/* Dark theme (default) */
:root {
  --bg: #0f172a;
  --panel: #1e293b;
  --panel-2: #273449;
  --border: #334155;
  --border-2: #475569;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #22d3ee;
  --on-accent: #020617;
  --ok: #4ade80;
  --ok-bg: #14532d;
  --bad: #f87171;
  --bad-bg: #450a0a;
  --bad-text: #fecaca;
  --star: #facc15;
  --star-off: #334155;
  --code-bg: #020617;
  --todo: #64748b;
  --learn-bg: #164e63;
  --learn-code: #0e3a4a;
  --race-bg: linear-gradient(120deg, #7c2d12, #9a3412 50%, #1e293b);
  --race-text: #fed7aa;
  --continue-bg: linear-gradient(120deg, #14532d, #166534 50%, #1e293b);
  --continue-text: #bbf7d0;
  --use-mix: #fff;
  --mono: 'Consolas', 'Fira Code', 'Courier New', monospace;
  color-scheme: dark;
}

/* Light theme: follows the device setting, or the ☀️/🌙 button (data-theme on <html>) */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f1f5f9;
    --panel: #ffffff;
    --panel-2: #e2e8f0;
    --border: #cbd5e1;
    --border-2: #94a3b8;
    --text: #0f172a;
    --muted: #475569;
    --accent: #0891b2;
    --on-accent: #ffffff;
    --ok: #16a34a;
    --ok-bg: #dcfce7;
    --bad: #dc2626;
    --bad-bg: #fee2e2;
    --bad-text: #991b1b;
    --star: #f59e0b;
    --star-off: #cbd5e1;
    --code-bg: #f8fafc;
    --todo: #94a3b8;
    --learn-bg: #cffafe;
    --learn-code: #a5f3fc;
    --race-bg: linear-gradient(120deg, #fdba74, #fed7aa 50%, #ffffff);
    --race-text: #9a3412;
    --continue-bg: linear-gradient(120deg, #86efac, #bbf7d0 50%, #ffffff);
    --continue-text: #166534;
    --use-mix: #000;
    color-scheme: light;
  }
}
:root[data-theme="light"] {
  --bg: #f1f5f9;
  --panel: #ffffff;
  --panel-2: #e2e8f0;
  --border: #cbd5e1;
  --border-2: #94a3b8;
  --text: #0f172a;
  --muted: #475569;
  --accent: #0891b2;
  --on-accent: #ffffff;
  --ok: #16a34a;
  --ok-bg: #dcfce7;
  --bad: #dc2626;
  --bad-bg: #fee2e2;
  --bad-text: #991b1b;
  --star: #f59e0b;
  --star-off: #cbd5e1;
  --code-bg: #f8fafc;
  --todo: #94a3b8;
  --learn-bg: #cffafe;
  --learn-code: #a5f3fc;
  --race-bg: linear-gradient(120deg, #fdba74, #fed7aa 50%, #ffffff);
  --race-text: #9a3412;
  --continue-bg: linear-gradient(120deg, #86efac, #bbf7d0 50%, #ffffff);
  --continue-text: #166534;
  --use-mix: #000;
  color-scheme: light;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
}

.topbar {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 12px 24px; background: var(--panel); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 20;
}
.logo { font-size: 1.4rem; font-weight: 800; cursor: pointer; white-space: nowrap; }
.logo span, .accent { color: var(--accent); }
.top-right { display: flex; align-items: center; gap: 8px; }
.user-chip {
  font-weight: 700; background: var(--panel-2); padding: 6px 14px; border-radius: 999px;
  display: flex; align-items: center; gap: 6px; white-space: nowrap;
}
#userAvatar { font-size: 1.2rem; }
.theme-btn {
  background: var(--panel-2); width: 38px; height: 38px; border-radius: 50%;
  display: grid; place-items: center; font-size: 1.1rem;
}
.theme-btn:hover { outline: 2px solid var(--accent); }

/* Main menu — top bar on computers */
.nav { display: flex; gap: 4px; }
.nav button {
  background: none; color: var(--muted); padding: 8px 14px; border-radius: 10px; font-weight: 600;
  display: flex; align-items: center; gap: 6px;
}
.nav button:hover { color: var(--text); background: var(--panel-2); }
.nav button.active { color: var(--accent); background: var(--panel-2); }
body.no-user .nav, body.no-user .user-chip { display: none; }

main { max-width: 900px; margin: 0 auto; padding: 32px 16px; }
.screen { display: none; }
.screen.active { display: block; animation: fade .25s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; } }

h1 { font-size: 2.4rem; text-align: center; margin: 10px 0; }
.sub { text-align: center; color: var(--muted); margin-bottom: 36px; }

button { font: inherit; color: inherit; cursor: pointer; border: none; }

/* Path tabs */
.tabs { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 6px; margin-bottom: 16px; scrollbar-width: none; }
.tabs::-webkit-scrollbar { display: none; }
.tab {
  background: var(--panel); color: var(--muted); padding: 10px 16px; border-radius: 999px;
  white-space: nowrap; font-weight: 600; border: 2px solid transparent;
}
.tab:hover { color: var(--text); }
.tab.active { background: var(--panel-2); color: var(--accent); border-color: var(--accent); }
.track-info { margin-bottom: 22px; color: var(--muted); }
.track-info p { margin: 0 0 10px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font-size: .85rem; }
.chip { background: var(--panel-2); color: var(--text); padding: 4px 10px; border-radius: 999px; border: 1px dashed var(--border-2); }

/* Language cards */
.lang-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 18px; }
.lang-card {
  background: var(--panel); border: 2px solid transparent; border-radius: 16px;
  padding: 28px 16px; display: flex; flex-direction: column; align-items: center; gap: 8px;
  transition: transform .15s, border-color .15s;
}
.lang-card:hover { transform: translateY(-4px); border-color: var(--c); }
.lang-card .icon { font-size: 3rem; }
.lang-card b { font-size: 1.3rem; }
.lang-card small { color: var(--muted); }
/* Language color, nudged toward the text color so it stays readable in both themes */
.lang-card .use { font-size: .85rem; color: color-mix(in srgb, var(--c) 75%, var(--use-mix)); text-align: center; }

/* Level map */
.back { background: none; color: var(--muted); padding: 4px 0; margin-bottom: 8px; }
.back:hover { color: var(--accent); }
.level-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 14px; }
.level {
  background: var(--panel); border-radius: 14px; padding: 16px;
  display: flex; flex-direction: column; align-items: flex-start; gap: 4px; text-align: left;
  border: 2px solid transparent; transition: border-color .15s;
}
.level:hover:not(.locked) { border-color: var(--accent); }
.level .num {
  background: var(--panel-2); width: 34px; height: 34px; border-radius: 50%;
  display: grid; place-items: center; font-weight: 700; margin-bottom: 4px;
}
.level small { color: var(--muted); }
.level.locked { opacity: .45; cursor: not-allowed; }
.mini-stars { color: var(--star); letter-spacing: 2px; }

/* Play */
.play-head { display: flex; justify-content: space-between; align-items: center; }
.badge { background: var(--panel-2); padding: 4px 12px; border-radius: 999px; font-size: .85rem; color: var(--muted); }
.learn {
  background: var(--learn-bg); border-left: 4px solid var(--accent);
  padding: 12px 16px; border-radius: 8px; line-height: 1.5;
}
.learn code, .task code { background: var(--learn-code); padding: 1px 6px; border-radius: 4px; font-family: var(--mono); }
.task { color: var(--muted); }

.code {
  background: var(--code-bg); border: 1px solid var(--border); border-radius: 12px;
  padding: 24px; font-family: var(--mono); font-size: 1.5rem; line-height: 1.7;
  white-space: pre-wrap; word-break: break-all; min-height: 100px;
}
.code .todo { color: var(--todo); }
.code .done { color: var(--ok); }
.code .cur { background: var(--accent); color: var(--on-accent); border-radius: 3px; animation: blink 1s infinite; }
.code .cur.err { background: var(--bad); color: #fff; animation: none; }
.code .nl { font-size: .8em; opacity: .6; }
.code .nl.done { opacity: .25; }
@keyframes blink { 50% { opacity: .55; } }
.code .gap { color: var(--star); border-bottom: 2px dashed var(--star); }
.code .gap.ok { color: var(--ok); border-color: var(--ok); }

.stats { display: flex; gap: 14px; margin-top: 16px; }
.stats div {
  flex: 1; background: var(--panel); border-radius: 12px; padding: 14px; text-align: center;
  display: flex; flex-direction: column;
}
.stats b { font-size: 1.6rem; color: var(--accent); }
.stats small { color: var(--muted); }

.answer { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 10px; }
.answer input {
  flex: 1 1 260px; background: var(--code-bg); border: 2px solid var(--border); border-radius: 10px;
  color: var(--text); padding: 12px 14px; font-family: var(--mono); font-size: 1.2rem; outline: none;
}
.answer input:focus { border-color: var(--accent); }
.btn { background: var(--accent); color: var(--on-accent); font-weight: 700; padding: 12px 20px; border-radius: 10px; }
.btn:hover { filter: brightness(1.1); }
.btn.ghost { background: var(--panel-2); color: var(--text); }
.feedback { width: 100%; margin: 4px 0 0; min-height: 1.4em; color: var(--muted); }
.feedback.ok { color: var(--ok); font-weight: 700; }
.feedback.bad { color: var(--bad); }
.shake { animation: shake .35s; }
@keyframes shake { 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }

.help-row { margin-top: 12px; display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.help-row .feedback { width: auto; flex: 1; margin: 0; }
.muted { color: var(--muted); }

/* Worlds + race on the level map */
.world { margin: 28px 0 12px; color: var(--accent); font-size: 1.05rem; text-transform: uppercase; letter-spacing: 1px; }
.race-card {
  width: 100%; display: flex; align-items: center; gap: 16px; text-align: left;
  background: var(--race-bg); border-radius: 14px; padding: 16px 20px;
  border: 2px solid transparent; transition: border-color .15s, transform .15s;
}
.race-card:hover { border-color: #fb923c; transform: translateY(-2px); }
.race-card .race-icon { font-size: 2.2rem; }
.race-card b { display: block; font-size: 1.15rem; }
.race-card small { color: var(--race-text); }

/* Labels above code / output */
.code-label { color: var(--muted); font-size: .85rem; margin: 14px 0 6px; }
.code-label:empty { display: none; }

/* Quiz */
.quiz { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin-top: 16px; }
.opt {
  background: var(--panel); border: 2px solid var(--border); border-radius: 12px; padding: 16px;
  font-family: var(--mono); font-size: 1.15rem; transition: border-color .15s;
}
.opt:hover:not(:disabled) { border-color: var(--accent); }
.opt.ok { border-color: var(--ok); background: var(--ok-bg); }
.opt.bad { border-color: var(--bad); background: var(--bad-bg); opacity: .7; cursor: not-allowed; }

/* Write & run */
#editor {
  width: 100%; min-height: 180px; resize: vertical; background: var(--code-bg); color: var(--text);
  border: 2px solid var(--border); border-radius: 12px; padding: 16px; outline: none;
  font-family: var(--mono); font-size: 1.1rem; line-height: 1.6; tab-size: 4;
}
#editor:focus { border-color: var(--accent); }
.run-actions { display: flex; align-items: center; gap: 10px; margin-top: 10px; flex-wrap: wrap; }
.btn:disabled { opacity: .5; cursor: wait; }
.output {
  background: var(--code-bg); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; margin: 0;
  font-family: var(--mono); min-height: 52px; white-space: pre-wrap; color: var(--muted);
}
.output.ok { border-color: var(--ok); color: var(--ok); }
.output.bad { border-color: var(--bad); color: var(--bad-text); }

/* Result */
.result-card { background: var(--panel); border-radius: 20px; padding: 40px 24px; text-align: center; max-width: 480px; margin: 40px auto; }
.stars { font-size: 3.5rem; letter-spacing: 8px; color: var(--star-off); }
.stars .on { color: var(--star); text-shadow: 0 0 18px rgba(250, 204, 21, .5); }
.result-card p { color: var(--muted); }
.result-actions { display: flex; gap: 12px; justify-content: center; margin-top: 20px; flex-wrap: wrap; }

/* Welcome / players */
.players { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 12px; margin-bottom: 28px; }
.player {
  background: var(--panel); border: 2px solid transparent; border-radius: 16px; padding: 18px 10px;
  display: flex; flex-direction: column; align-items: center; gap: 4px;
}
.player:hover { border-color: var(--accent); }
.player small { color: var(--muted); }
.avatar { font-size: 2.2rem; }
.avatar.big { font-size: 3.6rem; }
/* Welcome choices */
.choices { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.choice {
  background: var(--panel); border: 2px solid transparent; border-radius: 18px; padding: 28px 18px;
  display: flex; flex-direction: column; align-items: center; gap: 6px; text-align: center;
  transition: transform .15s, border-color .15s;
}
.choice:hover { transform: translateY(-4px); border-color: var(--accent); }
.choice .ci { font-size: 2.8rem; }
.choice b { font-size: 1.15rem; }
.choice small { color: var(--muted); }

/* Panels + forms */
.panel { background: var(--panel); border-radius: 16px; padding: 20px; }
.narrow { max-width: 420px; margin-left: auto; margin-right: auto; }
.center { text-align: center; align-items: center; }
.form { max-width: 460px; margin: 0 auto; display: flex; flex-direction: column; gap: 10px; }
.form h3 { margin: 0; }
.form input, .form select {
  width: 100%; background: var(--code-bg); border: 2px solid var(--border); border-radius: 10px; color: var(--text);
  padding: 12px 14px; font: inherit; font-size: 1.05rem; outline: none;
}
.form input:focus, .form select:focus { border-color: var(--accent); }
.field { display: flex; flex-direction: column; gap: 6px; font-weight: 600; font-size: .95rem; }
.pin-input { text-align: center; font-size: 2rem !important; letter-spacing: 14px; max-width: 220px; }
.form-links { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.link { background: none; color: var(--accent); padding: 4px 0; font-size: .95rem; }
.link:hover { text-decoration: underline; }
.username-status { font-size: .9rem; color: var(--muted); min-height: 1.2em; margin-top: -4px; }
.username-status.ok { color: var(--ok); }
.username-status.bad { color: var(--bad); }
.username-status .chip { cursor: pointer; }
.parent-box { background: var(--learn-bg); border-radius: 10px; padding: 10px 12px; display: flex; flex-direction: column; gap: 8px; }
.parent-box[hidden] { display: none; }
.parent-box .small { margin: 0; }
.ok-note { color: var(--ok); margin: 0; }
.big-msg { font-size: 1.15rem; line-height: 1.5; }
.avatars { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; }
.av { background: var(--panel-2); border: 2px solid transparent; border-radius: 12px; font-size: 1.6rem; padding: 6px 0; }
.av.on { border-color: var(--accent); background: var(--learn-bg); }
.small { font-size: .85rem; margin: 4px 0 0; }

/* Home: greeting + continue */
.hello { color: var(--muted); margin: 0 0 10px; font-size: 1.05rem; }
.continue {
  width: 100%; display: flex; align-items: center; gap: 16px; text-align: left; margin-bottom: 18px;
  background: var(--continue-bg); border-radius: 14px; padding: 16px 20px;
  border: 2px solid transparent;
}
.continue:hover { border-color: var(--ok); }
.continue b { display: block; font-size: 1.15rem; }
.continue small { color: var(--continue-text); }

/* Ranks */
.ranks { list-style: none; padding: 0; margin: 0 0 24px; display: flex; flex-direction: column; gap: 8px; }
.ranks li { display: flex; align-items: center; gap: 12px; background: var(--panel); border-radius: 12px; padding: 10px 16px; }
.ranks li.me { border: 2px solid var(--accent); }
.ranks .pos { width: 32px; text-align: center; font-size: 1.3rem; font-weight: 700; }
.ranks .avatar { font-size: 1.6rem; }
.ranks .val { margin-left: auto; color: var(--accent); font-weight: 700; white-space: nowrap; }

/* Me */
.me-head { display: flex; align-items: center; gap: 16px; }
.me-head h2 { margin: 0; }
.lang-row { display: flex; align-items: center; gap: 12px; background: var(--panel); border-radius: 10px; padding: 10px 14px; margin-bottom: 8px; }
.lang-row > span { min-width: 120px; }
.lang-row > b { margin-left: auto; color: var(--accent); }
.bar { flex: 1; height: 10px; background: var(--panel-2); border-radius: 999px; overflow: hidden; }
.bar i { display: block; height: 100%; border-radius: 999px; }
.me-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.btn.danger { background: var(--bad-bg); color: var(--bad-text); }

/* Phone typing: hidden input + symbol bar */
.type-input {
  position: fixed; top: 30%; left: 0; width: 1px; height: 1px; opacity: 0;
  border: 0; padding: 0; font-size: 16px; pointer-events: none;
}
.tap-hint { display: none; text-align: center; color: var(--muted); font-size: .9rem; margin: 8px 0 0; }
.symbar {
  display: none; position: fixed; left: 0; right: 0; bottom: 0; z-index: 30;
  gap: 6px; padding: 6px 8px; overflow-x: auto; background: var(--panel); border-top: 1px solid var(--border);
}
.symbar button {
  flex: 0 0 auto; min-width: 42px; height: 42px; border-radius: 8px; background: var(--panel-2);
  font-family: var(--mono); font-size: 1.15rem; font-weight: 700;
}
.symbar button:active { background: var(--accent); color: var(--on-accent); }
body.touch.playing.symbols .symbar { display: flex; }
body.touch.playing.symbols main { padding-bottom: 80px; }
body.touch .kbd-only { display: none; }

@media (max-width: 700px) {
  /* Bottom menu on phones, like an app */
  .topbar { padding: 10px 16px; }
  .nav {
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 25;
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
    background: var(--panel); border-top: 1px solid var(--border);
    padding: 6px 4px calc(6px + env(safe-area-inset-bottom));
  }
  .nav button { flex-direction: column; gap: 2px; font-size: .75rem; padding: 6px 0; background: none !important; }
  .nav .ni { font-size: 1.4rem; }
  main { padding-bottom: 100px; }
  body.playing .nav { display: none; }
}

@media (max-width: 600px) {
  h1 { font-size: 1.8rem; }
  .code { font-size: 1.1rem; padding: 16px; }
  .lang-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .lang-card { padding: 18px 10px; }
  .lang-card .icon { font-size: 2.4rem; }
  .level-grid { grid-template-columns: repeat(2, 1fr); }
  .lang-row > span { min-width: 96px; }
}