; gap: 72px; padding-bottom: 50px; }
.article-body { min-width: 0; }
.article-body section { border-top: 1px solid var(--line); padding: 30px 0; }
.article-body h2 { font-size: 25px; margin-bottom: 18px; }
.article-body h3 { font-size: 19px; margin: 22px 0 12px; }
.article-body p, .article-body li { color: #3b4c5d; }
.article-body p + p { margin-top: 15px; }
.article-body ol, .article-body ul { padding-left: 24px; margin: 0; }
.article-body li { padding-left: 5px; margin-bottom: 12px; }
.article-body .cards { grid-template-columns: 1fr; }
.article-body .feature-card { margin-bottom: 16px; }
.sidebar { align-self: start; position: sticky; top: 24px; padding-top: 30px; }
.sidebar > a { display: block; color: var(--muted); font-size: 13px; margin: 14px 0; text-decoration: none; }
.sidebar .eyebrow { margin-bottom: 15px; }
.sidebar-links { display: grid; gap: 12px; border-top: 1px solid var(--line); margin-top: 25px; padding-top: 22px; font-size: 13px; }
.related h2 { font-size: 24px; }
.screen-gallery { display: flex; gap: 28px; align-items: start; flex-wrap: wrap; background: var(--soft); padding: 26px; border-radius: 16px; }
.screen-gallery img { width: min(180px, calc(50% - 14px)); border-radius: 22px; }
.article-body .caption { font-size: 12px; color: var(--muted); margin-top: 14px; }
code { background: var(--soft); border: 1px solid var(--line); border-radius: 4px; padding: 1px 5px; font-size: .88em; overflow-wrap: anywhere; }
pre { background: var(--soft); border: 1px solid var(--line); border-radius: 12px; padding: 20px; white-space: pre-wrap; overflow-wrap: anywhere; font-size: 13px; line-height: 1.7; }
pre code { background: none; border: 0; padding: 0; font-size: inherit; }
.srt-tool { padding: 24px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--soft); }
.srt-tool label { display: block; font-weight: 650; margin-bottom: 8px; }
.srt-tool input, .srt-tool textarea { max-width: 100%; width: 100%; font: inherit; margin: 0 0 18px; }
.srt-tool textarea { min-height: 260px; resize: vertical; padding: 14px; border: 1px solid #a9b8c8; border-radius: 10px; background: #fff; color: var(--ink); font: 13px/1.7 ui-monospace, SFMono-Regular, Consolas, monospace; }
.tool-actions { display: flex; gap: 10px; flex-wrap: wrap; margin: 6px 0 14px; }
.tool-actions button { cursor: pointer; border: 1px solid #becbd9; font-family: inherit; }
.tool-actions .button-primary { border-color: var(--blue); }
.srt-tool :focus-visible { outline: 3px solid #e8ad42; outline-offset: 3px; }
.srt-tool p { font-size: 13px; }
.srt-result { padding: 20px; margin-top: 20px; border: 1px solid #b7c9df; border-radius: 12px; background: #fff; overflow-wrap: anywhere; }
.srt-result[data-state=error] { border-color: #b75338; }
.srt-result[data-state=success] { border-color: #38805c; }
.srt-result strong { display: block; margin-bottom: 12px; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; text-align: left; }
th, td { border-bottom: 1px solid var(--line); padding: 14px 12px; vertical-align: top; }
th { background: var(--soft); font-weight: 650; }
.legal-content .section, .legal-content .highlight-box, .legal-content .contact-info { padding: 26px 0; border-top: 1px solid var(--line); }
.legal-content h4 { font-size: 20px; margin: 0 0 12px; }
.legal-content .last-updated { font-size: 12px; color: var(--muted); margin-bottom: 24px; }
@media (max-width: 900px) {
  .hero { gap: 35px; grid-template-columns: 1.2fr .8fr; }
  .cards { gap: 12px; }
  .feature-card { padding: 24px 19px; }
  .article-grid { grid-template-columns: minmax(0, 1fr) 190px; gap: 36px; }
  .header-inner nav { gap: 16px; }
  .header-inner .language { padding-left: 16px; }
}
@media (max-width: 680px) {
  .shell { width: calc(100% - 36px); }
  .header-inner { min-height: 110px; gap: 14px; align-content: center; flex-wrap: wrap; padding: 15px 0; }
  .brand { font-size: 19px; }
  .brand img { width: 35px; height: 35px; }
  .header-inner nav { width: 100%; gap: 18px; justify-content: space-between; }
  .header-inner nav a { font-size: 12px; }
  .header-inner .language { padding-left: 14px; }
  .hero { grid-template-columns: 1fr; padding: 42px 0; gap: 32px; }
  .hero h1 { margin-bottom: 21px; }
  .intro { font-size: 16px; }
  .hero-visual { flex-direction: row; justify-content: center; gap: 25px; padding: 24px; }
  .screen-frame { width: 118px; border-radius: 17px; flex-shrink: 0; }
  .hero-visual figcaption { text-align: left; margin: 0; }
  .hero-visual figcaption strong { max-width: 145px; }
  .section { padding: 34px 0; }
  .cards, .facts { grid-template-columns: 1fr; }
  .feature-card { padding: 24px; }
  .feature-card p { margin-bottom: 18px; }
  .section-heading { margin-bottom: 22px; }
  .download-strip { display: block; padding: 25px; }
  .download-strip .button { margin-top: 21px; width: 100%; }
  .footer-inner { display: block; padding: 22px 0; }
  .footer-inner nav { margin-top: 13px; }
  .article-heading { padding: 25px 0 30px; }
  .breadcrumbs { margin-bottom: 25px; }
  .article-grid { display: block; padding-bottom: 15px; }
  .sidebar { position: static; border-top: 1px solid var(--line); padding: 20px 0; }
  .sidebar > a, .sidebar .eyebrow { display: none; }
  .sidebar-links { border: 0; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 20px; }
  .article-body h2 { font-size: 23px; }
  .article-body section { padding: 25px 0; }
  .table-wrap { margin-inline: -6px; }
  th, td { padding: 12px 8px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}