/* =========================================================================
 * 全站共享设计系统 · 亮色简洁风
 * 被 index.html / library.html / originkit.html / tools.html 复用
 * ========================================================================= */
:root{
  --s-bg:#f5f6fb; --s-bg2:#ffffff; --s-bg3:#eef0f7;
  --s-ink:#1b2030; --s-ink2:#565d72; --s-ink3:#939ab0;
  --s-line:#e6e8f1; --s-line2:#eef0f6;
  --s-ac:#7c3aed; --s-ac2:#4f6ef7; --s-ac3:#22d3ee; --s-pink:#f472b6;
  --s-r:12px; --s-r-sm:9px; --s-r-lg:18px;
  --s-sh:0 1px 2px rgba(20,26,48,.05),0 8px 24px rgba(20,26,48,.07);
  --s-sh-lg:0 16px 44px rgba(20,26,48,.14);
  --s-f:14px;
  --s-mx:1180px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:"Inter","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  font-size:var(--s-f);color:var(--s-ink);background:var(--s-bg);line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--s-ac);text-decoration:none}
.s-container{max-width:var(--s-mx);margin:0 auto;padding:0 22px}

/* ---------- 顶部共享导航 ---------- */
.sit-nav{
  position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:18px;
  padding:11px 22px;background:rgba(255,255,255,.88);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--s-line);
}
.sit-brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:15px;color:var(--s-ink);white-space:nowrap}
.sit-brand .logo{
  width:32px;height:32px;border-radius:9px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--s-ac),var(--s-ac3));color:#fff;font-size:16px;flex:none;
  box-shadow:0 4px 12px rgba(124,58,237,.32);
}
.sit-brand small{display:block;font-weight:400;font-size:10.5px;color:var(--s-ink3);margin-top:-1px}
.sit-links{display:flex;align-items:center;gap:4px;flex:1;flex-wrap:wrap}
.sit-links a{
  color:var(--s-ink2);font-size:13.5px;padding:7px 13px;border-radius:9px;
  transition:background .15s,color .15s;white-space:nowrap;
}
.sit-links a:hover{background:var(--s-bg3);color:var(--s-ink)}
.sit-links a.active{background:linear-gradient(135deg,var(--s-ac),var(--s-ac2));color:#fff;font-weight:600;box-shadow:0 4px 14px rgba(124,58,237,.28)}
.sit-meta{font-size:12px;color:var(--s-ink3);white-space:nowrap}
@media(max-width:720px){.sit-meta{display:none}.sit-brand small{display:none}}

/* ---------- 英雄区 / 门户首页 ---------- */
.s-hero{padding:64px 0 30px;text-align:center}
.s-hero .eyebrow{
  display:inline-flex;align-items:center;gap:7px;font-size:12px;font-weight:600;color:var(--s-ac);
  background:rgba(124,58,237,.09);border:1px solid rgba(124,58,237,.22);
  border-radius:999px;padding:5px 13px;margin-bottom:18px;
}
.s-hero h1{
  font-size:44px;line-height:1.18;margin:0 0 14px;font-weight:900;letter-spacing:-.01em;
  background:linear-gradient(100deg,var(--s-ink) 30%,var(--s-ac) 75%,var(--s-ac3));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.s-hero p{font-size:16px;color:var(--s-ink2);max-width:640px;margin:0 auto 26px}
.s-hero .cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* ---------- 统计条 ---------- */
.s-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:10px 0 38px}
.s-stat{background:var(--s-bg2);border:1px solid var(--s-line);border-radius:var(--s-r-lg);padding:20px;text-align:center;box-shadow:var(--s-sh)}
.s-stat b{display:block;font-size:30px;font-weight:900;color:var(--s-ac);line-height:1.05;font-variant-numeric:tabular-nums}
.s-stat span{font-size:12.5px;color:var(--s-ink3)}
@media(max-width:680px){.s-stats{grid-template-columns:repeat(2,1fr)}}

/* ---------- 门户板块卡片 ---------- */
.s-pgrid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-bottom:40px}
@media(max-width:760px){.s-pgrid{grid-template-columns:1fr}}
.s-pcard{
  position:relative;display:flex;flex-direction:column;gap:11px;background:var(--s-bg2);
  border:1px solid var(--s-line);border-radius:var(--s-r-lg);padding:24px;
  transition:transform .18s,box-shadow .2s,border-color .2s;overflow:hidden;
}
.s-pcard::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;
  background:linear-gradient(90deg,var(--s-ac),var(--s-ac3));opacity:.0;transition:opacity .2s}
.s-pcard:hover{transform:translateY(-3px);box-shadow:var(--s-sh-lg);border-color:rgba(124,58,237,.4)}
.s-pcard:hover::before{opacity:1}
.s-pcard .ic{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;font-size:22px;
  background:linear-gradient(135deg,rgba(124,58,237,.14),rgba(34,211,238,.12));border:1px solid rgba(124,58,237,.22)}
.s-pcard h3{margin:0;font-size:18px;font-weight:800}
.s-pcard p{margin:0;font-size:13.5px;color:var(--s-ink2);line-height:1.65}
.s-pcard .meta{display:flex;gap:7px;flex-wrap:wrap;margin-top:2px}
.s-pcard .meta span{font-size:11.5px;color:var(--s-ac);background:rgba(124,58,237,.09);border:1px solid rgba(124,58,237,.18);padding:2px 9px;border-radius:999px}
.s-pcard .go{margin-top:auto;font-size:13.5px;font-weight:600;color:var(--s-ac);display:inline-flex;align-items:center;gap:6px}
.s-pcard .go .ar{transition:transform .18s}
.s-pcard:hover .go .ar{transform:translateX(4px)}

/* ---------- 通用按钮 / 标签 ---------- */
.s-btn{display:inline-flex;align-items:center;gap:8px;border-radius:11px;padding:11px 20px;font-size:14px;font-weight:600;cursor:pointer;border:1px solid transparent;transition:.18s;font-family:inherit}
.s-btn.primary{background:linear-gradient(135deg,var(--s-ac),var(--s-ac2));color:#fff;box-shadow:0 6px 18px rgba(124,58,237,.3)}
.s-btn.primary:hover{filter:brightness(1.06);transform:translateY(-1px)}
.s-btn.ghost{background:var(--s-bg2);border-color:var(--s-line);color:var(--s-ink)}
.s-btn.ghost:hover{border-color:var(--s-ac);color:var(--s-ac)}

.s-tag{display:inline-block;font-size:11.5px;color:var(--s-ink2);background:var(--s-bg3);border:1px solid var(--s-line);padding:3px 10px;border-radius:999px}

/* ---------- 区块标题 ---------- */
.s-sec-h{font-size:13px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--s-ink3);margin:34px 0 16px;display:flex;align-items:center;gap:10px}
.s-sec-h::after{content:"";flex:1;height:1px;background:var(--s-line)}

/* ---------- 页脚 ---------- */
.sit-foot{margin-top:54px;border-top:1px solid var(--s-line);background:var(--s-bg2)}
.sit-foot .in{max-width:var(--s-mx);margin:0 auto;padding:26px 22px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;color:var(--s-ink3);font-size:12.5px}
.sit-foot a{color:var(--s-ink2)}
.sit-foot a:hover{color:var(--s-ac)}
.sit-foot .links{display:flex;gap:16px;flex-wrap:wrap}

/* ---------- 通用内容容器（子页面用） ---------- */
.s-page{max-width:var(--s-mx);margin:0 auto;padding:26px 22px 0}
.s-page .lead{color:var(--s-ink2);font-size:14.5px;max-width:720px;margin:0 0 6px}
.s-callout{background:var(--s-bg2);border:1px solid var(--s-line);border-radius:var(--s-r-lg);padding:14px 18px;margin:16px 0 22px;font-size:13.5px;color:var(--s-ink2);line-height:1.7}
.s-callout b{color:var(--s-ink)}

@media(max-width:560px){.s-hero{padding:42px 0 18px}.s-hero h1{font-size:31px}}

/* ---------- 组件库子栏（模式切换 + 计数） ---------- */
.lib-subbar{
  position:sticky;top:56px;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:10px 22px;background:rgba(255,255,255,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--s-line);
}
@media(max-width:680px){.lib-subbar{flex-wrap:wrap}.stat{display:none}}