:root{
  --bg-0:#0b1026;
  --bg-1:#121a3a;
  --bg-2:#1a2350;
  --surface:#182146;
  --surface-2:#202a5b;
  --border:rgba(255,255,255,0.08);
  --text:#eef1ff;
  --text-dim:#a8b1d6;
  --accent:#9b8cff;
  --accent-2:#6ee7ff;
  --accent-3:#ffb86b;
  --good:#4ade80;
  --warn:#fbbf24;
  --bad:#f87171;
  --shadow:0 10px 40px rgba(0,0,0,.45);
  --radius:16px;
  --radius-sm:10px;
  --tr:.2s ease;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  color:var(--text);
  background:
    radial-gradient(1200px 800px at 10% -10%, rgba(155,140,255,.18), transparent 60%),
    radial-gradient(900px 700px at 110% 10%, rgba(110,231,255,.12), transparent 60%),
    radial-gradient(800px 600px at 50% 110%, rgba(255,184,107,.08), transparent 60%),
    linear-gradient(180deg, var(--bg-0), var(--bg-1) 60%, var(--bg-0));
  min-height:100vh;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}

/* ---------- TOPBAR ---------- */
.topbar{
  position:sticky; top:0; z-index:50;
  display:flex; justify-content:space-between; align-items:center; gap:24px;
  padding:14px 28px;
  backdrop-filter:saturate(120%) blur(12px);
  background:rgba(11,16,38,.75);
  border-bottom:1px solid var(--border);
}
.brand{display:flex; align-items:center; gap:14px}
.brand h1{margin:0; font-size:20px; letter-spacing:.3px}
.brand .tagline{margin:0; color:var(--text-dim); font-size:12px}
.logo{
  width:42px; height:42px; border-radius:12px;
  background:linear-gradient(135deg, var(--accent), var(--accent-2));
  display:grid; place-items:center; font-size:22px; color:#0a0f24;
  box-shadow:var(--shadow);
}
.tabs{display:flex; flex-wrap:wrap; gap:6px}
.tab{
  background:transparent; border:1px solid transparent; color:var(--text-dim);
  padding:9px 14px; border-radius:999px; cursor:pointer; font-weight:600;
  font-size:14px; transition:var(--tr);
}
.tab:hover{color:var(--text); background:rgba(255,255,255,.05)}
.tab.active{
  color:#0a0f24;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  border-color:transparent;
  box-shadow:0 6px 20px rgba(155,140,255,.35);
}

/* ---------- LAYOUT ---------- */
main{max-width:1100px; margin:0 auto; padding:30px 22px 80px}
.view{display:none}
.view.active{display:block; animation:fadeIn .25s ease}
@keyframes fadeIn{from{opacity:0; transform:translateY(6px)} to{opacity:1; transform:translateY(0)}}

.hero{padding:18px 0 6px}
.hero h2{font-size:34px; margin:0 0 8px; line-height:1.15}
.hero p{color:var(--text-dim); max-width:720px; font-size:16px}

.cards{
  display:grid; gap:18px; margin-top:28px;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
}
.card{
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:22px;
  cursor:pointer; transition:var(--tr); position:relative; overflow:hidden;
}
.card::before{
  content:""; position:absolute; inset:0;
  background:linear-gradient(135deg, rgba(155,140,255,.12), rgba(110,231,255,.08));
  opacity:0; transition:var(--tr);
}
.card:hover{transform:translateY(-3px); border-color:rgba(155,140,255,.4)}
.card:hover::before{opacity:1}
.card>*{position:relative}
.card-icon{font-size:28px; margin-bottom:8px}
.card h3{margin:0 0 6px; font-size:18px}
.card p{color:var(--text-dim); margin:0 0 14px; font-size:14px}
.card-cta{font-weight:600; color:var(--accent-2)}

.disclaimer{
  margin-top:36px; padding:14px 16px; border-radius:var(--radius-sm);
  background:rgba(251,191,36,.07); border:1px solid rgba(251,191,36,.25);
  color:#ffe9bd; font-size:13.5px;
}

/* ---------- SECTION HEADERS ---------- */
.section-head{
  display:flex; justify-content:space-between; align-items:flex-end;
  flex-wrap:wrap; gap:14px; margin-bottom:18px;
}
.section-head h2{margin:0; font-size:28px}
.section-head .sub{color:var(--text-dim); font-size:14px; margin-top:4px}
.btn{
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  color:#0a0f24; border:none; padding:11px 18px; border-radius:10px;
  font-weight:700; cursor:pointer; transition:var(--tr); font-size:14px;
}
.btn:hover{transform:translateY(-1px); box-shadow:0 6px 20px rgba(155,140,255,.35)}
.btn.ghost{
  background:transparent; color:var(--text);
  border:1px solid var(--border);
}
.btn.ghost:hover{background:rgba(255,255,255,.05); box-shadow:none}
.btn.danger{background:linear-gradient(135deg,#ff8a8a,#ffb86b)}
.btn:disabled{opacity:.5; cursor:not-allowed}

/* ---------- SOP (checklists) ---------- */
.sop-blocks{display:grid; gap:18px; grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.block{
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:20px; position:relative;
}
.block h3{margin:0 0 4px; font-size:18px; display:flex; align-items:center; gap:8px}
.block .when{color:var(--text-dim); font-size:13px; margin-bottom:14px}
.checklist{list-style:none; padding:0; margin:0; display:flex; flex-direction:column; gap:10px}
.check{
  display:flex; gap:10px; align-items:flex-start; padding:11px 12px;
  background:rgba(255,255,255,.03); border:1px solid var(--border); border-radius:10px;
  cursor:pointer; transition:var(--tr); user-select:none;
}
.check:hover{background:rgba(255,255,255,.06)}
.check.done{background:rgba(74,222,128,.10); border-color:rgba(74,222,128,.30)}
.check input{
  margin-top:3px; accent-color:var(--accent); width:18px; height:18px; flex:none;
}
.check .text{flex:1}
.check .text strong{font-weight:600}
.check .text small{display:block; color:var(--text-dim); font-size:12.5px; margin-top:3px}
.check.done .text strong{text-decoration:line-through; color:var(--text-dim)}

.tag{
  display:inline-block; padding:2px 8px; border-radius:6px; font-size:11px;
  background:rgba(155,140,255,.15); color:#cfc6ff; margin-left:6px;
}

/* ---------- GAMIFICATION ---------- */
.gpanel{
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:22px; margin-bottom:18px;
  display:grid; grid-template-columns:1fr 1fr 1fr 1fr; gap:18px;
}
.gpanel .stat{display:flex; flex-direction:column; align-items:center; text-align:center}
.gpanel .stat .num{font-size:28px; font-weight:800; color:#fff}
.gpanel .stat .lbl{color:var(--text-dim); font-size:12px; text-transform:uppercase; letter-spacing:1px}
.level-bar{
  margin-top:10px; height:10px; border-radius:999px;
  background:rgba(255,255,255,.08); overflow:hidden;
}
.level-bar > span{
  display:block; height:100%; background:linear-gradient(90deg,var(--accent),var(--accent-2));
  transition:width .4s ease;
}
.level-name{color:var(--accent-2); font-weight:700; margin-top:4px}

.achievements{
  display:grid; gap:10px;
  grid-template-columns:repeat(auto-fill,minmax(110px,1fr));
}
.ach{
  background:rgba(255,255,255,.03); border:1px solid var(--border);
  border-radius:12px; padding:12px; text-align:center; opacity:.45;
  transition:var(--tr); position:relative;
}
.ach.unlocked{
  opacity:1; background:linear-gradient(135deg, rgba(155,140,255,.18), rgba(110,231,255,.10));
  border-color:rgba(155,140,255,.4);
}
.ach .emoji{font-size:24px}
.ach .name{font-size:12px; font-weight:700; margin-top:4px}
.ach .desc{font-size:11px; color:var(--text-dim); margin-top:2px}

.day-toolbar{
  display:flex; align-items:center; gap:10px; margin-bottom:14px; flex-wrap:wrap;
}
.day-toolbar .date{color:var(--text-dim); font-size:13px}

.streak-row{display:flex; gap:6px; flex-wrap:wrap; margin-top:8px}
.streak-pill{
  width:30px; height:30px; border-radius:10px; display:grid; place-items:center;
  background:rgba(255,255,255,.05); border:1px solid var(--border);
  font-size:12px; color:var(--text-dim);
}
.streak-pill.done{background:rgba(74,222,128,.18); border-color:rgba(74,222,128,.4); color:#bbf7d0}
.streak-pill.today{outline:2px solid var(--accent)}

/* ---------- COURSE ---------- */
.course-grid{
  display:grid; gap:16px;
  grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
  margin-bottom:24px;
}
.day-card{
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:16px; cursor:pointer; transition:var(--tr);
  position:relative; overflow:hidden;
}
.day-card:hover{transform:translateY(-2px); border-color:rgba(155,140,255,.4)}
.day-card.done::after{
  content:"✓"; position:absolute; top:12px; right:14px;
  background:var(--good); color:#0a0f24; width:26px; height:26px;
  border-radius:50%; display:grid; place-items:center; font-weight:900;
}
.day-card.locked{opacity:.55}
.day-card .num{font-size:14px; color:var(--text-dim); font-weight:700}
.day-card h4{margin:6px 0 4px; font-size:16px}
.day-card p{margin:0; color:var(--text-dim); font-size:13px}

.lesson{
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:24px 26px;
}
.lesson h3{margin-top:0; font-size:24px}
.lesson h4{margin-top:22px; font-size:17px; color:var(--accent-2)}
.lesson p{color:var(--text); font-size:15px}
.lesson ul{padding-left:22px}
.lesson ul li{margin-bottom:6px}
.lesson .quote{
  border-left:3px solid var(--accent);
  padding:10px 16px; margin:16px 0;
  background:rgba(155,140,255,.07); border-radius:0 10px 10px 0;
  color:var(--text-dim); font-style:italic;
}
.lesson .exercise{
  margin:16px 0; padding:14px 16px; border-radius:12px;
  background:rgba(110,231,255,.06); border:1px solid rgba(110,231,255,.25);
}
.lesson .exercise strong{color:var(--accent-2)}

.lesson-actions{
  display:flex; gap:10px; justify-content:space-between; margin-top:24px; flex-wrap:wrap;
}

/* ---------- QUIZ ---------- */
.quiz-config{
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:24px; max-width:680px; margin:0 auto;
}
.opt-group{margin-bottom:22px}
.opt-group .label{font-weight:700; margin-bottom:10px; display:block; font-size:14px}
.opt-row{display:flex; gap:10px; flex-wrap:wrap}
.opt-pill{
  background:rgba(255,255,255,.04); border:1px solid var(--border);
  padding:11px 18px; border-radius:999px; cursor:pointer; transition:var(--tr);
  font-weight:600; font-size:14px; color:var(--text);
}
.opt-pill:hover{background:rgba(255,255,255,.08)}
.opt-pill.active{
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  color:#0a0f24; border-color:transparent;
}

.q-progress{
  height:8px; background:rgba(255,255,255,.07); border-radius:999px; margin-bottom:18px;
  overflow:hidden;
}
.q-progress > span{
  display:block; height:100%; background:linear-gradient(90deg,var(--accent),var(--accent-2));
  transition:width .3s ease;
}
.q-meta{
  display:flex; justify-content:space-between; color:var(--text-dim);
  font-size:13px; margin-bottom:10px;
}
.q-card{
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:24px;
}
.q-text{font-size:18px; margin:0 0 18px; line-height:1.45}
.q-options{list-style:none; padding:0; margin:0; display:flex; flex-direction:column; gap:10px}
.q-option{
  background:rgba(255,255,255,.03); border:1px solid var(--border);
  padding:14px 16px; border-radius:12px; cursor:pointer; transition:var(--tr);
  display:flex; gap:12px; align-items:center;
}
.q-option:hover{background:rgba(255,255,255,.06)}
.q-option .letter{
  width:30px; height:30px; border-radius:50%;
  background:rgba(155,140,255,.15); color:var(--accent);
  display:grid; place-items:center; font-weight:800; flex:none; font-size:13px;
}
.q-option.selected{background:rgba(155,140,255,.18); border-color:var(--accent)}
.q-option.correct{background:rgba(74,222,128,.18); border-color:rgba(74,222,128,.5)}
.q-option.correct .letter{background:rgba(74,222,128,.3); color:#bbf7d0}
.q-option.wrong{background:rgba(248,113,113,.15); border-color:rgba(248,113,113,.5)}
.q-option.wrong .letter{background:rgba(248,113,113,.3); color:#fecaca}
.q-option.disabled{cursor:default; pointer-events:none}

.q-explain{
  margin-top:16px; padding:14px 16px; border-radius:12px;
  background:rgba(110,231,255,.06); border:1px solid rgba(110,231,255,.2);
  font-size:14px; line-height:1.55;
}
.q-explain strong{color:var(--accent-2)}

.q-actions{display:flex; justify-content:space-between; margin-top:18px; gap:10px}

.q-result{
  background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); padding:32px; text-align:center;
}
.q-result h3{margin:0 0 8px; font-size:30px}
.q-result .score{
  font-size:60px; font-weight:900; margin:14px 0;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  -webkit-background-clip:text; background-clip:text; -webkit-text-fill-color:transparent;
}
.q-result .msg{color:var(--text-dim); margin-bottom:22px}
.q-result .actions{display:flex; gap:10px; justify-content:center; flex-wrap:wrap}

/* ---------- FOOTER ---------- */
.foot{
  text-align:center; color:var(--text-dim); font-size:12px;
  padding:24px 12px; border-top:1px solid var(--border); margin-top:30px;
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 760px){
  .topbar{flex-direction:column; align-items:flex-start; padding:12px 16px}
  .tabs{width:100%; overflow-x:auto; padding-bottom:4px}
  .gpanel{grid-template-columns:1fr 1fr}
  .hero h2{font-size:26px}
  main{padding:20px 14px 60px}
}

/* small touches */
.kbd{
  display:inline-block; padding:1px 6px; border-radius:4px;
  background:rgba(255,255,255,.08); border:1px solid var(--border);
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace; font-size:12px;
}
.toast{
  position:fixed; bottom:24px; left:50%; transform:translateX(-50%);
  background:var(--surface-2); border:1px solid var(--border);
  padding:10px 16px; border-radius:10px; box-shadow:var(--shadow);
  z-index:100; animation:popIn .3s ease;
}
@keyframes popIn{from{opacity:0; transform:translate(-50%,8px)} to{opacity:1; transform:translate(-50%,0)}}