:root{--bg:#f5f6f8;--card:#fff;--text:#111827;--muted:#6b7280;--line:#e5e7eb;--accent:#111827;--soft:#eef0f3}
*{box-sizing:border-box}html{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text)}
body{margin:0;background:var(--bg)}button,input,select,textarea{font:inherit}button{cursor:pointer}
.app-shell{max-width:860px;margin:auto;padding:18px 16px 98px}.topbar{display:flex;justify-content:space-between;gap:14px;align-items:flex-start;margin-bottom:16px}
h1{font-size:24px;margin:2px 0 4px}h2{font-size:19px;margin:2px 0 4px}h3{font-size:15px;margin:0 0 8px}.eyebrow{font-size:11px;letter-spacing:.1em;color:var(--muted);font-weight:800}
.muted{color:var(--muted);font-size:14px;line-height:1.55}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:16px;margin-bottom:12px}.hero{display:flex;justify-content:space-between;align-items:center;gap:15px}
.card-head,.dialog-head{display:flex;justify-content:space-between;gap:12px;align-items:flex-start}.primary,.ghost,.file-btn,.text-btn,.chip,.nav-btn,.icon-btn{border-radius:12px;min-height:44px;font-weight:700}
.primary{border:0;background:var(--accent);color:#fff;padding:11px 15px}.primary.small{min-height:38px;padding:8px 12px;font-size:13px}.ghost,.file-btn{border:1px solid var(--line);background:#fff;color:var(--text);padding:10px 14px}
.text-btn{border:0;background:transparent;color:var(--text);padding:6px 8px}.full{width:100%}.hidden{display:none!important}
label{display:block;font-size:13px;font-weight:700;margin-top:11px}input,select,textarea{width:100%;margin-top:6px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--text);padding:11px 12px;font-size:16px;outline:none}
textarea{resize:vertical}.view{display:none}.view.active{display:block}.filter-row{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}.chip{border:1px solid var(--line);background:#fff;padding:8px 11px;min-height:38px}.chip.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.exercise-list,.plan-list,.history-list,.session-exercise-list{display:grid;gap:9px}.exercise,.plan-item,.history-item,.session-exercise{border:1px solid var(--line);border-radius:14px;padding:12px;background:#fff}.row{display:flex;justify-content:space-between;gap:12px;align-items:flex-start}.title{font-weight:800;font-size:14px}.meta{color:var(--muted);font-size:13px;margin-top:4px;line-height:1.5}.tag{background:var(--soft);padding:5px 8px;border-radius:999px;font-size:11px;white-space:nowrap}
.action-row{display:flex;gap:9px;flex-wrap:wrap;align-items:center}.file-btn{display:inline-flex;align-items:center;margin-top:12px}.file-btn input{display:none}.notice{margin-top:12px;background:#f3f4f6;border-radius:12px;padding:11px;font-size:13px}
.mini-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:12px 0}.mini-stat{background:var(--soft);border-radius:12px;padding:10px}.mini-stat strong{display:block;font-size:20px;margin-top:3px}
.bottom-nav{position:fixed;left:50%;bottom:0;transform:translateX(-50%);width:min(860px,100%);display:grid;grid-template-columns:repeat(5,1fr);gap:6px;padding:9px 10px calc(9px + env(safe-area-inset-bottom));background:rgba(245,246,248,.95);border-top:1px solid var(--line);backdrop-filter:blur(12px)}
.nav-btn{border:1px solid var(--line);background:#fff;color:var(--text);padding:9px 4px;font-size:13px}.nav-btn.active{background:var(--accent);color:white;border-color:var(--accent)}
dialog{border:0;padding:0;background:transparent;width:min(620px,calc(100% - 24px));max-height:86%;}dialog::backdrop{background:rgba(17,24,39,.45)}.dialog-card{background:#fff;border-radius:20px;padding:18px;max-height:82vh;overflow:auto}
.icon-btn{border:1px solid var(--line);background:#fff;width:42px;font-size:22px}.detail-section{border-top:1px solid var(--line);padding-top:14px;margin-top:14px}.detail-section ol,.detail-section ul{padding-left:22px;color:#374151;line-height:1.7;font-size:14px}
.session-exercise{background:#fafafa}.session-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px}.remove-btn{border:0;background:transparent;color:#6b7280;font-weight:700}
@media(max-width:620px){.hero{align-items:flex-start;flex-direction:column}.hero .primary{width:100%}.bottom-nav{grid-template-columns:repeat(5,1fr)}.nav-btn{font-size:12px}.session-grid{grid-template-columns:1fr 1fr}.mini-stats{grid-template-columns:1fr 1fr 1fr}}