/* ==========================================================================
   SAP ICF Activator - Design System & Modern Stylesheet
   ========================================================================== */

:root {
  --bg-app: #090d16;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-header: rgba(24, 33, 53, 0.6);
  --bg-card-footer: rgba(15, 23, 42, 0.6);
  --bg-editor: #0c121e;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: #3b82f6;
  --border-active: rgba(59, 130, 246, 0.5);

  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #64748b;
  --text-accent: #60a5fa;

  --accent-primary: #2563eb;
  --accent-primary-hover: #1d4ed8;
  --accent-secondary: #334155;
  --accent-secondary-hover: #475569;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-purple: #8b5cf6;

  --danger-color: #ef4444;
  --danger-hover: rgba(239, 68, 68, 0.15);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Menlo, Monaco, Consolas, monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  --shadow-card: 0 10px 30px -5px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.05);
  --shadow-glow: 0 0 20px rgba(37, 99, 235, 0.25);
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  background-image: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(37, 99, 235, 0.18), transparent 70%),
    radial-gradient(ellipse 60% 40% at 100% 100%, rgba(6, 182, 212, 0.08), transparent 60%),
    radial-gradient(ellipse 50% 30% at 0% 100%, rgba(139, 92, 246, 0.08), transparent 50%);
  background-attachment: fixed;
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.app-container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  gap: 20px;
}

/* ==========================================================================
   Header
   ========================================================================== */
.app-header {
  padding-bottom: 8px;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

.logo-area h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(to right, #ffffff, #d1d5db);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.tagline {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 1px;
}

.header-badges {
  display: flex;
  align-items: center;
  gap: 8px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.badge-secure {
  background: rgba(16, 185, 129, 0.12);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.badge-version {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

/* ==========================================================================
   Format Rule Banner
   ========================================================================== */
.format-banner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
}

.format-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(30, 41, 59, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast);
}

.format-chip:hover {
  border-color: rgba(255, 255, 255, 0.2);
}

.chip-label {
  text-transform: uppercase;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.header-chip .chip-label { color: #f59e0b; }
.prefix-chip .chip-label { color: #60a5fa; }
.service-chip .chip-label { color: #34d399; }
.suffix-chip .chip-label { color: #c084fc; }

.format-divider {
  color: var(--border-color);
  font-weight: 300;
  user-select: none;
}

.format-chip code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.35);
  padding: 2px 6px;
  border-radius: 4px;
}

.format-plus {
  color: var(--text-muted);
  font-weight: 700;
  font-size: 1rem;
}

/* ==========================================================================
   Workspace Grid (Input & Output)
   ========================================================================== */
.workspace-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  flex: 1;
}

@media (max-width: 960px) {
  .workspace-grid {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: border-color var(--transition-normal);
}

.card:focus-within {
  border-color: rgba(59, 130, 246, 0.4);
}

.card-header {
  background: var(--bg-card-header);
  border-bottom: 1px solid var(--border-color);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.card-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-header h2 {
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.counter-tag {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-secondary);
  padding: 2px 8px;
  border-radius: 9999px;
  font-weight: 500;
}

.counter-tag.active {
  background: rgba(37, 99, 235, 0.15);
  color: #93c5fd;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.card-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 7px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  text-decoration: none;
}

.btn-sm {
  padding: 5px 10px;
  font-size: 0.75rem;
}

.btn-primary {
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.5);
  transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.07);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.18);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
}

.btn-danger-hover:hover {
  background: var(--danger-hover);
  color: var(--danger-color);
}

.btn:disabled,
.btn[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

.file-upload-label {
  cursor: pointer;
}

/* ==========================================================================
   Editors & Preview
   ========================================================================== */
.editor-wrapper {
  position: relative;
  flex: 1;
  min-height: 480px;
  display: flex;
  background-color: var(--bg-editor);
}

.code-textarea {
  width: 100%;
  height: 100%;
  min-height: 480px;
  background: transparent;
  border: none;
  outline: none;
  resize: none;
  padding: 16px 18px;
  color: #e2e8f0;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.65;
  white-space: pre;
  overflow-wrap: normal;
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
}

.code-textarea::placeholder {
  color: #475569;
  font-style: italic;
}

.code-preview {
  width: 100%;
  height: 100%;
  min-height: 480px;
  padding: 16px 18px;
  overflow: auto;
  position: relative;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
}

.preview-content {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.65;
  color: #93c5fd;
  white-space: pre;
  margin: 0;
  user-select: text;
}

.preview-content.hidden {
  display: none;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.12);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.22);
}

/* Empty State */
.empty-state {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--text-muted);
  text-align: center;
  padding: 24px;
  pointer-events: none;
}

.empty-state svg {
  stroke: #475569;
  margin-bottom: 4px;
}

.empty-state p {
  font-size: 0.9375rem;
  font-weight: 500;
  color: #94a3b8;
}

.empty-state span {
  font-size: 0.8125rem;
  color: #64748b;
}

/* ==========================================================================
   Card Footer
   ========================================================================== */
.card-footer {
  background: var(--bg-card-footer);
  border-top: 1px solid var(--border-color);
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.toggle-checkbox {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}

.toggle-checkbox input[type="checkbox"] {
  appearance: none;
  width: 16px;
  height: 16px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
}

.toggle-checkbox input[type="checkbox"]:checked {
  background-color: var(--accent-primary);
  border-color: var(--accent-primary);
}

.toggle-checkbox input[type="checkbox"]:checked::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 5px;
  width: 4px;
  height: 8px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.meta-stats {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.meta-stats .bullet {
  color: var(--text-muted);
}

.filename-config {
  display: flex;
  align-items: center;
  gap: 6px;
}

.filename-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.filename-field {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 4px 8px;
  width: 210px;
  outline: none;
  transition: border-color var(--transition-fast);
}

.filename-field:focus {
  border-color: var(--border-focus);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.app-footer {
  text-align: center;
  padding: 12px 0;
  color: var(--text-muted);
  font-size: 0.75rem;
}

.app-footer strong {
  color: var(--text-secondary);
}

/* ==========================================================================
   Toast Notification
   ========================================================================== */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: #1e293b;
  color: #ffffff;
  border: 1px solid rgba(59, 130, 246, 0.4);
  box-shadow: 0 10px 25px -3px rgba(0, 0, 0, 0.5), 0 0 15px rgba(59, 130, 246, 0.25);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.875rem;
  font-weight: 500;
  opacity: 0;
  transform: translateY(16px) scale(0.96);
  pointer-events: none;
  transition: all var(--transition-normal);
  z-index: 1000;
}

.toast.show {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.toast svg {
  color: #34d399;
}