/* ==========================================================================
   Staff Online Signature Portal Styles
   Enterprise grade, responsive, touch-friendly, dark/light aesthetic
   ========================================================================== */

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --primary-border: #bfdbfe;
  
  --success: #059669;
  --success-bg: #ecfdf5;
  --danger: #dc2626;
  --danger-bg: #fef2f2;
  --warning: #d97706;

  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-canvas: #ffffff;
  --border-color: #e2e8f0;
  --border-focus: #3b82f6;

  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;

  --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);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Background Subtle Grid Pattern */
.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-image: radial-gradient(#cbd5e1 0.75px, transparent 0.75px);
  background-size: 24px 24px;
}

/* Header & Trust Bar */
header.app-header {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-badge {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.brand-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.brand-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.security-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--success);
  background: var(--success-bg);
  padding: 5px 12px;
  border-radius: var(--radius-full);
  border: 1px solid #a7f3d0;
}

/* Main Content Container */
main.main-content {
  flex: 1;
  max-width: 820px;
  width: 100%;
  margin: 32px auto;
  padding: 0 20px;
}

/* Signature Card */
.signature-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.card-header-bar {
  padding: 24px 28px 16px;
  border-bottom: 1px solid var(--border-color);
  background: #ffffff;
}

.card-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-subtitle {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 6px;
}

.form-body {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Form Groups & Inputs */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 640px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: #334155;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.form-label .required-tag {
  color: var(--danger);
  font-size: 0.8rem;
}

.form-label .label-hint {
  font-size: 0.78rem;
  color: var(--text-light);
  font-weight: 400;
}

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

.input-icon {
  position: absolute;
  left: 14px;
  color: var(--text-light);
  pointer-events: none;
}

.form-input {
  width: 100%;
  padding: 12px 14px 12px 42px;
  font-size: 0.95rem;
  color: var(--text-main);
  background: #ffffff;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  outline: none;
}

.form-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.form-input:disabled {
  background: #f1f5f9;
  cursor: not-allowed;
  color: #64748b;
}

/* Canvas Signature Area */
.signature-box-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.canvas-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.tool-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.tool-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Color Chips */
.color-swatches {
  display: flex;
  align-items: center;
  gap: 6px;
}

.color-btn {
  width: 24px;
  height: 24px;
  border-radius: var(--radius-full);
  border: 2px solid transparent;
  cursor: pointer;
  padding: 0;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.color-btn:hover {
  transform: scale(1.15);
}

.color-btn.active {
  border-color: #2563eb;
  transform: scale(1.2);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.3);
}

/* Action tool buttons (Clear, Undo) */
.btn-tool {
  background: #ffffff;
  border: 1px solid var(--border-color);
  color: #475569;
  padding: 6px 12px;
  font-size: 0.82rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
}

.btn-tool:hover:not(:disabled) {
  background: #f8fafc;
  border-color: #cbd5e1;
  color: var(--text-main);
}

.btn-tool:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* Drawing Box Frame */
.canvas-frame {
  position: relative;
  background: var(--bg-canvas);
  border: 2px dashed #cbd5e1;
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  cursor: crosshair;
}

.canvas-frame:focus-within,
.canvas-frame.drawing-active {
  border-color: var(--primary);
  border-style: solid;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

#signatureCanvas {
  display: block;
  width: 100%;
  height: 240px;
  background-color: transparent;
  user-select: none;
  -webkit-user-select: none;
}

/* Signature baseline watermark guide */
.canvas-guideline {
  position: absolute;
  bottom: 45px;
  left: 36px;
  right: 36px;
  border-bottom: 1px dashed #cbd5e1;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.canvas-guideline-x {
  font-size: 1.1rem;
  font-family: Georgia, serif;
  font-weight: bold;
  color: #94a3b8;
  transform: translateY(6px);
}

.canvas-instruction {
  position: absolute;
  top: 14px;
  left: 18px;
  font-size: 0.78rem;
  color: #94a3b8;
  pointer-events: none;
  font-style: italic;
}

.canvas-watermark {
  position: absolute;
  bottom: 12px;
  right: 18px;
  font-size: 0.72rem;
  color: #cbd5e1;
  pointer-events: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Live File Name Preview Banner */
.filename-preview-box {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-md);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.filename-icon {
  color: #0284c7;
  font-size: 1.25rem;
}

.filename-details {
  flex: 1;
  overflow: hidden;
}

.filename-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  font-weight: 700;
  color: #64748b;
  letter-spacing: 0.04em;
}

.filename-text {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.88rem;
  color: #0f172a;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 2px;
}

/* Legal Declaration Checkbox */
.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  cursor: pointer;
  user-select: none;
}

.checkbox-row input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  accent-color: var(--primary);
  cursor: pointer;
}

.checkbox-text {
  font-size: 0.85rem;
  color: #475569;
  line-height: 1.4;
}

/* Submit Button & Actions */
.form-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 8px;
}

.btn-primary {
  width: 100%;
  padding: 14px 24px;
  font-size: 1rem;
  font-weight: 600;
  color: #ffffff;
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all 0.2s ease;
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #1d4ed8, #1e40af);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
  transform: translateY(-1px);
}

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

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Trust footer bar */
.card-footer-trust {
  background: #f8fafc;
  border-top: 1px solid var(--border-color);
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Alerts and Toast */
.alert-box {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  display: flex;
  align-items: center;
  gap: 10px;
  animation: fadeIn 0.3s ease;
}

.alert-danger {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid #fecaca;
}

.alert-success {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid #a7f3d0;
}

/* Modal Overlay */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-box {
  background: #ffffff;
  border-radius: var(--radius-lg);
  max-width: 520px;
  width: 100%;
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  transform: scale(0.95);
  transition: transform 0.25s ease;
}

.modal-overlay.open .modal-box {
  transform: scale(1);
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-close-btn {
  background: none;
  border: none;
  font-size: 1.3rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-sm);
}

.modal-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.signature-preview-container {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
}

.signature-preview-img {
  max-width: 100%;
  max-height: 180px;
  object-fit: contain;
}

.modal-meta-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.modal-meta-table td {
  padding: 8px 10px;
  border-bottom: 1px solid #f1f5f9;
}

.modal-meta-table td:first-child {
  font-weight: 600;
  color: #64748b;
  width: 35%;
}

.modal-meta-table td:last-child {
  color: #0f172a;
  font-family: ui-monospace, monospace;
}

.modal-footer {
  padding: 16px 24px;
  background: #f8fafc;
  border-top: 1px solid var(--border-color);
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

.btn-secondary {
  padding: 10px 18px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  color: #334155;
  cursor: pointer;
}

.btn-secondary:hover {
  background: #f1f5f9;
}

/* Success View */
.success-card {
  text-align: center;
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.success-icon-badge {
  width: 70px;
  height: 70px;
  background: #dcfce7;
  color: #16a34a;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  box-shadow: 0 4px 14px rgba(22, 163, 74, 0.2);
}

.success-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: #0f172a;
}

.success-desc {
  font-size: 0.92rem;
  color: #64748b;
  max-width: 440px;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #ffffff;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Footer */
footer.app-footer {
  text-align: center;
  padding: 24px;
  font-size: 0.8rem;
  color: var(--text-light);
  border-top: 1px solid var(--border-color);
  background: #ffffff;
}