:root {
  --bg: #f5faff;
  --panel: #ffffff;
  --panel-soft: #edf6ff;
  --accent: #1677ff;
  --accent-soft: #e8f2ff;
  --text: #102a43;
  --muted: #5b7083;
  --line: #b9d8ff;
  --shadow: 0 12px 30px rgba(22, 119, 255, 0.10);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background: radial-gradient(circle at 12% 0%, #e0f0ff 0, var(--bg) 34rem);
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

a { color: inherit; }

a:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
}

.header-inner,
.page-shell {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 72px;
}

.brand {
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark { color: var(--accent); }

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.nav-link {
  padding: 7px 10px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--text);
  background: var(--accent-soft);
}

.page-shell { padding: 54px 0 72px; }

.auth-shell { display: grid; min-height: calc(100vh - 81px); place-items: center; width: min(100% - 40px, 480px); margin: 0 auto; padding: 48px 0; }
.auth-card { width: 100%; padding: 32px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); box-shadow: var(--shadow); }
.auth-card h1 { margin: 0 0 12px; font-size: clamp(1.6rem, 4vw, 2rem); }
.auth-card > p:not(.eyebrow):not(.auth-error) { margin: 0 0 24px; color: var(--muted); }
.auth-card form { display: grid; gap: 10px; }
.auth-card label { font-weight: 700; }
.auth-card input { width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; color: var(--text); background: var(--page); font: inherit; }
.auth-card input:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
.auth-card button { margin-top: 6px; padding: 12px 16px; border: 0; border-radius: 10px; color: #fff; background: var(--accent); font: inherit; font-weight: 800; cursor: pointer; }
.auth-card button:hover { filter: brightness(1.08); }
.auth-error { margin: 0 0 16px; padding: 10px 12px; border: 1px solid #f5b4b4; border-radius: 10px; color: #b42318; background: #fff1f0; }
.back-link { display: inline-block; margin-top: 20px; color: var(--accent); font-weight: 700; }

.intro { max-width: 760px; margin-bottom: 34px; }

.product-hero, .home-hero { display: grid; grid-template-columns: minmax(0, 1fr) 132px; align-items: start; gap: 24px; margin-bottom: 34px; }
.product-hero .intro, .home-hero .intro { margin-bottom: 0; }
.contact-quick { width: 132px; min-width: 132px; padding: 8px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); text-align: center; }
.contact-quick img { display: block; width: 112px; height: 112px; margin: 0 auto; border-radius: 6px; }
.contact-quick p { margin: 6px 0 1px; color: var(--muted); font-size: 0.72rem; }
.contact-quick strong { color: var(--accent); font-size: 0.74rem; overflow-wrap: anywhere; }
.contact-quick button { display: block; width: 100%; margin-top: 8px; padding: 5px 2px; border: 1px solid var(--accent); border-radius: 6px; color: var(--accent); background: #fff; cursor: pointer; font: inherit; font-size: 0.72rem; font-weight: 700; }
.contact-quick button:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.contact-quick [role="status"] { display: block; min-height: 1.2em; font-size: 0.65rem; line-height: 1.2; }

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

h1, h2, p { margin-top: 0; }

h1 {
  margin-bottom: 12px;
  font-size: clamp(2rem, 5vw, 3.7rem);
  line-height: 1.14;
  letter-spacing: -0.04em;
}

h2 { font-size: 1.38rem; line-height: 1.3; }

.lead { max-width: 680px; color: var(--muted); font-size: 1.08rem; }

.quick-links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }

.quick-link,
.official-link {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--text);
  font-weight: 800;
  text-decoration: none;
}

.quick-link:hover,
.official-link:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.product-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(145deg, #ffffff, #edf6ff);
  box-shadow: var(--shadow);
}

.product-card img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.product-card-body { padding: 18px; }

.product-card h2 { margin-bottom: 10px; font-size: 1.08rem; }

.product-price { margin-bottom: 14px; color: var(--accent); font-size: 1.2rem; font-weight: 800; }
.availability-note { margin: 0; color: #9a3412; font-size: 0.88rem; font-weight: 700; }

.product-card .official-link { min-height: 38px; padding: 7px 11px; }

.faq-list { display: grid; gap: 18px; }
.faq-card { padding: 26px; border: 1px solid var(--line); border-radius: 18px; background: linear-gradient(145deg, #ffffff, #edf6ff); box-shadow: var(--shadow); }
.faq-details summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; cursor: pointer; color: var(--text); font-size: 1.38rem; font-weight: 800; list-style: none; }
.faq-details summary::-webkit-details-marker { display: none; }
.faq-toggle { flex: 0 0 auto; padding: 6px 10px; border: 1px solid var(--line); border-radius: 8px; color: var(--accent); background: var(--accent-soft); font-size: 0.82rem; }
.faq-details[open] .faq-toggle { font-size: 0; }
.faq-details[open] .faq-toggle::after { content: attr(data-collapse-label); font-size: 0.82rem; }
.faq-answer { padding-top: 18px; }
.faq-answer p { max-width: 760px; margin-bottom: 20px; color: var(--muted); }
.faq-answer ol { margin: 0 0 18px; padding-left: 1.45rem; color: var(--muted); }
.faq-answer li + li { margin-top: 8px; }
.faq-answer strong { color: var(--text); }
.faq-note { font-size: 0.92rem; }
.faq-answer img { display: block; width: min(100%, 560px); height: auto; margin: 0 auto; border: 1px solid var(--line); border-radius: 14px; }

.guide-card,
.notice,
.contact-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(145deg, #ffffff, #edf6ff);
  box-shadow: var(--shadow);
}

.guide-card {
  padding: 26px;
  scroll-margin-top: 160px;
}

.guide-card h2 { margin-bottom: 14px; }

.guide-card ol { margin: 0 0 20px; padding-left: 1.45rem; color: var(--muted); }

.guide-card li + li { margin-top: 8px; }

.guide-section { margin: 34px 0; scroll-margin-top: 150px; }
.section-heading { margin-bottom: 18px; }
.section-heading h2 { margin-bottom: 8px; }
.section-heading p:not(.eyebrow), .guide-card p, .guide-note { color: var(--muted); }
.guide-card h3 { margin-bottom: 10px; font-size: 1.08rem; }
.guide-card p { margin-bottom: 16px; }
.guide-visual { display: block; color: var(--accent); font-size: 0.9rem; font-weight: 800; text-decoration: none; }
.guide-visual img { display: block; width: min(100%, 420px); height: auto; margin-bottom: 9px; border: 1px solid var(--line); border-radius: 12px; transition: border-color 160ms ease, transform 160ms ease; }
.guide-visual:hover img, .guide-visual:focus-visible img { border-color: var(--accent); transform: translateY(-2px); }
.guide-note { margin-top: 16px; font-size: 0.92rem; }
.image-preview { width: min(960px, calc(100% - 32px)); max-width: calc(100% - 32px); max-height: calc(100dvh - 32px); padding: 16px; overflow: auto; border: 1px solid var(--line); border-radius: 18px; background: #fff; box-shadow: var(--shadow); }
.image-preview::backdrop { background: rgba(16, 42, 67, 0.76); }
.image-preview-close { display: block; margin: 0 0 12px auto; padding: 8px 16px; border: 1px solid var(--line); border-radius: 9px; color: var(--text); background: var(--panel); font: inherit; font-weight: 700; cursor: pointer; }
.image-preview-close:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.image-preview img { display: block; max-width: 100%; max-height: calc(100dvh - 110px); width: auto; height: auto; margin: 0 auto; object-fit: contain; }

.official-link { color: var(--accent); }

.notice {
  margin-top: 22px;
  padding: 20px 22px;
  color: var(--muted);
}

.notice strong { color: var(--text); }

.contact-layout {
  display: grid;
  place-items: center;
  min-height: 58vh;
}

.contact-card {
  width: min(100%, 560px);
  padding: 34px;
  text-align: center;
}

.contact-card h1 { margin-bottom: 16px; font-size: clamp(1.9rem, 5vw, 3rem); }

.wechat-id {
  display: inline-block;
  margin: 0 0 28px;
  padding: 10px 14px;
  border: 1px solid rgba(33, 212, 181, 0.46);
  border-radius: 10px;
  color: var(--accent);
  background: var(--accent-soft);
  font-size: clamp(1rem, 3vw, 1.2rem);
  font-weight: 800;
  overflow-wrap: anywhere;
}

.qr-frame {
  display: inline-block;
  max-width: 100%;
  padding: 14px;
  border-radius: 18px;
  background: #fff;
}

.qr-image {
  display: block;
  width: min(100%, 380px);
  height: auto;
  border-radius: 8px;
}

.footer { padding-top: 32px; color: var(--muted); font-size: 1rem; text-align: center; }

@media (max-width: 700px) {
  .header-inner { align-items: flex-start; flex-direction: column; padding: 14px 0; }
  .site-nav { justify-content: flex-start; }
  .page-shell { width: min(100% - 28px, 1120px); padding-top: 36px; }
  .auth-shell { width: min(100% - 28px, 480px); padding: 32px 0; }
  .auth-card { padding: 24px; }
  .product-hero, .home-hero { grid-template-columns: 1fr; gap: 16px; }
  .contact-quick { width: min(100%, 320px); min-width: 0; padding: 12px; }
  .contact-quick img { width: 100px; height: 100px; }
  .contact-quick p, .contact-quick strong, .contact-quick button { font-size: 0.9rem; }
  .guide-grid, .product-grid { grid-template-columns: 1fr; }
  .guide-card, .contact-card { padding: 22px; }
}