:root {
  --cobalt: #1d4e9e;
  --cobalt-deep: #143b7c;
  --teal: #2e9e93;
  --teal-deep: #23786f;
  --terracotta: #c9663f;
  --terracotta-deep: #a34e2d;
  --verde: #5e8c4a;
  --verde-deep: #47703a;
  --limone: #f3c74f;
  --cream: #faf3e3;
  --cream-soft: #fffbf1;
  --ink: #22304a;
  --ink-soft: #51607d;
  --line: rgba(29, 78, 158, 0.16);
  --shadow: 0 10px 30px rgba(20, 59, 124, 0.16), 0 2px 6px rgba(20, 59, 124, 0.10);
  --shadow-big: 0 24px 60px rgba(20, 59, 124, 0.22), 0 4px 10px rgba(20, 59, 124, 0.12);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  font-family: "Work Sans", system-ui, sans-serif;
  color: var(--ink);
  background:
    linear-gradient(rgba(250, 243, 227, 0.9), rgba(250, 243, 227, 0.9)),
    url("pattern.svg");
  background-size: auto, 168px 168px;
}

/* ---------- hero ---------- */

.hero {
  background: url("pattern.svg") left bottom repeat;
  background-size: 168px 168px;
  padding: 68px 24px 92px;
  position: relative;
}
.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 -8px 0;
  height: 26px;
  background: url("sawtooth-hero.svg") left bottom repeat-x;
  background-size: 88px 26px;
}

.plaque {
  max-width: 620px;
  margin: 0 auto;
  background: var(--cream-soft);
  border: 3px solid var(--cobalt);
  box-shadow: inset 0 0 0 6px var(--cream-soft), inset 0 0 0 8px var(--limone), var(--shadow-big);
  border-radius: 28px;
  padding: 44px 48px 38px;
  text-align: center;
}

.mark { width: 74px; height: 74px; color: var(--verde); fill: var(--verde); }

h1 {
  font-family: "Fraunces", serif;
  font-weight: 650;
  font-size: clamp(3rem, 8vw, 4.6rem);
  letter-spacing: 0.01em;
  margin: 6px 0 10px;
  color: var(--cobalt-deep);
}

.tagline {
  font-size: 1.06rem;
  color: var(--ink-soft);
  margin: 0 auto 18px;
  max-width: 40ch;
  line-height: 1.55;
}

.release-chip {
  display: inline-block;
  margin: 0;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--terracotta-deep);
  background: rgba(243, 199, 79, 0.28);
  border: 1.5px solid var(--limone);
  border-radius: 999px;
  padding: 7px 18px;
}

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

main { max-width: 1060px; margin: 0 auto; padding: 44px 24px 60px; }

.howto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-bottom: 34px;
}
.step {
  background: var(--cream-soft);
  border: 1.5px solid var(--line);
  border-radius: 16px;
  padding: 18px 20px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  box-shadow: 0 2px 8px rgba(20, 59, 124, 0.06);
}
.step .n {
  flex: none;
  width: 34px; height: 34px;
  border-radius: 50%;
  background: var(--cobalt);
  color: var(--cream);
  font-family: "Fraunces", serif;
  font-weight: 650;
  font-size: 1.1rem;
  display: grid;
  place-items: center;
}
.step:nth-child(2) .n { background: var(--teal); }
.step:nth-child(3) .n { background: var(--terracotta); }
.step p { margin: 4px 0 0; line-height: 1.5; font-size: 0.95rem; }
#device-status { display: block; margin-top: 8px; font-size: 0.85rem; color: var(--ink-soft); }
#device-status.ok { color: var(--verde-deep); font-weight: 600; }

.notice {
  background: #fdeee4;
  border: 1.5px solid var(--terracotta);
  color: var(--terracotta-deep);
  border-radius: 14px;
  padding: 14px 18px;
  margin-bottom: 28px;
  line-height: 1.5;
}

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

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 26px;
}

.card {
  background: var(--cream-soft);
  border-radius: 20px;
  overflow: hidden;
  border: 1.5px solid var(--line);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-big); }

.card-head {
  position: relative;
  padding: 20px 22px 16px;
  color: var(--cream-soft);
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-head::after {
  content: "";
  position: absolute;
  inset: auto 0 -1px 0;
  height: 9px;
  background: url("sawtooth-card.svg") left bottom repeat-x;
  background-size: 20px 9px;
}
.card-head .fw-mark {
  position: absolute;
  right: -14px; top: -18px;
  width: 110px; height: 110px;
  opacity: 0.18;
  transform: rotate(12deg);
}
.card-head h2 {
  font-family: "Fraunces", serif;
  font-style: italic;
  font-weight: 700;
  font-size: 1.7rem;
  margin: 0;
  text-transform: capitalize;
  letter-spacing: 0.01em;
}
.ver {
  font-size: 0.78rem;
  font-weight: 600;
  background: rgba(250, 243, 227, 0.25);
  border: 1px solid rgba(250, 243, 227, 0.55);
  padding: 3px 10px;
  border-radius: 999px;
}

.card.cobalt .card-head { background: var(--cobalt); }
.card.teal .card-head { background: var(--teal); }
.card.terracotta .card-head { background: var(--terracotta); }
.card.verde .card-head { background: var(--verde); }

.card-body { padding: 18px 22px 20px; display: flex; flex-direction: column; gap: 14px; flex: 1; }
.desc { margin: 0; line-height: 1.55; font-size: 0.94rem; color: var(--ink-soft); }

.controls h3 {
  font-family: "Fraunces", serif;
  font-size: 1.02rem;
  font-weight: 650;
  margin: 0 0 8px;
  color: var(--cobalt-deep);
}
.controls table { width: 100%; border-collapse: collapse; font-size: 0.86rem; }
.controls td, .controls th {
  text-align: left;
  padding: 5px 8px;
  border-bottom: 1px dashed var(--line);
}
.controls th { color: var(--ink-soft); font-weight: 600; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; }
.controls td:first-child { font-weight: 600; white-space: nowrap; width: 1%; }
.controls tr:last-child td { border-bottom: none; }

.card-foot {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.readme-link { font-size: 0.86rem; color: var(--ink-soft); text-decoration: none; border-bottom: 1.5px dotted var(--line); }
.readme-link:hover { color: var(--cobalt); }

/* ---------- buttons & progress ---------- */

.btn {
  font: inherit;
  font-weight: 600;
  border: none;
  border-radius: 999px;
  padding: 10px 26px;
  cursor: pointer;
  color: var(--cream-soft);
  background: var(--cobalt);
  transition: filter 0.15s ease, transform 0.1s ease;
}
.btn:hover:not(:disabled) { filter: brightness(1.12); }
.btn:active:not(:disabled) { transform: scale(0.97); }
.btn:disabled { opacity: 0.45; cursor: default; }

.card.cobalt .btn { background: var(--cobalt); }
.card.teal .btn { background: var(--teal-deep); }
.card.terracotta .btn { background: var(--terracotta); }
.card.verde .btn { background: var(--verde); }

.btn-outline {
  background: transparent;
  color: var(--cobalt);
  border: 2px solid var(--cobalt);
  padding: 8px 22px;
}
.btn-outline:hover:not(:disabled) { background: var(--cobalt); color: var(--cream-soft); filter: none; }

.progress { display: flex; align-items: center; gap: 10px; }
.progress .bar {
  flex: 1;
  height: 10px;
  border-radius: 999px;
  background: rgba(29, 78, 158, 0.12);
  overflow: hidden;
  position: relative;
}
.progress .bar::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--p, 0%);
  border-radius: 999px;
  background: linear-gradient(90deg, var(--teal), var(--cobalt));
  transition: width 0.2s ease;
}
.progress .ptext { font-size: 0.8rem; font-weight: 600; color: var(--ink-soft); min-width: 8ch; }
.status-line { font-size: 0.85rem; line-height: 1.4; margin: 0; color: var(--ink-soft); }
.status-line.ok { color: var(--verde-deep); font-weight: 600; }
.status-line.err { color: var(--terracotta-deep); font-weight: 600; }

/* ---------- local flash ---------- */

.local { margin-top: 38px; }
.local summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--cobalt);
  padding: 12px 4px;
}
.local-body {
  background: var(--cream-soft);
  border: 1.5px solid var(--line);
  border-radius: 16px;
  padding: 18px 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}
.local-body p { flex-basis: 100%; margin: 0; color: var(--ink-soft); font-size: 0.9rem; }
.file-btn { position: relative; overflow: hidden; display: inline-block; }
.file-btn input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
#local-name { font-size: 0.88rem; color: var(--ink-soft); }
#local-progress { flex-basis: 100%; }

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

footer { margin-top: 30px; }
.tiles-divider {
  height: 50px;
  background: url("border.svg") center top repeat-x;
  background-size: 200px 44px;
  border-top: 3px solid var(--cobalt);
  border-bottom: 3px solid var(--cobalt);
}
footer p {
  text-align: center;
  font-size: 0.85rem;
  color: var(--ink-soft);
  padding: 22px 16px 30px;
  margin: 0;
}
footer a { color: var(--cobalt); text-decoration: none; font-weight: 600; }
footer a:hover { text-decoration: underline; }

@media (max-width: 560px) {
  .plaque { padding: 32px 22px 28px; }
  .hero { padding: 40px 16px 64px; }
  main { padding: 30px 16px 40px; }
}