/* AWS Console Inspired Dark Theme */
:root {
  /* AWS Color Palette */
  --aws-dark-bg: #0f1419;
  --aws-darker-bg: #0d1116;
  --aws-card-bg: #161b22;
  --aws-border-color: #30363d;
  --aws-hover-border: #58a6ff;
  --aws-glow-primary: #58a6ff;
  --aws-glow-secondary: #39d353;
  --aws-glow-warning: #f85149;
  --aws-text-primary: #f0f6fc;
  --aws-text-secondary: #8b949e;
  --aws-text-muted: #6e7681;
  --aws-accent-orange: #fb8500;
  --aws-accent-blue: #0969da;
  --aws-accent-green: #1a7f37;
  --aws-table-stripe: #21262d;

  /* Shadows and Glows */
  --glow-primary: 0 0 10px rgba(88, 166, 255, 0.3);
  --glow-secondary: 0 0 8px rgba(57, 211, 83, 0.25);
  --glow-warning: 0 0 8px rgba(248, 81, 73, 0.25);
  --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-elevated: 0 16px 48px rgba(0, 0, 0, 0.6);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, var(--aws-darker-bg) 0%, var(--aws-dark-bg) 100%);
  color: var(--aws-text-primary);
  min-height: 100vh;
  line-height: 1.6;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px;
}

/* Header Styles */
.header {
  text-align: center;
  margin-bottom: 40px;
  padding: 32px 0;
  border-bottom: 2px solid var(--aws-border-color);
  background: linear-gradient(135deg, var(--aws-card-bg) 0%, rgba(22, 27, 34, 0.8) 100%);
  border-radius: 12px;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--aws-border-color);
}

.header-title {
  font-size: 2.5em;
  font-weight: 300;
  color: var(--aws-text-primary);
  margin-bottom: 8px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.header-subtitle {
  font-size: 1.1em;
  color: var(--aws-text-secondary);
  font-weight: 400;
}

/* Section Styles */
.config-section,
.conversion-section,
.table-section {
  background: var(--aws-card-bg);
  border-radius: 12px;
  padding: 32px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--aws-border-color);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.config-section::before,
.conversion-section::before,
.table-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--aws-glow-primary), var(--aws-accent-orange), var(--aws-glow-secondary));
  opacity: 0.7;
}

.config-section:hover,
.conversion-section:hover,
.table-section:hover {
  border-color: var(--aws-hover-border);
  box-shadow: var(--shadow-elevated), var(--glow-primary);
  transform: translateY(-2px);
}

/* Configuration Title */
.config-title {
  font-size: 1.4em;
  font-weight: 600;
  color: var(--aws-text-primary);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--aws-border-color);
}

.config-icon {
  font-size: 1.2em;
  filter: drop-shadow(0 0 4px var(--aws-glow-primary));
}

/* Preset Buttons */
.preset-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.preset-btn {
  background: linear-gradient(135deg, var(--aws-accent-blue), #0550ae);
  color: var(--aws-text-primary);
  border: 1px solid var(--aws-border-color);
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 0.9em;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.preset-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left 0.5s ease;
}

.preset-btn:hover {
  background: linear-gradient(135deg, #0969da, var(--aws-accent-blue));
  border-color: var(--aws-hover-border);
  box-shadow: var(--glow-primary);
  transform: translateY(-2px);
}

.preset-btn:hover::before {
  left: 100%;
}

.preset-btn:active {
  transform: translateY(0);
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* Unit Configuration */
.unit-config {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 24px;
}

.unit-card {
  background: var(--aws-darker-bg);
  border-radius: 8px;
  padding: 20px;
  border: 1px solid var(--aws-border-color);
  transition: all 0.3s ease;
}

.unit-card:hover {
  border-color: var(--aws-hover-border);
  box-shadow: var(--glow-primary);
}

/* Grid Layout */
.config-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

/* Signal Range Groups */
.signal-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-top: 16px;
}

.signal-group {
  background: var(--aws-darker-bg);
  border: 2px solid var(--aws-border-color);
  border-radius: 12px;
  padding: 20px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.signal-group::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  opacity: 0.8;
  transition: all 0.3s ease;
}

.signal-group.current-group::before {
  background: linear-gradient(90deg, var(--aws-glow-primary), #0969da);
}

.signal-group.voltage-group::before {
  background: linear-gradient(90deg, var(--aws-accent-orange), #fd7e14);
}

.signal-group.measurement-group::before {
  background: linear-gradient(90deg, var(--aws-glow-secondary), var(--aws-accent-green));
}

.signal-group:hover {
  border-color: var(--aws-hover-border);
  box-shadow: var(--glow-primary);
  transform: translateY(-2px);
}

.signal-group-title {
  font-size: 1.1em;
  font-weight: 600;
  color: var(--aws-text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--aws-border-color);
}

.signal-group-icon {
  font-size: 1.2em;
  filter: drop-shadow(0 0 4px currentColor);
}

.signal-group-subtitle {
  font-size: 0.85em;
  color: var(--aws-text-muted);
  font-weight: 400;
  margin-left: auto;
}

.signal-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.signal-inputs .input-group {
  min-width: 0; /* Allow flex items to shrink */
}

.signal-inputs .form-input {
  width: 100%;
  min-width: 120px; /* Ensure consistent minimum width */
  max-width: none; /* Remove any width restrictions */
}

.conversion-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-top: 24px;
}

/* Form Elements */
.input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-weight: 500;
  color: var(--aws-text-secondary);
  font-size: 0.9em;
  letter-spacing: 0.5px;
}

.form-input {
  padding: 12px 16px;
  border: 2px solid var(--aws-border-color);
  border-radius: 8px;
  background: var(--aws-darker-bg);
  color: var(--aws-text-primary);
  font-size: 1em;
  font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
  transition: all 0.3s ease;
  outline: none;
}

.form-input:focus {
  border-color: var(--aws-glow-primary);
  box-shadow: var(--glow-primary);
  background: var(--aws-card-bg);
  transform: translateY(-1px);
}

.form-input:hover:not(:focus) {
  border-color: var(--aws-hover-border);
}

.unit-symbol-input {
  margin-top: 12px;
}

.unit-display {
  color: var(--aws-glow-primary);
  font-weight: 600;
  text-shadow: 0 0 4px var(--aws-glow-primary);
}

/* Converter Cards */
.converter-card {
  background: var(--aws-darker-bg);
  border-radius: 12px;
  border: 2px solid var(--aws-border-color);
  transition: all 0.3s ease;
  overflow: hidden;
  position: relative;
}

.converter-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--aws-glow-primary), var(--aws-glow-secondary));
  opacity: 0.8;
}

.converter-card:hover {
  border-color: var(--aws-glow-primary);
  box-shadow: var(--glow-primary);
  transform: translateY(-4px);
}

.converter-header {
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--aws-border-color);
  background: linear-gradient(135deg, var(--aws-card-bg), var(--aws-darker-bg));
}

.converter-title {
  font-weight: 600;
  color: var(--aws-text-primary);
  font-size: 1.1em;
  margin-bottom: 4px;
}

.converter-subtitle {
  color: var(--aws-text-muted);
  font-size: 0.85em;
  font-weight: 400;
}

.converter-body {
  padding: 20px;
}

.converter-input {
  font-size: 1.1em;
  font-weight: 600;
  text-align: center;
}

.result-group {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.result {
  background: linear-gradient(135deg, var(--aws-accent-green), #1a7f37);
  border-radius: 8px;
  padding: 12px 16px;
  font-weight: 600;
  color: var(--aws-text-primary);
  text-align: center;
  border: 1px solid var(--aws-glow-secondary);
  box-shadow: var(--glow-secondary);
  font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
  font-size: 0.95em;
}

/* Table Styles */
.table-controls {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
  align-items: center;
}

.btn-generate,
.btn-export {
  background: linear-gradient(135deg, var(--aws-accent-orange), #d63384);
  color: var(--aws-text-primary);
  border: 2px solid var(--aws-border-color);
  padding: 14px 24px;
  border-radius: 8px;
  font-size: 1em;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
  position: relative;
  overflow: hidden;
}

.btn-generate:hover,
.btn-export:hover {
  background: linear-gradient(135deg, #fd7e14, var(--aws-accent-orange));
  border-color: var(--aws-glow-primary);
  box-shadow: var(--glow-primary);
  transform: translateY(-2px);
}

.btn-icon {
  font-size: 1.1em;
}

.table-container {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--aws-border-color);
  box-shadow: var(--shadow-card);
}

.calibration-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--aws-darker-bg);
}

.calibration-table th {
  background: linear-gradient(135deg, var(--aws-accent-blue), #0550ae);
  color: var(--aws-text-primary);
  padding: 16px 12px;
  text-align: center;
  font-weight: 600;
  font-size: 0.9em;
  letter-spacing: 0.5px;
  border-bottom: 2px solid var(--aws-border-color);
  position: relative;
}

.calibration-table th::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--aws-glow-primary);
  opacity: 0.6;
}

.calibration-table td {
  padding: 14px 12px;
  text-align: center;
  border-bottom: 1px solid var(--aws-border-color);
  font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
  font-size: 0.9em;
  color: var(--aws-text-secondary);
  transition: all 0.2s ease;
}

.calibration-table tbody tr {
  background: var(--aws-darker-bg);
  transition: all 0.3s ease;
}

.calibration-table tbody tr:nth-child(even) {
  background: var(--aws-table-stripe);
}

.calibration-table tbody tr:hover {
  background: linear-gradient(135deg, rgba(88, 166, 255, 0.1), rgba(57, 211, 83, 0.05));
  transform: translateX(4px);
  box-shadow: inset 4px 0 0 var(--aws-glow-primary);
}

.calibration-table tbody tr:hover td {
  color: var(--aws-text-primary);
}

/* Footer */
.footer {
  margin-top: 48px;
  padding: 32px 0;
  border-top: 1px solid var(--aws-border-color);
}

.footer-content {
  max-width: 800px;
  margin: 0 auto;
}

.usage-tips {
  background: var(--aws-card-bg);
  border-radius: 12px;
  padding: 24px;
  border-left: 4px solid var(--aws-glow-primary);
  box-shadow: var(--shadow-card);
}

.usage-tips h3 {
  color: var(--aws-text-primary);
  margin-bottom: 16px;
  font-size: 1.2em;
}

.usage-tips ul {
  list-style: none;
  padding: 0;
}

.usage-tips li {
  color: var(--aws-text-secondary);
  margin-bottom: 8px;
  padding-left: 20px;
  position: relative;
  line-height: 1.6;
}

.usage-tips li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--aws-glow-primary);
  font-weight: bold;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 16px;
  }

  .config-section,
  .conversion-section,
  .table-section {
    padding: 20px;
    margin-bottom: 20px;
  }

  .header-title {
    font-size: 2em;
  }

  .conversion-grid {
    grid-template-columns: 1fr;
  }

  .preset-buttons {
    grid-template-columns: 1fr;
  }

  .table-container {
    overflow-x: auto;
  }

  .calibration-table {
    min-width: 600px;
  }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--aws-darker-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--aws-border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--aws-text-muted);
}

/* Animation Keyframes */
@keyframes glow-pulse {
  0%, 100% {
    box-shadow: var(--glow-primary);
  }
  50% {
    box-shadow: 0 0 20px rgba(88, 166, 255, 0.6);
  }
}

.converter-card:focus-within {
  animation: glow-pulse 2s ease-in-out infinite;
}