/* ============================================================================
   Excel Mastery — Stylesheet
   Andalan Motors Group. Tema hijau Excel + aksen biru korporat.
   ==========================================================================*/
:root{
  --green:#107c41; --green-d:#0b5e31; --green-l:#e7f4ec;
  --blue:#2563eb; --blue-d:#1d4ed8;
  --ink:#0f172a; --ink-2:#334155; --muted:#64748b; --muted-2:#94a3b8;
  --bg:#f1f5f9; --bg-2:#e2e8f0; --card:#ffffff; --line:#e2e8f0; --line-2:#cbd5e1;
  --ok:#16a34a; --ok-bg:#dcfce7; --err:#dc2626; --err-bg:#fee2e2; --warn:#d97706; --warn-bg:#fef3c7;
  --gold:#f59e0b;
  --radius:16px; --radius-s:10px; --shadow:0 1px 3px rgba(15,23,42,.08),0 8px 24px -12px rgba(15,23,42,.18);
  --shadow-lg:0 20px 50px -20px rgba(15,23,42,.35);
  --font:'Plus Jakarta Sans',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --ink:#e8eef7; --ink-2:#cbd5e1; --muted:#94a3b8; --muted-2:#64748b;
    --bg:#0b1220; --bg-2:#111a2e; --card:#131c30; --line:#243248; --line-2:#33455f;
    --green-l:#0f2a1c; --shadow:0 1px 3px rgba(0,0,0,.4),0 10px 30px -14px rgba(0,0,0,.6);
    --shadow-lg:0 24px 60px -24px rgba(0,0,0,.7);
  }
}
:root[data-theme="dark"]{
  --ink:#e8eef7; --ink-2:#cbd5e1; --muted:#94a3b8; --muted-2:#64748b;
  --bg:#0b1220; --bg-2:#111a2e; --card:#131c30; --line:#243248; --line-2:#33455f;
  --green-l:#0f2a1c;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);background:var(--bg);color:var(--ink);line-height:1.6;font-size:15px;-webkit-font-smoothing:antialiased}
img{max-width:100%}
[hidden]{display:none!important}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.25;margin:0 0 .5em;letter-spacing:-.01em}
h1{font-size:1.7rem;font-weight:800}
code{font-family:var(--mono);font-size:.9em;background:var(--bg-2);padding:.1em .4em;border-radius:6px;color:var(--green-d)}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) code{color:#5bd98a}}
:root[data-theme="dark"] code{color:#5bd98a}
kbd{font-family:var(--mono);font-size:.78em;background:var(--card);border:1px solid var(--line-2);border-bottom-width:2px;border-radius:6px;padding:.12em .5em;color:var(--ink);white-space:nowrap;box-shadow:0 1px 0 rgba(0,0,0,.04)}
.muted{color:var(--muted)}
.tiny{font-size:.8rem}
.ta-r{text-align:right}
.ok-text{color:var(--ok)}

/* -------------------------------------------------------------- buttons ---*/
.btn{display:inline-flex;align-items:center;gap:.5em;justify-content:center;font-family:inherit;font-weight:600;font-size:.92rem;padding:.62em 1.1em;border-radius:var(--radius-s);border:1px solid var(--line-2);background:var(--card);color:var(--ink);cursor:pointer;transition:.15s;text-decoration:none;white-space:nowrap}
.btn:hover{transform:translateY(-1px);text-decoration:none;box-shadow:var(--shadow)}
.btn:active{transform:translateY(0)}
.btn.primary{background:linear-gradient(135deg,var(--green),var(--green-d));border-color:transparent;color:#fff;box-shadow:0 4px 14px -4px rgba(16,124,65,.5)}
.btn.primary:hover{box-shadow:0 8px 22px -6px rgba(16,124,65,.6)}
.btn.ghost{background:transparent}
.btn.block{width:100%;margin-top:8px}
.btn.locked-btn{opacity:.55;cursor:not-allowed}
.btn:disabled{opacity:.6;cursor:default;transform:none;box-shadow:none}
.btn.is-done{background:var(--ok-bg);color:var(--ok);border-color:transparent}

/* --------------------------------------------------------------- topbar ---*/
.topbar{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--card) 88%,transparent);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);padding-top:env(safe-area-inset-top,0)}
.topbar-inner{max-width:1120px;margin:0 auto;padding:10px 20px;display:flex;align-items:center;gap:18px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:800}
.brand:hover{text-decoration:none}
.brand-mark{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,var(--green),var(--green-d));color:#fff;font-weight:800;font-size:1.2rem;box-shadow:0 4px 12px -4px rgba(16,124,65,.6)}
.brand-mark.big{width:56px;height:56px;font-size:1.8rem;border-radius:16px}
.brand-text{display:flex;flex-direction:column;line-height:1.1;font-size:1.05rem}
.brand-text small{font-weight:500;color:var(--muted);font-size:.68rem}
.mainnav{display:flex;gap:4px;margin-left:8px}
.mainnav a{color:var(--ink-2);font-weight:600;padding:.5em .9em;border-radius:9px;font-size:.9rem}
.mainnav a:hover{background:var(--bg-2);text-decoration:none}
.mainnav a.on{background:var(--green-l);color:var(--green-d)}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .mainnav a.on{color:#5bd98a}}
.userbox{margin-left:auto;display:flex;align-items:center;gap:14px}
.xpmini{min-width:120px}
.xpmini-top{display:flex;justify-content:space-between;font-size:.72rem;font-weight:700;margin-bottom:3px}
.xpmini-top .lvl{color:var(--green-d)}
.xpmini-top .xpnum{color:var(--muted)}
.xpmini-bar{height:6px;background:var(--bg-2);border-radius:99px;overflow:hidden}
.xpmini-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--green),#34d399);border-radius:99px;transition:width .6s}
.streak{font-weight:700;font-size:.85rem}
.menu{position:relative}
.avatar{width:38px;height:38px;border-radius:50%;border:2px solid var(--card);color:#fff;font-weight:800;cursor:pointer;box-shadow:0 0 0 1px var(--line-2)}
.dropdown{position:absolute;right:0;top:calc(100% + 10px);background:var(--card);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow-lg);min-width:210px;padding:8px;opacity:0;visibility:hidden;transform:translateY(-6px);transition:.16s}
.menu.open .dropdown{opacity:1;visibility:visible;transform:none}
.dd-head{padding:10px 12px;border-bottom:1px solid var(--line);margin-bottom:6px;display:flex;flex-direction:column}
.dd-head span{font-size:.78rem;color:var(--muted)}
.dropdown a{display:block;padding:.6em .75em;border-radius:9px;color:var(--ink);font-weight:600;font-size:.9rem}
.dropdown a:hover{background:var(--bg-2);text-decoration:none}
.dropdown a.danger{color:var(--err)}
.navtoggle{display:none;background:none;border:none;font-size:1.4rem;cursor:pointer;color:var(--ink)}

/* ---------------------------------------------------------------- layout --*/
.page{max-width:1120px;margin:0 auto;padding:26px 20px 60px}
.sitefoot{border-top:1px solid var(--line);color:var(--muted);font-size:.82rem;text-align:center;padding:22px 20px calc(22px + env(safe-area-inset-bottom,0))}
.crumbs{font-size:.82rem;color:var(--muted);margin-bottom:16px}
.crumbs span{margin:0 6px}

/* ----------------------------------------------------------------- auth ---*/
.auth-body{background:var(--bg)}
.auth-wrap{min-height:100vh;display:grid;grid-template-columns:1fr 1fr}
.auth-visual{background:linear-gradient(150deg,var(--green-d),#0a3d22 60%,#062615);color:#fff;padding:56px 48px;display:flex;align-items:center;position:relative;overflow:hidden}
.auth-visual::after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 80% 20%,rgba(52,211,153,.25),transparent 45%),radial-gradient(circle at 10% 90%,rgba(37,99,235,.25),transparent 40%)}
.auth-visual-inner{position:relative;z-index:1;max-width:420px}
.auth-visual h1{font-size:2.3rem;font-weight:800;margin:18px 0 10px}
.auth-visual p{color:rgba(255,255,255,.85);font-size:1.02rem}
.auth-feats{list-style:none;padding:0;margin:26px 0 0;display:flex;flex-direction:column;gap:12px}
.auth-feats li{background:rgba(255,255,255,.1);padding:12px 16px;border-radius:12px;font-weight:500;font-size:.92rem;border:1px solid rgba(255,255,255,.12)}
.auth-form{display:flex;align-items:center;justify-content:center;padding:40px 24px}
.auth-card{width:100%;max-width:400px;background:var(--card);border:1px solid var(--line);border-radius:20px;padding:34px;box-shadow:var(--shadow)}
.auth-card.wide{max-width:520px}
.auth-card h2{font-size:1.5rem}
.auth-card .brand-mark{margin-bottom:14px}
.install-wrap{min-height:100vh;display:grid;place-items:center;padding:30px 18px}
form label{display:block;font-weight:600;font-size:.82rem;margin:14px 0 6px;color:var(--ink-2)}
form input,form select{width:100%;padding:.7em .85em;border:1px solid var(--line-2);border-radius:10px;font-family:inherit;font-size:.95rem;background:var(--card);color:var(--ink);transition:.15s}
form input:focus{outline:none;border-color:var(--green);box-shadow:0 0 0 3px var(--green-l)}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.switch{margin-top:18px;font-size:.9rem;color:var(--muted);text-align:center}
.alert{padding:12px 14px;border-radius:12px;font-size:.9rem;margin:14px 0}
.alert.err{background:var(--err-bg);color:var(--err)}
.alert.ok{background:var(--ok-bg);color:var(--green-d)}
.steps-info{display:flex;flex-direction:column;gap:8px;margin:16px 0}
.si{background:var(--bg-2);padding:10px 14px;border-radius:10px;font-size:.88rem}
.si b{display:inline-grid;place-items:center;width:22px;height:22px;background:var(--green);color:#fff;border-radius:50%;margin-right:8px;font-size:.8rem}

/* ----------------------------------------------------------------- hero ---*/
.hero{display:grid;grid-template-columns:1fr auto;gap:28px;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:30px 32px;box-shadow:var(--shadow);margin-bottom:20px}
.hero .hi{color:var(--muted);margin:0 0 4px}
.hero h1{font-size:1.9rem;margin-bottom:6px}
.overall{margin-top:18px}
.overall-bar{height:12px;background:var(--bg-2);border-radius:99px;overflow:hidden;margin-bottom:6px}
.overall-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--green),#34d399);border-radius:99px;transition:width .8s}
.overall span{font-size:.85rem;color:var(--muted);font-weight:600}
.levelcard{display:flex;flex-direction:column;align-items:center;gap:10px;text-align:center}
.ring{--pct:0;width:110px;height:110px;border-radius:50%;background:conic-gradient(var(--green) calc(var(--pct)*1%),var(--bg-2) 0);display:grid;place-items:center}
.ring-in{width:84px;height:84px;border-radius:50%;background:var(--card);display:grid;place-items:center;flex-direction:column}
.ring-in .lv{font-size:1.8rem;font-weight:800;color:var(--green-d);line-height:1}
.ring-in small{font-size:.65rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em}
.levelmeta{display:flex;flex-direction:column;gap:2px}
.levelmeta strong{font-size:1.05rem}

/* ----------------------------------------------------------------- kpis ---*/
.kpirow{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-bottom:26px}
.kpi{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px;display:flex;align-items:center;gap:12px;box-shadow:var(--shadow)}
.kpi-ic{font-size:1.5rem}
.kpi b{display:block;font-size:1.3rem;font-weight:800;line-height:1}
.kpi small{color:var(--muted);font-size:.75rem}

/* -------------------------------------------------------------- roadmap ---*/
.roadmap{position:relative;display:flex;flex-direction:column;gap:16px}
.roadmap::before{content:"";position:absolute;left:31px;top:20px;bottom:20px;width:2px;background:linear-gradient(var(--line-2),transparent);z-index:0}
.rmcard{position:relative;display:flex;gap:18px;z-index:1}
.rmnode{flex:0 0 auto;width:44px;height:44px;border-radius:50%;background:var(--mc,var(--green));color:#fff;display:grid;place-items:center;font-weight:800;box-shadow:0 0 0 4px var(--bg);margin-top:14px}
.rmcard.done .rmnode{background:var(--ok)}
.rmcard.done .rmnode span{display:none}
.rmcard.done .rmnode::after{content:"✓";font-size:1.3rem}
.rmcard.locked .rmnode{background:var(--muted-2)}
.rmbody{flex:1;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;box-shadow:var(--shadow);transition:.18s;border-left:4px solid var(--mc,var(--green))}
.rmcard:not(.locked) .rmbody:hover{transform:translateX(3px);box-shadow:var(--shadow-lg)}
.rmcard.locked .rmbody{opacity:.72}
.rmhead{display:flex;align-items:flex-start;gap:14px}
.rmicon{font-size:1.9rem;line-height:1}
.rmtitle{flex:1}
.rmtitle h3{margin:0;font-size:1.15rem}
.rmtitle p{margin:2px 0 0;color:var(--muted);font-size:.85rem}
.rmtags{display:flex;flex-direction:column;gap:6px;align-items:flex-end}
.rmdesc{color:var(--ink-2);font-size:.9rem;margin:12px 0 16px}
.rmfoot{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.tag{font-size:.72rem;font-weight:700;padding:.28em .7em;border-radius:99px;background:var(--green-l);color:var(--green-d);white-space:nowrap}
.tag.ghost{background:var(--bg-2);color:var(--muted)}
.tag.lv-mid{background:#dbeafe;color:#1d4ed8}
.tag.lv-adv{background:#f3e8ff;color:#7c3aed}
.tag.lv-exp{background:#ffe4e6;color:#be123c}
.mini-progress{display:flex;align-items:center;gap:10px;flex:1;min-width:180px}
.mini-progress.wide{margin-top:14px}
.mp-bar{flex:1;height:8px;background:var(--bg-2);border-radius:99px;overflow:hidden}
.mp-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--green),#34d399);border-radius:99px;transition:width .6s}
.mini-progress span{font-size:.78rem;color:var(--muted);font-weight:600;white-space:nowrap}

/* -------------------------------------------------------------- module ----*/
.modhero{display:flex;gap:20px;align-items:center;background:var(--card);border:1px solid var(--line);border-left:5px solid var(--mc);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);margin-bottom:22px}
.modhero-ic{font-size:3rem}
.modhero-txt{flex:1}
.modhero-txt .tags{display:flex;gap:8px;margin-bottom:8px}
.modhero-txt h1{margin:0 0 6px}
.modhero-txt p{color:var(--ink-2);margin:0 0 12px;font-size:.92rem}
.modlayout{display:grid;grid-template-columns:230px 1fr;gap:26px;align-items:start}
.modtoc{position:sticky;top:80px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px;box-shadow:var(--shadow)}
.modtoc h4{margin:0 0 10px;font-size:.8rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.modtoc ol{list-style:none;margin:0;padding:0;counter-reset:t}
.toc-item{display:flex;gap:8px;align-items:center;padding:.5em .6em;border-radius:9px;color:var(--ink-2);font-size:.86rem;font-weight:600}
.toc-item:hover{background:var(--bg-2);text-decoration:none}
.toc-item.ok{color:var(--ok)}
.tic{opacity:.8}

/* ---------------------------------------------------------------- lesson --*/
.lesson{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px 30px;box-shadow:var(--shadow);margin-bottom:20px}
.lesson-head{display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line);padding-bottom:14px;margin-bottom:18px}
.lesson-head h2{margin:0;font-size:1.35rem}
.xp-pill{background:var(--green-l);color:var(--green-d);font-weight:700;font-size:.78rem;padding:.3em .8em;border-radius:99px;white-space:nowrap}
.lesson-content{font-size:.96rem;color:var(--ink-2)}
.lesson-content h3{font-size:1.08rem;color:var(--ink);margin:1.5em 0 .5em}
.lesson-content p{margin:.7em 0}
.lesson-content .lead{font-size:1.05rem;color:var(--ink);font-weight:500}
.lesson-foot{margin-top:22px;border-top:1px solid var(--line);padding-top:16px}

/* callouts, formula boxes, tables inside lessons */
.callout{border-radius:12px;padding:14px 16px;margin:16px 0;font-size:.9rem;border:1px solid var(--line);background:var(--bg-2)}
.callout.tip{background:var(--green-l);border-color:transparent}
.callout.warn{background:var(--warn-bg);border-color:transparent;color:#92400e}
.callout.info{background:#eff6ff;border-color:transparent;color:#1e40af}
.callout.data{background:#fdf2f8;border-color:transparent;color:#9d174d}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .callout.warn,:root:not([data-theme="light"]) .callout.info,:root:not([data-theme="light"]) .callout.data{color:var(--ink);background:var(--bg-2)}}
.formula{background:#0f172a;color:#e2e8f0;border-radius:10px;padding:12px 14px;margin:14px 0;font-family:var(--mono);font-size:.86rem;overflow-x:auto;display:flex;flex-direction:column;gap:6px}
.formula code{background:transparent;color:#7ee2a8;padding:0;font-size:.9rem;white-space:pre}
.formula .fnote{color:#94a3b8;font-family:var(--font);font-size:.8rem}
.tablewrap{overflow-x:auto;margin:16px 0;border:1px solid var(--line);border-radius:12px}
table.ref{width:100%;border-collapse:collapse;font-size:.86rem;min-width:420px}
table.ref th{background:var(--bg-2);text-align:left;padding:10px 12px;font-weight:700;color:var(--ink-2);border-bottom:1px solid var(--line)}
table.ref td{padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
table.ref tr:last-child td{border-bottom:none}
table.ref code{font-size:.85em}
.steps{margin:14px 0;padding-left:20px}
.steps li{margin:8px 0}

/* --------------------------------------------------------------- cta card -*/
.cta-card{display:flex;align-items:center;gap:18px;background:linear-gradient(135deg,var(--green-l),transparent);border:1px solid var(--line);border-radius:var(--radius);padding:20px 24px;margin-bottom:20px}
.cta-ic{font-size:2rem}
.cta-txt{flex:1}
.cta-txt h3{margin:0 0 4px}
.cta-txt p{margin:0;color:var(--muted);font-size:.88rem}

/* --------------------------------------------------------------- practice -*/
.sec-title{font-size:1.25rem;margin:26px 0 4px}
.practice-list{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);margin-bottom:20px}
.challist{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:16px 0}
.chal{display:flex;align-items:center;gap:12px;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:var(--bg);color:var(--ink)}
.chal:hover{text-decoration:none;border-color:var(--green);transform:translateY(-1px);box-shadow:var(--shadow)}
.chal.done{background:var(--green-l);border-color:transparent}
.chal-badge{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;background:var(--card);font-weight:700;color:var(--green-d)}
.chal-info strong{display:block;font-size:.9rem}
.chal-info small{color:var(--muted);font-size:.76rem}
.modnav{margin-top:10px}

/* ============================ Mini Spreadsheet ============================ */
.practice{max-width:100%}
.prac-head h1{margin-bottom:4px}
.prac-grid{display:grid;grid-template-columns:250px 1fr;gap:20px;align-items:start;margin-top:18px}
.prac-side{position:sticky;top:80px}
.prac-tabs{display:flex;flex-direction:column;gap:8px}
.ptab{display:flex;gap:10px;align-items:center;text-align:left;padding:11px 13px;border:1px solid var(--line);border-radius:11px;background:var(--card);cursor:pointer;font-family:inherit;font-weight:600;font-size:.85rem;color:var(--ink-2);transition:.14s;width:100%}
.ptab:hover{border-color:var(--green)}
.ptab.active{background:var(--green);color:#fff;border-color:transparent}
.ptab.solved .ptab-badge{background:var(--ok);color:#fff}
.ptab-badge{flex:0 0 auto;width:24px;height:24px;border-radius:7px;background:var(--bg-2);display:grid;place-items:center;font-size:.75rem;font-weight:700;color:var(--muted)}
.ptab.active .ptab-badge{background:rgba(255,255,255,.25);color:#fff}
.ptab-t{flex:1;line-height:1.2}
.ptab-pts{font-size:.7rem;opacity:.7}

.prac-task{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--green);border-radius:14px;padding:18px 20px;box-shadow:var(--shadow);margin-bottom:16px}
.prac-task h3{margin:0 0 8px;font-size:1.05rem}
.prac-task .ptask-prompt{color:var(--ink-2);font-size:.92rem}
.prac-task .ptask-meta{margin-top:10px;display:flex;gap:8px;flex-wrap:wrap}

.ssheet{background:var(--card);border:1px solid var(--line);border-radius:14px;overflow:hidden;box-shadow:var(--shadow)}
.formula-bar{display:flex;align-items:center;gap:0;border-bottom:1px solid var(--line);background:var(--bg-2)}
.formula-bar .fx{font-family:var(--mono);font-style:italic;font-weight:700;color:var(--muted);padding:0 14px}
.formula-bar .active-cell{font-family:var(--mono);font-weight:700;background:var(--card);padding:10px 12px;min-width:56px;text-align:center;border-left:1px solid var(--line);border-right:1px solid var(--line);color:var(--green-d)}
.formula-input{flex:1;border:none;background:var(--card);padding:11px 14px;font-family:var(--mono);font-size:.9rem;color:var(--ink)}
.formula-input:focus{outline:none;box-shadow:inset 0 0 0 2px var(--green-l)}
.grid-scroll{overflow:auto;max-height:60vh}
.grid{display:table;border-collapse:collapse;font-size:.82rem;width:max-content}
.grid .grow{display:table-row}
.grid .gcell{display:table-cell;border:1px solid var(--line);padding:5px 9px;white-space:nowrap;max-width:230px;overflow:hidden;text-overflow:ellipsis;color:var(--ink-2)}
.grid .ghead{position:sticky;top:0;background:var(--bg-2);font-weight:700;color:var(--ink);z-index:2;text-align:center}
.grid .gcorner,.grid .grownum{background:var(--bg-2);font-weight:700;color:var(--muted);text-align:center;position:sticky;left:0;z-index:1;font-family:var(--mono);font-size:.75rem}
.grid .ghead.gcorner{z-index:3}
.grid .gcell.numeric{text-align:right;font-variant-numeric:tabular-nums}
.grid .gcell.answer{background:var(--warn-bg);cursor:cell;font-weight:700;color:var(--ink);box-shadow:inset 0 0 0 1px var(--gold)}
.grid .gcell.answer.filled{background:var(--green-l);box-shadow:inset 0 0 0 1px var(--green)}
.grid .gcell.selected{box-shadow:inset 0 0 0 2px var(--green)!important;background:var(--green-l)}
.grid .gcell.headerlabel{font-weight:700;color:var(--ink);background:color-mix(in srgb,var(--green-l) 60%,transparent)}

.prac-actions{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap}
.prac-feedback{margin-top:14px;padding:16px 18px;border-radius:12px;font-size:.92rem}
.prac-feedback.good{background:var(--ok-bg);color:var(--green-d);border:1px solid transparent}
.prac-feedback.bad{background:var(--err-bg);color:var(--err)}
.prac-feedback.neutral{background:var(--bg-2);color:var(--ink-2)}
.prac-feedback code{background:rgba(0,0,0,.06)}
.prac-feedback .fb-title{font-weight:800;font-size:1rem;margin-bottom:4px;display:flex;align-items:center;gap:8px}

/* ---------------------------------------------------------------- quiz ----*/
.quizwrap{max-width:720px;margin:0 auto}
.quizhead{text-align:center;margin-bottom:22px}
.quizprog{display:flex;align-items:center;gap:12px;max-width:400px;margin:14px auto 0}
.qp-bar{flex:1;height:8px;background:var(--bg-2);border-radius:99px;overflow:hidden}
.qp-bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--green),#34d399);transition:width .4s;border-radius:99px}
.qp-txt{font-size:.8rem;font-weight:700;color:var(--muted)}
.qcard{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}
.qcount{font-size:.78rem;font-weight:700;color:var(--green-d);text-transform:uppercase;letter-spacing:.05em;margin-bottom:10px}
.qtext{font-size:1.12rem;font-weight:600;margin-bottom:18px;line-height:1.5}
.qopts{display:flex;flex-direction:column;gap:10px}
.opt{display:flex;align-items:center;gap:12px;padding:13px 15px;border:1.5px solid var(--line-2);border-radius:12px;cursor:pointer;transition:.14s}
.opt:hover{border-color:var(--green);background:var(--green-l)}
.opt input{display:none}
.opt-key{flex:0 0 auto;width:28px;height:28px;border-radius:8px;background:var(--bg-2);display:grid;place-items:center;font-weight:700;font-size:.85rem;color:var(--muted);transition:.14s}
.opt input:checked+.opt-key{background:var(--green);color:#fff}
.opt:has(input:checked){border-color:var(--green);background:var(--green-l)}
.opt-txt{flex:1;font-weight:500}
.opt.correct{border-color:var(--ok);background:var(--ok-bg)}
.opt.correct .opt-key{background:var(--ok);color:#fff}
.opt.wrong{border-color:var(--err);background:var(--err-bg)}
.opt.wrong .opt-key{background:var(--err);color:#fff}
.opt.locked{pointer-events:none}
.fillin{max-width:100%}
.qexplain{margin-top:16px;padding:12px 14px;border-radius:10px;background:var(--bg-2);font-size:.88rem;color:var(--ink-2)}
.qexplain.good{background:var(--ok-bg);color:var(--green-d)}
.qexplain.bad{background:var(--err-bg);color:var(--err)}
.qnav{display:flex;justify-content:space-between;gap:12px;margin-top:22px}
.quizresult{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:34px;text-align:center;box-shadow:var(--shadow)}
.qr-score{font-size:3rem;font-weight:800;line-height:1}
.qr-ring{width:130px;height:130px;border-radius:50%;margin:0 auto 16px;display:grid;place-items:center;background:conic-gradient(var(--green) calc(var(--p)*1%),var(--bg-2) 0)}
.qr-ring .in{width:104px;height:104px;background:var(--card);border-radius:50%;display:grid;place-items:center;flex-direction:column}

/* ------------------------------------------------------------ leaderboard -*/
.lbwrap{max-width:820px;margin:0 auto}
.lbhead{text-align:center;margin-bottom:24px}
.podium{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;align-items:end;margin-bottom:26px}
.pod{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px 14px;text-align:center;box-shadow:var(--shadow);display:flex;flex-direction:column;align-items:center;gap:4px}
.pod-1{transform:translateY(-14px);border-color:var(--gold);box-shadow:0 12px 30px -12px rgba(245,158,11,.5)}
.pod-ava{width:56px;height:56px;border-radius:50%;color:#fff;font-weight:800;font-size:1.4rem;display:grid;place-items:center}
.pod-medal{font-size:1.6rem;margin-top:-4px}
.pod-xp{font-weight:800;color:var(--green-d)}
.lbtable{width:100%;border-collapse:collapse;font-size:.9rem;min-width:560px}
.lbtable th{text-align:left;padding:12px 14px;font-size:.75rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);border-bottom:1px solid var(--line)}
.lbtable td{padding:12px 14px;border-bottom:1px solid var(--line)}
.lbtable tr.me{background:var(--green-l)}
.rankcell{font-weight:800;color:var(--muted);width:48px}
.lbuser{display:flex;align-items:center;gap:10px}
.lbava{width:32px;height:32px;border-radius:50%;color:#fff;font-weight:700;display:grid;place-items:center;font-size:.85rem}
.you{color:var(--green-d)}

/* --------------------------------------------------------------- profile --*/
.profwrap{max-width:960px;margin:0 auto}
.profcard{display:flex;gap:22px;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);margin-bottom:20px}
.prof-ava{width:84px;height:84px;border-radius:24px;color:#fff;font-weight:800;font-size:2.2rem;display:grid;place-items:center;flex:0 0 auto}
.prof-meta{flex:1}
.prof-badges{display:flex;gap:8px;margin:10px 0;flex-wrap:wrap}
.profgrid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.panel h3{font-size:1rem;margin-bottom:14px}
.progmods{display:flex;flex-direction:column;gap:10px}
.pmrow{display:flex;align-items:center;gap:10px;font-size:.85rem}
.pmic{width:24px;text-align:center}
.pmname{flex:0 0 auto;width:38%;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pmbar{flex:1;height:7px;background:var(--bg-2);border-radius:99px;overflow:hidden}
.pmbar i{display:block;height:100%;border-radius:99px;transition:width .6s}
.pmpct{font-size:.78rem;font-weight:700;color:var(--muted);width:38px;text-align:right}
.histlist{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}
.histlist li{display:flex;align-items:center;gap:10px;padding:8px 4px;border-bottom:1px solid var(--line);font-size:.86rem}
.histlist li:last-child{border-bottom:none}
.hl-t{flex:1;color:var(--ink-2)}
.histlist small{color:var(--muted-2);font-size:.74rem}
.xp-plus{font-weight:800;color:var(--green);min-width:38px}
.ok-dot,.no-dot{width:10px;height:10px;border-radius:50%;flex:0 0 auto}
.ok-dot{background:var(--ok)}.no-dot{background:var(--err)}
.profgrid .panel:first-child{grid-column:1/-1}

/* ------------------------------------------------------------ data explorer*/
.dexp-head{margin-bottom:18px}
.dexp-controls{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-bottom:12px}
.dexp-tabs{display:flex;gap:8px}
.dt{padding:.55em 1em;border-radius:10px;background:var(--card);border:1px solid var(--line);color:var(--ink-2);font-weight:600;font-size:.88rem}
.dt.on{background:var(--green);color:#fff;border-color:transparent}
.dt:hover{text-decoration:none}
.dexp-search{display:flex;gap:8px}
.dexp-search input{width:260px}
.dtable{width:100%;border-collapse:collapse;font-size:.84rem;min-width:640px}
.dtable th{background:var(--bg-2);text-align:left;padding:10px 12px;position:sticky;top:0;font-weight:700;color:var(--ink-2)}
.dtable td{padding:9px 12px;border-bottom:1px solid var(--line);white-space:nowrap;color:var(--ink-2)}
.dtable tr:hover td{background:var(--bg-2)}
.pager{display:flex;align-items:center;justify-content:center;gap:16px;margin-top:16px;font-size:.85rem;color:var(--muted)}

/* ---------------------------------------------------------------- toast ---*/
.toastbox{position:fixed;right:20px;bottom:calc(20px + env(safe-area-inset-bottom,0));z-index:200;display:flex;flex-direction:column;gap:10px}
.toast{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--green);border-radius:12px;padding:12px 16px;box-shadow:var(--shadow-lg);font-size:.9rem;font-weight:600;min-width:220px;animation:tin .3s ease;display:flex;align-items:center;gap:10px}
.toast.xp{border-left-color:var(--gold)}
.toast.bad{border-left-color:var(--err)}
@keyframes tin{from{transform:translateX(30px);opacity:0}to{transform:none;opacity:1}}
@keyframes pop{0%{transform:scale(.6);opacity:0}60%{transform:scale(1.15)}100%{transform:scale(1);opacity:1}}

/* --------------------------------------------------------- confetti dots --*/
.confetti{position:fixed;inset:0;pointer-events:none;z-index:300;overflow:hidden}
.confetti i{position:absolute;width:9px;height:9px;top:-12px;border-radius:2px;animation:fall linear forwards}
@keyframes fall{to{transform:translateY(105vh) rotate(540deg);opacity:1}}

/* ------------------------------------------------------------ responsive --*/
@media (max-width:900px){
  .modlayout{grid-template-columns:1fr}
  .modtoc{position:static;order:-1}
  .prac-grid{grid-template-columns:1fr}
  .prac-side{position:static}
  .prac-tabs{flex-direction:row;overflow-x:auto;padding-bottom:4px}
  .ptab{min-width:180px}
  .profgrid{grid-template-columns:1fr}
  .kpirow{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:720px){
  .mainnav{display:none}
  .navtoggle{display:block;order:5}
  .topbar.nav-open .mainnav{display:flex;position:absolute;top:100%;left:0;right:0;flex-direction:column;background:var(--card);padding:12px;border-bottom:1px solid var(--line)}
  .xpmini{display:none}
  .auth-wrap{grid-template-columns:1fr}
  .auth-visual{display:none}
  .hero{grid-template-columns:1fr}
  .hero-right{display:flex;justify-content:center}
  .kpirow{grid-template-columns:repeat(2,1fr)}
  .challist{grid-template-columns:1fr}
  .grid2{grid-template-columns:1fr}
  h1{font-size:1.45rem}
  .rmtags{flex-direction:row}
}
@media (max-width:420px){
  .kpirow{grid-template-columns:1fr 1fr}
  .podium{gap:8px}
  .pod{padding:14px 8px}
}