/* Degrees of Light – Website (kimusik.raspi0.blog) */
@property --glow { syntax: '<number>'; inherits: true; initial-value: 0.14; }

:root {
  --bg: #eceef2;
  --panel: #ffffff;
  --panel-2: #f5f6f9;
  --ink: #1a1d29;
  --muted: #586074;
  --line: #d6dae3;
  --paper: #fcfcfb;
  --link: #2c4ea8;
  --m1: #3a4686; --m2: #2f6399; --m3: #1d7c73; --m4: #9a6708; --m5: #8c6a00;
  --g1: #4a56a6; --g2: #3f7fc2; --g3: #1f9e93; --g4: #d99612; --g5: #e7b300;
  --dark1: #2b2f45; --dark2: #454b64;
  --hot: #c2185b;
  --shadow: 0 1px 2px rgba(20, 24, 40, .06), 0 10px 30px rgba(20, 24, 40, .07);
  --serif: "Old Standard TT", "Century Schoolbook", Georgia, serif;
  --sans: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1017; --panel: #151a24; --panel-2: #1a2030; --ink: #e6e8ee; --muted: #9ba2b5; --line: #262d3b;
    --paper: #121620; --link: #9fb6ff;
    --m1: #a3adf5; --m2: #8dbcef; --m3: #62d2c4; --m4: #f2bd55; --m5: #ffdb7d;
    --g1: #8e9bff; --g2: #6fb3ff; --g3: #3fe0cd; --g4: #ffb938; --g5: #ffe27a;
    --dark1: #3a3f5c; --dark2: #58607e;
    --hot: #ff8fb8;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 12px 32px rgba(0, 0, 0, .35);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 64px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.62;
  -webkit-text-size-adjust: 100%;
}
body::before {
  content: "";
  position: absolute; inset: 0 0 auto 0; height: 560px; pointer-events: none; z-index: 0;
  background:
    radial-gradient(60% 90% at 12% -10%, color-mix(in oklab, var(--g1) 22%, transparent), transparent 70%),
    radial-gradient(50% 80% at 88% -20%, color-mix(in oklab, var(--g4) 20%, transparent), transparent 70%);
}
a { color: var(--link); text-underline-offset: .18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; border-radius: 4px; }
img, video, svg { max-width: 100%; }

.wrap { position: relative; z-index: 1; max-width: 1120px; margin-inline: auto; padding-inline: 20px; }
.prose { max-width: 44rem; }
.prose p { margin: 0 0 1em; }
.prose ul, .prose ol { margin: 0 0 1em; padding-left: 1.3em; }
.prose li { margin-bottom: .35em; }
.muted { color: var(--muted); }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }

/* ------------------------------------------------ top bar */
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in oklab, var(--bg) 86%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid color-mix(in oklab, var(--line) 70%, transparent);
}
.topbar .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 52px; }
.brand { font-family: var(--serif); font-size: 19px; color: var(--ink); text-decoration: none; white-space: nowrap; }
.brand em { font-style: italic; }
.nav { display: flex; gap: 4px 18px; flex-wrap: wrap; justify-content: flex-end; font-size: 14px; }
.nav a { color: var(--muted); text-decoration: none; padding: 4px 0; }
.nav a:hover { color: var(--ink); }

/* ------------------------------------------------ hero */
.hero { padding-block: 56px 28px; }
.eyebrow { margin: 0 0 12px; font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); font-weight: 500; }
h1 {
  margin: 0; font-family: var(--serif); font-weight: 400;
  font-size: clamp(46px, 9vw, 92px); line-height: .98; letter-spacing: -0.015em; text-wrap: balance;
}
h1 em { font-style: italic; }
.sub { margin: 10px 0 0; font-family: var(--serif); font-size: clamp(20px, 3vw, 26px); color: var(--muted); }
.lede { margin: 22px 0 0; font-size: 19px; max-width: 40rem; }
.facts { display: flex; flex-wrap: wrap; gap: 6px 22px; margin: 18px 0 0; padding: 0; list-style: none; font-family: var(--mono); font-size: 13px; color: var(--muted); }
.facts b { color: var(--ink); font-weight: 500; }

.ladder {
  margin: 30px 0 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 4px;
  list-style: none; padding: 0; max-width: 760px;
}
.ladder li a {
  display: block; text-decoration: none; color: var(--ink);
  padding: 10px 10px 9px; border-radius: 6px;
  background: color-mix(in oklab, var(--c) 18%, var(--panel));
  border-top: 4px solid var(--c);
}
.ladder li a:hover { background: color-mix(in oklab, var(--c) 30%, var(--panel)); }
.ladder b { display: block; font-family: var(--serif); font-weight: 400; font-size: 17px; line-height: 1.2; hyphens: auto; -webkit-hyphens: auto; overflow-wrap: anywhere; }
.ladder span { display: block; font-family: var(--mono); font-size: 12px; color: var(--muted); }
.c1 { --c: var(--g1); } .c2 { --c: var(--g2); } .c3 { --c: var(--g3); } .c4 { --c: var(--g4); } .c5 { --c: var(--g5); }
.ladder-cap { margin: 8px 0 0; font-size: 13px; color: var(--muted); }

.cta { display: flex; flex-wrap: wrap; gap: 10px; margin: 28px 0 0; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px; border-radius: 999px; font-size: 15px; font-weight: 500;
  text-decoration: none; border: 1px solid var(--line); background: var(--panel); color: var(--ink);
  cursor: pointer; font-family: var(--sans);
}
.btn:hover { border-color: color-mix(in oklab, var(--ink) 35%, var(--line)); }
.btn.primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn svg { width: 16px; height: 16px; fill: currentColor; flex: none; }

/* ------------------------------------------------ sections */
section { padding-block: 44px 8px; }
h2 {
  margin: 0 0 14px; font-family: var(--serif); font-weight: 400;
  font-size: clamp(30px, 4.4vw, 42px); line-height: 1.1; text-wrap: balance;
}
h3 { margin: 34px 0 10px; font-family: var(--serif); font-weight: 400; font-size: 25px; line-height: 1.2; text-wrap: balance; }
.kicker { margin: 0 0 6px; font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.divider { height: 1px; background: var(--line); margin-top: 36px; }

/* ------------------------------------------------ video */
.player {
  margin: 8px 0 0; background: #07090d; border-radius: 12px; overflow: hidden; box-shadow: var(--shadow);
  aspect-ratio: 16 / 9;
}
.player video { display: block; width: 100%; height: 100%; background: #07090d; }
.vmeta { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px 18px; margin: 10px 2px 0; font-size: 13px; color: var(--muted); }
.vmeta button { background: none; border: 0; padding: 0; color: var(--link); font: inherit; cursor: pointer; text-decoration: underline; text-underline-offset: .18em; }
.chapters { list-style: none; margin: 14px 0 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 6px; }
.chapters button {
  width: 100%; text-align: left; cursor: pointer; font: inherit; color: var(--ink);
  background: var(--panel); border: 1px solid var(--line); border-left: 4px solid var(--c);
  border-radius: 6px; padding: 7px 10px; line-height: 1.3;
}
.chapters button:hover { background: color-mix(in oklab, var(--c) 12%, var(--panel)); }
.chapters .t { font-family: var(--mono); font-size: 12px; color: var(--muted); display: block; }
.chapters .n { font-size: 14px; }

/* ------------------------------------------------ cards */
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 18px; margin-top: 8px; }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px; overflow: hidden;
  display: flex; flex-direction: column;
}
.card .body { padding: 18px 20px 20px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.card h3 { margin: 0; font-size: 23px; }
.card p { margin: 0; }
.card .btn { align-self: flex-start; margin-top: auto; }
.card .shot { display: block; width: 100%; height: auto; border-bottom: 1px solid var(--line); background: #fcfcfb; }
.downloads { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.downloads a {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 12px;
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; text-decoration: none; color: var(--ink);
  background: var(--panel-2);
}
.downloads a:hover { border-color: color-mix(in oklab, var(--ink) 35%, var(--line)); }
.downloads .ext { font-family: var(--mono); font-size: 12px; font-weight: 500; padding: 3px 7px; border-radius: 4px; background: var(--ink); color: var(--bg); }
.downloads .size { font-family: var(--mono); font-size: 12px; color: var(--muted); }
.downloads small { display: block; color: var(--muted); font-size: 13px; }

/* ------------------------------------------------ figures: notation */
figure { margin: 22px 0; }
.notation {
  background: var(--paper); color: var(--ink); border: 1px solid var(--line); border-radius: 10px;
  padding: 16px 18px 12px; overflow-x: auto;
}
.notation svg { display: block; height: auto; width: 100%; margin-inline: auto; }
figcaption { margin-top: 8px; font-size: 14px; color: var(--muted); }
figcaption b { color: var(--ink); font-weight: 600; }
.motifs { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 16px; margin: 18px 0; }
.motifs figure { margin: 0; }
.motifs figure.theme { grid-column: 1 / -1; }
.motifs figure.theme .notation svg { margin-inline: 0; }
.motifs .notation { border-top: 4px solid var(--c); }

/* ------------------------------------------------ mode explorer */
.explorer { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px; margin: 22px 0; box-shadow: var(--shadow); }
.modes { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 14px; }
.modes button {
  font: inherit; font-size: 14px; cursor: pointer; padding: 6px 12px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--panel-2); color: var(--ink);
}
.modes button .x { font-size: 11px; color: var(--muted); margin-left: 4px; }
.modes button[aria-pressed="true"] { background: var(--c, var(--ink)); border-color: var(--c, var(--ink)); color: #fff; }
.modes button[aria-pressed="true"] .x { color: rgba(255, 255, 255, .8); }
@media (prefers-color-scheme: dark) { .modes button[aria-pressed="true"], .modes button[aria-pressed="true"] .x { color: #0d1017; } }
.modes .d1 { --c: var(--dark1); } .modes .d2 { --c: var(--dark2); }
.kbd { width: 100%; height: auto; display: block; }
.kbd .w { fill: #fbfbfa; stroke: #9aa1b3; stroke-width: 1; }
.kbd .b { fill: #1f2230; }
.kbd .on.w { fill: color-mix(in oklab, var(--c, var(--g3)) 45%, #fff); }
.kbd .on.b { fill: color-mix(in oklab, var(--c, var(--g3)) 80%, #000); }
.kbd .lbl { font-family: var(--sans); font-size: 12px; fill: #1f2230; text-anchor: middle; pointer-events: none; }
.kbd .lbl.onb { fill: #fff; }
.kbd .new { fill: none; stroke: var(--hot); stroke-width: 3; }
.kbd .tonic { fill: var(--hot); }
.mode-info { display: grid; grid-template-columns: 1fr auto; gap: 6px 18px; align-items: start; margin-top: 12px; }
.mode-info h4 { margin: 0; font-family: var(--serif); font-weight: 400; font-size: 24px; }
.mode-info .notes { font-family: var(--mono); font-size: 15px; margin: 2px 0 0; }
.mode-info .formula { font-family: var(--mono); font-size: 13px; color: var(--muted); margin: 0; }
.mode-info p { margin: 6px 0 0; font-size: 15px; }
.mode-info .play { grid-row: 1 / span 3; grid-column: 2; }
@media (max-width: 560px) { .mode-info { grid-template-columns: 1fr; } .mode-info .play { grid-row: auto; grid-column: auto; justify-self: start; } }

table.steps { border-collapse: collapse; width: 100%; font-size: 15px; margin: 14px 0 18px; }
table.steps th, table.steps td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.steps th { font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
table.steps td:first-child { font-family: var(--serif); font-size: 17px; white-space: nowrap; }
table.steps .mono { white-space: nowrap; }
.tablewrap { overflow-x: auto; }

/* ------------------------------------------------ form timeline */
.timeline { display: flex; gap: 2px; height: 44px; margin: 18px 0 6px; border-radius: 8px; overflow: hidden; }
.timeline button {
  flex: var(--w) 1 0; min-width: 0; border: 0; cursor: pointer; padding: 0 6px; color: #fff; font: inherit;
  font-size: 12px; font-weight: 600; letter-spacing: .04em; text-align: left; white-space: nowrap; overflow: hidden; text-overflow: clip;
  background: var(--c);
}
@media (prefers-color-scheme: dark) { .timeline button { color: #0d1017; } }
.timeline button:hover { filter: brightness(1.08); }
.tl-axis { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 12px; color: var(--muted); }
.form-list { list-style: none; margin: 18px 0 0; padding: 0; display: grid; gap: 0; }
.form-list li { display: grid; grid-template-columns: 7.6rem 1fr; gap: 4px 18px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.form-list .when { font-family: var(--mono); font-size: 13px; color: var(--muted); line-height: 1.5; }
.form-list .when button { font: inherit; color: var(--link); background: none; border: 0; padding: 0; cursor: pointer; text-decoration: underline; text-underline-offset: .18em; }
.form-list .mode { font-family: var(--serif); font-size: 18px; color: var(--mc); display: block; }
.form-list p { margin: 2px 0 0; font-size: 16px; }
.form-list h4 { margin: 0; font-size: 16px; font-weight: 600; }
@media (max-width: 560px) { .form-list li { grid-template-columns: 1fr; } }

/* ------------------------------------------------ rhythm demos */
.demo { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; margin: 20px 0; }
.demo .controls { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; margin-bottom: 12px; font-size: 14px; }
.demo label { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; color: var(--muted); }
.demo input { accent-color: var(--g3); }
.demo .status { font-family: var(--mono); font-size: 13px; color: var(--muted); margin-left: auto; }
.cells { display: grid; gap: 3px; }
.cells .row { display: grid; gap: 3px; grid-template-columns: 5.2rem repeat(var(--n), 1fr); align-items: stretch; }
.cells .lab { font-size: 12px; color: var(--muted); align-self: center; line-height: 1.2; }
.cell {
  height: 34px; border-radius: 4px; background: var(--panel-2); border: 1px solid var(--line);
  display: grid; place-items: center; font-family: var(--mono); font-size: 11px; color: var(--muted);
  transition: background .12s ease, transform .12s ease;
}
.cell.bar { border-left: 3px solid var(--ink); }
.cell.acc { color: var(--ink); font-weight: 600; }
.cell.g0 { background: color-mix(in oklab, var(--g3) 22%, var(--panel)); }
.cell.g1 { background: color-mix(in oklab, var(--g2) 22%, var(--panel)); }
.cell.beat { background: color-mix(in oklab, var(--g4) 22%, var(--panel)); }
.cell.now { outline: 2px solid var(--hot); outline-offset: -2px; transform: translateY(-2px); }
.cell.hit { background: var(--hot); color: #fff; }
@media (max-width: 560px) { .cells { overflow-x: auto; padding-bottom: 4px; } .cells .row { grid-template-columns: 3.6rem repeat(var(--n), minmax(17px, 1fr)); min-width: max-content; } .cell { height: 30px; font-size: 10px; } }

/* ------------------------------------------------ misc */
.aside { border-left: 3px solid var(--g4); padding: 4px 0 4px 16px; margin: 20px 0; color: var(--ink); }
.aside p { margin: 0; }
.voice { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 22px 24px; margin: 18px 0; }
.voice .who { font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); font-weight: 600; margin: 0 0 8px; }
footer { margin-top: 56px; padding-block: 28px 44px; border-top: 1px solid var(--line); font-size: 14px; color: var(--muted); }
footer p { margin: 0 0 8px; max-width: 60rem; }

@media (max-width: 720px) {
  body { font-size: 16px; }
  .ladder { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .ladder b { font-size: 14px; }
  .ladder span { font-size: 10px; }
  .ladder li a { padding: 8px 6px 7px; }
  .nav { font-size: 13px; gap: 2px 12px; }
  .brand { font-size: 17px; }
}
@media (max-width: 520px) {
  .nav a.opt { display: none; }
  .nav { flex-wrap: nowrap; }
  .ladder b { font-size: 13px; }
  .ladder li a { padding: 7px 5px 6px; }
}
@media (prefers-reduced-motion: reduce) { .cell { transition: none; } }