:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text: #0f172a;
  --border: #e2e8f0;
  --success: #16a34a;
  --error: #dc2626;
  --warning: #d97706;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 80px 20px 40px;
  min-height: 100vh;
  position: relative;
}

/* Home Button (Top-Left) */
.home-btn {
  position: fixed;
  top: 18px;
  left: 20px;
  background-color: var(--card-bg);
  color: var(--primary);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: 20px;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  transition: all 0.2s ease;
  z-index: 500;
}

.home-btn:hover {
  background-color: var(--primary);
  color: white;
  border-color: var(--primary);
  transform: translateY(-1px);
}

/* Help Widget (Top-Right) */
.help-widget {
  position: fixed;
  top: 18px;
  right: 20px;
  z-index: 500;
}

.help-toggle-btn {
  background-color: var(--card-bg);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  transition: all 0.2s ease;
  width: auto;
}

.help-toggle-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.help-icon {
  background-color: var(--primary);
  color: white;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
}

.help-box {
  position: absolute;
  top: 48px;
  right: 0;
  width: 320px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.15);
  display: none;
  overflow: hidden;
  animation: fadeIn 0.2s ease-in-out;
}

.help-box.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.help-header {
  background-color: #f1f5f9;
  padding: 12px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
}

.help-header h3 {
  font-size: 0.95rem;
  color: var(--text);
}

.close-help {
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: #64748b;
  width: auto;
  padding: 0;
}

.close-help:hover {
  color: var(--text);
}

.help-content {
  padding: 16px;
  font-size: 0.85rem;
  color: #334155;
  line-height: 1.5;
}

.help-content ol {
  padding-left: 18px;
  margin-bottom: 14px;
}

.help-content li {
  margin-bottom: 6px;
}

.discrepancy-note {
  background-color: #fef3c7;
  border-left: 3px solid var(--warning);
  padding: 10px 12px;
  border-radius: 4px;
  color: #78350f;
  font-size: 0.8rem;
}

/* Container & Form */
.container {
  width: 100%;
  max-width: 650px;
  background: var(--card-bg);
  border-radius: 12px;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  padding: 28px;
}

h1 {
  font-size: 1.5rem;
  margin-bottom: 20px;
  text-align: center;
  color: var(--primary);
}

.form-group {
  margin-bottom: 16px;
}

label {
  display: block;
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 6px;
}

select, input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
}

select:focus, input:focus {
  border-color: var(--primary);
}

.image-preview-box {
  margin: 18px 0;
  border: 1px dashed var(--border);
  border-radius: 8px;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background-color: #f1f5f9;
}

.image-preview-box img {
  max-width: 100%;
  height: auto;
  display: none;
  cursor: zoom-in;
  transition: transform 0.2s ease;
}

.image-preview-box img:hover {
  transform: scale(1.01);
}

.image-placeholder {
  color: #64748b;
  font-size: 0.875rem;
  text-align: center;
  padding: 10px;
}

button[type="submit"] {
  width: 100%;
  padding: 12px;
  background-color: var(--primary);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s;
}

button[type="submit"]:hover { 
  background-color: var(--primary-hover); 
}

button:disabled { 
  opacity: 0.6; 
  cursor: not-allowed; 
}

.status-msg {
  margin-top: 16px;
  padding: 12px;
  border-radius: 6px;
  font-size: 0.9rem;
  display: none;
  text-align: center;
}

.status-msg.success { background-color: #dcfce7; color: var(--success); }
.status-msg.error { background-color: #fee2e2; color: var(--error); }
.status-msg.warning { background-color: #fef3c7; color: var(--warning); }

/* Modals & Zoom Effect */
.modal-overlay, .image-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.modal-overlay {
  background-color: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(4px);
}

.image-modal-overlay {
  background-color: rgba(0, 0, 0, 0.9);
  z-index: 2000;
  padding: 20px;
  overflow: hidden;
}

.modal-overlay.active, .image-modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: #ffffff;
  padding: 24px 32px;
  border-radius: 12px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 240px;
}

.spinner {
  width: 42px;
  height: 42px;
  border: 4px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 12px;
}

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

/* Zoomable Image */
.fullscreen-image {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 6px;
  cursor: zoom-in;
  transition: transform 0.2s ease, transform-origin 0.05s ease-out;
  transform-origin: center center;
}

.fullscreen-image.zoomed {
  transform: scale(2.5);
  cursor: zoom-out;
}

.close-modal {
  position: absolute;
  top: 15px;
  right: 25px;
  color: #ffffff;
  font-size: 40px;
  font-weight: bold;
  cursor: pointer;
  z-index: 2010;
}