/* =====================================================================
   Codestep design system
   Blue = action & brand, Yellow = reward & progress, Navy = ink.
   Flat colour, chunky bottom edges, warm paper background. No gradients.
   ===================================================================== */
:root {
  --blue: #2f6bff; --blue-d: #1b4fd6; --blue-l: #e4ecff;
  --yellow: #ffc931; --yellow-d: #e0a400; --yellow-l: #fff2c4;
  --orange: #ff8a1f;
  --ink: #0b1b3a;

  --bg: #fbf7ec;
  --surface: #ffffff;
  --surface-2: #f6f1e3;
  --surface-3: #ece6d2;
  --border: #e6dfc9;
  --border-2: #d4cab0;
  --text: #0b1b3a;
  --text-2: #4b5a7c;
  --text-3: #8591ae;
  --accent: var(--blue);

  --good: #159a68; --good-bg: #dff5ea; --good-d: #0f7a52;
  --bad: #e03a45; --bad-bg: #fde6e7; --bad-d: #b82a34;
  --warn: #c98a00; --info: #2f6bff;

  --r: 20px;
  --font: "Figtree", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --display: "Bricolage Grotesque", "Figtree", ui-sans-serif, system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  /* code window is navy in both themes */
  --code-bg: #0d1a3f; --code-bar: #13224d; --code-line: #243566;
  --s-kw: #ffc931; --s-def: #8dbbff; --s-str: #9be3c4; --s-num: #ff9f4a;
  --s-com: #6f7fae; --s-bi: #ffd98a; --s-op: #8fa3d6; --s-var: #eaf0ff; --s-var2: #b9d1ff;
}
:root[data-theme="dark"] {
  --blue: #4f86ff; --blue-d: #2c5ed4; --blue-l: #172a63;
  --yellow: #ffcf3f; --yellow-d: #d9a400; --yellow-l: #3a3210;
  --bg: #0a1230;
  --surface: #111c44;
  --surface-2: #17245a;
  --surface-3: #213271;
  --border: #22336e;
  --border-2: #34499a;
  --text: #f2f5ff;
  --text-2: #a9b6dd;
  --text-3: #6e7eab;
  --good: #3ddc97; --good-bg: #123a37; --good-d: #1b9a68;
  --bad: #ff6b74; --bad-bg: #44192f; --bad-d: #c24454;
  --warn: #ffcf3f; --info: #7fb0ff;
  --code-bg: #0b1638; --code-bar: #101d47; --code-line: #22336e;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; font-family: var(--font); font-weight: 500; background: var(--bg); color: var(--text); -webkit-font-smoothing: antialiased; font-size: 16px; line-height: 1.55; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
h1, h2, h3, h4, p { margin: 0; }
h1, h2, h3 { font-family: var(--display); letter-spacing: -.02em; font-weight: 700; line-height: 1.15; }
code, pre, kbd { font-family: var(--mono); }
code { background: var(--surface-3); padding: .1em .4em; border-radius: 6px; font-size: .86em; }
svg { fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.ico { width: 1.25em; height: 1.25em; flex: none; vertical-align: -.22em; }
.ico.fill { fill: currentColor; stroke-width: 1.2; }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; border-radius: 10px; }
::selection { background: var(--yellow); color: var(--ink); }
[hidden] { display: none !important; }
* { scrollbar-width: thin; scrollbar-color: var(--border-2) transparent; }

/* ---------- shell ---------- */
.shell { display: grid; grid-template-columns: 244px minmax(0, 1fr); min-height: 100vh; }
.sidebar { position: sticky; top: 0; height: 100vh; padding: 24px 16px 20px; display: flex; flex-direction: column; gap: 30px; border-right: 2px solid var(--border); background: var(--bg); }
.brand { display: flex; align-items: center; gap: 11px; padding: 0 8px; }
.brand-mark { width: 40px; height: 40px; flex: none; }
.brand-mark svg { width: 100%; height: 100%; stroke: none; fill: initial; }
.brand-name { font-family: var(--display); font-weight: 800; font-size: 25px; letter-spacing: -.04em; }
.nav { display: flex; flex-direction: column; gap: 6px; }
.nav a { display: flex; align-items: center; gap: 14px; padding: 11px 14px; border-radius: 14px; font-weight: 700; font-size: 15px; letter-spacing: .02em; text-transform: uppercase; color: var(--text-2); border: 2px solid transparent; transition: background .12s; }
.nav a svg { width: 24px; height: 24px; }
.nav a:hover { background: var(--surface-2); }
.nav a.active { background: var(--blue-l); border-color: var(--blue); color: var(--blue); }
.side-foot { margin-top: auto; display: flex; flex-direction: column; gap: 12px; }
.side-actions { display: flex; gap: 8px; }
.icon-btn { width: 42px; height: 42px; border-radius: 13px; display: grid; place-items: center; background: var(--surface); border: 2px solid var(--border); border-bottom-width: 4px; color: var(--text-2); transition: transform .08s; }
.icon-btn:hover { color: var(--text); border-color: var(--border-2); }
.icon-btn:active { transform: translateY(2px); border-bottom-width: 2px; }
.icon-btn svg { width: 20px; height: 20px; }
.runtime { display: flex; align-items: center; gap: 10px; font-size: 13px; font-weight: 700; color: var(--text-2); padding: 10px 12px; background: var(--surface); border: 2px solid var(--border); border-radius: 13px; }
.runtime i { width: 10px; height: 10px; border-radius: 50%; background: var(--yellow); flex: none; animation: blinkdot 1.1s infinite; }
.runtime.ready i { background: var(--good); animation: none; }
.runtime.error i { background: var(--bad); animation: none; }
@keyframes blinkdot { 50% { opacity: .3; } }
.main { min-width: 0; }
.bottomnav { display: none; }

/* ---------- topbar & stats ---------- */
.topbar { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 8px; padding: 14px 32px; background: var(--bg); border-bottom: 2px solid var(--border); }
.topbar h1 { font-size: 22px; margin-right: auto; }
.stat { display: flex; align-items: center; gap: 7px; padding: 7px 12px; border-radius: 12px; font-weight: 800; font-size: 16px; font-variant-numeric: tabular-nums; }
.stat .ico { width: 24px; height: 24px; }
.stat.fire { color: var(--orange); } .stat.xp { color: var(--yellow-d); } .stat.lvl { color: var(--blue); }
:root[data-theme="dark"] .stat.xp { color: var(--yellow); }
.stat.bump { animation: bump .45s; }
@keyframes bump { 40% { transform: scale(1.18); } }

/* ---------- learn ---------- */
.learn { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 40px; padding: 28px 32px 60px; max-width: 1120px; margin: 0 auto; }
.path { display: flex; flex-direction: column; align-items: center; min-width: 0; }
.unit { width: 100%; max-width: 580px; }
.unit-banner { position: relative; overflow: hidden; border-radius: var(--r); padding: 20px 22px 20px; margin: 10px 0 20px; color: var(--on); background: var(--c1); border-bottom: 6px solid var(--c-d); }
.unit-banner .deco { fill: currentColor; position: absolute; right: -10px; top: -10px; width: 190px; height: 190px; opacity: .22; color: var(--on); stroke: none; pointer-events: none; }
.unit-banner small { text-transform: uppercase; letter-spacing: .14em; font-weight: 800; font-size: 11.5px; opacity: .8; }
.unit-banner h2 { font-size: 28px; font-weight: 800; letter-spacing: -.03em; margin: 3px 0 2px; position: relative; }
.unit-banner p { font-size: 15px; opacity: .88; position: relative; max-width: 380px; }
.unit-banner .bar { margin-top: 16px; height: 10px; border-radius: 99px; background: rgba(0, 0, 0, .16); overflow: hidden; max-width: 320px; position: relative; }
.unit-banner .bar i { display: block; height: 100%; background: var(--on); border-radius: 99px; transition: width .6s cubic-bezier(.2, .8, .2, 1); }
.u-blue { --c1: #2f6bff; --c-d: #1b4fd6; --on: #fff; }
.u-yellow { --c1: #ffc931; --c-d: #e0a400; --on: #0b1b3a; }
.u-sky { --c1: #8dbbff; --c-d: #5f98ee; --on: #0b1b3a; }
.u-orange { --c1: #ff9f1c; --c-d: #d97c00; --on: #0b1b3a; }
.u-purple { --c1: #8b5cf6; --c-d: #6d3fd9; --on: #fff; }
.u-green { --c1: #2fb86b; --c-d: #1f8f4f; --on: #fff; }
.u-pink { --c1: #ec4899; --c-d: #c42d7b; --on: #fff; }
.u-navy { --c1: #26409a; --c-d: #162a6c; --on: #fff; }
:root[data-theme="dark"] .u-navy { --c1: #3558c9; --c-d: #223d97; }

/* learning path: rows of skills that can be done in any order, leading to one goal */
.goal-banner { width: 100%; max-width: 580px; border-radius: var(--r); padding: 20px 22px; margin: 10px 0 8px; color: var(--on); background: var(--c1); border-bottom: 6px solid var(--c-d); }
.goal-banner small { text-transform: uppercase; letter-spacing: .14em; font-weight: 800; font-size: 11.5px; opacity: .8; }
.goal-banner h2 { font-size: 26px; font-weight: 800; letter-spacing: -.03em; margin: 3px 0 2px; }
.goal-banner p { font-size: 15px; opacity: .88; }
.goal-banner .bar { margin-top: 14px; height: 10px; border-radius: 99px; background: rgba(0, 0, 0, .16); overflow: hidden; max-width: 320px; }
.goal-banner .bar i { display: block; height: 100%; background: var(--on); border-radius: 99px; transition: width .6s cubic-bezier(.2, .8, .2, 1); }
.goal-banner span { display: block; font-size: 13px; font-weight: 700; opacity: .85; margin-top: 6px; }
.legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px 16px; max-width: 580px; margin: 10px 0 4px; font-size: 12.5px; font-weight: 700; color: var(--text-2); }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { width: 11px; height: 11px; border-radius: 50%; background: var(--c1); box-shadow: 0 2px 0 var(--c-d); }
.tier { width: 100%; max-width: 580px; display: flex; flex-direction: column; align-items: center; padding: 18px 0 8px; position: relative; }
.tier + .tier::before { content: ""; position: absolute; top: -2px; left: 50%; width: 4px; height: 20px; margin-left: -2px; border-radius: 2px; background: var(--border-2); }
.tier-head { text-align: center; margin-bottom: 8px; }
.tier-head small { display: block; text-transform: uppercase; letter-spacing: .14em; font-weight: 800; font-size: 11px; color: var(--text-3); }
.tier-head span { font-size: 13px; color: var(--text-2); font-weight: 600; }
.tier-nodes { display: flex; flex-wrap: wrap; justify-content: center; gap: 4px 26px; width: 100%; }
.tier .node-wrap { transform: none; margin: 30px 0 34px; display: flex; flex-direction: column; align-items: center; }
.tier .node-label { display: block; position: absolute; top: calc(100% + 12px); left: 50%; right: auto; transform: translateX(-50%); width: 120px; text-align: center; white-space: normal; line-height: 1.2; }
.tier .node-pop { margin-top: 4px; }
.nodes { display: flex; flex-direction: column; align-items: center; padding-bottom: 34px; }
.node-row { display: flex; flex-direction: column; align-items: center; width: 100%; }
.node-wrap { position: relative; transform: translateX(var(--dx)); margin: 14px 0; }
.node { width: 82px; height: 82px; border-radius: 50%; display: grid; place-items: center; position: relative; background: var(--c1); color: var(--on); box-shadow: 0 7px 0 var(--c-d); transition: transform .1s, box-shadow .1s; }
.node svg { width: 36px; height: 36px; stroke-width: 2.2; }
.node:hover { transform: translateY(-2px); box-shadow: 0 9px 0 var(--c-d); }
.node:active { transform: translateY(6px); box-shadow: 0 1px 0 var(--c-d); }
.node .badge { position: absolute; right: -6px; top: -6px; width: 30px; height: 30px; border-radius: 50%; background: var(--ink); color: #fff; border: 3px solid var(--bg); display: grid; place-items: center; }
.node .badge svg { width: 15px; height: 15px; stroke-width: 3.2; }
:root[data-theme="dark"] .node .badge { background: var(--yellow); color: var(--ink); }
.node.locked { background: var(--surface-3); color: var(--text-3); box-shadow: 0 7px 0 var(--border-2); cursor: not-allowed; }
.node.locked svg { width: 30px; height: 30px; }
.node.current::before { content: ""; position: absolute; inset: -9px; border-radius: 50%; border: 3px solid var(--c1); animation: ring 2s ease-out infinite; }
@keyframes ring { 0% { transform: scale(.94); opacity: .9; } 100% { transform: scale(1.24); opacity: 0; } }
.node-wrap:has(.start-tag) { margin-top: 44px; }
.start-tag { position: absolute; left: 50%; top: -38px; transform: translateX(-50%); background: var(--yellow); color: var(--ink); font-weight: 800; font-size: 12px; letter-spacing: .1em; padding: 4px 13px; border-radius: 11px; white-space: nowrap; border-bottom: 3px solid var(--yellow-d); animation: hop 1.6s ease-in-out infinite; }
.start-tag::after { content: ""; position: absolute; left: 50%; bottom: -6px; width: 11px; height: 11px; background: var(--yellow); transform: translateX(-50%) rotate(45deg); border-radius: 2px; }
@keyframes hop { 50% { transform: translate(-50%, -4px); } }
.node-label { position: absolute; top: 50%; left: calc(100% + 16px); transform: translateY(-50%); font-weight: 700; font-size: 14px; color: var(--text-2); white-space: nowrap; pointer-events: none; display: none; }
@media (min-width: 640px) { .node-label { display: block; } .node-wrap[style*="-"] .node-label { left: auto; right: calc(100% + 16px); } }

.node-pop { width: min(310px, 92%); background: var(--surface); border: 2px solid var(--border); border-bottom-width: 5px; border-radius: 18px; padding: 16px 18px; text-align: center; position: relative; margin-bottom: 8px; animation: pop .2s ease-out; }
.node-pop::before { content: ""; position: absolute; top: -9px; left: 50%; width: 14px; height: 14px; background: var(--surface); border-left: 2px solid var(--border); border-top: 2px solid var(--border); transform: translateX(-50%) rotate(45deg); border-radius: 3px 0 0 0; }
.node-pop h3 { font-size: 19px; }
.node-pop p { color: var(--text-2); font-size: 14.5px; margin: 3px 0 12px; }
.node-pop .meta { display: flex; justify-content: center; gap: 6px; margin-bottom: 14px; flex-wrap: wrap; }
.chip { font-size: 12px; font-weight: 700; padding: 3px 10px; border-radius: 99px; background: var(--surface-2); color: var(--text-2); border: 1.5px solid var(--border); }
@keyframes pop { from { opacity: 0; transform: translateY(-6px); } }

/* rail */
.rail { display: flex; flex-direction: column; gap: 16px; position: sticky; top: 88px; align-self: start; }
.card { background: var(--surface); border: 2px solid var(--border); border-bottom-width: 4px; border-radius: var(--r); padding: 18px; }
.card h3 { font-family: var(--font); font-size: 12px; text-transform: uppercase; letter-spacing: .12em; color: var(--text-3); font-weight: 800; margin-bottom: 14px; }
.goal { display: flex; align-items: center; gap: 16px; }
.ring { position: relative; width: 86px; height: 86px; flex: none; }
.ring svg { width: 100%; height: 100%; transform: rotate(-90deg); stroke-width: 10; }
.ring .trk { stroke: var(--surface-3); } .ring .val { stroke: var(--yellow); transition: stroke-dashoffset .8s cubic-bezier(.2, .8, .2, 1); }
.ring b { position: absolute; inset: 0; display: grid; place-items: center; font-family: var(--display); font-size: 22px; font-weight: 800; }
.goal p { color: var(--text-2); font-size: 14px; line-height: 1.4; } .goal p strong { color: var(--text); display: block; font-size: 16px; margin-bottom: 2px; }
.lvl-top { display: flex; justify-content: space-between; align-items: baseline; font-weight: 800; font-family: var(--display); font-size: 17px; }
.lvl-top span { color: var(--text-2); font-weight: 600; font-size: 13px; font-family: var(--font); }
.lvl-bar { height: 12px; background: var(--surface-3); border-radius: 99px; overflow: hidden; margin: 10px 0 12px; }
.lvl-bar i { display: block; height: 100%; background: var(--blue); border-radius: 99px; transition: width .6s; }
.week { display: flex; justify-content: space-between; }
.week div { display: flex; flex-direction: column; align-items: center; gap: 7px; font-size: 11.5px; color: var(--text-3); font-weight: 800; }
.week i { width: 30px; height: 30px; border-radius: 50%; background: var(--surface-3); display: grid; place-items: center; color: #fff; }
.week i .ico { width: 16px; height: 16px; }
.week .on i { background: var(--orange); }
.week .today i { outline: 2.5px solid var(--blue); outline-offset: 2px; }
.mascotcard { display: flex; align-items: center; gap: 14px; }
.mascotcard p { color: var(--text-2); font-size: 14px; line-height: 1.4; } .mascotcard strong { display: block; color: var(--text); font-size: 16px; font-family: var(--display); }
.greet { display: none; margin-bottom: 20px; width: 100%; max-width: 580px; }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 22px; border-radius: 14px; font-weight: 800; font-size: 15px; letter-spacing: .02em; border: 2px solid transparent; border-bottom-width: 5px; transition: transform .08s, filter .12s; white-space: nowrap; }
.btn:disabled { opacity: .5; cursor: not-allowed; filter: grayscale(.4); }
.btn:not(:disabled):active { transform: translateY(3px); border-bottom-width: 2px; margin-top: 3px; }
.btn-primary { color: #fff; background: var(--blue); border-color: var(--blue-d); }
.btn-primary:not(:disabled):hover { filter: brightness(1.06); }
.btn-good { color: #fff; background: var(--good); border-color: var(--good-d); }
.btn-bad { color: #fff; background: var(--bad); border-color: var(--bad-d); }
.btn-ghost { background: var(--surface); border-color: var(--border); border-bottom-color: var(--border-2); color: var(--text); }
.btn-ghost:not(:disabled):hover { background: var(--surface-2); }
.btn-sm { padding: 8px 14px; font-size: 13.5px; border-radius: 12px; border-bottom-width: 4px; }
.btn-block { width: 100%; }
.kbd { font-family: var(--mono); font-size: 11px; font-weight: 600; padding: 1px 6px; border-radius: 6px; background: rgba(255, 255, 255, .22); letter-spacing: 0; }
.btn-ghost .kbd { background: var(--surface-3); }

/* ---------- lesson ---------- */
.lesson-root { position: fixed; inset: 0; z-index: 50; background: var(--bg); display: flex; flex-direction: column; animation: fade .2s; }
@keyframes fade { from { opacity: 0; } }
.l-top { display: flex; align-items: center; gap: 16px; padding: 14px 24px; max-width: 1200px; width: 100%; margin: 0 auto; }
.l-close { width: 40px; height: 40px; border-radius: 12px; color: var(--text-3); display: grid; place-items: center; flex: none; }
.l-close:hover { background: var(--surface-2); color: var(--text); }
.l-close svg { width: 24px; height: 24px; stroke-width: 2.6; }
.l-progress { flex: 1; display: flex; gap: 6px; }
.l-progress i { flex: 1; height: 14px; border-radius: 99px; background: var(--surface-3); position: relative; overflow: hidden; }
.l-progress i::after { content: ""; position: absolute; inset: 0; background: var(--yellow); transform: translateX(-101%); transition: transform .5s cubic-bezier(.2, .8, .2, 1); border-radius: 99px; }
.l-progress i::before { content: ""; position: absolute; left: 8px; right: 8px; top: 3px; height: 3px; border-radius: 3px; background: rgba(255, 255, 255, .45); z-index: 1; opacity: 0; transition: opacity .3s .3s; }
.l-progress i.done::after { transform: none; } .l-progress i.done::before { opacity: 1; }
.l-progress i.cur::after { transform: translateX(-88%); opacity: .55; }
.l-body { flex: 1; min-height: 0; overflow: auto; padding: 10px 24px 28px; }
.l-wrap { max-width: 740px; margin: 0 auto; animation: slidein .3s cubic-bezier(.2, .9, .3, 1); }
.l-wrap.wide { max-width: 1200px; height: 100%; }
@keyframes slidein { from { opacity: 0; transform: translateY(12px); } }
.l-foot { border-top: 2px solid var(--border); background: var(--bg); padding: 16px 24px calc(16px + env(safe-area-inset-bottom)); }
.l-foot-in { max-width: 1200px; margin: 0 auto; display: flex; align-items: center; gap: 12px; min-height: 56px; }
.l-foot-in .grow { flex: 1; }
.l-foot.good { background: var(--good-bg); border-top-color: var(--good); }
.l-foot.bad { background: var(--bad-bg); border-top-color: var(--bad); }
.fb { display: flex; align-items: center; gap: 14px; flex: 1; min-width: 0; animation: slidein .22s; }
.fb h4 { font-family: var(--display); font-size: 21px; font-weight: 800; letter-spacing: -.02em; }
.good .fb h4 { color: var(--good); } .bad .fb h4 { color: var(--bad); }
.fb p { font-size: 15px; color: var(--text); opacity: .85; line-height: 1.4; }
.fb-text { min-width: 0; }
.fb-mascot { flex: none; width: 60px; }

.learn-card { background: var(--surface); border: 2px solid var(--border); border-bottom-width: 6px; border-radius: 26px; padding: 32px 36px; }
.kicker { font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .14em; color: var(--blue); }
.learn-card h2 { font-size: 34px; letter-spacing: -.03em; margin: 6px 0 14px; font-weight: 800; }
.prose p { margin: 0 0 12px; color: var(--text-2); font-size: 17px; line-height: 1.6; }
.prose p b, .prose li b { color: var(--text); font-weight: 800; }
.prose ul, .prose ol { color: var(--text-2); padding-left: 22px; margin: 0 0 12px; font-size: 17px; }
.prose li { margin-bottom: 6px; }
.prose pre, .codeblock { background: var(--code-bg); border-radius: 16px; padding: 16px 18px; margin: 0 0 14px; overflow: auto; font-size: 14px; line-height: 1.7; color: var(--s-var); }
.prose pre code { background: none; padding: 0; font-size: inherit; color: inherit; }
.prose code { color: var(--blue-d); background: var(--blue-l); font-weight: 600; }
:root[data-theme="dark"] .prose code { color: var(--yellow); background: var(--surface-3); }
.tbl { width: 100%; border-collapse: collapse; margin: 6px 0 4px; font-size: 14.5px; }
.tbl th, .tbl td { text-align: left; padding: 9px 10px; border-bottom: 2px solid var(--border); color: var(--text-2); }
.tbl th { color: var(--text-3); font-size: 11.5px; text-transform: uppercase; letter-spacing: .1em; font-weight: 800; }
.tbl td:first-child { font-family: var(--mono); color: var(--text); font-weight: 700; }

/* mascot */
.mascot { display: inline-block; flex: none; line-height: 0; animation: mascotfloat 3.4s ease-in-out infinite; }
.mascot svg { width: 100%; height: auto; display: block; overflow: visible; fill: currentColor; stroke: none; stroke-width: 1; }
.mascot .ear { transform-box: fill-box; transform-origin: 50% 85%; animation: earwig 7s ease-in-out infinite; } .mascot .ear.r { animation-delay: -3s; }
.mascot .eye { transform-box: fill-box; transform-origin: center; animation: blink 4.6s infinite; }
/* the panda's black fur would vanish on navy, so on dark surfaces (dark theme, code panes) ears and paws get a lighter fill and a rim */
:root[data-theme="dark"] .mascot .fur, .pane .mascot .fur { fill: #15245b; stroke: #7f97e6; }
:root[data-theme="dark"] .mascot .paw, .pane .mascot .paw { stroke: #7f97e6; }
:root[data-theme="dark"] .mascot .ear-in, .pane .mascot .ear-in { fill: #3a549f; }
.mascot-cheer { animation: mascotjump .6s cubic-bezier(.3, 1.6, .5, 1) infinite alternate; }
.mascot-oops { animation: mascotshake .5s 1; }
@keyframes mascotfloat { 50% { transform: translateY(-4px); } }
@keyframes mascotjump { to { transform: translateY(-12px) rotate(3deg); } }
@keyframes mascotshake { 25% { transform: translateX(-5px) rotate(-3deg); } 75% { transform: translateX(5px) rotate(3deg); } }
@keyframes earwig { 0%, 90%, 100% { transform: rotate(0); } 93% { transform: rotate(-9deg); } 96% { transform: rotate(5deg); } }
@keyframes blink { 0%, 93%, 100% { transform: scaleY(1); } 96% { transform: scaleY(.08); } }
.mascotsay { display: flex; align-items: center; gap: 14px; }
.bubble { position: relative; background: var(--surface); border: 2px solid var(--border-2); border-radius: 16px; padding: 10px 16px; font-weight: 700; font-size: 15.5px; color: var(--text); line-height: 1.4; }
.bubble::before { content: ""; position: absolute; left: -8px; top: 50%; width: 13px; height: 13px; background: var(--surface); border-left: 2px solid var(--border-2); border-bottom: 2px solid var(--border-2); transform: translateY(-50%) rotate(45deg); border-radius: 0 0 0 3px; }
.learn-card .mascotsay { margin: 0 0 18px; } .quiz .mascotsay { margin-top: 6px; }

/* quiz */
.quiz h2 { font-size: 29px; font-weight: 800; letter-spacing: -.03em; margin: 18px 0 16px; }
.opts { display: grid; gap: 12px; margin-top: 18px; }
.opt { display: flex; align-items: center; gap: 14px; text-align: left; padding: 15px 18px; border-radius: 16px; background: var(--surface); border: 2px solid var(--border); border-bottom-width: 5px; font-weight: 700; font-size: 17px; transition: transform .08s, background .12s; }
.opt:hover:not(:disabled) { background: var(--surface-2); }
.opt:active:not(:disabled) { transform: translateY(3px); border-bottom-width: 2px; margin-top: 3px; margin-bottom: -3px; }
.opt .k { width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; font-size: 13px; font-weight: 800; border: 2px solid var(--border-2); color: var(--text-3); flex: none; }
.opt .t { font-family: var(--mono); font-size: 15px; font-weight: 600; }
.opt.sel { border-color: var(--blue); background: var(--blue-l); color: var(--blue); }
.opt.sel .k { border-color: var(--blue); background: var(--blue); color: #fff; }
.opt.right { border-color: var(--good); background: var(--good-bg); color: var(--good); } .opt.right .k { background: var(--good); border-color: var(--good); color: #fff; }
.opt.wrong { border-color: var(--bad); background: var(--bad-bg); color: var(--bad); animation: shake .4s; } .opt.wrong .k { background: var(--bad); border-color: var(--bad); color: #fff; }
.opt:disabled { cursor: default; }
@keyframes shake { 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }
.predict-box { font-family: var(--mono); font-size: 15px; line-height: 1.6; margin-top: 14px; resize: vertical; min-height: 90px; }
.kbd-hint { font-size: 13px; color: var(--text-3); font-weight: 700; padding-top: 16px; text-align: center; }
.kbd-hint kbd { background: var(--surface); border: 2px solid var(--border-2); border-bottom-width: 3px; border-radius: 7px; padding: 1px 7px; font-size: 11.5px; color: var(--text-2); }
.l-foot-in > .kbd-hint { padding-top: 0; }

/* code step */
.code-step { display: grid; grid-template-columns: minmax(280px, 400px) minmax(0, 1fr); gap: 22px; height: 100%; min-height: 0; }
.task { display: flex; flex-direction: column; gap: 14px; min-height: 0; overflow: auto; padding-bottom: 4px; }
.task .card { padding: 22px; }
.task h2 { font-size: 26px; font-weight: 800; margin: 4px 0 12px; }
.task .prose p { font-size: 16px; }
.hintbox { display: flex; gap: 12px; align-items: center; border: 2px solid var(--yellow-d); background: var(--yellow-l); border-radius: 16px; padding: 12px 14px; font-size: 15px; color: var(--ink); animation: slidein .25s; }
:root[data-theme="dark"] .hintbox { color: var(--text); border-color: var(--yellow); }
.hintbox b { font-weight: 800; } .hintbox > span:last-child { flex: 1; }
.hintbox .mascot { width: 46px; animation: none; }

/* dark "code window" (same in both themes) */
.ide, .pg-out {
  --text: #eaf0ff; --text-2: #a9b7dd; --text-3: #6f7fae; --surface: var(--code-bar); --surface-2: #192b5e; --surface-3: #233773;
  --border: var(--code-line); --border-2: #32487f; --bad: #ff7a82; --bad-bg: rgba(255, 107, 116, .13); --good: #3ddc97; --blue-l: #172a63; --blue: #6a9bff;
  color: var(--text);
}
.ide { display: flex; flex-direction: column; min-height: 0; border-radius: 22px; overflow: hidden; background: var(--code-bg); border-bottom: 6px solid #060e28; }
.ide-bar { display: flex; align-items: center; gap: 10px; padding: 10px 16px; background: var(--code-bar); font-size: 13px; color: var(--text-3); font-family: var(--mono); font-weight: 500; }
.dots { display: flex; gap: 6px; } .dots i { width: 11px; height: 11px; border-radius: 50%; background: var(--yellow); } .dots i:nth-child(2) { background: var(--blue); } .dots i:nth-child(3) { background: #8dbbff; }
.ide-bar .sp { flex: 1; }
.ide-ed { flex: 1 1 55%; min-height: 160px; position: relative; }
.ide-ed .CodeMirror { position: absolute; inset: 0; height: auto; }
.ide-console { flex: 1 1 45%; min-height: 150px; display: flex; flex-direction: column; background: var(--code-bar); border-top: 2px solid var(--code-line); }
.tabs { display: flex; align-items: center; gap: 2px; padding: 4px 12px 0; }
.tab { padding: 8px 12px; font-size: 13px; font-weight: 800; color: var(--text-3); border-bottom: 3px solid transparent; display: flex; gap: 7px; align-items: center; letter-spacing: .02em; }
.tab:hover { color: var(--text); }
.tab.on { color: var(--text); border-color: var(--yellow); }
.tab .n { font-size: 11px; padding: 0 7px; border-radius: 99px; background: var(--surface-3); line-height: 18px; font-weight: 800; }
.tab .n.err { background: var(--bad); color: #fff; } .tab .n.warn { background: var(--yellow); color: var(--ink); } .tab .n.ok { background: var(--good); color: #052b1c; }
.tabs .sp { flex: 1; }
.tabs .prof { display: flex; gap: 8px; padding-bottom: 6px; }
.tabs .prof span { font-size: 12px; font-family: var(--mono); font-weight: 600; padding: 2px 10px; border-radius: 99px; background: rgba(255, 201, 49, .16); color: var(--yellow); display: inline-flex; align-items: center; gap: 6px; }
.pane { flex: 1; overflow: auto; padding: 12px 18px; font-family: var(--mono); font-size: 13.5px; min-height: 0; }
.pane pre { margin: 0; white-space: pre-wrap; word-break: break-word; line-height: 1.65; }
.pane .dim { color: var(--text-3); font-family: var(--font); }
.pane .empty { display: flex; align-items: center; gap: 14px; color: var(--text-3); font-family: var(--font); font-weight: 600; }
.pane .empty .mascot { width: 54px; animation: none; } .pane .empty b { color: var(--text-2); }
.errbox { margin-top: 10px; padding: 11px 14px; border-radius: 12px; background: var(--bad-bg); border: 2px solid var(--bad); color: var(--bad); font-family: var(--font); font-size: 14px; font-weight: 600; }
.errbox b { font-family: var(--mono); } .errbox .h { color: var(--text-2); margin-top: 4px; font-size: 13px; font-weight: 500; }
.errbox a { text-decoration: underline; cursor: pointer; }
.running { display: flex; align-items: center; gap: 10px; color: var(--text-2); font-family: var(--font); font-weight: 600; }
.spin { width: 15px; height: 15px; border-radius: 50%; border: 3px solid var(--surface-3); border-top-color: var(--yellow); animation: spin .7s linear infinite; display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }
.prob { display: flex; gap: 10px; align-items: baseline; padding: 8px 8px; border-radius: 10px; cursor: pointer; font-family: var(--font); font-size: 14px; font-weight: 500; }
.prob:hover { background: var(--surface-2); }
.prob .sev { width: 9px; height: 9px; border-radius: 50%; flex: none; transform: translateY(-1px); }
.prob .sev.error { background: var(--bad); } .prob .sev.warning { background: var(--yellow); } .prob .sev.info { background: #8dbbff; }
.prob .loc { font-family: var(--mono); color: var(--text-3); font-size: 12px; flex: none; }
.prob .rule { margin-left: auto; font-family: var(--mono); font-size: 11px; color: var(--text-3); flex: none; padding-left: 8px; }
.clean { display: flex; align-items: center; gap: 10px; color: var(--good); font-family: var(--font); font-weight: 700; padding: 6px 4px; }

/* completion */
.done-screen { text-align: center; padding: 30px 0 10px; }
.trophy { display: inline-block; }
.done-screen h2 { font-size: 42px; font-weight: 800; letter-spacing: -.04em; margin: 14px 0 6px; }
.done-screen > p { color: var(--text-2); font-size: 17px; }
.done-stats { display: flex; gap: 14px; justify-content: center; margin-top: 30px; flex-wrap: wrap; }
.done-stats div { --c: var(--blue); min-width: 150px; border-radius: 18px; border: 2px solid var(--c); background: var(--surface); overflow: hidden; }
.done-stats small { display: block; background: var(--c); color: #fff; font-size: 11.5px; text-transform: uppercase; letter-spacing: .12em; font-weight: 800; padding: 5px 0; }
.done-stats b { display: flex; align-items: center; justify-content: center; gap: 6px; font-family: var(--display); font-size: 32px; font-weight: 800; padding: 12px 8px 14px; color: var(--c); }
.done-stats b .ico { width: 28px; height: 28px; }
.done-stats .xp { --c: var(--yellow-d); } .done-stats .xp small { color: var(--ink); background: var(--yellow); }
.done-stats .st { --c: var(--orange); }
.confetti { position: fixed; top: -20px; width: 10px; height: 14px; z-index: 200; pointer-events: none; animation: fall linear forwards; }
@keyframes fall { to { transform: translate3d(var(--x), 110vh, 0) rotate(var(--r)); opacity: .9; } }

/* ---------- playground ---------- */
.pg { display: flex; flex-direction: column; height: 100vh; }
.pg-tools { display: flex; align-items: center; gap: 10px; padding: 14px 32px; flex-wrap: wrap; border-bottom: 2px solid var(--border); margin-bottom: 18px; }
.pg-tools h1 { font-size: 22px; margin-right: auto; display: flex; align-items: center; gap: 12px; }
.pg-tools h1 small { font-family: var(--font); font-size: 12px; font-weight: 800; color: var(--blue); padding: 3px 11px; background: var(--blue-l); border-radius: 99px; letter-spacing: .04em; }
.select { appearance: none; background: var(--surface) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5l5 5 5-5' stroke='%238591ae' fill='none' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E") no-repeat right 13px center; color: var(--text); border: 2px solid var(--border); border-bottom: 4px solid var(--border-2); border-radius: 13px; padding: 8px 36px 8px 14px; font: inherit; font-size: 14px; font-weight: 700; cursor: pointer; }
.pg-grid { flex: 1; min-height: 0; display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 18px; padding: 0 32px 28px; }
.pg-grid .ide { height: 100%; }
.pg-out { border-radius: 22px; overflow: hidden; display: flex; min-height: 0; background: var(--code-bar); border-bottom: 6px solid #060e28; }
.pg-out .ide-console { border: 0; min-height: 0; flex: 1; }
.statusline { display: flex; align-items: center; gap: 14px; padding: 7px 16px; font-size: 12px; color: var(--text-3); background: var(--code-bar); border-top: 2px solid var(--code-line); font-family: var(--mono); }
.statusline .pill { display: inline-flex; gap: 6px; align-items: center; padding: 2px 10px; border-radius: 99px; font-family: var(--font); font-weight: 800; font-size: 11.5px; cursor: pointer; }
.pill.ok { background: rgba(61, 220, 151, .16); color: #3ddc97; } .pill.err { background: rgba(255, 107, 116, .16); color: #ff7a82; } .pill.warn { background: rgba(255, 201, 49, .16); color: var(--yellow); }

/* ---------- widgets & modal ---------- */
.bigo { background: var(--surface-2); border: 2px solid var(--border); border-radius: 18px; padding: 14px; margin: 6px 0 14px; }
.bigo svg { width: 100%; height: auto; display: block; stroke-width: 3; }
.bigo .axis { stroke: var(--border-2); stroke-width: 1; } .bigo text { fill: var(--text-3); stroke: none; font-size: 11px; font-family: var(--mono); }
.bigo-ctl { display: flex; align-items: center; gap: 14px; margin: 10px 2px 6px; font-size: 15px; color: var(--text-2); font-weight: 700; }
.bigo-ctl input { flex: 1; accent-color: var(--blue); }
.bigo-ctl output { font-family: var(--mono); color: var(--text); min-width: 3ch; text-align: right; font-weight: 700; }
.bigo-leg { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 8px 14px; margin-top: 8px; }
.bigo-leg div { display: flex; align-items: center; gap: 8px; font-size: 13px; font-family: var(--mono); color: var(--text-2); font-weight: 600; }
.bigo-leg i { width: 12px; height: 12px; border-radius: 4px; flex: none; }
.bigo-leg b { color: var(--text); margin-left: auto; }

.modal-back { position: fixed; inset: 0; z-index: 100; background: rgba(11, 27, 58, .55); display: grid; place-items: center; padding: 20px; animation: fade .2s; }
.modal { width: min(440px, 100%); background: var(--surface); border: 2px solid var(--border); border-bottom-width: 6px; border-radius: 24px; padding: 26px; animation: pop .22s ease-out; }
.modal h2 { font-size: 26px; font-weight: 800; margin-bottom: 4px; }
.modal > p { color: var(--text-2); margin-bottom: 18px; }
.row { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 0; border-top: 2px solid var(--border); }
.row b { display: block; font-size: 16px; font-weight: 800; } .row span { font-size: 14px; color: var(--text-2); }
.switch { position: relative; width: 52px; height: 30px; border-radius: 99px; background: var(--surface-3); transition: .15s; flex: none; border-bottom: 3px solid var(--border-2); }
.switch::after { content: ""; position: absolute; left: 3px; top: 3px; width: 22px; height: 22px; border-radius: 50%; background: #fff; transition: .15s; }
.switch[aria-checked="true"] { background: var(--blue); border-color: var(--blue-d); } .switch[aria-checked="true"]::after { transform: translateX(22px); }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 20px; }
.toast { position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%); background: var(--ink); color: #fff; padding: 11px 20px; border-radius: 14px; font-weight: 700; font-size: 14.5px; z-index: 300; animation: slidein .25s; }
:root[data-theme="dark"] .toast { background: var(--yellow); color: var(--ink); }

/* ---------- CodeMirror ---------- */
.CodeMirror { font-family: var(--mono); font-size: 14.5px; line-height: 1.7; background: var(--code-bg); color: var(--s-var); height: auto; }
.CodeMirror-gutters { background: var(--code-bg); border-right: 0; }
.CodeMirror-linenumber { color: #4b5b8c; padding: 0 12px 0 8px; }
.CodeMirror-cursor { border-left: 2.5px solid var(--yellow); }
.CodeMirror-selected, .CodeMirror-focused .CodeMirror-selected { background: rgba(79, 134, 255, .35) !important; }
.CodeMirror-activeline-background { background: rgba(255, 255, 255, .045); }
.CodeMirror-matchingbracket { color: var(--yellow) !important; background: rgba(255, 201, 49, .18); border-radius: 3px; }
.CodeMirror-nonmatchingbracket { color: #ff7a82 !important; }
.CodeMirror-scroll { padding-bottom: 6px; }
.cm-keyword { color: var(--s-kw); font-weight: 500; }
.cm-def { color: var(--s-def); } .cm-variable { color: var(--s-var); } .cm-variable-2 { color: var(--s-var2); } .cm-variable-3, .cm-type { color: var(--s-def); }
.cm-builtin { color: var(--s-bi); } .cm-string, .cm-string-2 { color: var(--s-str); } .cm-number { color: var(--s-num); }
.cm-comment { color: var(--s-com); font-style: italic; } .cm-operator { color: var(--s-op); } .cm-meta { color: var(--s-bi); } .cm-property { color: var(--s-var); } .cm-atom { color: var(--s-num); }
.cm-s-pl .cm-error { color: #ff7a82; }
.CodeMirror-lint-markers { width: 16px; }
.CodeMirror-lint-marker { width: 9px; height: 9px; border-radius: 50%; display: inline-block; margin: 8px 0 0 3px; cursor: pointer; }
.CodeMirror-lint-marker-error { background: #ff6b74; } .CodeMirror-lint-marker-warning { background: var(--yellow); } .CodeMirror-lint-marker-info { background: #8dbbff; }
.CodeMirror-lint-mark { background-repeat: repeat-x; background-position: left bottom; padding-bottom: 2px; }
.CodeMirror-lint-mark-error { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='6' height='3'%3E%3Cpath d='M0 3l1.5-3 1.5 3 1.5-3 1.5 3' stroke='%23ff6b74' fill='none' stroke-width='1.2'/%3E%3C/svg%3E"); }
.CodeMirror-lint-mark-warning { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='6' height='3'%3E%3Cpath d='M0 3l1.5-3 1.5 3 1.5-3 1.5 3' stroke='%23ffc931' fill='none' stroke-width='1.2'/%3E%3C/svg%3E"); }
.CodeMirror-lint-mark-info { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='6' height='3'%3E%3Cpath d='M0 3l1.5-3 1.5 3 1.5-3 1.5 3' stroke='%238dbbff' fill='none' stroke-width='1.2'/%3E%3C/svg%3E"); }
.CodeMirror-lint-tooltip { background: var(--ink); color: #fff; border-radius: 10px; padding: 7px 12px; font: 600 13px var(--font); position: fixed; z-index: 400; max-width: 360px; }
.CodeMirror-lint-message { padding-left: 0; background: none !important; }
.CodeMirror-lint-multiple { display: none; }

/* ---------- accounts ---------- */
.acct { display: flex; flex-direction: column; gap: 8px; }
.acct[hidden] { display: none; }
.acct-me { display: flex; align-items: center; gap: 10px; padding: 8px; border-radius: 14px; border: 2px solid transparent; transition: background .12s; }
.acct-me:hover { background: var(--surface-2); border-color: var(--border); }
.acct-me span:last-child { display: flex; flex-direction: column; min-width: 0; line-height: 1.25; }
.acct-me b { font-size: 14px; font-weight: 800; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.acct-me small { color: var(--text-3); font-size: 12px; font-weight: 600; overflow: hidden; text-overflow: ellipsis; }
.avatar { display: inline-grid; place-items: center; flex: none; border-radius: 50%; overflow: hidden; border: 2px solid var(--ink); background: var(--surface-3); }
:root[data-theme="dark"] .avatar { border-color: var(--border-2); }
.avatar svg, .avatar img { width: 100%; height: 100%; display: block; object-fit: cover; stroke: none; fill: initial; }
.banner { border-radius: 14px; padding: 10px 14px; font-weight: 700; font-size: 14px; margin-bottom: 14px; }
.banner.demo { background: var(--yellow-l); color: var(--ink); border: 2px dashed var(--yellow-d); }
:root[data-theme="dark"] .banner.demo { color: var(--yellow); }

.auth-wrap { min-height: calc(100vh - 20px); display: grid; place-items: center; padding: 28px 16px; }
.auth-card { width: min(440px, 100%); background: var(--surface); border: 2px solid var(--border); border-bottom-width: 6px; border-radius: 26px; padding: 28px 30px 26px; }
.auth-mascot { display: flex; justify-content: center; margin: -6px 0 6px; }
.auth-card h1 { font-size: 30px; font-weight: 800; letter-spacing: -.03em; text-align: center; }
.auth-card .sub { text-align: center; color: var(--text-2); margin: 6px 0 20px; font-size: 15px; }
.gbtn { gap: 12px; }
.or { display: flex; align-items: center; gap: 12px; color: var(--text-3); font-weight: 800; font-size: 12px; letter-spacing: .1em; text-transform: uppercase; margin: 16px 0; }
.or::before, .or::after { content: ""; flex: 1; height: 2px; background: var(--border); }
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.field label { font-size: 13px; font-weight: 800; color: var(--text-2); letter-spacing: .02em; }
.input { width: 100%; font: inherit; font-weight: 600; font-size: 16px; color: var(--text); background: var(--surface-2); border: 2px solid var(--border); border-bottom-width: 4px; border-radius: 13px; padding: 11px 14px; transition: border-color .12s, background .12s; }
.input:focus { outline: none; border-color: var(--blue); background: var(--surface); }
.input.code { letter-spacing: .5em; text-align: center; font-family: var(--mono); font-size: 22px; }
.input.time { width: auto; }
.pwbox { position: relative; }
.pwbox .input { padding-right: 46px; }
.pwtoggle { position: absolute; right: 6px; top: 50%; transform: translateY(-58%); width: 34px; height: 34px; border-radius: 10px; color: var(--text-3); display: grid; place-items: center; }
.pwtoggle:hover, .pwtoggle.on { color: var(--blue); }
.pwtoggle svg { width: 20px; height: 20px; }
.hint { font-size: 13px; font-weight: 600; color: var(--text-3); min-height: 18px; }
.hint.warn { color: var(--bad); } .hint.good { color: var(--good); }
.meter { display: flex; align-items: center; gap: 5px; margin-top: 2px; }
.meter i { flex: 0 0 34px; height: 7px; border-radius: 9px; background: var(--surface-3); }
.meter.weak i.on { background: var(--bad); } .meter.ok i.on { background: var(--yellow); } .meter.strong i.on { background: var(--good); }
.meter span { font-size: 12.5px; font-weight: 800; color: var(--text-2); margin-left: 6px; }
.err { min-height: 0; font-size: 14px; font-weight: 700; color: var(--bad); margin: -4px 0 12px; display: none; }
.err.show { display: block; } .err.good { color: var(--good); }
.links { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 18px; font-size: 14px; font-weight: 700; color: var(--text-2); }
.links a { color: var(--blue); } .links a:hover { text-decoration: underline; }
.btn.loading { position: relative; color: transparent; pointer-events: none; }
.btn.loading::after { content: ""; position: absolute; width: 18px; height: 18px; border-radius: 50%; border: 3px solid rgba(255, 255, 255, .4); border-top-color: #fff; animation: spin .7s linear infinite; }

.settings { max-width: 760px; margin: 0 auto; padding: 24px 32px 70px; display: flex; flex-direction: column; gap: 18px; }
.set-card { background: var(--surface); border: 2px solid var(--border); border-bottom-width: 4px; border-radius: var(--r); padding: 18px 22px 8px; }
.set-card h3 { font-family: var(--font); font-size: 12px; text-transform: uppercase; letter-spacing: .12em; color: var(--text-3); font-weight: 800; margin-bottom: 4px; }
.srow { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 14px 0; border-top: 2px solid var(--border); }
.set-card h3 + .srow, .avatar-row + .srow { border-top: 0; }
.srow[hidden], #rem-opts[hidden], #pw-form[hidden] { display: none; }
.stext { min-width: 0; } .stext b { display: block; font-size: 16px; font-weight: 800; } .stext span { display: block; font-size: 13.5px; color: var(--text-2); font-weight: 500; line-height: 1.4; margin-top: 2px; }
.sctl { flex: none; max-width: 52%; display: flex; flex-direction: column; align-items: flex-end; } .sctl .input { min-width: 200px; }
.static { font-weight: 700; color: var(--text-2); font-size: 14.5px; word-break: break-all; text-align: right; }
.danger { color: var(--bad); }
.fine { font-size: 13px; color: var(--text-3); font-weight: 600; padding: 4px 0 14px; }
.btns { display: flex; gap: 8px; flex-wrap: wrap; margin: 10px 0 4px; }
.avatar-row { display: flex; gap: 20px; align-items: flex-start; padding: 12px 0 16px; } .avatar-row > div { min-width: 0; } .avatar-row b { font-size: 16px; font-weight: 800; }
.presets { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.presets button { border-radius: 50%; padding: 2px; border: 3px solid transparent; transition: transform .1s; } .presets button:hover { transform: scale(1.08); } .presets button.on { border-color: var(--blue); }
.seg { display: inline-flex; background: var(--surface-2); border: 2px solid var(--border); border-radius: 13px; padding: 3px; gap: 2px; }
.seg button { padding: 6px 14px; border-radius: 10px; font-weight: 800; font-size: 13.5px; color: var(--text-2); }
.seg button.on { background: var(--blue); color: #fff; }
.banner-card { display: flex; gap: 18px; align-items: center; padding-bottom: 18px; } .banner-card h3 { font-family: var(--display); font-size: 20px; text-transform: none; letter-spacing: -.01em; color: var(--text); margin-bottom: 2px; } .banner-card p { color: var(--text-2); font-size: 14.5px; }
.set-foot { display: flex; justify-content: center; padding-top: 4px; }

.lb-wrap { max-width: 720px; margin: 0 auto; padding: 22px 32px 70px; }
.lb-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.lb-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.lb-row { display: flex; align-items: center; gap: 14px; background: var(--surface); border: 2px solid var(--border); border-bottom-width: 4px; border-radius: 16px; padding: 10px 16px; }
.lb-row.me { border-color: var(--blue); background: var(--blue-l); }
.lb-row .rk { width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center; font-family: var(--display); font-weight: 800; font-size: 16px; color: var(--text-2); flex: none; }
.lb-row .rk.m1 { background: var(--yellow); color: var(--ink); } .lb-row .rk.m2 { background: #cfd6e4; color: var(--ink); } .lb-row .rk.m3 { background: #f0a367; color: var(--ink); }
.lb-row .nm { flex: 1; min-width: 0; font-weight: 800; font-size: 16px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lb-row .nm em { font-style: normal; font-size: 11px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; background: var(--blue); color: #fff; border-radius: 99px; padding: 2px 8px; margin-left: 6px; }
.lb-row .xp { font-family: var(--display); font-weight: 800; font-size: 19px; color: var(--yellow-d); } .lb-row .xp small { font-family: var(--font); font-size: 12px; color: var(--text-3); font-weight: 800; }
:root[data-theme="dark"] .lb-row .xp { color: var(--yellow); }
.lb-gap { text-align: center; color: var(--text-3); font-weight: 800; line-height: 1; }
.lb-skel i { display: block; height: 62px; border-radius: 16px; background: var(--surface-3); margin-bottom: 10px; animation: blinkdot 1.2s infinite; }
.empty-card { text-align: center; background: var(--surface); border: 2px solid var(--border); border-bottom-width: 4px; border-radius: 22px; padding: 34px 24px; display: flex; flex-direction: column; align-items: center; gap: 10px; }
.empty-card h2 { font-size: 24px; } .empty-card p { color: var(--text-2); max-width: 420px; }
.empty-card .btns { justify-content: center; }

/* ---------- code visualizer ---------- */
body.viz-open { overflow: hidden; }
.viz-root { position: fixed; inset: 0; z-index: 70; background: var(--bg); display: flex; flex-direction: column; animation: fade .2s; }
.viz-top { display: flex; align-items: center; gap: 14px; padding: 10px 22px; border-bottom: 2px solid var(--border); }
.viz-top h2 { font-size: 20px; margin-right: auto; }
.viz-count { font-weight: 800; color: var(--text-2); font-variant-numeric: tabular-nums; }
.viz-keys { font-size: 12.5px; color: var(--text-3); font-weight: 700; }
.viz-main { flex: 1; min-height: 0; display: grid; grid-template-columns: minmax(300px, 42%) minmax(0, 1fr); gap: 18px; padding: 16px 22px; }
.viz-left, .viz-right { display: flex; flex-direction: column; gap: 14px; min-height: 0; }
.viz-code { flex: 1 1 62%; min-height: 200px; border-radius: 18px; overflow: hidden; background: var(--code-bg); position: relative; border-bottom: 5px solid #060e28; }
.viz-code .CodeMirror { position: absolute; inset: 0; height: auto; }
.CodeMirror .viz-cur { background: rgba(255, 201, 49, .2) !important; box-shadow: inset 4px 0 0 var(--yellow); }
.CodeMirror .viz-prev { background: rgba(79, 134, 255, .16); }
.CodeMirror .viz-err { background: rgba(255, 107, 116, .26) !important; box-shadow: inset 4px 0 0 #ff6b74; }
.viz-outbox { flex: 1 1 28%; min-height: 96px; border-radius: 18px; background: var(--code-bar); color: #eaf0ff; padding: 10px 16px; overflow: auto; border-bottom: 5px solid #060e28; }
.viz-outbox h3, .viz-col h3 { font: 800 11.5px var(--font); letter-spacing: .1em; text-transform: uppercase; color: var(--text-3); margin: 0 0 8px; }
.viz-outbox pre { margin: 0; font-size: 13.5px; line-height: 1.6; white-space: pre-wrap; }
.viz-note { display: flex; gap: 12px; align-items: center; background: var(--surface); border: 2px solid var(--border); border-bottom-width: 4px; border-radius: 18px; padding: 8px 16px; min-height: 76px; }
.viz-note p { font-weight: 700; font-size: 15.5px; line-height: 1.45; }
.viz-trunc { background: var(--yellow-l); color: var(--text); border: 2px dashed var(--yellow-d); border-radius: 12px; padding: 6px 12px; font-size: 13px; font-weight: 700; }
.viz-state { position: relative; flex: 1; min-height: 0; overflow: auto; display: grid; grid-template-columns: minmax(190px, 42%) minmax(0, 1fr); gap: 34px; align-content: start; padding: 14px 16px; background: var(--surface-2); border: 2px solid var(--border); border-radius: 18px; }
.frame { background: var(--surface); border: 2px solid var(--border); border-radius: 14px; padding: 8px 12px 6px; margin-bottom: 10px; }
.frame.active { border-color: var(--blue); }
.frame .fh { font-weight: 800; font-size: 13.5px; color: var(--blue); margin-bottom: 4px; }
.frame table, .kv { border-collapse: collapse; font-family: var(--mono); font-size: 13px; }
.frame table { width: 100%; }
.frame th, .kv th { text-align: left; color: var(--text-2); font-weight: 600; padding: 3px 10px 3px 0; }
.frame td { padding: 3px 0; text-align: right; }
.kv td { padding: 2px 8px 2px 0; }
.frame .ret { margin-top: 6px; padding-top: 6px; border-top: 2px dashed var(--border); font-family: var(--mono); font-size: 13px; font-weight: 700; color: var(--good); }
.pv { display: inline-block; background: var(--yellow-l); color: var(--text); border-radius: 7px; padding: 1px 8px; font-weight: 700; }
.ptr { display: inline-block; width: 12px; height: 12px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 3px var(--blue-l); vertical-align: middle; }
.obj { background: var(--surface); border: 2px solid var(--border-2); border-radius: 12px; margin-bottom: 12px; padding: 6px 10px 10px; width: max-content; max-width: 100%; }
.obj .oh { font-size: 11px; font-weight: 800; color: var(--text-3); text-transform: uppercase; letter-spacing: .08em; margin-bottom: 4px; }
.cells { display: flex; flex-wrap: wrap; gap: 4px; align-items: stretch; }
.cell { position: relative; min-width: 38px; text-align: center; border: 2px solid var(--border-2); border-radius: 8px; padding: 14px 8px 5px; font-family: var(--mono); font-size: 13px; }
.cell small { position: absolute; top: 1px; left: 0; right: 0; font: 800 9.5px var(--font); color: var(--text-3); }
.more { align-self: center; font-size: 12px; font-weight: 700; color: var(--text-3); padding: 0 6px; }
.viz-state .none { color: var(--text-3); font-size: 13px; font-weight: 600; }
.flash { animation: vflash 1.2s ease-out; }
@keyframes vflash { 0% { background: var(--yellow); box-shadow: 0 0 0 4px var(--yellow); } 100% { box-shadow: 0 0 0 4px transparent; } }
.viz-arrows { position: absolute; left: 0; top: 0; pointer-events: none; color: var(--blue); overflow: visible; }
.viz-arrows path { fill: none; stroke: currentColor; stroke-width: 2; opacity: .85; }
.viz-ctl { display: flex; align-items: center; gap: 18px; padding: 12px 22px calc(12px + env(safe-area-inset-bottom)); border-top: 2px solid var(--border); }
.viz-btns { display: flex; gap: 8px; align-items: center; }
.viz-play { width: 58px; height: 46px; padding: 0; }
.viz-play .ico { width: 20px; height: 20px; }
#viz-slider { flex: 1; accent-color: var(--blue); min-width: 80px; }
.viz-speed { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 13px; color: var(--text-2); }
.viz-msg { margin: auto; text-align: center; max-width: 460px; display: flex; flex-direction: column; align-items: center; gap: 10px; }
.viz-msg .h { color: var(--text-2); font-size: 14px; } .viz-msg p { color: var(--text-2); }
.viz-loading { margin: auto; display: flex; gap: 10px; align-items: center; color: var(--text-2); font-weight: 700; }
.runbtn { position: absolute; top: 8px; right: 8px; display: inline-flex; align-items: center; gap: 6px; background: rgba(255, 201, 49, .16); color: var(--yellow); border: 2px solid rgba(255, 201, 49, .5); border-radius: 10px; padding: 4px 10px; font: 800 12.5px var(--font); }
.runbtn:hover { background: var(--yellow); color: var(--ink); }
.runbtn .ico { width: 13px; height: 13px; }
.prose pre { position: relative; }

/* ---------- review ---------- */
.due-badge { font-style: normal; margin-left: auto; min-width: 22px; height: 22px; padding: 0 7px; border-radius: 99px; background: var(--yellow); color: var(--ink); font: 800 12px/22px var(--font); text-align: center; letter-spacing: 0; }
.nav a .due-badge[hidden], .bottomnav .due-badge[hidden] { display: none; }
.revcard .revrow { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.revcard b { display: block; font-family: var(--display); font-size: 17px; } .revcard span { font-size: 13px; color: var(--text-2); }
.review { max-width: 820px; margin: 0 auto; padding: 24px 32px 70px; display: flex; flex-direction: column; gap: 18px; }
.rev-hero { display: flex; gap: 22px; align-items: center; padding: 24px; }
.rev-hero h2 { font-size: 30px; font-weight: 800; letter-spacing: -.03em; } .rev-hero p { color: var(--text-2); margin: 4px 0 6px; max-width: 460px; }
.rev-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 18px; }
.rev-grid .lvl-bar i { background: var(--good); }
.bars { display: flex; align-items: flex-end; justify-content: space-between; gap: 8px; height: 130px; padding-top: 6px; }
.bars div { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: flex-end; height: 100%; gap: 3px; }
.bars i { display: block; width: 100%; max-width: 34px; border-radius: 8px 8px 4px 4px; background: var(--surface-3); min-height: 6px; }
.bars i.now { background: var(--yellow); }
.bars small { font-size: 11px; font-weight: 800; color: var(--text-3); white-space: nowrap; } .bars b { font-size: 12px; color: var(--text-2); }

/* ---------- responsive ---------- */
@media (max-width: 1099px) { .learn { grid-template-columns: minmax(0, 1fr); } .rail { display: none; } .learn .greet { display: block; } }
@media (max-width: 900px) {
  .viz-main { grid-template-columns: 1fr; overflow: auto; padding: 12px 14px; display: flex; flex-direction: column; }
  .viz-left, .viz-right { display: contents; } .viz-code { order: 1; flex: none; height: 240px; } .viz-note { order: 2; flex: none; } .viz-trunc { order: 3; } .viz-state { order: 4; flex: none; } .viz-outbox { order: 5; flex: none; } .viz-state { overflow: visible; min-height: 220px; }
  .viz-keys { display: none; } .viz-top { padding: 10px 14px; } .viz-ctl { flex-wrap: wrap; padding: 10px 14px calc(10px + env(safe-area-inset-bottom)); gap: 10px; } #viz-slider { order: 3; flex-basis: 100%; }
  .shell { grid-template-columns: 1fr; padding-bottom: 72px; }
  .sidebar { display: none; }
  .bottomnav { position: fixed; bottom: 0; left: 0; right: 0; z-index: 30; display: flex; justify-content: space-around; padding: 8px 8px calc(8px + env(safe-area-inset-bottom)); background: var(--bg); border-top: 2px solid var(--border); }
  .bottomnav a, .bottomnav button { display: flex; flex-direction: column; align-items: center; gap: 2px; font-size: 11px; font-weight: 800; letter-spacing: 0; color: var(--text-3); padding: 6px 2px; flex: 1 1 0; min-width: 0; border-radius: 12px; border: 2px solid transparent; }
  .bottomnav a span { max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 11px; }
  .bottomnav svg { width: 24px; height: 24px; }
  .bottomnav a { position: relative; } .bottomnav .due-badge { position: absolute; top: 0; right: 14%; margin: 0; min-width: 18px; height: 18px; font-size: 11px; line-height: 18px; padding: 0 5px; }
  .bottomnav a.active { color: var(--blue); background: var(--blue-l); border-color: var(--blue); }
  .topbar { padding: 10px 14px; justify-content: space-between; } .topbar h1 { display: none; }
  .learn { padding: 16px 16px 40px; }
  .pg { height: auto; min-height: calc(100vh - 72px); }
  .pg-tools { padding: 12px 16px; margin-bottom: 14px; } .pg-grid { grid-template-columns: 1fr; padding: 0 16px 16px; }
  .pg-grid .ide { height: 460px; } .pg-out { height: 340px; }
  .code-step { grid-template-columns: 1fr; height: auto; } .l-wrap.wide { height: auto; }
  .ide { min-height: 420px; }
  .learn-card { padding: 22px 20px; } .learn-card h2 { font-size: 26px; } .quiz h2 { font-size: 24px; } .done-screen h2 { font-size: 34px; }
  .l-top { padding: 12px 14px; } .l-body { padding: 6px 14px 20px; } .l-foot { padding-left: 14px; padding-right: 14px; }
  .fb p { font-size: 13.5px; line-height: 1.35; } .fb-mascot { width: 48px; } .fb h4 { font-size: 18px; }
  .bubble { font-size: 14.5px; padding: 8px 12px; }
  .l-foot-in > .kbd-hint { display: none; }
}
@media (max-width: 700px) { .review { padding: 16px 14px 60px; } .rev-hero { flex-direction: column; text-align: center; } .rev-hero .btns { justify-content: center; } .rev-grid { grid-template-columns: 1fr; } .settings, .lb-wrap { padding: 16px 14px 60px; } .srow { flex-direction: column; align-items: stretch; gap: 10px; } .sctl { max-width: none; align-items: flex-start; } .static { text-align: left; } .avatar-row { flex-direction: column; } .auth-card { padding: 22px 18px; } .lb-row { padding: 8px 12px; gap: 10px; } }
@media (max-width: 520px) { .btn { padding: 11px 16px; } .stat { padding: 6px 8px; font-size: 15px; } .l-foot-in { gap: 8px; } .btn .kbd { display: none; } }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }

/* difficulty pips */
.pips { display: inline-flex; gap: 2px; vertical-align: middle; margin-right: 6px; }
.pips i { width: 5px; height: 11px; border-radius: 2px; background: var(--border-2); }
.pips i.on { background: var(--c1, var(--text-3)); }
.chip.lvl { display: inline-flex; align-items: center; }
.chip.proj { background: var(--yellow); color: var(--ink); border-color: transparent; }
.u-teal { --c1: #14b8a6; --c-d: #0d8c7e; --on: #fff; }
.u-red { --c1: #ef4444; --c-d: #c22d2d; --on: #fff; }

/* learning path: fields as sections of lesson cards */
.path { align-items: stretch; width: 100%; max-width: 760px; margin: 0 auto; }
.path .goal-banner { max-width: none; }
.upnext { display: flex; align-items: center; gap: 14px; padding: 14px 16px; margin: 4px 0 12px; border-radius: var(--r); background: var(--surface); border: 2px solid var(--c1); border-bottom-width: 5px; }
.upnext > div { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.upnext small { font-size: 11px; font-weight: 800; letter-spacing: .14em; color: var(--c1); }
.upnext b { font-size: 19px; letter-spacing: -.02em; }
.path-tools { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: 13px; color: var(--text-2); font-weight: 600; }
.path-tools b { color: var(--text); }
.path-tools .select { font-size: 13px; padding: 6px 10px; }
.field { margin-top: 30px; }
.field-head { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.fdot { width: 14px; height: 14px; border-radius: 50%; background: var(--c1); box-shadow: 0 3px 0 var(--c-d); flex: none; }
.field-head h2 { flex: 1; font-size: 21px; letter-spacing: -.02em; }
.fcount { font-size: 13px; font-weight: 800; color: var(--text-3); }
.stages { list-style: none; margin: 0; padding: 0; }
.stage { position: relative; display: grid; grid-template-columns: 30px 1fr; gap: 14px; padding-bottom: 14px; }
.stage:not(:last-child)::after { content: ""; position: absolute; left: 13px; top: 32px; bottom: 2px; width: 4px; border-radius: 2px; background: var(--border-2); }
.stage.done:not(:last-child)::after { background: var(--c1); }
.snum { width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; font-size: 13px; font-weight: 800; background: var(--surface); border: 2.5px solid var(--c1); color: var(--c1); z-index: 1; }
.stage.done .snum { background: var(--c1); color: var(--on); }
.snum svg { width: 15px; height: 15px; stroke-width: 3.2; }
.anyorder { display: block; font-size: 11px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--text-3); margin: 6px 0 6px; }
.stage > div > .lgrid { margin-top: 0; }
.lgrid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.lcard { position: relative; display: grid; grid-template-columns: 44px 1fr; grid-template-rows: auto auto; column-gap: 12px; align-items: center; text-align: left; padding: 12px 12px 10px; border-radius: 16px; background: var(--surface); border: 2px solid var(--border); border-bottom-width: 4px; color: var(--text); cursor: pointer; transition: transform .1s, border-color .1s; }
.lcard:hover { transform: translateY(-2px); border-color: var(--c1); }
.lcard:active { transform: translateY(2px); }
.lc-ico { grid-row: 1 / span 2; width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center; background: var(--c1); color: var(--on); box-shadow: 0 3px 0 var(--c-d); }
.lc-ico svg { width: 22px; height: 22px; stroke-width: 2.3; }
.lc-body { display: flex; flex-direction: column; min-width: 0; }
.lc-body b { font-size: 15px; line-height: 1.25; letter-spacing: -.01em; }
.lc-body small { font-size: 12px; color: var(--text-2); font-weight: 600; line-height: 1.3; }
.lc-lvl { grid-column: 2; margin-top: 6px; display: flex; align-items: center; }
.lcard.proj .lc-ico { border-radius: 13px; }
.lcard.proj { border-style: dashed; border-bottom-style: solid; }
.lc-proj { position: absolute; top: 8px; right: 10px; font-size: 9.5px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; background: var(--yellow); color: var(--ink); padding: 1px 7px; border-radius: 99px; }
.lcard.proj .lc-body { padding-right: 48px; }
.lcard.done .lc-ico { background: var(--green, #2fb86b); box-shadow: 0 3px 0 #1f8f4f; color: #fff; }
.lcard.locked { background: var(--surface-2); }
.lcard.locked .lc-ico { background: var(--surface-3); color: var(--text-3); box-shadow: 0 3px 0 var(--border-2); }
.lcard.locked .lc-body b { color: var(--text-2); }
.lcard.locked .lc-body small { color: var(--text-3); }
.lcard.open, .lcard.current { border-color: var(--c1); }
.lcard.sel { border-color: var(--text); }
.lcard.dim { opacity: .3; }
.lc-next { position: absolute; top: -9px; right: 10px; background: var(--yellow); color: var(--ink); font-weight: 800; font-size: 11px; letter-spacing: .08em; padding: 2px 9px; border-radius: 99px; }
.field .node-pop { width: 100%; max-width: none; margin: 10px 0 0; text-align: left; padding: 16px 18px; border-color: var(--c1); position: relative; }
.field .node-pop::before { display: none; }
.node-pop h3 { font-size: 20px; padding-right: 30px; }
.node-pop p { margin: 4px 0 10px; }
.pop-kicker { display: flex; align-items: center; font-size: 11.5px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--c1); }
.pop-x { position: absolute; top: 10px; right: 10px; width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; color: var(--text-3); }
.pop-x:hover { background: var(--surface-2); color: var(--text); }
.pop-x svg { width: 16px; height: 16px; }
.pop-learn { background: var(--surface-2); border-radius: 12px; padding: 10px 14px; margin-bottom: 12px; font-size: 14px; }
.pop-learn ul { margin: 4px 0 0; padding-left: 18px; color: var(--text-2); }
.pop-foot { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.pop-foot > span { font-size: 12.5px; font-weight: 700; color: var(--text-3); }
.pop-foot .btn { margin-left: auto; display: inline-flex; align-items: center; gap: 6px; }
.pop-foot .btn svg { width: 16px; height: 16px; }
.pop-lock { display: flex; gap: 10px; align-items: center; color: var(--text-2); margin: 0 !important; }
.pop-lock svg { width: 18px; height: 18px; flex: none; }
.pop-lock b { color: var(--text); }
@media (max-width: 560px) { .pop-foot .btn { width: 100%; justify-content: center; } }
@media (max-width: 560px) { .lgrid { grid-template-columns: 1fr; } .upnext { flex-wrap: wrap; } .upnext .btn { width: 100%; } }

/* lesson steps: try-it editor, fill in the blanks, put the lines in order */
.tryit { margin: 0 0 14px; border-radius: 16px; overflow: hidden; background: var(--code-bg); border: 2px solid var(--yellow-d); --text: #eaf0ff; --text-2: #a9b7dd; --text-3: #8d9cc8; }
.tryit-bar { display: flex; align-items: center; gap: 8px; padding: 7px 10px 7px 14px; background: var(--code-bar); color: var(--text-2); font-size: 12.5px; font-weight: 700; }
.tryit-bar > span:first-child { display: inline-flex; align-items: center; gap: 6px; color: var(--yellow); }
.tryit-bar svg { width: 15px; height: 15px; }
.tryit-bar .sp { flex: 1; }
.tryit-ed .CodeMirror { height: auto; min-height: 56px; }
.tryit-ed .CodeMirror-scroll { min-height: 56px; }
.tryit-out { padding: 10px 14px; border-top: 2px solid var(--code-line); background: var(--code-bar); color: #eaf0ff; font-family: var(--mono); font-size: 13.5px; min-height: 40px; }
.tryit-out pre { margin: 0; padding: 0; background: none; font-size: inherit; color: inherit; white-space: pre-wrap; }
.tryit-out.run { color: var(--text-3); font-family: var(--font); }
.tryit-out .dim { color: var(--text-3); font-family: var(--font); }
.tryit-out .errbox { font-size: 13px; }
.hintbox + .hintbox { margin-top: 8px; }

.fillcode { margin: 0; padding: 18px 18px 20px; background: var(--code-bg); font-family: var(--mono); font-size: 14.5px; line-height: 2.1; color: #eaf0ff; overflow: auto; flex: 1 1 55%; min-height: 160px; white-space: pre; tab-size: 4; }
.blank { font: inherit; line-height: 1.4; color: #fff; background: #192b5e; border: 0; border-bottom: 2.5px solid var(--yellow); border-radius: 6px 6px 2px 2px; padding: 1px 6px; margin: 0 2px; text-align: center; min-width: 3ch; }
.blank:focus { outline: none; background: #233773; box-shadow: 0 0 0 3px rgba(255, 201, 49, .35); }
.blank.ok { border-bottom-color: var(--good); color: var(--good); }

.parsons { flex: 1 1 55%; min-height: 200px; overflow: auto; padding: 14px 16px 16px; display: flex; flex-direction: column; gap: 10px; --text: #eaf0ff; }
.p-built { min-height: 56px; border: 2px dashed #32487f; border-radius: 14px; padding: 8px; display: flex; flex-direction: column; gap: 6px; }
.p-empty { color: #8d9cc8; font-size: 14px; padding: 10px 8px; }
.p-label { font-size: 11.5px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; color: #8d9cc8; }
.p-pool { display: flex; flex-direction: column; gap: 6px; align-items: flex-start; }
.pline { display: flex; align-items: stretch; border-radius: 10px; background: #192b5e; border: 2px solid #32487f; border-bottom-width: 4px; color: #eaf0ff; text-align: left; }
.pline code { font-family: var(--mono); font-size: 14px; line-height: 1.5; white-space: pre; padding: 6px 12px; display: block; }
.pline.pool { cursor: pointer; transition: transform .1s, border-color .1s; }
.pline.pool:hover { border-color: var(--yellow); transform: translateY(-1px); }
.pline.built { width: 100%; background: #233773; }
.pl-text { flex: 1; text-align: left; color: inherit; cursor: pointer; border-radius: 8px; min-width: 0; overflow-x: auto; }
.pl-text:hover { background: rgba(255, 255, 255, .06); }
.pl-move { display: flex; flex-direction: column; justify-content: center; padding: 0 4px; }
.pl-move button { font-size: 10px; line-height: 1; padding: 3px 7px; color: #a9b7dd; border-radius: 6px; cursor: pointer; }
.pl-move button:hover:not(:disabled) { background: rgba(255, 255, 255, .12); color: #fff; }
.pl-move button:disabled { opacity: .25; cursor: default; }
.ide:has(.parsons) .ide-console, .ide:has(.fillcode) .ide-console { flex: 0 0 150px; min-height: 120px; }
.parsons { flex: 1 1 0; min-height: 0; }
.p-given { margin: 0; padding: 10px 14px; border-radius: 12px; background: #0b1638; border: 2px solid #22336e; font-size: 13.5px; line-height: 1.6; opacity: .9; }
.parsons > * { flex: none; }