/* Pyviel editor. Warm paper colours, plain borders, no build step. */
:root {
  color-scheme: light;
  --bg: #f4ecdc;
  --card: #fffaf0;
  --ink: #2b2420;
  --muted: #756a5e;
  --line: #d8ccb6;
  --edge: #2b2420;
  --accent: #e8572a;
  --accent-soft: #fde3d6;
  --go: #2f9e4f;
  --go-ink: #ffffff;
  --stop: #d23b3b;
  --warn: #a96a00;
  --err: #c52f2f;
  --ok: #26803f;
  --screen: #26211d;
  --screen-ink: #f7efe0;
  --screen-muted: #a69a8a;
  --active: #f6ead0;
  --tok-keyword: #b32d5d;
  --tok-string: #2b7a3d;
  --tok-number: #1d5fb0;
  --tok-comment: #968a7b;
  --tok-value: #8647b8;
  --tok-operator: #77695b;
  --code-size: 15px;
  --code-line: 26px;
  --code-font: var(--code-size)/var(--code-line) ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --ui: ui-rounded, "SF Pro Rounded", "Nunito", "Segoe UI", system-ui, sans-serif;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #1e1a17;
  --card: #29241f;
  --ink: #f3eadb;
  --muted: #b0a392;
  --line: #433a31;
  --edge: #6d6050;
  --accent: #ff8a5c;
  --accent-soft: #46291d;
  --go: #3fb663;
  --go-ink: #0f2416;
  --stop: #ef6a6a;
  --warn: #e9b350;
  --err: #ff8a85;
  --ok: #6fd18a;
  --screen: #141110;
  --active: #332c25;
  --tok-keyword: #ff8fb1;
  --tok-string: #8ed99f;
  --tok-number: #8fbaf5;
  --tok-comment: #8a7e70;
  --tok-value: #c9a2f2;
  --tok-operator: #b5a595;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { height: 100%; margin: 0; }
body { background: var(--bg); color: var(--ink); font: 15px/1.5 var(--ui); display: flex; flex-direction: column; overflow: hidden; }
button, input, select { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; padding: 0; }
select { cursor: pointer; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }
kbd { font: 12px/1.5 ui-monospace, Menlo, monospace; background: var(--card); border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 5px; padding: 0 5px; white-space: nowrap; }
code { font: .92em ui-monospace, "SF Mono", Menlo, monospace; background: var(--accent-soft); padding: 1px 5px; border-radius: 4px; }
.spacer { flex: 1; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.dot { width: 8px; height: 8px; background: var(--go); border-radius: 50%; display: inline-block; flex-shrink: 0; }

/* Top bar */
.topbar { flex-shrink: 0; display: flex; align-items: center; gap: 10px; padding: 10px 18px; background: var(--card); border-bottom: 2px solid var(--edge); }
.brand-beta { font-size: 10px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; padding: 2px 6px; border-radius: 999px; background: var(--accent-soft, #e7f0e4); color: var(--ink); align-self: center; }
.engine { font-size: 11px; color: var(--muted, #7a7469); }
.brand { display: flex; align-items: center; gap: 9px; color: var(--ink); font-size: 21px; font-weight: 800; text-decoration: none; margin-right: 6px; }
.logo { width: 34px; height: 34px; stroke-width: 3; }
.filebox { display: flex; align-items: center; gap: 8px; min-width: 0; }
#file-name { width: 190px; max-width: 28vw; padding: 6px 10px; background: transparent; border: 2px solid transparent; border-radius: 8px; font-weight: 600; text-overflow: ellipsis; }
#file-name:hover { border-color: var(--line); }
#file-name:focus { border-color: var(--accent); outline: none; background: var(--bg); }
.edited { font-size: 12px; color: var(--warn); font-weight: 600; white-space: nowrap; }
.file-tools { display: flex; gap: 2px; padding-left: 10px; margin-left: 4px; border-left: 2px solid var(--line); }
.tool { display: inline-flex; align-items: center; gap: 7px; padding: 7px 11px; border-radius: 9px; font-weight: 600; color: var(--ink); }
.tool:hover { background: var(--accent-soft); }
.tool[aria-expanded="true"] { background: var(--accent-soft); }
.tool.icon-only { padding: 7px 9px; }
/* Get the desktop app: the same editor, offline. */
.download { box-shadow: inset 0 0 0 2px var(--accent); color: var(--accent); }
.download:hover { background: var(--accent); color: #fff; }
[data-desktop] #download, [data-desktop] .brand-web { display: none !important; }
.brand-web { align-self: center; margin-left: 4px; font-size: 10px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; padding: 2px 6px; border-radius: 999px; border: 1.5px solid var(--edge); color: var(--ink); }
.run, .stop { display: inline-flex; align-items: center; gap: 8px; height: 42px; padding: 0 20px; border: 2px solid var(--edge); border-radius: 12px; font-weight: 800; font-size: 17px; box-shadow: 0 3px 0 var(--edge); transition: transform .08s, box-shadow .08s; }
.run svg, .stop svg { width: 16px; height: 16px; }
.run { background: var(--go); color: var(--go-ink); }
.stop { background: var(--card); color: var(--stop); }
.run:hover, .stop:hover { transform: translateY(1px); box-shadow: 0 2px 0 var(--edge); }
.run:active, .stop:active { transform: translateY(3px); box-shadow: 0 0 0 var(--edge); }
.run[aria-busy="true"] { opacity: .5; pointer-events: none; }

.app-shell { display: flex; flex: 1; min-height: 0; }

/* Lessons panel */
.learn { width: 370px; flex-shrink: 0; display: flex; flex-direction: column; background: var(--card); border-right: 2px solid var(--edge); min-height: 0; }
.learn-head { display: flex; align-items: center; justify-content: space-between; padding: 12px 14px 0; border-bottom: 2px solid var(--line); }
.tabs { display: flex; gap: 4px; }
.tabs button { padding: 8px 14px; font-weight: 700; color: var(--muted); border-bottom: 3px solid transparent; margin-bottom: -2px; }
.tabs button:hover { color: var(--ink); }
.tabs button[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--accent); }
.learn-head .icon-button { margin-bottom: 6px; }
.learn-body { flex: 1; overflow: auto; padding: 16px; }
.learn-intro { margin: 0 0 14px; color: var(--muted); }

.lesson-list { display: flex; flex-direction: column; gap: 8px; }
.tutorial-lesson { display: flex; align-items: center; gap: 12px; text-align: left; padding: 11px 12px; border: 2px solid var(--line); border-radius: 12px; background: var(--bg); width: 100%; }
.tutorial-lesson:hover { border-color: var(--edge); }
.tutorial-lesson[aria-current="true"] { border-color: var(--accent); background: var(--accent-soft); }
.lesson-number { width: 32px; height: 32px; flex-shrink: 0; display: inline-flex; align-items: center; justify-content: center; font-weight: 800; background: var(--card); border: 2px solid var(--edge); border-radius: 50%; font-size: 14px; }
.tutorial-lesson.done .lesson-number { background: var(--go); color: var(--go-ink); }
.lesson-text { display: flex; flex-direction: column; min-width: 0; flex: 1; line-height: 1.3; }
.lesson-title { font-weight: 700; }
.lesson-text small { color: var(--muted); font-size: 13px; }
.lesson-count { font-size: 12px; color: var(--muted); white-space: nowrap; }

.tutorial-step { display: flex; flex-direction: column; gap: 12px; }
.back-link { align-self: flex-start; color: var(--muted); font-weight: 600; padding: 2px 0; }
.back-link:hover { color: var(--ink); }
.progress { display: flex; gap: 5px; }
.progress i { flex: 1; height: 7px; border-radius: 4px; background: var(--line); }
.progress i.on { background: var(--accent); }
.progress i.here { background: var(--accent); outline: 2px solid var(--edge); outline-offset: 1px; }
.step-count { font-size: 13px; color: var(--muted); font-weight: 600; }
.tutorial-step h3 { margin: 0; font-size: 22px; line-height: 1.2; }
.tutorial-text { margin: 0; font-size: 16px; line-height: 1.55; }
.tutorial-code { margin: 0; padding: 12px 14px; background: var(--screen); color: var(--screen-ink); border-radius: 10px; font: 14px/1.6 ui-monospace, "SF Mono", Menlo, monospace; overflow: auto; white-space: pre; }
.your-turn { margin: 0; padding: 10px 12px; background: var(--accent-soft); border-radius: 10px; border-left: 5px solid var(--accent); }
.your-turn b { display: block; font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--accent); margin-bottom: 2px; }
.step-actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.btn { display: inline-flex; align-items: center; gap: 7px; height: 38px; padding: 0 14px; border: 2px solid var(--edge); border-radius: 10px; font-weight: 700; background: var(--card); }
.btn:hover:not(:disabled) { background: var(--accent-soft); }
.btn:disabled { opacity: .35; cursor: default; }
.btn.primary { background: var(--accent); color: #fff; box-shadow: 0 3px 0 var(--edge); }
.btn.primary:hover { background: var(--accent); filter: brightness(1.06); }
.listen { align-self: flex-start; height: 34px; padding: 0 12px; font-size: 14px; }
.listen svg { width: 16px; height: 16px; }
.listen[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); }
.nav-row { display: flex; gap: 8px; justify-content: space-between; padding-top: 6px; border-top: 2px dashed var(--line); }
.restore-code { align-self: flex-start; color: var(--muted); text-decoration: underline; text-underline-offset: 3px; font-size: 13px; }
.restore-code:hover { color: var(--ink); }

.example-list { display: grid; gap: 8px; }
.example-list button { text-align: left; padding: 10px 13px; border: 2px solid var(--line); border-radius: 12px; background: var(--bg); display: flex; flex-direction: column; line-height: 1.3; }
.example-list button:hover { border-color: var(--edge); }
.example-list button[aria-current="true"] { border-color: var(--accent); background: var(--accent-soft); }
.example-list span { color: var(--muted); font-size: 13px; }

/* Workspace */
.workspace { flex: 1; min-width: 0; display: flex; flex-direction: column; padding: 14px 16px 0; }
.mobile-examples { display: none; align-items: center; gap: 8px; margin-bottom: 10px; }
.mobile-examples select { flex: 1; padding: 7px 10px; background: var(--card); border: 2px solid var(--edge); border-radius: 9px; }
.workbench { flex: 1; min-height: 0; display: flex; gap: 14px; }
.editor, .pane { background: var(--card); border: 2px solid var(--edge); border-radius: 14px; overflow: hidden; display: flex; flex-direction: column; min-width: 0; }
.editor { flex: 1.3; min-height: 0; }
.side { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 14px; }
.pane.output { flex: 1.6; min-height: 0; }
.pane.problems { flex: 1; min-height: 130px; }
.pane-head { display: flex; align-items: center; gap: 8px; padding: 8px 10px 8px 14px; border-bottom: 2px solid var(--line); min-height: 44px; }
.pane-head h2 { margin: 0; font-size: 15px; font-weight: 800; }
.icon-button { display: inline-flex; align-items: center; justify-content: center; min-width: 32px; height: 32px; border-radius: 8px; color: var(--muted); }
.icon-button:hover { background: var(--accent-soft); color: var(--ink); }
.aa { font-weight: 800; font-size: 15px; line-height: 1; }
.aa small { font-size: 11px; margin-left: 1px; }

.editor-body { flex: 1; min-height: 0; display: flex; position: relative; }
.gutter { width: 50px; padding: 14px 10px 40px 0; text-align: right; font: var(--code-font); color: var(--muted); opacity: .75; overflow: hidden; user-select: none; flex-shrink: 0; background: var(--bg); border-right: 2px solid var(--line); }
.gutter div { position: relative; }
.gutter div.error { color: var(--err); opacity: 1; font-weight: 800; }
.gutter div.warning { color: var(--warn); opacity: 1; font-weight: 800; }
.gutter div.error::before, .gutter div.warning::before { content: ""; position: absolute; width: 7px; height: 7px; border-radius: 50%; left: 7px; top: 10px; background: currentColor; }
.code-stack { position: relative; min-width: 0; flex: 1; overflow: hidden; isolation: isolate; }
#code, #highlight { margin: 0; border: 0; border-radius: 0; padding: 14px 18px 40px 14px; font: var(--code-font); font-variant-ligatures: none; letter-spacing: 0; tab-size: 4; white-space: pre; overflow: auto; position: absolute; inset: 0; width: 100%; height: 100%; text-align: left; }
#code { resize: none; outline: none; background: transparent; color: transparent; caret-color: var(--ink); z-index: 2; -webkit-text-fill-color: transparent; }
#code::selection { background: color-mix(in srgb, var(--accent) 30%, transparent); }
#highlight { pointer-events: none; color: var(--ink); z-index: 1; overflow: hidden; }
.active-line { position: absolute; left: 0; right: 0; height: var(--code-line); background: var(--active); z-index: 0; pointer-events: none; }
.tok-keyword { color: var(--tok-keyword); font-weight: 700; }
.tok-string { color: var(--tok-string); }
.tok-number { color: var(--tok-number); }
.tok-comment { color: var(--tok-comment); font-style: italic; }
.tok-value { color: var(--tok-value); }
.tok-operator { color: var(--tok-operator); }
.editor-foot { display: flex; align-items: center; gap: 12px; padding: 6px 14px; border-top: 2px solid var(--line); font-size: 13px; color: var(--muted); }

/* Symbols you cannot find on every keyboard, one tap away. */
.symbols { display: flex; align-items: center; gap: 4px; padding: 5px 8px; border-bottom: 2px solid var(--line); background: var(--bg); overflow-x: auto; scrollbar-width: none; }
.symbols button { flex: 0 0 auto; min-width: 30px; height: 30px; padding: 0 7px; border: 2px solid var(--line); border-radius: 8px; background: var(--card); color: var(--ink); font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 15px; font-weight: 700; line-height: 1; }
.symbols button:hover { border-color: var(--accent); background: var(--accent-soft); }
.symbols button:active { transform: translateY(1px); }
@media (max-width: 460px) { .symbols button { min-width: 28px; padding: 0 5px; } }
#save-state { display: inline-flex; align-items: center; gap: 6px; }

.find-bar { display: flex; align-items: center; gap: 6px; padding: 6px 10px; border-bottom: 2px solid var(--line); background: var(--bg); }
.find-bar input { flex: 1; min-width: 0; padding: 5px 9px; border: 2px solid var(--line); border-radius: 8px; background: var(--card); }
.find-bar input:focus { outline: none; border-color: var(--accent); }
.find-bar button { width: 28px; height: 28px; border-radius: 7px; font-weight: 700; }
.find-bar button:hover { background: var(--accent-soft); }
#find-count { font-size: 13px; color: var(--muted); min-width: 56px; text-align: right; }

/* Output looks like a little screen */
.pane.output { background: var(--screen); border-color: var(--edge); }
.pane.output .pane-head { border-bottom-color: #ffffff22; color: var(--screen-ink); }
.pane.output .icon-button { color: var(--screen-muted); }
.pane.output .icon-button:hover { background: #ffffff1a; color: var(--screen-ink); }
.output-body { position: relative; flex: 1; min-height: 0; overflow: auto; padding: 14px 16px; color: var(--screen-ink); }
.out { margin: 0; font: 15px/1.6 ui-monospace, "SF Mono", Menlo, monospace; white-space: pre-wrap; word-break: break-word; }
.output-placeholder { color: var(--screen-muted); }
.output-placeholder strong { display: block; color: var(--screen-ink); font-size: 17px; }
.output-placeholder p { margin: 2px 0 0; }
#execution-time { font-size: 12px; color: var(--screen-muted); }
.run-status { font-size: 13px; font-weight: 700; }
.run-status.live { color: #ffd37a; }
.answer-bar { margin-top: 12px; padding: 10px; background: #ffffff14; border-radius: 12px; border: 2px solid #ffd37a; }
.answer-bar label { display: block; font-weight: 700; margin-bottom: 6px; color: #ffd37a; white-space: pre-wrap; }
.answer-row { display: flex; gap: 8px; }
.answer-row input { flex: 1; min-width: 0; padding: 8px 11px; font-size: 16px; background: #fff; color: #2b2420; border: 0; border-radius: 8px; }
.answer-row input:focus { outline: 3px solid var(--accent); }
.answer-row button { padding: 0 16px; font-weight: 800; background: #ffd37a; color: #2b2420; border-radius: 8px; }
.answer-row button:hover { filter: brightness(1.08); }
@keyframes shake { 25% { transform: translateX(-5px); } 75% { transform: translateX(5px); } }

/* Problems */
.pane-body { flex: 1; min-height: 0; overflow: auto; }
.count { font-size: 13px; color: var(--muted); }
.diagnostic-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--line); }
.diagnostic-dot.good { background: var(--go); }
.diagnostic-dot.warn { background: var(--warn); }
.pane.problems .pane-body { padding: 6px; }
.empty { padding: 8px; color: var(--muted); }
.ok { padding: 8px; color: var(--ok); font-weight: 700; }
.problem { display: flex; gap: 10px; width: 100%; text-align: left; padding: 8px 10px; border-radius: 9px; align-items: flex-start; }
.problem:hover { background: var(--accent-soft); }
.problem .where { flex-shrink: 0; font-weight: 800; font-size: 12px; padding: 2px 8px; border-radius: 6px; background: var(--bg); border: 1px solid var(--line); margin-top: 1px; }
.problem.error .where { color: var(--err); border-color: var(--err); }
.problem.warning .where { color: var(--warn); border-color: var(--warn); }
.problem .kind { font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
.problem.error .kind { color: var(--err); }
.problem.warning .kind { color: var(--warn); }
.problem .msg { line-height: 1.4; }
.problem .hint { color: var(--muted); font-size: 13px; }
.summary { padding: 7px 14px; border-top: 2px solid var(--line); font-size: 13px; color: var(--muted); }
.summary.ok { color: var(--ok); font-weight: 700; padding: 7px 14px; }

.workspace-footer { display: flex; align-items: center; padding: 8px 2px 10px; font-size: 13px; color: var(--muted); }
.workspace-footer button { color: var(--muted); text-decoration: underline; text-underline-offset: 3px; }
.workspace-footer button:hover { color: var(--ink); }

/* Dialog */
dialog { width: min(920px, calc(100vw - 28px)); max-height: calc(100vh - 28px); padding: 0; background: var(--card); color: var(--ink); border: 2px solid var(--edge); border-radius: 18px; box-shadow: 0 8px 0 var(--edge); }
dialog::backdrop { background: #2b242088; }
.dialog-head { display: flex; align-items: center; justify-content: space-between; padding: 14px 20px; border-bottom: 2px solid var(--line); position: sticky; top: 0; background: var(--card); }
.dialog-head h2 { margin: 0; font-size: 22px; }
.guide-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; padding: 18px 20px; }
.guide-grid section { background: var(--bg); border-radius: 12px; padding: 12px 14px; }
.guide-grid h3 { margin: 0 0 6px; font-size: 16px; }
.guide-grid pre { margin: 0 0 8px; padding: 9px 11px; background: var(--screen); color: var(--screen-ink); border-radius: 8px; font: 13px/1.55 ui-monospace, Menlo, monospace; overflow: auto; }
.guide-grid p { margin: 0; font-size: 14px; }
.shortcut-list { display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center; padding: 4px 20px 18px; font-size: 14px; }
.shortcut-list h3 { margin: 0; font-size: 14px; width: 100%; }

.toast { position: fixed; left: 50%; bottom: 22px; transform: translateX(-50%); z-index: 20; display: flex; align-items: center; gap: 14px; max-width: min(540px, calc(100vw - 24px)); padding: 11px 16px; background: var(--ink); color: var(--card); border-radius: 12px; font-weight: 600; box-shadow: 0 4px 14px #0004; }
.toast button { color: #ffd37a; font-weight: 800; text-decoration: underline; text-underline-offset: 3px; white-space: nowrap; }
.drop-veil { position: fixed; inset: 0; z-index: 30; background: color-mix(in srgb, var(--accent) 25%, transparent); display: flex; align-items: center; justify-content: center; pointer-events: none; }
.drop-veil div { padding: 26px 40px; background: var(--card); border: 3px dashed var(--accent); border-radius: 20px; font-size: 22px; font-weight: 800; }

@media (max-width: 1180px) {
  .tool span { display: none; }
  .tool { padding: 8px 10px; }
  .learn { width: 330px; }
}
@media (max-width: 900px) {
  .learn { position: fixed; z-index: 10; top: 0; bottom: 0; left: 0; width: min(380px, 92vw); box-shadow: 0 0 0 100vmax #2b242066; }
  .workbench { flex-direction: column; overflow: auto; gap: 12px; }
  .editor { flex: none; height: 52vh; min-height: 280px; }
  .side { flex: none; height: auto; }
  .pane.output { flex: none; height: 240px; }
  .pane.problems { flex: none; height: 200px; }
  .mobile-examples { display: flex; }
  .brand .brand-name { display: none; }
  .topbar { gap: 4px; padding: 8px 10px; }
  .file-tools { padding-left: 4px; border-left: 0; margin-left: 0; }
  #file-name { width: 120px; }
  .run, .stop { height: 38px; padding: 0 14px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }
@media (forced-colors: active) {
  #code { color: CanvasText; -webkit-text-fill-color: CanvasText; }
  #highlight, .active-line { display: none; }
}

.run.nudge { animation: nudge .6s ease-in-out 4; }
@keyframes nudge { 50% { transform: scale(1.12); } }

@media (max-width: 900px) {
  .topbar { flex-wrap: wrap; row-gap: 6px; }
  .filebox { order: 10; flex: 1 1 100%; }
  #file-name { width: 100%; max-width: none; border-color: var(--line); }
}
@media (max-width: 640px) {
  .tool { padding: 8px 8px; }
}
@media (max-width: 460px) {
  #theme-toggle { display: none; }
  .brand { margin-right: 0; }
}

.lang { padding: 6px 8px; background: var(--card); border: 2px solid var(--line); border-radius: 9px; font-weight: 600; }
.lang:hover { border-color: var(--edge); }
@media (max-width: 460px) { .lang { padding: 6px 4px; } }

/* Lesson step blocks */
.block-title { font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin-top: 4px; }
.tutorial-code { display: flex; flex-direction: column; gap: 0; padding: 0; background: none; border-radius: 10px; overflow: hidden; border: 2px solid var(--edge); }
.code-row { background: var(--card); border-bottom: 1px solid var(--line); }
.code-row:last-child { border-bottom: 0; }
.code-row .src { margin: 0; padding: 6px 12px; background: var(--screen); color: var(--screen-ink); font: 14px/1.5 ui-monospace, "SF Mono", Menlo, monospace; white-space: pre; overflow-x: auto; }
.code-row .note { padding: 5px 12px 7px; font-size: 14px; color: var(--ink); background: var(--bg); line-height: 1.4; }
.code-row .note::before { content: "\21B3  "; color: var(--accent); font-weight: 800; }
.see-box { display: flex; flex-direction: column; gap: 6px; }
.see-box .block-title { margin-top: 0; }
.screen { margin: 0; padding: 10px 14px; background: var(--screen); color: var(--screen-ink); border-radius: 10px; font: 14px/1.55 ui-monospace, "SF Mono", Menlo, monospace; white-space: pre-wrap; border-left: 5px solid var(--go); }
.slip-box { margin: 0; padding: 10px 12px; background: var(--bg); border-radius: 10px; border-left: 5px solid var(--warn); }
.slip-box b { display: block; font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--warn); margin-bottom: 2px; }
.step-actions { flex-direction: column; align-items: stretch; }
.step-actions .btn { justify-content: center; }
.tutorial-text { margin: 0; }
.tutorial-code { font: 14px/1.5 var(--ui); white-space: normal; overflow: hidden; }
.code-row .note { white-space: normal; overflow-wrap: anywhere; font-family: var(--ui); }
.code-row .note::before { font-family: var(--ui); }

/* The lesson list opens with where you are and what to do next. */
.lesson-summary { margin-bottom: 12px; padding: 12px; border: 2px solid var(--line); border-radius: 12px; background: var(--bg); }
.lesson-summary .summary-text { font-weight: 600; }
.lesson-summary .meter { height: 8px; margin: 8px 0 10px; border-radius: 99px; background: var(--line); overflow: hidden; }
.lesson-summary .meter i { display: block; height: 100%; background: var(--go); border-radius: 99px; transition: width .3s; }
.lesson-summary .continue { width: 100%; height: auto; min-height: 38px; padding: 8px 14px; text-align: left; justify-content: flex-start; }
.lesson-summary.finished { border-color: var(--go); }
.lesson-summary .finish-title { display: block; font-size: 17px; }
.lesson-summary p { margin: 4px 0 10px; color: var(--muted); }
.start-lessons { margin-top: 12px; color: var(--ink, #2b2420); background: var(--card, #fffaf0); }

.brand-version { align-self: center; margin-left: 6px; font-size: 12px; font-weight: 700; color: var(--muted); }
@media (max-width: 460px) { .brand-version { margin-left: 4px; font-size: 11px; } }

/* A problem, its short explanation, and the button for the whole Python error. */
.problem-item { border-bottom: 1px solid var(--line); }
.problem-item .problem { border-bottom: 0; }
.full-toggle { margin: 0 12px 10px 12px; padding: 4px 10px; border: 1.5px solid var(--line); border-radius: 8px; background: var(--card); color: var(--ink); font-weight: 600; font-size: 13px; cursor: pointer; }
.full-toggle:hover { border-color: var(--edge); }
.full-error { margin: 0 12px 12px 12px; padding: 10px 12px; overflow: auto; max-height: 220px; border-radius: 8px; background: var(--screen, #2a2420); color: var(--screen-ink, #f4ecdc); font: 12.5px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; white-space: pre; }

.lesson-group { margin: 16px 2px 4px; font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.lesson-group:first-of-type { margin-top: 4px; }

.try-it { background: var(--go, #3f9b55); color: #fff; border-color: var(--edge); box-shadow: 0 3px 0 var(--edge); }
.try-it:hover:not(:disabled) { background: var(--go, #3f9b55); filter: brightness(1.06); }
.engine[data-state="loading"]::before { content: ""; display: inline-block; width: 8px; height: 8px; margin-right: 6px; border-radius: 50%; background: var(--accent); animation: pulse 1s ease-in-out infinite alternate; }
.engine[data-state="ready"]::before { content: ""; display: inline-block; width: 8px; height: 8px; margin-right: 6px; border-radius: 50%; background: var(--go, #3f9b55); }
@keyframes pulse { to { opacity: .25; } }

/* Themes of the desktop app (the website only has light and dark) */
:root[data-theme="midnight"] { color-scheme: dark; --bg:#0f1724; --card:#162033; --ink:#e6edf7; --muted:#9fb0c8; --line:#26354d; --edge:#4a5f82; --accent:#5aa9ff; --accent-soft:#16304f; --go:#3fb663; --go-ink:#07210f; --stop:#ef6a6a; --warn:#e9b350; --err:#ff8a85; --ok:#6fd18a; --screen:#0a101a; --active:#1c2a42; --tok-keyword:#ff8fb1; --tok-string:#8ed99f; --tok-number:#7cc4ff; --tok-comment:#7488a6; --tok-value:#c9a2f2; --tok-operator:#a5b4cc; }
:root[data-theme="forest"] { color-scheme: dark; --bg:#14201a; --card:#1b2a22; --ink:#e8f2e6; --muted:#9fb8a6; --line:#2c4234; --edge:#547060; --accent:#8fd16a; --accent-soft:#23402a; --go:#3fb663; --go-ink:#0b2412; --stop:#ef6a6a; --warn:#e9b350; --err:#ff8a85; --ok:#8fe0a0; --screen:#0d1511; --active:#243a2d; --tok-keyword:#f2a6c4; --tok-string:#a6e39a; --tok-number:#8fd0f0; --tok-comment:#7f9a88; --tok-value:#d0b3f2; --tok-operator:#b0c4b4; }
:root[data-theme="sunset"] { --bg:#fbeee8; --card:#fff8f4; --ink:#3a2330; --muted:#86667a; --line:#e6cbc4; --edge:#3a2330; --accent:#d6336c; --accent-soft:#fbd9e6; --go:#2f9e4f; --go-ink:#ffffff; --stop:#d23b3b; --warn:#a96a00; --err:#c52f2f; --ok:#26803f; --screen:#2e1d2b; --screen-ink:#fbeee8; --screen-muted:#b79aa9; --active:#f7dfe0; --tok-keyword:#c2255c; --tok-string:#2b7a3d; --tok-number:#1d5fb0; --tok-comment:#a08593; --tok-value:#7a3fb0; --tok-operator:#86667a; }
:root[data-theme="contrast"] { --bg:#ffffff; --card:#ffffff; --ink:#000000; --muted:#333333; --line:#7a7a7a; --edge:#000000; --accent:#b8400a; --accent-soft:#ffe7d6; --go:#1b7a36; --go-ink:#ffffff; --stop:#b91c1c; --warn:#7a4a00; --err:#a01212; --ok:#14602b; --screen:#000000; --screen-ink:#ffffff; --screen-muted:#cfcfcf; --active:#fff1c2; --tok-keyword:#a3004a; --tok-string:#0b5d1e; --tok-number:#0a3d91; --tok-comment:#4d4d4d; --tok-value:#5b1f99; --tok-operator:#222222; }

/* Only the desktop app has these */
.app-only { display: none !important; }
[data-desktop] .app-only { display: inline-flex !important; }
.pop { position: fixed; z-index: 30; background: var(--card); color: var(--ink); border: 2px solid var(--edge); border-radius: 14px; box-shadow: 0 6px 0 var(--edge), 0 12px 30px #0004; padding: 8px; }
.theme-menu { display: flex; flex-direction: column; min-width: 190px; }
.theme-menu button { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 9px; font-weight: 700; text-align: left; }
.theme-menu button:hover, .theme-menu button[aria-checked="true"] { background: var(--accent-soft); }
.theme-menu button[aria-checked="true"]::after { content: "✓"; margin-left: auto; color: var(--accent); }
.swatch { width: 26px; height: 26px; border-radius: 8px; border: 2px solid var(--edge); background: linear-gradient(135deg, var(--a) 55%, var(--b) 55%); flex-shrink: 0; }
.command-pop { left: 50%; top: 80px; transform: translateX(-50%); width: min(560px, calc(100vw - 24px)); padding: 18px 20px; }
.command-pop h3 { margin: 0 0 6px; font-size: 18px; }
.command-pop p { margin: 8px 0 4px; }
.command-pop pre { margin: 0; padding: 10px 12px; background: var(--screen); color: var(--screen-ink); border-radius: 10px; font: 14px/1.6 ui-monospace, "SF Mono", Menlo, Consolas, monospace; white-space: pre-wrap; word-break: break-all; user-select: all; }
.command-pop .pop-note { color: var(--muted); font-size: 13px; }
.pop-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 12px; }