/* ============================================================
   sudu-youhua.css · 页面加载速度优化
   Hero 骨架：H15 环形刻度（左文 + 右侧环形仪表盘）
   ============================================================ */

/* ---------- Hero H15 环形刻度 ---------- */
.sd-hero{padding:60px 0 90px;background:var(--bg);overflow:hidden}
.sd-hero-x{top:50%;left:0;right:0;opacity:.25}
.sd-hero-in{display:grid;grid-template-columns:1.2fr 1fr;gap:40px;align-items:center}
.sd-hero-text h1{font-size:clamp(28px,4vw,46px);font-weight:800;margin:14px 0 18px}
.sd-hero-text h1 em{font-style:normal;color:var(--blue-ink)}
.sd-hero-text p{color:var(--muted);font-size:16px;margin-bottom:24px;max-width:540px}
.sd-hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.sd-hero-gauge{display:flex;justify-content:center}
.sd-ring{
  width:220px;height:220px;border-radius:50%;
  background:conic-gradient(var(--green-deep) 0 75%,var(--line) 75% 100%);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  position:relative;
}
.sd-ring::before{
  content:"";position:absolute;inset:18px;border-radius:50%;background:var(--white);
}
.sd-ring-num,.sd-ring-label{position:relative;z-index:2}
.sd-ring-num{font-size:48px;font-weight:800;color:var(--green-deep)}
.sd-ring-num span{font-size:20px;font-weight:700;margin-left:4px}
.sd-ring-label{font-size:14px;color:var(--muted);margin-top:4px}

/* ---------- 三个数据卡（section 2） ---------- */
.sd-why{background:var(--white);overflow:hidden}
.sd-why-v{left:30px;top:60px;bottom:60px;opacity:.2}
.sd-why-grid{margin-left:50px;display:grid;grid-template-columns:repeat(3,1fr);gap:22px;max-width:860px}
.sd-why-card{
  background:var(--bg);border:2px solid var(--line);border-radius:var(--r-lg);
  padding:30px 26px;text-align:center;
}
.sd-why-card b{display:block;font-size:42px;font-weight:800;color:var(--blue-ink);margin-bottom:10px}
.sd-why-card p{color:var(--muted);font-size:15px}

/* ---------- 编号横条（section 3） ---------- */
.sd-do{background:var(--bg);overflow:hidden}
.sd-do-x{top:50%;left:0;right:0;opacity:.25}
.sd-do-list{display:flex;flex-direction:column;gap:14px;max-width:820px;margin:0 auto;position:relative;z-index:2}
.sd-do-item{
  display:flex;gap:18px;align-items:flex-start;
  background:var(--white);border:2px solid var(--line);border-radius:var(--r-md);
  padding:18px 22px;
}
.sd-do-no{
  flex:none;width:48px;height:48px;border-radius:12px;
  background:var(--blue);color:#fff;font-weight:800;font-size:18px;
  display:flex;align-items:center;justify-content:center;
}
.sd-do-item h3{margin-bottom:5px;font-size:17px}
.sd-do-item p{color:var(--muted);font-size:14.5px}

/* ---------- 对比条形图（section 4） ---------- */
.sd-compare{background:var(--white)}
.sd-compare-bars{max-width:720px;margin:0 auto;display:flex;flex-direction:column;gap:18px}
.sd-bar-row{display:grid;grid-template-columns:80px 1fr 80px;gap:16px;align-items:center}
.sd-bar-label{font-weight:700;color:var(--muted)}
.sd-bar-track{height:28px;background:var(--bg);border-radius:999px;overflow:hidden}
.sd-bar-before{display:block;height:100%;background:#e07a6a;border-radius:999px}
.sd-bar-after{display:block;height:100%;background:var(--green-deep);border-radius:999px}
.sd-bar-85{width:85%}
.sd-bar-28{width:28%}
.sd-bar-row b{font-weight:800;color:var(--ink)}
.sd-compare-note{text-align:center;margin-top:22px;color:var(--muted);font-size:14.5px}

/* ---------- 左文右图（section 5） ---------- */
.sd-tool{background:var(--bg)}
.sd-tool-in{display:grid;grid-template-columns:1.1fr 1fr;gap:48px;align-items:center}
.sd-tool-text h2{font-size:clamp(24px,3vw,32px);margin-bottom:14px}
.sd-tool-text>p{color:var(--muted);margin-bottom:18px}
.sd-tool-media img{width:100%}

/* ---------- 案例卡（section 6） ---------- */
.sd-case{background:var(--white)}
.sd-case-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;max-width:860px;margin:0 auto}
.sd-case-card{
  display:block;border-radius:var(--r-lg);overflow:hidden;
  border:2px solid var(--line);transition:transform .3s,box-shadow .3s;
}
.sd-case-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.sd-case-card img{width:100%;height:220px;object-fit:cover}
.sd-case-cap{display:block;padding:16px 18px;background:var(--bg)}
.sd-case-cap b{display:block;font-size:16px}
.sd-case-cap i{font-style:normal;color:var(--muted);font-size:13.5px}
.sd-case-more{text-align:center;margin-top:30px;font-weight:700}

/* ---------- FAQ（section 7） ---------- */
.sd-faq{background:var(--bg)}
.sd-faq-list{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.sd-faq-item{
  background:var(--white);border:2px solid var(--line);border-radius:var(--r-md);
  padding:16px 22px;border-right:5px solid var(--green-deep);
}
.sd-faq-item summary{font-weight:800;cursor:pointer;list-style:none;position:relative;padding-right:26px}
.sd-faq-item summary::-webkit-details-marker{display:none}
.sd-faq-item summary::after{content:"+";position:absolute;right:0;top:0;font-size:20px;color:var(--green-deep)}
.sd-faq-item[open] summary::after{content:"−"}
.sd-faq-item p{margin-top:10px;color:var(--muted);font-size:14.5px}

/* ---------- 避坑提醒（section 7.5） ---------- */
.sd-keep{background:var(--bg);overflow:hidden}
.sd-keep-x{top:50%;left:0;right:0;opacity:.25}
.sd-keep-in{
  position:relative;z-index:2;
  display:grid;grid-template-columns:1.1fr 1fr;gap:40px;align-items:center;
  max-width:1000px;margin:0 auto;
}
.sd-keep-text p{color:var(--muted);font-size:15px;line-height:1.8;margin-bottom:14px}
.sd-keep-text b{color:var(--ink)}
.sd-keep-media img{width:100%}

/* ---------- CTA（section 8） ---------- */
.sd-cta{background:var(--white);padding-bottom:80px}
.sd-cta-band{
  background:linear-gradient(120deg,var(--green) 0%,var(--blue) 100%);
  border-radius:var(--r-lg);padding:60px 40px;text-align:center;
  box-shadow:var(--shadow);
}
.sd-cta-band h2{font-size:clamp(24px,3vw,34px);margin-bottom:14px;color:var(--ink)}
.sd-cta-band p{color:var(--ink);opacity:.8;max-width:560px;margin:0 auto 26px}
.sd-cta-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:20px}
.sd-cta-contact{font-size:14px;font-weight:700;letter-spacing:.04em;color:var(--ink)}

/* ---------- 响应式 ---------- */
@media (max-width:900px){
  .sd-hero-in{grid-template-columns:1fr}
  .sd-why-grid{grid-template-columns:1fr;margin-left:0}
  .sd-why-v{display:none}
  .sd-tool-in{grid-template-columns:1fr}
  .sd-keep-in{grid-template-columns:1fr}
  .sd-case-grid{grid-template-columns:1fr}
  .sd-bar-row{grid-template-columns:60px 1fr 70px}
}