/* InstructFX2FX — DAFx26 demo. Terminal / brutalist-editorial. */
:root {
  /* UC Berkeley palette: Berkeley Blue + California Gold on a cool off-white */
  --paper:   oklch(0.967 0.004 250);
  --paper-2: oklch(0.948 0.005 250);
  --paper-3: oklch(0.925 0.006 250);
  --ink:     oklch(0.225 0.013 255);
  --ink-2:   oklch(0.335 0.013 255);
  --muted:   oklch(0.480 0.012 258);
  --faint:   oklch(0.605 0.011 260);
  --line:    oklch(0.225 0.013 255);
  --line-2:  oklch(0.805 0.008 255);
  --blue:    oklch(0.430 0.122 252);
  --blue-d:  oklch(0.345 0.100 252);
  --gold:    oklch(0.760 0.142 82);
  --wave:    oklch(0.745 0.013 255);
  --accent:  var(--blue);
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --maxw: 940px;
  --pad: 34px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--mono); font-size: 15px; line-height: 1.62; letter-spacing: -0.002em;
  -webkit-font-smoothing: antialiased; padding: 16px;
}
::selection { background: var(--blue); color: var(--paper); }
a { color: inherit; }

.frame { max-width: var(--maxw); margin: 0 auto; border: 1.5px solid var(--line); background: var(--paper); }
.pad { padding: 0 var(--pad); }

/* hard rules between sections */
hr.thick { border: 0; border-top: 1.5px solid var(--line); margin: 0; }

/* ---- top bar ---- */
.topbar { position: sticky; top: 0; z-index: 30; background: var(--paper); border-bottom: 1.5px solid var(--line); }
.bar { display: flex; align-items: center; gap: 20px; height: 46px; padding: 0 var(--pad); }
.brand { font-weight: 700; letter-spacing: 0.02em; text-decoration: none; font-size: 0.82rem; white-space: nowrap; }
.tnav { display: flex; gap: 18px; overflow-x: auto; scrollbar-width: none; -ms-overflow-style: none; margin-left: auto; }
.tnav::-webkit-scrollbar { display: none; }
.tnav a { text-decoration: none; font-size: 0.74rem; letter-spacing: 0.04em; color: var(--muted); white-space: nowrap; transition: color .15s; }
.tnav a b { color: var(--blue); font-weight: 600; margin-right: 3px; }
.tnav a:hover, .tnav a.on { color: var(--ink); }
.tmeta { font-size: 0.72rem; color: var(--faint); letter-spacing: 0.05em; white-space: nowrap; }

/* ---- hero ---- */
.hero { padding: 52px var(--pad) 40px; }
.prompt { color: var(--blue); font-size: 0.78rem; letter-spacing: 0.06em; margin: 0 0 24px; }
.prompt b { color: var(--blue); font-weight: 500; }
h1.title { font-size: clamp(2.7rem, 10vw, 5.4rem); font-weight: 800; letter-spacing: -0.045em; line-height: 0.92; margin: 0 0 18px; }
h1.title .r { color: var(--blue); }
h1.title .cur { color: var(--gold); font-weight: 400; animation: blink 1.05s steps(1) infinite; }
@keyframes blink { 0%,50% { opacity: 1 } 50.01%,100% { opacity: 0 } }
.subtitle { font-size: clamp(0.98rem, 2.2vw, 1.18rem); font-weight: 500; line-height: 1.35; color: var(--ink-2); margin: 0 0 32px; max-width: 44ch; }

.meta { border-top: 1.5px solid var(--line); border-bottom: 1.5px solid var(--line); padding: 16px 0; margin: 0 0 28px; }
.meta dl { display: grid; grid-template-columns: 7.5rem 1fr; gap: 4px 16px; margin: 0; }
.meta dt { color: var(--faint); font-size: 0.74rem; letter-spacing: 0.05em; }
.meta dd { margin: 0; font-size: 0.82rem; color: var(--ink-2); }
.meta dd .sep { color: var(--line-2); margin: 0 6px; }
.meta dd b { color: var(--ink); font-weight: 600; }

.btns { display: flex; gap: 12px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; font-size: 0.78rem; font-weight: 600; letter-spacing: 0.04em; padding: 10px 16px; border: 1.5px solid var(--line); color: var(--ink); background: var(--paper); transition: background .15s, color .15s; }
.btn:hover { background: var(--ink); color: var(--paper); }
.btn.red { background: var(--blue); border-color: var(--blue); color: var(--paper); }
.btn.red:hover { background: var(--ink); border-color: var(--ink); }
.btn svg { width: 15px; height: 15px; }

/* ---- section header ---- */
section { padding: 0; }
section[id] { scroll-margin-top: 50px; }
.shead { display: flex; align-items: baseline; gap: 16px; padding: 18px var(--pad); border-bottom: 1.5px solid var(--line); }
.snum { color: var(--blue); font-weight: 700; font-size: 0.82rem; }
.stitle { font-weight: 600; font-size: 0.82rem; letter-spacing: 0.06em; text-transform: uppercase; }
.smeta { margin-left: auto; color: var(--faint); font-size: 0.72rem; letter-spacing: 0.05em; white-space: nowrap; }
.sbody { padding: 26px var(--pad) 34px; }

/* prose */
p.body { font-size: 0.92rem; color: var(--ink-2); margin: 0 0 16px; max-width: 66ch; line-height: 1.7; }
p.body:last-child { margin-bottom: 0; }
.hl { background: var(--blue); color: var(--paper); padding: 0 5px; font-weight: 500; }
.hl-o { color: var(--blue); font-weight: 600; }
.kbd { background: var(--paper-3); border: 1px solid var(--line-2); padding: 0 5px; font-weight: 500; }
.lead { color: var(--blue); font-size: 0.78rem; letter-spacing: 0.05em; margin: 0 0 14px; }

/* ---- architecture diagram ---- */
.diagram { border: 1.5px solid var(--line); background: var(--paper-2); padding: 22px 20px; margin: 0 0 26px; }
.dg-state { display: flex; align-items: center; gap: 12px; border: 1.5px dashed var(--line-2); background: var(--paper); padding: 9px 13px; }
.dg-state .k { color: var(--blue); font-weight: 600; font-size: 0.72rem; letter-spacing: 0.06em; }
.dg-state .v { color: var(--ink-2); font-size: 0.76rem; }
.dg-state .p { margin-left: auto; color: var(--faint); font-size: 0.68rem; letter-spacing: 0.05em; text-transform: uppercase; }
.dg-io { display: flex; justify-content: space-around; color: var(--faint); font-size: 0.64rem; letter-spacing: 0.04em; padding: 6px 0 2px; }
.dg-io span:before { content: ""; }
.dg-pipe { display: flex; align-items: stretch; gap: 0; }
.node { flex: 1; border: 1.5px solid var(--line); background: var(--paper); padding: 11px 12px; display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.node .n-k { font-weight: 700; font-size: 0.74rem; letter-spacing: 0.02em; }
.node .n-k em { color: var(--blue); font-style: normal; }
.node small { color: var(--muted); font-size: 0.66rem; letter-spacing: 0.01em; }
.conn { flex: 0 0 26px; display: grid; place-items: center; color: var(--blue); font-weight: 700; }
.dg-down { text-align: center; color: var(--blue); font-weight: 700; padding: 8px 0 4px; }
.dg-sub { display: grid; grid-template-columns: 1fr 1fr; gap: 0; }
.sub { border: 1.5px solid var(--line); background: var(--paper); padding: 11px 12px; }
.sub + .sub { border-left: 0; }
.sub b { color: var(--blue); font-weight: 700; font-size: 0.7rem; }
.sub .s-k { font-weight: 700; font-size: 0.74rem; margin-left: 6px; }
.sub .s-v { color: var(--muted); font-size: 0.66rem; margin-top: 3px; }

/* mode list */
ol.modes { list-style: none; counter-reset: m; margin: 0; padding: 0; border-top: 1px solid var(--line-2); }
ol.modes li { counter-increment: m; display: grid; grid-template-columns: 2.4rem 1fr; gap: 14px; padding: 13px 0; border-bottom: 1px solid var(--line-2); align-items: baseline; }
ol.modes li::before { content: "[" counter(m, decimal-leading-zero) "]"; color: var(--blue); font-weight: 600; font-size: 0.72rem; }
ol.modes p { margin: 0; font-size: 0.84rem; color: var(--ink-2); }
ol.modes b { color: var(--ink); font-weight: 700; }

/* ---- figures ---- */
.fig-stack { display: grid; gap: 26px; }
figure { margin: 0; }
.fignum { color: var(--faint); font-size: 0.68rem; letter-spacing: 0.06em; text-transform: uppercase; margin: 0 0 9px; }
.fignum b { color: var(--blue); font-weight: 600; }
figure img { width: 100%; border: 1.5px solid var(--line); display: block; background: var(--paper); }
figcaption { font-size: 0.78rem; color: var(--muted); margin-top: 10px; max-width: 100%; line-height: 1.55; }
figcaption::before { content: "▴ "; color: var(--blue); font-weight: 600; }
figcaption b { color: var(--ink-2); font-weight: 600; }
.traj-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px 14px; }
.traj-cell { margin: 0; }
.traj-cell img { width: 100%; border: 1.5px solid var(--line); display: block; background: var(--paper); }
.traj-cell span { display: block; font-family: var(--mono); font-size: 0.7rem; color: var(--faint); letter-spacing: 0.04em; margin-top: 6px; }
.totop { position: fixed; right: 22px; bottom: 22px; z-index: 50; width: 40px; height: 40px; display: grid; place-items: center; border: 1.5px solid var(--line); background: var(--paper); color: var(--ink); font-family: var(--mono); font-size: 0.8rem; text-decoration: none; opacity: 0; pointer-events: none; transition: opacity 0.2s ease, color 0.15s, border-color 0.15s; }
.totop.show { opacity: 1; pointer-events: auto; }
.totop:hover { color: var(--blue); border-color: var(--blue); }

/* ---- stats ---- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); border: 1.5px solid var(--line); margin: 0 0 30px; }
.stat { padding: 14px 16px 16px; border-left: 1px solid var(--line-2); }
.stat:first-child { border-left: 0; }
.stat .sk { display: block; color: var(--faint); font-size: 0.66rem; letter-spacing: 0.04em; margin-bottom: 8px; }
.stat .sv { font-size: 1.9rem; font-weight: 700; letter-spacing: -0.03em; line-height: 1; }
.stat .sv .u, .stat .sv .arr { color: var(--blue); }
.stat .sv .u { font-size: 0.92rem; font-weight: 600; margin-left: 1px; }
.stat .sv .arr { margin: 0 2px; font-weight: 600; }

/* ---- listen ---- */
.loading { padding: 22px 0; color: var(--muted); font-size: 0.86rem; }
.ex-intro { color: var(--muted); font-size: 0.84rem; margin: 0 0 28px; max-width: 64ch; line-height: 1.6; }
.ex-intro b { color: var(--ink-2); font-weight: 600; }

.session + .session { border-top: 1.5px solid var(--line); margin-top: 36px; padding-top: 34px; }
.ses-top { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; }
.ses-id { color: var(--blue); font-weight: 700; font-size: 0.76rem; }
.ses-top h3 { margin: 0; font-size: 1.06rem; font-weight: 700; letter-spacing: -0.01em; }
.ses-meta { margin-left: auto; color: var(--faint); font-size: 0.7rem; letter-spacing: 0.04em; white-space: nowrap; }
.ses-blurb { color: var(--muted); font-size: 0.82rem; margin: 8px 0 18px; max-width: 66ch; line-height: 1.55; }

.dry { display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: center; border: 1.5px solid var(--line); background: var(--paper-2); padding: 13px 15px; }
.dry .dry-tag { color: var(--muted); font-size: 0.66rem; letter-spacing: 0.06em; text-transform: uppercase; white-space: nowrap; }

.thread { margin-top: 4px; }
.turn { position: relative; padding: 20px 0 20px 36px; }
.turn::before { content: ""; position: absolute; left: 11px; top: 30px; bottom: -20px; width: 1.5px; background: var(--line-2); }
.turn:last-child::before { display: none; }
.turn-node { position: absolute; left: 0; top: 16px; width: 24px; height: 24px; background: var(--paper); border: 1.5px solid var(--line); display: grid; place-items: center; font-size: 0.66rem; font-weight: 700; color: var(--blue); z-index: 1; }
.instruction { font-size: 0.96rem; font-weight: 600; line-height: 1.4; color: var(--ink); margin: 0 0 12px; }
.instruction::before { content: "› "; color: var(--blue); }

.turn-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.route { display: inline-flex; align-items: center; gap: 6px; font-size: 0.66rem; font-weight: 600; letter-spacing: 0.04em; padding: 3px 9px; border: 1.5px solid var(--line); color: var(--ink); text-transform: uppercase; }
.route i { width: 6px; height: 6px; background: var(--muted); }
.route.init i { background: var(--blue); }
.route.extend i { background: var(--ink); }
.route.reuse i { background: var(--blue); outline: 1px solid var(--blue); outline-offset: 1px; background: var(--paper); }
.chain { display: inline-flex; align-items: center; gap: 5px; flex-wrap: wrap; }
.fx { font-size: 0.7rem; padding: 2px 7px; border: 1px solid var(--line-2); color: var(--muted); text-transform: uppercase; letter-spacing: 0.02em; }
.fx.new { color: var(--blue); border-color: var(--blue); }
.fx .tag { color: var(--blue); margin-left: 4px; font-size: 0.86em; }
.chain .arrow { color: var(--line-2); }

/* waveform player */
.player { border: 1.5px solid var(--line); background: var(--paper-2); padding: 12px 14px; }
.pl-row { display: grid; grid-template-columns: 36px 1fr auto; gap: 13px; align-items: center; }
.pbtn { width: 36px; height: 36px; border: 1.5px solid var(--line); background: var(--paper); display: grid; place-items: center; cursor: pointer; color: var(--ink); transition: background .12s, color .12s; }
.pbtn:hover { background: var(--ink); color: var(--paper); }
.pbtn[aria-pressed="true"] { background: var(--blue); border-color: var(--blue); color: var(--paper); }
.pbtn svg { width: 14px; height: 14px; }
.wf-wrap { position: relative; height: 50px; }
canvas.wf { width: 100%; height: 100%; display: block; cursor: pointer; touch-action: none; }
.wf-load { position: absolute; inset: 0; display: grid; place-items: center; font-size: 0.62rem; letter-spacing: 0.06em; color: var(--faint); pointer-events: none; opacity: 0; transition: opacity .15s; }
.wf-load.on { opacity: 1; }
.ptime { font-size: 0.7rem; color: var(--muted); white-space: nowrap; font-variant-numeric: tabular-nums; }

.pl-controls { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 12px; }
.seg { display: inline-flex; border: 1.5px solid var(--line); }
.seg button { font-family: var(--mono); font-size: 0.66rem; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; color: var(--muted); background: var(--paper); border: 0; border-left: 1.5px solid var(--line); padding: 6px 11px; cursor: pointer; transition: background .12s, color .12s; }
.seg button:first-child { border-left: 0; }
.seg button:hover { color: var(--ink); }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }

.gd { flex: 1 1 270px; min-width: 220px; }
.gd-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 7px; }
.gd-label { color: var(--faint); font-size: 0.64rem; letter-spacing: 0.05em; text-transform: uppercase; }
.gd-now { color: var(--blue); font-size: 0.68rem; font-weight: 600; font-variant-numeric: tabular-nums; }
input[type=range].slider { -webkit-appearance: none; appearance: none; width: 100%; height: 2px; background: var(--line); border-radius: 0; outline: none; cursor: pointer; margin: 0; }
input[type=range].slider::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 13px; height: 13px; border-radius: 0; background: var(--blue); border: 2px solid var(--paper); box-shadow: 0 0 0 1.5px var(--blue); transition: transform .12s; }
input[type=range].slider::-webkit-slider-thumb:hover { transform: scale(1.18); }
input[type=range].slider::-moz-range-thumb { width: 11px; height: 11px; border-radius: 0; background: var(--blue); border: 2px solid var(--paper); cursor: pointer; }
.gd-axis { display: flex; justify-content: space-between; color: var(--faint); font-size: 0.58rem; margin-top: 6px; letter-spacing: 0.03em; text-transform: uppercase; }

/* cite + footer */
pre.bib { background: var(--paper-2); color: var(--ink-2); border: 1.5px solid var(--line); padding: 18px 20px; overflow-x: auto; font-family: var(--mono); font-size: 0.74rem; line-height: 1.65; margin: 0; }
.footer { padding: 22px var(--pad); border-top: 1.5px solid var(--line); display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap; color: var(--faint); font-size: 0.68rem; letter-spacing: 0.04em; }
.footer .r { color: var(--gold); }

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto; } h1.title .cur { opacity: 1; } }

@media (max-width: 720px) {
  :root { --pad: 18px; }
  body { padding: 8px; font-size: 14px; }
  .brand, .tmeta { display: none; }
  .tnav { margin-left: 0; }
  .meta dl { grid-template-columns: 1fr; gap: 1px 0; }
  .meta dt { margin-top: 8px; }
  .dg-pipe { flex-direction: column; }
  .conn { flex-basis: 22px; transform: rotate(90deg); }
  .dg-sub { grid-template-columns: 1fr; }
  .sub + .sub { border-left: 1.5px solid var(--line); border-top: 0; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(3) { border-left: 0; }
  .stat:nth-child(3), .stat:nth-child(4) { border-top: 1px solid var(--line-2); }
  .pl-row { grid-template-columns: 34px 1fr; grid-template-areas: "btn wave" "time time"; row-gap: 8px; }
  .pbtn { grid-area: btn; } .wf-wrap { grid-area: wave; } .ptime { grid-area: time; text-align: right; }
  .dry { grid-template-columns: 1fr; }
}