:root {
  color-scheme: light dark;
  font-family: "Inter", "SF Pro Display", "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --bg-gradient-start: rgba(64, 85, 245, 0.55);
  --bg-gradient-end: rgba(150, 201, 255, 0.45);
  --bg-gradient-secondary: rgba(255, 183, 197, 0.45);
  --panel-bg: rgba(255, 255, 255, 0.55);
  --panel-bg-dark: rgba(22, 22, 28, 0.55);
  --border-color: rgba(255, 255, 255, 0.3);
  --text-primary: rgba(22, 22, 28, 0.9);
  --text-secondary: rgba(22, 22, 28, 0.65);
  --text-inverse: rgba(255, 255, 255, 0.96);
  --shadow-soft: 0 24px 48px rgba(20, 25, 40, 0.18);
  --radius-large: 28px;
  --radius-medium: 20px;
  --radius-small: 14px;
  --transition: 180ms ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    --panel-bg: rgba(32, 32, 42, 0.58);
    --panel-bg-dark: rgba(22, 22, 28, 0.8);
    --border-color: rgba(255, 255, 255, 0.08);
    --text-primary: rgba(255, 255, 255, 0.95);
    --text-secondary: rgba(255, 255, 255, 0.7);
    --shadow-soft: 0 30px 60px rgba(0, 0, 0, 0.4);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top left, var(--bg-gradient-start), transparent 55%),
              radial-gradient(circle at bottom right, var(--bg-gradient-secondary), transparent 50%),
              linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(245, 247, 255, 0.9));
  color: var(--text-primary);
  display: flex;
  justify-content: center;
  padding: 48px 20px 64px;
}

.app-shell {
  max-width: 1120px;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.app-header {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 28px;
}

.app-header__content {
  display: flex;
  align-items: center;
  gap: 20px;
}

.app-header h1 {
  margin: 0 0 4px;
  font-size: clamp(1.8rem, 2.6vw, 2.4rem);
  font-weight: 700;
}

.app-header p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 1rem;
}

.app-icon {
  width: 72px;
  height: 72px;
  border-radius: 24px;
  display: grid;
  place-items: center;
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-inverse);
  background: linear-gradient(135deg, #5d7bff, #a276ff);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3), 0 20px 35px rgba(93, 123, 255, 0.35);
}

.glass-panel {
  position: relative;
  border-radius: var(--radius-large);
  background: var(--panel-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-soft);
}

.section-grid {
  display: grid;
  gap: 28px;
}

.result-panel {
  padding: 28px;
}

.panel-header h2 {
  margin: 0;
  font-size: 1.4rem;
  font-weight: 600;
}

.panel-header p {
  margin: 6px 0 0;
  color: var(--text-secondary);
  line-height: 1.5;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.result-tile {
  padding: 18px;
  background: rgba(255, 255, 255, 0.7);
  border-radius: var(--radius-medium);
  border: 1px solid rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform var(--transition), box-shadow var(--transition);
}

@media (prefers-color-scheme: dark) {
  .result-tile {
    background: rgba(32, 32, 42, 0.65);
    border-color: rgba(255, 255, 255, 0.08);
  }
}

.result-tile:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 36px rgba(60, 80, 130, 0.25);
}

.result-tile__label {
  margin: 0 0 6px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.result-tile__value {
  margin: 0;
  font-size: 1.8rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.form-panel {
  padding: 28px;
}

.form-fields {
  display: grid;
  gap: 18px;
}

.input-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-weight: 500;
}

.input-field__control {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.75);
  border-radius: var(--radius-small);
  border: 1px solid rgba(255, 255, 255, 0.4);
  transition: border-color var(--transition), box-shadow var(--transition);
}

@media (prefers-color-scheme: dark) {
  .input-field__control {
    background: rgba(32, 32, 42, 0.75);
    border-color: rgba(255, 255, 255, 0.1);
  }
}

.input-field__control:focus-within {
  border-color: rgba(93, 123, 255, 0.65);
  box-shadow: 0 0 0 4px rgba(93, 123, 255, 0.18);
}

.input-field__label {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.input-field__unit {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 600;
}

input[type="text"] {
  font: inherit;
  border: none;
  background: transparent;
  outline: none;
  padding: 0;
  color: inherit;
}

.form-actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  border: none;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 600;
  padding: 14px 24px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.button:focus-visible {
  outline: 3px solid rgba(93, 123, 255, 0.35);
  outline-offset: 2px;
}

.button--primary {
  background: linear-gradient(135deg, #5670ff, #8b6dff);
  color: var(--text-inverse);
  box-shadow: 0 18px 36px rgba(86, 112, 255, 0.35);
}

.button--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 22px 42px rgba(86, 112, 255, 0.45);
}

.button--secondary {
  background: rgba(255, 255, 255, 0.65);
  color: var(--text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.4);
}

@media (prefers-color-scheme: dark) {
  .button--secondary {
    background: rgba(32, 32, 42, 0.7);
    border-color: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.85);
  }
}

.button--secondary:hover {
  transform: translateY(-1px);
}

.button__icon {
  font-size: 1.1rem;
}

.form-message {
  margin-top: 18px;
  min-height: 1.4em;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.form-message.is-error {
  color: #d12f4a;
}

.segmented-control {
  display: inline-flex;
  padding: 4px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.35);
  gap: 6px;
  width: fit-content;
}

.segmented-control--compact {
  align-self: flex-start;
}

@media (prefers-color-scheme: dark) {
  .segmented-control {
    background: rgba(32, 32, 42, 0.6);
    border-color: rgba(255, 255, 255, 0.1);
  }
}

.segmented-control__button {
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-weight: 600;
  padding: 10px 18px;
  border-radius: 999px;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.segmented-control__button.is-active {
  background: linear-gradient(135deg, rgba(93, 123, 255, 0.9), rgba(136, 109, 255, 0.85));
  color: var(--text-inverse);
  box-shadow: 0 12px 24px rgba(93, 123, 255, 0.35);
}

.segmented-control__button:hover {
  transform: translateY(-1px);
}

.app-section.is-hidden {
  display: none;
}

/* Resistor layout */
.resistor-header,
.resistor-summary,
.resistor-controls,
.resistor-illustration {
  padding: 28px;
}

.swipe-hint {
  display: flex;
  gap: 16px;
  align-items: center;
  padding: 16px 18px;
  border-radius: var(--radius-medium);
  background: rgba(93, 123, 255, 0.12);
  border: 1px solid rgba(93, 123, 255, 0.28);
  margin-bottom: 24px;
}

.swipe-hint__icon {
  width: 40px;
  height: 40px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-size: 1.35rem;
  font-weight: 700;
  color: #5d7bff;
  background: rgba(93, 123, 255, 0.18);
}

.swipe-hint__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.swipe-hint__body {
  margin: 2px 0 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.resistor-display {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0;
}

.resistor-lead {
  height: 18px;
  width: 64px;
  background: linear-gradient(90deg, rgba(160, 160, 165, 0.9), rgba(120, 120, 130, 0.9));
  border-radius: 6px;
}

.resistor-body {
  position: relative;
  height: 140px;
  border-radius: 36px;
  background: linear-gradient(135deg, rgba(255, 247, 236, 0.92), rgba(244, 216, 170, 0.92));
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.05), inset 0 -8px 18px rgba(0, 0, 0, 0.08);
  display: flex;
  align-items: center;
  padding: 0 32px;
}

.resistor-bands {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  gap: clamp(12px, 3vw, 24px);
}

.resistor-band {
  flex: 1;
  max-width: 90px;
  height: 110px;
  border-radius: 10px;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  box-shadow: 0 14px 24px rgba(30, 30, 40, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.3);
  transition: transform var(--transition), box-shadow var(--transition);
}

.resistor-band:hover,
.resistor-band:focus-visible {
  transform: translateY(-3px);
  box-shadow: 0 18px 32px rgba(30, 30, 40, 0.32);
}

.resistor-band::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.3), transparent 40%, transparent 60%, rgba(0, 0, 0, 0.2));
  mix-blend-mode: soft-light;
  pointer-events: none;
}

.summary-values {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 18px;
}

.summary-value__label {
  margin: 0 0 8px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.summary-value__value {
  margin: 0;
  font-size: 1.6rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.summary-chips {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.4);
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

@media (prefers-color-scheme: dark) {
  .chip {
    background: rgba(32, 32, 42, 0.7);
    border-color: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.85);
  }
}

.band-form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 22px;
}

.band-picker label {
  display: block;
  margin-bottom: 10px;
  font-weight: 600;
}

.band-picker__control {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-small);
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.4);
}

@media (prefers-color-scheme: dark) {
  .band-picker__control {
    background: rgba(32, 32, 42, 0.75);
    border-color: rgba(255, 255, 255, 0.1);
  }
}

.band-color {
  width: 40px;
  height: 20px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.12);
}

select {
  appearance: none;
  -webkit-appearance: none;
  border: none;
  background: transparent;
  font: inherit;
  color: inherit;
  padding-right: 24px;
}

select:focus {
  outline: none;
}

.band-picker.is-hidden,
.chip.is-hidden {
  display: none;
}

@media (max-width: 900px) {
  body {
    padding: 32px 16px 48px;
  }

  .app-shell {
    gap: 24px;
  }

  .glass-panel {
    border-radius: 22px;
  }

  .resistor-body {
    height: 120px;
  }

  .resistor-band {
    height: 96px;
  }
}

@media (max-width: 640px) {
  body {
    padding: 24px 14px 36px;
  }

  .app-header {
    padding: 22px;
  }

  .app-header__content {
    flex-direction: column;
    text-align: center;
  }

  .segmented-control {
    width: 100%;
    justify-content: space-between;
  }

  .form-panel,
  .result-panel,
  .resistor-header,
  .resistor-summary,
  .resistor-controls,
  .resistor-illustration {
    padding: 22px;
  }

  .resistor-display {
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 18px;
  }

  .resistor-lead {
    width: 48px;
    height: 14px;
  }

  .resistor-body {
    width: 100%;
    padding: 0 24px;
  }
}