/* ============================================================
   Silla Academy — Escola de Tecnologia
   Tema escuro, mobile-first, acessível.
   ============================================================ */
:root{
  --bg:#0b0f17;
  --bg-soft:#111827;
  --bg-card:#151d2b;
  --bg-elev:#1b2536;
  --line:#243149;
  --line-soft:#1c2740;
  --txt:#e8eef7;
  --txt-dim:#9fb0c6;
  --txt-mut:#6b7a92;
  --brand:#6366f1;
  --brand-2:#8b5cf6;
  --accent:#22d3ee;
  --ok:#22c55e;
  --warn:#f59e0b;
  --err:#ef4444;
  --gold:#fbbf24;
  --radius:16px;
  --radius-sm:10px;
  --shadow:0 10px 30px rgba(0,0,0,.35);
  --grad:linear-gradient(135deg,var(--brand),var(--brand-2));
  --grad-accent:linear-gradient(135deg,var(--accent),var(--brand));
  --mono:"SFMono-Regular",ui-monospace,"JetBrains Mono","Fira Code",Consolas,monospace;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:var(--sans);
  background:var(--bg);
  color:var(--txt);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
::selection{background:var(--brand);color:#fff}

/* ---------- Layout base ---------- */
.app{min-height:100vh;display:flex;flex-direction:column}
.container{width:100%;max-width:1120px;margin:0 auto;padding:0 18px}

/* ---------- Topbar ---------- */
.topbar{
  position:sticky;top:0;z-index:50;
  background:rgba(11,15,23,.85);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line-soft);
}
.topbar .container{display:flex;align-items:center;gap:14px;height:62px}
.brand{display:flex;align-items:center;gap:10px;cursor:pointer;font-weight:800;letter-spacing:.2px}
.brand .logo{
  width:34px;height:34px;border-radius:9px;background:var(--grad);
  display:grid;place-items:center;font-size:18px;box-shadow:0 4px 14px rgba(99,102,241,.5);
}
.brand b{font-size:18px}
.brand span{color:var(--txt-mut);font-weight:600;font-size:12px;display:block;margin-top:-4px}
.topbar-spacer{flex:1}
.xp-pill{
  display:flex;align-items:center;gap:8px;background:var(--bg-elev);
  border:1px solid var(--line);border-radius:999px;padding:6px 12px;font-size:13px;font-weight:700;
}
.xp-pill .lvl{background:var(--grad);color:#fff;border-radius:999px;padding:1px 9px;font-size:12px}
.btn-ghost{
  background:var(--bg-elev);border:1px solid var(--line);color:var(--txt);
  border-radius:10px;padding:8px 12px;font-size:13px;font-weight:600;cursor:pointer;
}
.btn-ghost:hover{border-color:var(--brand)}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:var(--grad);color:#fff;border:none;border-radius:12px;
  padding:13px 20px;font-size:15px;font-weight:700;cursor:pointer;
  box-shadow:0 6px 18px rgba(99,102,241,.35);transition:transform .12s,box-shadow .12s;
  min-height:48px;
}
.btn:hover{transform:translateY(-1px);box-shadow:0 10px 26px rgba(99,102,241,.5);text-decoration:none}
.btn:active{transform:translateY(0)}
.btn.secondary{background:var(--bg-elev);border:1px solid var(--line);color:var(--txt);box-shadow:none}
.btn.secondary:hover{border-color:var(--brand)}
.btn.success{background:linear-gradient(135deg,#16a34a,#22c55e);box-shadow:0 6px 18px rgba(34,197,94,.35)}
.btn.block{width:100%}
.btn.big{padding:16px 26px;font-size:16px}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}

/* ---------- Hero (home) ---------- */
.hero{padding:46px 0 24px;position:relative;overflow:hidden}
.hero:before{
  content:"";position:absolute;inset:-40% -20% auto;height:520px;
  background:radial-gradient(60% 60% at 30% 20%,rgba(99,102,241,.25),transparent 70%),
             radial-gradient(50% 50% at 80% 10%,rgba(34,211,238,.18),transparent 70%);
  filter:blur(10px);z-index:-1;
}
.hero h1{font-size:clamp(28px,6vw,46px);line-height:1.1;margin:0 0 14px;font-weight:900;letter-spacing:-.5px}
.hero h1 .grad{background:var(--grad-accent);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:clamp(15px,3.6vw,19px);color:var(--txt-dim);max-width:640px;margin:0 0 22px}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
.chip{background:var(--bg-elev);border:1px solid var(--line);border-radius:999px;padding:6px 13px;font-size:13px;color:var(--txt-dim);font-weight:600}

/* ---------- Section ---------- */
.section{padding:30px 0}
.section h2{font-size:clamp(20px,4.5vw,28px);margin:0 0 6px;font-weight:800}
.section .sub{color:var(--txt-dim);margin:0 0 20px}
.eyebrow{color:var(--accent);font-weight:800;font-size:12px;letter-spacing:1.5px;text-transform:uppercase;margin:0 0 8px}

/* ---------- Stat row ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:8px 0 4px}
.stat{background:var(--bg-card);border:1px solid var(--line-soft);border-radius:var(--radius-sm);padding:14px}
.stat .n{font-size:24px;font-weight:900}
.stat .l{font-size:12px;color:var(--txt-mut);font-weight:600}

/* ---------- Course grid ---------- */
.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.course-card{
  background:var(--bg-card);border:1px solid var(--line-soft);border-radius:var(--radius);
  padding:20px;cursor:pointer;transition:transform .14s,border-color .14s,box-shadow .14s;
  position:relative;overflow:hidden;display:flex;flex-direction:column;
}
.course-card:hover{transform:translateY(-3px);border-color:var(--cc,var(--brand));box-shadow:var(--shadow)}
.course-card .cc-top{display:flex;align-items:center;gap:12px;margin-bottom:10px}
.course-card .cc-emoji{
  width:52px;height:52px;border-radius:13px;display:grid;place-items:center;font-size:27px;
  background:color-mix(in srgb,var(--cc) 22%,transparent);border:1px solid color-mix(in srgb,var(--cc) 40%,transparent);
}
.course-card h3{margin:0;font-size:18px;font-weight:800}
.course-card .cc-sub{color:var(--txt-mut);font-size:12.5px;font-weight:600}
.course-card p{color:var(--txt-dim);font-size:14px;margin:2px 0 14px;flex:1}
.course-card .cc-meta{display:flex;gap:14px;color:var(--txt-mut);font-size:12.5px;font-weight:600;margin-bottom:12px}
.course-card .lockbadge{position:absolute;top:14px;right:14px;font-size:12px;color:var(--txt-mut)}
.badge-done{position:absolute;top:0;right:0;background:var(--ok);color:#04210f;font-weight:800;font-size:11px;padding:4px 12px;border-bottom-left-radius:10px}

/* progress bar */
.pbar{height:8px;background:var(--bg-elev);border-radius:999px;overflow:hidden}
.pbar>i{display:block;height:100%;background:var(--grad);border-radius:999px;transition:width .5s}
.pbar.accent>i{background:var(--grad-accent)}
.pmeta{display:flex;justify-content:space-between;font-size:12px;color:var(--txt-mut);margin-top:6px;font-weight:600}

/* ---------- Course detail / module list ---------- */
.crumbs{display:flex;align-items:center;gap:8px;color:var(--txt-mut);font-size:13px;font-weight:600;padding:16px 0;flex-wrap:wrap}
.crumbs a{color:var(--txt-dim)}
.crumbs .sep{opacity:.5}
.course-head{display:flex;gap:16px;align-items:flex-start;margin-bottom:6px}
.course-head .big-emoji{width:64px;height:64px;border-radius:16px;display:grid;place-items:center;font-size:34px;background:color-mix(in srgb,var(--cc) 22%,transparent);border:1px solid color-mix(in srgb,var(--cc) 40%,transparent);flex:0 0 auto}
.course-head h1{margin:0;font-size:clamp(24px,5vw,34px);font-weight:900}
.course-head p{margin:6px 0 0;color:var(--txt-dim)}

.module{background:var(--bg-card);border:1px solid var(--line-soft);border-radius:var(--radius);margin-bottom:14px;overflow:hidden}
.module-head{display:flex;align-items:center;gap:12px;padding:16px 18px;cursor:pointer;user-select:none}
.module-head .midx{width:30px;height:30px;border-radius:8px;background:var(--bg-elev);border:1px solid var(--line);display:grid;place-items:center;font-weight:800;font-size:13px;flex:0 0 auto}
.module-head h3{margin:0;font-size:16px;font-weight:800;flex:1}
.module-head .mprog{font-size:12px;color:var(--txt-mut);font-weight:700}
.module-head .caret{transition:transform .2s;color:var(--txt-mut)}
.module.open .caret{transform:rotate(90deg)}
.lesson-list{display:none;border-top:1px solid var(--line-soft)}
.module.open .lesson-list{display:block}
.lesson-row{display:flex;align-items:center;gap:12px;padding:13px 18px;cursor:pointer;border-bottom:1px solid var(--line-soft);transition:background .12s}
.lesson-row:last-child{border-bottom:none}
.lesson-row:hover{background:var(--bg-elev)}
.lesson-row .tick{width:24px;height:24px;border-radius:50%;border:2px solid var(--line);display:grid;place-items:center;font-size:13px;flex:0 0 auto;color:var(--txt-mut)}
.lesson-row.done .tick{background:var(--ok);border-color:var(--ok);color:#04210f}
.lesson-row .li-title{flex:1;font-size:14.5px;font-weight:600}
.lesson-row .li-dur{font-size:12px;color:var(--txt-mut);font-weight:600}
.lesson-row .li-type{font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.5px;padding:2px 7px;border-radius:6px;background:var(--bg-elev);color:var(--txt-dim);border:1px solid var(--line)}
.exam-row{background:linear-gradient(90deg,color-mix(in srgb,var(--gold) 10%,transparent),transparent)}

/* ---------- Lesson view ---------- */
.lesson-wrap{max-width:820px;margin:0 auto;padding-bottom:60px}
.lesson-progress-top{height:4px;background:var(--bg-elev);position:sticky;top:62px;z-index:20}
.lesson-progress-top>i{display:block;height:100%;background:var(--grad-accent)}
.lesson-content{padding-top:22px}
.lesson-content h1{font-size:clamp(24px,5vw,32px);font-weight:900;margin:0 0 4px;line-height:1.15}
.lesson-content .l-kicker{color:var(--accent);font-weight:800;font-size:12.5px;text-transform:uppercase;letter-spacing:1px;margin-bottom:8px}
.lesson-content h2{font-size:22px;font-weight:800;margin:30px 0 10px;padding-top:6px}
.lesson-content h3{font-size:17px;font-weight:800;margin:22px 0 8px;color:#fff}
.lesson-content p{margin:12px 0;color:var(--txt)}
.lesson-content ul,.lesson-content ol{margin:12px 0;padding-left:22px}
.lesson-content li{margin:7px 0}
.lesson-content strong{color:#fff}
.lesson-content code{font-family:var(--mono);background:var(--bg-elev);border:1px solid var(--line);border-radius:6px;padding:1px 6px;font-size:.9em;color:#a5f3fc}
.lesson-content pre{background:#0a0e16;border:1px solid var(--line);border-radius:12px;padding:16px;overflow-x:auto;margin:16px 0;position:relative}
.lesson-content pre code{background:none;border:none;padding:0;color:#d6e2f5;font-size:13.5px;line-height:1.7;display:block}
.lesson-content pre .cmt{color:#5f7290}
.lesson-content pre .kw{color:#c792ea}
.lesson-content pre .str{color:#addb67}
.lesson-content pre .num{color:#f78c6c}
.lesson-content pre .fn{color:#82aaff}
.copy-btn{position:absolute;top:8px;right:8px;background:var(--bg-elev);border:1px solid var(--line);color:var(--txt-dim);border-radius:7px;padding:4px 9px;font-size:11px;font-weight:700;cursor:pointer}
.copy-btn:hover{color:#fff;border-color:var(--brand)}

.callout{border-radius:12px;padding:14px 16px;margin:18px 0;border:1px solid var(--line);background:var(--bg-card);display:flex;gap:12px}
.callout .ic{font-size:20px;flex:0 0 auto}
.callout.tip{border-color:color-mix(in srgb,var(--accent) 45%,transparent);background:color-mix(in srgb,var(--accent) 8%,transparent)}
.callout.warn{border-color:color-mix(in srgb,var(--warn) 50%,transparent);background:color-mix(in srgb,var(--warn) 9%,transparent)}
.callout.danger{border-color:color-mix(in srgb,var(--err) 50%,transparent);background:color-mix(in srgb,var(--err) 9%,transparent)}
.callout.real{border-color:color-mix(in srgb,var(--brand) 55%,transparent);background:color-mix(in srgb,var(--brand) 10%,transparent)}
.callout b{color:#fff}
.callout p{margin:0}

.kbd{font-family:var(--mono);background:var(--bg-elev);border:1px solid var(--line);border-bottom-width:2px;border-radius:6px;padding:1px 7px;font-size:.85em;font-weight:700}

table.tbl{width:100%;border-collapse:collapse;margin:16px 0;font-size:14px;display:block;overflow-x:auto}
table.tbl th,table.tbl td{border:1px solid var(--line);padding:9px 12px;text-align:left}
table.tbl th{background:var(--bg-elev);font-weight:800}
table.tbl code{white-space:nowrap}

/* lesson nav */
.lesson-nav{display:flex;gap:12px;margin-top:34px;padding-top:22px;border-top:1px solid var(--line-soft)}
.lesson-nav .btn{flex:1}

/* ---------- Interactive: terminal ---------- */
.lab{margin:22px 0;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#0a0e16}
.lab-head{display:flex;align-items:center;gap:10px;padding:11px 14px;background:var(--bg-elev);border-bottom:1px solid var(--line)}
.lab-head .dots{display:flex;gap:6px}
.lab-head .dots i{width:11px;height:11px;border-radius:50%;display:block}
.lab-head .dots i:nth-child(1){background:#ff5f57}
.lab-head .dots i:nth-child(2){background:#febc2e}
.lab-head .dots i:nth-child(3){background:#28c840}
.lab-head .lab-title{font-size:12.5px;font-weight:700;color:var(--txt-dim);font-family:var(--mono)}
.lab-head .lab-tag{margin-left:auto;font-size:11px;font-weight:800;text-transform:uppercase;color:var(--accent)}
.term{font-family:var(--mono);font-size:13.5px;padding:14px;min-height:230px;max-height:360px;overflow-y:auto;color:#d6e2f5;line-height:1.55}
.term .out{white-space:pre-wrap;word-break:break-word}
.term .prompt{color:#22c55e;font-weight:700}
.term .path{color:#22d3ee}
.term .err{color:#f87171}
.term .line{display:flex}
.term-input-row{display:flex;align-items:center;font-family:var(--mono);font-size:13.5px;padding:0 14px 14px}
.term-input-row .ps{color:#22c55e;font-weight:700;white-space:nowrap;margin-right:8px}
.term-input-row input{flex:1;background:none;border:none;color:#d6e2f5;font-family:var(--mono);font-size:13.5px;outline:none}

.tasks{padding:14px;border-top:1px solid var(--line);background:var(--bg-card)}
.tasks .tk{display:flex;align-items:flex-start;gap:10px;font-size:13.5px;margin:7px 0;color:var(--txt-dim)}
.tasks .tk .box{width:20px;height:20px;border-radius:6px;border:2px solid var(--line);flex:0 0 auto;display:grid;place-items:center;font-size:12px;margin-top:1px}
.tasks .tk.done .box{background:var(--ok);border-color:var(--ok);color:#04210f}
.tasks .tk.done{color:var(--txt);text-decoration:none}
.tasks .tk.done .txt{opacity:.7}
.tasks-head{font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:1px;color:var(--txt-mut);margin-bottom:8px}
.tasks-done-msg{margin-top:12px;padding:12px;border-radius:10px;background:color-mix(in srgb,var(--ok) 14%,transparent);border:1px solid color-mix(in srgb,var(--ok) 45%,transparent);font-weight:700;color:#bbf7d0;display:none}
.tasks-done-msg.show{display:block}

/* ---------- Interactive: code editor (python / web) ---------- */
.editor-wrap{margin:22px 0;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.editor-tabs{display:flex;background:var(--bg-elev);border-bottom:1px solid var(--line)}
.editor-tabs .et{padding:10px 16px;font-size:12.5px;font-weight:700;color:var(--txt-mut);cursor:pointer;border-right:1px solid var(--line)}
.editor-tabs .et.active{color:#fff;background:#0a0e16}
.code-ta{width:100%;background:#0a0e16;color:#d6e2f5;font-family:var(--mono);font-size:13.5px;line-height:1.6;border:none;outline:none;padding:14px;resize:vertical;min-height:170px;display:block;tab-size:4}
.editor-bar{display:flex;align-items:center;gap:10px;padding:10px 14px;background:var(--bg-elev);border-top:1px solid var(--line)}
.editor-bar .status{font-size:12px;color:var(--txt-mut);font-weight:600;margin-left:auto}
.run-out{background:#070a10;border-top:1px solid var(--line);padding:14px;font-family:var(--mono);font-size:13px;color:#d6e2f5;white-space:pre-wrap;min-height:44px;max-height:280px;overflow:auto}
.run-out .ok{color:#4ade80}
.run-out .err{color:#f87171}
.run-out .muted{color:var(--txt-mut)}
.web-preview{background:#fff;border:none;width:100%;height:260px;display:block}
.spinner{width:16px;height:16px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;display:inline-block;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- Quiz ---------- */
.quiz{margin:26px 0;background:var(--bg-card);border:1px solid var(--line);border-radius:16px;padding:20px}
.quiz-head{display:flex;align-items:center;gap:10px;margin-bottom:4px}
.quiz-head .qic{font-size:22px}
.quiz-head h3{margin:0;font-size:18px;font-weight:800}
.quiz .qcount{color:var(--txt-mut);font-size:13px;font-weight:600;margin-bottom:16px}
.q-question{font-size:16px;font-weight:700;margin:0 0 14px}
.q-question code{font-size:.9em}
.q-opts{display:flex;flex-direction:column;gap:10px}
.q-opt{
  display:flex;align-items:center;gap:12px;padding:13px 15px;border:1.5px solid var(--line);
  border-radius:12px;cursor:pointer;font-size:14.5px;font-weight:600;transition:.12s;background:var(--bg-elev);
}
.q-opt:hover{border-color:var(--brand)}
.q-opt .mk{width:24px;height:24px;border-radius:50%;border:2px solid var(--line);flex:0 0 auto;display:grid;place-items:center;font-weight:800;font-size:12px;color:var(--txt-mut)}
.q-opt.correct{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 13%,transparent)}
.q-opt.correct .mk{background:var(--ok);border-color:var(--ok);color:#04210f}
.q-opt.wrong{border-color:var(--err);background:color-mix(in srgb,var(--err) 13%,transparent)}
.q-opt.wrong .mk{background:var(--err);border-color:var(--err);color:#fff}
.q-opt.disabled{pointer-events:none;opacity:.85}
.q-explain{margin-top:14px;padding:13px 15px;border-radius:11px;background:var(--bg-elev);border:1px solid var(--line);font-size:14px;display:none}
.q-explain.show{display:block}
.q-explain b{color:var(--accent)}
.quiz-nav{display:flex;gap:10px;margin-top:18px;align-items:center}
.quiz-score{font-weight:800;margin-left:auto}

/* ---------- Exam ---------- */
.exam-intro{max-width:640px;margin:20px auto;text-align:center}
.exam-intro .big{font-size:60px;margin-bottom:6px}
.exam-card{max-width:720px;margin:0 auto}
.exam-timer{position:sticky;top:70px;z-index:10;background:var(--bg-elev);border:1px solid var(--line);border-radius:999px;padding:8px 16px;font-weight:800;font-family:var(--mono);display:inline-flex;gap:8px;align-items:center}

/* ---------- Certificate ---------- */
.cert{max-width:820px;margin:22px auto;background:linear-gradient(135deg,#12182a,#0d1220);border:2px solid var(--gold);border-radius:20px;padding:36px 30px;text-align:center;position:relative;box-shadow:0 20px 60px rgba(0,0,0,.5)}
.cert:before{content:"";position:absolute;inset:10px;border:1px solid color-mix(in srgb,var(--gold) 40%,transparent);border-radius:14px;pointer-events:none}
.cert .seal{font-size:52px}
.cert .ct-kick{color:var(--gold);letter-spacing:3px;text-transform:uppercase;font-size:12px;font-weight:800;margin:6px 0}
.cert h1{font-size:clamp(24px,5vw,34px);margin:8px 0;font-weight:900}
.cert .ct-name{font-size:clamp(22px,5vw,30px);font-weight:900;background:var(--grad-accent);-webkit-background-clip:text;background-clip:text;color:transparent;margin:14px 0}
.cert .ct-course{font-size:18px;font-weight:700;color:var(--txt-dim)}
.cert .ct-foot{display:flex;justify-content:space-around;margin-top:26px;flex-wrap:wrap;gap:14px}
.cert .ct-foot div{font-size:13px;color:var(--txt-mut)}
.cert .ct-foot b{display:block;color:var(--txt);font-size:15px}

/* ---------- Dashboard ---------- */
.dash-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:16px}
.panel{background:var(--bg-card);border:1px solid var(--line-soft);border-radius:var(--radius);padding:20px}
.panel h3{margin:0 0 14px;font-size:16px;font-weight:800}
.badges{display:flex;flex-wrap:wrap;gap:12px}
.badge{width:74px;text-align:center}
.badge .b-ic{width:60px;height:60px;margin:0 auto 6px;border-radius:16px;display:grid;place-items:center;font-size:28px;background:var(--bg-elev);border:1px solid var(--line);filter:grayscale(1);opacity:.4}
.badge.earned .b-ic{filter:none;opacity:1;background:color-mix(in srgb,var(--gold) 15%,transparent);border-color:var(--gold);box-shadow:0 0 20px color-mix(in srgb,var(--gold) 30%,transparent)}
.badge .b-l{font-size:11px;color:var(--txt-mut);font-weight:700}
.streak{display:flex;align-items:center;gap:14px}
.streak .fire{font-size:40px}
.streak .s-n{font-size:34px;font-weight:900}
.continue-card{display:flex;align-items:center;gap:14px;background:var(--bg-elev);border:1px solid var(--line);border-radius:14px;padding:14px;cursor:pointer;margin-bottom:12px}
.continue-card:hover{border-color:var(--brand)}
.continue-card .cc-ic{font-size:30px}
.continue-card .cc-t{flex:1}
.continue-card .cc-t b{display:block}
.continue-card .cc-t span{font-size:13px;color:var(--txt-mut)}

/* ---------- Toast ---------- */
.toast-wrap{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);z-index:200;display:flex;flex-direction:column;gap:8px;align-items:center;pointer-events:none}
.toast{background:var(--bg-elev);border:1px solid var(--line);border-left:4px solid var(--brand);border-radius:12px;padding:12px 18px;font-weight:700;box-shadow:var(--shadow);animation:toastin .3s;max-width:90vw}
.toast.xp{border-left-color:var(--gold)}
.toast.ok{border-left-color:var(--ok)}
@keyframes toastin{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}

/* confetti */
.confetti{position:fixed;inset:0;pointer-events:none;z-index:300;overflow:hidden}
.confetti i{position:absolute;width:9px;height:14px;top:-20px;animation:fall linear forwards}
@keyframes fall{to{transform:translateY(105vh) rotate(540deg)}}

/* ---------- Footer ---------- */
.foot{margin-top:auto;border-top:1px solid var(--line-soft);padding:26px 0;color:var(--txt-mut);font-size:13px}
.foot .container{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* ---------- Mobile ---------- */
@media(max-width:760px){
  .stats{grid-template-columns:repeat(2,1fr)}
  .dash-grid{grid-template-columns:1fr}
  .topbar .container{gap:8px}
  .brand span{display:none}
  .xp-pill{padding:5px 10px;font-size:12px}
  .hero{padding:32px 0 12px}
  .lesson-nav{flex-direction:column}
  .btn-ghost{padding:7px 10px}
}
@media(max-width:420px){
  .xp-pill .xp-txt{display:none}
}

/* util */
.hidden{display:none!important}
.center{text-align:center}
.mt{margin-top:16px}.mt2{margin-top:28px}
.spin-inline{display:inline-flex;gap:8px;align-items:center;color:var(--txt-dim)}