/* 键盘支持页：轻色分区、完整步骤与可直接找到的联系方式。 */
:root {
  color-scheme: light;
  --ink: #17353c;
  --muted: #53676c;
  --paper: #f8faf9;
  --surface: #ffffff;
  --charcoal: #17353c;
  --warm-white: #f8faf9;
  --accent: #2f675f;
  --accent-hover: #24554f;
  --line: rgba(23, 53, 60, 0.13);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 112px; }
body {
  min-width: 0;
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; border-radius: 3px; }
h1, h2, h3, p, dl, dd { margin-top: 0; }
h1, h2, h3 { font-family: inherit; font-weight: 650; }

.site-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid var(--line); background: rgba(248, 250, 249, 0.96); backdrop-filter: blur(16px); }
.nav { display: flex; width: min(1160px, calc(100% - 48px)); min-height: 76px; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px 28px; margin: 0 auto; padding: 12px 0; }
.brand, .brand img { display: block; width: 180px; max-width: 100%; height: auto; }
.brand { flex: 0 0 auto; }
.nav-links { display: flex; align-items: center; flex-wrap: wrap; gap: 4px 20px; color: var(--ink); font-size: 14px; }
.nav-links a { display: inline-flex; min-height: 40px; align-items: center; }
.nav-links a:hover { color: var(--accent); }

.support-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(300px, 0.85fr);
  gap: 64px;
  align-items: center;
  padding: 76px max(24px, calc((100vw - 1160px) / 2));
  border-bottom: 1px solid var(--line);
  background: linear-gradient(110deg, #ffffff 0%, #f2f8f5 62%, #f0eef8 100%);
  color: var(--ink);
}
.support-hero > * { min-width: 0; }
.eyebrow { margin-bottom: 18px; color: var(--accent); font-size: 13px; font-weight: 650; letter-spacing: 0.02em; }
h1 { margin-bottom: 24px; font-size: clamp(38px, 4.4vw, 62px); line-height: 1.3; letter-spacing: -0.025em; }
.hero-lead { max-width: 640px; margin-bottom: 20px; color: var(--muted); font-size: 17px; line-height: 1.8; }
.support-hero > div > p:not(.eyebrow) { max-width: 660px; color: var(--muted); font-size: 16px; line-height: 1.8; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 18px 28px; margin-top: 30px; }
.primary-button { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; border: 1px solid var(--accent); border-radius: 8px; padding: 10px 22px; background: var(--accent); color: #ffffff; font-size: 15px; font-weight: 650; transition: background 160ms ease; }
.primary-button:hover { background: var(--accent-hover); color: #ffffff; }
.text-link { display: inline-flex; min-height: 40px; align-items: center; border-bottom: 1px solid currentColor; color: var(--ink); font-size: 15px; font-weight: 600; }
.text-link:hover { color: var(--accent); }
.hero-card { min-width: 0; border: 1px solid var(--line); border-radius: 20px; padding: 30px; background: rgba(255, 255, 255, 0.9); box-shadow: 0 16px 48px rgba(23, 53, 60, 0.035); }
.hero-card > p { margin-bottom: 0; color: var(--muted); font-size: 13px; font-weight: 600; }
.hero-product-identity { display: flex; align-items: center; gap: 18px; margin: 22px 0 26px; }
.hero-product-icon { display: block; flex: 0 0 auto; width: 64px; height: 64px; border: 1px solid var(--line); border-radius: 22%; object-fit: cover; }
.hero-product-identity strong { display: block; min-width: 0; font-family: inherit; font-size: 26px; font-weight: 650; line-height: 1.4; }
.hero-card dl { margin-bottom: 0; }
.hero-card dl div { display: grid; grid-template-columns: 78px minmax(0, 1fr); gap: 12px; border-top: 1px solid var(--line); padding: 14px 0; }
.hero-card dt, .hero-card dd { font-size: 14px; line-height: 1.7; }
.hero-card dt { color: var(--muted); }
.hero-card dd { margin-left: 0; overflow-wrap: anywhere; color: var(--ink); }
.hero-card dd a { color: var(--accent); text-decoration: underline; text-underline-offset: 4px; }

.content-section, .contact-section, .faq-section { scroll-margin-top: 0; padding: 76px max(24px, calc((100vw - 1160px) / 2)); }
.section-heading { display: grid; grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr); gap: 14px 64px; margin-bottom: 36px; }
.section-heading .eyebrow { grid-column: 1 / -1; margin-bottom: 0; }
h2 { margin-bottom: 0; font-size: clamp(30px, 3.4vw, 44px); line-height: 1.4; letter-spacing: -0.02em; }
.section-heading > p:last-child { align-self: end; margin-bottom: 4px; color: var(--muted); font-size: 16px; line-height: 1.8; }
.steps { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin: 0; padding: 0; list-style: none; }
.steps li { display: grid; grid-template-columns: 34px minmax(0, 1fr); align-content: start; gap: 18px; border: 1px solid var(--line); border-radius: 16px; padding: 28px; background: var(--surface); }
.steps li > span { color: var(--accent); font-size: 15px; font-weight: 650; }
.steps h3, .faq-grid h3 { margin-bottom: 12px; font-size: 19px; line-height: 1.55; }
.steps p, .faq-grid p { margin-bottom: 0; overflow-wrap: anywhere; color: var(--muted); font-size: 16px; line-height: 1.8; }
.faq-section { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #ecf5f0; color: var(--ink); }
.faq-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid var(--line); }
.faq-grid article { min-width: 0; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 30px; }
.faq-grid article:nth-child(even) { border-right: 0; }
.faq-grid p + p { margin-top: 12px; }
.contact-section { display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, 0.8fr); gap: 64px; align-items: center; }
.contact-section > * { min-width: 0; }
.contact-section h2 { margin-bottom: 20px; }
.contact-section > div > p:not(.eyebrow) { max-width: 690px; color: var(--muted); font-size: 16px; line-height: 1.8; }
.contact-section > div > p.privacy-note { margin-bottom: 0; color: var(--accent); font-size: 14px; }
.contact-card { display: flex; min-height: 196px; flex-direction: column; justify-content: space-between; gap: 18px; border: 1px solid var(--line); border-radius: 16px; padding: 28px; background: #f0eef8; transition: border-color 160ms ease, background 160ms ease; }
.contact-card:hover { border-color: var(--accent); background: #f6f3fa; }
.contact-card > span { color: var(--muted); font-size: 14px; }
.contact-card strong { overflow-wrap: anywhere; color: var(--accent); font-size: clamp(20px, 2.2vw, 26px); line-height: 1.5; }
.contact-card small { font-size: 14px; font-weight: 650; }

.site-footer { display: flex; align-items: flex-start; justify-content: space-between; gap: 32px; border-top: 1px solid var(--line); padding: 42px max(24px, calc((100vw - 1160px) / 2)); background: #ffffff; color: var(--ink); }
.site-footer > * { min-width: 0; }
.site-footer img { display: block; width: 204px; max-width: 100%; height: auto; }
.footer-copy { text-align: right; }
.footer-links { display: flex; justify-content: flex-end; flex-wrap: wrap; gap: 8px 18px; margin-bottom: 14px; font-size: 14px; }
.footer-links a { color: var(--ink); }
.footer-links a:hover { color: var(--accent); }
.footer-copy p { margin-bottom: 6px; overflow-wrap: anywhere; color: var(--muted); font-size: 13px; line-height: 1.7; }

@media (max-width: 900px) {
  .support-hero, .section-heading, .contact-section { grid-template-columns: 1fr; }
  .support-hero { gap: 36px; padding: 56px 24px; }
  .hero-card { width: min(580px, 100%); }
  .section-heading, .contact-section { gap: 24px; }
  .content-section, .faq-section, .contact-section { padding: 56px 24px; }
  .site-footer { flex-direction: column; padding: 36px 24px; }
  .footer-copy { text-align: left; }
  .footer-links { justify-content: flex-start; }
}
@media (max-width: 650px) {
  .support-hero { padding: 44px 20px; }
  h1 { font-size: clamp(34px, 9vw, 48px); }
  .hero-lead { font-size: 16px; }
  .content-section, .faq-section, .contact-section { scroll-margin-top: 0; padding: 48px 20px; }
  .steps, .faq-grid { grid-template-columns: 1fr; }
  .steps li { grid-template-columns: 26px minmax(0, 1fr); gap: 14px; padding: 22px; }
  .faq-grid article, .faq-grid article:nth-child(even) { border-right: 0; padding: 24px 0; }
  .hero-card, .contact-card { padding: 24px; }
  .hero-product-icon { width: 56px; height: 56px; }
  .hero-product-identity { gap: 14px; }
  .hero-product-identity strong { font-size: 24px; }
  .site-footer { padding: 34px 20px; }
}
@media (max-width: 380px) {
  .hero-card dl div { grid-template-columns: 1fr; gap: 4px; }
  .hero-actions { align-items: flex-start; flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}