/* CSS Variables */
:root {
  --color-safe: #2d7d46;
  --color-safe-bg: #e8f5e9;
  --color-caution: #f59e0b;
  --color-caution-bg: #fef3c7;
  --color-unsafe: #dc2626;
  --color-unsafe-bg: #fee2e2;

  --color-primary: #2d7d46;
  --color-primary-dark: #236339;
  --color-text: #1f2937;
  --color-text-secondary: #6b7280;
  --color-background: #f9fafb;
  --color-surface: #ffffff;
  --color-border: #e5e7eb;

  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --border-radius: 12px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
}

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

/* Base Styles */
html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
}

#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
}

/* Header */
.header {
  background: var(--color-surface);
  padding: var(--spacing-md) var(--spacing-lg);
  text-align: center;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.5px;
}

.logo-accent {
  color: var(--color-primary);
}

/* Main Content */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-lg);
}

/* State Management */
.state {
  display: none;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 480px;
}

.state.active {
  display: flex;
}

/* Ready State */
.ready-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 320px;
  width: 100%;
}

/* Drop Zone */
.drop-zone {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 480px;
  padding: var(--spacing-xl);
  border-radius: var(--border-radius);
  transition: background-color 0.2s, border-color 0.2s;
}

.drop-zone.drag-over {
  background: var(--color-safe-bg);
  border: 2px dashed var(--color-primary);
}

.drop-overlay {
  display: none;
  position: absolute;
  inset: 0;
  background: var(--color-safe-bg);
  border: 2px dashed var(--color-primary);
  border-radius: var(--border-radius);
  align-items: center;
  justify-content: center;
  z-index: 5;
}

.drop-zone.drag-over .drop-overlay {
  display: flex;
}

.drop-zone.drag-over .ready-content {
  opacity: 0.3;
}

.drop-overlay-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  color: var(--color-primary);
  font-size: 1.125rem;
  font-weight: 600;
}

.drop-icon {
  width: 48px;
  height: 48px;
}

/* Mobile/Desktop text variants */
.desktop-text {
  display: none;
}

.mobile-text {
  display: inline;
}

/* Show desktop text on larger screens */
@media (min-width: 768px) {
  .desktop-text {
    display: inline;
  }

  .mobile-text {
    display: none;
  }

  .drop-zone {
    border: 2px dashed var(--color-border);
    background: var(--color-surface);
  }

  .drop-zone:hover {
    border-color: var(--color-text-secondary);
  }
}

.icon-container {
  width: 80px;
  height: 80px;
  background: var(--color-safe-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-lg);
}

.scan-icon {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
}

.ready-text {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  font-size: 1rem;
}

/* Trust Notes */
.trust-notes {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-lg);
}

.trust-note {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-xs);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.trust-icon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  margin-top: 2px;
}

/* Scan Button */
.scan-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  background: var(--color-primary);
  color: white;
  font-size: 1.125rem;
  font-weight: 600;
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
  -webkit-tap-highlight-color: transparent;
}

.scan-button:hover {
  background: var(--color-primary-dark);
}

.scan-button:active {
  transform: scale(0.98);
}

.scan-button.secondary {
  background: var(--color-surface);
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.scan-button.secondary:hover {
  background: var(--color-safe-bg);
}

.button-icon {
  width: 24px;
  height: 24px;
}

/* Processing State */
.processing-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.processing-text {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
}

/* Result State */
.result-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 400px;
  gap: var(--spacing-lg);
}

.result-card {
  background: var(--color-surface);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  width: 100%;
  overflow: hidden;
}

.result-thumbnail {
  width: 100%;
  max-height: 120px;
  object-fit: contain;
  border-radius: 12px 12px 0 0;
  background: #f5f5f5;
}

/* Verdict Badge */
.verdict-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg);
  font-size: 1.5rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.verdict-badge.safe {
  background: var(--color-safe-bg);
  color: var(--color-safe);
}

.verdict-badge.caution {
  background: var(--color-caution-bg);
  color: var(--color-caution);
}

.verdict-badge.unsafe {
  background: var(--color-unsafe-bg);
  color: var(--color-unsafe);
}

.verdict-icon {
  font-size: 1.75rem;
}

/* Result Details */
.result-details {
  padding: var(--spacing-lg);
}

.section-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--spacing-sm);
}

.flagged-section,
.warnings-section {
  margin-bottom: var(--spacing-lg);
}

.flagged-section:empty,
.warnings-section:empty {
  display: none;
}

.flagged-list,
.warnings-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.flagged-list li {
  background: var(--color-unsafe-bg);
  color: var(--color-unsafe);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  font-size: 0.875rem;
  font-weight: 500;
}

.warnings-list li {
  background: var(--color-caution-bg);
  color: var(--color-caution);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  font-size: 0.875rem;
  font-weight: 500;
}

.explanation-section {
  margin-bottom: var(--spacing-md);
}

.explanation-text {
  color: var(--color-text);
  font-size: 1rem;
  line-height: 1.6;
}

.confidence-section {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.875rem;
}

.confidence-label {
  color: var(--color-text-secondary);
}

.confidence-value {
  font-weight: 600;
}

.confidence-value.high {
  color: var(--color-safe);
}

.confidence-value.medium {
  color: var(--color-caution);
}

.confidence-value.low {
  color: var(--color-unsafe);
}

/* Error State */
.error-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 320px;
  gap: var(--spacing-md);
}

.error-icon {
  width: 64px;
  height: 64px;
  color: var(--color-unsafe);
}

.error-icon svg {
  width: 100%;
  height: 100%;
}

.error-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
}

.error-message {
  color: var(--color-text-secondary);
}

/* Offline State */
.offline-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 320px;
  gap: var(--spacing-md);
}

.offline-icon {
  width: 64px;
  height: 64px;
  color: var(--color-text-secondary);
}

.offline-icon svg {
  width: 100%;
  height: 100%;
}

.offline-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
}

.offline-message {
  color: var(--color-text-secondary);
}

/* Footer */
.footer {
  background: var(--color-surface);
  padding: var(--spacing-md) var(--spacing-lg);
  text-align: center;
  border-top: 1px solid var(--color-border);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

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

.footer-link:hover {
  color: var(--color-primary-dark);
}

.footer-divider {
  margin: 0 var(--spacing-sm);
}

.scan-counter {
  color: var(--color-text-secondary);
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
}

.modal[hidden] {
  display: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
}

.modal-content {
  position: relative;
  background: var(--color-surface);
  border-radius: var(--border-radius);
  padding: var(--spacing-xl);
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal-close {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.modal-close:hover {
  background: var(--color-background);
}

.modal-content h2 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
}

.modal-content h3 {
  font-size: 1rem;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

.modal-content p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.modal-content ol,
.modal-content ul {
  margin-left: var(--spacing-lg);
  color: var(--color-text-secondary);
}

.modal-content li {
  margin-bottom: var(--spacing-xs);
}

.about-footer {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.875rem;
}

.about-footer a {
  color: var(--color-primary);
}

/* Responsive */
@media (min-width: 640px) {
  .header {
    padding: var(--spacing-lg) var(--spacing-xl);
  }

  .logo {
    font-size: 1.75rem;
  }

  .main {
    padding: var(--spacing-xl);
  }

  .icon-container {
    width: 100px;
    height: 100px;
  }

  .scan-icon {
    width: 50px;
    height: 50px;
  }
}

/* Safe area insets for notched devices */
@supports (padding-top: env(safe-area-inset-top)) {
  .header {
    padding-top: calc(var(--spacing-md) + env(safe-area-inset-top));
  }

  .footer {
    padding-bottom: calc(var(--spacing-md) + env(safe-area-inset-bottom));
  }
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  .spinner {
    animation: none;
  }

  .scan-button {
    transition: none;
  }
}