:root{--navy:#0f2447;--navy2:#1c3a6e;--blue:#2563eb;--bg:#f4f6fb;--card:#fff;--ink:#16213a;--mut:#5b6785;--line:#dde3f0;--ok:#16794a;--bad:#b3261e;--warn:#8a5a00}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--blue)}
.top{background:var(--navy);color:#fff;display:flex;flex-wrap:wrap;gap:.5rem 1rem;align-items:center;justify-content:space-between;padding:.7rem 1rem;position:sticky;top:0;z-index:5}
.brand{color:#fff;font-weight:800;font-size:1.25rem;text-decoration:none}
nav{display:flex;flex-wrap:wrap;gap:.25rem}
nav a,nav button{color:#fff;background:transparent;border:0;font:inherit;padding:.4rem .7rem;border-radius:8px;cursor:pointer;text-decoration:none}
nav a:hover,nav button:hover,nav a.on{background:var(--navy2)}
main{max-width:1000px;margin:0 auto;padding:1rem}
.pad{padding:2rem 0}.muted{color:var(--mut)}.small{font-size:.85rem}
h1{font-size:1.6rem;margin:.2rem 0 .6rem}h2{font-size:1.25rem;margin:1.2rem 0 .5rem}h3{font-size:1.05rem;margin:.8rem 0 .3rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:1rem;margin:.7rem 0}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:.8rem}
.grid .card{margin:0;display:flex;flex-direction:column;gap:.35rem}
.tag{display:inline-block;background:#e8eefc;color:var(--navy2);border-radius:99px;padding:.1rem .6rem;font-size:.8rem;margin-right:.3rem}
.tag.draft{background:#fff3d6;color:var(--warn)}.tag.live{background:#dff5e8;color:var(--ok)}
.btn{display:inline-block;background:var(--blue);color:#fff;border:0;border-radius:9px;padding:.55rem 1rem;font:inherit;font-weight:600;cursor:pointer;text-decoration:none}
.btn.sec{background:#e8eefc;color:var(--navy2)}.btn.bad{background:#fde7e5;color:var(--bad)}.btn.sm{padding:.3rem .65rem;font-size:.9rem}
.btn:disabled{opacity:.55;cursor:not-allowed}
.row{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}.row.sp{justify-content:space-between}
label{display:block;font-weight:600;margin:.6rem 0 .2rem}
input,select,textarea{width:100%;font:inherit;padding:.55rem .65rem;border:1px solid #c5cee3;border-radius:9px;background:#fff;color:var(--ink)}
input[type=radio],input[type=checkbox]{width:auto}
textarea{min-height:110px;resize:vertical}
.alert{padding:.7rem .9rem;border-radius:10px;margin:.6rem 0;background:#e8eefc}.alert.warn{background:#fff3d6}.alert.bad{background:#fde7e5;color:var(--bad)}.alert.ok{background:#dff5e8;color:var(--ok)}
.layout{display:grid;grid-template-columns:280px 1fr;gap:1rem}
@media(max-width:760px){.layout{grid-template-columns:1fr}}
.lessons{list-style:none;margin:0;padding:0}
.lessons li button{width:100%;text-align:left;background:#fff;border:1px solid var(--line);border-radius:9px;padding:.55rem .7rem;margin:.25rem 0;font:inherit;cursor:pointer;display:flex;gap:.5rem}
.lessons li button.on{border-color:var(--blue);background:#eef3ff}
.lessons .done{color:var(--ok);font-weight:700}
.bar{height:8px;background:#e3e8f5;border-radius:99px;overflow:hidden}.bar>i{display:block;height:100%;background:var(--ok)}
.video{position:relative;padding-top:56.25%;border-radius:10px;overflow:hidden;background:#000}.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.note{white-space:pre-wrap;word-wrap:break-word}
.opt{display:flex;gap:.5rem;align-items:flex-start;border:1px solid var(--line);border-radius:9px;padding:.5rem .7rem;margin:.3rem 0;background:#fff;font-weight:400}
.opt.right{border-color:var(--ok);background:#effaf3}.opt.wrong{border-color:var(--bad);background:#fdf0ef}
table{width:100%;border-collapse:collapse;font-size:.95rem}th,td{padding:.4rem .5rem;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.tabs{display:flex;gap:.3rem;flex-wrap:wrap;margin:.5rem 0}.tabs button{border:1px solid var(--line);background:#fff;border-radius:99px;padding:.35rem .9rem;font:inherit;cursor:pointer}.tabs button.on{background:var(--navy);color:#fff;border-color:var(--navy)}
.toast{position:fixed;left:50%;bottom:1.2rem;transform:translateX(-50%);background:var(--navy);color:#fff;padding:.6rem 1rem;border-radius:10px;z-index:20;max-width:90vw}
.hidden{display:none}
.foot{max-width:1000px;margin:2rem auto 1rem;padding:0 1rem;color:var(--mut);font-size:.85rem}
.hero{background:linear-gradient(135deg,var(--navy),var(--navy2));color:#fff;border-radius:14px;padding:1.4rem;margin-bottom:1rem}.hero h1{margin:0 0 .3rem}.hero p{margin:.2rem 0 0;opacity:.9}