/* C-Note Music Philly · Design D "Kinetic Swiss — rhythm as typography"
   style.css — tokens, base, grid, buttons, header, hero + metronome */

:root {
  --paper: #ffffff;
  --ink: #0a0a0a;
  --lime: #d4ff3a;
  --mute: #5f5f5f;
  --soft: #e6e6e6;
  --f: "Archivo", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --m: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --g: 16px;      /* page gutter */
  --gap: 12px;    /* column gap */
  --cols: 4;
  --hdr: 56px;
  --ease: cubic-bezier(.16, 1, .3, 1);
  --snap: cubic-bezier(.77, 0, .18, 1);
}
@media (min-width: 640px)  { :root { --g: 24px; --gap: 16px; --cols: 6; } }
@media (min-width: 1000px) { :root { --g: 32px; --gap: 20px; --cols: 12; --hdr: 64px; } }

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 400 17px/1.5 var(--f); font-stretch: 100%;
  overflow-x: hidden; overflow-x: clip;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
}
h1, h2, h3, p, ol, ul, dl, dd, figure, blockquote { margin: 0; }
ol, ul { list-style: none; padding: 0; }
a { color: inherit; }
b { font-weight: 750; }
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; }
main:focus { outline: none; }
::selection { background: var(--lime); color: var(--ink); }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; box-shadow: 0 0 0 6px var(--lime); }
section[id] { scroll-margin-top: var(--hdr); }

.sr-only {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.mono {
  font-family: var(--m); font-size: 11px; line-height: 1.45; font-weight: 500;
  letter-spacing: .04em; text-transform: uppercase;
}
.mono a[href^="mailto"] { text-transform: none; }
.skip {
  position: fixed; left: 8px; top: 8px; z-index: 200; padding: 12px 16px;
  background: var(--lime); color: var(--ink); font-weight: 700; text-decoration: none;
  transform: translateY(-160%); transition: transform .2s var(--ease);
}
.skip:focus { transform: none; }

/* ---------- the visible 12 / 6 / 4 column grid ---------- */
.wrap { padding-inline: var(--g); }
.grid { display: grid; grid-template-columns: repeat(var(--cols), minmax(0, 1fr)); column-gap: var(--gap); }
.cols { position: fixed; inset: 0; z-index: 40; pointer-events: none; }
.cols__in {
  height: 100%; display: grid; grid-template-columns: repeat(var(--cols), minmax(0, 1fr));
  column-gap: var(--gap); padding-inline: var(--g);
}
.cols i { border-inline: 1px solid rgba(128, 128, 128, .12); }
.cols i:nth-child(n+5) { display: none; }
@media (min-width: 640px)  { .cols i:nth-child(n+5) { display: block; } .cols i:nth-child(n+7) { display: none; } }
@media (min-width: 1000px) { .cols i:nth-child(n+7) { display: block; } }

/* ---------- buttons ---------- */
.btn {
  --bg: var(--paper); --fg: var(--ink); --fill: var(--ink); --hover: var(--paper);
  position: relative; isolation: isolate; overflow: hidden;
  display: inline-flex; align-items: center; justify-content: space-between; gap: 16px;
  min-height: 52px; padding: 0 20px; border: 1px solid var(--ink);
  background: var(--bg); color: var(--fg); text-decoration: none;
  font: 700 14px/1.1 var(--f); font-stretch: 100%; letter-spacing: .04em; text-transform: uppercase;
  transition: color .35s var(--ease);
}
.btn::before {
  content: ""; position: absolute; inset: 0; z-index: -1; background: var(--fill);
  transform: scaleY(0); transform-origin: 50% 100%; transition: transform .35s var(--ease);
}
.btn:hover { color: var(--hover); }
.btn:hover::before { transform: scaleY(1); }
.btn span[aria-hidden] { display: inline-block; transition: transform .35s var(--ease); }
.btn:hover span[aria-hidden] { transform: translateX(4px); }
.btn--lime { --bg: var(--lime); --hover: var(--lime); }
.btn--ink { --bg: var(--ink); --fg: var(--lime); --fill: var(--paper); --hover: var(--ink); }
.btn--sm { min-height: 38px; padding: 0 14px; font-size: 12px; gap: 10px; }
.inv .btn--lime { --fill: var(--paper); --hover: var(--ink); border-color: var(--lime); }
.inv .btn--line { --bg: transparent; --fg: var(--paper); --fill: var(--paper); --hover: var(--ink); border-color: var(--paper); }

/* ---------- header ---------- */
.hdr {
  position: sticky; top: 0; z-index: 50; height: var(--hdr);
  display: flex; align-items: center; gap: 16px; padding-inline: var(--g);
  background: var(--paper); border-bottom: 1px solid var(--ink);
}
.hdr__logo { display: flex; align-items: center; gap: 9px; margin-right: auto; text-decoration: none; }
.hdr__logo b {
  font-size: 26px; line-height: 1; font-weight: 900; font-stretch: 75%;
  letter-spacing: -.02em; text-transform: uppercase;
}
.hdr__logo .mono { font-size: 9.5px; line-height: 1.12; }
.hdr__nav ul { display: flex; gap: 2px; }
.hdr__nav a {
  display: flex; align-items: baseline; gap: 6px; padding: 8px 10px;
  font-size: 14px; font-weight: 650; text-decoration: none; transition: background .2s, color .2s;
}
.hdr__nav a .mono { font-size: 10px; color: var(--mute); transition: color .2s; }
.hdr__nav a:hover, .hdr__nav a[aria-current] { background: var(--ink); color: var(--paper); }
.hdr__nav a:hover .mono, .hdr__nav a[aria-current] .mono { color: var(--lime); }
.hdr__navcta { display: none; }
.hdr__tools { display: flex; align-items: center; gap: 8px; }
.chip {
  display: inline-flex; align-items: center; gap: 8px; height: 38px; padding: 0 12px;
  border: 1px solid var(--ink); background: var(--paper);
  font: 500 12px/1 var(--m); letter-spacing: .04em; text-transform: uppercase;
  font-variant-numeric: tabular-nums; transition: background .2s, color .2s;
}
.chip:hover { background: var(--ink); color: var(--paper); }
.chip[aria-pressed="true"] { background: var(--ink); color: var(--lime); }
.chip__u { color: var(--mute); }
.chip:hover .chip__u, .chip[aria-pressed="true"] .chip__u { color: inherit; }
.chip__dot { display: block; width: 10px; height: 10px; background: var(--ink); }
.chip:hover .chip__dot { background: var(--lime); }
.chip__dot.tick1 { background: var(--lime); box-shadow: 0 0 0 1px var(--ink); }
@media (prefers-reduced-motion: no-preference) {
  .chip__dot.tick { animation: tick .24s var(--ease); }
  .chip__dot.tick1 { animation: tick .32s var(--ease); }
}
@keyframes tick { from { transform: scale(1.8); } to { transform: scale(1); } }
.hdr__menu {
  display: none; height: 38px; padding: 0 14px; border: 1px solid var(--ink);
  background: var(--ink); color: var(--paper); font: 500 12px/1 var(--m);
  letter-spacing: .06em; text-transform: uppercase;
}

@media (max-width: 1099px) {
  .hdr__cta, .chip--snd { display: none; }
  .js .hdr__menu { display: inline-flex; align-items: center; }
  .js .hdr__nav {
    position: fixed; left: 0; right: 0; top: var(--hdr); bottom: 0; z-index: 49;
    padding: 20px var(--g) 40px; background: var(--paper); overflow-y: auto;
    visibility: hidden; opacity: 0; transform: translateY(-12px);
    transition: opacity .25s var(--ease), transform .4s var(--ease), visibility 0s linear .4s;
  }
  .js .hdr.is-open .hdr__nav {
    visibility: visible; opacity: 1; transform: none;
    transition: opacity .25s var(--ease), transform .4s var(--ease);
  }
  .js .hdr__nav ul { flex-direction: column; gap: 0; border-top: 1px solid var(--ink); }
  .js .hdr__nav li { border-bottom: 1px solid var(--ink); }
  .js .hdr__nav a {
    padding: 12px 0; font-size: clamp(34px, 9.5vw, 64px); line-height: 1; font-weight: 850;
    font-stretch: 78%; letter-spacing: -.02em; text-transform: uppercase; gap: 14px;
  }
  .js .hdr__nav a .mono { font-size: 11px; width: 26px; flex: none; }
  .js .hdr__navcta { display: block; }
  .js .hdr__navcta a { background: var(--lime); padding-inline: 10px; }
  html:not(.js) .hdr { flex-wrap: wrap; height: auto; padding-block: 10px; }
  html:not(.js) .hdr__nav ul { flex-wrap: wrap; }
}
@media (max-width: 380px) { .hdr__logo .mono { display: none; } }

/* ---------- hero ---------- */
.hero {
  position: relative; display: flex; flex-direction: column;
  min-height: calc(100vh - var(--hdr)); min-height: calc(100svh - var(--hdr));
  padding-bottom: var(--g); overflow-x: hidden; overflow-x: clip;
}
.hero__meta { padding-block: 12px; row-gap: 10px; border-bottom: 1px solid var(--ink); }
.hero__meta p { grid-column: span 2; font-size: 10.5px; }
.hero__meta .key { display: block; color: var(--mute); }
.hero__meta p:nth-child(n+3) { display: none; }
@media (min-width: 640px)  { .hero__meta p { grid-column: span 3; } .hero__meta p:nth-child(n+3) { display: block; } }

.hero__stage { flex: 1; align-content: end; row-gap: 28px; padding-top: clamp(28px, 6vh, 64px); }
.hero__title {
  grid-column: 1 / -1; --fs: clamp(76px, 24vw, 150px);
  font-size: var(--fs); line-height: .8; font-weight: 820; font-stretch: 88%;
  letter-spacing: -.035em; text-transform: uppercase; cursor: crosshair;
}
.hl { display: block; white-space: nowrap; }
.hl--in { padding-left: calc((100% + var(--gap)) / 4); }
.kl { display: inline-block; }
.kl.hit { background: var(--lime); }
.hero__foot { grid-column: 1 / -1; display: grid; gap: 22px; }
.hero__lede { font-size: clamp(17px, 1.45vw, 21px); line-height: 1.4; max-width: 34em; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 8px; }
.metro { grid-column: 1 / -1; }

@media (min-width: 640px) {
  .hero__title { --fs: clamp(110px, 19vw, 220px); }
  .hl--in { padding-left: calc((100% + var(--gap)) / 6 * 2); }
  .metro { grid-column: 2 / -1; }
}
@media (min-width: 1000px) {
  .hero__stage { grid-template-rows: 1fr auto; align-items: end; }
  .hero__title { grid-column: 1 / 9; grid-row: 1; --fs: min(15.5vw, 25vh); }
  .hl--in { padding-left: calc((100% + var(--gap)) / 8 * 2); }
  .hero__foot {
    grid-column: 1 / 9; grid-row: 2; grid-template-columns: repeat(8, minmax(0, 1fr));
    column-gap: var(--gap); align-items: end;
  }
  .hero__lede { grid-column: 1 / 6; }
  .hero__cta { grid-column: 6 / 9; flex-direction: column; }
  .hero__cta .btn { width: 100%; }
  .metro { grid-column: 9 / 13; grid-row: 1 / 3; align-self: end; }
}

/* ---------- metronome ---------- */
.metro { border: 1px solid var(--ink); background: var(--paper); }
.metro__top { display: flex; justify-content: space-between; gap: 12px; padding: 10px 12px; border-bottom: 1px solid var(--ink); }
.metro__top [data-run-state] { color: var(--mute); }
.metro__bpm {
  display: flex; align-items: baseline; gap: 10px; padding: 10px 12px 6px;
  font-size: clamp(84px, 8.6vw, 136px); line-height: .82; font-weight: 900; font-stretch: 72%;
  letter-spacing: -.04em; font-variant-numeric: tabular-nums;
}
.metro__bpm .mono { font-size: 12px; letter-spacing: .08em; }
.metro__beats { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--ink); }
.metro__beats li { padding: 8px 10px; border-right: 1px solid var(--ink); transition: background .08s linear, color .08s linear; }
.metro__beats li:last-child { border-right: 0; }
.metro__beats li.on { background: var(--ink); color: var(--paper); }
.metro__beats li:first-child.on { background: var(--lime); color: var(--ink); }
.metro__rail {
  position: relative; height: 34px; border-block: 1px solid var(--ink); overflow: hidden;
  background: repeating-linear-gradient(90deg, var(--ink) 0 1px, transparent 1px 12.5%) 0 100% / 100% 30% no-repeat;
}
.metro__head { position: absolute; left: 0; top: 0; bottom: 0; width: 8px; background: var(--ink); will-change: transform; }
.metro__head::after { content: ""; position: absolute; left: 2px; right: 2px; top: 4px; height: 6px; background: var(--lime); }
.metro__ctl { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.mb {
  min-height: 50px; padding: 0 8px; border: 0; border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink);
  background: var(--paper); font: 700 13px/1 var(--f); letter-spacing: .04em; text-transform: uppercase;
  transition: background .15s, color .15s;
}
.mb:nth-child(3), .mb:nth-child(5) { border-right: 0; }
.mb:first-child, .mb:nth-child(3) { font-size: 22px; font-weight: 500; }
.mb--tap { grid-column: span 2; background: var(--lime); }
.mb--wide { grid-column: span 2; }
.mb:hover { background: var(--ink); color: var(--paper); }
.mb[aria-pressed="true"] { background: var(--ink); color: var(--lime); }
.mb--tap.flash { background: var(--ink); color: var(--lime); transition: none; }
.mb:focus-visible { position: relative; z-index: 1; }
.metro__note { padding: 10px 12px; color: var(--mute); }

/* ---------- entrance + reveal motion (never hides content without JS) ---------- */
@media (prefers-reduced-motion: no-preference) {
  .js .hl { animation: rise 1.1s var(--ease) backwards; }
  .js .hl:nth-child(3) { animation-delay: .09s; }
  .js .hl:nth-child(4) { animation-delay: .18s; }
  .js .hero__meta p, .js .hero__foot, .js .metro { animation: fadeUp .9s var(--ease) .45s backwards; }
  .fx [data-reveal] {
    opacity: 0; transform: translateY(28px);
    transition: opacity .8s var(--ease), transform .9s var(--ease);
    transition-delay: calc(var(--d, 0) * 80ms);
  }
  .fx [data-reveal].is-in { opacity: 1; transform: none; }
}
@keyframes rise {
  from { transform: translateY(45%); clip-path: inset(0 0 100% 0); }
  to { transform: none; clip-path: inset(-30% -30% -30% -30%); }
}
@keyframes fadeUp { from { opacity: 0; transform: translateY(18px); } }
@media (prefers-reduced-motion: reduce) {
  .metro__head { display: none; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}