/* 关于本站：开发历程时间线
   依赖 nav.css 的变量与 .sb-hero / .tl-chips 视觉体系 */
.app.page-about{grid-template-columns:minmax(0,1fr)}
.app.page-about .rail{display:none}

.ab-wrap{display:flex;flex-direction:column;gap:16px;min-width:0}

/* Hero */
.ab-hero{padding-bottom:30px}
.ab-hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:minmax(0,1fr) 172px;gap:20px;align-items:center}
.ab-prog{margin-top:20px;max-width:520px}
.ab-prog-bar{height:8px;border-radius:999px;background:rgba(255,255,255,.22);overflow:hidden}
.ab-prog-bar i{display:block;width:100%;height:100%;border-radius:999px;
  background:linear-gradient(90deg,#fff,#e9d5ff);animation:ab-fill 1.4s cubic-bezier(.22,.61,.36,1) both}
@keyframes ab-fill{from{width:0}}
.ab-prog-meta{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-top:8px;
  font-size:11px;color:rgba(255,255,255,.72)}
.ab-prog-meta b{color:#fff;font-weight:700;letter-spacing:.2px}

.ab-seal{position:relative;width:158px;height:158px;border-radius:50%;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:2px;margin-left:auto;
  background:radial-gradient(circle at 50% 32%,rgba(255,255,255,.24),rgba(255,255,255,.05) 68%);
  border:1px dashed rgba(255,255,255,.42)}
.ab-seal b{font-size:44px;font-weight:800;line-height:1;letter-spacing:-2px;color:#fff;
  text-shadow:0 8px 30px rgba(255,255,255,.35)}
.ab-seal em{font-style:normal;font-size:10.5px;letter-spacing:1.2px;color:rgba(255,255,255,.78)}
.ab-ring{position:absolute;border-radius:50%;border:1px solid rgba(255,255,255,.18)}
.ab-ring.r1{inset:-12px;border-style:dotted;animation:ab-spin 26s linear infinite}
.ab-ring.r2{inset:16px;border-color:rgba(255,255,255,.14)}
@keyframes ab-spin{to{transform:rotate(360deg)}}

/* 关键数字 */
.ab-stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.ab-stat{position:relative;overflow:hidden;padding:15px 17px;border-radius:16px;
  background:var(--panel);border:1px solid var(--card-border);box-shadow:var(--shadow-sm)}
.ab-stat::after{content:"";position:absolute;right:-22px;top:-22px;width:64px;height:64px;
  border-radius:50%;background:var(--glow-1)}
.ab-stat b{position:relative;display:flex;align-items:baseline;gap:3px;font-size:26px;font-weight:800;
  letter-spacing:-.6px;color:var(--text);line-height:1.1}
.ab-stat b em{font-style:normal;font-size:12px;font-weight:600;color:var(--muted)}
.ab-stat span{position:relative;display:block;margin-top:3px;font-size:12px;color:var(--text-2)}

/* 筛选条 */
.ab-bar{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:14px;
  background:var(--panel);border:1px solid var(--card-border);box-shadow:var(--shadow-sm)}
.ab-bar .tl-chips{flex:1 1 auto;min-width:0}

/* 主体两栏 */
.ab-body{display:grid;grid-template-columns:minmax(0,1fr) 272px;gap:16px;align-items:start}
.ab-groups{display:flex;flex-direction:column;gap:16px;min-width:0}

/* 阶段 */
.ab-group{padding:18px 18px 8px;border-radius:18px;background:var(--panel);
  border:1px solid var(--card-border);box-shadow:var(--shadow-sm)}
.ab-group[hidden]{display:none}
.ab-ghead{display:flex;align-items:center;gap:11px;padding-bottom:14px;border-bottom:1px dashed var(--border)}
.ab-gico{flex:none;width:40px;height:40px;border-radius:13px;display:grid;place-items:center;
  font-size:17px;color:#fff;background:var(--grad);box-shadow:0 8px 20px var(--glow-1)}
.ab-gtx{flex:1 1 auto;min-width:0}
.ab-gtx b{display:block;font-size:15px;font-weight:800;color:var(--text)}
.ab-gtx em{display:block;margin-top:2px;font-style:normal;font-size:11.5px;color:var(--muted);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ab-gnum{flex:none;height:26px;padding:0 11px;border-radius:999px;display:inline-flex;align-items:center;
  font-size:11px;font-weight:700;color:var(--accent);background:var(--primary-light)}

/* 天级时间线 */
.ab-days{position:relative;padding:16px 0 8px 24px}
.ab-days::before{content:"";position:absolute;left:7px;top:24px;bottom:20px;width:2px;border-radius:2px;
  background:linear-gradient(180deg,var(--accent),var(--accent-2) 60%,transparent)}
.ab-day{position:relative;padding-bottom:12px}
.ab-day:last-child{padding-bottom:0}
.ab-day::before{content:"";position:absolute;left:-22px;top:20px;width:9px;height:9px;border-radius:50%;
  background:var(--panel);border:2px solid var(--accent);box-shadow:0 0 0 4px var(--glow-1)}
.ab-card{padding:13px 15px;border-radius:13px;background:var(--surface-2);border:1px solid transparent;
  transition:background .22s,border-color .22s,box-shadow .22s,transform .22s}
.ab-day:hover .ab-card{background:var(--panel);border-color:var(--card-border);
  box-shadow:var(--shadow-sm);transform:translateX(2px)}

.ab-ch{display:flex;align-items:center;gap:9px;flex-wrap:wrap}
.ab-ch-no{flex:none;height:21px;padding:0 8px;border-radius:7px;display:inline-flex;align-items:center;
  font-size:10.5px;font-weight:800;letter-spacing:.4px;color:#fff;background:var(--grad)}
.ab-ch h3{margin:0;font-size:13.5px;font-weight:700;color:var(--text)}
.ab-desc{margin:6px 0 0;font-size:12.5px;line-height:1.75;color:var(--text-2)}
.ab-items{list-style:none;margin:9px 0 0;padding:0;display:flex;flex-direction:column;gap:5px}
.ab-items li{position:relative;padding-left:15px;font-size:12px;line-height:1.7;color:var(--text-2)}
.ab-items li::before{content:"";position:absolute;left:2px;top:8px;width:5px;height:5px;border-radius:50%;
  background:var(--accent-2);opacity:.55}
.ab-tags{display:flex;flex-wrap:wrap;gap:5px;margin-top:9px}
.ab-tags span{height:20px;padding:0 7px;border-radius:6px;display:inline-flex;align-items:center;
  font-size:10.5px;color:var(--text-2);background:var(--panel);border:1px solid var(--border)}

/* 右侧信息 */
.ab-side{position:sticky;top:calc(var(--top) + 16px);display:flex;flex-direction:column;gap:12px}
.ab-box{padding:14px;border-radius:16px;background:var(--panel);
  border:1px solid var(--card-border);box-shadow:var(--shadow-sm)}
.ab-box h4{margin:0 0 11px;font-size:12.5px;font-weight:800;color:var(--text);
  display:flex;align-items:center;gap:6px}
.ab-box h4 i{color:var(--accent)}
.ab-stack{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:9px}
.ab-stack li{display:flex;align-items:center;gap:9px}
.ab-si{flex:none;width:29px;height:29px;border-radius:9px;display:grid;place-items:center;
  font-size:13px;color:var(--accent);background:var(--primary-light)}
.ab-stack b{display:block;font-size:11.5px;font-weight:700;color:var(--text)}
.ab-stack em{display:block;font-style:normal;font-size:10.5px;color:var(--muted);margin-top:1px}

.ab-ways{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}
.ab-ways li{display:flex;align-items:flex-start;gap:8px}
.ab-ways li>i{flex:none;margin-top:1px;font-size:13px;color:var(--accent)}
.ab-ways b{display:block;font-size:11.5px;font-weight:700;color:var(--text)}
.ab-ways em{display:block;margin-top:1px;font-style:normal;font-size:10.5px;line-height:1.6;color:var(--muted)}

.ab-quote{position:relative;overflow:hidden;padding:18px;border-radius:16px;
  background:var(--grad);color:#fff;box-shadow:0 14px 34px -18px rgba(99,102,241,.6)}
.ab-quote::after{content:"";position:absolute;right:-26px;bottom:-26px;width:96px;height:96px;
  border-radius:50%;background:rgba(255,255,255,.14)}
.ab-quote i{position:relative;font-size:20px;color:rgba(255,255,255,.7)}
.ab-quote p{position:relative;margin:6px 0 0;font-size:12px;line-height:1.9;color:rgba(255,255,255,.92)}

/* 收尾 */
.ab-end{display:flex;flex-direction:column;align-items:center;gap:4px;padding:22px;border-radius:18px;
  background:var(--panel);border:1px dashed var(--border);text-align:center}
.ab-end i{font-size:19px;color:var(--accent)}
.ab-end b{font-size:13px;font-weight:700;color:var(--text)}
.ab-end span{font-size:11.5px;color:var(--muted)}

@media(max-width:1100px){
  .ab-body{grid-template-columns:minmax(0,1fr)}
  .ab-side{position:static;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:start}
  .ab-quote{grid-column:1/-1}
}
@media(max-width:760px){
  .ab-hero-grid{grid-template-columns:minmax(0,1fr)}
  .ab-seal{display:none}
  .ab-stats{grid-template-columns:repeat(2,minmax(0,1fr))}
  .ab-bar{flex-direction:column;align-items:flex-start;gap:8px}
  .ab-bar .tl-chips{width:100%}
  .ab-side{grid-template-columns:minmax(0,1fr)}
  .ab-group{padding:14px 12px 4px;border-radius:16px}
  .ab-days{padding-left:20px}
  .ab-day::before{left:-18px}
  .ab-card{padding:12px 13px}
  .ab-gtx em{white-space:normal}
}