/* ============ CompTIA A+ LabSim — Stylesheet ============ */
:root{
  --c1:#2563eb; --c1-dark:#1d4ed8; --c2:#7c3aed; --c2-dark:#6d28d9;
  --ok:#16a34a; --warn:#d97706; --err:#dc2626; --info:#0891b2;
  --bg:#f1f5f9; --surface:#ffffff; --surface-2:#f8fafc; --border:#e2e8f0;
  --text:#0f172a; --text-2:#475569; --text-3:#94a3b8;
  --shadow:0 1px 3px rgba(15,23,42,.08),0 8px 24px rgba(15,23,42,.06);
  --shadow-lg:0 20px 50px rgba(15,23,42,.18);
  --radius:14px; --radius-sm:9px; --mono:'JetBrains Mono',ui-monospace,monospace;
  --term-bg:#0b1021; --term-text:#e2e8f0; --term-green:#4ade80; --term-cyan:#22d3ee;
}
[data-theme="dark"]{
  --bg:#0b1120; --surface:#111827; --surface-2:#0f172a; --border:#1f2937;
  --text:#e5e7eb; --text-2:#9ca3af; --text-3:#6b7280;
  --shadow:0 1px 3px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.35);
  --shadow-lg:0 20px 50px rgba(0,0,0,.55);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
h1,h2,h3,h4{line-height:1.2;font-weight:700}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:var(--text-3);border-radius:10px;opacity:.5}
::-webkit-scrollbar-track{background:transparent}

/* ---------- Topbar ---------- */
.topbar{position:sticky;top:0;z-index:40;height:60px;display:flex;align-items:center;justify-content:space-between;padding:0 16px;background:var(--surface);border-bottom:1px solid var(--border)}
.topbar-left,.topbar-right{display:flex;align-items:center;gap:12px}
.brand{display:flex;align-items:center;gap:10px;font-size:1.15rem}
.brand-logo{width:34px;height:34px;display:grid;place-items:center;border-radius:9px;background:linear-gradient(135deg,var(--c1),var(--c2));color:#fff;font-size:1rem}
.brand-text strong{font-weight:800}
.icon-btn{width:40px;height:40px;border-radius:10px;display:grid;place-items:center;color:var(--text-2);font-size:1.05rem;transition:.15s}
.icon-btn:hover{background:var(--surface-2);color:var(--text)}
.xp-pill{display:flex;align-items:center;gap:6px;font-weight:700;font-size:.85rem;padding:7px 13px;border-radius:999px;background:linear-gradient(135deg,#f59e0b22,#f59e0b11);color:var(--warn);border:1px solid #f59e0b44}

/* ---------- Layout ---------- */
.layout{display:flex;min-height:calc(100vh - 60px)}
.sidebar{width:248px;flex-shrink:0;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;justify-content:space-between;position:sticky;top:60px;height:calc(100vh - 60px);overflow-y:auto}
.side-nav{padding:14px 12px;display:flex;flex-direction:column;gap:3px}
.side-group-label{font-size:.68rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--text-3);padding:14px 12px 5px}
.side-link{display:flex;align-items:center;gap:12px;padding:10px 13px;border-radius:10px;color:var(--text-2);font-weight:600;font-size:.92rem;transition:.15s;text-align:left;width:100%}
.side-link i{width:20px;text-align:center;font-size:1rem}
.side-link:hover{background:var(--surface-2);color:var(--text)}
.side-link.active{background:linear-gradient(135deg,var(--c1),var(--c2));color:#fff;box-shadow:0 6px 16px rgba(37,99,235,.3)}
.side-foot{padding:14px;border-top:1px solid var(--border)}
.btn-ghost-sm{display:flex;align-items:center;gap:7px;font-size:.82rem;color:var(--text-3);font-weight:600}
.btn-ghost-sm:hover{color:var(--err)}
.sidebar-backdrop{display:none}
.content{flex:1;padding:28px 32px 60px;max-width:1200px;margin:0 auto;width:100%}

/* ---------- Generic ---------- */
.page-head{margin-bottom:24px}
.page-head h1{font-size:1.75rem;font-weight:800;display:flex;align-items:center;gap:12px}
.page-head p{color:var(--text-2);margin-top:6px;max-width:720px}
.chip{display:inline-flex;align-items:center;gap:6px;font-size:.72rem;font-weight:700;padding:4px 10px;border-radius:999px;letter-spacing:.02em}
.chip.c1{background:#2563eb1a;color:var(--c1)}
.chip.c2{background:#7c3aed1a;color:var(--c2)}
.chip.easy{background:#16a34a1a;color:var(--ok)}
.chip.med{background:#d976061a;color:var(--warn)}
.chip.hard{background:#dc26261a;color:var(--err)}

/* ---------- Dashboard ---------- */
.hero{position:relative;overflow:hidden;border-radius:20px;padding:36px;color:#fff;background:linear-gradient(130deg,#1e3a8a,#4f46e5 55%,#7c3aed);box-shadow:var(--shadow-lg);margin-bottom:28px}
.hero::after{content:"";position:absolute;right:-60px;top:-60px;width:260px;height:260px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.18),transparent 70%)}
.hero h1{font-size:2rem;font-weight:800;max-width:640px}
.hero p{margin-top:10px;max-width:600px;opacity:.92}
.hero-stats{display:flex;flex-wrap:wrap;gap:26px;margin-top:22px}
.hero-stat b{display:block;font-size:1.7rem;font-weight:800}
.hero-stat span{font-size:.82rem;opacity:.85}
.hero-cta{margin-top:24px;display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:9px;padding:12px 22px;border-radius:11px;font-weight:700;font-size:.92rem;transition:.18s}
.btn-primary{background:#fff;color:var(--c1)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(0,0,0,.25)}
.btn-outline{border:1.5px solid rgba(255,255,255,.6);color:#fff}
.btn-outline:hover{background:rgba(255,255,255,.14)}

.grid{display:grid;gap:18px}
.grid-stats{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}
.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.stat-card .ico{width:44px;height:44px;border-radius:11px;display:grid;place-items:center;font-size:1.2rem;color:#fff;margin-bottom:12px}
.stat-card h3{font-size:1.6rem;font-weight:800}
.stat-card span{color:var(--text-2);font-size:.85rem}

.section-title{display:flex;align-items:center;justify-content:space-between;margin:32px 0 16px}
.section-title h2{font-size:1.25rem;font-weight:800}

.domain-grid{grid-template-columns:repeat(auto-fill,minmax(270px,1fr))}
.domain-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);cursor:pointer;transition:.18s;position:relative;overflow:hidden}
.domain-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--c1)}
.domain-card .d-ico{width:48px;height:48px;border-radius:12px;display:grid;place-items:center;font-size:1.3rem;color:#fff;margin-bottom:14px}
.domain-card h3{font-size:1.05rem;margin-bottom:6px}
.domain-card p{color:var(--text-2);font-size:.85rem;min-height:38px}
.domain-card .d-meta{display:flex;align-items:center;justify-content:space-between;margin-top:14px;font-size:.78rem;color:var(--text-3)}
.progress-bar{height:7px;border-radius:999px;background:var(--border);overflow:hidden;margin-top:12px}
.progress-bar>i{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,var(--c1),var(--c2));transition:width .5s}

/* ---------- Lab list ---------- */
.lab-list{display:grid;gap:14px}
.lab-row{display:flex;align-items:center;gap:16px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow);transition:.15s;cursor:pointer}
.lab-row:hover{border-color:var(--c1);transform:translateX(3px)}
.lab-row .l-ico{width:46px;height:46px;flex-shrink:0;border-radius:11px;display:grid;place-items:center;font-size:1.15rem;color:#fff}
.lab-row .l-main{flex:1;min-width:0}
.lab-row .l-main h3{font-size:1rem;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.lab-row .l-main p{color:var(--text-2);font-size:.85rem;margin-top:3px}
.lab-row .l-tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}
.lab-row .l-status{flex-shrink:0;display:flex;flex-direction:column;align-items:flex-end;gap:6px}
.l-check{width:26px;height:26px;border-radius:50%;display:grid;place-items:center;font-size:.8rem;border:2px solid var(--border);color:var(--text-3)}
.l-check.done{background:var(--ok);border-color:var(--ok);color:#fff}
.lab-type-tag{font-size:.68rem;font-weight:700;padding:3px 8px;border-radius:6px;background:var(--surface-2);color:var(--text-2);border:1px solid var(--border)}

.filter-bar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:20px}
.filter-btn{padding:8px 15px;border-radius:999px;font-size:.84rem;font-weight:600;background:var(--surface);border:1px solid var(--border);color:var(--text-2);transition:.15s}
.filter-btn:hover{border-color:var(--c1)}
.filter-btn.active{background:var(--c1);color:#fff;border-color:var(--c1)}

/* ---------- Modal ---------- */
.modal-root{position:fixed;inset:0;z-index:100;display:none}
.modal-root.open{display:block}
.modal-backdrop{position:absolute;inset:0;background:rgba(2,6,23,.65);backdrop-filter:blur(3px)}
.modal-shell{position:absolute;inset:0;margin:auto;width:min(960px,96vw);height:min(92vh,900px);background:var(--surface);border-radius:18px;box-shadow:var(--shadow-lg);display:flex;flex-direction:column;overflow:hidden;animation:pop .22s ease}
@keyframes pop{from{opacity:0;transform:scale(.96)}to{opacity:1;transform:scale(1)}}
.modal-head{display:flex;align-items:center;justify-content:space-between;padding:16px 22px;border-bottom:1px solid var(--border);background:var(--surface-2)}
.modal-head-main{display:flex;align-items:center;gap:12px}
.modal-head-main h2{font-size:1.15rem}
.lab-badge{font-size:.68rem;font-weight:800;letter-spacing:.06em;padding:5px 10px;border-radius:7px;background:linear-gradient(135deg,var(--c1),var(--c2));color:#fff}
.modal-body{flex:1;overflow-y:auto;padding:24px}

/* ---------- Lab content ---------- */
.lab-intro{background:var(--surface-2);border:1px solid var(--border);border-left:4px solid var(--c1);border-radius:var(--radius-sm);padding:16px 18px;margin-bottom:22px}
.lab-intro h4{font-size:.95rem;margin-bottom:5px;display:flex;gap:8px;align-items:center}
.lab-intro p{color:var(--text-2);font-size:.9rem}
.lab-objectives{list-style:none;margin:10px 0 0;display:grid;gap:5px}
.lab-objectives li{font-size:.85rem;color:var(--text-2);display:flex;gap:8px;align-items:flex-start}
.lab-objectives li i{color:var(--ok);margin-top:3px}

.lab-section-h{font-size:1rem;font-weight:700;margin:22px 0 12px;display:flex;align-items:center;gap:9px;padding-bottom:8px;border-bottom:1px solid var(--border)}
.lab-section-h .num{width:24px;height:24px;border-radius:7px;background:var(--c1);color:#fff;display:grid;place-items:center;font-size:.78rem;font-weight:700}

/* Terminal */
.terminal{background:var(--term-bg);border-radius:12px;overflow:hidden;box-shadow:inset 0 0 0 1px rgba(255,255,255,.05);font-family:var(--mono)}
.term-bar{display:flex;align-items:center;gap:8px;padding:9px 14px;background:#161c33;border-bottom:1px solid rgba(255,255,255,.06)}
.term-dot{width:11px;height:11px;border-radius:50%}
.term-dot.r{background:#ff5f57}.term-dot.y{background:#febc2e}.term-dot.g{background:#28c840}
.term-title{margin-left:8px;font-size:.78rem;color:#94a3b8}
.term-screen{padding:14px 16px;min-height:300px;max-height:420px;overflow-y:auto;font-size:.84rem;color:var(--term-text)}
.term-line{white-space:pre-wrap;word-break:break-word;line-height:1.5}
.term-line .prompt{color:var(--term-green)}
.term-line .path{color:var(--term-cyan)}
.term-line.out{color:#cbd5e1}
.term-line.err{color:#fca5a5}
.term-line.ok{color:var(--term-green)}
.term-input-row{display:flex;align-items:center;padding:4px 16px 14px;background:var(--term-bg);font-family:var(--mono)}
.term-input-row .prompt{color:var(--term-green);white-space:nowrap}
.term-input{flex:1;background:transparent;border:none;outline:none;color:var(--term-text);font-family:var(--mono);font-size:.84rem;padding-left:8px}
.term-hint{margin-top:10px;font-size:.8rem;color:var(--text-3);display:flex;align-items:center;gap:7px}

/* Tasks checklist */
.task-list{display:grid;gap:10px;margin:14px 0}
.task-item{display:flex;align-items:center;gap:12px;padding:12px 14px;background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);transition:.2s}
.task-item.done{border-color:var(--ok);background:#16a34a0d}
.task-item .t-box{width:24px;height:24px;flex-shrink:0;border-radius:6px;border:2px solid var(--border);display:grid;place-items:center;color:transparent;transition:.2s}
.task-item.done .t-box{background:var(--ok);border-color:var(--ok);color:#fff}
.task-item .t-txt{font-size:.88rem}
.task-item.done .t-txt{color:var(--text-2)}

/* Steps */
.step{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:12px;overflow:hidden}
.step-head{display:flex;align-items:center;gap:12px;padding:14px 16px;cursor:pointer}
.step-head .s-num{width:28px;height:28px;border-radius:8px;background:var(--surface-2);border:1px solid var(--border);display:grid;place-items:center;font-weight:700;font-size:.85rem;flex-shrink:0}
.step.done .s-num{background:var(--ok);border-color:var(--ok);color:#fff}
.step-head h4{font-size:.93rem;flex:1}
.step-body{padding:0 16px 16px 56px;font-size:.88rem;color:var(--text-2);display:none}
.step.open .step-body{display:block}
.step-body code{background:var(--surface-2);padding:2px 6px;border-radius:5px;font-family:var(--mono);font-size:.84em;color:var(--c2)}
.step-body .cmd-block{background:var(--term-bg);color:var(--term-green);padding:10px 14px;border-radius:8px;font-family:var(--mono);font-size:.82rem;margin:8px 0;white-space:pre-wrap}

/* Drag drop */
.dnd-wrap{display:grid;grid-template-columns:1fr 1fr;gap:20px}
@media(max-width:640px){.dnd-wrap{grid-template-columns:1fr}}
.dnd-pool,.dnd-targets{display:grid;gap:10px}
.dnd-col-label{font-size:.8rem;font-weight:700;color:var(--text-2);margin-bottom:4px;text-transform:uppercase;letter-spacing:.04em}
.dnd-item{padding:12px 14px;background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius-sm);font-size:.86rem;font-weight:600;cursor:grab;display:flex;align-items:center;gap:10px;transition:.15s}
.dnd-item:hover{border-color:var(--c1)}
.dnd-item.dragging{opacity:.4}
.dnd-item .d-ic{color:var(--c1)}
.dnd-slot{min-height:54px;padding:10px 14px;background:var(--surface-2);border:2px dashed var(--border);border-radius:var(--radius-sm);display:flex;align-items:center;gap:10px;transition:.15s}
.dnd-slot.over{border-color:var(--c1);background:#2563eb10}
.dnd-slot.correct{border-style:solid;border-color:var(--ok);background:#16a34a0d}
.dnd-slot.wrong{border-style:solid;border-color:var(--err);background:#dc26260d}
.dnd-slot .slot-label{font-size:.82rem;color:var(--text-3);font-weight:600}

/* Quiz / MCQ */
.quiz-q{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:16px}
.quiz-q .q-num{font-size:.76rem;font-weight:700;color:var(--c1);letter-spacing:.05em}
.quiz-q h4{font-size:1rem;margin:6px 0 14px}
.quiz-opt{display:flex;align-items:center;gap:12px;padding:12px 14px;border:1.5px solid var(--border);border-radius:var(--radius-sm);margin-bottom:9px;cursor:pointer;transition:.14s;font-size:.9rem}
.quiz-opt:hover{border-color:var(--c1);background:var(--surface-2)}
.quiz-opt .o-key{width:26px;height:26px;border-radius:7px;background:var(--surface-2);border:1px solid var(--border);display:grid;place-items:center;font-weight:700;font-size:.8rem;flex-shrink:0}
.quiz-opt.selected{border-color:var(--c1);background:#2563eb0d}
.quiz-opt.correct{border-color:var(--ok);background:#16a34a12}
.quiz-opt.correct .o-key{background:var(--ok);color:#fff;border-color:var(--ok)}
.quiz-opt.incorrect{border-color:var(--err);background:#dc26260d}
.quiz-opt.incorrect .o-key{background:var(--err);color:#fff;border-color:var(--err)}
.quiz-opt.disabled{pointer-events:none}
.q-explain{margin-top:10px;padding:12px 14px;border-radius:var(--radius-sm);background:var(--surface-2);border-left:3px solid var(--info);font-size:.85rem;color:var(--text-2);display:none}
.q-explain.show{display:block}
.q-explain b{color:var(--text)}

/* Lab footer actions */
.lab-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;margin-top:26px;padding-top:20px;border-top:1px solid var(--border)}
.lab-score{font-weight:700;font-size:.95rem}
.btn-sm{padding:10px 18px;border-radius:10px;font-weight:700;font-size:.88rem;transition:.15s}
.btn-blue{background:var(--c1);color:#fff}.btn-blue:hover{background:var(--c1-dark)}
.btn-green{background:var(--ok);color:#fff}.btn-green:hover{filter:brightness(.93)}
.btn-grey{background:var(--surface-2);color:var(--text-2);border:1px solid var(--border)}.btn-grey:hover{color:var(--text)}

/* Scenario box */
.scenario{background:linear-gradient(135deg,#f59e0b12,#dc262608);border:1px solid #f59e0b33;border-radius:var(--radius-sm);padding:16px 18px;margin-bottom:20px}
.scenario h4{font-size:.9rem;color:var(--warn);display:flex;gap:8px;align-items:center;margin-bottom:6px}
.scenario p{font-size:.9rem;color:var(--text-2)}

/* result panel */
.result-panel{text-align:center;padding:30px 20px}
.result-panel .r-circle{width:120px;height:120px;border-radius:50%;margin:0 auto 18px;display:grid;place-items:center;font-size:2.2rem;font-weight:800;color:#fff}
.result-panel h3{font-size:1.4rem;margin-bottom:6px}
.result-panel p{color:var(--text-2)}

/* input field lab */
.fill-field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.fill-field label{font-size:.86rem;font-weight:600}
.fill-field .f-hint{font-size:.8rem;color:var(--text-3)}
.fill-input{padding:11px 14px;border:1.5px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);color:var(--text);font-family:var(--mono);font-size:.88rem}
.fill-input:focus{outline:none;border-color:var(--c1)}
.fill-input.ok{border-color:var(--ok);background:#16a34a0a}
.fill-input.bad{border-color:var(--err);background:#dc26260a}

/* progress page */
.prog-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.achv{display:flex;align-items:center;gap:14px;padding:14px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
.achv .a-ico{width:50px;height:50px;border-radius:12px;display:grid;place-items:center;font-size:1.3rem;flex-shrink:0}
.achv.locked{opacity:.45;filter:grayscale(.6)}
.achv h4{font-size:.92rem}.achv p{font-size:.78rem;color:var(--text-2)}

/* toast */
.toast-host{position:fixed;bottom:22px;right:22px;z-index:200;display:flex;flex-direction:column;gap:10px}
.toast{display:flex;align-items:center;gap:11px;padding:13px 18px;border-radius:12px;background:var(--surface);box-shadow:var(--shadow-lg);border:1px solid var(--border);font-size:.88rem;font-weight:600;animation:slideIn .25s;min-width:240px}
@keyframes slideIn{from{opacity:0;transform:translateX(40px)}to{opacity:1;transform:translateX(0)}}
.toast .t-ic{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;color:#fff;flex-shrink:0}
.toast.ok .t-ic{background:var(--ok)}.toast.err .t-ic{background:var(--err)}.toast.info .t-ic{background:var(--info)}.toast.xp .t-ic{background:var(--warn)}

/* about */
.about-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);margin-bottom:18px}
.about-card h3{margin-bottom:10px;font-size:1.1rem}
.about-card p,.about-card li{color:var(--text-2);font-size:.92rem}
.about-card ul{margin:10px 0 0 20px;display:grid;gap:6px}

.empty{text-align:center;padding:60px 20px;color:var(--text-3)}
.empty i{font-size:2.5rem;margin-bottom:14px;display:block}

/* ---------- Responsive ---------- */
@media(max-width:860px){
  .content{padding:20px 16px 50px}
  .sidebar{position:fixed;left:0;top:60px;z-index:45;transform:translateX(-100%);transition:transform .25s;box-shadow:var(--shadow-lg)}
  .sidebar.open{transform:translateX(0)}
  .sidebar-backdrop.show{display:block;position:fixed;inset:60px 0 0;background:rgba(2,6,23,.5);z-index:44}
  .hero{padding:26px 22px}
  .hero h1{font-size:1.5rem}
  .page-head h1{font-size:1.4rem}
}
@media(max-width:560px){
  .brand-text{font-size:1rem}
  .xp-pill{padding:6px 10px;font-size:.78rem}
  .hero-stats{gap:18px}
  .lab-row{flex-wrap:wrap}
  .modal-body{padding:16px}
}