/* BandEar website — design preview. Dark theme only, self-hosted OFL fonts, no external resources. */

@font-face {
  font-family: "IBM Plex Sans";
  src: url("assets/fonts/ibm_plex_sans_variable.ttf") format("truetype");
  font-weight: 100 700;
  font-display: swap;
}

@font-face {
  font-family: "JetBrains Mono";
  src: url("assets/fonts/jetbrains_mono_variable.ttf") format("truetype");
  font-weight: 100 800;
  font-display: swap;
}

:root {
  --bg: #192223;
  --bg-deep: #0f1416;
  --surface: #1f2a2b;
  --surface-2: #253233;
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.16);
  --text: #f1f4f3;
  --text-muted: #a9b7b6;
  --accent: #ffbf43;
  --accent-ink: #1a1405;
  --accent-soft: rgba(255, 191, 67, 0.12);
  --radius: 14px;
  --radius-lg: 22px;
  --gutter: clamp(16px, 4vw, 40px);
  --font-sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "Cascadia Code", Consolas, monospace;
  color-scheme: dark;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  overflow-x: hidden;
}

img,
svg {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

a {
  color: var(--accent);
  text-underline-offset: 3px;
}

h1,
h2,
h3 {
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin: 0;
}

p {
  margin: 0;
}

code,
.file {
  font-family: var(--font-mono);
}

code {
  font-size: 0.875em;
  color: var(--text);
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 100;
  padding: 10px 16px;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus {
  top: 12px;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container-narrow {
  max-width: 860px;
}

.accent {
  color: var(--accent);
}

.muted {
  color: var(--text-muted);
  font-weight: 400;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(15, 20, 22, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 650;
  font-size: 1.125rem;
  text-decoration: none;
}

.site-nav {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.site-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  padding: 8px 12px;
  border-radius: 8px;
}

.site-nav a:hover {
  color: var(--text);
  background: var(--surface);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.lang-toggle,
.icon-link {
  display: inline-grid;
  place-items: center;
  min-width: 40px;
  height: 40px;
  padding: 0 10px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: transparent;
  color: var(--text);
  font: 600 0.8125rem var(--font-mono);
  letter-spacing: 0.04em;
  cursor: pointer;
}

.lang-toggle:hover,
.icon-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 12px 22px;
  border-radius: 12px;
  border: 1px solid var(--line-strong);
  background: var(--surface-2);
  color: var(--text);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: transform 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
}

.btn:hover {
  border-color: var(--accent);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
  box-shadow: 0 10px 30px -10px rgba(255, 191, 67, 0.55);
}

.btn-primary:hover {
  background: #ffcb66;
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
}

.btn-small {
  min-height: 40px;
  padding: 8px 16px;
  font-size: 0.9375rem;
}

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

.hero {
  position: relative;
  padding: clamp(48px, 8vw, 96px) 0 clamp(40px, 6vw, 72px);
  background:
    radial-gradient(60% 50% at 80% 10%, rgba(255, 191, 67, 0.10), transparent 70%),
    linear-gradient(180deg, var(--bg-deep), var(--bg) 85%);
  overflow: hidden;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}

.hero-mark {
  width: 72px;
  height: 72px;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(2.125rem, 4.6vw, 3.5rem);
  font-weight: 650;
  margin-bottom: 20px;
}

.lede {
  font-size: clamp(1.0625rem, 1.5vw, 1.25rem);
  color: var(--text-muted);
  max-width: 34em;
  margin-bottom: 32px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}

.cta-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Second choice under the download button (Intel Mac, .deb), filled in by js/downloads.js. */
.cta-alt {
  margin: -4px 0 14px;
  font-size: 0.9375rem;
  color: var(--text-muted);
}

.cta-alt a {
  color: var(--accent);
}

.chip {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid rgba(255, 191, 67, 0.3);
}

.hero-shot {
  margin: 0;
}

.window {
  border-radius: var(--radius);
  border: 1px solid var(--line-strong);
  background: var(--bg-deep);
  overflow: hidden;
  box-shadow: 0 40px 80px -30px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(255, 191, 67, 0.06);
}

.window-bar {
  display: flex;
  gap: 7px;
  padding: 11px 14px;
  border-bottom: 1px solid var(--line);
}

.window-bar i {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--surface-2);
}

.window-bar i:first-child {
  background: var(--accent);
}

.stats {
  list-style: none;
  margin-top: clamp(40px, 6vw, 72px);
  margin-bottom: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.stats li {
  padding: 18px 20px;
  border-left: 2px solid var(--accent);
  background: rgba(255, 255, 255, 0.025);
  border-radius: 0 10px 10px 0;
}

.stats strong {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  font-weight: 700;
  color: var(--text);
}

.stats span {
  font-size: 0.9375rem;
  color: var(--text-muted);
}

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

.section {
  padding: clamp(64px, 9vw, 112px) 0;
}

.section-alt {
  background: var(--bg-deep);
  border-block: 1px solid var(--line);
}

.section-head {
  max-width: 720px;
  margin-bottom: clamp(32px, 5vw, 56px);
}

.section-head h2 {
  font-size: clamp(1.75rem, 3.4vw, 2.5rem);
  font-weight: 650;
}

.section-head p:not(.eyebrow) {
  margin-top: 16px;
  color: var(--text-muted);
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}

.card h3 {
  font-size: 1.1875rem;
  font-weight: 620;
  margin-bottom: 10px;
}

.card p {
  color: var(--text-muted);
}

/* ---------- How it works ---------- */

.diagram {
  margin: 0 0 40px;
  padding: clamp(16px, 3vw, 32px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background:
    radial-gradient(50% 80% at 50% 50%, rgba(255, 191, 67, 0.06), transparent 70%),
    var(--bg-deep);
}

.diagram svg {
  width: 100%;
  height: auto;
}

.d-device rect,
.d-device circle,
.d-device path {
  fill: var(--surface-2);
  stroke: rgba(255, 255, 255, 0.28);
  stroke-width: 2;
}

.d-device .d-screen {
  fill: var(--bg-deep);
}

.d-device .d-led {
  fill: var(--accent);
  stroke: none;
}

.d-device .d-led-dim {
  fill: rgba(255, 191, 67, 0.4);
  stroke: none;
}

.d-slot rect {
  fill: var(--bg-deep);
}

.d-cap rect {
  fill: #c9d1cf;
}

.d-small {
  fill: var(--accent);
  font: 600 14px var(--font-mono);
  text-anchor: middle;
}

.d-faders rect {
  fill: var(--accent);
}

.d-wifi path {
  stroke: var(--accent);
  stroke-width: 5;
  stroke-linecap: round;
}

.d-link {
  fill: none;
  stroke: var(--accent);
  stroke-width: 3;
  stroke-linecap: round;
}

.d-dash {
  stroke-dasharray: 2 9;
}

.d-label {
  fill: var(--text-muted);
  font: 500 19px var(--font-sans);
  text-anchor: middle;
}

.d-left {
  text-anchor: start;
}

.d-badge circle {
  fill: var(--accent);
}

.d-badge text {
  fill: var(--accent-ink);
  font: 700 19px var(--font-mono);
  text-anchor: middle;
}

.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.step-num {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  margin-bottom: 16px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-ink);
  font: 700 1rem var(--font-mono);
}

/* ---------- Features ---------- */

.features {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.feature {
  padding: 28px;
}

.feature-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 18px;
  padding: 6px;
  border-radius: 10px;
  background: var(--accent-soft);
  fill: none;
  stroke: var(--accent);
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.feature-icon .fill {
  fill: var(--accent);
  stroke: none;
}

.feature ul {
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--text-muted);
}

.feature li {
  position: relative;
  padding-left: 22px;
  margin-top: 8px;
}

.feature li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.68em;
  width: 8px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
}

/* ---------- Screenshots ---------- */

.gallery {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.shot {
  display: block;
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background: var(--bg-deep);
  color: var(--text);
  text-decoration: none;
}

.shot img {
  width: 100%;
  transition: transform 0.3s ease;
}

.shot:hover img {
  transform: scale(1.02);
}

.shot-caption {
  display: block;
  padding: 12px 16px;
  font-weight: 550;
  font-size: 0.9375rem;
  border-top: 1px solid var(--line);
}

/* ---------- Downloads ---------- */

.downloads {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.dl {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dl h3 {
  margin-bottom: 0;
}

.dl .file {
  font-size: 0.8125rem;
  color: var(--accent);
  overflow-wrap: anywhere;
}

.dl .note {
  font-size: 0.9375rem;
  flex-grow: 1;
}

.dl .btn {
  align-self: flex-start;
}

.btn-pair {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.dl-phone {
  border-color: rgba(255, 191, 67, 0.35);
}

.dl-soon {
  background: transparent;
  border-style: dashed;
  border-color: var(--line-strong);
}

.dl-soon .file {
  color: var(--text-muted);
}

/* The visitor's own system, as detected by js/downloads.js. */
.dl.is-yours {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), 0 18px 40px -24px rgba(255, 191, 67, 0.6);
}

/* ---------- FAQ ---------- */

.faq {
  display: grid;
  gap: 12px;
}

.faq details {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.faq details[open] {
  border-color: rgba(255, 191, 67, 0.3);
}

.faq summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "+";
  flex-shrink: 0;
  font: 500 1.375rem/1 var(--font-mono);
  color: var(--accent);
}

.faq details[open] summary::after {
  content: "−";
}

.faq details p {
  padding: 0 22px 20px;
  color: var(--text-muted);
}

/* ---------- Sponsor ---------- */

.sponsor {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(20px, 4vw, 40px);
  padding: clamp(28px, 5vw, 48px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 191, 67, 0.28);
  background:
    radial-gradient(70% 120% at 100% 0%, rgba(255, 191, 67, 0.14), transparent 60%),
    var(--surface);
}

.sponsor img {
  width: 88px;
  height: 88px;
  border-radius: 20px;
}

.sponsor h2 {
  font-size: clamp(1.5rem, 2.8vw, 2rem);
  font-weight: 650;
  margin-bottom: 10px;
}

.sponsor p {
  color: var(--text-muted);
  max-width: 40em;
}

.sponsor-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-deep);
  padding: 32px 0;
  font-size: 0.9375rem;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 32px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
  margin-left: auto;
}

.footer-links a {
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--accent);
}

/* ---------- 3D layers ----------
   The inline script in <head> adds `.webgl` to <html> before first paint when WebGL 2 is
   available. Only then are the canvas hosts laid out, already at their final size so nothing
   shifts later. Each figure's `data-scene` (js/scene-state.js) decides what shows:
     absent    loading: the canvas is transparent and the static visual sits over it, centred;
     "live"    the scene drew its first frame: the canvas fades in, the static visual out;
     "static"  the scene failed: the canvas host is removed from the layout, static design back.
   Without `.webgl` the static design stays. Canvases are decorative and never take pointer
   events. */

.hero-3d,
.flow-3d {
  display: none;
  opacity: 0;
  transition: opacity 0.5s ease;
}

[data-scene="live"] .hero-3d,
[data-scene="live"] .flow-3d {
  opacity: 1;
}

/* The static visual, laid over the canvas host while the scene loads. */
.webgl .hero-shot:not([data-scene="static"]) > .window,
.webgl .diagram:not([data-scene="static"]) > svg {
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  transition:
    opacity 0.5s ease,
    visibility 0s linear 0.5s;
}

/* Once the scene draws, the static visual fades out. */
.webgl [data-scene="live"] > .window {
  opacity: 0;
  visibility: hidden;
}

/* The SVG diagram stays in the accessibility tree for screen readers. */
.webgl .diagram[data-scene="live"] > svg {
  opacity: 0;
  pointer-events: none;
}

.hero-3d canvas,
.flow-3d canvas,
.bg-3d canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.hero-3d,
.flow-3d,
.bg-3d {
  pointer-events: none;
}

.webgl .hero-shot:not([data-scene="static"]) {
  position: relative;
}

.webgl .hero-shot:not([data-scene="static"]) .hero-3d {
  display: block;
  position: relative;
  aspect-ratio: 1 / 0.86;
}

/* The 3D mark replaces the small static mark above the headline. */
.webgl .hero-inner:has(.hero-shot:not([data-scene="static"])) .hero-mark {
  display: none;
}

.webgl .diagram:not([data-scene="static"]) {
  position: relative;
}

.webgl .diagram:not([data-scene="static"]) .flow-3d {
  display: block;
  position: relative;
  aspect-ratio: 16 / 7;
}

/* Inside the diagram's padding, like the 3D version. */
.webgl .diagram:not([data-scene="static"]) > svg {
  padding-inline: inherit;
}

.flow-labels {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.flow-label {
  position: absolute;
  left: 0;
  top: 0;
  padding: 2px 8px;
  border-radius: 6px;
  background: rgba(15, 20, 22, 0.72);
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  will-change: transform;
}

.bg-3d {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100vh;
  height: 100lvh;
  z-index: -1;
}

/* Let the background field show faintly through the darker bands. */
.webgl .section-alt {
  background: rgba(15, 20, 22, 0.78);
}

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

@media (max-width: 1024px) {
  .downloads {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sponsor {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .sponsor-actions {
    grid-column: 1 / -1;
    flex-direction: row;
    flex-wrap: wrap;
  }
}

@media (max-width: 900px) {
  .site-nav {
    display: none;
  }

  .header-actions {
    margin-left: auto;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .steps {
    grid-template-columns: minmax(0, 1fr);
  }

  /* Single column: the 3D mark leads, above the headline. */
  .webgl .hero-shot:not([data-scene="static"]) {
    order: -1;
  }

  .webgl .hero-shot:not([data-scene="static"]) .hero-3d {
    aspect-ratio: 16 / 10;
    max-height: 360px;
    margin-inline: auto;
  }

  /* While loading, keep the screenshot about as tall as the 3D mark's box. */
  .webgl .hero-shot:not([data-scene="static"]) > .window {
    width: min(100%, 520px);
    margin-inline: auto;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 1rem;
  }

  .features,
  .gallery,
  .downloads {
    grid-template-columns: minmax(0, 1fr);
  }

  .cta-row .btn {
    flex: 1 1 100%;
  }

  .stats {
    gap: 10px;
  }

  .stats li {
    padding: 14px 14px;
  }

  .sponsor {
    grid-template-columns: minmax(0, 1fr);
    text-align: left;
  }

  .sponsor img {
    width: 64px;
    height: 64px;
    border-radius: 16px;
  }

  .sponsor-actions .btn {
    flex: 1 1 100%;
  }

  .footer-links {
    margin-left: 0;
  }

  /* The diagram is wide; give it room to stay legible on phones. */
  .diagram {
    padding: 12px 8px;
  }

  .d-label {
    font-size: 26px;
  }

  .d-badge text {
    font-size: 22px;
  }

  .webgl .diagram:not([data-scene="static"]) .flow-3d {
    aspect-ratio: 4 / 5;
  }

  .flow-label {
    font-size: 0.8125rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}