/* Kinetic DSP site. One stylesheet for every page; colours are tokens so
   the light scheme only redefines them. */

:root {
  color-scheme: dark light;
  --bg: #0d0e0d;
  --bg-raised: #151715;
  --card: #181a18;
  --line: #2a2d2a;
  --text: #ecede9;
  --muted: #a2a59d;
  --faint: #6f726b;
  --accent: #43b86d;
  --accent-strong: #5fd487;
  --accent-ink: #08130c;
  --accent-wash: rgba(67, 184, 109, 0.12);
  --amber: #e0a33a;
  --radius: 14px;
  --max: 1120px;
  --font: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
  --display: "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", Consolas, "SFMono-Regular", Menlo, monospace;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f6f3;
    --bg-raised: #ffffff;
    --card: #ffffff;
    --line: #dcdcd5;
    --text: #151614;
    --muted: #5a5d55;
    --faint: #8a8d84;
    --accent: #23874a;
    --accent-strong: #1c723d;
    --accent-ink: #ffffff;
    --accent-wash: rgba(35, 135, 74, 0.1);
    --amber: #a8701a;
  }
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 var(--font);
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }
a { color: var(--accent-strong); text-underline-offset: 3px; }
a:hover { color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--card); padding: 8px 12px; border-radius: 8px; z-index: 10; }
.skip:focus { left: 8px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; gap: 24px; min-height: 64px; }
.brand { display: flex; align-items: baseline; gap: 8px; color: var(--text); text-decoration: none; white-space: nowrap; }
.brand .company { font-size: 0.8rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.brand .product { font: 800 1.15rem/1 var(--display); letter-spacing: 0.14em; }
.nav { display: flex; gap: 22px; margin-left: auto; align-items: center; }
.nav a { color: var(--muted); text-decoration: none; font-size: 0.95rem; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--text); }
.nav .btn { margin-left: 4px; }
.nav .btn-primary, .nav .btn-primary:hover { color: var(--accent-ink); }
@media (max-width: 720px) {
  .nav a:not(.btn) { display: none; }
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 20px; border-radius: 10px; border: 1px solid var(--line);
  font: 600 0.98rem/1.2 var(--font); text-decoration: none; color: var(--text);
  background: transparent; cursor: pointer; transition: background 0.15s, border-color 0.15s;
}
.btn:hover { border-color: var(--faint); color: var(--text); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); color: var(--accent-ink); }
.btn-small { padding: 7px 14px; font-size: 0.9rem; }
.btn-large { padding: 14px 26px; font-size: 1.05rem; }

/* Hero */
.hero { padding: 88px 0 72px; overflow: hidden; }
.hero .wrap { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 0.85rem; font-weight: 600; color: var(--accent-strong); background: var(--accent-wash); padding: 5px 12px; border-radius: 999px; margin: 0 0 22px; }
.eyebrow::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
h1, h2, h3 { font-family: var(--display); line-height: 1.15; letter-spacing: -0.015em; margin: 0; }
h1 { font-size: clamp(2.3rem, 5vw, 3.6rem); font-weight: 750; }
h1 em { font-style: normal; color: var(--accent-strong); }
.lede { font-size: 1.15rem; color: var(--muted); margin: 22px 0 32px; max-width: 34em; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.meta { margin: 18px 0 0; font-size: 0.88rem; color: var(--faint); }
@media (max-width: 900px) {
  .hero { padding: 56px 0 48px; }
  .hero .wrap { grid-template-columns: 1fr; gap: 40px; }
}

/* Signal-flow diagram */
.flow { margin: 0; background: var(--bg-raised); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.flow svg { width: 100%; height: auto; }
.flow .node rect { fill: var(--card); stroke: var(--line); }
.flow .node.hot rect { stroke: var(--accent); fill: var(--accent-wash); }
.flow .label { fill: var(--text); font: 650 15px var(--font); }
.flow .sub { fill: var(--muted); font: 12px var(--font); }
.flow .wire { stroke: var(--faint); stroke-width: 1.5; fill: none; }
.flow .wire.live { stroke: var(--accent); stroke-dasharray: 5 5; animation: flow 1.2s linear infinite; }
.flow .arrow { fill: var(--faint); }
.flow .arrow.live { fill: var(--accent); }
@keyframes flow { to { stroke-dashoffset: -20; } }
@media (prefers-reduced-motion: reduce) { .flow .wire.live { animation: none; } }
.flow figcaption { margin-top: 12px; font-size: 0.85rem; color: var(--faint); text-align: center; }

/* Sections */
section { padding: 72px 0; }
section + section { border-top: 1px solid var(--line); }
.section-head { max-width: 40em; margin-bottom: 40px; }
.section-head h2 { font-size: clamp(1.7rem, 3.2vw, 2.3rem); font-weight: 720; }
.section-head p { color: var(--muted); margin: 14px 0 0; font-size: 1.05rem; }
.kicker { font-size: 0.8rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent-strong); margin: 0 0 12px; }

.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 900px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.card h3 { font-size: 1.15rem; font-weight: 680; margin-bottom: 10px; }
.card p { color: var(--muted); margin: 0; }
.card p + p { margin-top: 10px; }
.card ul { color: var(--muted); margin: 12px 0 0; padding-left: 1.2em; }
.card li + li { margin-top: 6px; }
.card .tag { display: inline-block; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent-strong); margin-bottom: 14px; }
.card-feature { padding: 30px; }
.card-feature h3 { font-size: 1.4rem; }

/* Quality table */
.quality { width: 100%; border-collapse: collapse; font-size: 0.98rem; }
.quality th, .quality td { text-align: left; padding: 14px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
.quality th { font-size: 0.8rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--faint); }
.quality td:first-child { font-weight: 650; white-space: nowrap; }
.quality td:nth-child(2) { font-family: var(--mono); font-size: 0.92rem; white-space: nowrap; color: var(--text); }
.quality td:last-child { color: var(--muted); }
.table-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
.table-scroll .quality tr:last-child td { border-bottom: 0; }
.note { color: var(--faint); font-size: 0.9rem; margin: 14px 0 0; }

/* Steps */
.steps { counter-reset: step; list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.steps li { counter-increment: step; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.steps li::before { content: counter(step); display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--accent-wash); color: var(--accent-strong); font-weight: 750; margin-bottom: 16px; }
.steps h3 { font-size: 1.1rem; margin-bottom: 8px; }
.steps p { color: var(--muted); margin: 0; }
.steps p + p { margin-top: 10px; }
@media (max-width: 900px) { .steps { grid-template-columns: 1fr; } }

/* FAQ */
.faq { max-width: 52em; }
.faq details { border-bottom: 1px solid var(--line); padding: 4px 0; }
.faq summary { cursor: pointer; list-style: none; padding: 16px 32px 16px 0; font-weight: 640; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 4px; top: 12px; font-size: 1.4rem; color: var(--faint); }
.faq details[open] summary::after { content: "−"; }
.faq details p { color: var(--muted); margin: 0 0 18px; }

/* Call to action band */
.cta { text-align: center; }
.cta h2 { font-size: clamp(1.7rem, 3.2vw, 2.4rem); }
.cta p { color: var(--muted); margin: 14px auto 28px; max-width: 34em; }
.cta .actions { justify-content: center; }

/* Download page */
.download-hero { padding: 72px 0 48px; }
.download-hero h1 { font-size: clamp(2rem, 4.4vw, 3rem); }
.download-card { display: flex; flex-direction: column; gap: 16px; }
.download-card .btn { align-self: flex-start; }
.download-notice { margin-top: 18px; }
.requirements-head { margin-top: 56px; }
.version { font-family: var(--mono); font-size: 0.9rem; color: var(--faint); }
.checklist { list-style: none; padding: 0; margin: 0; }
.checklist li { padding-left: 28px; position: relative; color: var(--muted); }
.checklist li + li { margin-top: 10px; }
.checklist li::before { content: "✓"; position: absolute; left: 0; color: var(--accent-strong); font-weight: 700; }
.callout { border: 1px solid var(--amber); background: color-mix(in srgb, var(--amber) 9%, transparent); border-radius: var(--radius); padding: 20px 24px; }
.callout h3 { font-size: 1.05rem; margin-bottom: 6px; }
.callout p { margin: 0; color: var(--muted); }

/* Long-form pages (privacy, terms, contact) */
.prose { max-width: 46em; padding: 64px 0 80px; }
.prose h1 { font-size: clamp(2rem, 4vw, 2.6rem); margin-bottom: 8px; }
.prose .updated { color: var(--faint); font-size: 0.92rem; margin: 0 0 36px; }
.prose h2 { font-size: 1.35rem; margin: 40px 0 12px; }
.prose h3 { font-size: 1.08rem; margin: 26px 0 8px; }
.prose p, .prose li { color: var(--muted); }
.prose strong { color: var(--text); }
.prose ul { padding-left: 1.3em; }
.prose li + li { margin-top: 6px; }
.prose dl { display: grid; grid-template-columns: max-content 1fr; gap: 8px 24px; margin: 0; }
.prose dt { color: var(--faint); }
.prose dd { margin: 0; color: var(--text); }
@media (max-width: 560px) { .prose dl { grid-template-columns: 1fr; gap: 2px; } .prose dd { margin-bottom: 10px; } }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 40px 0 48px; color: var(--faint); font-size: 0.9rem; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 20px 40px; justify-content: space-between; align-items: flex-start; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 10px 22px; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--text); }
.site-footer .brand-line { color: var(--muted); }
.site-footer .brand-line strong { color: var(--text); letter-spacing: 0.06em; }

.steps-single { grid-template-columns: 1fr; }
.spaced { margin-top: 18px; }
code { font-family: var(--mono); font-size: 0.88em; background: var(--bg-raised); border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; overflow-wrap: anywhere; }
@media (max-width: 900px) { .flow { padding: 14px; } }
.card .hint { color: var(--faint); font-size: 0.92rem; }