/* "Hear a chirp" (explore/chirp.html) */

.chirp-body { padding-bottom: clamp(32px, 5vw, 64px); }
.chirp-nojs { margin: 0; padding: 18px 22px; border: 1px solid var(--line); border-radius: 16px; color: var(--text-2); }

.chirp-toy { border-radius: 24px; padding: clamp(16px, 2.4vw, 26px); }

/* ---------- plot ---------- */
.chirp-plot {
  position: relative; border: 1px solid var(--line); border-radius: 18px; overflow: hidden;
  background: radial-gradient(70% 90% at 85% 0%, rgb(var(--violet-rgb) / .08), transparent 70%), rgb(var(--bg-rgb) / .45);
}
#chirpCanvas { display: block; width: 100%; height: clamp(250px, 32vw, 340px); }
.chirp-now {
  position: absolute; top: 9px; right: 14px; margin: 0; max-width: calc(100% - 140px);
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .02em; color: var(--text-2); text-align: right;
}
.chirp-toy.is-playing .chirp-now { color: var(--amber); }

/* ---------- controls ---------- */
.chirp-controls {
  display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: clamp(20px, 3.2vw, 40px);
  margin-top: clamp(18px, 2.4vw, 26px);
}
.chirp-label, .chirp-pitch legend {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--text-3);
}
.chirp-presets { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.chirp-presets .chirp-label { margin-right: 4px; }
.chirp-preset {
  padding: 6px 12px; border-radius: 999px; border: 1px solid var(--line-2); background: rgb(var(--surface-rgb) / .35);
  font-family: var(--font-mono); font-size: 12px; color: var(--text-2); cursor: pointer;
  transition: border-color .2s ease, background-color .2s ease, color .2s ease;
}
.chirp-preset:hover { border-color: rgb(var(--cyan-rgb) / .6); color: var(--text); }
.chirp-preset.is-active { border-color: var(--cyan); background: rgb(var(--cyan-rgb) / .12); color: var(--text); }
.chirp-preset:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }

.chirp-sliders { margin-top: 18px; }
.chirp-slider + .chirp-slider { margin-top: 14px; }
.chirp-slider-head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 6px; }
.chirp-slider-head label { font-family: var(--font-display); font-weight: 600; font-size: 1rem; letter-spacing: -.01em; }
.chirp-slider-head output { font-family: var(--font-mono); font-size: 14px; color: var(--cyan); }
.chirp-kind { margin-left: auto; font-family: var(--font-mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--text-3); }
.chirp-kind[data-kind="neutron"] { color: var(--violet); }
.chirp-kind[data-kind="mass-gap"] { color: var(--amber); }
.chirp-scale { display: flex; justify-content: space-between; margin: 4px 0 0; font-family: var(--font-mono); font-size: 10.5px; color: var(--text-3); }

/* range input */
.chirp-slider input[type="range"] {
  -webkit-appearance: none; appearance: none; width: 100%; height: 26px; margin: 0; background: transparent; cursor: pointer;
}
.chirp-slider input[type="range"]::-webkit-slider-runnable-track {
  height: 4px; border-radius: 999px; background: linear-gradient(90deg, rgb(var(--violet-rgb) / .55), rgb(var(--cyan-rgb) / .55));
}
.chirp-slider input[type="range"]::-moz-range-track {
  height: 4px; border-radius: 999px; background: linear-gradient(90deg, rgb(var(--violet-rgb) / .55), rgb(var(--cyan-rgb) / .55));
}
.chirp-slider input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none; width: 20px; height: 20px; margin-top: -8px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--cyan); box-shadow: 0 0 12px rgb(var(--cyan-rgb) / .6);
}
.chirp-slider input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%; background: var(--bg); border: 2px solid var(--cyan);
  box-shadow: 0 0 12px rgb(var(--cyan-rgb) / .6);
}
.chirp-slider input[type="range"]:focus-visible { outline: 2px solid var(--cyan); outline-offset: 4px; border-radius: 6px; }

.chirp-play-row { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 20px; margin-top: 20px; }
.chirp-play { min-width: 128px; justify-content: center; border: 0; cursor: pointer; }
.chirp-play svg { width: 16px; height: 16px; fill: currentColor; }
.chirp-play .i-stop { display: none; }
.chirp-toy.is-playing .chirp-play .i-play { display: none; }
.chirp-toy.is-playing .chirp-play .i-stop { display: block; }
.chirp-play:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }

.chirp-pitch { display: flex; align-items: center; gap: 6px; margin: 0; padding: 0; border: 0; }
.chirp-pitch legend { float: left; margin-right: 8px; padding: 0; }
.chirp-pitch label { position: relative; }
.chirp-pitch input { position: absolute; opacity: 0; pointer-events: none; }
.chirp-pitch span {
  display: inline-block; padding: 6px 11px; border-radius: 999px; border: 1px solid var(--line-2);
  font-family: var(--font-mono); font-size: 12px; color: var(--text-2); cursor: pointer;
  transition: border-color .2s ease, background-color .2s ease, color .2s ease;
}
.chirp-pitch input:checked + span { border-color: var(--violet); background: rgb(var(--violet-rgb) / .14); color: var(--text); }
.chirp-pitch input:focus-visible + span { outline: 2px solid var(--cyan); outline-offset: 2px; }
.chirp-hint { margin: 12px 0 0; font-size: .88rem; color: var(--text-3); max-width: 60ch; }

/* stats */
.chirp-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin: 0; border-radius: 16px; overflow: hidden; background: var(--line); border: 1px solid var(--line); }
.chirp-stats > div { padding: 11px 14px; background: rgb(var(--bg-rgb) / .72); }
.chirp-stats-wide { grid-column: 1 / -1; }
.chirp-stats > div[hidden] { display: none; }
.chirp-stats dt { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--text-3); }
.chirp-stats dd { margin: 4px 0 0; font-family: var(--font-display); font-weight: 600; font-size: 1.02rem; letter-spacing: -.01em; }
.chirp-note { margin: 14px 2px 0; font-size: .92rem; color: var(--text-2); min-height: 2.6em; }

/* ---------- explainer ---------- */
.chirp-explain { padding-top: clamp(48px, 6vw, 88px); }
.chirp-explain .section-head { margin-bottom: 26px; }
.chirp-cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.chirp-card { padding: 22px 22px 24px; border: 1px solid var(--line); border-radius: 18px; background: rgb(var(--surface-rgb) / .3); }
.chirp-card h3 { margin: 0 0 10px; font-family: var(--font-display); font-weight: 600; font-size: 1.15rem; letter-spacing: -.02em; }
.chirp-card p { margin: 0; color: var(--text-2); font-size: .96rem; }
.chirp-model { margin-top: 22px; border: 1px solid var(--line); border-radius: 16px; }
.chirp-model summary {
  cursor: pointer; padding: 15px 20px; list-style: none;
  font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .03em; color: var(--cyan);
}
.chirp-model summary::-webkit-details-marker { display: none; }
.chirp-model summary::before { content: "+ "; }
.chirp-model[open] summary::before { content: "− "; }
.chirp-model summary:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; border-radius: 16px; }
.chirp-model-body { padding: 0 20px 18px; }
.chirp-model-body p { margin: 0 0 10px; color: var(--text-2); font-size: .94rem; max-width: 80ch; }
.chirp-links { display: flex; flex-wrap: wrap; gap: 14px 28px; margin-top: 28px; }
.chirp-links .link-arrow { white-space: normal; }
.msun sub { font-size: .72em; vertical-align: -0.2em; margin-left: .04em; }

/* ---------- small screens ---------- */
@media (max-width: 900px) {
  .chirp-controls { grid-template-columns: minmax(0, 1fr); }
  .chirp-cards { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 520px) {
  .chirp-now { position: static; max-width: none; padding: 8px 12px 0; text-align: left; }
  .chirp-pitch legend { float: none; width: 100%; margin-bottom: 6px; }
  .chirp-pitch { flex-wrap: wrap; }
}