:root {
  --bg-color: #f4f5f7;
  --card-bg: #ffffff;
  --text-primary: #1d1d1f;
  --text-secondary: #6e6e73;
  --accent-color: #5e6ad2;
  --accent-hover: #4f5ac0;
  --border-color: #d8dae5;
  --input-bg: #f0f1f4;
  --input-focus-ring: rgba(94, 106, 210, 0.18);
  --success-color: #2da44e;
  --danger-color: #cf222e;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #0d0d0d;
    --card-bg: #1a1a1c;
    --text-primary: #ececed;
    --text-secondary: #8b8b8e;
    --accent-color: #7b87db;
    --accent-hover: #6872c9;
    --border-color: #2e2e32;
    --input-bg: #242428;
    --input-focus-ring: rgba(123, 135, 219, 0.25);
    --success-color: #3fb950;
    --danger-color: #f85149;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  }
}

/* Label Icons */
.label-icon {
  font-size: 1em;
  line-height: 1;
  margin-right: 5px;
  vertical-align: middle;
  color: var(--accent-color);
  opacity: 0.65;
}

/* Output Labels */
.output-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family:
    -apple-system, BlinkMacSystemFont, "Outfit", "SF Pro Text", "Segoe UI",
    Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  overflow-y: auto;
}

/* Container */
.container {
  background: var(--card-bg);
  width: 100%;
  max-width: 800px;
  border-radius: 24px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  padding: 2.5rem;
  box-sizing: border-box;
  transition: all 0.3s ease;
}

header {
  text-align: center;
  margin-bottom: 2rem;
  flex-shrink: 0;
}

header h1 {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

/* Stepper Header */
.stepper-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  margin-bottom: 2rem;
}

.step-indicator {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--input-bg);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.3s ease;
}

.step-indicator.active {
  background: var(--accent-color);
  color: white;
  box-shadow: 0 4px 12px var(--input-focus-ring);
}

.step-indicator.completed {
  background: var(--success-color);
  color: white;
}

.step-line {
  height: 2px;
  width: 40px;
  background: var(--border-color);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.step-indicator.active + .step-line,
.step-indicator.completed + .step-line {
  background: var(--accent-color);
}

/* Tabs (Segmented Control) */
.tabs {
  display: inline-flex;
  background: var(--input-bg);
  padding: 4px;
  border-radius: 10px;
  margin: 0 auto;
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-primary);
  padding: 6px 24px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.tab-btn.active {
  background: var(--card-bg);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
  font-weight: 600;
}

@media (prefers-color-scheme: dark) {
  .tab-btn.active {
    background: #2c2c30;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
  }
}

/* Main Content Area */
main {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

#os-form {
  display: flex;
  flex-direction: column;
}

/* Steps */
.step {
  display: none;
  flex-direction: column;
  gap: 1.5rem;
  animation: fadeIn 0.4s ease forwards;
}

.step.active {
  display: flex;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Form Grid */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.input-group.full-width {
  grid-column: span 2;
}

label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 600;
  letter-spacing: 0.01em;
}

input[type="text"],
textarea,
select {
  background: var(--input-bg);
  border: 1px solid transparent;
  padding: 12px 16px;
  border-radius: 12px;
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: all 0.2s ease;
  font-family: inherit;
  width: 100%;
  box-sizing: border-box;
}

input[type="text"]::placeholder,
textarea::placeholder {
  color: var(--text-secondary);
}

input[type="text"]:focus,
textarea:focus,
select:focus {
  outline: none;
  background: var(--card-bg);
  border-color: var(--accent-color);
  box-shadow: 0 0 0 4px var(--input-focus-ring);
}

textarea {
  resize: vertical;
  min-height: 80px;
}

/* Radio Groups */
.radio-group-container {
  display: flex;
  flex-direction: column;
}

.radio-group,
.checkbox-group {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.radio-group label,
.checkbox-group label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  background: var(--card-bg);
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-primary);
  transition: all 0.2s ease;
  user-select: none;
}

.radio-group input[type="radio"],
.checkbox-group input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin: 0;
  accent-color: var(--accent-color);
  cursor: pointer;
}

.radio-group label:hover,
.checkbox-group label:hover {
  border-color: var(--text-secondary);
}

.radio-group label:has(input:checked),
.checkbox-group label:has(input:checked) {
  border-color: var(--accent-color);
  background: var(--input-focus-ring);
  color: var(--accent-color);
}

/* Status colors in radios */
label.status-online:has(input:checked) {
  border-color: var(--success-color);
  background: rgba(52, 199, 89, 0.1);
  color: var(--success-color);
}

label.status-offline:has(input:checked) {
  border-color: var(--danger-color);
  background: rgba(255, 59, 48, 0.1);
  color: var(--danger-color);
}

/* Alarm Row */
.alarm-row {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  flex-wrap: wrap;
  background: var(--input-bg);
  padding: 12px;
  border-radius: 12px;
}

.checkbox-group.horizontal {
  display: flex;
  flex-direction: row;
  gap: 1rem;
  align-items: center;
}

/* Output Section */
.output-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

#step-4 .output-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: start;
}

.output-container {
  position: relative;
  background: var(--input-bg);
  border-radius: 16px;
  padding: 1.2rem;
  border: 1px solid transparent;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

pre {
  font-size: 0.85rem;
  line-height: 1.4;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 30vh;
  overflow-y: auto;
  font-family:
    ui-monospace, Menlo, Monaco, "Cascadia Mono", "Segoe UI Mono",
    "Roboto Mono", "Oxygen Mono", "Ubuntu Monospace", "Source Code Pro",
    "Fira Mono", "Droid Sans Mono", "Courier New", monospace;
}

pre::-webkit-scrollbar {
  width: 6px;
}
pre::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

/* Navigation Buttons */
.nav-buttons {
  display: flex;
  padding-top: 1.5rem;
  margin-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  gap: 1rem;
}

.copy-btn,
.secondary-btn {
  padding: 12px 24px;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 0.95rem;
}

.copy-btn {
  background: var(--accent-color);
  color: white;
  border: none;
}

.copy-btn:hover {
  background: var(--accent-hover);
  transform: scale(1.02);
}

.copy-btn:active {
  transform: scale(0.98);
}

.secondary-btn {
  background: var(--card-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.secondary-btn:hover {
  background: var(--input-bg);
}

/* Disable copy-btn focus outline in favor of subtle scale */
.copy-btn:focus,
.secondary-btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px var(--input-focus-ring);
}

/* Responsive */
@media (max-width: 600px) {
  .container {
    padding: 1.5rem;
    border-radius: 16px;
  }

  .form-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .input-group.full-width {
    grid-column: span 1;
  }

  .alarm-row {
    flex-direction: column;
    align-items: stretch;
  }

  #step-4 .output-section {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}