/* site.css — 页面样式 */

/* ---------- 通用 ---------- */
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:clamp(18px,4vw,40px)}
.kicker{
  margin:0 0 .8em;
  font-size:.8125rem;
  font-weight:600;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--brand);
}
.text-link{display:inline-flex;align-items:center;gap:.35em;font-weight:600;font-size:.9375rem}
.text-link:hover{text-decoration:underline;text-underline-offset:3px}

/* ---------- 按钮 ---------- */
.action{
  display:inline-flex;
  align-items:center;
  gap:.5em;
  padding:.85em 1.4em;
  border:1px solid transparent;
  border-radius:var(--radius-sm);
  font-size:.9375rem;
  font-weight:600;
  line-height:1.2;
  transition:transform .16s ease,box-shadow .16s ease,background-color .16s ease;
}
.action .platform{
  padding:.18em .5em;
  border-radius:6px;
  font-size:.75rem;
  font-weight:700;
  letter-spacing:.02em;
  background:rgba(255,255,255,.22);
}
.action-primary{background:var(--brand);color:#fff;box-shadow:0 8px 20px rgba(37,99,235,.22)}
.action-primary:hover{background:var(--brand-dark);color:#fff;transform:translateY(-1px);box-shadow:0 12px 26px rgba(37,99,235,.28)}
.action-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.action-ghost .platform{background:var(--brand-soft);color:var(--brand-dark)}
.action-ghost:hover{border-color:#c7d8f5;color:var(--brand-dark);transform:translateY(-1px);box-shadow:var(--shadow)}

/* ---------- Header ---------- */
.header{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line);
}
.nav-shell{
  display:flex;
  align-items:center;
  gap:var(--gap);
  width:100%;
  max-width:var(--maxw);
  min-height:68px;
  margin-inline:auto;
  padding-inline:clamp(18px,4vw,40px);
}
.brand{display:inline-flex;align-items:center;gap:.55em;font-weight:700;color:var(--ink);font-size:1.0625rem;white-space:nowrap}
.brand img{width:32px;height:32px;border-radius:8px;object-fit:contain}
.main-nav{display:flex;align-items:center;gap:clamp(14px,2.2vw,30px);margin-left:auto}
.main-nav a{color:var(--text);font-size:.9375rem;font-weight:500;padding:.4em 0;border-bottom:2px solid transparent}
.main-nav a:hover{color:var(--brand);border-bottom-color:var(--brand)}
.nav-download{
  padding:.62em 1.1em;
  border-radius:999px;
  background:var(--brand);
  color:#fff;
  font-size:.875rem;
  font-weight:600;
  white-space:nowrap;
}
.nav-download:hover{background:var(--brand-dark);color:#fff}
.nav-menu{
  display:none;
  flex-direction:column;
  justify-content:center;
  gap:4px;
  width:40px;
  height:40px;
  padding:0 9px;
  border:1px solid var(--line);
  border-radius:10px;
  background:#fff;
}
.nav-menu span{display:block;height:2px;border-radius:2px;background:var(--ink);transition:transform .2s ease,opacity .2s ease}
.nav-menu[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-menu[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-menu[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ---------- Hero ---------- */
.hero{
  background:
    radial-gradient(900px 420px at 12% -10%,rgba(37,99,235,.10),transparent 65%),
    radial-gradient(700px 380px at 92% 8%,rgba(6,182,212,.12),transparent 62%),
    var(--bg);
  border-bottom:1px solid var(--line);
}
.hero-inner{
  display:grid;
  grid-template-columns:1.05fr .95fr;
  align-items:center;
  gap:clamp(32px,5vw,72px);
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding:clamp(48px,7vw,96px) clamp(18px,4vw,40px) clamp(32px,4vw,48px);
}
.hero-copy{max-width:600px}
.eyebrow{
  display:inline-block;
  margin:0 0 1em;
  padding:.35em .8em;
  border-radius:999px;
  background:var(--brand-soft);
  color:var(--brand-dark);
  font-size:.8125rem;
  font-weight:600;
  letter-spacing:.04em;
}
.hero h1{margin-bottom:.5em;letter-spacing:-.01em}
.hero-lede{font-size:1.0625rem;color:var(--muted);max-width:33em;margin-bottom:1.6em}
.download-actions{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:1.5em}
.hero-photo{margin:0}
.hero-photo img{width:100%;border-radius:var(--radius-lg)}
.side-caption{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 clamp(18px,4vw,40px) clamp(24px,3vw,40px);
  font-size:.8125rem;
  letter-spacing:.14em;
  color:#94a3b8;
  text-transform:uppercase;
}

/* ---------- Feature Main ---------- */
.feature-main{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding:clamp(56px,8vw,110px) clamp(18px,4vw,40px);
}
.section-intro{max-width:720px;margin-bottom:clamp(32px,4vw,56px)}
.section-intro h2{margin-bottom:.4em}
.section-intro p{color:var(--muted)}
.feature-guide{display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(16px,2vw,24px)}
.feature-guide article{
  padding:clamp(22px,2.4vw,30px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:#fff;
  transition:border-color .18s ease,box-shadow .18s ease,transform .18s ease;
}
.feature-guide article:hover{border-color:#c7d8f5;box-shadow:var(--shadow);transform:translateY(-2px)}
.guide-line{display:flex;align-items:center;gap:.6em;margin-bottom:.7em;color:var(--brand)}
.guide-line svg{flex:0 0 auto}
.guide-line h3{margin:0;color:var(--ink)}
.feature-guide p{font-size:.9375rem;color:var(--muted)}

/* ---------- Story ---------- */
.story{
  background:var(--bg-soft);
  border-block:1px solid var(--line);
  padding:clamp(56px,8vw,110px) clamp(18px,4vw,40px);
}
.story-head,.story-body{max-width:720px;margin-inline:auto}
.story-head{margin-bottom:1.4em}
.story-head h2{margin-bottom:0}
.story-body p{color:var(--muted)}

/* ---------- Proof ---------- */
.proof{padding:clamp(48px,7vw,96px) clamp(18px,4vw,40px)}
.proof-inner{max-width:var(--maxw);margin-inline:auto}
.proof h2{margin-bottom:1.6em;font-size:clamp(1.35rem,2.1vw,1.75rem);max-width:22em}
.proof-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(14px,2vw,24px)}
.proof-item{padding:22px clamp(16px,2vw,24px);border-radius:var(--radius);background:var(--bg-soft);border:1px solid var(--line)}
.proof-item strong{display:block;font-size:clamp(1.5rem,2.6vw,2rem);color:var(--brand-dark);line-height:1.2}
.proof-item span{font-size:.875rem;color:var(--muted)}

/* ---------- Download CTA ---------- */
.download-cta{
  padding:clamp(40px,5vw,64px) clamp(18px,4vw,40px);
  background:var(--bg-dark);
  color:#cbd5e1;
}
.cta-inner{
  max-width:780px;
  margin-inline:auto;
  padding:clamp(32px,5vw,56px) clamp(22px,4vw,48px);
  border-radius:var(--radius-lg);
  background:linear-gradient(150deg,rgba(255,255,255,.08),rgba(255,255,255,.02));
  border:1px solid rgba(255,255,255,.1);
  text-align:center;
}
.cta-inner h2{color:#fff;margin-bottom:.4em}
.cta-inner p{color:#a8b3c5;margin-bottom:1.6em}
.platform-group{display:flex;flex-wrap:wrap;gap:14px;justify-content:center}
.download-cta .action-ghost{background:rgba(255,255,255,.06);color:#e6edf9;border-color:rgba(255,255,255,.28)}
.download-cta .action-ghost .platform{background:rgba(255,255,255,.14);color:#fff}
.download-cta .action-ghost:hover{background:rgba(255,255,255,.12);color:#fff}

/* ---------- Footer ---------- */
.footer{background:#fff;border-top:1px solid var(--line);padding:clamp(32px,4vw,52px) clamp(18px,4vw,40px)}
.footer-inner{
  display:grid;
  grid-template-columns:2fr 1fr;
  gap:clamp(20px,3vw,40px);
  align-items:start;
  max-width:var(--maxw);
  margin-inline:auto;
}
.footer-brand a{font-weight:700;font-size:1.0625rem;color:var(--ink)}
.footer-brand p{max-width:34em;margin:.5em 0 0;font-size:.875rem;color:var(--muted)}
.footer-nav{display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:flex-end}
.footer-nav a{font-size:.875rem;color:var(--text)}
.footer-nav a:hover{color:var(--brand)}
.footer small{grid-column:1/-1;padding-top:18px;border-top:1px solid var(--line);font-size:.8125rem;color:#8b95a7}

/* ---------- 子页 ---------- */
.page-hero{
  padding:clamp(44px,6vw,80px) clamp(18px,4vw,40px) clamp(28px,4vw,44px);
  background:linear-gradient(180deg,var(--brand-soft),#fff);
  border-bottom:1px solid var(--line);
}
.page-hero .wrap{padding-inline:0}
.page-hero h1{font-size:clamp(1.75rem,3.4vw,2.5rem);margin-bottom:.4em}
.page-hero p{color:var(--muted);max-width:44em}
.crumbs{font-size:.8125rem;color:var(--muted);margin-bottom:1em}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--brand)}

.page{width:100%;max-width:var(--maxw);margin-inline:auto;padding:clamp(32px,5vw,64px) clamp(18px,4vw,40px)}
.page-narrow{max-width:820px}
.section-block + .section-block{margin-top:clamp(36px,5vw,64px)}
.section-block h2{font-size:clamp(1.35rem,2.2vw,1.75rem)}
.lede{font-size:1.0625rem;color:var(--muted)}
.card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(16px,2vw,24px)}
.card{
  padding:clamp(20px,2.4vw,30px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:#fff;
}
.card h3{margin-bottom:.4em}
.card p{font-size:.9375rem;color:var(--muted)}

.dl-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(16px,2vw,24px)}
.dl-card{display:flex;flex-direction:column;gap:.6em;padding:clamp(22px,2.6vw,32px);border:1px solid var(--line);border-radius:var(--radius);background:#fff}
.dl-card .dl-meta{font-size:.875rem;color:var(--muted);margin:0}
.dl-card .action{align-self:flex-start;margin-top:.4em}

.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius)}
table{width:100%;border-collapse:collapse;font-size:.9375rem;background:#fff}
th,td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--line)}
th{background:var(--bg-soft);font-weight:600;white-space:nowrap}
tbody tr:last-child td{border-bottom:0}

.faq-list{display:grid;gap:12px}
.faq-item{border:1px solid var(--line);border-radius:var(--radius);background:#fff;overflow:hidden}
.faq-item h3{margin:0}
.faq-item button{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1em;
  width:100%;
  padding:18px 22px;
  border:0;
  background:none;
  text-align:left;
  font-size:1rem;
  font-weight:600;
  color:var(--ink);
}
.faq-item button::after{content:"+";font-size:1.25rem;font-weight:400;color:var(--brand);line-height:1}
.faq-item button[aria-expanded="true"]::after{content:"−"}
.faq-item .faq-answer{padding:0 22px 18px;font-size:.9375rem;color:var(--muted)}
.faq-item .faq-answer[hidden]{display:none}

.steps{margin:0;padding:0;list-style:none;display:grid;gap:14px;counter-reset:step}
.steps li{
  position:relative;
  padding:16px 20px 16px 56px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  font-size:.9375rem;
  color:var(--muted);
  counter-increment:step;
}
.steps li::before{
  content:counter(step);
  position:absolute;
  left:18px;
  top:16px;
  width:24px;
  height:24px;
  display:grid;
  place-items:center;
  border-radius:50%;
  background:var(--brand-soft);
  color:var(--brand-dark);
  font-size:.8125rem;
  font-weight:700;
}

/* ---------- 资讯 / 文章 ---------- */
.dl-grid.is-single{grid-template-columns:minmax(0,560px)}
.article-meta{display:flex;flex-wrap:wrap;gap:.4em 1em;margin:0 0 1.8em;font-size:.8125rem;color:var(--muted)}
.article-body p,.article-body li{color:var(--muted)}
.article-body h2{margin-top:1.8em;font-size:clamp(1.15rem,2vw,1.4rem)}
.related{margin-top:clamp(32px,5vw,52px);padding-top:24px;border-top:1px solid var(--line)}
.related h2{font-size:1.15rem}
.related ul{margin:0;padding-left:1.15em}
.related li{font-size:.9375rem}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(16px,2vw,24px)}
.news-item{
  display:flex;
  flex-direction:column;
  gap:.5em;
  padding:clamp(20px,2.4vw,26px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:#fff;
  transition:border-color .18s ease,box-shadow .18s ease,transform .18s ease;
}
.news-item:hover{border-color:#c7d8f5;box-shadow:var(--shadow);transform:translateY(-2px)}
.news-item h3{font-size:1rem;margin:0}
.news-item h3 a{color:var(--ink)}
.news-item h3 a:hover{color:var(--brand)}
.news-item p{margin:0;font-size:.875rem;color:var(--muted)}
.news-item time{font-size:.75rem;color:#94a3b8}
.news-more{margin-top:2em}

/* ---------- 响应式 ---------- */
@media (max-width:1023px){
  .hero-inner{grid-template-columns:1fr 1fr;gap:32px}
  .feature-guide{grid-template-columns:repeat(2,1fr)}
  .news-grid{grid-template-columns:repeat(2,1fr)}
  .hero h1{font-size:clamp(1.75rem,3.6vw,2.35rem)}
}

@media (max-width:767px){
  .nav-shell{gap:12px;min-height:62px}
  .nav-menu{display:flex;margin-left:auto}
  .brand{margin-right:auto}
  .nav-download{display:none}
  .main-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    margin:0;
    padding:8px clamp(18px,4vw,40px) 16px;
    background:#fff;
    border-bottom:1px solid var(--line);
    box-shadow:0 16px 24px rgba(23,42,89,.08);
    display:none;
  }
  .main-nav.is-open{display:flex}
  .main-nav a{padding:.9em 0;border-bottom:1px solid var(--line)}
  .main-nav a:last-child{border-bottom:0}

  .hero-inner{grid-template-columns:1fr;padding-top:36px;text-align:left}
  .hero-photo{order:-1;max-width:520px;width:100%;margin-inline:auto}
  .download-actions .action{flex:1 1 100%;justify-content:center}
  .side-caption{display:none}

  .feature-guide{grid-template-columns:1fr}
  .news-grid{grid-template-columns:1fr}
  .proof-grid{grid-template-columns:repeat(2,1fr)}
  .card-grid,.dl-grid{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr}
  .footer-nav{justify-content:flex-start}
}

@media (max-width:375px){
  body{font-size:.9375rem}
  .action{width:100%;justify-content:center}
  .proof-item{padding:16px}
}