@charset "utf-8";
/* ==========================================================================
   电商助手官网 V2 · site.css
   基调：极简白底大留白（Apple 式），单品牌蓝，零 Web Font，零渐变，零绿色
   ========================================================================== */

/* ── 设计令牌 ─────────────────────────────────────────────── */
:root {
  --c-bg: #ffffff;
  --c-surface: #f5f5f7;
  --c-text: #1d1d1f;
  --c-muted: #6e6e73;
  --c-border: #e3e3e8;
  --c-brand: #3b6fb5;
  --c-brand-hover: #325e9e;
  --c-brand-light: #eff3f9;
  --font-sans: "Segoe UI", "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  --container: 1080px;
  --radius: 14px;
  --sp-section: 96px;
}

/* ── 基础重置 ─────────────────────────────────────────────── */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
}
body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--c-brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ── 导航 ─────────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--c-border);
}
.nav__inner {
  max-width: var(--container); margin: 0 auto; padding: 0 24px;
  height: 56px; display: flex; align-items: center; gap: 32px;
}
.nav__brand { display: flex; align-items: center; gap: 10px; color: var(--c-text); font-weight: 600; font-size: 17px; }
.nav__brand:hover { text-decoration: none; }
.nav__brand img { width: 26px; height: 26px; }
.nav__links { display: flex; align-items: center; gap: 28px; margin-left: auto; }
.nav__links a { color: var(--c-muted); font-size: 15px; }
.nav__links a:hover { color: var(--c-text); text-decoration: none; }
.nav__links a.is-current { color: var(--c-text); }
/* 按钮不受导航灰色链接规则影响（specificity 修复） */
.nav__links a.btn--primary,
.nav__links a.btn--primary:hover { color: #fff; }
.nav__cta { margin-left: 8px; }
.nav__burger {
  display: none; margin-left: auto; border: 0; background: none; cursor: pointer;
  width: 40px; height: 40px; color: var(--c-text);
}
.nav__burger svg { width: 22px; height: 22px; stroke: currentColor; stroke-width: 2; fill: none; stroke-linecap: round; }

.menu { display: none; border-bottom: 1px solid var(--c-border); background: #fff; }
.menu.is-open { display: block; }
.menu a { display: block; padding: 14px 24px; color: var(--c-text); font-size: 16px; border-top: 1px solid var(--c-border); }
.menu a:hover { background: var(--c-surface); text-decoration: none; }

/* ── 按钮 ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 28px; border-radius: 999px;
  font-size: 16px; font-weight: 600; line-height: 1.4;
  transition: background-color 150ms ease, color 150ms ease, border-color 150ms ease;
  cursor: pointer; border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }
.btn--primary { background: var(--c-brand); color: #fff; }
.btn--primary:hover { background: var(--c-brand-hover); }
.btn--ghost { border-color: var(--c-border-strong, #b9b9c0); color: var(--c-text); }
.btn--ghost:hover { border-color: var(--c-text); }
.btn--sm { padding: 7px 18px; font-size: 14px; }
.btn--lg { padding: 14px 36px; font-size: 17px; }

/* ── 区块骨架 ─────────────────────────────────────────────── */
.section { padding: var(--sp-section) 0 0; }
.section--surface { background: var(--c-surface); margin-top: var(--sp-section); padding: var(--sp-section) 0; }
.section__head { max-width: 720px; margin: 0 auto 56px; text-align: center; }
.section__kicker { display: block; color: var(--c-brand); font-size: 14px; font-weight: 600; letter-spacing: 0.08em; margin-bottom: 12px; }
h1, h2, h3 { line-height: 1.3; letter-spacing: -0.01em; }
.section__title { font-size: clamp(28px, 4vw, 40px); font-weight: 700; }
.section__sub { color: var(--c-muted); font-size: 18px; margin-top: 14px; }

/* ── Hero ─────────────────────────────────────────────────── */
.hero { padding: 108px 0 0; text-align: center; }
.hero__badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--c-brand-light); color: var(--c-brand);
  font-size: 14px; font-weight: 600; padding: 6px 16px; border-radius: 999px;
}
.hero__title { font-size: clamp(34px, 6vw, 60px); font-weight: 700; margin: 24px auto 0; max-width: 820px; }
.hero__sub { color: var(--c-muted); font-size: clamp(17px, 2vw, 21px); max-width: 640px; margin: 20px auto 0; }
.hero__cta { display: flex; justify-content: center; gap: 16px; margin-top: 36px; flex-wrap: wrap; }
.hero__note { color: var(--c-muted); font-size: 14px; margin-top: 18px; }
.hero__visual { margin-top: 64px; }

/* ── 截图框 / 占位 ────────────────────────────────────────── */
.shot-frame {
  border: 1px solid var(--c-border); border-radius: var(--radius);
  overflow: hidden; background: var(--c-surface);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.08);
}
.shot-frame img { width: 100%; }
.shot-cap { text-align: center; color: var(--c-muted); font-size: 13px; margin-top: 12px; }
.shot-ph {
  aspect-ratio: 16 / 10; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 10px;
  border: 1.5px dashed #c4c4cc; border-radius: var(--radius);
  background: var(--c-surface); color: var(--c-muted);
}
.shot-ph svg { width: 40px; height: 40px; stroke: #a8a8b0; stroke-width: 1.5; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.shot-ph strong { color: var(--c-text); font-size: 16px; font-weight: 600; }
.shot-ph span { font-size: 13px; }

/* ── 功能总览：三段流程 ───────────────────────────────────── */
.stages { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.stage {
  background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius);
  padding: 32px 28px;
}
.section--surface .stage { background: #fff; }
.stage__label { display: inline-block; font-size: 13px; font-weight: 600; color: var(--c-brand); background: var(--c-brand-light); padding: 4px 12px; border-radius: 999px; }
.stage__list { list-style: none; margin-top: 20px; display: grid; gap: 24px; }
.feat__name { display: flex; align-items: center; gap: 10px; font-size: 17px; font-weight: 600; }
.feat__name svg { width: 20px; height: 20px; stroke: var(--c-brand); stroke-width: 1.8; fill: none; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.feat__line { color: var(--c-muted); font-size: 15px; margin-top: 6px; padding-left: 30px; }

/* ── 功能深讲：左文右图 ───────────────────────────────────── */
.feature-row {
  display: grid; grid-template-columns: 5fr 7fr; gap: 56px; align-items: center;
  padding: 56px 0;
}
.feature-row--flip .feature-row__text { order: 2; }
.feature-row--flip .feature-row__media { order: 1; }
.feature-row__text .badge { margin-bottom: 16px; }
.feature-row__title { font-size: clamp(24px, 3vw, 32px); font-weight: 700; }
.feature-row__title + .feature-row__desc { color: var(--c-muted); margin-top: 12px; font-size: 17px; }
.ticks { list-style: none; margin-top: 24px; display: grid; gap: 14px; }
.ticks li { display: flex; gap: 12px; align-items: flex-start; font-size: 16px; }
.ticks svg { width: 18px; height: 18px; stroke: var(--c-brand); stroke-width: 2.2; fill: none; stroke-linecap: round; stroke-linejoin: round; flex: none; margin-top: 5px; }
.ticks strong { font-weight: 600; }
.note { color: var(--c-muted); font-size: 14px; margin-top: 20px; }

/* ── 徽标 ─────────────────────────────────────────────────── */
.badge { display: inline-block; font-size: 13px; font-weight: 600; padding: 4px 12px; border-radius: 999px; }
.badge--ok { background: var(--c-brand-light); color: var(--c-brand); }
.badge--wip { background: #fdf3e0; color: #8a5a10; }

/* ── 信任条 ───────────────────────────────────────────────── */
.trust { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; text-align: center; }
.trust__item strong { display: block; font-size: 19px; font-weight: 600; }
.trust__item span { color: var(--c-muted); font-size: 15px; margin-top: 6px; display: block; }

/* ── FAQ ──────────────────────────────────────────────────── */
.faq { max-width: 720px; margin: 0 auto; }
.faq details { border-bottom: 1px solid var(--c-border); }
.faq summary {
  list-style: none; cursor: pointer; display: flex; justify-content: space-between;
  align-items: center; gap: 16px; padding: 20px 4px; font-size: 17px; font-weight: 600;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--c-muted); font-size: 22px; font-weight: 400; flex: none; }
.faq details[open] summary::after { content: "−"; }
.faq__a { color: var(--c-muted); padding: 0 4px 20px; font-size: 16px; }

/* ── CTA 带 ───────────────────────────────────────────────── */
.cta-band { text-align: center; padding: 40px 0 0; }
.cta-band h2 { font-size: clamp(26px, 4vw, 40px); font-weight: 700; }
.cta-band p { color: var(--c-muted); margin: 14px 0 28px; }

/* ── 下载页 ───────────────────────────────────────────────── */
.page-head { padding: 88px 0 0; text-align: center; max-width: 720px; margin: 0 auto; }
.page-head h1 { font-size: clamp(30px, 5vw, 48px); font-weight: 700; }
.page-head p { color: var(--c-muted); font-size: 18px; margin-top: 14px; }
.dl-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 56px; }
.dl-card {
  border: 1px solid var(--c-border); border-radius: var(--radius);
  padding: 36px 32px; text-align: center; background: #fff;
  display: flex; flex-direction: column; align-items: center;
}
.dl-card--primary { border-color: var(--c-brand); box-shadow: 0 12px 32px rgba(59, 111, 181, 0.12); }
.dl-card__tag { font-size: 13px; font-weight: 600; color: var(--c-brand); }
.dl-card h3 { font-size: 22px; }
.dl-card__meta { color: var(--c-muted); font-size: 14px; margin: 10px 0 24px; }
.dl-card .btn { min-width: 200px; }
.dl-code { margin-top: 18px; font-size: 15px; color: var(--c-muted); }
.dl-code strong { color: var(--c-text); font-size: 17px; letter-spacing: 0.06em; }
.btn-copy {
  margin-left: 10px; padding: 4px 12px; border: 1px solid var(--c-border);
  border-radius: 6px; background: #fff; color: var(--c-text);
  font-size: 13px; font-family: inherit; cursor: pointer;
  transition: border-color 150ms ease, color 150ms ease;
}
.btn-copy:hover, .btn-copy.is-done { border-color: var(--c-brand); color: var(--c-brand); }
.spec-table { width: 100%; border-collapse: collapse; max-width: 720px; margin: 0 auto; }
.spec-table th, .spec-table td { text-align: left; padding: 14px 16px; border-bottom: 1px solid var(--c-border); font-size: 16px; vertical-align: top; }
.spec-table th { color: var(--c-muted); font-weight: 600; white-space: nowrap; width: 180px; }
.steps { list-style: none; counter-reset: step; max-width: 720px; margin: 0 auto; display: grid; gap: 20px; }
.steps li { counter-increment: step; display: flex; gap: 18px; align-items: flex-start; }
.steps li::before {
  content: counter(step); flex: none; width: 32px; height: 32px; border-radius: 50%;
  background: var(--c-brand); color: #fff; font-size: 15px; font-weight: 600;
  display: flex; align-items: center; justify-content: center; margin-top: 2px;
}
.steps strong { display: block; font-weight: 600; }
.steps span { color: var(--c-muted); font-size: 15px; }

/* ── 联系页 ───────────────────────────────────────────────── */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 56px; align-items: stretch; }
.contact-card { border: 1px solid var(--c-border); border-radius: var(--radius); padding: 36px 32px; text-align: center; }
.contact-card h3 { font-size: 20px; margin-top: 0; }
.contact-card__qr { width: 208px; height: 208px; margin: 24px auto; border-radius: 12px; border: 1px solid var(--c-border); }
.contact-card__phone { font-size: 26px; font-weight: 700; letter-spacing: 0.02em; margin: 18px 0 4px; }
.contact-card p { color: var(--c-muted); font-size: 15px; }
.ask-list { list-style: none; max-width: 720px; margin: 24px auto 0; display: grid; gap: 12px; }
.ask-list li { display: flex; gap: 12px; align-items: flex-start; font-size: 16px; }
.ask-list svg { width: 18px; height: 18px; stroke: var(--c-brand); stroke-width: 2.2; fill: none; stroke-linecap: round; stroke-linejoin: round; flex: none; margin-top: 5px; }

/* ── 条款页 ───────────────────────────────────────────────── */
.terms { max-width: 720px; margin: 0 auto; }
.terms h2 { font-size: 21px; margin: 40px 0 10px; }
.terms p, .terms li { color: var(--c-muted); font-size: 16px; }
.terms ul { padding-left: 22px; margin-top: 8px; }
.terms strong { color: var(--c-text); }

/* ── 页脚 ─────────────────────────────────────────────────── */
.footer { margin-top: 96px; border-top: 1px solid var(--c-border); background: var(--c-surface); }
.footer__inner {
  max-width: var(--container); margin: 0 auto; padding: 40px 24px;
  display: flex; flex-wrap: wrap; gap: 16px 40px; align-items: center; justify-content: space-between;
}
.footer__brand { display: flex; align-items: center; gap: 10px; font-weight: 600; color: var(--c-text); }
.footer__brand img { width: 22px; height: 22px; }
.footer__links { display: flex; gap: 24px; font-size: 14px; }
.footer__links a { color: var(--c-muted); }
.footer__links a:hover { color: var(--c-text); text-decoration: none; }
.footer__legal { width: 100%; color: #6e6e73; font-size: 13px; }
.footer__legal a { color: #6e6e73; }
.footer__legal a:hover { color: var(--c-text); text-decoration: none; }
.footer__legal .gongan { display: inline-flex; align-items: center; gap: 4px; }
.footer__legal .gongan svg { flex: none; vertical-align: -2px; }

/* ── 动效：仅滚动淡入 1 项 ────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 500ms ease, transform 500ms ease; }
.reveal.is-in { opacity: 1; transform: none; }

/* 打印时强制显示全部内容（2026-09-20 审计修复） */
@media print {
  [data-reveal] { opacity: 1 !important; transform: none !important; }
  .nav, .menu { display: none !important; }
}

/* ── 响应式 ───────────────────────────────────────────────── */
@media (max-width: 900px) {
  :root { --sp-section: 64px; }
  .nav__links { display: none; }
  .nav__burger { display: flex; align-items: center; justify-content: center; }
  .stages { grid-template-columns: 1fr; }
  .feature-row, .feature-row--flip { grid-template-columns: 1fr; gap: 28px; padding: 40px 0; }
  .feature-row--flip .feature-row__text { order: 1; }
  .feature-row--flip .feature-row__media { order: 2; }
  .trust { grid-template-columns: 1fr; gap: 32px; }
  .dl-grid, .contact-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 72px; }
}
@media (max-width: 600px) {
  body { font-size: 16px; }
  .hero__cta .btn { width: 100%; }
  .hero__cta { gap: 12px; }
  .dl-card, .contact-card { padding: 28px 22px; }
  .spec-table th { width: auto; white-space: normal; }
  .spec-table th, .spec-table td { padding: 12px 8px; font-size: 15px; }
  .container { padding: 0 18px; }
  .footer__inner { padding: 32px 18px; }
}