:root {
  --bg: #0a0e14;
  --bg2: #0f141c;
  --panel: #121923;
  --panel2: #172030;
  --line: #222d3d;
  --line2: #2c3a4f;
  --text: #dbe3ee;
  --soft: #aab6c6;
  --muted: #6f7d91;
  --green: #4ade80;
  --green-d: #16a34a;
  --cyan: #38bdf8;
  --amber: #fbbf24;
  --orange: #fb923c;
  --red: #f87171;
  --violet: #a78bfa;
  --d1: #4ade80; --d2: #38bdf8; --d3: #fbbf24; --d4: #f472b6;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: Inter, system-ui, -apple-system, "Segoe UI", sans-serif;
  --r: 10px;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { background: var(--bg); color: var(--text); font: 14.5px/1.6 var(--sans); display: flex; flex-direction: column; overflow: hidden; }
code, kbd, pre, .diagram { font-family: var(--mono); font-variant-ligatures: none; font-feature-settings: "liga" 0, "calt" 0; }
code, kbd { font-size: .86em; }
code { background: #1b2433; border: 1px solid #263248; padding: .08em .38em; border-radius: 5px; color: #e8eef7; white-space: nowrap; }
pre code { white-space: pre; }
kbd { background: #1b2433; border: 1px solid var(--line2); border-bottom-width: 2px; padding: .05em .4em; border-radius: 4px; }
b { color: #fff; font-weight: 600; }
::selection { background: #2a4a6e; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: #243041; border-radius: 10px; border: 2px solid var(--bg2); }
::-webkit-scrollbar-track { background: transparent; }

/* ---------- buttons ---------- */
.btn { font: 500 13px var(--sans); cursor: pointer; border-radius: 8px; border: 1px solid var(--line2); background: var(--panel2); color: var(--text); padding: 7px 13px; display: inline-flex; align-items: center; gap: 6px; transition: .15s; }
.btn:hover { border-color: #3d4f69; background: #1c2739; }
.btn:disabled { opacity: .55; cursor: progress; }
.btn.ghost { background: transparent; }
.btn.ghost:hover { background: #151d29; }
.btn.danger:hover { color: var(--red); border-color: #7f2a2a; }
.btn.primary { background: linear-gradient(180deg, #22c55e, #16a34a); border-color: #22c55e; color: #04110a; font-weight: 700; }
.btn.primary:hover { filter: brightness(1.08); }
.btn .i { font-size: 14px; }

/* ---------- top bar ---------- */
.topbar { height: 58px; flex: none; display: flex; align-items: center; gap: 28px; padding: 0 18px; background: linear-gradient(180deg, #0f1520, #0c1119); border-bottom: 1px solid var(--line); }
.brand { font: 600 19px var(--mono); letter-spacing: -.02em; color: var(--soft); }
.brand b { color: var(--green); font-weight: 700; }
.brand-mark { color: var(--green); animation: blink 1.2s steps(1) infinite; margin-right: 2px; }
@keyframes blink { 50% { opacity: 0; } }
.stats { display: flex; align-items: center; gap: 18px; }
.rank { font: 600 12px var(--sans); text-transform: uppercase; letter-spacing: .08em; color: var(--amber); background: rgba(251, 191, 36, .08); border: 1px solid rgba(251, 191, 36, .25); padding: 4px 10px; border-radius: 99px; }
.score { font: 700 18px var(--mono); color: #fff; }
.score small { font-weight: 400; color: var(--muted); font-size: 12px; }
.progress { display: flex; align-items: center; gap: 10px; color: var(--muted); font: 12px var(--mono); }
.bar { width: 160px; height: 6px; background: #1a2230; border-radius: 9px; overflow: hidden; }
.bar i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--green-d), var(--green)); border-radius: 9px; transition: width .6s cubic-bezier(.2, .8, .2, 1); box-shadow: 0 0 12px rgba(74, 222, 128, .5); }
.top-actions { margin-left: auto; display: flex; gap: 6px; }

/* ---------- layout ---------- */
.layout { flex: 1; min-height: 0; display: grid; grid-template-columns: 270px minmax(380px, 460px) 1fr; }

/* ---------- chapter map ---------- */
.map { background: var(--bg2); border-right: 1px solid var(--line); overflow-y: auto; padding: 12px 10px 30px; }
.chapter { margin-bottom: 6px; border-radius: var(--r); }
.ch-head { width: 100%; display: flex; align-items: center; gap: 10px; padding: 9px 10px; background: none; border: 1px solid transparent; border-radius: var(--r); color: var(--text); cursor: pointer; text-align: left; font: inherit; }
.ch-head:hover { background: #121a26; }
.chapter.open .ch-head { background: #111925; border-color: var(--line); }
.ch-icon { width: 30px; height: 30px; flex: none; display: grid; place-items: center; border-radius: 8px; background: #172131; border: 1px solid var(--line2); font: 600 15px var(--mono); color: var(--cyan); }
.chapter.done .ch-icon { color: var(--green); border-color: rgba(74, 222, 128, .35); background: rgba(74, 222, 128, .07); }
.chapter.locked .ch-icon { color: var(--muted); }
.ch-text { flex: 1; min-width: 0; }
.ch-title { font-weight: 600; font-size: 13.5px; display: block; }
.ch-meta { display: flex; align-items: center; gap: 8px; font: 11px var(--mono); color: var(--muted); }
.ch-meta .mini-bar { flex: 1; height: 3px; background: #1d2736; border-radius: 3px; overflow: hidden; max-width: 90px; }
.ch-meta .mini-bar i { display: block; height: 100%; background: var(--green); }
.ch-caret { color: var(--muted); font-size: 11px; transition: transform .2s; }
.chapter.open .ch-caret { transform: rotate(90deg); }
.ch-levels { list-style: none; margin: 4px 0 8px; padding: 0 0 0 14px; display: none; }
.chapter.open .ch-levels { display: block; }
.lv { display: flex; align-items: center; gap: 9px; padding: 6px 10px; margin: 1px 0; border-radius: 8px; cursor: pointer; color: var(--soft); font-size: 13px; border-left: 2px solid transparent; }
.lv:hover { background: #131b27; color: var(--text); }
.lv.active { background: linear-gradient(90deg, rgba(56, 189, 248, .12), transparent); color: #fff; border-left-color: var(--cyan); }
.lv.locked { opacity: .38; cursor: not-allowed; }
.lv .st { width: 16px; text-align: center; font-size: 11px; flex: none; }
.lv.solved .st { color: var(--green); }
.lv.open .st { color: var(--cyan); }
.lv .name { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pips { display: inline-flex; gap: 2px; }
.pips i { width: 5px; height: 5px; border-radius: 2px; background: #2a3446; }
.pips.d1 i:nth-child(-n+1) { background: var(--d1); }
.pips.d2 i:nth-child(-n+2) { background: var(--d2); }
.pips.d3 i:nth-child(-n+3) { background: var(--d3); }
.pips.d4 i:nth-child(-n+4) { background: var(--d4); }
.lock-note { font-size: 12px; color: var(--muted); padding: 2px 12px 8px 54px; }

/* ---------- briefing ---------- */
.brief { background: var(--panel); border-right: 1px solid var(--line); overflow-y: auto; }
.brief-inner { padding: 22px 24px 40px; animation: fadein .25s ease; }
@keyframes fadein { from { opacity: 0; transform: translateY(4px); } }
.crumb { font: 500 11.5px var(--mono); color: var(--muted); text-transform: uppercase; letter-spacing: .08em; }
.crumb b { color: var(--cyan); font-weight: 500; }
.brief h1 { font-size: 26px; line-height: 1.2; margin: 6px 0 12px; letter-spacing: -.02em; font-weight: 800; }
.brief h1 .solved-mark { color: var(--green); font-size: .8em; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 18px; }
.chip { font: 600 11px var(--sans); padding: 4px 9px; border-radius: 99px; border: 1px solid var(--line2); color: var(--soft); text-transform: uppercase; letter-spacing: .05em; display: inline-flex; align-items: center; gap: 5px; }
.chip.d1 { color: var(--d1); border-color: rgba(74, 222, 128, .3); }
.chip.d2 { color: var(--d2); border-color: rgba(56, 189, 248, .3); }
.chip.d3 { color: var(--d3); border-color: rgba(251, 191, 36, .3); }
.chip.d4 { color: var(--d4); border-color: rgba(244, 114, 182, .35); }
.chip.pts { color: #fff; }
.chip.pts s { color: var(--muted); }
.mission { position: relative; background: linear-gradient(180deg, #162031, #131c2a); border: 1px solid var(--line2); border-radius: var(--r); padding: 14px 16px 14px 18px; font-size: 15px; line-height: 1.65; }
.mission::before { content: ""; position: absolute; left: 0; top: 10px; bottom: 10px; width: 3px; border-radius: 3px; background: var(--cyan); }
.mission-label { font: 600 10.5px var(--mono); color: var(--cyan); letter-spacing: .14em; text-transform: uppercase; margin-bottom: 4px; }
.sec { margin-top: 22px; }
.sec h3 { font: 600 11px var(--mono); text-transform: uppercase; letter-spacing: .12em; color: var(--muted); margin: 0 0 8px; display: flex; align-items: center; gap: 10px; }
.sec h3::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.sec p { margin: 0; color: var(--soft); }
.toolbox { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.toolbox code { background: #101722; border-color: var(--line2); color: #b8f7cf; }
.guide-link { margin-top: 10px; background: none; border: none; color: var(--cyan); font: 500 13px var(--sans); cursor: pointer; padding: 0; }
.guide-link:hover { text-decoration: underline; }
.hints { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.hints li { background: rgba(251, 191, 36, .05); border: 1px solid rgba(251, 191, 36, .18); border-radius: 8px; padding: 8px 12px 8px 36px; position: relative; color: var(--soft); animation: fadein .3s ease; }
.hints li::before { content: attr(data-n); position: absolute; left: 10px; top: 8px; width: 18px; height: 18px; border-radius: 50%; background: rgba(251, 191, 36, .15); color: var(--amber); font: 700 11px/18px var(--mono); text-align: center; }
.hint-btn { margin-top: 8px; width: 100%; justify-content: center; border-style: dashed; color: var(--amber); }
.hint-btn small { color: var(--muted); font-weight: 400; }
.answer { margin-top: 24px; padding-top: 18px; border-top: 1px solid var(--line); }
.answer form { display: flex; gap: 8px; }
.answer input { flex: 1; min-width: 0; font: 14px var(--mono); padding: 10px 12px; background: #0b1018; color: #fff; border: 1px solid var(--line2); border-radius: 8px; transition: .15s; }
.answer input:focus { outline: none; border-color: var(--green); box-shadow: 0 0 0 3px rgba(74, 222, 128, .12); }
.answer .btn { padding: 10px 16px; font-size: 14px; }
.answer .check { width: 100%; justify-content: center; padding: 12px; }
.feedback { min-height: 22px; margin-top: 10px; font-weight: 500; font-size: 13.5px; }
.feedback.ok { color: var(--green); }
.feedback.bad { color: var(--red); }
.feedback.bad.shake { animation: shake .35s; }
@keyframes shake { 25% { transform: translateX(-5px); } 75% { transform: translateX(5px); } }
.solved-banner { display: flex; gap: 10px; align-items: center; margin-top: 24px; padding: 12px 14px; border-radius: var(--r); background: rgba(74, 222, 128, .07); border: 1px solid rgba(74, 222, 128, .25); color: var(--green); font-weight: 500; }
.solved-banner .btn { margin-left: auto; }
.spinner { width: 14px; height: 14px; border: 2px solid rgba(255, 255, 255, .25); border-top-color: currentColor; border-radius: 50%; animation: spin .7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.intro h1 { font-size: 30px; }
.intro p { color: var(--soft); }
.chapter-grid { display: grid; gap: 8px; margin-top: 18px; }
.chapter-card { display: flex; gap: 12px; align-items: center; padding: 12px; border-radius: var(--r); border: 1px solid var(--line); background: #111925; cursor: pointer; text-align: left; color: var(--text); font: inherit; }
.chapter-card:hover { border-color: var(--line2); background: #142032; }
.chapter-card p { margin: 0; font-size: 12.5px; color: var(--muted); }

/* primer */
.diagram .cm { color: #6f7d91; }
.primer { margin-top: 22px; border: 1px solid rgba(167, 139, 250, .28); background: linear-gradient(180deg, rgba(167, 139, 250, .07), rgba(167, 139, 250, .02)); border-radius: var(--r); }
.primer summary { list-style: none; cursor: pointer; display: flex; align-items: center; gap: 10px; padding: 11px 14px; color: var(--soft); font-size: 13.5px; }
.primer summary::-webkit-details-marker { display: none; }
.primer summary b { color: #ddd6fe; }
.primer summary:hover { color: var(--text); }
.p-ico { font-size: 16px; }
.p-free { margin-left: auto; font: 600 10px var(--mono); text-transform: uppercase; letter-spacing: .1em; color: var(--violet); border: 1px solid rgba(167, 139, 250, .4); padding: 2px 7px; border-radius: 99px; }
.primer[open] summary { border-bottom: 1px solid rgba(167, 139, 250, .18); }
.primer-body { padding: 12px 14px 14px; color: var(--soft); font-size: 13.5px; animation: fadein .25s ease; }
.primer-body p { margin: 0 0 10px; }
.primer-body .diagram { font-size: 11.5px; line-height: 1.6; margin: 0 0 10px; white-space: pre-wrap; overflow-wrap: anywhere; padding: 12px 14px; }
.primer-body code { white-space: normal; overflow-wrap: anywhere; }
.brief { overflow-x: hidden; }
.mission code, .sec p code { white-space: normal; overflow-wrap: anywhere; }
.primer-body .p-note { margin: 10px 0 0; font-size: 12.5px; color: var(--muted); }

/* ---------- console ---------- */
.console { display: flex; flex-direction: column; min-width: 0; min-height: 0; background: #05080c; }
.console-bar { height: 38px; flex: none; display: flex; align-items: center; gap: 12px; padding: 0 14px; border-bottom: 1px solid #141b26; background: #0a0f16; }
.dots { display: flex; gap: 6px; }
.dots i { width: 11px; height: 11px; border-radius: 50%; background: #2a3342; }
.dots i:nth-child(1) { background: #f87171aa; } .dots i:nth-child(2) { background: #fbbf24aa; } .dots i:nth-child(3) { background: #4ade80aa; }
.console-title { font: 12px var(--mono); color: var(--muted); flex: 1; text-align: center; }
.conn { display: flex; align-items: center; gap: 7px; font: 500 11.5px var(--mono); color: var(--muted); cursor: default; }
.conn i { width: 8px; height: 8px; border-radius: 50%; background: var(--amber); box-shadow: 0 0 8px var(--amber); animation: pulse 1.4s infinite; }
.conn.live i { background: var(--green); box-shadow: 0 0 8px var(--green); animation: none; }
.conn.live b { color: var(--green); }
.conn.dead { cursor: pointer; }
.conn.dead i { background: var(--red); box-shadow: 0 0 8px var(--red); animation: none; }
.conn.dead b { color: var(--red); }
.conn b { font-weight: 500; }
@keyframes pulse { 50% { opacity: .35; } }
.term-wrap { flex: 1; position: relative; min-height: 0; }
#terminal { position: absolute; inset: 10px 4px 6px 14px; }
.xterm-viewport::-webkit-scrollbar-thumb { border-color: #05080c; }

/* ---------- overlays & modals ---------- */
.overlay { position: fixed; inset: 0; z-index: 50; background: rgba(3, 6, 10, .72); backdrop-filter: blur(6px); display: grid; place-items: center; padding: 24px; animation: fade .2s ease; }
.overlay[hidden] { display: none; }
@keyframes fade { from { opacity: 0; } }
.modal { background: var(--panel); border: 1px solid var(--line2); border-radius: 16px; box-shadow: 0 30px 80px rgba(0, 0, 0, .6); animation: pop .28s cubic-bezier(.2, .9, .3, 1.2); position: relative; }
@keyframes pop { from { transform: scale(.94) translateY(10px); opacity: 0; } }

.debrief { width: min(760px, 100%); max-height: calc(100vh - 48px); overflow-y: auto; }
.db-hero { display: flex; gap: 18px; align-items: center; padding: 26px 28px 20px; background: radial-gradient(120% 140% at 0% 0%, rgba(74, 222, 128, .16), transparent 55%), linear-gradient(180deg, #142231, var(--panel)); border-bottom: 1px solid var(--line); border-radius: 16px 16px 0 0; }
.db-check svg { width: 58px; height: 58px; }
.db-check circle { fill: rgba(74, 222, 128, .1); stroke: var(--green); stroke-width: 2.5; stroke-dasharray: 160; stroke-dashoffset: 160; animation: draw .6s ease forwards; }
.db-check path { fill: none; stroke: var(--green); stroke-width: 4; stroke-linecap: round; stroke-linejoin: round; stroke-dasharray: 40; stroke-dashoffset: 40; animation: draw .35s .45s ease forwards; }
@keyframes draw { to { stroke-dashoffset: 0; } }
.db-kicker { font: 600 11px var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--green); }
.db-hero h2 { margin: 2px 0 4px; font-size: 24px; letter-spacing: -.02em; }
.db-points { font: 600 14px var(--mono); color: var(--amber); }
.db-points span { color: var(--muted); font-weight: 400; }
.db-body { padding: 8px 28px 6px; }
.db-body section { margin: 16px 0; }
.db-body h4 { margin: 0 0 6px; font: 600 11px var(--mono); text-transform: uppercase; letter-spacing: .12em; color: var(--muted); }
.db-body p { margin: 0; color: var(--soft); }
.cmd-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.cmd-table td { padding: 7px 10px; border-top: 1px solid var(--line); vertical-align: top; color: var(--soft); }
.cmd-table tr:first-child td { border-top: none; }
.cmd-table td:first-child { width: 44%; }
.cmd-table td:first-child code { color: #b8f7cf; background: #0e1520; white-space: normal; word-break: break-word; }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.tipbox { background: rgba(56, 189, 248, .06); border: 1px solid rgba(56, 189, 248, .2); border-radius: var(--r); padding: 12px 14px; }
.tipbox h4 { color: var(--cyan) !important; }
.db-actions { display: flex; justify-content: flex-end; gap: 8px; padding: 16px 28px 22px; }

.guide { width: min(1080px, 100%); height: min(780px, calc(100vh - 48px)); display: grid; grid-template-columns: 240px 1fr; overflow: hidden; }
.guide-toc { background: var(--bg2); border-right: 1px solid var(--line); padding: 22px 12px; overflow-y: auto; }
.guide-toc h5 { margin: 16px 10px 6px; font: 600 10.5px var(--mono); text-transform: uppercase; letter-spacing: .14em; color: var(--muted); }
.guide-toc h5:first-child { margin-top: 0; }
.guide-toc button { display: block; width: 100%; text-align: left; background: none; border: none; color: var(--soft); font: 13.5px var(--sans); padding: 7px 10px; border-radius: 7px; cursor: pointer; }
.guide-toc button:hover { background: #131b27; color: #fff; }
.guide-toc button.on { background: rgba(56, 189, 248, .12); color: #fff; }
.guide-article { overflow-y: auto; padding: 30px 40px 50px; }
.guide-article h2 { font-size: 26px; margin: 0 0 6px; letter-spacing: -.02em; }
.guide-article h3 { font-size: 15px; margin: 26px 0 8px; color: #fff; }
.guide-article p, .guide-article li { color: var(--soft); }
.guide-article .lead { font-size: 16px; color: var(--text); }
.guide-article ul { padding-left: 20px; }
.guide-article li { margin: 5px 0; }
.diagram { font: 12.5px/1.55 var(--mono); background: #0a0f16; border: 1px solid var(--line); border-radius: var(--r); padding: 14px 16px; color: #b8f7cf; overflow-x: auto; }
.tbl { width: 100%; border-collapse: collapse; font-size: 13.5px; margin: 6px 0; }
.tbl th, .tbl td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--line); color: var(--soft); vertical-align: top; }
.tbl th { color: var(--muted); font: 600 11px var(--mono); text-transform: uppercase; letter-spacing: .08em; }
.callout { margin-top: 18px; padding: 12px 16px; border-radius: var(--r); background: rgba(251, 191, 36, .06); border: 1px solid rgba(251, 191, 36, .22); color: var(--text); }
.cards2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.mini { border: 1px solid var(--line); border-radius: var(--r); padding: 12px 14px; background: #111925; }
.mini p { margin: 4px 0 0; font-size: 13.5px; }
.x { position: absolute; top: 12px; right: 14px; width: 32px; height: 32px; border-radius: 8px; border: 1px solid var(--line2); background: var(--panel2); color: var(--soft); font-size: 20px; line-height: 1; cursor: pointer; }
.x:hover { color: #fff; }

/* field guide: learning path TOC, search, progress */
.guide-toc { display: flex; flex-direction: column; padding: 0; overflow: hidden; }
.gt-head { padding: 18px 12px 10px; border-bottom: 1px solid var(--line); display: grid; gap: 10px; flex: none; }
.gt-prog { display: grid; gap: 6px; font: 11.5px var(--mono); color: var(--muted); padding: 0 2px; }
.gt-prog b { color: var(--green); }
.gt-prog .bar { width: 100%; height: 5px; }
#guide-search { width: 100%; font: 13px var(--sans); padding: 8px 10px; background: #0b1018; color: #fff; border: 1px solid var(--line2); border-radius: 8px; }
#guide-search:focus { outline: none; border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(56, 189, 248, .12); }
#gt-list { overflow-y: auto; padding: 12px 12px 24px; flex: 1; min-height: 0; }
#gt-list h5:first-child { margin-top: 4px; }
.guide-toc #gt-list button { display: flex; align-items: flex-start; gap: 9px; padding: 6px 8px; line-height: 1.35; }
.gt-n { flex: none; width: 19px; height: 19px; margin-top: 0; border-radius: 50%; border: 1px solid var(--line2); display: grid; place-items: center; font: 600 10px var(--mono); color: var(--muted); }
.guide-toc button.read .gt-n { font-size: 0; border-color: rgba(74, 222, 128, .45); background: rgba(74, 222, 128, .1); }
.guide-toc button.read .gt-n::after { content: "✓"; font-size: 10.5px; color: var(--green); }
.guide-toc button.ref { margin-bottom: 6px; border: 1px dashed var(--line2); }
.guide-toc button.ref .gt-n { border: none; font-size: 12px; color: var(--amber); }
.gt-t small { display: block; font-size: 11px; color: var(--muted); }
.gt-none { color: var(--muted); font-size: 13px; padding: 0 8px; }

/* field guide: article extras */
.guide-article h3 { scroll-margin-top: 12px; }
.guide-article .diagram, .primer-body .diagram { max-width: 100%; }
.guide-article .diagram { white-space: pre-wrap; overflow-wrap: anywhere; }
.guide-article .xref { color: var(--cyan); cursor: pointer; background: none; border: none; padding: 0; font: inherit; text-decoration: underline; text-decoration-color: rgba(56, 189, 248, .35); text-underline-offset: 2px; }
.guide-article .xref:hover { text-decoration-color: var(--cyan); }
.guide-article .mistakes { margin-top: 18px; padding: 12px 16px; border-radius: var(--r); background: rgba(248, 113, 113, .05); border: 1px solid rgba(248, 113, 113, .22); }
.guide-article .mistakes h4, .guide-article .ingame h4 { margin: 0 0 6px; font: 600 11px var(--mono); text-transform: uppercase; letter-spacing: .12em; color: var(--red); }
.guide-article .mistakes ul, .guide-article .ingame ul { margin: 0; }
.guide-article .ingame { margin-top: 14px; padding: 12px 16px; border-radius: var(--r); background: rgba(56, 189, 248, .05); border: 1px solid rgba(56, 189, 248, .2); }
.guide-article .ingame h4 { color: var(--cyan); }
.guide-article .howto { display: grid; grid-template-columns: auto 1fr; gap: 6px 12px; align-items: baseline; margin: 8px 0; }
.g-sub { margin: -4px 0 12px; font-size: 13px; color: var(--muted) !important; }

/* "try it" buttons on runnable command lines */
.diagram.has-run { padding-left: 38px; }
.diagram .run { position: relative; }
.diagram .run:hover { background: rgba(74, 222, 128, .07); border-radius: 3px; box-shadow: 0 0 0 2px rgba(74, 222, 128, .07); }
.diagram .try { position: absolute; left: -27px; top: -1px; width: 19px; height: 19px; padding: 0; border-radius: 5px; border: 1px solid rgba(74, 222, 128, .38); background: rgba(74, 222, 128, .08); color: var(--green); font: 8.5px/17px var(--sans); text-align: center; cursor: pointer; transition: .15s; }
.diagram .try:hover { background: var(--green); color: #04110a; border-color: var(--green); }
.diagram .try.sent { background: var(--green); color: #04110a; }
.diagram .try.sent::before { content: "✓"; position: absolute; inset: 0; background: var(--green); border-radius: 4px; font-size: 11px; }
.diagram .ps2 { color: var(--muted); user-select: none; }
.primer-body .diagram.has-run { padding-left: 34px; }
.primer-body .diagram .try { left: -25px; width: 18px; height: 18px; line-height: 16px; }
.guide-pill { position: fixed; right: 18px; bottom: 18px; z-index: 45; display: flex; align-items: center; background: #172131; border: 1px solid rgba(56, 189, 248, .4); border-radius: 99px; box-shadow: 0 10px 30px rgba(0, 0, 0, .45); animation: pop .25s ease; overflow: hidden; }
.guide-pill[hidden] { display: none; }
.guide-pill button { background: none; border: none; color: var(--text); font: 500 13px var(--sans); cursor: pointer; padding: 9px 6px 9px 16px; max-width: 360px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.guide-pill .gp-back:hover { color: var(--cyan); }
.guide-pill .gp-x { padding: 9px 14px 9px 8px; color: var(--muted); font-size: 16px; }
.guide-pill .gp-x:hover { color: #fff; }

/* quizzes */
.g-quiz, .g-practice { margin-top: 34px; padding-top: 6px; border-top: 1px solid var(--line); }
.g-quiz > h3::before { content: "? "; color: var(--violet); }
.g-practice > h3::before { content: "› "; color: var(--green); }
.q { margin: 0 0 16px; padding: 14px 16px; border: 1px solid var(--line); border-radius: var(--r); background: #111925; }
.q-text { display: flex; gap: 10px; color: var(--text); font-weight: 500; margin-bottom: 10px; }
.q-text code { white-space: normal; }
.q-n { flex: none; width: 22px; height: 22px; border-radius: 50%; background: rgba(167, 139, 250, .15); color: var(--violet); font: 700 11.5px/22px var(--mono); text-align: center; }
.q-opts { display: grid; gap: 6px; }
.q-opt { display: flex; gap: 10px; align-items: baseline; text-align: left; width: 100%; padding: 8px 12px; border-radius: 8px; border: 1px solid var(--line2); background: #0f1620; color: var(--soft); font: 13.5px/1.5 var(--sans); cursor: pointer; transition: .12s; }
.q-opt code { white-space: normal; }
.q-opt:hover { border-color: #3d4f69; color: var(--text); }
.q-key { flex: none; font: 600 11px var(--mono); color: var(--muted); }
.q-opt.right { border-color: rgba(74, 222, 128, .6); background: rgba(74, 222, 128, .08); color: var(--text); }
.q-opt.right .q-key { color: var(--green); }
.q-opt.wrong { border-color: rgba(248, 113, 113, .5); background: rgba(248, 113, 113, .06); opacity: .8; }
.q-opt.wrong .q-key { color: var(--red); }
.q.done .q-opt:not(.right) { opacity: .55; cursor: default; }
.q-why { margin-top: 10px; padding: 9px 12px; border-radius: 8px; font-size: 13.5px; color: var(--soft); animation: fadein .2s ease; }
.q-why.ok { background: rgba(74, 222, 128, .06); border-left: 3px solid var(--green); }
.q-why.ok b { color: var(--green); }
.q-why.bad { background: rgba(248, 113, 113, .05); border-left: 3px solid var(--red); }
.q-why.bad b { color: var(--red); }
.q-why i { color: var(--muted); }

/* practice tasks */
.task { display: flex; gap: 12px; margin: 0 0 14px; padding: 14px 16px; border: 1px solid var(--line); border-radius: var(--r); background: #111925; }
.task-n { flex: none; width: 22px; height: 22px; border-radius: 6px; background: rgba(74, 222, 128, .12); color: var(--green); font: 700 11.5px/22px var(--mono); text-align: center; }
.task-body { flex: 1; min-width: 0; color: var(--text); }
.task-body > p:first-child { margin-top: 0; }
.sol { margin-top: 10px; }
.sol summary { cursor: pointer; color: var(--cyan); font-size: 13px; list-style: none; display: inline-flex; gap: 6px; align-items: center; }
.sol summary::-webkit-details-marker { display: none; }
.sol summary::before { content: "▸"; transition: transform .15s; }
.sol[open] summary::before { transform: rotate(90deg); }
.sol-body { margin-top: 8px; animation: fadein .2s ease; }
.sol-body .diagram { margin: 6px 0; }
.sol-body p { margin: 6px 0; }

/* previous / next */
.g-foot { display: flex; align-items: stretch; justify-content: space-between; gap: 10px; margin-top: 34px; padding-top: 18px; border-top: 1px solid var(--line); }
.g-nav { flex-direction: column; align-items: flex-start; gap: 1px; max-width: 42%; padding: 8px 14px; text-align: left; }
.g-nav small { font: 600 10px var(--mono); text-transform: uppercase; letter-spacing: .1em; color: var(--muted); }
.g-next { align-items: flex-end; text-align: right; border-color: rgba(56, 189, 248, .4); }
.g-next small { color: var(--cyan); }
.g-mark { align-self: center; }
.g-mark.done { color: var(--green); border-color: rgba(74, 222, 128, .35); }

.confirm { width: min(420px, 100%); padding: 24px 24px 0; }
.confirm h3 { margin: 0 0 6px; }
.confirm p { margin: 0; color: var(--soft); }
.confirm .db-actions { padding: 20px 0 22px; }

.toasts { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); z-index: 60; display: grid; gap: 8px; }
.toast { background: #1a2333; border: 1px solid var(--line2); color: var(--text); padding: 10px 16px; border-radius: 10px; box-shadow: 0 10px 30px rgba(0, 0, 0, .4); animation: pop .25s ease; font-size: 13.5px; }
.toast.err { border-color: #7f2a2a; }

/* confetti */
.confetti { position: fixed; inset: 0; pointer-events: none; z-index: 55; overflow: hidden; }
.confetti i { position: absolute; top: -12px; width: 8px; height: 12px; border-radius: 2px; animation: fall linear forwards; }
@keyframes fall { to { transform: translateY(105vh) rotate(720deg); opacity: .2; } }

@media (max-width: 1200px) { .layout { grid-template-columns: 230px 380px 1fr; } .progress .bar { width: 100px; } }
@media (max-width: 960px) {
  body { overflow: auto; }
  .layout { grid-template-columns: 1fr; grid-template-rows: auto auto 70vh; }
  .map { max-height: 260px; border-right: none; border-bottom: 1px solid var(--line); }
  .brief { border-right: none; }
  .top-actions .btn:not(#btn-guide) { display: none; }
  .two, .cards2 { grid-template-columns: 1fr; }
  .guide { grid-template-columns: 1fr; grid-template-rows: minmax(0, 32%) 1fr; }
  .guide-toc { border-right: none; border-bottom: 1px solid var(--line); }
  .guide-article { padding: 22px 20px 40px; }
  .g-nav { max-width: 48%; }
}

/* ---------- account chip + leaderboard ---------- */
.account { display: flex; align-items: center; gap: 8px; margin-left: 6px; padding-left: 12px; border-left: 1px solid var(--line); }
.account a.btn { text-decoration: none; }
.acct-name { font: 600 13px var(--sans); color: var(--soft); white-space: nowrap; }
.modal.board { width: min(640px, 100%); max-height: 86vh; overflow: auto; padding: 26px 28px 22px; }
.modal.board h3 { margin: 0 0 4px; font-size: 20px; }
.board-sub { color: var(--muted); margin: 0 0 16px; font-size: 13.5px; }
.board-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.board-table th { text-align: left; font: 600 11.5px var(--sans); text-transform: uppercase; letter-spacing: .06em; color: var(--muted); padding: 0 10px 8px; border-bottom: 1px solid var(--line); }
.board-table td { padding: 9px 10px; border-bottom: 1px solid #1a2331; }
.board-table .num { text-align: right; font-family: var(--mono); }
.board-table .pts { color: var(--green); font-weight: 700; }
.board-table .pos { width: 42px; font-family: var(--mono); color: var(--soft); }
.board-table .rk { color: var(--soft); font-size: 13px; }
.board-table tr.me td { background: rgba(74, 222, 128, .07); }
.board-table tr.gap td { text-align: center; color: var(--muted); border: 0; padding: 2px; }
.board-table small { color: var(--muted); }

/* ---------- login page ---------- */
body.auth-page { overflow: auto; display: block; min-height: 100vh;
  background: radial-gradient(1200px 600px at 15% -10%, rgba(74, 222, 128, .08), transparent 60%),
              radial-gradient(900px 500px at 110% 110%, rgba(56, 189, 248, .07), transparent 60%), var(--bg); }
.auth { min-height: 100vh; display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(320px, 420px); gap: 56px; align-items: center; max-width: 1080px; margin: 0 auto; padding: 48px 28px; }
.auth-pitch .brand { font-size: 22px; margin-bottom: 26px; }
.auth-pitch h1 { font-size: clamp(28px, 4vw, 42px); line-height: 1.12; letter-spacing: -.025em; margin: 0 0 14px; }
.auth-pitch > p { color: var(--soft); font-size: 16px; max-width: 34em; margin: 0 0 22px; }
.auth-pitch ul { list-style: none; padding: 0; margin: 22px 0 0; color: var(--soft); }
.auth-pitch li { padding: 4px 0 4px 26px; position: relative; }
.auth-pitch li::before { content: '✔'; color: var(--green); position: absolute; left: 0; }
.auth-term { background: #05080c; border: 1px solid var(--line2); border-radius: 12px; padding: 16px 18px; font-size: 13px; line-height: 1.65; color: #d7e0ea; overflow-x: auto; margin: 0; box-shadow: 0 20px 60px rgba(0, 0, 0, .45); }
.auth-term .p { color: var(--green); }
.auth-term .e { color: var(--red); }
.auth-term .ok { color: var(--cyan); }
.auth-term .cm { color: var(--muted); }
.auth-card { background: var(--panel); border: 1px solid var(--line2); border-radius: 16px; padding: 26px; box-shadow: 0 30px 80px rgba(0, 0, 0, .5); }
.auth-tabs { display: grid; grid-template-columns: 1fr 1fr; background: var(--bg2); border: 1px solid var(--line); border-radius: 10px; padding: 4px; margin-bottom: 20px; }
.auth-tabs button { font: 600 13.5px var(--sans); color: var(--muted); background: none; border: 0; border-radius: 7px; padding: 8px; cursor: pointer; }
.auth-tabs button.on { background: var(--panel2); color: var(--text); box-shadow: inset 0 0 0 1px var(--line2); }
.auth-card label { display: block; font: 600 12.5px var(--sans); color: var(--soft); margin-bottom: 14px; }
.auth-card label[hidden] { display: none; }
.auth-card input { display: block; width: 100%; margin-top: 6px; font: 15px var(--mono); color: var(--text); background: var(--bg2); border: 1px solid var(--line2); border-radius: 8px; padding: 10px 12px; outline: none; transition: .15s; }
.auth-card input:focus { border-color: var(--green-d); box-shadow: 0 0 0 3px rgba(74, 222, 128, .15); }
.auth-help { color: var(--muted); font-size: 12.5px; margin: 0 0 12px; }
.auth-error { color: var(--red); background: rgba(248, 113, 113, .08); border: 1px solid rgba(248, 113, 113, .3); border-radius: 8px; padding: 8px 12px; font-size: 13px; margin: 0 0 12px; }
.auth-submit { width: 100%; justify-content: center; padding: 11px; font-size: 14.5px; }
.auth-guest { text-align: center; margin: 18px 0 0; font-size: 13.5px; }
.auth-guest a { color: var(--cyan); text-decoration: none; font-weight: 600; }
.auth-guest small { color: var(--muted); font-size: 12px; }
@media (max-width: 820px) { .auth { grid-template-columns: 1fr; gap: 32px; } .auth-term { display: none; } }