/* Instrument Dark — dark technical template.
   Accent-driven: every glow, wash, hairline and ring derives from --accent.
   Dark only by design; the contrast model depends on emitted light. */

:root {
  --accent: #00d4ff;
  --counter: #ff6b35;

  /* Surfaces cool as they rise; they do not simply lighten. */
  --surface-0: #030508;
  --surface-1: #0a0f1a;
  --surface-2: #0f1729;
  --surface-3: #1a2744;

  --text-hi: #f2f7ff;
  --text: #c3cede;
  --text-muted: #8494ab;
  --text-faint: #4a5a72;

  --ok: #3ddc97;

  --sans: Outfit, "Avenir Next", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", "Fira Code", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --track-label: .12em;
  --track-eyebrow: .2em;
  --track-kicker: .4em;

  --r-sm: .5rem;
  --r-md: .75rem;
  --r-lg: 1rem;

  --ease: cubic-bezier(.4, 0, .2, 1);
  --focus: var(--accent);

  /* Accent alpha ladder — the accent lives here, not at full strength. */
  --a-03: color-mix(in srgb, var(--accent) 3%, transparent);
  --a-08: color-mix(in srgb, var(--accent) 8%, transparent);
  --a-15: color-mix(in srgb, var(--accent) 15%, transparent);
  --a-30: color-mix(in srgb, var(--accent) 30%, transparent);
  --a-50: color-mix(in srgb, var(--accent) 50%, transparent);
  --accent-ink: #001018;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 6rem; }

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--surface-0);
  color: var(--text);
  font: 400 1rem/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button, select, textarea, input { color: inherit; font: inherit; }
button, select { cursor: pointer; }
img, svg { display: block; max-width: 100%; }

h1, h2, h3 { color: var(--text-hi); font-weight: 600; line-height: 1.1; letter-spacing: -.02em; margin: 0; }
h1 { font-size: clamp(2.75rem, 7vw, 5rem); font-weight: 700; }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.6rem); }
h3 { font-size: 1.15rem; }
p { margin: 0; }

::selection { background: var(--a-30); color: var(--text-hi); }

/* ---------- Accessibility baseline ---------- */
.skip-link {
  position: absolute;
  left: .75rem;
  top: -100%;
  z-index: 100;
  padding: .7rem 1rem;
  border-radius: var(--r-md);
  background: var(--accent);
  color: var(--accent-ink);
  font-family: var(--mono);
  font-size: .75rem;
  letter-spacing: var(--track-label);
  text-transform: uppercase;
  transition: top .15s var(--ease);
}
.skip-link:focus { top: .75rem; }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: 4px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Mono micro type: labels are instrument markings ---------- */
.label, .eyebrow, .kicker {
  font-family: var(--mono);
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0;
}
.label { font-size: .6875rem; letter-spacing: var(--track-label); font-weight: 500; }
.eyebrow { font-size: .75rem; letter-spacing: var(--track-eyebrow); color: var(--accent); font-weight: 500; }
.kicker { font-size: .6875rem; letter-spacing: var(--track-kicker); color: var(--text-faint); }

.t-gradient {
  background: linear-gradient(100deg, var(--accent), color-mix(in srgb, var(--accent) 55%, #ffffff));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1.25rem, 5vw, 4rem);
  background: color-mix(in srgb, var(--surface-0) 72%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid color-mix(in srgb, var(--surface-3) 60%, transparent);
}
.brand-name {
  font-family: var(--mono);
  font-weight: 600;
  letter-spacing: var(--track-label);
  color: var(--text-hi);
  font-size: .95rem;
}
.primary-nav { display: flex; gap: 1.75rem; }
.primary-nav a {
  font-family: var(--mono);
  font-size: .75rem;
  letter-spacing: var(--track-label);
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color .15s var(--ease);
}
.primary-nav a:hover { color: var(--accent); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: .5rem;
  padding: .55rem .8rem;
  background: transparent;
  border: 1px solid var(--surface-3);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: var(--track-label);
  text-transform: uppercase;
  color: var(--text);
}
.nav-toggle-lines { display: inline-flex; flex-direction: column; gap: 3px; }
.nav-toggle-lines i { width: 14px; height: 1.5px; background: currentColor; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  isolation: isolate;
  padding: clamp(4rem, 12vh, 8rem) clamp(1.25rem, 5vw, 4rem) clamp(3rem, 8vh, 5rem);
  overflow: hidden;
}
.ambient { position: absolute; inset: 0; z-index: -1; pointer-events: none; }
.bloom { position: absolute; border-radius: 50%; filter: blur(110px); opacity: .5; }
.bloom-one {
  width: 620px; height: 620px; top: -260px; left: 50%;
  transform: translateX(-50%);
  background: var(--a-30);
  animation: drift 18s var(--ease) infinite alternate;
}
.bloom-two {
  width: 380px; height: 380px; bottom: -200px; right: -120px;
  background: color-mix(in srgb, var(--counter) 16%, transparent);
}
/* Inline textures — no network requests. */
.texture-grid {
  position: absolute; inset: 0; opacity: .5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60'%3E%3Cpath d='M60 0H0v60' fill='none' stroke='%23ffffff' stroke-opacity='.03'/%3E%3C/svg%3E");
  mask-image: radial-gradient(70% 60% at 50% 30%, #000 40%, transparent 100%);
}
.texture-noise {
  position: absolute; inset: 0; opacity: .15; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.hero h1 { margin: 1rem 0 1.25rem; max-width: 18ch; }
.hero-intro { max-width: 54ch; font-size: 1.125rem; color: var(--text-muted); }
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }
.hero-note { margin-top: 1rem; font-size: .8125rem; color: var(--text-faint); max-width: 60ch; }

/* ---------- Readout: fixed mono label + live value ---------- */
.readout-bar { display: flex; flex-wrap: wrap; gap: .625rem; margin-top: 2.5rem; }
.readout {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .45rem .75rem;
  border: 1px solid color-mix(in srgb, var(--surface-3) 80%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface-1) 70%, transparent);
  font-family: var(--mono);
  font-size: .6875rem;
  letter-spacing: var(--track-label);
  text-transform: uppercase;
  color: var(--text-muted);
  white-space: nowrap;
}
.readout b { color: var(--accent); font-weight: 600; }
.readout-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}
.readout-dot-ok { background: var(--ok); box-shadow: 0 0 8px var(--ok); animation: pulse 2s var(--ease) infinite; }

/* ---------- Fading hairline rules ---------- */
.rule {
  border: 0;
  height: 1px;
  margin: 0 clamp(1.25rem, 5vw, 4rem);
  background: linear-gradient(to right, transparent, var(--a-50), transparent);
}
.rule-soft { background: linear-gradient(to right, transparent, var(--a-15), transparent); }
.rule-counter { background: linear-gradient(to right, transparent, color-mix(in srgb, var(--counter) 35%, transparent), transparent); }

/* ---------- Sections ---------- */
.section { padding: clamp(3.5rem, 9vh, 6rem) clamp(1.25rem, 5vw, 4rem); }
.section-heading {
  display: grid;
  gap: 1rem 3rem;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  align-items: end;
  margin-bottom: 2.5rem;
}
.section-heading h2 { margin-top: .5rem; }
.section-heading > p { color: var(--text-muted); }

/* ---------- Panels: lit, never shadowed ---------- */
.panel-grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.panel {
  position: relative;
  overflow: hidden;
  padding: 1.5rem;
  border: 1px solid var(--surface-3);
  border-radius: var(--r-lg);
  background: var(--surface-1);
}
.panel h3 { margin: .625rem 0 .5rem; }
.panel p { color: var(--text-muted); font-size: .9375rem; }
.panel-interactive { transition: transform .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease); }
.panel-interactive:hover {
  transform: translateY(-2px);
  border-color: var(--a-50);
  box-shadow: 0 0 40px var(--a-15);
}
.panel-tinted { background: linear-gradient(160deg, var(--a-08), transparent 60%), var(--surface-1); }
.panel-active { border-color: var(--a-50); box-shadow: inset 0 2px var(--accent), 0 0 30px var(--a-08); }

.scanline {
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--accent), transparent);
  opacity: .6;
  animation: scan 4s linear infinite;
}

/* ---------- Spec / palette ---------- */
.spec-layout { display: grid; gap: 1.5rem; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); align-items: start; }
.spec-list { list-style: none; margin: 0; padding: 0; display: grid; gap: .5rem; }
.spec-list li {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  align-items: center;
  gap: .875rem;
  padding: .625rem .75rem;
  border: 1px solid color-mix(in srgb, var(--surface-3) 70%, transparent);
  border-radius: var(--r-md);
  background: color-mix(in srgb, var(--surface-1) 60%, transparent);
}
.spec-list b { font-family: var(--mono); font-size: .6875rem; letter-spacing: var(--track-label); color: var(--text); font-weight: 500; }
.spec-list small { font-size: .75rem; color: var(--text-faint); }
.swatch { height: 28px; border-radius: var(--r-sm); border: 1px solid #ffffff14; }
.swatch-0 { background: var(--surface-0); }
.swatch-1 { background: var(--surface-1); }
.swatch-2 { background: var(--surface-2); }
.swatch-3 { background: var(--surface-3); }
.swatch-accent { background: var(--accent); box-shadow: 0 0 20px var(--a-50); }
.swatch-counter { background: var(--counter); }

.spec-lead { color: var(--text-hi); font-size: 1.25rem; font-weight: 600; margin: .5rem 0 .75rem; }

.chip-row { list-style: none; display: flex; flex-wrap: wrap; gap: .5rem; margin: 1.25rem 0 0; padding: 0; }
.chip {
  padding: .35rem .7rem;
  border: 1px solid var(--surface-3);
  border-radius: 999px;
  background: transparent;
  font-family: var(--mono);
  font-size: .625rem;
  letter-spacing: var(--track-label);
  color: var(--text-muted);
}
.chip-on { border-color: var(--a-50); background: var(--a-08); color: var(--accent); }

/* ---------- Modules ---------- */
.module-grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.module {
  position: relative;
  padding: 1.5rem;
  border: 1px solid var(--surface-3);
  border-radius: var(--r-lg);
  background: var(--surface-1);
  transition: transform .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.module:hover { transform: translateY(-2px); border-color: var(--a-50); box-shadow: 0 0 40px var(--a-15); }
.module-number {
  font-family: var(--mono);
  font-size: .6875rem;
  letter-spacing: var(--track-label);
  color: var(--text-faint);
}
.module h3 { margin: .75rem 0 .375rem; }
.module > p { color: var(--text-muted); font-size: .875rem; margin-bottom: 1rem; }
.module-art {
  height: 130px;
  margin-top: .875rem;
  border-radius: var(--r-md);
  border: 1px solid color-mix(in srgb, var(--surface-3) 70%, transparent);
  background-color: var(--surface-2);
}
.module-art-rings {
  background-image: repeating-radial-gradient(circle at 50% 55%, var(--a-30) 0 1px, transparent 1px 18px);
}
.module-art-wave {
  background-image: repeating-linear-gradient(90deg, var(--a-30) 0 1px, transparent 1px 12px);
  mask-image: radial-gradient(60% 80% at 50% 50%, #000, transparent);
}
.module-art-grid {
  background-image: linear-gradient(var(--a-15) 1px, transparent 1px), linear-gradient(90deg, var(--a-15) 1px, transparent 1px);
  background-size: 22px 22px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .8rem 1.25rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--mono);
  font-size: .75rem;
  letter-spacing: var(--track-label);
  text-transform: uppercase;
  font-weight: 600;
  transition: transform .15s var(--ease), box-shadow .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}
.btn-primary { background: var(--accent); color: var(--accent-ink); box-shadow: 0 0 20px var(--a-30); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 0 40px var(--a-50); }
.btn-ghost { border-color: var(--surface-3); color: var(--text); }
.btn-ghost:hover { border-color: var(--a-50); background: var(--a-08); color: var(--text-hi); }

/* ---------- Form ---------- */
.channel-intro { max-width: 60ch; color: var(--text-muted); margin: 1rem 0 2rem; }
.channel h2 { margin-top: .5rem; }
.demo-form { max-width: 640px; display: grid; gap: 1rem; }
.field-row { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.field { display: grid; gap: .5rem; }
.field label {
  font-family: var(--mono);
  font-size: .6875rem;
  letter-spacing: var(--track-label);
  text-transform: uppercase;
  color: var(--text-muted);
}
.field input, .field select, .field textarea {
  width: 100%;
  padding: .75rem .875rem;
  border: 1px solid var(--surface-3);
  border-radius: var(--r-md);
  background: var(--surface-1);
  color: var(--text-hi);
  font-size: .9375rem;
  transition: border-color .15s var(--ease), box-shadow .15s var(--ease);
}
.field textarea { resize: vertical; }
.field input::placeholder, .field textarea::placeholder { color: var(--text-faint); }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--a-15);
}
.demo-submit { justify-self: start; border: 0; }
.form-status { font-family: var(--mono); font-size: .75rem; letter-spacing: .04em; color: var(--text-faint); }
.form-status[data-state="done"] { color: var(--accent); }

/* ---------- Footer ---------- */
.site-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 2rem clamp(1.25rem, 5vw, 4rem);
  border-top: 1px solid color-mix(in srgb, var(--surface-3) 60%, transparent);
}
.site-footer p { font-size: .8125rem; color: var(--text-faint); }
.site-footer a[href="#top"] { font-family: var(--mono); font-size: .75rem; letter-spacing: var(--track-label); color: var(--text-muted); }
.site-footer a[href="#top"]:hover { color: var(--accent); }

/* ---------- Motion: ambient drift only ---------- */
@keyframes drift { from { transform: translateX(-50%) translateY(0); } to { transform: translateX(-50%) translateY(26px); } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }
@keyframes scan { from { transform: translateY(0); } to { transform: translateY(240px); } }

@media (prefers-reduced-motion: reduce) {
  .bloom-one, .readout-dot-ok { animation: none; }
  .scanline { display: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .section-heading { grid-template-columns: 1fr; align-items: start; }
  .spec-layout { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .nav-toggle { display: inline-flex; }
  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    gap: 0;
    padding: .5rem clamp(1.25rem, 5vw, 4rem) 1rem;
    background: color-mix(in srgb, var(--surface-0) 96%, transparent);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--surface-3);
  }
  .primary-nav[data-open] { display: flex; }
  .primary-nav a { padding: .75rem 0; border-bottom: 1px solid color-mix(in srgb, var(--surface-3) 50%, transparent); }
  .site-header { position: relative; flex-wrap: wrap; }
}