/* ===== 墨推 MoPush · 产品官网样式 ===== */
:root{
  --bg:#ffffff; --bg-alt:#f8fafc; --fg:#0f172a; --fg2:#64748b; --fg3:#94a3b8;
  --line:#e2e8f0; --accent:#4f46e5; --accent2:#7c3aed; --accent3:#2563eb;
  --card:#ffffff; --radius:16px;
  --shadow:0 1px 2px rgba(15,23,42,.04),0 6px 22px rgba(15,23,42,.06);
  --shadow-lg:0 10px 30px rgba(15,23,42,.08),0 30px 60px rgba(79,70,229,.10);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--fg);line-height:1.7;font-size:16px;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
}
a{color:var(--accent);text-decoration:none}
img{max-width:100%}
.only-mobile{display:none}

/* ---------- 顶栏 ---------- */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.82);
  backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid transparent;transition:.2s}
.nav.scrolled{border-bottom-color:var(--line);box-shadow:0 2px 14px rgba(15,23,42,.055)}
.nav-inner{max-width:1120px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;gap:22px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:17px;color:var(--fg);letter-spacing:-.2px}
.brand-mark{width:32px;height:32px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(140deg,var(--accent),var(--accent2));color:#fff;font-size:16px;
  box-shadow:0 4px 14px rgba(79,70,229,.32)}
.brand-mark.small{width:24px;height:24px;border-radius:8px;font-size:12px;box-shadow:none}
.brand-text em{font-style:normal;font-size:11.5px;font-weight:600;color:var(--fg3);margin-left:6px;letter-spacing:.5px}
.nav-links{display:flex;gap:4px;margin-left:8px}
.nav-links a{color:var(--fg2);font-size:14.5px;font-weight:500;padding:7px 12px;border-radius:9px}
.nav-links a:hover{color:var(--fg);background:rgba(15,23,42,.05)}
.nav-actions{margin-left:auto;display:flex;gap:9px;align-items:center}
.btn-ghost{color:var(--fg2);font-size:14.5px;font-weight:500;padding:8px 14px;border-radius:10px}
.btn-ghost:hover{color:var(--fg);background:rgba(15,23,42,.05)}
.btn-solid{background:var(--accent);color:#fff !important;font-size:14.5px;font-weight:600;
  padding:9px 18px;border-radius:10px;box-shadow:0 4px 14px rgba(79,70,229,.28)}
.btn-solid:hover{transform:translateY(-1px);box-shadow:0 8px 22px rgba(79,70,229,.36)}

/* ---------- 首屏 ---------- */
.hero{position:relative;overflow:hidden;padding:76px 0 64px;text-align:center;
  background:linear-gradient(170deg,#ffffff 0%,#f5f3ff 45%,#eef2ff 100%)}
.hero-glow{position:absolute;top:-220px;left:50%;transform:translateX(-50%);
  width:900px;height:520px;border-radius:50%;
  background:radial-gradient(closest-side,rgba(124,58,237,.20),transparent 72%);pointer-events:none}
.hero-inner{position:relative;max-width:820px;margin:0 auto;padding:0 24px;z-index:1}
.hero-badge{display:inline-flex;align-items:center;gap:7px;background:rgba(255,255,255,.9);
  border:1px solid var(--line);color:var(--accent);font-size:12.5px;font-weight:600;
  padding:6px 14px;border-radius:20px;margin-bottom:22px;box-shadow:var(--shadow)}
.hero-title{font-size:clamp(32px,5.6vw,56px);font-weight:860;line-height:1.16;
  letter-spacing:-1.8px;margin-bottom:22px}
.grad{background:linear-gradient(110deg,var(--accent),var(--accent2) 48%,var(--accent3));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero-sub{font-size:clamp(15px,2vw,17.5px);color:var(--fg2);max-width:660px;margin:0 auto 32px;line-height:1.85}
.hero-cta{display:flex;justify-content:center;gap:13px;flex-wrap:wrap;margin-bottom:30px}
.cta{display:inline-flex;align-items:center;gap:9px;font-size:15.5px;font-weight:650;
  padding:14px 30px;border-radius:14px;transition:.18s;text-decoration:none}
.cta.primary{background:linear-gradient(120deg,var(--accent),var(--accent2));color:#fff;
  box-shadow:0 10px 28px rgba(79,70,229,.32)}
.cta.primary:hover{transform:translateY(-2px);box-shadow:0 16px 38px rgba(79,70,229,.42);color:#fff}
.cta.ghost{background:rgba(255,255,255,.92);color:var(--fg);border:1px solid var(--line)}
.cta.ghost:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px)}
/* 流程图 */
.flow-visual{position:relative;max-width:940px;margin:56px auto 0;padding:0 24px;
  display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap;z-index:1}
.flow-card{flex:1 1 240px;max-width:290px;background:var(--card);border:1px solid var(--line);
  border-radius:14px;padding:16px 18px;text-align:left;box-shadow:var(--shadow)}
.fc-head{display:flex;align-items:center;gap:8px;font-size:13.5px;font-weight:700;margin-bottom:12px}
.fc-head i{color:var(--accent);font-size:16px}
.fc-body{display:grid;gap:7px}
.line{height:7px;border-radius:4px;background:linear-gradient(90deg,#e2e8f0,#eef2f7)}
.line.w90{width:90%}.line.w85{width:85%}.line.w80{width:80%}.line.w75{width:75%}
.line.w70{width:70%}.line.w60{width:60%}.line.w55{width:55%}
.flow-arrow{color:var(--fg3);font-size:20px;flex-shrink:0}

/* ---------- 通用区块 ---------- */
.sec{padding:78px 0}
.sec-alt{background:var(--bg-alt);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec > *{max-width:1120px;margin-left:auto;margin-right:auto;padding-left:24px;padding-right:24px}
.sec-head{text-align:center;margin-bottom:46px}
.sec-head h2{font-size:clamp(24px,3.4vw,34px);font-weight:830;letter-spacing:-1px;margin-bottom:12px}
.sec-head p{font-size:15.5px;color:var(--fg2)}

/* 功能卡 */
.feat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:20px}
.feat{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px 26px;
  transition:.2s;box-shadow:var(--shadow)}
.feat:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);
  border-color:color-mix(in srgb,var(--accent) 28%,var(--line))}
.feat-ico{width:48px;height:48px;border-radius:14px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(140deg,rgba(79,70,229,.13),rgba(124,58,237,.11));
  color:var(--accent);font-size:22px;margin-bottom:17px}
.feat h3{font-size:16.5px;font-weight:730;margin-bottom:10px;letter-spacing:-.2px}
.feat p{font-size:14.5px;line-height:1.78;color:var(--fg2)}

/* 步骤 */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:22px;position:relative}
.step{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 24px;box-shadow:var(--shadow);position:relative}
.step-no{width:38px;height:38px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(140deg,var(--accent),var(--accent2));color:#fff;font-weight:800;
  font-size:17px;margin-bottom:16px;box-shadow:0 6px 16px rgba(79,70,229,.28)}
.step h3{font-size:16px;font-weight:730;margin-bottom:8px}
.step p{font-size:14.3px;color:var(--fg2);line-height:1.75}
.steps-note{margin-top:28px;display:flex;gap:11px;align-items:flex-start;background:var(--card);
  border:1px solid var(--line);border-radius:14px;padding:16px 20px;font-size:14px;color:var(--fg2);
  box-shadow:var(--shadow)}
.steps-note i{color:var(--accent);font-size:17px;flex-shrink:0;margin-top:2px}
.steps-note strong{color:var(--fg)}

/* 技术 */
.tech-grid{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-bottom:36px}
.tech{display:inline-flex;align-items:center;gap:9px;background:var(--card);border:1px solid var(--line);
  border-radius:12px;padding:10px 18px;font-size:14.5px;font-weight:500;box-shadow:var(--shadow)}
.tech i{color:var(--accent);font-size:17px}
.arch{max-width:760px;display:grid;gap:12px}
.arch-row{display:flex;align-items:center;gap:14px;background:var(--card);border:1px solid var(--line);
  border-radius:13px;padding:14px 18px;box-shadow:var(--shadow)}
.arch-label{flex-shrink:0;font-size:12.5px;font-weight:700;color:var(--accent);
  background:rgba(79,70,229,.1);padding:3px 12px;border-radius:20px}
.arch-box{font-size:14.3px;color:var(--fg2)}

/* FAQ */
.faq{max-width:820px;display:grid;gap:12px}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:0 20px;box-shadow:var(--shadow);transition:.15s}
.faq details[open]{border-color:color-mix(in srgb,var(--accent) 25%,var(--line))}
.faq summary{cursor:pointer;font-size:15.3px;font-weight:650;padding:17px 0;list-style:none;
  display:flex;align-items:center;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--fg3);font-size:19px;font-weight:400;flex-shrink:0}
.faq details[open] summary::after{content:"−";color:var(--accent)}
.faq p{font-size:14.5px;color:var(--fg2);line-height:1.85;padding:0 0 18px}
.faq a{color:var(--accent);font-weight:500}

/* 底部 CTA */
.cta-band{text-align:center;padding:76px 24px;
  background:linear-gradient(125deg,var(--accent),var(--accent2) 55%,var(--accent3));color:#fff}
.cta-band h2{font-size:clamp(24px,3.4vw,34px);font-weight:830;letter-spacing:-1px;margin-bottom:12px}
.cta-band p{font-size:15.5px;color:rgba(255,255,255,.86);margin-bottom:30px}
.cta-band-actions{display:flex;justify-content:center;gap:13px;flex-wrap:wrap}
.cta.light{background:#fff;color:var(--accent) !important;box-shadow:0 10px 28px rgba(0,0,0,.18)}
.cta.light:hover{transform:translateY(-2px);box-shadow:0 16px 38px rgba(0,0,0,.24)}
.cta.outline{background:rgba(255,255,255,.14);color:#fff;border:1px solid rgba(255,255,255,.42)}
.cta.outline:hover{background:rgba(255,255,255,.24);transform:translateY(-2px)}

/* 页脚 */
.foot{border-top:1px solid var(--line);padding:34px 24px;background:var(--bg)}
.foot-inner{max-width:1120px;margin:0 auto;display:flex;align-items:center;gap:20px;flex-wrap:wrap;
  justify-content:space-between}
.foot-brand{display:flex;align-items:center;gap:9px;font-weight:700;font-size:15px}
.foot-links{display:flex;gap:18px;flex-wrap:wrap}
.foot-links a{color:var(--fg2);font-size:14px}
.foot-links a:hover{color:var(--accent)}
.foot-copy{font-size:13px;color:var(--fg3);width:100%;text-align:center;
  padding-top:18px;border-top:1px solid var(--line);margin-top:6px}

/* ---------- 响应式 ---------- */
@media(max-width:900px){
  .nav-links{display:none}
  .sec{padding:58px 0}
}
@media(max-width:640px){
  .only-mobile{display:block}
  .only-desktop{display:none}
  .nav-inner{padding:12px 16px;gap:12px}
  .brand{font-size:15.5px}
  .nav-actions .btn-ghost{padding:7px 10px;font-size:13.5px}
  .nav-actions .btn-solid{padding:8px 14px;font-size:13.5px}
  .hero{padding:52px 0 46px}
  .hero-title{letter-spacing:-1px}
  .cta{padding:12px 22px;font-size:14.5px;width:100%;justify-content:center}
  .hero-cta{gap:10px}
  .flow-visual{gap:10px;margin-top:38px}
  .flow-arrow{transform:rotate(90deg)}
  .flow-card{flex:1 1 100%;max-width:none}
  .sec > *{padding-left:16px;padding-right:16px}
  .feat,.step{padding:22px 20px}
  .arch-row{flex-direction:column;align-items:flex-start;gap:8px}
  .cta-band{padding:56px 18px}
  .foot-inner{flex-direction:column;align-items:flex-start;gap:14px}
}