/* PyTheory Playground — styled after kennethreitz.org (Tufte CSS: ET Book on paper). */

@font-face {
  font-family: "ET Book";
  src: url("https://cdn.jsdelivr.net/gh/edwardtufte/et-book@gh-pages/et-book/et-book-roman-line-figures/et-book-roman-line-figures.woff") format("woff");
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "ET Book";
  src: url("https://cdn.jsdelivr.net/gh/edwardtufte/et-book@gh-pages/et-book/et-book-display-italic-old-style-figures/et-book-display-italic-old-style-figures.woff") format("woff");
  font-weight: normal;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "ET Book";
  src: url("https://cdn.jsdelivr.net/gh/edwardtufte/et-book@gh-pages/et-book/et-book-bold-line-figures/et-book-bold-line-figures.woff") format("woff");
  font-weight: bold;
  font-style: normal;
  font-display: swap;
}

/* Dark mode by default — same palette as kennethreitz.org's dark theme. */
:root {
  --bg: #0d1117;
  --ink: #e5e5e5;
  --muted: #9aa0a6;
  --faint: #6e7681;
  --line: #30363d;
  --card: #11161d;
  --code-bg: #161b22;
  --accent: #ff7b72;
  --accent2: #d29922;
  --serif: "ET Book", Palatino, "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 1.05rem/1.6 var(--serif);
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--accent); color: var(--bg); }

* { scrollbar-width: thin; scrollbar-color: var(--line) transparent; }
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: var(--line); border-radius: 4px; }
::-webkit-scrollbar-track { background: transparent; }

button, select, input, .note-pill, a {
  transition: color 0.15s ease, background-color 0.15s ease,
              border-color 0.15s ease, opacity 0.15s ease;
}
button:active:not(:disabled) { transform: translateY(1px); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }
select:focus-visible, input:focus-visible { outline: none; border-color: var(--accent); }

header { padding: 3rem 2rem 0; max-width: 1000px; margin: 0 auto; }
h1 { margin: 0; font-size: 2.6rem; font-weight: 400; letter-spacing: 0; }
h1 span { font-style: italic; color: var(--accent); }
.tagline {
  color: var(--muted); margin: 0.5rem 0 2rem;
  font-style: italic; font-size: 1.15rem; max-width: 42rem;
}
.tagline a { color: inherit; }

a { color: var(--ink); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: var(--accent); }

/* tabs */
#tabs { display: flex; flex-wrap: wrap; gap: 1.25rem; align-items: baseline; border-bottom: 1px solid var(--line); padding-bottom: 0.6rem; }
#tabs button {
  background: none; border: none; padding: 0 0 2px; cursor: pointer;
  font: italic 1.05rem var(--serif); color: var(--muted);
  border-bottom: 1px solid transparent;
}
#tabs button:hover { color: var(--ink); }
#tabs button.active {
  color: var(--accent); font-style: normal;
  border-bottom-color: var(--accent);
}

main { max-width: 1000px; margin: 0 auto; padding: 1.75rem 2rem; }
.panel { display: none; }
.panel.active { display: block; animation: panel-in 0.18s ease-out; }
@keyframes panel-in {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: none; }
}

/* controls */
.controls {
  display: flex; flex-wrap: wrap; gap: 1.1rem; align-items: end;
  margin-bottom: 1.5rem;
}
.controls label {
  display: flex; flex-direction: column; gap: 0.3rem;
  font-size: 0.8rem; font-style: italic; color: var(--muted);
}
select, input[type="text"], input[type="number"] {
  background: var(--bg); color: var(--ink);
  border: 1px solid var(--line); border-radius: 3px;
  padding: 0.4rem 0.55rem; font: 0.95rem var(--serif);
}
select:focus, input:focus { outline: none; border-color: var(--faint); }
input[type="file"] { color: var(--muted); font: 0.9rem var(--serif); }
.controls label.check { flex-direction: row; align-items: center; font-size: 0.9rem; }
select.inline { margin-left: 0.75rem; font-size: 0.8rem; padding: 0.15rem 0.35rem; }

/* buttons */
button.play, button.secondary {
  background: none; border: 1px solid var(--accent); color: var(--accent);
  border-radius: 3px; padding: 0.45rem 1rem;
  font: 0.95rem var(--serif); cursor: pointer;
}
button.play:hover { background: var(--accent); color: var(--bg); }
button.secondary { border-color: var(--ink); color: var(--ink); }
button.secondary:hover { background: var(--ink); color: var(--bg); }
button:disabled { opacity: 0.45; cursor: wait; }

/* cards */
.results { display: flex; flex-wrap: wrap; gap: 1.25rem; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 6px;
  padding: 1.25rem 1.5rem; flex: 0 1 auto; min-width: 280px;
}
.card.wide { flex: 1 1 100%; }
/* cards stacked directly in a panel (Tools, Groove Lab) need their own rhythm */
.panel > .card { margin-bottom: 1.25rem; }
.card h3 { margin: 0 0 0.85rem; font-size: 1.2rem; font-weight: 400; }
.card h3 small {
  color: var(--faint); font-weight: 400;
  font-family: var(--mono); font-size: 0.7rem; margin-left: 0.6rem;
}
.card h4 {
  margin: 1.1rem 0 0.45rem; font-size: 0.95rem;
  font-weight: 400; font-style: italic; color: var(--muted);
}

pre {
  font-family: var(--mono); font-size: 0.82rem; line-height: 1.45;
  background: var(--code-bg); border: 1px solid var(--line); border-radius: 3px;
  padding: 0.9rem 1rem; overflow: auto; white-space: pre; margin: 0;
  max-height: 420px;
}

.tones { color: var(--muted); font-family: var(--mono); font-size: 0.85rem; }
.tones:empty { display: none; }
.error { color: var(--accent); font-style: italic; }
.error:empty { display: none; }
.hint { color: var(--faint); font-size: 0.85rem; font-style: italic; }
.hidden { display: none !important; }

/* chord diagram */
#chord-diagram { display: block; margin: 0 auto; }
.diag-nut { fill: var(--ink); }
.diag-fret { stroke: var(--line); }
.diag-string { stroke: var(--faint); }
.diag-dot { fill: var(--ink); }
.diag-open { stroke: var(--accent); }
.diag-mute { fill: var(--accent); }
.diag-out { fill: var(--accent2); }
.diag-label { fill: var(--muted); font-family: var(--mono); }
svg text { font-family: var(--mono); }

/* horizontal scale fretboard */
.diag-nut-line { stroke: var(--ink); }
.diag-inlay { fill: var(--line); }
.board-dot { fill: var(--ink); }
.board-dot.root { fill: var(--accent); }
.board-note { fill: var(--bg); font-weight: bold; }

.fret-nav { display: flex; align-items: center; justify-content: center; gap: 0.6rem; margin: 0.25rem 0; }
.fret-nav button {
  background: none; color: var(--muted); border: 1px solid var(--line);
  border-radius: 3px; width: 26px; height: 26px; cursor: pointer; font-size: 0.95rem; line-height: 1;
}
.fret-nav button:hover { color: var(--ink); border-color: var(--faint); }
.fret-nav span { font-family: var(--mono); color: var(--faint); font-size: 0.8rem; min-width: 3ch; text-align: center; }
.custom-note { color: var(--accent2); font-weight: 400; font-style: italic; font-size: 0.8rem; }

/* note pills */
.note-row { display: flex; flex-wrap: wrap; gap: 0.45rem; align-items: center; }
.note-pill {
  background: var(--bg); border: 1px solid var(--line); border-radius: 999px;
  padding: 0.25rem 0.8rem; font-family: var(--mono); font-size: 0.85rem;
  display: inline-flex; align-items: center; gap: 0.35rem;
}
.note-pill:hover { border-color: var(--faint); }
.note-pill.tonic { border-color: var(--accent); color: var(--accent); }
.note-pill small { color: var(--faint); }

/* piano */
#scale-piano { margin-top: 1.1rem; position: relative; height: 110px; }
.white-key, .black-key { position: absolute; border-radius: 0 0 3px 3px; border: 1px solid #000; }
.white-key { width: 36px; height: 110px; background: #e8e8e2; z-index: 1; }
.black-key { width: 22px; height: 66px; background: #16181f; border-color: var(--faint); z-index: 2; }
.white-key.lit { background: var(--accent); border-color: var(--accent); }
.black-key.lit { background: var(--accent); border-color: var(--accent); }

/* key table */
#key-table { border-collapse: collapse; width: 100%; font-family: var(--mono); }
#key-table th, #key-table td {
  border: 1px solid var(--line); padding: 0.5rem 0.4rem; text-align: center; font-size: 0.85rem;
}
#key-table th { color: var(--accent2); font-weight: 400; }

/* progression cards */
.prog-row { display: flex; flex-wrap: wrap; gap: 1.25rem; }
.prog-chord { text-align: center; }
.prog-chord .numeral { color: var(--accent2); font-family: var(--mono); font-size: 0.85rem; }
.prog-chord svg { display: block; }
.prog-chord .sym { font-weight: bold; margin: 0.2rem 0; }

/* subtabs */
.subtabs { display: flex; gap: 0.4rem; margin: 1rem 0 0.75rem; }
.subtabs button {
  background: none; border: 1px solid var(--line); color: var(--muted);
  border-radius: 3px; padding: 0.3rem 0.75rem; cursor: pointer; font: 0.85rem var(--serif);
}
.subtabs button:hover:not(.active) { color: var(--ink); border-color: var(--faint); }
.subtabs button.active { color: var(--accent); border-color: var(--accent); }

#midi-download, #midi-pdf { margin-top: 0.85rem; margin-right: 0.5rem; }

/* chord lab */
table.kv { font-family: var(--mono); font-size: 0.82rem; border-collapse: collapse; }
table.kv td { padding: 0.28rem 0.85rem 0.28rem 0; vertical-align: top; }
table.kv td:first-child { color: var(--muted); font-style: normal; }
.voicing-row { display: flex; align-items: center; gap: 0.6rem; margin: 0.4rem 0; }
.voicing-label { min-width: 11rem; }
button.mini-play {
  background: none; border: 1px solid var(--accent); color: var(--accent);
  border-radius: 50%; width: 24px; height: 24px; cursor: pointer; font-size: 0.6rem;
  flex: none; line-height: 1;
}
button.mini-play:hover { background: var(--accent); color: var(--bg); }
button.mini-play.wide-play {
  border-radius: 999px; width: auto; height: auto;
  padding: 0.15rem 0.7rem; font-size: 0.7rem; margin-left: 0.6rem; vertical-align: middle;
}

#sound-wrap {
  margin-left: auto; color: var(--faint); display: flex; align-items: baseline; gap: 0.4rem;
  font-size: 1rem;
}
#sound-wrap select { font-size: 0.85rem; padding: 0.2rem 0.4rem; }

/* circle of fifths */
#circle-fifths { display: block; margin: 0 auto; }
.circle-node { fill: var(--code-bg); stroke: var(--line); stroke-width: 1; }
.circle-node.active { fill: var(--accent); stroke: var(--accent); }
.circle-label { fill: var(--ink); font-family: var(--serif); }
.circle-label.active { fill: var(--bg); }
.circle-sig { fill: var(--faint); font-family: var(--mono); }
g:hover .circle-node:not(.active) { stroke: var(--accent); }

/* groove lab */
.mono-val { font-family: var(--mono); color: var(--accent2); margin-left: 0.3rem; }
input[type="range"] { accent-color: var(--accent); }

/* tuner */
.tuner-display { text-align: center; margin: 1rem 0 1.5rem; }
.tuner-note { font-size: 4.5rem; line-height: 1.1; font-family: var(--serif); }
.tuner-freq { color: var(--muted); font-family: var(--mono); font-size: 0.9rem; margin-bottom: 1.25rem; }
.tuner-gauge { max-width: 480px; margin: 0 auto; }
.tuner-scale {
  display: flex; justify-content: space-between;
  font-family: var(--mono); font-size: 0.75rem; color: var(--faint); margin-bottom: 0.3rem;
}
.tuner-track {
  position: relative; height: 14px;
  border: 1px solid var(--line); border-radius: 999px; background: var(--code-bg);
}
.tuner-center {
  position: absolute; left: 50%; top: -4px; bottom: -4px; width: 1px;
  background: var(--faint);
}
.tuner-needle {
  position: absolute; left: 50%; top: -6px; width: 4px; height: 26px;
  background: var(--accent); border-radius: 2px; transform: translateX(-50%);
  transition: left 0.08s linear, background 0.15s; /* readings arrive 20×/sec */
}
.tuner-needle.in-tune { background: #3fb950; }
.tuner-verdict { margin-top: 0.6rem; font-style: italic; color: var(--muted); min-height: 1.4em; }

/* about page */
.prose { max-width: 48rem; font-size: 1.2rem; }
.prose h3 { font-weight: 400; font-size: 1.5rem; margin: 1.75rem 0 0.6rem; }
.prose p, .prose li { line-height: 1.7; }
.prose ul { padding-left: 1.4rem; }
.prose li { margin: 0.45rem 0; }
.prose pre { margin: 0.75rem 0; }

footer {
  max-width: 1000px; margin: 0 auto; padding: 1.5rem 2rem 2.5rem;
  color: var(--muted); font-size: 0.9rem; font-style: italic;
  border-top: 1px solid var(--line);
}

/* alternative voicings */
.alt-voicing { cursor: pointer; border-radius: 6px; padding: 2px; transition: background 0.15s; }
.alt-voicing:hover { background: var(--code-bg); }
#gscale-board { display: block; width: 100%; height: auto; }

/* mobile */
#circle-fifths { max-width: 100%; height: auto; }
#key-table-wrap { overflow-x: auto; }
@media (max-width: 640px) {
  header, main, footer { padding-left: 1rem; padding-right: 1rem; }
  h1 { font-size: 2rem; }
}