:root{--bg:#f6f4ef;--card:#fff;--line:#e3dfd6;--tx:#1d2b2a;--mut:#6a7776;--ac:#0f766e;--ac2:#d7efec;--r:12px}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--tx);font:16px/1.5 Georgia,"Times New Roman",serif}
.bar{background:var(--card);border-bottom:1px solid var(--line)}
.bar-in,main{max-width:640px;margin:0 auto;padding-left:16px;padding-right:16px}
.bar-in{display:flex;align-items:center;justify-content:space-between;min-height:56px}
.brand{display:flex;align-items:center;gap:10px;font-family:system-ui,-apple-system,"Segoe UI",Arial,sans-serif;font-weight:700}
.brand-mark{width:22px;height:22px;border-radius:6px;background:var(--ac)}
.bar-link{font-family:system-ui,Arial,sans-serif;font-size:14px;color:var(--mut)}
main{padding-top:22px;padding-bottom:40px}
.h1{margin:0 0 16px;font-size:32px;line-height:1.1;font-weight:700}
.app-error{background:#fde8e8;color:#8a1c1c;padding:12px 14px;border-radius:var(--r);font-family:system-ui,sans-serif}
:focus-visible{outline:3px solid var(--ac);outline-offset:2px}
button,input,select,.btn{font-family:system-ui,-apple-system,"Segoe UI",Arial,sans-serif}

/* segmented control */
.levels{display:grid;grid-template-columns:repeat(3,1fr);background:#e9e5dc;border-radius:14px;padding:4px;gap:4px;position:sticky;top:8px;z-index:5}
.lvl-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;min-height:56px;background:transparent;border:0;border-radius:11px;color:var(--mut);font-size:16px;font-weight:600;cursor:pointer}
.lvl-num{display:none}
.lvl-dots{display:inline-flex;gap:4px}
.lvl-dots i{width:6px;height:6px;border-radius:50%;background:#c9c4b8}
.lvl-dots i.on{background:currentColor}
.lvl-btn[aria-pressed=true]{background:var(--card);color:var(--ac);box-shadow:0 1px 3px rgba(0,0,0,.12)}

/* plan as a clean table-like list */
.plans{margin-top:24px}
.plan-head{margin-bottom:10px;display:flex;flex-direction:column;gap:2px}
.plan-level{order:-1;font-family:system-ui,sans-serif;font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--ac)}
.plan-title{margin:0;font-size:26px;line-height:1.15}
.exercises{list-style:none;margin:0;padding:0;background:var(--card);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.ex{display:grid;grid-template-columns:28px 1fr;gap:10px;padding:14px 16px;border-bottom:1px solid var(--line)}
.ex:last-child{border-bottom:0}
.ex-idx{font-family:system-ui,sans-serif;color:var(--ac);font-weight:700;padding-top:2px}
.ex-name{margin:0 0 6px;font-size:18px;font-weight:700;line-height:1.25}
.ex-meta{display:flex;flex-wrap:wrap;gap:6px 8px;margin:0;font-family:system-ui,sans-serif}
.ex-stat{display:inline-flex;gap:6px;align-items:baseline;background:var(--ac2);border-radius:99px;padding:3px 12px}
.ex-stat dt{font-size:12px;color:var(--mut)}
.ex-stat dd{margin:0;font-weight:700;font-size:15px;color:var(--ac)}
.empty{color:var(--mut)}

/* admin */
.adm-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}
.adm-head .h1{margin:0}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 18px;border-radius:10px;border:1px solid transparent;font-weight:600;font-size:15px;cursor:pointer;text-decoration:none}
.btn-primary{background:var(--ac);color:#fff}
.btn-ghost{background:var(--card);color:var(--tx);border-color:var(--line)}
.adm-group{margin-bottom:18px}
.adm-group-title{display:flex;align-items:center;gap:10px;margin:0 0 6px;font-family:system-ui,sans-serif;font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--ac)}
.adm-group-title .lvl-dots i{width:6px;height:6px;background:#c9c4b8}
.adm-group-title .lvl-dots i.on{background:var(--ac)}
.adm-row{display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:12px 16px;margin-bottom:8px}
.adm-info{display:grid}
.adm-title{font-size:17px}
.adm-count{font-family:system-ui,sans-serif;color:var(--mut);font-size:14px}
.editor{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px;margin-bottom:22px}
.editor-title{margin:0 0 14px;font-size:24px}
.field{display:grid;gap:6px;margin-bottom:14px}
.field label,.ed-cols{font-family:system-ui,sans-serif;font-size:13px;color:var(--mut)}
input,select{width:100%;min-height:44px;background:#fff;color:var(--tx);border:1px solid #cfc9bc;border-radius:10px;padding:0 12px;font-size:16px}
.ed-sub{margin:18px 0 8px;font-size:18px}
.ed-cols{display:none}
.ed-ex{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr) minmax(0,1fr) 44px;gap:8px;border-top:1px solid var(--line);padding:10px 0}
.ed-ex .ed-f:first-child{grid-column:1/-1}
.btn-x{min-width:44px;padding:0;font-size:22px}
.form-error{color:#8a1c1c;margin:12px 0 0;font-family:system-ui,sans-serif}
.ed-actions{display:flex;gap:10px;margin-top:16px}
.toast{position:fixed;left:16px;right:16px;bottom:16px;max-width:608px;margin:0 auto;background:var(--tx);color:#fff;font-family:system-ui,sans-serif;padding:14px 16px;border-radius:12px}
@media(min-width:640px){.ed-ex{grid-template-columns:minmax(0,2fr) minmax(0,1fr) minmax(0,1fr) minmax(0,1fr) 44px}.ed-ex .ed-f:first-child{grid-column:auto}.ed-cap{display:none}.ed-cols{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr) minmax(0,1fr) minmax(0,1fr) 44px;gap:8px;padding:0 0 4px}}
input,select{min-width:0}
.adm-info{min-width:0}.adm-row .btn{flex-shrink:0;padding:0 12px}.adm-title{overflow-wrap:anywhere}
.ed-f{display:block;min-width:0}.ed-cap{display:block;font-size:11px;margin-bottom:2px;color:#888}
@media(min-width:640px){.ed-cap{display:none}}