:root {
  /* Samasu Construction Palette */
  --color-primary: #0055FF;
  /* Royal Blue - Signs */
  --color-accent: #FFaa00;
  /* Warning Orange - Cones/Lights */
  --color-bg-body: #F3F4F6;
  /* Light Concrete */
  --color-bg-panel: #FFFFFF;
  /* White */
  --color-text-main: #1E293B;
  /* Slate 800 */
  --color-text-muted: #64748B;
  /* Slate 500 */
  --color-border: #E2E8F0;
  /* Slate 200 */

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--color-bg-body);
  color: var(--color-text-main);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
}

/* Header */
header {
  text-align: center;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 2px solid var(--color-border);
}

header h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

header p {
  color: var(--color-text-muted);
  font-size: 1rem;
  font-weight: 500;
  max-width: 600px;
  margin: 0 auto;
}

/* Main Layout */
.main-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 1024px) {
  .main-content {
    grid-template-columns: 1fr;
  }
}

/* Common Panel Styles */
.editor-panel,
.preview-panel {
  background: var(--color-bg-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

/* Editor Panel Specifics */
.editor-panel {
  max-height: calc(100vh - 140px);
  overflow-y: auto;
}

.section {
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
}

.section:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.section h2 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Forms */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-main);
  margin-bottom: 0.4rem;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="url"],
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.6rem 0.8rem;
  font-size: 0.95rem;
  font-family: inherit;
  background: #FFFFFF;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-main);
  transition: all 0.2s ease;
}

.form-group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2364748B'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.7rem center;
  background-size: 1rem;
  padding-right: 2.5rem;
  cursor: pointer;
}

.form-group select:focus {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%230055FF'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 85, 255, 0.1);
}

.form-group input[type="color"] {
  width: 100%;
  height: 42px;
  padding: 0;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: white;
}

.form-group input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 4px;
}

.form-group input[type="color"]::-webkit-color-swatch {
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 2px;
}

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

/* Preview Panel */
.preview-panel {
  position: sticky;
  top: 2rem;
  border-top: 4px solid var(--color-accent);
  /* Industrial accent strip */
}

.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.preview-header h2 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-main);
}

/* Buttons */
.action-buttons {
  display: flex;
  gap: 0.75rem;
}

.btn {
  padding: 0.6rem 1.2rem;
  font-size: 0.85rem;
  font-weight: 700;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

/* Primary Button (Export) - Warning Orange for High Vis */
.btn-primary {
  background-color: var(--color-accent);
  color: #000000;
  border-bottom: 2px solid #cc8800;
  /* tactile feel */
}

.btn-primary:hover {
  background-color: #ffb833;
  transform: translateY(-1px);
  border-bottom-color: #cc8800;
}

.btn-primary:active {
  transform: translateY(1px);
  border-bottom: none;
  margin-top: 2px;
}

/* Secondary Button (Copy) - Royal Blue */
.btn-secondary {
  background-color: var(--color-primary);
  color: white;
  border-bottom: 2px solid #003399;
}

.btn-secondary:hover {
  background-color: #3377ff;
  transform: translateY(-1px);
  border-bottom-color: #003399;
}

.btn-secondary:active {
  transform: translateY(1px);
  border-bottom: none;
  margin-top: 2px;
}

.preview-container {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 2rem;
  min-height: 200px;
  overflow-x: auto;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.02);
}

.hint {
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-align: center;
  background: var(--color-bg-body);
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px dashed var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

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

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--color-text-main);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 99px;
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 1000;
  pointer-events: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Mobile Responsiveness */
@media (max-width: 640px) {
  .container {
    padding: 1rem;
  }

  header h1 {
    font-size: 1.5rem;
    flex-direction: column;
    gap: 0.25rem;
  }

  header p {
    font-size: 0.9rem;
  }

  .editor-panel,
  .preview-panel {
    padding: 1.25rem;
  }

  /* Ensure form elements don't zoom on iOS if font-size < 16px */
  .form-group input[type="text"],
  .form-group input[type="email"],
  .form-group input[type="url"],
  .form-group select,
  .form-group textarea {
    font-size: 16px;
  }

  .action-buttons {
    width: 100%;
    flex-direction: column;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }
}