/* Dad's Music Player — site styles
   Palette taken off the disc itself: cool polycarbonate paper, ink, and the
   CD sheen spectrum used exactly once, under the hero. */

:root {
  --paper:      #E9EBEE;
  --paper-lift: #F3F5F7;
  --ink:        #14171C;
  --ink-soft:   #565C66;
  --ink-faint:  #8A9099;
  --disc:       #1B1E24;
  --edge:       #CFD4DA;

  --spectrum-1: #F0679C;
  --spectrum-2: #F5C86A;
  --spectrum-3: #6FD6C0;
  --spectrum-4: #7FA8F0;

  --measure: 62ch;
  --shell: 1000px;
  --radius: 10px;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "IBM Plex Sans", ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- Type ---------- */

h1, h2, h3 {
  font-family: Archivo, ui-sans-serif, -apple-system, sans-serif;
  font-weight: 800;
  letter-spacing: -0.028em;
  line-height: 1.06;
  margin: 0;
  text-wrap: balance;
}

h1 { font-size: clamp(2.5rem, 6.4vw, 4.1rem); }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.15rem); letter-spacing: -0.022em; }
h3 { font-size: 1.06rem; font-weight: 700; letter-spacing: -0.012em; }

p { margin: 0 0 1.1em; max-width: var(--measure); }
p:last-child { margin-bottom: 0; }

a { color: var(--ink); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--ink-soft); }

.eyebrow {
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.71rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 14px;
}

.lede {
  font-size: clamp(1.06rem, 2.1vw, 1.24rem);
  color: var(--ink-soft);
  max-width: 46ch;
}

.mono {
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.86em;
}

/* ---------- Header ---------- */

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 0 0;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-family: Archivo, sans-serif;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.015em;
  text-decoration: none;
}

.wordmark img { width: 28px; height: 28px; border-radius: 7px; display: block; }

.masthead nav {
  display: flex;
  gap: 22px;
  font-size: 0.87rem;
}

.masthead nav a { color: var(--ink-soft); text-decoration: none; }
.masthead nav a:hover { color: var(--ink); text-decoration: underline; }

/* ---------- Hero ---------- */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
  gap: 56px;
  align-items: center;
  padding: 82px 0 46px;
}

.hero-disc {
  width: 100%;
  max-width: 296px;
  height: auto;
  justify-self: end;
  border-radius: 24%;
  box-shadow: 0 24px 60px rgba(20, 23, 28, 0.24), 0 3px 10px rgba(20, 23, 28, 0.14);
}

/* The disc spins up once on load, the way a drive does, then rests. */
@media (prefers-reduced-motion: no-preference) {
  .hero-disc {
    animation: spin-up 2.6s cubic-bezier(0.16, 0.84, 0.28, 1) 0.15s both;
  }
}

@keyframes spin-up {
  from { transform: rotate(-186deg) scale(0.94); opacity: 0; }
  to   { transform: rotate(0deg) scale(1); opacity: 1; }
}

.hero h1 { margin-bottom: 18px; }

/* The one flash of colour on the page: the sheen off a CD-R. */
.spectrum {
  height: 3px;
  border: 0;
  margin: 0;
  border-radius: 2px;
  background: linear-gradient(
    90deg,
    var(--spectrum-3) 0%,
    var(--spectrum-4) 26%,
    var(--spectrum-1) 54%,
    var(--spectrum-2) 78%,
    var(--spectrum-3) 100%
  );
}

/* ---------- Buttons ---------- */

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 18px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--ink);
  color: var(--paper-lift);
  font-family: Archivo, sans-serif;
  font-weight: 700;
  font-size: 0.97rem;
  letter-spacing: -0.008em;
  padding: 14px 24px;
  border-radius: var(--radius);
  text-decoration: none;
  transition: transform 0.14s ease, background-color 0.14s ease;
}

.button:hover {
  background: #2A2F38;
  color: var(--paper-lift);
  transform: translateY(-1px);
}

.button:active { transform: translateY(0); }

.button svg { width: 17px; height: 17px; flex: none; }

.meta {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.78rem;
  color: var(--ink-faint);
  line-height: 1.5;
}

/* ---------- Sections ---------- */

section { padding: 60px 0; }
section > h2 { margin-bottom: 12px; }

.section-intro { color: var(--ink-soft); margin-bottom: 34px; }

.rule {
  border: 0;
  border-top: 1px solid var(--edge);
  margin: 0;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(232px, 1fr));
  gap: 28px 34px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.features h3 { margin-bottom: 6px; }

.features p {
  color: var(--ink-soft);
  font-size: 0.95rem;
  margin: 0;
  max-width: none;
}

/* ---------- Dark panel, echoing the app's own chrome ---------- */

.panel {
  background: var(--disc);
  color: #DDE1E7;
  border-radius: 16px;
  padding: 40px;
  margin-top: 8px;
}

.panel h2 { color: #F3F5F7; }
.panel p { color: #A9B0BA; }
.panel .eyebrow { color: #6E7783; }

.filecard {
  background: #101318;
  border: 1px solid #2A2F38;
  border-radius: 10px;
  padding: 18px 20px;
  margin-top: 24px;
  overflow-x: auto;
}

.filecard pre {
  margin: 0;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.79rem;
  line-height: 1.75;
  color: #B6BDC7;
  white-space: pre;
}

.filecard .c { color: #6E7783; }
.filecard .t { color: #7FA8F0; }

/* ---------- Long-form pages ---------- */

.doc { padding: 44px 0 20px; max-width: 70ch; }
.doc h1 { font-size: clamp(2rem, 4.6vw, 2.9rem); margin-bottom: 10px; }
.doc h2 { font-size: 1.28rem; margin: 40px 0 12px; }
.doc h3 { margin: 26px 0 8px; }
.doc ul { padding-left: 1.15em; margin: 0 0 1.1em; max-width: var(--measure); }
.doc li { margin-bottom: 0.5em; }
.doc .updated {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.78rem;
  color: var(--ink-faint);
  margin-bottom: 34px;
}

.callout {
  border-left: 3px solid var(--ink);
  background: var(--paper-lift);
  padding: 16px 20px;
  border-radius: 0 8px 8px 0;
  margin: 0 0 1.4em;
  max-width: var(--measure);
}

.callout p { margin: 0; font-size: 0.94rem; color: var(--ink-soft); }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--edge);
  margin-top: 40px;
  padding: 30px 0 46px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 14px 28px;
  font-size: 0.84rem;
  color: var(--ink-faint);
}

.site-footer nav { display: flex; gap: 20px; flex-wrap: wrap; }
.site-footer a { color: var(--ink-soft); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }

/* ---------- Accessibility ---------- */

:focus-visible {
  outline: 2.5px solid #7FA8F0;
  outline-offset: 3px;
  border-radius: 4px;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper-lift);
  padding: 12px 18px;
  border-radius: 0 0 8px 0;
  z-index: 10;
}

.skip:focus { left: 0; }

/* ---------- Responsive ---------- */

@media (max-width: 800px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 34px;
    padding: 48px 0 34px;
    text-align: left;
  }
  .hero-disc { justify-self: start; max-width: 172px; }
  .panel { padding: 30px 24px; }
  section { padding: 46px 0; }
}

@media (max-width: 520px) {
  body { font-size: 16px; }
  .shell { padding: 0 20px; }
  .button { width: 100%; justify-content: center; }
  .masthead { flex-direction: column; align-items: flex-start; gap: 12px; }
}