/* Program Booly: AlgoCademy's paper-and-ink palette (the same as the Booly videos), a dark code editor. */
:root {
  --bg: #F8F9F5; --panel: #FFFFFF; --panel2: #EDF1E9; --line: #DDE3DC; --ink: #172E36; --muted: #59696B;
  --cyan: #076B95; --cyan-ink: #054F6E; --green: #4F7A1E; --red: #C2412B; --amber: #A2620A; --lime: #D8EE98; --blue-soft: #E4EFF3;
  --ed-bg: #161B2B; --ed-gutter: #121726; --ed-text: #D7DCE7;
  --sans: Inter, system-ui, -apple-system, "Segoe UI", sans-serif; --mono: "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--ink); font: 16px/1.5 var(--sans); -webkit-font-smoothing: antialiased;
  background-image: radial-gradient(rgba(23,46,54,0.07) 1.2px, transparent 1.4px); background-size: 30px 30px; }
button { font: inherit; color: inherit; }
a { color: var(--cyan); }
h1, h2 { text-wrap: balance; }

.top { display: flex; align-items: center; gap: 12px; padding: 12px max(16px, env(safe-area-inset-left)); }
.logo img { height: 26px; display: block; }
.eyebrow { font: 700 12px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--cyan); }
.small { color: var(--muted); font-size: 14px; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; border: 2px solid var(--ink); background: var(--panel); border-radius: 12px;
  padding: 9px 15px; font-weight: 700; font-size: 15px; cursor: pointer; text-decoration: none; color: var(--ink); box-shadow: 0 3px 0 rgba(23,46,54,0.18); }
.btn:hover:not(:disabled) { transform: translateY(-1px); }
.btn:active:not(:disabled) { transform: translateY(1px); box-shadow: none; }
.btn:disabled { opacity: .45; cursor: default; }
.btn:focus-visible, .chip:focus-visible, .level-tile:focus-visible, .room-tab:focus-visible { outline: 3px solid var(--cyan); outline-offset: 2px; }
.btn.primary { background: var(--cyan); border-color: var(--cyan-ink); color: #fff; }
.btn.stop { background: var(--red); border-color: #8E2D1E; color: #fff; }
.btn.big { padding: 13px 22px; font-size: 18px; border-radius: 14px; }
.btn.ghost { border-color: transparent; background: transparent; box-shadow: none; padding: 8px 10px; }
.btn.tiny { padding: 5px 9px; font-size: 13px; border-radius: 9px; box-shadow: none; }
.btn.tiny.on { background: var(--lime); }
.link { border: 0; background: none; padding: 0; color: var(--cyan); font-weight: 600; text-decoration: underline; cursor: pointer; }

.stars { display: inline-flex; gap: 2px; vertical-align: middle; }
.stars path { fill: #DDE3DC; stroke: var(--ink); stroke-width: 1.6; stroke-linejoin: round; }
.stars .on path { fill: #FFC531; }

/* ---- title ---- */
.title-screen { min-height: 100vh; }
.title-body { max-width: 1100px; margin: 0 auto; padding: 24px max(16px, env(safe-area-inset-left)) 48px; display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 32px; align-items: center; }
.title-text h1 { font-size: clamp(44px, 7vw, 76px); line-height: 1; margin: 12px 0 16px; letter-spacing: -0.02em; font-weight: 900; }
.title-text h1 span { color: var(--cyan); }
.lede { font-size: 19px; color: var(--muted); max-width: 34em; margin: 0 0 24px; }
.title-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 14px; }
.title-booly { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.title-booly .bubble { max-width: 360px; }
/* Under the title: the chapters, how it works and questions (also in the page's HTML for search engines). */
.about { max-width: 1100px; margin: 0 auto; padding: 0 max(16px, env(safe-area-inset-left)) 56px; }
.about h2 { font-size: 22px; margin: 0 0 12px; }
.learn-list { list-style: none; margin: 0 0 32px; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.learn-list li { background: var(--panel); border: 2px solid var(--line); border-radius: 16px; padding: 14px; display: flex; flex-direction: column; gap: 4px; }
.learn-list .ch-num { font: 700 11px/1.3 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--cyan); }
.learn-list b { font-size: 17px; }
.learn-list li > span:last-child { color: var(--muted); font-size: 15px; }
.about-cols { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr); gap: 32px; }
.about ul { margin: 0; padding-left: 20px; color: var(--muted); }
.about ul li { margin-bottom: 6px; }
.faq { margin: 0; }
.faq dt { font-weight: 700; }
.faq dd { margin: 2px 0 12px; color: var(--muted); }
@media (max-width: 820px) {
  .title-body { grid-template-columns: minmax(0, 1fr); gap: 8px; padding-top: 8px; }
  .title-booly .portrait { transform: scale(.8); transform-origin: 50% 0; margin-bottom: -80px; }
  .learn-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .about-cols { grid-template-columns: minmax(0, 1fr); gap: 8px; }
}
@media (max-width: 480px) { .learn-list { grid-template-columns: minmax(0, 1fr); } }

/* ---- levels ---- */
.levels-screen { max-width: 1000px; margin: 0 auto; padding: 0 max(16px, env(safe-area-inset-left)) 48px; }
.levels-screen > .top { padding-left: 0; padding-right: 0; }
.levels-screen h1 { font-size: 34px; margin: 8px 0 18px; }
.chapter { background: var(--panel); border: 2px solid var(--line); border-radius: 18px; padding: 18px; margin-bottom: 16px; }
.chapter.locked .chapter-head { opacity: .55; }
.chapter-head h2 { margin: 2px 0 2px; font-size: 22px; }
.chapter-head p { margin: 0 0 12px; color: var(--muted); }
.ch-num { font: 700 12px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.level-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.level-tile { display: flex; flex-direction: column; align-items: flex-start; gap: 4px; text-align: left; padding: 12px; border-radius: 14px; border: 2px solid var(--ink);
  background: var(--panel); cursor: pointer; box-shadow: 0 3px 0 rgba(23,46,54,0.15); }
.level-tile.done { background: #F5FAE8; }
.level-tile.locked { border-color: var(--line); box-shadow: none; cursor: default; color: var(--muted); }
.lt-id { font: 700 13px var(--mono); color: var(--cyan); }
.level-tile.locked .lt-id { color: var(--muted); }
.lt-name { font-weight: 700; }
.lt-lock { font-size: 13px; }

/* ---- play ---- */
.play-top { flex-wrap: wrap; row-gap: 4px; }
.lvl-title { flex: 1; font-weight: 800; font-size: 18px; text-align: center; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.lvl-id { font: 700 15px var(--mono); color: var(--cyan); margin-right: 4px; }
.play-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 18px; padding: 0 max(16px, env(safe-area-inset-left)) 28px; max-width: 1440px; margin: 0 auto; align-items: start; }
.stage, .code-panel { min-width: 0; }
.stage { background: var(--panel); border: 2px solid var(--line); border-radius: 20px; padding: 14px; display: flex; flex-direction: column; gap: 10px; }
.goals { display: flex; flex-wrap: wrap; gap: 6px; }
.goal { font-size: 13px; font-weight: 700; color: var(--muted); background: var(--panel2); border-radius: 999px; padding: 4px 10px; }
.goal.got { background: var(--lime); color: var(--ink); }
.rooms { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.room-tab { border: 2px solid var(--ink); background: var(--panel); border-radius: 10px; padding: 4px 10px; font-weight: 700; font-size: 14px; cursor: pointer; }
.room-tab.on { background: var(--ink); color: #fff; }
.room-tab.ok { border-color: var(--green); }
.room-tab.on.ok { background: var(--green); }
.room-tab.bad { border-color: var(--red); }
.room-tab.on.bad { background: var(--red); }
.room-tab:disabled { cursor: default; }
.rooms-note { font-size: 13px; color: var(--muted); margin-left: 4px; }
.room-wrap { background: #DCE5E8; border-radius: 14px; padding: 10px; display: flex; justify-content: center; }
.room { display: block; width: 100%; height: auto; max-height: min(50vh, 540px); }
.talk { display: flex; align-items: flex-end; gap: 6px; }
.portrait { flex: none; overflow: hidden; }
.portrait svg { display: block; }
.bubble { position: relative; flex: 1; background: var(--panel); border: 3px solid var(--ink); border-radius: 18px; padding: 11px 15px; font-weight: 600; font-size: 16px; line-height: 1.4;
  margin-bottom: 26px; box-shadow: 0 5px 0 rgba(23,46,54,0.12); min-height: 52px; }
.talk .bubble::before { content: ''; position: absolute; left: -14px; bottom: 14px; border: 8px solid transparent; border-right: 12px solid var(--ink); }
.title-booly .bubble { margin-bottom: 0; }
.title-booly .bubble::before { content: ''; position: absolute; left: 50%; bottom: -17px; border: 8px solid transparent; border-top: 12px solid var(--ink); }
.bubble.bad { border-color: var(--red); background: #FFF4F1; }
.talk .bubble.bad::before { border-right-color: var(--red); }
.bubble.good { border-color: var(--green); background: #F4FAE6; }
.talk .bubble.good::before { border-right-color: var(--green); }
.bubble.info { border-color: var(--cyan); background: #EFF6F9; }
.talk .bubble.info::before { border-right-color: var(--cyan); }

.code-panel { display: flex; flex-direction: column; gap: 12px; }
.teach { background: var(--panel); border: 2px solid var(--ink); border-radius: 16px; overflow: hidden; }
.teach-head { width: 100%; display: flex; align-items: center; gap: 8px; border: 0; background: none; padding: 10px 14px; font-weight: 800; font-size: 16px; cursor: pointer; text-align: left; }
.teach-head .new { font: 700 11px var(--mono); letter-spacing: .1em; text-transform: uppercase; background: var(--lime); border: 2px solid var(--ink); border-radius: 8px; padding: 2px 7px; }
.teach-head .chev { margin-left: auto; font: 700 20px var(--mono); color: var(--muted); }
.teach-body { padding: 0 14px 12px; }
.teach-body p { margin: 0 0 8px; }
.teach-body pre { margin: 0; background: var(--ed-bg); color: var(--ed-text); font: 15px/1.55 var(--mono); padding: 10px 14px; border-radius: 10px; overflow-x: auto; }

.editor { display: flex; background: var(--ed-bg); border: 2px solid #0B0F1A; border-radius: 16px; overflow: auto; max-height: 48vh; font: 16px/1.6 var(--mono); }
.gutter { position: sticky; left: 0; z-index: 2; flex: none; background: var(--ed-gutter); color: #5D6680; padding: 12px 8px 12px 10px; text-align: right; min-width: 2.8em; user-select: none; }
.gl.is-active { color: var(--lime); font-weight: 700; }
.gl.is-error { color: #FF8C78; font-weight: 700; }
.code { position: relative; flex: 1 0 auto; min-width: 0; }
.code-hl { margin: 0; padding: 12px 14px; white-space: pre; color: var(--ed-text); font: inherit; pointer-events: none; min-height: calc(1.6em * 9 + 24px); }
.hl { min-height: 1.6em; border-radius: 4px; margin: 0 -6px; padding: 0 6px; }
.hl.is-active { background: rgba(167, 207, 78, 0.24); }
.hl.is-error { background: rgba(240, 96, 77, 0.32); }
.code textarea { position: absolute; inset: 0; width: 100%; height: 100%; margin: 0; padding: 12px 14px; border: 0; outline: 0; resize: none; background: transparent;
  color: transparent; -webkit-text-fill-color: transparent; caret-color: #FFFFFF; font: inherit; line-height: inherit; white-space: pre; overflow: hidden; tab-size: 4; }
.code textarea::selection { background: rgba(134, 170, 250, 0.4); }
.editor:focus-within { border-color: var(--cyan); }
.c-kw { color: #86AAFA; font-weight: 600; }
.c-cmd { color: #A7CF4E; }
.c-sen { color: #F5B83D; }
.c-num { color: #F0A35E; }
.c-str { color: #E6B8F0; }
.c-com { color: #7D879C; font-style: italic; }

.palette { display: flex; flex-wrap: wrap; gap: 7px; }
.chip { font: 600 14px var(--mono); background: var(--panel); border: 2px solid var(--ink); border-radius: 10px; padding: 6px 10px; cursor: pointer; box-shadow: 0 2px 0 rgba(23,46,54,0.15); }
.chip.block { background: var(--blue-soft); }
.chip.inline { background: #FFF6DA; border-style: dashed; }
.chip:active { transform: translateY(1px); box-shadow: none; }
.controls { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.btn.run { min-width: 132px; font-size: 16px; }
.speed { margin-left: auto; display: flex; gap: 4px; }
.meta { display: flex; flex-wrap: wrap; gap: 6px 16px; align-items: center; font-size: 14px; color: var(--muted); }
.par { font-weight: 700; }
.par.ok { color: var(--green); }
.keys { margin-left: auto; font: 12px var(--mono); }
@media (hover: none), (pointer: coarse) { .keys { display: none; } }

.overlay { position: fixed; inset: 0; background: rgba(23, 46, 54, 0.55); display: flex; align-items: center; justify-content: center; padding: 16px; z-index: 10; animation: fade .2s ease; }
@keyframes fade { from { opacity: 0; } }
.card { background: var(--panel); border: 3px solid var(--ink); border-radius: 22px; padding: 22px; box-shadow: 0 20px 60px rgba(0,0,0,0.3); max-height: calc(100vh - 32px); overflow: auto; }
.win-card { display: flex; gap: 18px; align-items: flex-start; max-width: 720px; animation: pop .3s cubic-bezier(.2,.9,.3,1.3); }
@keyframes pop { from { transform: scale(.9); opacity: 0; } }
.win-text h2 { margin: 6px 0 10px; font-size: 24px; line-height: 1.2; }
.win-list { list-style: none; padding: 0; margin: 12px 0; color: var(--muted); font-weight: 600; }
.win-list li { margin: 3px 0; }
.win-list li.got { color: var(--green); }
.chapter-done { background: #F4FAE6; border: 2px solid var(--green); border-radius: 12px; padding: 10px 12px; margin: 0 0 14px; }
.chapter-done p { margin: 8px 0 0; }
.win-actions { display: flex; flex-wrap: wrap; gap: 8px; }

@media (max-width: 959px) {
  .play-grid { grid-template-columns: minmax(0, 1fr); gap: 12px; padding: 0 12px 24px; }
  .room { max-height: 42vh; }
  .editor { max-height: none; }
  .code-hl { min-height: calc(1.6em * 6 + 24px); }
}
@media (max-width: 600px) {
  .top { padding: 10px 12px; gap: 6px; }
  .logo img { height: 22px; }
  .lvl-title { font-size: 16px; text-align: left; }
  .stage { padding: 10px; border-radius: 16px; }
  .bubble { font-size: 15px; padding: 9px 12px; }
  .win-card { flex-direction: column; align-items: center; text-align: center; }
  .win-list, .win-actions { justify-content: center; }
  .speed { margin-left: 0; }
}