/* Forge playground. Colors are tokens on :root, redefined for dark mode
   (system preference, or the toggle via [data-theme]). */

:root {
  --bg: #f7f8fb;
  --panel: #ffffff;
  --panel-2: #f0f2f7;
  --border: #d9dee8;
  --text: #1b2233;
  --muted: #5b6478;
  --accent: #d94e1a;       /* Forge orange, darkened for contrast on white */
  --accent-text: #ffffff;
  --focus: #2563eb;
  --error: #c62828;
  --warning: #9a6700;
  --error-bg: #fdecec;
  --warning-bg: #fff6dd;
  --code-bg: #ffffff;
  --gutter: #8a93a6;
  --selection: #cfe0ff;
  /* syntax */
  --t-comment: #6a737d;
  --t-str: #0b7a3e;
  --t-esc: #b35c00;
  --t-interp: #7a3db8;
  --t-num: #b35c00;
  --t-kw: #c2185b;
  --t-kw2: #d94e1a;
  --t-fn: #1d5fbf;
  --t-type: #00796b;
  --t-const: #b35c00;
  --t-mod: #00796b;
  --t-deco: #7a3db8;
  --t-op: #5b6478;
  --t-call: #1d5fbf;
  /* ANSI */
  --a-red: #c62828; --a-green: #2e7d32; --a-yellow: #9a6700; --a-blue: #1d5fbf;
  --a-magenta: #8e24aa; --a-cyan: #00838f; --a-white: #5b6478; --a-black: #1b2233;
  --mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #020c1b; --panel: #0a192f; --panel-2: #112240; --border: #1d3461;
    --text: #e6f1ff; --muted: #a8b2d1; --accent: #ff6b35; --accent-text: #0a192f;
    --focus: #64ffda; --error: #ff8a80; --warning: #ffd54f;
    --error-bg: #3a1620; --warning-bg: #3a3214; --code-bg: #0a192f; --gutter: #5d6b8a;
    --selection: #1d3461;
    --t-comment: #7f8bab; --t-str: #a5e3a1; --t-esc: #ffcb8b; --t-interp: #d7b4ff;
    --t-num: #ffcb8b; --t-kw: #ff8fb3; --t-kw2: #ff8c5a; --t-fn: #82b1ff; --t-type: #64ffda;
    --t-const: #ffcb8b; --t-mod: #64ffda; --t-deco: #d7b4ff; --t-op: #a8b2d1; --t-call: #82b1ff;
    --a-red: #ff8a80; --a-green: #a5e3a1; --a-yellow: #ffd54f; --a-blue: #82b1ff;
    --a-magenta: #ea80fc; --a-cyan: #84ffff; --a-white: #e6f1ff; --a-black: #8892b0;
  }
}
:root[data-theme="dark"] {
  --bg: #020c1b; --panel: #0a192f; --panel-2: #112240; --border: #1d3461;
  --text: #e6f1ff; --muted: #a8b2d1; --accent: #ff6b35; --accent-text: #0a192f;
  --focus: #64ffda; --error: #ff8a80; --warning: #ffd54f;
  --error-bg: #3a1620; --warning-bg: #3a3214; --code-bg: #0a192f; --gutter: #5d6b8a;
  --selection: #1d3461;
  --t-comment: #7f8bab; --t-str: #a5e3a1; --t-esc: #ffcb8b; --t-interp: #d7b4ff;
  --t-num: #ffcb8b; --t-kw: #ff8fb3; --t-kw2: #ff8c5a; --t-fn: #82b1ff; --t-type: #64ffda;
  --t-const: #ffcb8b; --t-mod: #64ffda; --t-deco: #d7b4ff; --t-op: #a8b2d1; --t-call: #82b1ff;
  --a-red: #ff8a80; --a-green: #a5e3a1; --a-yellow: #ffd54f; --a-blue: #82b1ff;
  --a-magenta: #ea80fc; --a-cyan: #84ffff; --a-white: #e6f1ff; --a-black: #8892b0;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 var(--sans);
  display: flex;
  flex-direction: column;
}
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
::selection { background: var(--selection); }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}
.skip { position: absolute; left: -999px; top: 8px; background: var(--panel); padding: 6px 10px; z-index: 10; }
.skip:focus { left: 8px; }

/* ---------------------------------------------------------------- topbar */
.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 8px 16px; background: var(--panel); border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; }
.brand-sub { color: var(--muted); font-weight: 500; }
.logo {
  display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 7px;
  background: #0a192f; color: #ff6b35; font: 800 17px/1 var(--sans);
}
.actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

button, select {
  font: inherit; font-size: 14px; color: var(--text); background: var(--panel-2);
  border: 1px solid var(--border); border-radius: 8px; padding: 6px 12px; min-height: 36px;
  cursor: pointer;
}
button:hover:not(:disabled), select:hover { border-color: var(--muted); }
button:disabled { opacity: .55; cursor: default; }
button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); font-weight: 600; }
button.primary:hover:not(:disabled) { filter: brightness(1.08); }
#run { min-width: 76px; }
#examples { max-width: 14rem; text-overflow: ellipsis; }
button.icon { padding: 6px 9px; display: inline-grid; place-items: center; }
button.link { background: none; border: none; color: var(--muted); text-decoration: underline; padding: 4px 6px; min-height: 0; }
button[aria-expanded="true"]#tour-toggle { border-color: var(--accent); color: var(--accent); }

/* ---------------------------------------------------------------- layout */
.layout {
  flex: 1; min-height: 0;
  display: grid; gap: 12px; padding: 12px 16px;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr);
  grid-template-areas: "editor output";
}
body.touring .layout {
  grid-template-columns: minmax(260px, .8fr) minmax(0, 1.25fr) minmax(0, 1fr);
  grid-template-areas: "tour editor output";
}
.tour { grid-area: tour; }
.editor-pane { grid-area: editor; }
.output-pane { grid-area: output; }
.pane, .tour {
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px;
  min-height: 0; display: flex; flex-direction: column; overflow: hidden;
}

/* ---------------------------------------------------------------- editor */
.editor-pane #editor { flex: 1; min-height: 240px; }
.editor {
  position: relative; display: flex; align-items: flex-start;
  overflow: auto; background: var(--code-bg);
  font: 14px/1.6 var(--mono); tab-size: 4;
}
.editor-gutter {
  position: sticky; left: 0; z-index: 2; flex: none;
  padding: 12px 10px 12px 12px; min-width: 3.2em; text-align: right;
  color: var(--gutter); background: var(--code-bg); user-select: none;
  border-right: 1px solid var(--border); min-height: 100%;
}
.editor-gutter .mark-error { color: var(--error); font-weight: 700; }
.editor-gutter .mark-warning { color: var(--warning); font-weight: 700; }
.editor-code { position: relative; flex: 1; min-width: 0; }
.editor-highlight, .editor-input {
  margin: 0; padding: 12px 16px 12px 12px; border: 0;
  font: inherit; letter-spacing: normal; white-space: pre; tab-size: 4;
  min-width: 100%; min-height: 100%;
}
.editor-highlight { color: var(--text); pointer-events: none; }
.editor-input {
  position: absolute; inset: 0 auto auto 0; resize: none; overflow: hidden;
  background: transparent; color: transparent; caret-color: var(--text);
  outline: none;
}
.editor:focus-within { box-shadow: inset 0 0 0 2px var(--focus); }
.editor-input::selection { background: var(--selection); color: transparent; }

.t-comment { color: var(--t-comment); font-style: italic; }
.t-str { color: var(--t-str); }
.t-esc { color: var(--t-esc); }
.t-interp { color: var(--t-interp); }
.t-num { color: var(--t-num); }
.t-kw { color: var(--t-kw); font-weight: 600; }
.t-kw2 { color: var(--t-kw2); font-weight: 600; }
.t-fn, .t-call { color: var(--t-fn); }
.t-type { color: var(--t-type); }
.t-const { color: var(--t-const); }
.t-mod { color: var(--t-mod); }
.t-deco { color: var(--t-deco); }
.t-op { color: var(--t-op); }
.mark-error { text-decoration: underline wavy var(--error); text-decoration-skip-ink: none; text-underline-offset: 3px; }
.mark-warning { text-decoration: underline wavy var(--warning); text-decoration-skip-ink: none; text-underline-offset: 3px; }

.hint { margin: 0; padding: 6px 12px; font-size: 12.5px; color: var(--muted); border-top: 1px solid var(--border); }
kbd { font: 11.5px var(--mono); border: 1px solid var(--border); border-bottom-width: 2px; border-radius: 4px; padding: 0 4px; background: var(--panel-2); }

/* ---------------------------------------------------------------- output */
.pane-head { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; padding: 8px 12px; border-bottom: 1px solid var(--border); }
.pane-head h2 { margin: 0; font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.status { font-size: 13px; color: var(--muted); }
.status.busy::before { content: ""; display: inline-block; width: 8px; height: 8px; margin-right: 6px; border-radius: 50%; background: var(--accent); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .25; } }
@media (prefers-reduced-motion: reduce) { .status.busy::before { animation: none; } }
.output {
  flex: 1.6; min-height: 120px; margin: 0; padding: 12px; overflow: auto;
  font: 13.5px/1.55 var(--mono); white-space: pre-wrap; word-break: break-word;
}
.output .stderr { color: var(--muted); }
.output .note { color: var(--muted); font-style: italic; }
.run-error { margin-top: 8px; padding: 10px 12px; border-radius: 8px; background: var(--error-bg); border-left: 4px solid var(--error); white-space: normal; }
.run-error.kind-limit, .run-error.kind-unsupported { background: var(--warning-bg); border-left-color: var(--warning); }
.run-error strong { color: var(--error); }
.run-error.kind-limit strong, .run-error.kind-unsupported strong { color: var(--warning); }
.run-error pre { margin: 6px 0 0; white-space: pre-wrap; font: inherit; font-family: var(--mono); }
.run-error .goto { min-height: 0; padding: 0 6px; font: 12.5px var(--mono); }

.problems { list-style: none; margin: 0; padding: 4px; flex: 1; min-height: 60px; overflow: auto; }
.problems .empty { color: var(--muted); padding: 6px 8px; font-size: 13.5px; }
.problem {
  display: grid; grid-template-columns: auto auto 1fr auto; gap: 8px; align-items: baseline;
  width: 100%; text-align: left; background: none; border: 1px solid transparent; border-radius: 6px;
  padding: 6px 8px; min-height: 0; font-size: 13.5px;
}
.problem:hover { background: var(--panel-2); }
.problem .sev { font-size: 11px; font-weight: 700; text-transform: uppercase; }
.problem.error .sev { color: var(--error); }
.problem.warning .sev { color: var(--warning); }
.problem .loc, .problem .code { font: 12px var(--mono); color: var(--muted); }
.problem .help { display: block; color: var(--muted); font-size: 12.5px; }

/* ANSI colors in program output */
.a-bold { font-weight: 700; } .a-dim { opacity: .7; } .a-italic { font-style: italic; } .a-underline { text-decoration: underline; }
.a-fg-red, .a-fg-bright-red { color: var(--a-red); } .a-fg-green, .a-fg-bright-green { color: var(--a-green); }
.a-fg-yellow, .a-fg-bright-yellow { color: var(--a-yellow); } .a-fg-blue, .a-fg-bright-blue { color: var(--a-blue); }
.a-fg-magenta, .a-fg-bright-magenta { color: var(--a-magenta); } .a-fg-cyan, .a-fg-bright-cyan { color: var(--a-cyan); }
.a-fg-white, .a-fg-bright-white { color: var(--a-white); } .a-fg-black, .a-fg-bright-black { color: var(--a-black); }
[class*="a-bg-"] { background: var(--panel-2); }

/* ------------------------------------------------------------------ tour */
.tour { padding: 14px 16px; overflow: auto; }
.tour-head { display: flex; justify-content: space-between; align-items: center; }
.tour-progress { font-size: 12.5px; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: .05em; }
.tour-meter { height: 4px; background: var(--panel-2); border-radius: 2px; margin: 8px 0 4px; }
#tour-bar { height: 100%; background: var(--accent); border-radius: 2px; width: 0; transition: width .2s; }
.tour h2 { font-size: 20px; margin: 10px 0 6px; outline: none; }
.tour-body { font-size: 15px; }
.tour-body code { font: 13px var(--mono); background: var(--panel-2); padding: 1px 5px; border-radius: 4px; }
.tour-done { color: var(--a-green); font-weight: 600; }
.tour-nav { margin-top: auto; padding-top: 12px; display: flex; justify-content: space-between; align-items: center; gap: 8px; }

.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%);
  background: var(--text); color: var(--bg); padding: 8px 16px; border-radius: 8px;
  font-size: 14px; box-shadow: 0 6px 24px rgba(0,0,0,.2); z-index: 20;
}

/* ---------------------------------------------------------------- mobile */
@media (max-width: 900px) {
  body { height: auto; }
  .layout, body.touring .layout {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto;
    grid-template-areas: "tour" "editor" "output";
    padding: 12px 16px;
  }
  .editor-pane #editor { min-height: 300px; max-height: 60vh; }
  .output { min-height: 160px; max-height: 50vh; }
  .problems { max-height: 30vh; }
  .topbar { position: sticky; top: 0; z-index: 5; }
  .actions { width: 100%; }
  .actions .select { flex: 1 1 8rem; min-width: 0; }
  .actions select { width: 100%; max-width: none; }
  #run { margin-left: auto; }
  .brand-sub { display: none; }
}