:root {
  color-scheme: dark;
  --bg: #0f1014;
  --bg-accent: #171922;
  --panel: rgba(22, 25, 33, 0.82);
  --panel-border: rgba(255, 255, 255, 0.08);
  --text: #f4efe7;
  --muted: #b5ad9f;
  --accent: #d9a55c;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  --radius-xl: 30px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --font-display: "Space Grotesk", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-display);
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(220, 171, 110, 0.16), transparent 28%),
    radial-gradient(circle at right 20%, rgba(95, 124, 211, 0.11), transparent 24%),
    linear-gradient(145deg, var(--bg), var(--bg-accent));
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, 0.15) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.15) 1px, transparent 1px);
  background-size: 52px 52px;
  mask-image: radial-gradient(circle at center, black, transparent 88%);
  opacity: 0.08;
}

.shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 40px 0 56px;
}

.hero {
  max-width: 760px;
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 12px;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--accent);
  font: 600 0.8rem var(--font-mono);
}

h1 {
  margin: 0;
  font-size: clamp(2.6rem, 5vw, 4.8rem);
  line-height: 0.95;
  letter-spacing: -0.05em;
}

.lead {
  margin: 16px 0 0;
  max-width: 66ch;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

.panel {
  border: 1px solid var(--panel-border);
  background: var(--panel);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.app {
  padding: 20px;
}

.app-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 20px;
}

.controls,
.results {
  display: grid;
  gap: 16px;
}

.field,
.help-card,
.readout-card {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.03);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.18);
}

.field {
  padding: 16px;
}

.field span,
.help-card h2,
.readout-label {
  display: block;
  margin-bottom: 10px;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

select {
  width: 100%;
  margin: 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 14px;
  padding: 14px 16px;
  font: 600 1rem var(--font-display);
  color: var(--text);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  outline: none;
}

select:focus {
  border-color: rgba(217, 165, 92, 0.65);
  box-shadow: 0 0 0 4px rgba(217, 165, 92, 0.16);
}

.band-controls {
  display: grid;
  gap: 12px;
}

.band-group {
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.03);
}

.band-group-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
  margin-bottom: 10px;
}

.band-group h2 {
  margin: 0;
  font-size: 1rem;
}

.band-hint {
  color: var(--muted);
  font: 500 0.82rem var(--font-mono);
}

.band-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
}

.band-option {
  position: relative;
}

.band-option label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font: 600 0.8rem var(--font-mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.band-option select {
  padding-left: 14px;
}

.help-card,
.readout-card {
  padding: 18px;
}

.help-card h2 {
  margin-top: 0;
}

.help-card p,
.readout-detail {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.resistor-stage {
  display: grid;
  gap: 12px;
  padding: 18px;
  border-radius: var(--radius-lg);
  border: 1px dashed rgba(255, 255, 255, 0.14);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02));
}

.resistor {
  --body-color: #d8b47b;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 220px;
  padding: 28px 10px;
}

.resistor-track {
  position: relative;
  width: min(420px, 100%);
  height: 92px;
}

.resistor-lead {
  position: absolute;
  top: 50%;
  width: 78px;
  height: 6px;
  margin-top: -3px;
  background: linear-gradient(90deg, #7d6f58, #c2b39a);
  border-radius: 999px;
}

.resistor-lead.left {
  left: 0;
}

.resistor-lead.right {
  right: 0;
}

.resistor-body {
  position: absolute;
  left: 50%;
  top: 50%;
  width: calc(100% - 132px);
  height: 92px;
  transform: translate(-50%, -50%);
  border-radius: 999px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.45), transparent 22%, transparent 78%, rgba(58, 31, 0, 0.12)),
    var(--body-color);
  box-shadow:
    inset 0 14px 18px rgba(255, 255, 255, 0.22),
    inset 0 -16px 22px rgba(94, 57, 17, 0.18),
    0 18px 28px rgba(56, 34, 10, 0.16);
}

.resistor-body::before,
.resistor-body::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 24px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.12), rgba(0, 0, 0, 0.08));
}

.resistor-body::before {
  left: 0;
  border-radius: 999px 0 0 999px;
}

.resistor-body::after {
  right: 0;
  border-radius: 0 999px 999px 0;
}

.band {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  height: 100%;
  width: 18px;
  border-radius: 10px;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.08);
}

.band.first::after {
  content: "1";
  position: absolute;
  top: -26px;
  left: 50%;
  transform: translateX(-50%);
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 999px;
  background: #f0d7ae;
  color: #17130d;
  font: 700 0.8rem var(--font-mono);
}

.band-label {
  position: absolute;
  top: -42px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--muted);
  font: 700 0.72rem var(--font-mono);
  text-transform: uppercase;
  white-space: nowrap;
}

.tolerance-band {
  width: 24px;
}

.stage-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

.readout-value {
  font: 700 clamp(2rem, 4vw, 3rem) var(--font-mono);
  letter-spacing: -0.05em;
}

.muted {
  background: rgba(255, 255, 255, 0.03);
}

@media (max-width: 900px) {
  .app-grid {
    grid-template-columns: 1fr;
  }

  .resistor-track {
    width: min(100%, 420px);
  }
}

@media (max-width: 640px) {
  .shell {
    width: min(100% - 20px, 1120px);
    padding-top: 18px;
  }

  .app {
    padding: 14px;
  }

  .resistor {
    min-height: 180px;
  }

  .resistor-body {
    width: calc(100% - 98px);
    height: 76px;
  }

  .resistor-lead {
    width: 54px;
  }
}