@import url("https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&family=IBM+Plex+Mono:wght@400;500&display=swap");

:root {
  color-scheme: dark;
  --bg: #101012;
  --bg-elevated: rgba(24, 24, 28, 0.76);
  --bg-elevated-strong: rgba(28, 28, 34, 0.92);
  --surface: rgba(255, 255, 255, 0.04);
  --surface-strong: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(255, 122, 0, 0.22);
  --text: #f4f1ed;
  --muted: #aaa29a;
  --accent: #ff7a00;
  --accent-soft: #ff9f52;
  --accent-wash: rgba(255, 122, 0, 0.14);
  --ok: #6dffb1;
  --warn: #ffca57;
  --danger: #ff715b;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.36);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Manrope", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top center, rgba(255, 122, 0, 0.16), transparent 22%),
    radial-gradient(circle at 85% 15%, rgba(255, 122, 0, 0.09), transparent 16%),
    linear-gradient(180deg, #0f0f11 0%, #131316 48%, #101012 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.88), transparent 92%);
  pointer-events: none;
}

body::after {
  content: "";
  position: fixed;
  inset: auto 7% 5% auto;
  width: 24rem;
  height: 24rem;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(255, 122, 0, 0.12), transparent 70%);
  filter: blur(40px);
  pointer-events: none;
}

.shell {
  width: min(1160px, calc(100vw - 2rem));
  margin: 0 auto;
  padding: 1.5rem 0 3rem;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 2rem;
  border-radius: 32px;
  border: 1px solid var(--border-accent);
  background:
    linear-gradient(135deg, rgba(255, 122, 0, 0.08), transparent 28%),
    linear-gradient(180deg, rgba(34, 34, 40, 0.9), rgba(20, 20, 24, 0.84));
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, rgba(255, 122, 0, 0.8), transparent 55%);
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto -5rem -5rem auto;
  width: 16rem;
  height: 16rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 0, 0.16), transparent 72%);
}

.eyebrow,
.label {
  margin: 0 0 0.6rem;
  color: var(--accent-soft);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  max-width: 11ch;
  font-size: clamp(2.6rem, 7vw, 4.9rem);
  line-height: 0.92;
  letter-spacing: -0.05em;
}

.lede,
.hint,
.stats dt,
.field span {
  color: var(--muted);
}

.lede {
  max-width: 40rem;
  margin-top: 0.95rem;
  font-size: 1.02rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.6rem;
}

.action-feedback {
  margin-top: 1rem;
  padding: 0.9rem 1rem;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.045);
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.45;
}

.action-feedback.hidden {
  display: none;
}

.action-feedback.ok {
  border-color: rgba(109, 255, 177, 0.3);
  background: rgba(109, 255, 177, 0.12);
  color: #dfffee;
}

.action-feedback.warn {
  border-color: rgba(255, 122, 0, 0.34);
  background: rgba(255, 122, 0, 0.14);
  color: #ffe3c8;
}

.action-feedback.error {
  border-color: rgba(255, 113, 91, 0.34);
  background: rgba(255, 113, 91, 0.14);
  color: #ffd9d3;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.panel {
  position: relative;
  overflow: hidden;
  padding: 1.35rem;
  border-radius: 24px;
  border: 1px solid var(--border);
  background:
    linear-gradient(180deg, rgba(31, 31, 37, 0.84), rgba(20, 20, 24, 0.88));
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}

.panel::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
  pointer-events: none;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(145px, 1fr));
  gap: 0.85rem;
  margin: 0;
}

.stats div {
  padding: 1rem;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.02));
}

.stats dt {
  margin-bottom: 0.4rem;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.stats dd {
  margin: 0;
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
  padding: 0.36rem 0.82rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.05);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.pill.ok {
  color: #032012;
  background: var(--ok);
  border-color: transparent;
}

.pill.warn {
  color: #332100;
  background: var(--warn);
  border-color: transparent;
}

.pill.error {
  color: #44110c;
  background: var(--danger);
  border-color: transparent;
}

.pill.idle {
  color: var(--text);
}

button {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 16px;
  padding: 0.92rem 1.2rem;
  font: inherit;
  font-weight: 800;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition:
    transform 140ms ease,
    opacity 140ms ease,
    border-color 140ms ease,
    background-color 140ms ease,
    box-shadow 140ms ease;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.primary {
  color: #221100;
  background: linear-gradient(180deg, #ff9d48, var(--accent));
  box-shadow: 0 10px 28px rgba(255, 122, 0, 0.22);
}

.ghost {
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.08);
}

.config-form {
  display: grid;
  gap: 0.85rem;
}

.ota-actions {
  display: grid;
  gap: 0.85rem;
  margin-top: 0.4rem;
}

.panel-wide {
  grid-column: 1 / -1;
}

.serial-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.serial-output {
  margin: 1rem 0 0;
  min-height: 280px;
  max-height: 420px;
  overflow: auto;
  padding: 1rem;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background:
    linear-gradient(180deg, rgba(14, 14, 16, 0.96), rgba(20, 20, 24, 0.98));
  color: #ffd5b2;
  font: 0.84rem/1.5 "IBM Plex Mono", "Cascadia Code", monospace;
  white-space: pre-wrap;
  word-break: break-word;
}

.toggle,
.field {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.95rem 1rem;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.02));
}

.field {
  display: grid;
  gap: 0.45rem;
}

.toggle input {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--accent);
}

.field span {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.field select {
  width: 100%;
  padding: 0.82rem 0.92rem;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font: inherit;
}

@media (max-width: 640px) {
  .shell {
    width: min(100vw - 1rem, 1160px);
    padding-top: 0.8rem;
  }

  .hero {
    padding: 1.5rem;
    border-radius: 24px;
  }

  .panel {
    border-radius: 20px;
  }

  h1 {
    max-width: none;
    font-size: clamp(2.2rem, 10vw, 3.4rem);
  }
}