/* Modern Fintech Design System for IBAN EPC QR Code Generator */

:root {
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  /* Light Theme Palette */
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-input: #ffffff;
  --bg-muted: #f1f5f9;
  --bg-hover: #e2e8f0;
  
  --border-color: #e2e8f0;
  --border-focus: #3b82f6;
  
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-glow: rgba(37, 99, 235, 0.2);
  
  --success: #10b981;
  --success-bg: #ecfdf5;
  --danger: #ef4444;
  --danger-bg: #fef2f2;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-main: #0b0f19;
  --bg-card: #151d2f;
  --bg-input: #101626;
  --bg-muted: #1c263c;
  --bg-hover: #263350;
  
  --border-color: #27354f;
  --border-focus: #60a5fa;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-light: #64748b;
  
  --primary: #3b82f6;
  --primary-hover: #60a5fa;
  --primary-glow: rgba(59, 130, 246, 0.25);
  
  --success: #34d399;
  --success-bg: rgba(16, 185, 129, 0.12);
  --danger: #f87171;
  --danger-bg: rgba(239, 68, 68, 0.12);
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Header */
.app-header {
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-card);
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(8px);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), #6366f1);
  color: #ffffff;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px var(--primary-glow);
}

.logo-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.badge-standard {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--bg-muted);
  color: var(--text-muted);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-toggle-btn {
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.theme-toggle-btn:hover {
  background: var(--bg-hover);
}

/* Layout Grid */
.main-wrapper {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1.5rem;
  flex: 1;
  width: 100%;
}

.layout-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 900px) {
  .layout-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

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

.card-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-main);
}

/* Form controls */
.form-section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

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

@media (max-width: 600px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-main);
}

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

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon-prefix {
  position: absolute;
  left: 0.85rem;
  color: var(--text-light);
  pointer-events: none;
  font-weight: 500;
}

input[type="text"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text-main);
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  outline: none;
  transition: var(--transition);
}

input.has-prefix {
  padding-left: 2.2rem;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.iban-input {
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.status-badge {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
}

.status-badge.valid {
  background: var(--success-bg);
  color: var(--success);
}

.status-badge.invalid {
  background: var(--danger-bg);
  color: var(--danger);
}

/* Radio button group */
.radio-group {
  display: flex;
  gap: 1.25rem;
  margin-top: 0.25rem;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  cursor: pointer;
}

.counter {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: right;
}

.counter.limit-exceeded {
  color: var(--danger);
  font-weight: 600;
}

/* Action Buttons & Utilities */

.btn-secondary {
  padding: 0.6rem 1rem;
  background: var(--bg-muted);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

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

/* QR Code Display Card */
.qr-preview-card {
  position: sticky;
  top: 5.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.qr-box {
  background: #ffffff;
  padding: 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 280px;
  width: 100%;
  max-width: 320px;
  margin: 0 auto 1.5rem auto;
  position: relative;
}

.qr-box canvas {
  width: 100% !important;
  height: auto !important;
  max-width: 270px;
  image-rendering: pixelated;
  border-radius: 4px;
}

.qr-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  color: #94a3b8;
  text-align: center;
  padding: 2rem 1rem;
}

.error-banner {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  margin-bottom: 1.25rem;
  width: 100%;
  display: none;
}

/* Action Buttons */
.action-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  width: 100%;
}

.btn-primary {
  grid-column: span 2;
  padding: 0.85rem 1.25rem;
  background: var(--primary);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 10px var(--primary-glow);
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-primary:disabled,
.btn-secondary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-action {
  padding: 0.65rem 0.85rem;
  background: var(--bg-muted);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  cursor: pointer;
  transition: var(--transition);
}

.btn-action:hover:not(:disabled) {
  background: var(--bg-hover);
}

/* Payload Inspector */
.payload-inspector {
  margin-top: 1.5rem;
  width: 100%;
}

.toggle-link {
  background: none;
  border: none;
  color: var(--primary);
  font-size: 0.8rem;
  cursor: pointer;
  text-decoration: underline;
  padding: 0;
}

.payload-content-box {
  margin-top: 0.75rem;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  position: relative;
}

.payload-pre {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--text-muted);
}

.btn-copy-mini {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  padding: 0.25rem 0.5rem;
  font-size: 0.7rem;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  background: #1e293b;
  color: #ffffff;
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: var(--shadow-xl);
  opacity: 0;
  transform: translateY(1rem);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 100;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.toast.toast-error {
  background: #ef4444;
}

/* Footer */
.app-footer {
  border-top: 1px solid var(--border-color);
  background: var(--bg-card);
  padding: 1.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: auto;
}

.app-footer a {
  color: var(--primary);
  text-decoration: none;
}

/* Print Only Styles */
.print-only {
  display: none;
}

@media print {
  body {
    background: #ffffff !important;
    color: #000000 !important;
  }
  
  .app-header,
  .form-card,
  .app-footer,
  .action-grid,
  .payload-inspector,
  .theme-toggle-btn,
  .error-banner {
    display: none !important;
  }
  
  .main-wrapper {
    margin: 0;
    padding: 0;
    max-width: 100%;
  }

  .layout-grid {
    display: block;
  }

  .card {
    border: none;
    box-shadow: none;
    padding: 0;
  }

  .print-only {
    display: block !important;
  }

  .print-slip {
    border: 2px dashed #94a3b8;
    border-radius: 8px;
    padding: 2rem;
    max-width: 650px;
    margin: 2rem auto;
    page-break-inside: avoid;
  }

  .print-slip-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid #0f172a;
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
  }

  .print-title {
    font-size: 1.5rem;
    font-weight: bold;
  }

  .print-body {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 2rem;
    align-items: center;
  }

  .print-details {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
  }

  .print-row {
    display: flex;
    flex-direction: column;
  }

  .print-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: #64748b;
    font-weight: 600;
  }

  .print-val {
    font-size: 1.05rem;
    font-weight: 500;
  }

  .print-val.amount {
    font-size: 1.4rem;
    font-weight: 700;
    color: #0f172a;
  }

  .print-qr img {
    width: 180px;
    height: 180px;
  }
}