/* ============================================================
   OSCILLA · toy-shop Bauhaus: thick ink borders, hard offset
   shadows, four block colors, and a machine you can play.
   ============================================================ */
:root {
  --paper: #FAF6EE;
  --ink: #16130E;
  --ink-soft: rgba(22, 19, 14, 0.66);
  --tomato: #FF4B2E;
  --cobalt: #2F5BFF;
  --sun: #FFC53D;
  --mint: #35C58C;
  --wave: var(--cobalt);          /* follows the selected waveform */

  --font-display: 'Bricolage Grotesque', 'Arial Black', sans-serif;
  --font-body: 'Schibsted Grotesk', 'Helvetica Neue', sans-serif;
  --font-mono: 'Azeret Mono', 'SF Mono', monospace;

  --border: 3px solid var(--ink);
  --shadow: 7px 7px 0 var(--ink);
  --shadow-sm: 4px 4px 0 var(--ink);
  --pad: clamp(20px, 4.5vw, 64px);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
::selection { background: var(--sun); color: var(--ink); }
a { color: inherit; text-decoration: none; }
:focus-visible { outline: 3px solid var(--cobalt); outline-offset: 3px; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

/* ---- header ---- */
.head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 20px var(--pad);
  border-bottom: var(--border);
  background: var(--paper);
}
.wordmark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}
.wordmark-dot {
  width: 12px; height: 12px;
  background: var(--wave);
  border: 2.5px solid var(--ink);
  border-radius: 50%;
  transition: background-color 0.25s ease;
}
.tagline {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.guide-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  font-weight: 600;
  padding: 10px 18px;
  border: var(--border);
  box-shadow: var(--shadow-sm);
  background: var(--sun);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.guide-link:hover { transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--ink); }

/* ---- hero ---- */
.hero { padding: clamp(40px, 7vh, 80px) var(--pad) 56px; max-width: 1240px; margin: 0 auto; }
.hero-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(4rem, 12vw, 9.5rem);
  line-height: 0.88;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}
.title-punct { color: var(--wave); transition: color 0.25s ease; }
.hero-sub {
  margin-top: 1.8rem;
  font-size: 1.125rem;
  max-width: 54ch;
  color: var(--ink-soft);
}
.hero-sub strong { color: var(--ink); }

/* ---- console ---- */
.console {
  margin-top: 3rem;
  border: var(--border);
  box-shadow: var(--shadow);
  background: #FFFDF7;
  padding: clamp(16px, 2.6vw, 30px);
  transform-origin: 50% 100%;
}
.console-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}
.console-brand {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
}
.console-power {
  width: 12px; height: 12px;
  border-radius: 50%;
  border: 2.5px solid var(--ink);
  background: #D8D2C4;
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}
.console-power.on { background: var(--mint); box-shadow: 0 0 10px var(--mint); }

#scope {
  display: block;
  width: 100%;
  height: clamp(140px, 22vh, 220px);
  border: var(--border);
  background: var(--ink);
}

/* ---- controls ---- */
.controls {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: clamp(14px, 2vw, 26px);
  align-items: stretch;
  margin-top: 18px;
}
fieldset { border: none; }
legend, .slider-name {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 8px;
  display: block;
}
.wave-picker, .octave { display: flex; flex-direction: column; }
.wave-picker > div, .octave > div { display: flex; }
.wave-btn, .oct-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 10px 14px;
  border: var(--border);
  margin-right: -3px;
  background: #FFFDF7;
  transition: background-color 0.12s ease;
}
.wave-btn.active { background: var(--wc, var(--sun)); }
.oct-btn.active { background: var(--sun); }
.wave-btn:hover:not(.active), .oct-btn:hover:not(.active) { background: #F0EADB; }

.sliders {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(12px, 1.8vw, 22px);
}
.slider { display: flex; flex-direction: column; }
.slider-val {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  margin-top: 6px;
  color: var(--ink);
}
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  min-width: 0;
  height: 26px;
  background: transparent;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 10px;
  background: var(--paper);
  border: var(--border);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px; height: 22px;
  margin-top: -9px;
  background: var(--wave);
  border: var(--border);
  box-shadow: 2px 2px 0 var(--ink);
  transition: background-color 0.25s ease;
}
input[type="range"]::-moz-range-track {
  height: 10px;
  background: var(--paper);
  border: var(--border);
}
input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px;
  background: var(--wave);
  border: var(--border);
  border-radius: 0;
  box-shadow: 2px 2px 0 var(--ink);
}

/* ---- keyboard ---- */
.keyboard {
  position: relative;
  display: flex;
  margin-top: 20px;
  height: clamp(120px, 18vh, 170px);
  border: var(--border);
  background: #FFFDF7;
  overflow: hidden;
}
.key {
  flex: 1;
  position: relative;
  border-right: var(--border);
  background: #FFFDF7;
  transition: background-color 0.06s ease;
}
.key:last-child { border-right: none; }
.key.held { background: var(--wave); }
.key-label {
  position: absolute;
  bottom: 8px; left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--ink-soft);
  pointer-events: none;
}
.key.sharp {
  position: absolute;
  top: 0;
  width: 6.5%;
  height: 58%;
  background: var(--ink);
  border: var(--border);
  z-index: 2;
  transform: translateX(-50%);
}
.key.sharp.held { background: var(--wave); }
.key.sharp .key-label { color: rgba(250, 246, 238, 0.7); }

.key-hint {
  margin-top: 16px;
  font-size: 0.8125rem;
  color: var(--ink-soft);
}
.key-hint kbd {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  border: 2px solid var(--ink);
  box-shadow: 2px 2px 0 var(--ink);
  padding: 1px 6px;
  margin: 0 2px;
  background: #FFFDF7;
  display: inline-block;
}

/* ---- marquee ---- */
.marquee {
  border-top: var(--border);
  border-bottom: var(--border);
  background: var(--sun);
  overflow: hidden;
  padding: 12px 0;
}
.marquee-track {
  display: flex;
  white-space: nowrap;
  width: max-content;
  animation: marquee 26s linear infinite;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.06em;
}
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ---- features ---- */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(18px, 2.6vw, 32px);
  padding: clamp(48px, 8vh, 90px) var(--pad);
  max-width: 1240px;
  margin: 0 auto;
}
.feature {
  border: var(--border);
  box-shadow: var(--shadow);
  background: #FFFDF7;
  padding: clamp(20px, 2.6vw, 32px);
  position: relative;
}
.feature::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 10px;
  background: var(--fc);
  border-bottom: var(--border);
}
.feature-no {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
  display: block;
  margin-top: 14px;
}
.feature h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 1.9vw, 1.7rem);
  line-height: 1.1;
  margin-top: 10px;
}
.feature p {
  margin-top: 12px;
  font-size: 0.9375rem;
  color: var(--ink-soft);
}

/* ---- specs ---- */
.specs {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 var(--pad) clamp(48px, 8vh, 90px);
}
.specs-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  text-transform: uppercase;
  letter-spacing: -0.01em;
  margin-bottom: 22px;
}
.spec-table {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border: var(--border);
  box-shadow: var(--shadow);
  background: #FFFDF7;
}
.spec-table > div {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 20px;
  border-bottom: 2px solid var(--ink);
}
.spec-table > div:nth-last-child(-n+2) { border-bottom: none; }
.spec-table > div:nth-child(odd) { border-right: 2px solid var(--ink); }
.spec-table dt {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  align-self: center;
}
.spec-table dd { font-size: 0.9375rem; font-weight: 500; }

/* ---- footer ---- */
.foot {
  border-top: var(--border);
  background: var(--ink);
  color: var(--paper);
  padding: clamp(48px, 8vh, 90px) var(--pad);
  text-align: center;
}
.foot-big {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3rem, 9vw, 7rem);
  text-transform: uppercase;
  line-height: 0.9;
  letter-spacing: -0.02em;
}
.foot-note {
  margin: 1.6rem auto 0;
  max-width: 52ch;
  font-size: 0.9375rem;
  color: rgba(250, 246, 238, 0.66);
}
.foot-note strong { color: var(--paper); }
.foot .cta {
  display: inline-block;
  margin-top: 2rem;
  padding: 14px 30px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  background: var(--tomato);
  color: var(--ink);
  border: var(--border);
  box-shadow: 5px 5px 0 rgba(250, 246, 238, 0.9);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.foot .cta:hover { transform: translate(3px, 3px); box-shadow: 2px 2px 0 rgba(250, 246, 238, 0.9); }

/* ---- responsive ---- */
@media (max-width: 940px) {
  .features { grid-template-columns: 1fr; }
  .controls { grid-template-columns: 1fr; }
  .wave-picker > div, .octave > div { flex-wrap: wrap; }
  .spec-table { grid-template-columns: 1fr; }
  .spec-table > div:nth-child(odd) { border-right: none; }
  .spec-table > div:nth-last-child(-n+2) { border-bottom: 2px solid var(--ink); }
  .spec-table > div:last-child { border-bottom: none; }
  .key-hint { display: none; }
  .tagline { display: none; }
}

@media (max-width: 640px) {
  .sliders { grid-template-columns: 1fr; }
  .spec-table > div { grid-template-columns: 104px minmax(0, 1fr); }
}

/* ---- reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  .marquee-track { animation: none; }
  .guide-link, .foot .cta { transition: none; }
}