:root {
  color-scheme: light;
  --bg-color: #f5f7fa;
  --text-color: #222;
  --muted-text-color: #555;
  --strong-text-color: #333;
  --container-width: 900px;
  --surface-color: #ffffff;
  --surface-muted: #f9fbfd;
  --surface-soft: #f8fbfe;
  --surface-strong: #e3edf8;
  --border-color: #ccc;
  --border-strong: #c7d2df;
  --input-bg: #ffffff;
  --accent-color: #0078d4;
  --accent-hover: #005fa3;
  --accent-ring: rgba(0, 120, 212, 0.2);
  --result-accent: #0078d4;
  --equation-bg: #f9f9f9;
  --equation-text: #c7254e;
  --shadow-soft: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-card: 0 2px 4px rgba(0, 0, 0, 0.05);
}

:root[data-theme='dark'] {
  color-scheme: dark;
  --bg-color: #111827;
  --text-color: #e5edf7;
  --muted-text-color: #b2bfd0;
  --strong-text-color: #f4f7fb;
  --surface-color: #17212b;
  --surface-muted: #1b2834;
  --surface-soft: #18242f;
  --surface-strong: #223242;
  --border-color: #304255;
  --border-strong: #3b4f63;
  --input-bg: #0f1822;
  --accent-color: #67b3ff;
  --accent-hover: #8cc4ff;
  --accent-ring: rgba(103, 179, 255, 0.28);
  --result-accent: #8cc4ff;
  --equation-bg: #0f1822;
  --equation-text: #ff9ab3;
  --shadow-soft: 0 1px 2px rgba(0, 0, 0, 0.28);
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.25);
}

/* Base styles */
body {
  font-family: Arial, Helvetica, sans-serif;
  margin: 0;
  padding: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.4;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.container {
  max-width: var(--container-width);
  margin: 40px auto;
  padding: 0 20px;
}

.page-toolbar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 16px;
}

.theme-toggle {
  padding: 8px 12px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--surface-color);
  color: var(--text-color);
  font: inherit;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.theme-toggle:hover {
  border-color: var(--accent-color);
  color: var(--accent-color);
}

.theme-toggle:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-ring);
}

h1 {
  text-align: center;
  margin-bottom: 10px;
}

p {
  color: var(--muted-text-color);
  margin-top: 0;
  margin-bottom: 30px;
  text-align: center;
}

code {
  color: var(--strong-text-color);
}

/* Form styles */
.form-group {
  margin-bottom: 15px;
  display: flex;
  flex-direction: column;
}

.form-group label {
  margin-bottom: 4px;
  font-weight: bold;
}

.group-label {
  margin-bottom: 8px;
  font-weight: bold;
  color: var(--strong-text-color);
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 8px 10px;
  font-size: 16px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--input-bg);
  color: var(--text-color);
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--muted-text-color);
}

.single-gpu-label {
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: normal;
}

.form-group.is-disabled {
  opacity: 0.45;
}

.form-group.is-disabled label {
  color: var(--muted-text-color);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent-color);
  outline: none;
  box-shadow: 0 0 0 2px var(--accent-ring);
}

.form-row {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.form-row .form-group {
  flex: 1 1 200px;
}

.quantization-group {
  margin-top: 8px;
  padding: 14px;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background-color: var(--surface-muted);
}

.quantization-row .form-group {
  flex: 1 1 180px;
  margin-bottom: 0;
}

.field-hint {
  margin-top: 10px;
  color: var(--muted-text-color);
  font-size: 0.92em;
}

.static-section {
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  margin-bottom: 25px;
  overflow: hidden;
  background: var(--surface-soft);
  box-shadow: var(--shadow-soft);
}

.static-section-header {
  width: 100%;
  display: block;
  box-sizing: border-box;
  padding: 12px 16px;
  margin: 0;
  border-bottom: 1px solid var(--border-strong);
  background: var(--surface-strong);
  color: var(--strong-text-color);
  font-weight: 700;
}

.static-section-body {
  padding-top: 11px;
  padding-bottom: 16px;
}

.static-section .form-row {
  padding-left: 16px;
  padding-right: 16px;
}

.static-section .form-group {
  padding-left: 16px;
  padding-right: 16px;
}

.static-section .form-row .form-group,
.static-section .quantization-row .form-group {
  padding-left: 0;
  padding-right: 0;
}

fieldset.fieldset {
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 15px;
  margin-bottom: 25px;
}

legend {
  font-weight: bold;
  padding: 0 10px;
  color: var(--strong-text-color);
}

/* Button styles */
button#calculate-btn {
  padding: 12px 20px;
  font-size: 16px;
  color: #fff;
  background-color: var(--accent-color);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  width: 100%;
  transition: background-color 0.2s ease-in-out;
}

button#calculate-btn:hover {
  background-color: var(--accent-hover);
}

/* Results styles */
.results {
  margin-top: 30px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 20px;
  background-color: var(--surface-color);
  box-shadow: var(--shadow-card);
}

.results.hidden {
  display: none;
}

.results h2 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 1.4em;
}

.results .equation {
  font-family: 'Courier New', monospace;
  background-color: var(--equation-bg);
  border-radius: 4px;
  padding: 5px 8px;
  display: inline-block;
  margin-bottom: 5px;
  color: var(--equation-text);
}

.results .result-row {
  margin-bottom: 15px;
}

.results .result-title {
  font-weight: bold;
  margin-bottom: 4px;
  display: block;
}

.results .result-value {
  color: var(--result-accent);
  font-size: 1.1em;
  margin-bottom: 4px;
}

.results .info-text {
  color: var(--muted-text-color);
  font-size: 0.9em;
  margin-bottom: 10px;
}

@media screen and (max-width: 600px) {
  .container {
    margin: 24px auto;
  }

  .page-toolbar {
    margin-bottom: 12px;
  }

  .form-row {
    flex-direction: column;
  }

  .layer-count-row {
    grid-template-columns: 1fr;
  }

  button#calculate-btn {
    width: 100%;
  }
}