/* ============================================================
   Notespawn — engraver's atelier
   Warm ivory paper, deep ink, bronze accent; the score reads as
   a physical sheet on a desk. Display serif: Fraunces.
   ============================================================ */

:root {
  --paper: #f5f1e8;
  --panel: #fffdf7;
  --sheet: #ffffff;
  --ink: #211c14;
  --ink-soft: #3d362a;
  --muted: #7a7060;
  --line: #e3dac7;
  --line-strong: #cfc3a9;
  --accent: #96551f;
  --accent-deep: #7a4217;
  --accent-ink: #b06a2e;
  --ok: #3d6b4f;
  --warn: #92600f;
  --err: #a33a2a;
  --mast: #191510;
  --mast-ink: #f2ead9;
  --shadow: 0 1px 2px rgba(33, 28, 20, .06), 0 10px 30px rgba(33, 28, 20, .09);
  --shadow-sheet: 0 1px 3px rgba(33, 28, 20, .10), 0 14px 40px rgba(33, 28, 20, .12);
  --radius: 12px;
  --serif: "Fraunces", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #171310;
    --panel: #201b15;
    --ink: #ece4d3;
    --ink-soft: #d8cdb6;
    --muted: #9b8f7a;
    --line: #373025;
    --line-strong: #4a4133;
    --accent: #c98a45;
    --accent-deep: #b06a2e;
    --accent-ink: #c98a45;
    --ok: #7fb08f;
    --warn: #d0a04a;
    --err: #d07a63;
    --mast: #100d0a;
    --mast-ink: #f2ead9;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px rgba(0, 0, 0, .35);
    --shadow-sheet: 0 1px 3px rgba(0, 0, 0, .4), 0 14px 40px rgba(0, 0, 0, .45);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Masthead: dark band with engraved staff lines ---------- */
.topbar {
  position: relative;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 1rem 1.4rem;
  background: var(--mast);
  color: var(--mast-ink);
  overflow: hidden;
}
.topbar::before {
  /* five faint staff lines drifting across the masthead */
  content: "";
  position: absolute; inset: 0;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0 14px,
    rgba(242, 234, 217, .07) 14px 15px
  );
  background-position: 0 6px;
  pointer-events: none;
}
.topbar::after {
  /* a large engraved clef ghosted into the right of the band */
  content: "𝄞";
  position: absolute; right: 1.2rem; top: 50%;
  transform: translateY(-52%);
  font-size: 4.6rem; line-height: 1;
  color: rgba(242, 234, 217, .10);
  font-family: var(--serif);
  pointer-events: none;
}
.brand { display: flex; align-items: center; gap: .9rem; position: relative; }
.brand-icon {
  width: 44px; height: 44px; border-radius: 10px;
  background: rgba(242, 234, 217, .08);
  border: 1px solid rgba(242, 234, 217, .18);
  padding: 3px;
}
.topbar h1 {
  font-family: var(--serif);
  font-size: 1.5rem; margin: 0; font-weight: 600;
  letter-spacing: .01em;
}
.tagline {
  margin: .05rem 0 0; font-size: .78rem;
  color: rgba(242, 234, 217, .62);
  letter-spacing: .14em; text-transform: uppercase;
}

/* ---------- Layout ---------- */
.layout {
  display: grid; grid-template-columns: 336px 1fr; gap: 1.4rem;
  padding: 1.4rem; max-width: 1400px; margin: 0 auto;
}
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.controls { padding: 1.25rem 1.2rem 1.1rem; position: sticky; top: 1rem; align-self: start; }
.stage { padding: 1.1rem 1.2rem 1.3rem; display: flex; flex-direction: column; }

/* ---------- Fields ---------- */
.field { margin-bottom: 1.05rem; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; }
label {
  display: block; font-weight: 600; font-size: .8rem;
  letter-spacing: .04em; margin-bottom: .35rem; color: var(--ink-soft);
}
.hint { color: var(--muted); font-size: .75rem; margin-top: .3rem; }
.hint.inline { font-weight: 400; letter-spacing: 0; }

select, input[type="number"] {
  width: 100%; padding: .55rem .65rem;
  border: 1px solid var(--line-strong);
  border-radius: 8px; font-size: .92rem;
  background: var(--panel); color: var(--ink);
  transition: border-color .15s ease, box-shadow .15s ease;
}
select:focus-visible, input[type="number"]:focus-visible {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent);
}
select {
  appearance: none; -webkit-appearance: none; -moz-appearance: none;
  cursor: pointer; padding-right: 2rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%2396551f' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right .65rem center;
}
select:hover { border-color: var(--accent); }

/* Difficulty slider */
input[type="range"] {
  width: 100%; accent-color: var(--accent);
  height: 1.2rem; cursor: pointer;
}
.pill {
  display: inline-block; min-width: 1.7rem; text-align: center;
  background: var(--accent); color: #fdf8ef; border-radius: 999px;
  padding: .08rem .55rem; font-size: .78rem; font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.seedrow { display: flex; gap: .5rem; }
.seedrow input { flex: 1; }
input:disabled, button:disabled.ghost { opacity: .45; }
.check {
  display: flex; align-items: center; gap: .55rem; font-weight: 600;
  font-size: .88rem; margin-bottom: .9rem; cursor: pointer; user-select: none;
  color: var(--ink-soft);
}
.check input { width: 1.05rem; height: 1.05rem; accent-color: var(--accent); }

details.advanced { border-top: 1px solid var(--line); padding-top: .7rem; margin-bottom: 1.1rem; }
details.advanced summary {
  cursor: pointer; font-weight: 600; font-size: .8rem;
  letter-spacing: .06em; text-transform: uppercase;
  color: var(--accent-ink);
}
details.advanced summary:hover { color: var(--accent-deep); }
details.advanced[open] summary { margin-bottom: .9rem; }

/* ---------- Buttons ---------- */
button {
  font: inherit; cursor: pointer; border-radius: 9px; border: 1px solid transparent;
  transition: background .15s ease, border-color .15s ease, color .15s ease,
              box-shadow .2s ease, transform .15s ease;
}
.primary {
  width: 100%; padding: .8rem;
  background: linear-gradient(to bottom, var(--accent), var(--accent-deep));
  color: #fdf8ef;
  font-weight: 700; font-size: .98rem; letter-spacing: .05em;
  box-shadow: var(--shadow);
  border: 1px solid var(--accent-deep);
}
.primary:hover:not(:disabled) {
  box-shadow: 0 2px 6px rgba(33, 28, 20, .18), 0 12px 32px rgba(33, 28, 20, .14);
  transform: translateY(-1px);
}
.primary:active:not(:disabled) { transform: translateY(0); }
.primary:disabled { opacity: .6; cursor: progress; }
.ghost {
  background: rgba(242, 234, 217, .07); color: inherit;
  border: 1px solid rgba(242, 234, 217, .35); padding: .45rem .8rem;
  font-size: .85rem;
}
.ghost:hover { background: rgba(242, 234, 217, .16); }
.tool {
  background: var(--panel); border: 1px solid var(--line-strong);
  padding: .5rem .75rem;
  font-size: .84rem; font-weight: 600; color: var(--ink-soft);
}
.tool:hover:not(:disabled) {
  border-color: var(--accent); color: var(--accent-deep);
  transform: translateY(-1px);
}
.tool:disabled { opacity: .4; cursor: default; }

.status { margin-top: .75rem; font-size: .82rem; min-height: 1.2rem; }
.status.ok { color: var(--ok); }
.status.warn { color: var(--warn); }
.status.err { color: var(--err); }

/* ---------- Stage: toolbar, meta, the sheet ---------- */
.toolbar { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; margin-bottom: .7rem; }
.spacer { flex: 1; }
midi-player { width: 100%; max-width: 360px; --md-sys-color-primary: var(--accent); }
midi-visualizer { display: block; margin-bottom: .6rem; }
.meta {
  font-size: .82rem; color: var(--muted); margin-bottom: .75rem; min-height: 1rem;
  font-family: var(--serif); font-style: italic;
}
.meta b { color: var(--ink); font-style: normal; }

.score {
  overflow-x: auto;
  background: var(--sheet);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow-sheet);
  padding: .6rem;
  flex: 1;
  min-height: min(52vh, 480px);
}
.score svg { max-width: 100%; height: auto; }
.score > svg, .score > .placeholder {
  animation: sheet-in .35s ease both;
}
@keyframes sheet-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .score > svg, .score > .placeholder { animation: none; }
  button, select, input { transition: none !important; }
}

.placeholder { text-align: center; color: var(--muted); padding: 3.5rem 1rem; }
.placeholder p:first-child {
  font-family: var(--serif);
  font-size: 4rem; margin: 0; line-height: 1;
  color: var(--line-strong);
}

.foot {
  text-align: center; color: var(--muted); font-size: .76rem; padding: 1.1rem;
  font-family: var(--serif); font-style: italic; letter-spacing: .02em;
}

/* ---------- Mobile / embedded ---------- */
@media (max-width: 820px) {
  .layout { grid-template-columns: 1fr; padding: 1rem; gap: 1rem; }
  .controls { position: static; }
  .topbar { padding: .8rem 1rem; }
  .topbar h1 { font-size: 1.25rem; }
  .topbar::after { font-size: 3.4rem; right: .6rem; }
  .stage { min-height: auto; }
  .score { min-height: 0; }
}
@media (max-width: 480px) {
  .tagline { display: none; }
  .brand-icon { width: 38px; height: 38px; }
}

/* ---------- Print: only the score, plain paper ---------- */
@media print {
  .topbar, .controls, .toolbar, .foot, midi-player, midi-visualizer, .meta { display: none !important; }
  .layout { display: block; padding: 0; }
  .panel { border: none; }
  .stage { box-shadow: none; padding: 0; }
  .score { border: none; box-shadow: none; padding: 0; background: #fff; }
  body { background: #fff; }
}