/* PacketLab — style */
:root {
  --bg: #040607;
  --bg2: #070a0b;
  --panel: #0a0e0f;
  --panel2: #0f1517;
  --border: #16241c;
  --border2: #22382b;
  --text: #d3f5e2;
  --muted: #6b8c79;
  --accent: #00ff88;
  --accent2: #ff2e4d;
  --accent-soft: rgba(0, 255, 136, .08);
  --good: #00e676;
  --bad: #ff2e4d;
  --warn: #ffb020;
  --sel: #00ff88;
  --sel-text: #00140a;
  --hl: #ff2e4d;
  --hl-text: #fff;
  --code-bg: #020404;
  --shadow: 0 0 0 1px rgba(0, 255, 136, .06), 0 14px 44px rgba(0, 0, 0, .7);
  --glow: 0 0 22px rgba(0, 255, 136, .35);
  --scan: .05;
  --grid: rgba(0, 255, 136, .035);
  --corner: var(--accent);
  --mono: 'JetBrains Mono', ui-monospace, 'Cascadia Code', Consolas, monospace;
  --sans: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  /* kolory pakietów — wersja ciemna */
  --c-http-bg: #1c3523; --c-http-fg: #c9f5cf;
  --c-tcp-bg: #262341; --c-tcp-fg: #dcd9ff;
  --c-synfin-bg: #33373e; --c-synfin-fg: #e6e8ec;
  --c-rst-bg: #6b0f0f; --c-rst-fg: #fff59d;
  --c-ttl-bg: #7a1414; --c-ttl-fg: #ffffff;
  --c-udp-bg: #142c45; --c-udp-fg: #cfe8ff;
  --c-arp-bg: #3b3218; --c-arp-fg: #fbefc9;
  --c-icmp-bg: #3d1e3d; --c-icmp-fg: #fbd9fb;
  --c-icmperr-bg: #0d0d0d; --c-icmperr-fg: #b7f774;
  --c-bcast-bg: #1a1f27; --c-bcast-fg: #9aa3ad;
  color-scheme: dark;
}
:root[data-theme="light"] {
  --bg: #f4f7fb;
  --bg2: #eef2f8;
  --panel: #ffffff;
  --panel2: #f3f6fa;
  --border: #dbe3ee;
  --border2: #c8d3e2;
  --text: #142033;
  --muted: #5b6b82;
  --accent: #0284c7;
  --accent2: #0d9488;
  --accent-soft: rgba(2, 132, 199, .10);
  --good: #059669;
  --bad: #dc2626;
  --warn: #b45309;
  --sel: #2563eb;
  --sel-text: #fff;
  --hl: #f59e0b;
  --hl-text: #1b1200;
  --code-bg: #f1f5fa;
  --shadow: 0 10px 40px rgba(20, 32, 51, .15);
  --glow: none;
  --scan: 0;
  --grid: transparent;
  --corner: transparent;
  /* oryginalna paleta Wiresharka */
  --c-http-bg: #e4ffc7; --c-http-fg: #12272e;
  --c-tcp-bg: #e7e6ff; --c-tcp-fg: #12272e;
  --c-synfin-bg: #a0a0a0; --c-synfin-fg: #12272e;
  --c-rst-bg: #a40000; --c-rst-fg: #fffc9c;
  --c-ttl-bg: #a40000; --c-ttl-fg: #fffffc;
  --c-udp-bg: #daeeff; --c-udp-fg: #12272e;
  --c-arp-bg: #faf0d7; --c-arp-fg: #12272e;
  --c-icmp-bg: #fce0ff; --c-icmp-fg: #12272e;
  --c-icmperr-bg: #12272e; --c-icmperr-fg: #b7f774;
  --c-bcast-bg: #ffffff; --c-bcast-fg: #babdb6;
  color-scheme: light;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--text); font: 15px/1.6 var(--sans); -webkit-font-smoothing: antialiased; font-variant-ligatures: none; }
a { color: var(--accent); text-decoration: none; }
code, kbd, pre { font-family: var(--mono); }
code { font-size: .88em; background: var(--accent-soft); color: var(--text); padding: .1em .38em; border-radius: 5px; }
kbd { font-size: .8em; padding: .1em .45em; border: 1px solid var(--border2); border-bottom-width: 2px; border-radius: 5px; background: var(--panel2); }
h1, h2, h3 { line-height: 1.25; letter-spacing: -.01em; }
.small { font-size: .86em; }
.muted { color: var(--muted); }
.ok { color: var(--good); }
button { font: inherit; color: inherit; }
::selection { background: var(--accent); color: #fff; }

/* ---------- nagłówek ---------- */
.top { position: sticky; top: 0; z-index: 50; height: 58px; display: flex; align-items: center; gap: 28px; padding: 0 20px; background: color-mix(in srgb, var(--bg) 85%, transparent); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.logo { display: flex; align-items: center; gap: 9px; color: var(--text); font-weight: 600; font-size: 18px; letter-spacing: -.02em; }
.logo svg { width: 30px; height: 30px; }
.logo b { background: linear-gradient(90deg, var(--accent), var(--accent2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.nav { display: flex; gap: 4px; }
.nav a { color: var(--muted); padding: 7px 13px; border-radius: 8px; font-weight: 500; font-size: 14.5px; transition: .15s; }
.nav a:hover { color: var(--text); background: var(--panel2); }
.nav a.active { color: var(--text); background: var(--accent-soft); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 35%, transparent); }
.top-r { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.xp { display: flex; align-items: center; gap: 8px; padding: 4px 6px 4px 12px; border: 1px solid var(--border); border-radius: 999px; font-size: 13px; }
.xp-num { font-weight: 700; color: var(--accent); }
.xp-rank { background: var(--panel2); padding: 2px 10px; border-radius: 999px; color: var(--muted); }
.seg { display: flex; border: 1px solid var(--border); border-radius: 9px; padding: 2px; gap: 2px; background: var(--panel); }
.seg button { border: 0; background: transparent; color: var(--muted); padding: 5px 10px; border-radius: 7px; cursor: pointer; font-size: 12.5px; white-space: nowrap; }
.seg button:hover { color: var(--text); }
.seg button.on { background: var(--accent-soft); color: var(--accent); font-weight: 600; box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 40%, transparent); }
.rt .seg, .rt .seg button { border-radius: 2px; font-family: var(--mono); text-transform: uppercase; letter-spacing: .04em; font-size: 11.5px; }
.icon-btn { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 9px; border: 1px solid var(--border); background: var(--panel); cursor: pointer; font-size: 16px; }
.icon-btn:hover { border-color: var(--accent); }

/* ---------- przyciski ---------- */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 10px 18px; border-radius: 10px; font-weight: 600; font-size: 14.5px; border: 1px solid transparent; cursor: pointer; transition: transform .1s, box-shadow .15s, background .15s; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #04121c; box-shadow: 0 6px 20px color-mix(in srgb, var(--accent) 30%, transparent); }
.btn-primary:hover { box-shadow: 0 8px 26px color-mix(in srgb, var(--accent) 45%, transparent); }
.btn-ghost { background: var(--panel); border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); }
.btn-sm { padding: 6px 12px; font-size: 13px; border-radius: 8px; }
.link { background: none; border: 0; color: var(--accent); cursor: pointer; padding: 0; text-decoration: underline; }

/* ---------- strona główna ---------- */
main { min-height: calc(100vh - 58px); }
body:not([data-view="lab"]) main { max-width: 1180px; margin: 0 auto; padding: 32px 24px 64px; }
.hero { display: grid; grid-template-columns: 1.15fr 1fr; gap: 40px; align-items: center; padding: 28px 0 36px; }
.eyebrow { display: inline-block; font-size: 12.5px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--accent2); margin-bottom: 14px; }
.hero h1 { font-size: clamp(32px, 4.4vw, 50px); margin: 0 0 16px; font-weight: 800; letter-spacing: -.03em; }
.grad { background: linear-gradient(90deg, var(--accent), var(--accent2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { color: var(--muted); font-size: 17px; max-width: 560px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }
.hero-art { background: radial-gradient(circle at 30% 20%, var(--accent-soft), transparent 60%), var(--panel); border: 1px solid var(--border); border-radius: 20px; padding: 18px; box-shadow: var(--shadow); }
.hero-svg { width: 100%; display: block; font-family: var(--mono); font-size: 13px; }
.hero-svg text { fill: var(--text); }
.hero-svg .hm { fill: var(--muted); font-size: 11.5px; }
.hx { stroke-width: 1.5; opacity: 0; animation: slideIn .6s forwards; }
.hx-1 { fill: var(--c-arp-bg); stroke: color-mix(in srgb, var(--warn) 50%, transparent); animation-delay: .1s; }
.hx-2 { fill: var(--c-udp-bg); stroke: color-mix(in srgb, var(--accent) 50%, transparent); animation-delay: .35s; }
.hx-3 { fill: var(--c-tcp-bg); stroke: #8b7cf6; animation-delay: .6s; }
.hx-4 { fill: var(--c-http-bg); stroke: var(--good); animation-delay: .85s; }
.hs-layers text { opacity: 0; animation: fadeIn .5s forwards 1s; }
.hs-hex text { fill: var(--accent); font-size: 12px; opacity: .3; animation: blink 2.4s infinite; }
.hs-hex text:nth-child(odd) { animation-delay: .6s; }
@keyframes slideIn { from { opacity: 0; transform: translateX(-14px); } to { opacity: 1; transform: none; } }
@keyframes fadeIn { to { opacity: 1; } }
@keyframes blink { 50% { opacity: 1; } }

.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 36px; }
.stat { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 16px 18px; display: flex; flex-direction: column; gap: 6px; }
.stat-k { font-size: 12.5px; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; font-weight: 600; }
.stat-v { font-size: 22px; font-weight: 700; }
.stat-s { font-size: 12.5px; color: var(--muted); }
.bar { height: 6px; background: var(--panel2); border-radius: 99px; overflow: hidden; }
.bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent2)); border-radius: 99px; transition: width .5s; }
.sec-title { font-size: 22px; margin: 8px 0 16px; }
.path { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 10px; margin-bottom: 40px; }
.path-item { display: grid; grid-template-columns: 30px 26px 1fr auto; align-items: center; gap: 8px; padding: 12px 14px; background: var(--panel); border: 1px solid var(--border); border-radius: 12px; color: var(--text); transition: .15s; }
.path-item:hover { border-color: var(--accent); transform: translateY(-1px); }
.pi-num { width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; font-size: 12.5px; font-weight: 700; background: var(--panel2); color: var(--muted); }
.path-item.done .pi-num { background: var(--good); color: #04120c; }
.pi-t { font-weight: 500; font-size: 14.5px; }
.pi-m { font-size: 12px; color: var(--muted); }
.sc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; margin-bottom: 40px; }
.sc-card { display: flex; flex-direction: column; gap: 8px; padding: 18px; background: var(--panel); border: 1px solid var(--border); border-radius: 14px; color: var(--text); transition: .15s; }
.sc-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow); }
.sc-card.done { border-color: color-mix(in srgb, var(--good) 50%, var(--border)); }
.sc-top { display: flex; justify-content: space-between; align-items: center; }
.sc-icon { font-size: 26px; }
.sc-card b { font-size: 16px; }
.sc-d { font-size: 13.5px; color: var(--muted); flex: 1; }
.sc-p { font-size: 12px; color: var(--muted); }
.lvl { font-size: 11px; font-weight: 600; padding: 2px 9px; border-radius: 99px; text-transform: uppercase; letter-spacing: .04em; }
.lvl-1 { background: color-mix(in srgb, var(--good) 18%, transparent); color: var(--good); }
.lvl-2 { background: color-mix(in srgb, var(--warn) 18%, transparent); color: var(--warn); }
.lvl-3 { background: color-mix(in srgb, var(--bad) 18%, transparent); color: var(--bad); }
.how { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.how div { padding: 18px; border-radius: 14px; border: 1px dashed var(--border2); display: flex; flex-direction: column; gap: 4px; }
.how span { color: var(--muted); font-size: 14px; }
.foot-note { text-align: center; color: var(--muted); font-size: 13px; margin-top: 36px; }

/* ---------- lekcje ---------- */
.lesson-layout { display: grid; grid-template-columns: 250px 1fr; gap: 36px; align-items: start; }
.lesson-nav { position: sticky; top: 80px; display: flex; flex-direction: column; gap: 2px; max-height: calc(100vh - 100px); overflow: auto; }
.ln-head { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); padding: 0 10px 8px; }
.lesson-nav a { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 8px; color: var(--muted); font-size: 14px; }
.lesson-nav a:hover { background: var(--panel2); color: var(--text); }
.lesson-nav a.active { background: var(--accent-soft); color: var(--text); font-weight: 600; }
.ln-n { flex: none; width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; font-size: 11px; font-weight: 700; background: var(--panel2); }
.lesson-nav a.done .ln-n { background: var(--good); color: #04120c; }
.lesson { min-width: 0; max-width: 800px; }
.lesson-meta { font-size: 13px; color: var(--muted); }
.lesson h1 { font-size: 36px; margin: 6px 0 18px; display: flex; align-items: center; gap: 12px; }
.l-icon { font-size: 32px; }
.lesson-body h3 { font-size: 20px; margin: 34px 0 10px; }
.lesson-body li { margin: 4px 0; }
.lead { font-size: 18px; color: var(--muted); }
.callout { padding: 14px 16px 14px 18px; border-radius: 12px; margin: 18px 0; border: 1px solid var(--border); border-left-width: 4px; background: var(--panel); }
.callout.tip { border-left-color: var(--good); }
.callout.warn { border-left-color: var(--warn); }
.callout.info { border-left-color: var(--accent); }
.tbl { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 14px; background: var(--panel); border-radius: 12px; overflow: hidden; border: 1px solid var(--border); }
.tbl th, .tbl td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
.tbl th { background: var(--panel2); font-weight: 600; font-size: 13px; color: var(--muted); }
.tbl tr:last-child td { border-bottom: 0; }
.code { background: var(--code-bg); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; font-size: 13px; line-height: 1.6; overflow-x: auto; white-space: pre; }
.chip { display: inline-block; font-family: var(--mono); font-size: 12.5px; padding: 4px 10px; margin: 2px 2px; border-radius: 7px; border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--border)); background: var(--accent-soft); color: var(--text); cursor: pointer; transition: .12s; text-align: left; }
.chip:hover { background: var(--accent); color: #04121c; border-color: var(--accent); }
.chips-list { list-style: none; padding: 0; }
.chips-list li { margin: 6px 0; color: var(--muted); font-size: 14px; }
.cards4 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin: 14px 0; }
.mini { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; display: flex; flex-direction: column; gap: 3px; }
.mini span { font-size: 13.5px; color: var(--muted); }
.legend { display: flex; flex-wrap: wrap; gap: 6px; }
.legend span { font-family: var(--mono); font-size: 12.5px; padding: 4px 10px; border-radius: 6px; }
.ws-mock { border: 1px solid var(--border); border-radius: 12px; overflow: hidden; margin: 14px 0; font-size: 13px; background: var(--panel); }
.ws-bar { font-family: var(--mono); padding: 8px 12px; background: color-mix(in srgb, var(--good) 22%, var(--panel)); border-bottom: 1px solid var(--border); }
.ws-p { padding: 14px; border-bottom: 1px solid var(--border); display: flex; gap: 10px; align-items: center; }
.ws-p span { width: 24px; height: 24px; border-radius: 50%; background: var(--accent); color: #04121c; display: grid; place-items: center; font-weight: 700; font-size: 12px; flex: none; }
.ws-1 { background: linear-gradient(var(--c-tcp-bg), var(--c-tcp-bg)) left / 6px 100% no-repeat; }
.ws-2 { background: linear-gradient(var(--c-udp-bg), var(--c-udp-bg)) left / 6px 100% no-repeat; }
.ws-3 { border-bottom: 0; font-family: var(--mono); }
.encap { display: flex; margin: 18px 0; border-radius: 12px; overflow: hidden; border: 1px solid var(--border); }
.enc { padding: 12px; display: flex; flex-direction: column; gap: 2px; min-width: 0; transition: flex .25s; }
.enc:hover { flex-grow: 1.6; }
.enc b { font-size: 14px; }
.enc span { font-family: var(--mono); font-size: 12px; opacity: .8; }
.enc small { font-size: 12px; opacity: .85; }
.enc-eth { flex: 1.1; background: var(--c-arp-bg); color: var(--c-arp-fg); }
.enc-ip { flex: 1.2; background: var(--c-udp-bg); color: var(--c-udp-fg); }
.enc-tcp { flex: 1.2; background: var(--c-tcp-bg); color: var(--c-tcp-fg); }
.enc-app { flex: 1.6; background: var(--c-http-bg); color: var(--c-http-fg); }
.steps li { margin: 8px 0; }
.ladder { margin: 18px 0; background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 8px; }
.ladder-svg { width: 100%; display: block; color: var(--accent); font-family: var(--sans); }
.ladder-svg .lh { fill: var(--text); font-weight: 700; font-size: 14px; }
.ladder-svg .ll { stroke: var(--border2); stroke-width: 2; stroke-dasharray: 4 4; }
.ladder-svg .la { stroke-width: 2; }
.ladder-svg .la-r { stroke: var(--accent); color: var(--accent); }
.ladder-svg .la-l { stroke: var(--accent2); color: var(--accent2); }
.ladder-svg .lt { fill: var(--text); font-family: var(--mono); font-size: 13px; font-weight: 600; }
.ladder-svg .ls { fill: var(--muted); font-size: 11.5px; }
.lstep { opacity: 0; animation: fadeIn .5s forwards; }

.quiz { margin-top: 44px; padding: 24px; border-radius: 16px; background: var(--panel); border: 1px solid var(--border); }
.quiz h2 { margin: 0 0 4px; }
.qq { padding: 14px 0; border-bottom: 1px solid var(--border); }
.qq-t { font-weight: 600; margin-bottom: 8px; }
.qo { display: flex; gap: 10px; align-items: center; padding: 7px 12px; border-radius: 9px; cursor: pointer; border: 1px solid transparent; }
.qo:hover { background: var(--panel2); }
.qo input { accent-color: var(--accent); }
.qq.good .qo.right { border-color: var(--good); background: color-mix(in srgb, var(--good) 12%, transparent); }
.qx { font-size: 13.5px; margin-top: 6px; }
.qq.good .qx { color: var(--good); }
.qq.bad .qx { color: var(--bad); }
.quiz > .btn { margin-top: 16px; }
.lesson-pn { display: flex; justify-content: space-between; gap: 12px; margin-top: 28px; flex-wrap: wrap; }

/* ---------- ściągawka ---------- */
.page h1 { font-size: 34px; margin: 0 0 6px; }
.cs-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.cs h3 { margin: 10px 0 6px; font-size: 17px; }
.cs-wide { grid-column: 1 / -1; }
.cs-t td:first-child { width: 55%; }
.ports { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 8px; }
.ports span { display: flex; gap: 10px; padding: 8px 12px; border: 1px solid var(--border); border-radius: 10px; background: var(--panel); font-size: 13.5px; }
.ports b { font-family: var(--mono); color: var(--accent); min-width: 40px; }

/* ---------- laboratorium ---------- */
body[data-view="lab"] { overflow: hidden; }
.lab { height: calc(100vh - 58px); display: grid; grid-template-rows: auto auto 1fr auto; }
.lab-top { display: flex; gap: 10px; padding: 10px 12px; border-bottom: 1px solid var(--border); background: var(--bg2); align-items: center; }
#sc-sel { background: var(--panel); color: var(--text); border: 1px solid var(--border); border-radius: 9px; padding: 8px 10px; font: inherit; font-size: 14px; max-width: 260px; }
.fbar { position: relative; flex: 1; display: flex; align-items: center; background: var(--panel); border: 1px solid var(--border2); border-radius: 9px; transition: .15s; min-width: 0; }
.fbar:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.fbar.ok { background: color-mix(in srgb, var(--good) 16%, var(--panel)); }
.fbar.err { background: color-mix(in srgb, var(--bad) 20%, var(--panel)); }
.fbar.warn { background: color-mix(in srgb, var(--warn) 20%, var(--panel)); }
.fic { width: 18px; height: 18px; margin-left: 10px; color: var(--muted); flex: none; }
#flt { flex: 1; min-width: 0; background: transparent; border: 0; outline: 0; color: var(--text); font: 14px var(--mono); padding: 9px 10px; }
.fb-btn { border: 0; background: transparent; cursor: pointer; padding: 0 12px; height: 36px; color: var(--muted); font-size: 15px; }
.fb-btn:hover { color: var(--text); }
.fb-go { color: var(--accent); font-weight: 700; font-size: 18px; border-left: 1px solid var(--border); }
.ac { position: absolute; top: calc(100% + 4px); left: 0; right: 0; max-height: 330px; overflow: auto; background: var(--panel); border: 1px solid var(--border2); border-radius: 10px; box-shadow: var(--shadow); z-index: 30; padding: 4px; }
.ac-i { display: flex; justify-content: space-between; gap: 16px; padding: 6px 10px; border-radius: 7px; cursor: pointer; font-size: 13px; }
.ac-i code { background: none; padding: 0; }
.ac-i span { color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ac-i:hover, .ac-i.on { background: var(--accent-soft); }
.tools { display: flex; gap: 6px; }
.tbtn { display: flex; align-items: center; gap: 6px; padding: 8px 12px; border-radius: 9px; border: 1px solid var(--border); background: var(--panel); cursor: pointer; font-size: 13.5px; white-space: nowrap; }
.tbtn:hover { border-color: var(--accent); }
.fmsg { padding: 6px 14px; font-size: 13px; border-bottom: 1px solid var(--border); }
.fmsg.err { background: color-mix(in srgb, var(--bad) 14%, var(--bg)); color: var(--bad); }
.fmsg.warn { background: color-mix(in srgb, var(--warn) 14%, var(--bg)); color: var(--warn); }
.lab-body { display: grid; grid-template-columns: 1fr 370px; min-height: 0; }
.lab.no-tasks .lab-body { grid-template-columns: 1fr 0; }
.lab.no-tasks .tasks { display: none; }
.panes { display: grid; grid-template-rows: 1.15fr 1fr .75fr; min-height: 0; min-width: 0; }
.pane { overflow: auto; border-bottom: 1px solid var(--border); min-height: 0; outline: 0; }
.pane:focus-visible { box-shadow: inset 0 0 0 2px var(--accent); }
.pane-empty { padding: 20px; color: var(--muted); font-size: 14px; }

.plist table { width: 100%; border-collapse: collapse; font: 12.5px/1 var(--mono); }
.plist thead th { position: sticky; top: 0; z-index: 2; background: var(--panel2); text-align: left; padding: 8px 10px; font: 600 12px var(--sans); color: var(--muted); border-bottom: 1px solid var(--border2); cursor: pointer; white-space: nowrap; user-select: none; }
.plist thead th:hover { color: var(--text); }
.plist thead th.sorted { color: var(--accent); }
.plist td { padding: 0 10px; height: 24px; white-space: nowrap; cursor: default; }
.plist tbody tr.spacer td { padding: 0; }
.plist td:last-child { width: 100%; }
.plist tbody tr { border-bottom: 1px solid color-mix(in srgb, var(--bg) 40%, transparent); }
.plist tbody tr.sel { background: var(--sel) !important; color: var(--sel-text, #fff) !important; }
.plist tbody tr:not(.sel):hover { filter: brightness(1.15); }
.plist tr.empty td { padding: 24px; color: var(--muted); font-family: var(--sans); text-align: center; }
.c-http { background: var(--c-http-bg); color: var(--c-http-fg); }
.c-tcp { background: var(--c-tcp-bg); color: var(--c-tcp-fg); }
.c-synfin { background: var(--c-synfin-bg); color: var(--c-synfin-fg); }
.c-rst { background: var(--c-rst-bg); color: var(--c-rst-fg); }
.c-ttl { background: var(--c-ttl-bg); color: var(--c-ttl-fg); }
.c-udp { background: var(--c-udp-bg); color: var(--c-udp-fg); }
.c-arp { background: var(--c-arp-bg); color: var(--c-arp-fg); }
.c-icmp { background: var(--c-icmp-bg); color: var(--c-icmp-fg); }
.c-icmperr { background: var(--c-icmperr-bg); color: var(--c-icmperr-fg); }
.c-bcast { background: var(--c-bcast-bg); color: var(--c-bcast-fg); }

.ptree { font: 12.5px/1.25 var(--mono); padding: 4px 0; background: var(--panel); }
.tn { display: flex; align-items: flex-start; gap: 4px; padding-top: 3px; padding-bottom: 3px; padding-right: 10px; cursor: default; white-space: nowrap; }
.tn:hover { background: var(--panel2); }
.tn.tn-top { font-weight: 600; }
.tn.gen .tl { color: var(--muted); }
.tn.warnn .tl { color: var(--warn); font-weight: 600; }
.tn.sel { background: var(--sel) !important; color: #fff; }
.tn.sel .tl { color: #fff; }
.car { width: 14px; flex: none; color: var(--muted); cursor: pointer; text-align: center; }
.tn.sel .car { color: #fff; }
.tl { min-width: 0; white-space: pre; }

.phex { font: 12.5px/1.55 var(--mono); padding: 6px 0; background: var(--bg2); }
.hr { display: flex; gap: 22px; padding: 0 12px; white-space: pre; }
.ho { color: var(--muted); }
.hb span, .ha span { cursor: pointer; border-radius: 2px; }
.hb span { padding: 0 3px; }
.hb i { display: inline-block; width: 8px; }
.hb span:hover, .ha span:hover { outline: 1px solid var(--accent); }
.hl { background: var(--hl); color: #1b1200; }

.status { display: flex; justify-content: space-between; gap: 18px; padding: 5px 12px; font-size: 12.5px; background: var(--bg2); border-top: 1px solid var(--border); white-space: nowrap; overflow: hidden; }
.status #st-l { overflow: hidden; text-overflow: ellipsis; }
.status code { font-size: 12px; }

.tasks { overflow: auto; border-left: 1px solid var(--border); background: var(--bg2); padding: 16px; }
.t-head { display: flex; gap: 12px; align-items: center; }
.t-head b { display: block; font-size: 16px; margin-bottom: 3px; }
.t-story { font-size: 13.5px; color: var(--muted); margin: 12px 0; }
.t-story b { color: var(--text); }
.t-prog { display: flex; gap: 10px; align-items: center; font-size: 12.5px; color: var(--muted); margin-bottom: 14px; }
.t-prog .bar { flex: 1; }
.task { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; margin-bottom: 10px; font-size: 13.5px; }
.task.done { border-color: color-mix(in srgb, var(--good) 45%, var(--border)); }
.task.shake { animation: shake .35s; }
@keyframes shake { 25% { transform: translateX(-5px); } 50% { transform: translateX(5px); } 75% { transform: translateX(-3px); } }
.t-q { display: flex; gap: 10px; }
.t-n { flex: none; width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; background: var(--panel2); font-size: 11.5px; font-weight: 700; color: var(--muted); }
.task.done .t-n { background: var(--good); color: #04120c; }
.t-kind { display: block; font-size: 10.5px; font-weight: 700; text-transform: uppercase; letter-spacing: .07em; color: var(--accent2); margin-bottom: 2px; }
.t-in { width: 100%; margin-top: 10px; padding: 8px 10px; border-radius: 8px; border: 1px solid var(--border2); background: var(--bg2); color: var(--text); font: 13px var(--mono); outline: 0; }
.t-in:focus { border-color: var(--accent); }
.t-opts { display: flex; flex-direction: column; gap: 2px; margin-top: 8px; }
.t-opts label { display: flex; gap: 8px; align-items: flex-start; padding: 5px 8px; border-radius: 7px; cursor: pointer; }
.t-opts label:hover { background: var(--panel2); }
.t-opts input { margin-top: 4px; accent-color: var(--accent); }
.t-fnote { color: var(--muted); font-size: 12.5px; margin: 8px 0 0; }
.t-actions { display: flex; gap: 6px; margin-top: 10px; }
.t-hintbox { margin-top: 10px; padding: 8px 10px; border-radius: 8px; background: color-mix(in srgb, var(--warn) 10%, transparent); font-size: 13px; }
.t-fb { margin-top: 8px; font-size: 13px; }
.t-fb:empty { display: none; }
.t-fb.ok { color: var(--text); }
.t-fb.ok b { color: var(--good); }
.t-fb.bad { color: var(--bad); }
.t-fb.warn { color: var(--warn); }

/* ---------- menu, modal, toast ---------- */
.ctx { position: fixed; z-index: 100; min-width: 240px; background: var(--panel); border: 1px solid var(--border2); border-radius: 10px; box-shadow: var(--shadow); padding: 5px; }
.ctx button { display: block; width: 100%; text-align: left; padding: 7px 10px; border: 0; background: none; border-radius: 6px; cursor: pointer; font-size: 13px; }
.ctx button:hover:not(:disabled) { background: var(--accent-soft); }
.ctx button:disabled { opacity: .4; cursor: default; }
.ctx button code { font-size: 11.5px; }
.ctx hr { border: 0; border-top: 1px solid var(--border); margin: 4px 0; }
.modal-wrap { position: fixed; inset: 0; z-index: 90; background: rgba(3, 7, 12, .6); backdrop-filter: blur(3px); display: grid; place-items: center; padding: 20px; }
.modal-wrap[hidden] { display: none; }
.modal { width: min(640px, 100%); max-height: calc(100vh - 40px); display: flex; flex-direction: column; background: var(--panel); border: 1px solid var(--border2); border-radius: 16px; box-shadow: var(--shadow); }
.modal.wide { width: min(1000px, 100%); }
.modal-h { display: flex; justify-content: space-between; align-items: center; padding: 14px 18px; border-bottom: 1px solid var(--border); }
.modal-h h2 { margin: 0; font-size: 17px; }
.modal-b { padding: 16px 18px; overflow: auto; }
.fs { background: var(--code-bg); border: 1px solid var(--border); border-radius: 10px; padding: 14px; font-size: 12.5px; line-height: 1.5; white-space: pre-wrap; word-break: break-all; max-height: 58vh; overflow: auto; margin: 10px 0; }
.fs span { display: block; }
.fs-c { color: #f87171; }
.fs-s { color: #60a5fa; }
:root[data-theme="light"] .fs-c { color: #b91c1c; }
:root[data-theme="light"] .fs-s { color: #1d4ed8; }
.fs-legend { display: flex; flex-wrap: wrap; gap: 16px; font: 12.5px var(--mono); }
.tabs { display: flex; gap: 4px; flex-wrap: wrap; border-bottom: 1px solid var(--border); padding-bottom: 8px; }
.tabs button { border: 0; background: none; padding: 7px 12px; border-radius: 8px; cursor: pointer; font-size: 13.5px; color: var(--muted); }
.tabs button.on { background: var(--accent-soft); color: var(--text); font-weight: 600; }
.tbl.st { font-size: 13px; }
.tbl.st td { padding: 6px 12px; }
.tbl.st tr[data-f] { cursor: pointer; }
.tbl.st tr[data-f]:hover td { background: var(--accent-soft); }
.tbl.st code { font-size: 11px; }
.pbar { position: relative; height: 18px; background: var(--panel2); border-radius: 5px; min-width: 120px; overflow: hidden; }
.pbar i { position: absolute; inset: 0 auto 0 0; background: color-mix(in srgb, var(--accent) 45%, transparent); }
.pbar span { position: relative; font-size: 11.5px; padding-left: 6px; line-height: 18px; }
.sev { font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 99px; }
.sev-Warning { background: color-mix(in srgb, var(--warn) 22%, transparent); color: var(--warn); }
.sev-Note { background: color-mix(in srgb, var(--accent) 22%, transparent); color: var(--accent); }
.sev-Chat { background: var(--panel2); color: var(--muted); }
.sev-Error { background: color-mix(in srgb, var(--bad) 22%, transparent); color: var(--bad); }
.swatch { font-family: var(--mono); font-size: 12.5px; width: 40%; }
.toasts { position: fixed; bottom: 20px; right: 20px; z-index: 200; display: flex; flex-direction: column; gap: 8px; align-items: flex-end; }
.toast { padding: 11px 16px; border-radius: 11px; background: var(--panel); border: 1px solid var(--border2); box-shadow: var(--shadow); font-size: 14px; animation: slideIn .25s; transition: opacity .4s, transform .4s; max-width: 380px; }
.toast-ok { border-left: 4px solid var(--good); }
.toast-warn { border-left: 4px solid var(--warn); }
.toast.out { opacity: 0; transform: translateY(8px); }

/* ---------- własny plik ---------- */
.own { display: flex; gap: 18px; align-items: center; padding: 20px 22px; margin-bottom: 40px; border-radius: 16px; border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--border)); background: linear-gradient(120deg, var(--accent-soft), transparent 70%), var(--panel); }
.own-ic { font-size: 34px; }
.own > div:nth-child(2) { flex: 1; display: flex; flex-direction: column; gap: 4px; }
.own span { color: var(--muted); font-size: 14px; }
.import { height: calc(100vh - 58px); overflow: auto; padding: 28px 24px 48px; }
.drop { max-width: 760px; margin: 0 auto 28px; text-align: center; padding: 36px 24px; border: 2px dashed var(--border2); border-radius: 20px; background: var(--panel); }
.drop h1 { margin: 6px 0 10px; font-size: 28px; }
.drop p { color: var(--muted); }
.drop-ic { font-size: 46px; }
.import-grid { max-width: 1100px; margin: 0 auto; display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.import-grid section { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 4px 18px 14px; font-size: 14px; }
.import-grid h3 { font-size: 16px; }
.import-grid li { margin: 4px 0; }
.protos { line-height: 1.9; }
.drop-overlay { position: fixed; inset: 0; z-index: 300; display: none; place-items: center; background: color-mix(in srgb, var(--bg) 70%, transparent); backdrop-filter: blur(4px); pointer-events: none; }
.drop-overlay div { padding: 40px 56px; border: 3px dashed var(--accent); border-radius: 22px; background: var(--panel); font-size: 20px; font-weight: 600; display: flex; flex-direction: column; align-items: center; gap: 10px; }
.drop-overlay span { font-size: 52px; }
body.dragging .drop-overlay { display: grid; }
.bar.big { height: 10px; margin: 12px 0 6px; }
.fname { max-width: 260px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.meta { display: grid; grid-template-columns: auto 1fr; gap: 3px 12px; font-size: 13px; margin: 14px 0 4px; }
.meta dt { color: var(--muted); }
.meta dd { margin: 0; overflow-wrap: anywhere; }
.pn-h { font-size: 12px; text-transform: uppercase; letter-spacing: .07em; color: var(--muted); margin: 18px 0 8px; }
.find { background: var(--panel); border: 1px solid var(--border); border-left-width: 4px; border-radius: 10px; padding: 9px 12px; margin-bottom: 8px; font-size: 13px; }
.find-high { border-left-color: var(--bad); }
.find-med { border-left-color: var(--warn); }
.find-info { border-left-color: var(--accent); }
.find-ok { border-left-color: var(--good); }
.find-t { font-weight: 600; margin-bottom: 3px; }
.find-i { color: var(--muted); font-family: var(--mono); font-size: 12px; overflow-wrap: anywhere; }
.find-f { margin-top: 6px; }
.find-f .chip, .chips-wrap .chip { font-size: 11.5px; padding: 3px 8px; }
.chips-wrap { display: flex; flex-wrap: wrap; gap: 2px; }
.rank { display: flex; flex-direction: column; gap: 2px; }
.rank button { display: flex; justify-content: space-between; gap: 10px; text-align: left; border: 0; background: var(--panel); border-radius: 7px; padding: 6px 10px; cursor: pointer; font: 12.5px var(--mono); }
.rank button:hover { background: var(--accent-soft); }
.rank span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.rank b { color: var(--accent); font-weight: 600; flex: none; }
.kind { font-style: normal; font-size: 10px; font-family: var(--sans); font-weight: 700; color: var(--accent2); margin-right: 6px; }
.tips { font-size: 13px; padding-left: 20px; color: var(--muted); }
.tips li { margin: 4px 0; }
.tips b { color: var(--text); }

/* ---------- styl „red team” ---------- */
.rt body {
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(0, 255, 136, .07), transparent 70%),
    linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 34px 34px,
    linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 34px 34px,
    var(--bg);
  background-attachment: fixed;
}
.rt body::after {
  content: ''; position: fixed; inset: 0; pointer-events: none; z-index: 500; opacity: var(--scan);
  background: repeating-linear-gradient(0deg, #000 0 1px, transparent 1px 3px);
}
.rt h1, .rt h2, .rt h3, .rt .sec-title, .rt .logo, .rt .stat-v, .rt .t-head b, .rt .modal-h h2 { font-family: var(--mono); letter-spacing: -.02em; }
.rt .sec-title::before, .rt .pn-h::before { content: '// '; color: var(--accent2); }
.rt .top { border-bottom-color: var(--border2); }
.rt .logo { font-weight: 700; text-transform: lowercase; }
.rt .logo b { background: none; -webkit-background-clip: initial; background-clip: initial; color: var(--accent); text-shadow: var(--glow); }
.rt .logo .cur { color: var(--accent); font-style: normal; animation: caret 1s steps(1) infinite; }
.rt .logo svg { filter: drop-shadow(0 0 6px rgba(0, 255, 136, .5)); }
.rt .nav a { font-family: var(--mono); font-size: 13px; text-transform: uppercase; letter-spacing: .04em; border-radius: 2px; }
.rt .nav a.active { background: transparent; box-shadow: inset 0 -2px 0 var(--accent); color: var(--accent); }
.rt .nav a.active::before { content: '> '; color: var(--accent2); }
.rt .xp, .rt .xp-rank { border-radius: 2px; font-family: var(--mono); }
.rt .btn, .rt .tbtn, .rt .icon-btn, .rt .chip, .rt .fbar, .rt #sc-sel, .rt .t-in, .rt .stat, .rt .path-item, .rt .sc-card, .rt .hero-art, .rt .tbl, .rt .callout, .rt .quiz, .rt .task, .rt .modal, .rt .ctx, .rt .lesson-nav a, .rt .find, .rt .drop, .rt .import-grid section, .rt .own, .rt .mini, .rt .ws-mock, .rt .ladder, .rt .encap, .rt .code, .rt .fs, .rt .how div, .rt .toast, .rt .rank button, .rt .ac, .rt .t-hintbox, .rt .tabs button { border-radius: 3px; }
.rt .btn { font-family: var(--mono); text-transform: uppercase; letter-spacing: .06em; font-size: 13px; }
.rt .btn-primary { background: var(--accent); color: #00140a; box-shadow: var(--glow); }
.rt .btn-primary:hover { box-shadow: 0 0 32px rgba(0, 255, 136, .55); filter: brightness(1.08); }
:root.rt[data-theme="light"] .btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #fff; }
.rt .btn-ghost { background: transparent; border-color: color-mix(in srgb, var(--accent) 35%, var(--border)); }
.rt .btn-ghost:hover { box-shadow: var(--glow); }
.rt .stat, .rt .sc-card, .rt .hero-art, .rt .drop, .rt .own, .rt .quiz {
  background:
    linear-gradient(var(--corner), var(--corner)) 0 0 / 14px 2px no-repeat,
    linear-gradient(var(--corner), var(--corner)) 0 0 / 2px 14px no-repeat,
    linear-gradient(var(--corner), var(--corner)) 100% 100% / 14px 2px no-repeat,
    linear-gradient(var(--corner), var(--corner)) 100% 100% / 2px 14px no-repeat,
    var(--panel);
}
.rt .sc-card:hover, .rt .path-item:hover, .rt .stat:hover { box-shadow: var(--glow); border-color: var(--accent); }
.rt .eyebrow { font-family: var(--mono); color: var(--accent2); text-transform: none; letter-spacing: 0; font-size: 13.5px; }
.rt .eyebrow b { color: var(--accent); font-weight: 600; }
.rt .hero h1 { font-weight: 800; font-size: clamp(26px, 3.6vw, 46px); letter-spacing: -.04em; }
.rt .nowrap { white-space: nowrap; }
@media (max-width: 640px) { .nowrap { white-space: normal; } }
.rt .grad { background: none; -webkit-background-clip: initial; background-clip: initial; color: var(--accent); text-shadow: var(--glow); }
:root.rt[data-theme="light"] .grad { color: var(--accent); }
.rt .caret { display: inline-block; width: .55em; height: .9em; margin-left: .12em; background: var(--accent2); vertical-align: -.05em; animation: caret 1s steps(1) infinite; }
@keyframes caret { 50% { opacity: 0; } }
.rt .glitch { position: relative; display: inline-block; }
.rt .glitch::before, .rt .glitch::after { content: attr(data-text); position: absolute; inset: 0; pointer-events: none; text-shadow: none; }
.rt .glitch::before { color: var(--accent2); animation: gl1 4s infinite steps(1); }
.rt .glitch::after { color: #00e5ff; animation: gl2 3.3s infinite steps(1); }
@keyframes gl1 { 0%, 88%, 100% { clip-path: inset(0 0 100% 0); transform: none; } 90% { clip-path: inset(15% 0 55% 0); transform: translate(4px, -1px); } 93% { clip-path: inset(62% 0 8% 0); transform: translate(-4px, 1px); } 96% { clip-path: inset(40% 0 35% 0); transform: translate(2px, 0); } }
@keyframes gl2 { 0%, 84%, 100% { clip-path: inset(0 0 100% 0); transform: none; } 86% { clip-path: inset(70% 0 5% 0); transform: translate(-3px, 0); } 89% { clip-path: inset(5% 0 75% 0); transform: translate(3px, 1px); } }
.rt .cap-head { display: flex; align-items: center; gap: 8px; font: 12px var(--mono); color: var(--muted); padding: 0 4px 10px; border-bottom: 1px dashed var(--border2); margin-bottom: 8px; text-transform: uppercase; letter-spacing: .06em; }
.rt .cap-head b { color: var(--accent2); }
.rt .cap-head .pk { margin-left: auto; color: var(--accent); }
.rt .rec { width: 9px; height: 9px; border-radius: 50%; background: var(--accent2); box-shadow: 0 0 10px var(--accent2); animation: caret 1.2s steps(1) infinite; }
.rt .hs-hex text { fill: var(--accent); }
.rt .tn.sel, .rt .tn.sel .tl, .rt .tn.sel .car { color: var(--sel-text); }
.rt .plist tbody tr.sel { font-weight: 600; }
.rt .hl { color: var(--hl-text); }
.rt .t-kind { color: var(--accent2); font-family: var(--mono); }
.rt .fb-go { color: var(--accent); }
.rt .status { font-family: var(--mono); font-size: 12px; }
.rt .status #st-r { color: var(--accent); }
.rt .lab-top { background: color-mix(in srgb, var(--bg2) 92%, transparent); }
.rt .lesson h1 { font-size: 32px; }
.rt .lesson-nav a.active { box-shadow: inset 2px 0 0 var(--accent); }
.rt .drop { border-style: dashed; border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); }
.rt * { scrollbar-width: thin; scrollbar-color: var(--border2) transparent; }
.rt ::-webkit-scrollbar { width: 10px; height: 10px; }
.rt ::-webkit-scrollbar-thumb { background: var(--border2); border: 2px solid transparent; background-clip: content-box; }
.rt ::-webkit-scrollbar-thumb:hover { background-color: var(--accent); }
.rt ::-webkit-scrollbar-track { background: transparent; }
@media (prefers-reduced-motion: reduce) {
  .glitch::before, .glitch::after { display: none; }
  .caret, .rec, .logo .cur, .lstep, .hx, .hs-layers text, .hs-hex text { animation: none !important; opacity: 1 !important; }
}

/* styl klasyczny (przełącznik w nagłówku) — pierwotna, niebieska paleta ciemnego motywu */
:root:not(.rt):not([data-theme="light"]) {
  --bg: #0a0f16;
  --bg2: #0e151f;
  --panel: #111a26;
  --panel2: #172232;
  --border: #223146;
  --border2: #2c3e57;
  --text: #e3eaf3;
  --muted: #8a9ab0;
  --accent: #38bdf8;
  --accent2: #2dd4bf;
  --accent-soft: rgba(56, 189, 248, .14);
  --good: #34d399;
  --bad: #f87171;
  --warn: #fbbf24;
  --sel: #1d4ed8;
  --sel-text: #fff;
  --hl: #f59e0b;
  --hl-text: #1b1200;
  --code-bg: #0b121c;
  --shadow: 0 10px 40px rgba(0, 0, 0, .45);
  --glow: none;
  --scan: 0;
  --grid: transparent;
  --corner: transparent;
}
/* skrót `font:` resetuje ligatury — w filtrach „==” musi wyglądać jak „==” */
input, code, kbd, pre, .chip, .plist table, .ptree, .phex, .hero-svg { font-variant-ligatures: none !important; }

/* ---------- responsywność ---------- */
@media (max-width: 1100px) {
  body[data-view="lab"] { overflow: auto; }
  .lab { height: auto; }
  .lab-top { flex-wrap: wrap; }
  .fbar { order: 3; flex-basis: 100%; }
  .lab-body { grid-template-columns: 1fr; }
  .panes { grid-template-rows: 320px 320px 220px; }
  .tasks { border-left: 0; border-top: 1px solid var(--border); }
  .lab.no-tasks .lab-body { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .lesson-layout { grid-template-columns: 1fr; }
  .lesson-nav { position: static; max-height: none; flex-direction: row; overflow-x: auto; padding-bottom: 6px; }
  .lesson-nav a { white-space: nowrap; }
  .ln-head { display: none; }
  .cs-grid, .how, .import-grid { grid-template-columns: 1fr; }
  .own { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 640px) {
  .top { gap: 10px; padding: 0 12px; }
  .logo span, .xp-rank, .seg span { display: none; }
  .nav a { padding: 6px 8px; font-size: 13.5px; }
  body:not([data-view="lab"]) main { padding: 20px 16px 48px; }
  .tools .tbtn span { display: none; }
  #sc-sel { max-width: none; flex: 1; }
  .cards4 { grid-template-columns: 1fr; }
  .lesson h1 { font-size: 28px; }
  .encap { flex-direction: column; }
  .lesson-body .tbl, .cs .tbl { display: block; overflow-x: auto; }
}