:root {
  --brand: #ff6a00;
  --brand-dark: #d94800;
  --ink: #181818;
  --muted: #5e6570;
  --line: #dedede;
  --canvas: #fff;
  --surface: #f5f6f7;
  --surface-warm: #fff7f0;
  --success: #168a4b;
  --max: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
}
a { color: inherit; }
img { max-width: 100%; }
button, input, select, textarea { font: inherit; }
:focus-visible { outline: 3px solid rgba(255, 106, 0, .35); outline-offset: 3px; }
.skip-link { position: fixed; left: 12px; top: -80px; z-index: 100; padding: 10px 14px; background: #111; color: white; }
.skip-link:focus { top: 12px; }
.container { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; }
.utility { background: #171717; color: #d4d4d4; font-size: 13px; }
.utility .container { min-height: 34px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.utility a { color: white; text-decoration: none; }
.site-header { position: sticky; top: 0; z-index: 30; background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
.nav-wrap { min-height: 68px; display: flex; align-items: center; gap: 34px; }
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; white-space: nowrap; }
.brand-mark { width: 36px; height: 36px; display: grid; place-items: center; color: white; background: var(--brand); font-weight: 700; }
.brand-name { font-size: 19px; font-weight: 650; }
.nav { margin-left: auto; display: flex; align-items: center; gap: 5px; }
.nav a { min-height: 44px; display: inline-flex; align-items: center; padding: 0 13px; color: #3f444b; text-decoration: none; border-bottom: 2px solid transparent; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--brand-dark); border-color: var(--brand); }
.nav-login { margin-left: 10px; background: var(--brand); color: white !important; border: 0 !important; padding-inline: 19px !important; }
.nav-login:hover { background: var(--brand-dark); }
.menu-button { display: none; margin-left: auto; min-width: 44px; min-height: 44px; border: 1px solid var(--line); background: white; }
.hero { overflow: hidden; background: linear-gradient(115deg, #fff 0 55%, #fff5eb 55% 100%); border-bottom: 1px solid var(--line); }
.hero-grid { min-height: 570px; display: grid; grid-template-columns: 1.1fr .9fr; align-items: center; gap: 70px; }
.eyebrow { margin: 0 0 16px; color: var(--brand-dark); font-size: 14px; font-weight: 650; letter-spacing: .08em; }
h1, h2, h3 { margin-top: 0; line-height: 1.22; }
h1 { max-width: 760px; margin-bottom: 24px; font-size: clamp(42px, 5.4vw, 68px); font-weight: 360; letter-spacing: -.02em; }
h2 { margin-bottom: 18px; font-size: clamp(30px, 3.6vw, 44px); font-weight: 420; }
h3 { margin-bottom: 10px; font-size: 22px; }
.lead { max-width: 720px; margin: 0 0 32px; color: var(--muted); font-size: 19px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; padding: 10px 20px; border: 1px solid var(--ink); background: var(--ink); color: white; text-decoration: none; cursor: pointer; }
.button.primary { border-color: var(--brand); background: var(--brand); }
.button.primary:hover { background: var(--brand-dark); }
.button.secondary { background: white; color: var(--ink); }
.button.secondary:hover { border-color: var(--brand); color: var(--brand-dark); }
.hero-panel { position: relative; min-height: 380px; padding: 34px; color: white; background: #1f2329; }
.hero-panel::before { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at 80% 20%, rgba(255,106,0,.32), transparent 32%); pointer-events: none; }
.mail-window { position: relative; margin-top: 42px; background: white; color: var(--ink); border-top: 5px solid var(--brand); }
.mail-top { display: flex; gap: 7px; padding: 13px 16px; border-bottom: 1px solid var(--line); }
.mail-top span { width: 8px; height: 8px; background: #c8c8c8; border-radius: 50%; }
.mail-body { display: grid; grid-template-columns: 90px 1fr; min-height: 205px; }
.mail-side { background: #f0f1f2; border-right: 1px solid var(--line); }
.mail-content { padding: 25px; }
.mail-line { height: 9px; margin: 0 0 14px; background: #e4e5e7; }
.mail-line.orange { width: 54%; background: #ffb784; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); border-bottom: 1px solid var(--line); }
.stat { padding: 28px 24px; border-right: 1px solid var(--line); }
.stat:last-child { border-right: 0; }
.stat strong { display: block; font-size: 28px; font-weight: 500; }
.stat span { color: var(--muted); font-size: 14px; }
.section { padding: 88px 0; }
.section.gray { background: var(--surface); }
.section.dark { background: #171717; color: white; }
.section-head { max-width: 760px; margin-bottom: 40px; }
.section-head p { color: var(--muted); }
.dark .section-head p { color: #c7c7c7; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.card { min-height: 238px; padding: 30px; background: white; }
.card-number { display: inline-grid; place-items: center; width: 36px; height: 36px; margin-bottom: 30px; background: var(--surface-warm); color: var(--brand-dark); font-weight: 700; }
.card p { color: var(--muted); }
.feature-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 70px; }
.feature-item { padding: 26px 0; border-top: 1px solid var(--line); }
.feature-item p { margin: 0; color: var(--muted); }
.feature-item a { color: var(--brand-dark); text-decoration: none; }
.band { padding: 52px 0; background: var(--brand); color: white; }
.band .container { display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.band h2 { margin: 0; font-size: 34px; }
.band .button { background: white; border-color: white; color: var(--ink); }
.page-hero { padding: 76px 0 68px; background: var(--surface); border-bottom: 1px solid var(--line); }
.page-hero h1 { font-size: clamp(38px, 5vw, 56px); }
.breadcrumbs { margin-bottom: 22px; color: var(--muted); font-size: 14px; }
.breadcrumbs a { color: var(--brand-dark); text-decoration: none; }
.product-grid, .price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.product-card, .price-card { padding: 30px; border: 1px solid var(--line); background: white; }
.product-card ul, .price-card ul { padding-left: 20px; color: var(--muted); }
.price-card.featured { border-top: 5px solid var(--brand); }
.price { margin: 18px 0; font-size: 38px; font-weight: 500; }
.price small { color: var(--muted); font-size: 14px; font-weight: 400; }
.notice { padding: 18px 20px; border-left: 4px solid var(--brand); background: var(--surface-warm); }
.subnav { border-bottom: 1px solid var(--line); background: white; }
.subnav .container { display: flex; gap: 4px; overflow-x: auto; padding-block: 10px; }
.subnav a { flex: 0 0 auto; padding: 8px 13px; color: var(--muted); text-decoration: none; }
.subnav a:hover, .subnav a[aria-current="page"] { color: var(--brand-dark); background: var(--surface-warm); }
.product-card { display: flex; flex-direction: column; }
.product-card p { color: var(--muted); }
.product-card .button { align-self: flex-start; margin-top: auto; }
.detail-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 72px; align-items: start; }
.detail-main h2 { margin-top: 54px; font-size: 32px; }
.detail-main h2:first-child { margin-top: 0; }
.detail-main h3 { margin-top: 30px; font-size: 20px; }
.detail-main p, .detail-main li { color: var(--muted); }
.detail-main li + li { margin-top: 8px; }
.detail-aside { position: sticky; top: 102px; padding: 24px; border-top: 4px solid var(--brand); background: var(--surface); }
.detail-aside h2 { font-size: 20px; }
.detail-aside a { display: block; padding: 10px 0; border-bottom: 1px solid var(--line); color: var(--ink); text-decoration: none; }
.detail-aside a:hover { color: var(--brand-dark); }
.capability-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin: 30px 0; border: 1px solid var(--line); background: var(--line); }
.capability { padding: 24px; background: white; }
.capability h3 { margin: 0 0 8px; }
.capability p { margin: 0; }
.help-search { max-width: 760px; margin-top: 28px; }
.help-search input { width: 100%; min-height: 52px; padding: 12px 16px; border: 1px solid #b8bcc2; background: white; }
.help-search input:focus { border-color: var(--brand); }
.help-summary { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 26px; color: var(--muted); }
.help-groups { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.help-group { padding: 28px; border: 1px solid var(--line); background: white; }
.help-group h2 { margin-bottom: 18px; font-size: 24px; }
.help-links { margin: 0; padding: 0; list-style: none; }
.help-links li { border-top: 1px solid var(--line); }
.help-links a { display: flex; justify-content: space-between; gap: 16px; padding: 13px 0; text-decoration: none; }
.help-links a::after { content: "→"; color: var(--brand-dark); }
.help-links a:hover { color: var(--brand-dark); }
.help-empty { display: none; padding: 28px; border: 1px solid var(--line); color: var(--muted); }
.article-meta { margin: -10px 0 32px; color: var(--muted); font-size: 14px; }
#article-root h1 { max-width: 820px; font-size: clamp(36px, 4.2vw, 52px); }
#article-root > .container { min-height: 560px; }
.article-body { max-width: 820px; }
.article-body h2 { margin-top: 44px; font-size: 28px; }
.article-body h3 { margin-top: 30px; font-size: 20px; }
.article-body p, .article-body li { color: var(--muted); }
.article-body li + li { margin-top: 9px; }
.article-body table { width: 100%; margin: 24px 0; border-collapse: collapse; }
.article-body th, .article-body td { padding: 12px 14px; border: 1px solid var(--line); text-align: left; }
.article-body th { background: var(--surface); }
.article-source { margin-top: 48px; padding: 20px; border-left: 4px solid var(--brand); background: var(--surface-warm); }
.login-stage { padding: 72px 0 82px; overflow: hidden; background: linear-gradient(120deg, #fff 0 52%, #fff3e8 52% 100%); }
.login-stage-grid { display: grid; grid-template-columns: minmax(0, 1fr) 480px; gap: 80px; align-items: center; }
.login-copy h1 { margin-bottom: 24px; font-size: clamp(44px, 5vw, 64px); }
.login-copy .lead { max-width: 620px; }
.login-benefits { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 30px; }
.login-benefits span { padding: 7px 12px; border: 1px solid #f0c9aa; background: rgba(255,255,255,.72); color: #574d45; font-size: 14px; }
.login-widget { overflow: hidden; border: 1px solid #d7d9dc; background: white; box-shadow: 0 22px 60px rgba(57, 35, 19, .12); }
.login-widget-head { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.login-widget-head strong, .login-widget-head span { display: block; }
.login-widget-head span { color: var(--muted); font-size: 12px; }
.login-widget-head a { flex: 0 0 auto; color: var(--brand-dark); font-size: 13px; text-decoration: none; }
.login-widget-frame { display: block; width: 1280px; height: 660px; border: 0; background: white; transform: translateX(-560px) scale(.85); transform-origin: left top; }
.login-panel { overflow: hidden; border: 1px solid #d7d9dc; background: white; box-shadow: 0 22px 60px rgba(57, 35, 19, .12); }
.login-panel-head { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 14px 20px; border-bottom: 1px solid var(--line); }
.login-panel-head strong, .login-panel-head span { display: block; }
.login-panel-head span { color: var(--muted); font-size: 12px; }
.login-panel-head a { flex: 0 0 auto; color: var(--brand-dark); font-size: 13px; text-decoration: none; }
.login-panel-viewport { height: 430px; overflow: hidden; background: #eef7ff; }
.login-panel-frame { display: block; width: 1280px; height: 660px; border: 0; background: white; transform: translate(-560px, -55px) scale(.85); transform-origin: left top; }
.login-help { padding: 72px 0; background: var(--surface); }
.login-help-card { min-height: 170px; display: flex; flex-direction: column; justify-content: space-between; padding: 28px; background: white; text-decoration: none; }
.login-help-card strong { font-size: 20px; }
.login-help-card span { color: var(--muted); }
.login-help-card:hover strong { color: var(--brand-dark); }
.login-footer { padding-top: 0; }
.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { min-height: 62px; display: flex; align-items: center; cursor: pointer; font-weight: 600; }
.faq details p { max-width: 860px; margin: 0 0 24px; color: var(--muted); }
.login-shell { min-height: calc(100vh - 102px); background: #eef0f2; }
.login-intro { padding: 34px 0 24px; }
.login-intro h1 { margin-bottom: 8px; font-size: 34px; }
.login-intro p { margin: 0; color: var(--muted); }
.login-frame-wrap { margin-bottom: 42px; border: 1px solid #cfd2d5; background: white; }
.login-safe { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 12px 16px; background: #fff9f3; border-bottom: 1px solid #f2d0b7; font-size: 14px; }
.login-safe strong { color: var(--success); }
.login-frame { display: block; width: 100%; height: 720px; border: 0; background: white; }
.footer { padding: 62px 0 28px; background: #171717; color: #c9c9c9; }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 50px; }
.footer h3 { color: white; font-size: 16px; }
.footer a { display: block; margin: 7px 0; color: #c9c9c9; text-decoration: none; }
.footer a:hover { color: white; }
.footer-bottom { margin-top: 44px; padding-top: 22px; border-top: 1px solid #3a3a3a; font-size: 13px; }
.footer-note { max-width: 430px; font-size: 13px; }

@media (max-width: 900px) {
  .container { width: min(100% - 32px, var(--max)); }
  .utility .container { padding: 6px 0; }
  .utility .desktop-only { display: none; }
  .menu-button { display: block; }
  .nav { position: absolute; left: 0; right: 0; top: 68px; display: none; flex-direction: column; align-items: stretch; padding: 12px 16px 20px; background: white; border-bottom: 1px solid var(--line); }
  .nav.open { display: flex; }
  .nav a { padding: 0 12px; }
  .nav-login { margin: 6px 0 0; }
  .hero-grid { grid-template-columns: 1fr; min-height: auto; padding: 70px 0; }
  .hero-panel { min-height: 330px; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .grid-3, .product-grid, .price-grid { grid-template-columns: 1fr; }
  .detail-layout { grid-template-columns: 1fr; gap: 46px; }
  .detail-aside { position: static; }
  .help-groups { grid-template-columns: 1fr; }
  .feature-list { grid-template-columns: 1fr; }
  .band .container { align-items: flex-start; flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .login-safe { align-items: flex-start; flex-direction: column; }
  .login-frame { height: 680px; }
  .login-stage { padding: 54px 0 64px; background: linear-gradient(180deg, #fff 0 43%, #fff3e8 43% 100%); }
  .login-stage-grid { grid-template-columns: 1fr; gap: 44px; }
  .login-widget { width: min(100%, 560px); }
  .login-panel { width: min(100%, 560px); }
}

@media (max-width: 560px) {
  h1 { font-size: 40px; }
  .section { padding: 64px 0; }
  .hero-grid { padding: 54px 0; gap: 40px; }
  .hero-panel { padding: 22px; min-height: 300px; }
  .mail-window { margin-top: 28px; }
  .mail-body { grid-template-columns: 62px 1fr; }
  .stats { grid-template-columns: 1fr; }
  .stat, .stat:nth-child(2) { border-right: 0; border-bottom: 1px solid var(--line); }
  .stat:last-child { border-bottom: 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .capability-grid { grid-template-columns: 1fr; }
  .help-group { padding: 22px; }
  .login-frame { height: 620px; }
  .login-copy h1 { font-size: 42px; }
  .login-widget-head { align-items: flex-start; }
  .login-widget-frame { height: 540px; }
  .login-widget-frame { width: 1280px; height: 680px; transform: translateX(-590px) scale(.8); }
  .login-panel-viewport { height: 430px; }
  .login-panel-frame { width: 1280px; height: 680px; transform: translate(-590px, -55px) scale(.8); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}