/* Firmware flasher pages – docs.sasakaranovic.com
   Pages are generated by hooks/firmware.py; this file is shared by all of them. */

:root {
  --bg: #070a12;
  --bg-2: #0d1220;
  --surface: rgba(20, 26, 42, 0.62);
  --surface-strong: rgba(28, 35, 56, 0.85);
  --border: rgba(148, 163, 214, 0.16);
  --border-strong: rgba(148, 163, 214, 0.32);
  --text: #e8ecf6;
  --muted: #9aa4bf;
  --faint: #6b7592;
  --accent: #5eead4;
  --accent-2: #818cf8;
  --accent-ink: #04121a;
  --warn-bg: rgba(251, 191, 36, 0.08);
  --warn-border: rgba(251, 191, 36, 0.35);
  --warn-text: #fcd34d;
  --blob-a: #2dd4bf;
  --blob-b: #6366f1;
  --blob-c: #c026d3;
  --blob-opacity: 0.30;
  --grid: rgba(148, 163, 214, 0.07);
  --shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 20px 50px -24px rgba(0, 0, 0, 0.7);
  --radius: 18px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Open Sans", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "Roboto Mono", Menlo, Consolas, monospace;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f7fc;
    --bg-2: #eef1f9;
    --surface: rgba(255, 255, 255, 0.72);
    --surface-strong: rgba(255, 255, 255, 0.92);
    --border: rgba(30, 41, 82, 0.10);
    --border-strong: rgba(30, 41, 82, 0.22);
    --text: #111827;
    --muted: #4b5563;
    --faint: #6b7280;
    --accent: #0d9488;
    --accent-2: #4f46e5;
    --accent-ink: #ffffff;
    --warn-bg: rgba(245, 158, 11, 0.08);
    --warn-border: rgba(217, 119, 6, 0.35);
    --warn-text: #92400e;
    --blob-opacity: 0.22;
    --grid: rgba(30, 41, 82, 0.06);
    --shadow: 0 20px 50px -28px rgba(30, 41, 82, 0.35);
    color-scheme: light;
  }
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  color: var(--text);
  background: radial-gradient(1200px 800px at 50% -10%, var(--bg-2), var(--bg) 60%) fixed, var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

.mono { font-family: var(--mono); font-size: 0.92em; }
.dot { color: var(--faint); padding: 0 0.15em; }
.nb { white-space: nowrap; }

/* ------------------------------------------------------------------ background */

.bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.bg-blob {
  position: absolute;
  width: 46vmax;
  height: 46vmax;
  border-radius: 50%;
  filter: blur(80px);
  opacity: var(--blob-opacity);
  will-change: transform;
}

.bg-blob--a { background: var(--blob-a); top: -18vmax; left: -12vmax; animation: drift-a 38s ease-in-out infinite alternate; }
.bg-blob--b { background: var(--blob-b); top: 10vmax; right: -16vmax; animation: drift-b 46s ease-in-out infinite alternate; }
.bg-blob--c { background: var(--blob-c); bottom: -24vmax; left: 20vmax; opacity: calc(var(--blob-opacity) * 0.6); animation: drift-c 54s ease-in-out infinite alternate; }

.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 30%, transparent 75%);
          mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 30%, transparent 75%);
}

@keyframes drift-a { to { transform: translate3d(14vmax, 10vmax, 0) scale(1.15); } }
@keyframes drift-b { to { transform: translate3d(-12vmax, 14vmax, 0) scale(0.9); } }
@keyframes drift-c { to { transform: translate3d(-10vmax, -12vmax, 0) scale(1.1); } }

/* ------------------------------------------------------------------ layout */

.shell {
  position: relative;
  z-index: 1;
  max-width: 820px;
  margin: 0 auto;
  padding: 24px 24px 48px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 4px 0 40px;
}

.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); font-weight: 600; letter-spacing: 0.01em; }
.brand:hover { text-decoration: none; }
.brand-logo { width: 28px; height: 28px; }
@media (prefers-color-scheme: dark) { .brand-logo { filter: invert(1); } }

.topnav { display: flex; gap: 20px; font-size: 0.92rem; }
.topnav a { color: var(--muted); }
.topnav a:hover { color: var(--text); text-decoration: none; }

.hero { margin-bottom: 28px; }
.eyebrow {
  margin: 0 0 8px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}
.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  background: linear-gradient(120deg, var(--text) 30%, var(--accent) 75%, var(--accent-2));
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
}
.lead { margin: 0 0 8px; font-size: 1.08rem; color: var(--muted); max-width: 60ch; }
.scope { margin: 0; font-size: 0.92rem; color: var(--faint); }

/* ------------------------------------------------------------------ cards */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 18px;
  box-shadow: var(--shadow);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
          backdrop-filter: blur(16px) saturate(140%);
}

.card > .hint { margin-top: 14px; }

.card h2 {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 18px;
  font-size: 1.12rem;
  font-weight: 650;
}

.step {
  display: inline-grid;
  place-items: center;
  flex: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-ink);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}

/* ------------------------------------------------------------------ build list */

.releases { display: grid; gap: 10px; }

.release {
  position: relative;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: transparent;
  cursor: pointer;
  transition: border-color 0.25s ease, background-color 0.25s ease, transform 0.25s ease;
}
.release:hover { border-color: var(--border-strong); transform: translateY(-1px); }
.release:has(input:checked) {
  border-color: color-mix(in srgb, var(--accent) 60%, transparent);
  background: color-mix(in srgb, var(--accent) 7%, transparent);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 35%, transparent), 0 10px 30px -18px var(--accent);
}

.release input {
  appearance: none;
  flex: none;
  width: 18px;
  height: 18px;
  margin: 3px 0 0;
  border: 2px solid var(--border-strong);
  border-radius: 50%;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.release input:checked { border-color: var(--accent); box-shadow: inset 0 0 0 3px var(--surface-strong), inset 0 0 0 9px var(--accent); }
.release input:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.release-body { display: grid; gap: 4px; min-width: 0; }
.release-head { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.release-label { font-weight: 600; }
.release-meta { font-size: 0.88rem; color: var(--muted); }
.release-notes { font-size: 0.88rem; color: var(--faint); }

.badge {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid var(--border-strong);
  color: var(--muted);
}
.badge--recommended { color: var(--accent-ink); background: var(--accent); border-color: transparent; }
.badge--preview { color: #fbbf24; border-color: rgba(251, 191, 36, 0.45); }
.badge--tool { color: #a5b4fc; border-color: rgba(165, 180, 252, 0.45); }
@media (prefers-color-scheme: light) {
  .badge--preview { color: #b45309; border-color: rgba(180, 83, 9, 0.4); }
  .badge--tool { color: #4338ca; border-color: rgba(67, 56, 202, 0.35); }
}

/* ------------------------------------------------------------------ version picker */

.releases + .picker { margin-top: 18px; }
.picker { display: grid; gap: 10px; }
.picker-label { font-size: 0.82rem; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--faint); }

.select-wrap { position: relative; }
.select-wrap::after {
  content: "";
  position: absolute;
  right: 16px;
  top: 50%;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}
.select-wrap select {
  width: 100%;
  appearance: none;
  padding: 12px 44px 12px 14px;
  font: inherit;
  font-family: var(--mono);
  font-size: 0.92rem;
  color: var(--text);
  background: var(--surface-strong);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  cursor: pointer;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.select-wrap select:hover { border-color: color-mix(in srgb, var(--accent) 50%, transparent); }
.select-wrap select:focus-visible { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent); }
.select-wrap select:disabled { cursor: default; opacity: 0.7; }
.select-wrap option, .select-wrap optgroup { background: var(--bg-2); color: var(--text); }

.build-details:empty { display: none; }
.build-details {
  display: grid;
  gap: 8px;
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--accent) 5%, transparent);
  animation: reveal 0.35s ease both;
}
.build-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 12px; font-size: 0.9rem; color: var(--muted); }
.build-notes { margin: 0; font-size: 0.92rem; color: var(--text); white-space: pre-line; }
.build-links { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 0.82rem; color: var(--faint); }
.build-warn { margin: 0; font-size: 0.85rem; color: var(--warn-text); }

.badge--stable { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.badge--dev { color: #f87171; border-color: rgba(248, 113, 113, 0.45); }

/* ------------------------------------------------------------------ steps */

.steps { margin: 0; padding: 0; list-style: none; counter-reset: s; display: grid; gap: 10px; }
.steps li {
  counter-increment: s;
  position: relative;
  padding-left: 38px;
  color: var(--text);
}
.steps li::before {
  content: counter(s);
  position: absolute;
  left: 0;
  top: 0;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 650;
  color: var(--muted);
  border: 1px solid var(--border-strong);
}

/* ------------------------------------------------------------------ install */

.callout {
  margin: 0 0 18px;
  padding: 14px 16px;
  border: 1px solid var(--warn-border);
  border-radius: 12px;
  background: var(--warn-bg);
}
.callout strong { display: block; margin-bottom: 4px; color: var(--warn-text); }
.callout ul { margin: 0; padding-left: 20px; color: var(--text); }
.callout li + li { margin-top: 4px; }

.confirm {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin: 0 0 18px;
  cursor: pointer;
  color: var(--muted);
}
.confirm input { width: 18px; height: 18px; margin: 3px 0 0; accent-color: var(--accent); }

.install { display: grid; justify-items: start; gap: 10px; }

.btn {
  position: relative;
  display: inline-grid;
  gap: 2px;
  justify-items: start;
  padding: 14px 26px;
  border: 0;
  border-radius: 14px;
  font: inherit;
  font-weight: 650;
  font-size: 1.02rem;
  color: var(--accent-ink);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 12px 30px -12px color-mix(in srgb, var(--accent) 70%, transparent);
  cursor: pointer;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease, filter 0.2s ease;
}
.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, transparent 30%, rgba(255, 255, 255, 0.35) 50%, transparent 70%);
  transform: translateX(-120%);
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 16px 36px -12px color-mix(in srgb, var(--accent) 80%, transparent); }
.btn:hover::after { animation: shine 1.1s ease; }
.btn:active { transform: translateY(0); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.btn:disabled { cursor: not-allowed; opacity: 0.45; filter: saturate(0.4); transform: none; box-shadow: none; }
.btn:disabled::after { display: none; }
.btn-sub { font-size: 0.78rem; font-weight: 500; opacity: 0.8; }

@keyframes shine { to { transform: translateX(120%); } }

.hint { margin: 0; font-size: 0.86rem; color: var(--faint); }

.unsupported {
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid var(--border-strong);
  background: var(--surface-strong);
  color: var(--muted);
}
.unsupported strong { display: block; color: var(--text); }
esp-web-install-button[install-unsupported] ~ .hint { display: none; }

.notice {
  margin: 0 0 18px;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid var(--warn-border);
  background: var(--warn-bg);
  color: var(--text);
  font-size: 0.92rem;
}

/* ------------------------------------------------------------------ index page */

.products { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }

.product {
  position: relative;
  display: grid;
  gap: 6px;
  align-content: start;
  padding: 22px 22px 46px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
  color: var(--text);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
          backdrop-filter: blur(16px) saturate(140%);
  transition: transform 0.25s ease, border-color 0.25s ease;
}
.product:hover { text-decoration: none; transform: translateY(-3px); border-color: color-mix(in srgb, var(--accent) 55%, transparent); }
.product-name { font-size: 1.15rem; font-weight: 650; }
.product-desc { color: var(--muted); font-size: 0.92rem; }
.product-meta { color: var(--faint); font-size: 0.85rem; }
.product-go { position: absolute; right: 20px; bottom: 16px; color: var(--accent); font-size: 1.2rem; transition: transform 0.25s ease; }
.product:hover .product-go { transform: translateX(4px); }

/* ------------------------------------------------------------------ footer */

.footer { margin-top: 36px; font-size: 0.82rem; color: var(--faint); }
.footer p { margin: 4px 0; }
.footer a { color: var(--muted); }

/* ------------------------------------------------------------------ motion */

/* Staggered fade-in on load (CSS only, so content shows even without JavaScript). */
.reveal { animation: reveal 0.6s cubic-bezier(0.2, 0.7, 0.2, 1) both; animation-delay: calc(var(--i, 0) * 70ms); }
main > :nth-child(1), .products > :nth-child(1) { --i: 1; }
main > :nth-child(2), .products > :nth-child(2) { --i: 2; }
main > :nth-child(3), .products > :nth-child(3) { --i: 3; }
main > :nth-child(4), .products > :nth-child(4) { --i: 4; }
main > :nth-child(5), .products > :nth-child(5) { --i: 5; }
main > :nth-child(n+6), .products > :nth-child(n+6) { --i: 6; }
.footer { --i: 7; }
@keyframes reveal { from { opacity: 0; transform: translateY(10px); } }

.notice:not([hidden]) { animation: reveal 0.4s ease both; }

@media (prefers-reduced-motion: reduce) {
  .bg-blob, .reveal, .notice, .btn:hover::after { animation: none !important; }
  * { transition-duration: 0.01ms !important; }
}

/* ------------------------------------------------------------------ small screens */

@media (max-width: 600px) {
  .shell { padding: 16px 16px 40px; }
  .topbar { padding-bottom: 28px; }
  .topnav { gap: 14px; }
  .brand span { display: none; }
  .card { padding: 18px; }
  esp-web-install-button { display: block; width: 100%; }
  .btn { width: 100%; justify-items: center; }
}