/* Docker Dojo — theme & layout */
:root {
  --docker-blue: #2496ED;
  --docker-blue-2: #0db7ed;
  --bg: #0a0f1a;
  --bg-2: #0e1626;
  --panel: #111c2e;
  --panel-2: #16233a;
  --border: #1e2f4a;
  --border-2: #26395a;
  --text: #e6edf6;
  --muted: #93a4bd;
  --dim: #64789a;
  --green: #34d399;
  --red: #f87171;
  --accent: #38bdf8;
  --radius: 14px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: var(--sans);
  color: var(--text);
  background: radial-gradient(1200px 700px at 80% -10%, rgba(36,150,237,.12), transparent 60%),
              radial-gradient(900px 600px at -10% 110%, rgba(13,183,237,.08), transparent 55%),
              var(--bg);
  display: grid;
  grid-template-columns: 300px 1fr;
  grid-template-rows: 60px 1fr;
  grid-template-areas: "brand header" "nav main";
  height: 100vh;
  overflow: hidden;
}
body.nav-collapsed { grid-template-columns: 0 1fr; }
body.nav-collapsed #sidebar, body.nav-collapsed #brand { display: none; }

/* ---------- brand / header ---------- */
#brand {
  grid-area: brand;
  display: flex; align-items: center; gap: 10px;
  padding: 0 18px;
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
  background: rgba(10,15,26,.6);
}
.logo-whale {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--docker-blue), var(--docker-blue-2));
  display: grid; place-items: center; font-size: 19px;
  box-shadow: 0 4px 14px rgba(36,150,237,.4);
}
.brand-name { font-weight: 700; letter-spacing: .2px; }
.brand-name small { display: block; font-weight: 500; font-size: 11px; color: var(--muted); letter-spacing: .3px; }

#header {
  grid-area: header;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 20px;
  border-bottom: 1px solid var(--border);
  background: rgba(10,15,26,.55);
  backdrop-filter: blur(8px);
}
.header-left { display: flex; align-items: center; gap: 14px; }
#sidebar-toggle {
  background: var(--panel); border: 1px solid var(--border); color: var(--muted);
  width: 34px; height: 34px; border-radius: 9px; cursor: pointer; font-size: 15px;
}
#sidebar-toggle:hover { color: var(--text); border-color: var(--border-2); }
.header-tag { font-size: 13px; color: var(--muted); }
.header-tag b { color: var(--text); }
.header-right { display: flex; align-items: center; gap: 18px; }
.progress-wrap { display: flex; align-items: center; gap: 10px; }
#progress-label { font-size: 12px; color: var(--muted); }
.ring { position: relative; width: 40px; height: 40px; }
.ring svg { transform: rotate(-90deg); }
#ring-bg { stroke: var(--border-2); }
#ring-fg { stroke: var(--docker-blue); transition: stroke-dashoffset .6s ease; stroke-linecap: round; }
#ring-pct { position: absolute; inset: 0; display: grid; place-items: center; font-size: 10px; font-weight: 700; }
.header-btn {
  background: var(--panel); border: 1px solid var(--border); color: var(--muted);
  padding: 7px 12px; border-radius: 9px; cursor: pointer; font-size: 12px;
}
.header-btn:hover { color: var(--text); border-color: var(--border-2); }

/* ---------- sidebar ---------- */
#sidebar {
  grid-area: nav;
  border-right: 1px solid var(--border);
  background: rgba(14,22,38,.5);
  overflow-y: auto;
  padding: 14px 12px 30px;
}
.nav-module {
  font-size: 11px; text-transform: uppercase; letter-spacing: .9px;
  color: var(--muted); font-weight: 700;
  padding: 16px 10px 8px;
}
.nav-lesson {
  display: flex; align-items: center; gap: 10px; width: 100%;
  background: transparent; border: 1px solid transparent; color: var(--muted);
  text-align: left; padding: 9px 10px; border-radius: 10px; cursor: pointer;
  font-size: 13.5px; font-family: inherit; margin-bottom: 2px; transition: .15s;
}
.nav-lesson:hover { background: var(--panel); color: var(--text); }
.nav-lesson.active { background: linear-gradient(90deg, rgba(36,150,237,.18), rgba(36,150,237,.04)); color: #fff; border-color: rgba(36,150,237,.35); }
.nav-dot {
  width: 18px; height: 18px; border-radius: 50%; flex: none;
  border: 1.5px solid var(--border-2); display: grid; place-items: center;
  font-size: 10px; color: var(--bg);
}
.nav-lesson.done .nav-dot { background: var(--green); border-color: var(--green); color: #05271b; font-weight: 800; }
.nav-lesson.active .nav-dot { border-color: var(--docker-blue); }
.nav-label { flex: 1; }

/* ---------- main ---------- */
#main {
  grid-area: main;
  display: grid;
  grid-template-columns: minmax(360px, 1fr) minmax(420px, 1.15fr);
  overflow: hidden;
}

/* lesson panel */
#lesson {
  overflow-y: auto;
  padding: 30px 34px 60px;
  border-right: 1px solid var(--border);
}
.lesson-kicker { color: var(--accent); font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; }
.lesson-title { font-size: 27px; margin: 6px 0 6px; letter-spacing: -.4px; }
.lesson-sub { color: var(--muted); font-size: 15px; margin: 0 0 20px; }
.lesson-intro { font-size: 14.5px; line-height: 1.65; color: #cdd8e8; background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px; }
.lesson-intro code, .step-text code, .concept-term { font-family: var(--mono); }
.lesson-intro code { background: var(--bg-2); padding: 1px 6px; border-radius: 5px; color: var(--accent); font-size: 12.5px; }
pre.code { font-family: var(--mono); background: #060b14; border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; margin: 12px 0 2px; font-size: 12.5px; line-height: 1.6; color: #9fd0f5; overflow-x: auto; }

.concept-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 16px 0; }
.concept { background: var(--panel-2); border: 1px solid var(--border); border-radius: 11px; padding: 11px 13px; }
.concept-term { display: inline-block; color: var(--docker-blue-2); font-size: 13px; font-weight: 700; margin-bottom: 3px; }
.concept-def { display: block; font-size: 12.5px; color: var(--muted); line-height: 1.45; }

.steps-head { font-size: 12px; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); font-weight: 700; margin: 26px 0 10px; }
.steps { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.step { display: flex; gap: 13px; padding: 14px 15px; border-radius: 12px; background: var(--panel); border: 1px solid var(--border); transition: .2s; }
.step.current { border-color: rgba(36,150,237,.55); box-shadow: 0 0 0 1px rgba(36,150,237,.25), 0 8px 24px -12px rgba(36,150,237,.5); background: linear-gradient(180deg, rgba(36,150,237,.08), transparent); }
.step.done { opacity: .72; }
.step-mark { flex: none; width: 24px; height: 24px; border-radius: 50%; display: grid; place-items: center; font-size: 12px; font-weight: 700; background: var(--bg-2); border: 1px solid var(--border-2); color: var(--muted); }
.step.current .step-mark { border-color: var(--docker-blue); color: var(--accent); }
.step.done .step-mark { background: var(--green); color: #05271b; border-color: var(--green); }
.step-body { flex: 1; }
.step-text { font-size: 14px; line-height: 1.55; color: #dce5f2; }
.step-text code { background: var(--bg-2); padding: 1px 6px; border-radius: 5px; color: var(--accent); font-size: 12.5px; }
.step-tools { display: flex; gap: 8px; margin-top: 9px; }
.hint-btn, .run-btn { font-family: inherit; font-size: 12px; padding: 5px 11px; border-radius: 8px; cursor: pointer; border: 1px solid var(--border-2); background: var(--bg-2); color: var(--muted); }
.hint-btn:hover, .run-btn:hover { color: var(--text); border-color: var(--docker-blue); }
.run-btn { color: var(--accent); }
.step-hint { margin-top: 9px; font-size: 12.5px; color: var(--green); background: rgba(52,211,153,.08); border: 1px solid rgba(52,211,153,.25); border-radius: 8px; padding: 8px 11px; font-family: var(--mono); }
.hidden { display: none; }

.complete-banner { margin-top: 20px; padding: 14px 16px; border-radius: 12px; background: linear-gradient(90deg, rgba(52,211,153,.15), transparent); border: 1px solid rgba(52,211,153,.4); font-size: 14px; }
.lesson-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 22px; }
.primary-btn, .ghost-btn { font-family: inherit; font-size: 13.5px; font-weight: 600; padding: 10px 18px; border-radius: 10px; cursor: pointer; }
.primary-btn { background: linear-gradient(135deg, var(--docker-blue), var(--docker-blue-2)); border: none; color: #fff; box-shadow: 0 6px 18px -6px rgba(36,150,237,.6); }
.primary-btn:disabled { opacity: .4; cursor: not-allowed; box-shadow: none; }
.ghost-btn { background: var(--panel); border: 1px solid var(--border-2); color: var(--muted); }
.ghost-btn:disabled { opacity: .35; cursor: not-allowed; }
.ghost-btn:not(:disabled):hover { color: var(--text); }

/* ---------- right column: terminal + dashboard ---------- */
#right { display: flex; flex-direction: column; overflow: hidden; min-width: 0; }
#term-wrap { flex: 1 1 auto; min-height: 0; }

/* ---------- terminal ---------- */
#term-wrap { display: flex; flex-direction: column; background: #060a12; overflow: hidden; position: relative; }
.term-bar { display: flex; align-items: center; gap: 8px; padding: 10px 14px; border-bottom: 1px solid var(--border); background: #0a1120; }
.term-dots { display: flex; gap: 6px; }
.term-dots i { width: 11px; height: 11px; border-radius: 50%; display: block; }
.term-dots i:nth-child(1){ background:#ff5f57; } .term-dots i:nth-child(2){ background:#febc2e; } .term-dots i:nth-child(3){ background:#28c840; }
.term-title { font-family: var(--mono); font-size: 12px; color: var(--muted); margin-left: 6px; }
.term-bar-actions { margin-left: auto; }
#reset-term { background: transparent; border: 1px solid var(--border-2); color: var(--muted); font-size: 11px; padding: 5px 10px; border-radius: 7px; cursor: pointer; font-family: inherit; }
#reset-term:hover { color: var(--text); border-color: var(--docker-blue); }

#term { flex: 1; overflow: hidden; display: flex; flex-direction: column; cursor: text; }
#term-scroll { flex: 1; overflow-y: auto; padding: 14px 16px; }
.term-line { font-family: var(--mono); font-size: 12.8px; line-height: 1.55; white-space: pre-wrap; word-break: break-word; color: #cdd8e8; }
.term-line.dim { color: var(--dim); }
.term-line.err { color: var(--red); }
.term-line.success { color: var(--green); font-weight: 600; }
.term-line.accent { color: var(--accent); }
.term-line.banner { color: var(--muted); border-left: 2px solid var(--docker-blue); padding-left: 10px; margin-bottom: 2px; }
.term-line.celebrate { color: #ffd166; font-weight: 600; }
.term-line.echo { color: #eaf2fb; margin-top: 3px; }
.p-user { color: var(--green); }
.p-path { color: var(--accent); margin: 0 2px; }
.p-sym { color: var(--docker-blue-2); margin-right: 4px; }

.term-input-row { display: flex; align-items: center; padding: 6px 16px 16px; font-family: var(--mono); font-size: 12.8px; }
#prompt { white-space: nowrap; }
#cmd { flex: 1; background: transparent; border: none; outline: none; color: #eaf2fb; font-family: var(--mono); font-size: 12.8px; margin-left: 6px; caret-color: var(--docker-blue-2); }
#cmd::placeholder { color: #3b4d6b; }

/* ---------- live dashboard ---------- */
#dash { flex: 0 0 44%; min-height: 120px; display: flex; flex-direction: column; background: var(--bg-2); border-top: 1px solid var(--border); overflow: hidden; }
body.dash-collapsed #dash { flex: 0 0 42px; min-height: 42px; }
body.dash-collapsed #dash-body { display: none; }
.dash-bar { display: flex; align-items: center; gap: 14px; padding: 10px 14px; border-bottom: 1px solid var(--border); background: #0c1524; flex: none; }
.dash-title { font-size: 12.5px; font-weight: 700; color: var(--text); letter-spacing: .3px; }
.dash-seg { display: inline-flex; background: var(--bg-2); border: 1px solid var(--border-2); border-radius: 8px; padding: 2px; }
.dash-seg .seg { background: transparent; border: none; color: var(--muted); font-size: 11.5px; font-family: inherit; padding: 4px 12px; border-radius: 6px; cursor: pointer; font-weight: 600; }
.dash-seg .seg.active { background: var(--docker-blue); color: #fff; }
.dash-seg .seg:not(.active):hover { color: var(--text); }
.dash-legend { display: flex; gap: 12px; margin-left: 4px; }
@media (max-width: 1200px) { .dash-legend { display: none; } }
.dash-legend .lg { font-size: 11px; color: var(--muted); display: flex; align-items: center; gap: 5px; }
#dash-toggle { margin-left: auto; background: transparent; border: 1px solid var(--border-2); color: var(--muted); width: 28px; height: 26px; border-radius: 7px; cursor: pointer; }
#dash-toggle:hover { color: var(--text); }
#dash-body { flex: 1; overflow-y: auto; padding: 12px 14px 18px; }

.dot { width: 9px; height: 9px; border-radius: 50%; display: inline-block; flex: none; }
.dot.run { background: var(--green); box-shadow: 0 0 8px rgba(52,211,153,.7); }
.dot.pause { background: #fbbf24; }
.dot.exit { background: #64748b; }

.dash-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 14px; }
.stat { background: var(--panel); border: 1px solid var(--border); border-radius: 11px; padding: 10px 12px; display: flex; flex-direction: column; position: relative; overflow: hidden; }
.stat::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; }
.stat.s-run::before { background: var(--docker-blue); } .stat.s-img::before { background: #a78bfa; }
.stat.s-net::before { background: #22d3ee; } .stat.s-vol::before { background: var(--green); }
.stat-n { font-size: 22px; font-weight: 800; line-height: 1; }
.stat-l { font-size: 11.5px; color: var(--text); margin-top: 3px; font-weight: 600; }
.stat-s { font-size: 10.5px; color: var(--muted); }

.dash-sec { margin-bottom: 14px; }
.dash-sec h5 { margin: 0 0 8px; font-size: 11px; text-transform: uppercase; letter-spacing: .8px; color: var(--muted); font-weight: 700; }
.dash-sec h5 small { text-transform: none; letter-spacing: 0; font-weight: 500; color: var(--dim); margin-left: 6px; }
.dash-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.dash-sec.half { margin-bottom: 12px; }
.dash-empty { font-size: 12.5px; color: var(--muted); background: var(--panel); border: 1px dashed var(--border-2); border-radius: 10px; padding: 12px 14px; }
.dash-empty.sm { padding: 7px 10px; font-size: 12px; }
.dash-empty code { font-family: var(--mono); color: var(--accent); font-size: 11.5px; }

.cbox-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 10px; }
.cbox { background: var(--panel); border: 1px solid var(--border); border-left: 3px solid #64748b; border-radius: 10px; padding: 9px 11px; transition: .2s; animation: cbox-in .25s ease; cursor: pointer; }
.cbox.run { border-left-color: var(--green); }
.cbox.pause { border-left-color: #fbbf24; }
.cbox:hover { border-color: var(--docker-blue); transform: translateY(-1px); box-shadow: 0 8px 20px -12px rgba(36,150,237,.7); }
.cbox:active { transform: translateY(0); }
.cbox-actions { display: flex; gap: 5px; margin-top: 9px; opacity: .55; transition: opacity .15s; }
.cbox:hover .cbox-actions { opacity: 1; }
.cba { flex: 1; background: var(--bg-2); border: 1px solid var(--border-2); border-radius: 6px; padding: 4px 0; font-size: 12px; cursor: pointer; line-height: 1; transition: .15s; }
.cba:hover { border-color: var(--docker-blue); background: var(--panel-2); transform: translateY(-1px); }
.cba.danger:hover { border-color: var(--red); }
.cbox-top { display: flex; align-items: center; gap: 6px; }
.cbox-top b { font-size: 13px; color: #fff; }
.cbox-id { margin-left: auto; font-family: var(--mono); font-size: 10px; color: var(--dim); }
.cbox-img { font-family: var(--mono); font-size: 11.5px; color: var(--accent); margin-top: 3px; }
.cbox-cmd { font-family: var(--mono); font-size: 10.5px; color: var(--muted); margin-top: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.cbox-tags { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 7px; }
.cbox-tag { font-size: 10px; font-family: var(--mono); padding: 2px 6px; border-radius: 5px; background: var(--bg-2); border: 1px solid var(--border-2); color: var(--muted); }
.cbox-tag.port { color: #7dd3fc; border-color: rgba(56,189,248,.35); }
.cbox-tag.net { color: #67e8f9; }
.cbox-tag.vol { color: #6ee7b7; }
@keyframes cbox-in { from { opacity: 0; transform: scale(.96); } to { opacity: 1; transform: scale(1); } }

.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { font-size: 11px; font-family: var(--mono); padding: 3px 8px; border-radius: 6px; background: var(--panel); border: 1px solid var(--border-2); color: var(--muted); }
.chip.net { color: #67e8f9; } .chip.vol { color: #6ee7b7; } .chip.img { color: #c4b5fd; }

/* ---------- topology diagram (SVG) ---------- */
.topo { display: block; }
.topo text { font-family: var(--sans); }
.topo-link { stroke: var(--border-2); stroke-width: 1.5; }
.topo-link.flow { stroke: var(--docker-blue); stroke-width: 1.8; stroke-dasharray: 3 7; animation: dash-flow .9s linear infinite; }
.topo-spine { stroke: rgba(34,211,238,.45); stroke-width: 2.5; stroke-linecap: round; }
.topo-spine.flow { stroke: rgba(34,211,238,.9); stroke-dasharray: 3 7; animation: dash-flow .9s linear infinite; }
.topo-packet { fill: #7dd3fc; filter: drop-shadow(0 0 3px rgba(56,189,248,.9)); }
@keyframes dash-flow { to { stroke-dashoffset: -20; } }
@keyframes dotpulse { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }
@media (prefers-reduced-motion: reduce) {
  .topo-link.flow, .topo-spine.flow { animation: none; }
  .topo-packet { display: none; }
}
.topo-hnode { fill: #0d1b30; stroke: var(--docker-blue); stroke-width: 1.5; }
.topo-hname { fill: #eaf2fb; font-size: 13px; font-weight: 700; }
.topo-hsub { fill: var(--muted); font-size: 10px; }
.topo-nnode { fill: #08131f; stroke: #22d3ee; stroke-width: 1.4; }
.topo-nname { fill: #a5f3fc; font-size: 12px; font-weight: 700; }
.topo-nsub { fill: #5f8aa8; font-size: 9.5px; }
.topo-cnode { fill: var(--panel); stroke: #64748b; stroke-width: 1.4; }
.topo-cnode.run { stroke: var(--green); }
.topo-cnode.pause { stroke: #fbbf24; }
.topo-cont:hover .topo-cnode { fill: var(--panel-2); stroke-width: 2.2; }
.topo-dot.run { fill: var(--green); animation: dotpulse 1.7s ease-in-out infinite; } .topo-dot.pause { fill: #fbbf24; } .topo-dot.exit { fill: #64748b; }
.topo-cname { fill: #fff; font-size: 12px; font-weight: 700; }
.topo-cimg { fill: var(--accent); font-size: 10.5px; font-family: var(--mono); }
.topo-cport { fill: #6ee7b7; font-size: 10px; font-family: var(--mono); }
.topo-cvol { fill: #93c5fd; font-size: 10px; font-family: var(--mono); }
.topo-more { fill: var(--muted); font-size: 10px; }
.topo-mlab { fill: var(--dim); font-size: 7.5px; font-family: var(--mono); letter-spacing: .3px; }
.topo-mval { fill: var(--muted); font-size: 8.5px; font-family: var(--mono); }
.topo-mtrack { fill: rgba(255,255,255,.09); }
.topo-mcpu { fill: var(--docker-blue); transition: width .85s linear; }
.topo-mmem { fill: #a78bfa; transition: width .85s linear; }
@media (prefers-reduced-motion: reduce) { .topo-mcpu, .topo-mmem { transition: none; } }

/* confetti */
#confetti { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.confetti-bit { position: absolute; top: -12px; width: 8px; height: 12px; border-radius: 2px; animation: fall 1.8s linear forwards; }
@keyframes fall { to { transform: translateY(110vh) rotate(540deg); opacity: 0; } }

/* sandbox nav item */
.nav-sandbox { margin-bottom: 8px; background: linear-gradient(90deg, rgba(56,189,248,.12), transparent); border: 1px solid rgba(56,189,248,.25); }
.nav-sandbox.active { border-color: rgba(56,189,248,.6); color: #fff; }
.nav-sandbox .nav-dot { border: none; background: transparent; font-size: 14px; }

/* dockerfile editor (sandbox) */
.editor-wrap { margin-top: 18px; }
.editor-head { font-size: 12px; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); font-weight: 700; margin-bottom: 8px; }
.editor { width: 100%; min-height: 150px; resize: vertical; background: #060b14; border: 1px solid var(--border-2); border-radius: 10px; padding: 12px 14px; color: #9fd0f5; font-family: var(--mono); font-size: 12.8px; line-height: 1.6; outline: none; margin-bottom: 10px; }
.editor:focus { border-color: var(--docker-blue); }

/* overlay modal */
#overlay { position: fixed; inset: 0; background: rgba(4,8,15,.7); backdrop-filter: blur(4px); display: grid; place-items: center; z-index: 50; padding: 24px; }
#overlay.hidden { display: none; }
.overlay-card { width: min(880px, 100%); max-height: 84vh; overflow-y: auto; background: var(--panel); border: 1px solid var(--border-2); border-radius: 16px; box-shadow: 0 30px 80px -20px rgba(0,0,0,.8); }
.overlay-bar { position: sticky; top: 0; display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; border-bottom: 1px solid var(--border); background: var(--panel); }
.overlay-bar h3 { margin: 0; font-size: 16px; }
#overlay-close { background: var(--bg-2); border: 1px solid var(--border-2); color: var(--muted); width: 30px; height: 30px; border-radius: 8px; cursor: pointer; }
#overlay-close:hover { color: var(--text); }
#overlay-body { padding: 20px; }

.cheat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; }
.cheat-col h4 { margin: 0 0 8px; font-size: 12px; text-transform: uppercase; letter-spacing: .8px; color: var(--accent); }
.cheat-col code { display: block; font-family: var(--mono); font-size: 12px; color: #cdd8e8; background: var(--bg-2); border: 1px solid var(--border); border-radius: 7px; padding: 6px 9px; margin-bottom: 6px; white-space: pre-wrap; }

.badge-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; }
.badge-card { text-align: center; padding: 18px 12px; border-radius: 12px; border: 1px solid var(--border); background: var(--panel-2); }
.badge-card.earned { border-color: rgba(52,211,153,.5); background: linear-gradient(180deg, rgba(52,211,153,.1), transparent); }
.badge-card.locked { opacity: .5; }
.badge-icon { font-size: 30px; display: block; margin-bottom: 8px; }
.badge-card b { display: block; font-size: 13px; margin-bottom: 3px; }
.badge-card small { color: var(--muted); font-size: 11.5px; }

/* welcome screen */
#brand { cursor: pointer; }
#welcome { position: fixed; inset: 0; z-index: 70; display: grid; place-items: center; padding: 24px;
  background: radial-gradient(900px 500px at 50% 0%, rgba(36,150,237,.22), transparent 60%), rgba(4,8,15,.86); backdrop-filter: blur(8px); }
#welcome.hidden { display: none; }
.welcome-card { width: min(680px, 100%); background: linear-gradient(180deg, var(--panel), var(--bg-2)); border: 1px solid var(--border-2); border-radius: 20px; padding: 34px 34px 22px; box-shadow: 0 40px 100px -30px rgba(0,0,0,.85); text-align: center; animation: welcome-in .35s ease; }
@keyframes welcome-in { from { opacity: 0; transform: translateY(14px) scale(.98); } to { opacity: 1; transform: none; } }
.welcome-whale { width: 64px; height: 64px; margin: 0 auto 14px; border-radius: 18px; display: grid; place-items: center; font-size: 34px; background: linear-gradient(135deg, var(--docker-blue), var(--docker-blue-2)); box-shadow: 0 10px 30px -8px rgba(36,150,237,.7); }
.welcome-hero h1 { margin: 0 0 8px; font-size: 26px; letter-spacing: -.5px; }
.welcome-hero p { margin: 0 auto; max-width: 460px; color: var(--muted); font-size: 14.5px; line-height: 1.6; }
.welcome-feats { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 24px 0 22px; text-align: left; }
.wf { background: var(--panel-2); border: 1px solid var(--border); border-radius: 12px; padding: 13px 15px; }
.wf span { font-size: 20px; display: block; margin-bottom: 6px; }
.wf b { font-size: 13.5px; display: block; margin-bottom: 2px; }
.wf small { color: var(--muted); font-size: 12px; line-height: 1.45; }
.welcome-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.welcome-actions .primary-btn, .welcome-actions .ghost-btn { padding: 11px 22px; font-size: 14px; }
.welcome-skip { margin-top: 14px; background: none; border: none; color: var(--dim); font-size: 12.5px; cursor: pointer; font-family: inherit; }
.welcome-skip:hover { color: var(--muted); }
@media (max-width: 560px) { .welcome-feats { grid-template-columns: 1fr; } }

/* toasts */
#toasts { position: fixed; right: 20px; bottom: 20px; display: flex; flex-direction: column; gap: 10px; z-index: 60; }
.toast { display: flex; align-items: center; gap: 12px; background: var(--panel); border: 1px solid rgba(52,211,153,.5); border-radius: 12px; padding: 12px 16px; box-shadow: 0 12px 32px -10px rgba(0,0,0,.7); transform: translateX(120%); opacity: 0; transition: .3s ease; max-width: 320px; }
.toast.show { transform: translateX(0); opacity: 1; }
.toast-icon { font-size: 26px; }
.toast b { font-size: 13px; display: block; }
.toast small { color: var(--muted); font-size: 12px; }

/* scrollbars */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 6px; }
::-webkit-scrollbar-thumb:hover { background: #33507d; }
::-webkit-scrollbar-track { background: transparent; }

@media (max-width: 980px) {
  body { grid-template-columns: 1fr; grid-template-areas: "header" "main"; grid-template-rows: 60px 1fr; }
  #brand, #sidebar { display: none; }
  #main { grid-template-columns: 1fr; grid-template-rows: 1fr 1fr; }
  #lesson { border-right: none; border-bottom: 1px solid var(--border); }
}