:root{
  --bg:#0f0720;--bg2:#1a0d34;--panel:#22123f;--panel2:#2b1850;--line:#ffffff1f;
  --pink:#ff63bd;--gold:#ffd66b;--gold2:#ffab62;--violet:#8b5cf6;
  --text:#fff7ff;--muted:#c9b9e2;--good:#4be09a;--bad:#ff6b8b;--warn:#ffb454;
  --radius:18px;--shadow:0 10px 30px #0004;
  --nav-h:62px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
[hidden]{display:none!important}
html{background:#0b0517}
html{scroll-behavior:smooth}
body{margin:0;min-height:100vh;color:var(--text);font:16px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  background:radial-gradient(1200px 600px at 50% -10%,#3d1c70 0%,#170a2e 55%,#0b0517 100%) fixed;
  padding-bottom:calc(var(--nav-h) + env(safe-area-inset-bottom))}
a{color:var(--gold)}
h1,h2,h3{line-height:1.15;margin:0}
h1{font-size:clamp(1.9rem,6vw,3.2rem);font-weight:900;letter-spacing:-.02em}
h2{font-size:1.3rem;font-weight:800}
h3{font-size:1.05rem;font-weight:800}
p{margin:0 0 .6em;color:var(--muted)}
.muted{color:var(--muted)}.small{font-size:.85rem}.center{text-align:center}
.gold{color:var(--gold)}.pink{color:var(--pink)}.good{color:var(--good)}.bad{color:var(--bad)}
.sr{position:absolute;left:-9999px}
:focus-visible{outline:3px solid var(--gold);outline-offset:2px;border-radius:8px}

/* header + nav */
.app-header{position:sticky;top:0;z-index:30;display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:12px max(16px,4vw);background:#120a26e6;backdrop-filter:blur(12px);border-bottom:1px solid var(--line);padding-top:max(12px,env(safe-area-inset-top))}
.brand{display:flex;align-items:center;gap:10px;font-weight:900;letter-spacing:.2px;color:var(--text);text-decoration:none;font-size:1.15rem}
.brand img{width:32px;height:32px;border-radius:9px}
.brand b{color:var(--gold)}
.hdr-right{display:flex;gap:8px;align-items:center}
.pill{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:999px;padding:6px 12px;color:var(--muted);font-size:.82rem;white-space:nowrap}
.pill.hot{color:var(--gold);border-color:#ffd66b55}
.nav{position:fixed;left:0;right:0;bottom:0;z-index:40;display:flex;justify-content:space-around;height:calc(var(--nav-h) + env(safe-area-inset-bottom));
  padding-bottom:env(safe-area-inset-bottom);background:#150a2bf2;backdrop-filter:blur(14px);border-top:1px solid var(--line)}
.nav a{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;color:var(--muted);text-decoration:none;font-size:.72rem;font-weight:700}
.nav a .ic{font-size:1.25rem;line-height:1}
.nav a[aria-current="page"]{color:var(--gold)}
.nav a[aria-current="page"] .ic{transform:translateY(-1px) scale(1.1)}
.quiet .nav{display:none}.quiet{padding-bottom:0}
@media(min-width:900px){
  body{padding-bottom:0}
  .nav{position:static;height:auto;background:none;border:0;backdrop-filter:none;padding:0;gap:4px;justify-content:flex-start;flex:1;margin-left:24px}
  .nav a{flex:0 0 auto;flex-direction:row;gap:7px;padding:8px 14px;border-radius:999px;font-size:.92rem}
  .nav a[aria-current="page"]{background:#ffffff14}
  .app-header{flex-wrap:nowrap}
  .quiet .nav{display:none}
}

main{max-width:1080px;margin:0 auto;padding:22px max(16px,3vw) 48px}
.view{animation:fade .25s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
@media(prefers-reduced-motion:reduce){.view{animation:none}html{scroll-behavior:auto}}

/* hero */
.hero{padding:12px 0 22px}
.eyebrow{color:var(--pink);font-weight:800;letter-spacing:2px;text-transform:uppercase;font-size:.74rem;margin-bottom:8px}
.hero h1 span{color:var(--gold);text-shadow:0 0 28px #ffce5b55}
.hero p{max-width:60ch;margin-top:10px;font-size:1.02rem}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}

/* buttons */
.btn{appearance:none;border:0;border-radius:14px;padding:12px 18px;font:inherit;font-weight:800;cursor:pointer;color:#1a0b30;
  background:linear-gradient(135deg,var(--gold),var(--gold2));box-shadow:0 6px 20px #ffce5b26;transition:transform .12s,filter .12s;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px}
.btn:hover{filter:brightness(1.06)}.btn:active{transform:scale(.97)}
.btn.sec{background:#ffffff10;border:1px solid #ffffff2e;color:var(--text);box-shadow:none}
.btn.pink{background:linear-gradient(135deg,var(--pink),#c06bff);color:#fff;box-shadow:0 6px 20px #ff63bd33}
.btn.danger{background:#ff6b8b22;border:1px solid #ff6b8b66;color:#ffc2cf;box-shadow:none}
.btn.sm{padding:8px 12px;font-size:.85rem;border-radius:11px}
.btn[disabled]{opacity:.45;cursor:not-allowed;filter:none;transform:none}

/* cards & grids */
.card{background:linear-gradient(150deg,#2c1952e6,#1b0e34e6);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.grid.tight{grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:10px}
.sec{margin:28px 0 12px;display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap}
.subject-card{display:flex;flex-direction:column;gap:8px;text-decoration:none;color:inherit;cursor:pointer;transition:transform .15s,border-color .15s}
.subject-card:hover{transform:translateY(-3px);border-color:#ffd66b66}
.subject-card .emoji{font-size:1.9rem}
.subject-card p{margin:0;font-size:.9rem}
.bar{height:8px;background:#ffffff14;border-radius:99px;overflow:hidden}
.bar>i{display:block;height:100%;background:linear-gradient(90deg,var(--pink),var(--gold));border-radius:99px;transition:width .3s}
.stat{padding:14px;border-radius:16px;background:#ffffff0a;border:1px solid var(--line)}
.stat b{display:block;font-size:1.7rem;line-height:1.1;color:var(--gold)}
.stat span{font-size:.8rem;color:var(--muted)}

/* chips */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{appearance:none;border:1px solid var(--line);background:#ffffff0b;color:var(--text);border-radius:999px;padding:8px 14px;font:inherit;font-weight:700;font-size:.88rem;cursor:pointer}
.chip[aria-pressed="true"]{background:linear-gradient(135deg,var(--gold),var(--gold2));color:#1a0b30;border-color:transparent}

/* topic list */
.topic{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:14px;border-radius:15px;background:#ffffff08;border:1px solid var(--line)}
.topic .t{font-weight:700}.topic .m{font-size:.8rem;color:var(--muted)}
.topic.weak{border-color:#ff6b8b66}

/* practice / test */
.sess{max-width:820px;margin:0 auto}
.sess-top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px}
.qtext{font-size:clamp(1.1rem,3.2vw,1.35rem);font-weight:750;line-height:1.4;margin:16px 0 18px;white-space:pre-line}
.opts{display:grid;gap:10px}
.opt{display:flex;gap:12px;align-items:flex-start;text-align:left;width:100%;appearance:none;font:inherit;color:var(--text);cursor:pointer;
  padding:13px 14px;border-radius:15px;border:1.5px solid #ffffff26;background:#ffffff0a;transition:border-color .12s,background .12s}
.opt:hover:not([disabled]){border-color:#ffd66b88;background:#ffffff12}
.opt .k{flex:0 0 auto;width:28px;height:28px;border-radius:9px;display:grid;place-items:center;font-weight:900;font-size:.85rem;background:#ffffff14;color:var(--gold)}
.opt.sel{border-color:var(--gold);background:#ffd66b1c}
.opt.sel .k{background:var(--gold);color:#1a0b30}
.opt.right{border-color:var(--good);background:#16482f}.opt.right .k{background:var(--good);color:#06301c}
.opt.wrong{border-color:var(--bad);background:#541b35}.opt.wrong .k{background:var(--bad);color:#3a0a1b}
.opt[disabled]{cursor:default}
.explain{margin-top:14px;padding:14px;border-radius:14px;background:#ffffff0d;border-left:4px solid var(--gold)}
.explain.ok{border-left-color:var(--good)}.explain.no{border-left-color:var(--bad)}
.explain b{display:block;margin-bottom:4px}
.explain p{margin:0;color:var(--text)}
.tag{display:inline-block;font-size:.72rem;font-weight:800;letter-spacing:.5px;text-transform:uppercase;padding:3px 9px;border-radius:99px;background:#ff63bd22;color:#ffb2de}
.icon-btn{appearance:none;border:1px solid var(--line);background:#ffffff0d;color:var(--text);border-radius:12px;width:40px;height:40px;font-size:1.1rem;cursor:pointer}
.icon-btn[aria-pressed="true"]{color:var(--gold);border-color:#ffd66b88;background:#ffd66b1c}

/* mock test */
.test-bar{position:sticky;top:57px;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 12px;margin:-6px -6px 12px;
  background:#170b2cf0;backdrop-filter:blur(10px);border:1px solid var(--line);border-radius:14px}
.timer{font-variant-numeric:tabular-nums;font-weight:900;font-size:1.2rem;color:var(--gold)}
.timer.low{color:var(--bad);animation:pulse 1s infinite}
@keyframes pulse{50%{opacity:.55}}
.test-layout{display:grid;gap:16px;grid-template-columns:1fr}
@media(min-width:900px){.test-layout{grid-template-columns:1fr 270px;align-items:start}}
.palette{display:grid;grid-template-columns:repeat(auto-fill,minmax(40px,1fr));gap:7px}
.pbtn{appearance:none;border:1.5px solid #ffffff2e;background:#ffffff0c;color:var(--text);border-radius:10px;height:40px;font:inherit;font-weight:800;cursor:pointer}
.pbtn.visited{background:#ff6b8b26;border-color:#ff6b8b88}
.pbtn.answered{background:#4be09a2e;border-color:var(--good)}
.pbtn.marked{background:#8b5cf63a;border-color:var(--violet)}
.pbtn.marked.answered{box-shadow:inset 0 0 0 2px var(--good)}
.pbtn.cur{outline:3px solid var(--gold);outline-offset:1px}
.legend{display:flex;flex-wrap:wrap;gap:6px 12px;font-size:.75rem;color:var(--muted);margin-top:12px}
.legend i{display:inline-block;width:12px;height:12px;border-radius:4px;vertical-align:-1px;margin-right:5px;border:1.5px solid}
.test-nav{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;align-items:center}
.palette-toggle{display:inline-flex}
@media(min-width:900px){.palette-toggle{display:none}.palette-wrap{display:block!important}}
.palette-wrap{display:none}
.palette-wrap.open{display:block}
.tabs{display:flex;gap:6px;overflow-x:auto;padding-bottom:4px;margin-bottom:10px}
.tab{appearance:none;flex:0 0 auto;border:1px solid var(--line);background:#ffffff0a;color:var(--muted);border-radius:10px;padding:8px 12px;font:inherit;font-weight:700;font-size:.82rem;cursor:pointer}
.tab[aria-pressed="true"]{background:#ffd66b22;color:var(--gold);border-color:#ffd66b77}

/* results */
.score-ring{width:150px;height:150px;border-radius:50%;display:grid;place-items:center;margin:6px auto 12px;
  background:conic-gradient(var(--gold) calc(var(--p)*1%),#ffffff14 0);position:relative}
.score-ring::after{content:"";position:absolute;inset:11px;border-radius:50%;background:#1d0f38}
.score-ring b{position:relative;z-index:1;font-size:2rem;color:var(--gold);text-align:center;line-height:1}
.score-ring small{display:block;font-size:.72rem;color:var(--muted);font-weight:600}
table{width:100%;border-collapse:collapse;font-size:.9rem}
th,td{padding:10px 8px;text-align:left;border-bottom:1px solid var(--line)}
th{color:var(--muted);font-weight:700;font-size:.78rem;text-transform:uppercase;letter-spacing:.5px}
td.n,th.n{text-align:right;font-variant-numeric:tabular-nums}
.tbl-wrap{overflow-x:auto}
.review-item{padding:14px 0;border-bottom:1px solid var(--line)}
.review-item .opt{padding:9px 12px;font-size:.92rem}

/* formulas */
.fgroup{margin-bottom:12px}
details.fgroup>summary{cursor:pointer;list-style:none;font-weight:800;padding:14px 16px;border-radius:14px;background:#ffffff0a;border:1px solid var(--line);display:flex;justify-content:space-between}
details.fgroup[open]>summary{border-bottom-left-radius:0;border-bottom-right-radius:0}
details.fgroup>summary::after{content:"＋";color:var(--gold)}
details.fgroup[open]>summary::after{content:"－"}
.fbody{border:1px solid var(--line);border-top:0;border-radius:0 0 14px 14px;padding:6px 16px 12px;background:#ffffff06}
.formula{border-left:3px solid var(--pink);padding:8px 12px;margin:10px 0;background:#ffffff08;border-radius:0 12px 12px 0}
.formula b{display:block;color:var(--gold);font-size:.86rem}
.formula span{font-size:.97rem}
input[type=text],input[type=search],select,textarea{width:100%;font:inherit;color:var(--text);background:#ffffff0d;border:1.5px solid #ffffff2a;border-radius:12px;padding:11px 13px}
textarea{min-height:84px;resize:vertical}
label{display:block;font-weight:700;font-size:.85rem;margin:12px 0 5px;color:var(--muted)}
select option{color:#111}

/* modal + toast */
.modal-bg{position:fixed;inset:0;background:#06020f99;backdrop-filter:blur(3px);z-index:100;display:grid;place-items:center;padding:18px}
.modal{max-width:440px;width:100%;background:#241345;border:1px solid #ffffff30;border-radius:20px;padding:22px;box-shadow:0 20px 60px #000a}
.modal h2{margin-bottom:8px}.modal .actions{justify-content:flex-end}
.toast{position:fixed;left:50%;bottom:calc(var(--nav-h) + 18px + env(safe-area-inset-bottom));transform:translateX(-50%);z-index:120;background:#2a1650;border:1px solid #ffd66b66;
  color:var(--text);padding:11px 18px;border-radius:14px;box-shadow:var(--shadow);max-width:92vw;font-weight:600;font-size:.92rem}
.banner{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;border:1px solid #ffd66b66;background:#ffd66b14;border-radius:16px;padding:14px 16px;margin-bottom:16px}
.ad-slot{margin:22px auto;min-height:60px;max-width:728px;border-radius:12px}
.ad-dummy{display:grid;place-items:center;border:1.5px dashed #ffffff33;color:var(--muted);font-size:.8rem}
.offline{background:#ffb45422;color:var(--warn);border-color:#ffb45466}
.empty{padding:34px 12px;text-align:center;color:var(--muted)}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.row.sp{justify-content:space-between}
.hr{height:1px;background:var(--line);margin:18px 0}
footer{text-align:center;color:#a995c7;font-size:.8rem;padding:6px 16px 26px}
@media print{.nav,.app-header,.actions,.btn{display:none!important}body{background:#fff;color:#000}}

/* ---- v3: passages, levels ---- */
.passage{white-space:pre-wrap;background:#ffffff0d;border:1px solid #ffffff1f;border-radius:12px;padding:12px 14px;margin:12px 0 4px;font-size:.95rem;line-height:1.55;max-height:260px;overflow:auto}
.qtext{white-space:pre-wrap}
.lvl-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(74px,1fr));gap:10px}
.lvl{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;min-height:68px;padding:8px 4px;border-radius:14px;border:1px solid #ffffff26;background:#ffffff0d;color:var(--text);font:inherit;cursor:pointer}
.lvl b{font-size:1.15rem}.lvl span{font-size:.72rem;color:var(--gold,#ffd166);letter-spacing:1px}
.lvl.done{background:#4be09a1a;border-color:#4be09a55}
.lvl.cur{border-color:var(--violet,#8b5cf6);box-shadow:0 0 0 2px #8b5cf655}
.lvl.locked{opacity:.45}
select{background:#ffffff12;color:var(--text);border:1px solid #ffffff30;border-radius:10px;padding:8px 10px;font:inherit;max-width:60%}
.trick{margin:8px 0 0;padding:8px 10px;border-radius:10px;background:#ffd16622;border:1px solid #ffd16655;font-size:.92rem}
.trick-row{padding:8px 10px;margin-bottom:6px;border-radius:10px;background:#ffffff0d;border:1px solid #ffffff1a}
.test-top{margin:10px 0 4px;justify-content:flex-start}