:root {
  /* Color Palette - Cyber Security Cleanroom */
  --bg-app: #0b0f19;
  --bg-darker: #06090f;
  --bg-panel: #111827;
  --bg-card: #1f2937;
  --border-color: #374151;
  
  --text-main: #f9fafb;
  --text-muted: #9ca3af;
  
  --accent-primary: #3b82f6;      /* Trust Blue */
  --accent-hover: #2563eb;
  
  --alert-critical: #ef4444;      /* Crimson Danger */
  --alert-critical-bg: rgba(239, 68, 68, 0.1);
  --alert-warning: #f59e0b;       /* Amber Warning */
  
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  background-color: var(--bg-app);
  color: var(--text-main);
  font-family: var(--font-sans);
  margin: 0;
  padding: 0;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

p.subtitle {
  color: var(--text-muted);
  margin: 0;
}

/* Dropzone Styles */
.dropzone-container {
  border: 2px dashed var(--border-color);
  border-radius: 0.5rem;
  padding: 4rem 2rem;
  text-align: center;
  background-color: var(--bg-panel);
  transition: all 0.3s ease;
  cursor: pointer;
  margin-bottom: 2rem;
}

.dropzone-container.dragover {
  border-color: var(--accent-primary);
  background-color: rgba(59, 130, 246, 0.05);
}

.dropzone-container h2 {
  color: var(--text-main);
  margin-top: 0;
}

.dropzone-container p {
  color: var(--text-muted);
  margin-bottom: 0;
}

/* Security Alarm Banner */
.security-alarm {
  background: var(--alert-critical-bg);
  border-left: 4px solid var(--alert-critical);
  padding: 1rem 1.5rem;
  border-radius: 0.375rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.security-alarm h3 {
  margin: 0 0 0.25rem 0;
  color: var(--alert-critical);
}

.security-alarm p {
  margin: 0;
  color: var(--text-main);
}

/* Dashboard Styles */
.dashboard {
  display: none;
}

.dashboard.active {
  display: block;
}

.file-meta-header {
  background-color: var(--bg-panel);
  padding: 1rem;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
  border: 1px solid var(--border-color);
}

.file-meta-header h3 {
  margin: 0;
}

.tabs {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.75rem 1rem;
  cursor: pointer;
  font-family: var(--font-sans);
  font-weight: 500;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
}

.tab-btn:hover {
  color: var(--text-main);
}

.tab-btn.active {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
}

.tab-content {
  background-color: var(--bg-panel);
  padding: 1.5rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border-color);
  min-height: 200px;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(4px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

.loading-overlay.hidden {
  display: none;
}

.loading-content {
  text-align: center;
}

.spinner {
  width: 3rem;
  height: 3rem;
  border: 4px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem auto;
}

#loading-text {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: bold;
  color: var(--text-main);
  margin: 0;
}

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

/* Navbar */
.navbar {
  background-color: rgba(11, 15, 25, 0.9);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border-color);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.logo {
  width: 24px;
  height: 24px;
  background: linear-gradient(135deg, var(--accent-primary), #60a5fa);
  border-radius: 4px;
}

.logo-small {
  width: 16px;
  height: 16px;
}

.nav-links {
  display: none;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .nav-links {
    display: flex;
  }
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text-main);
}

/* Hero / Banner */
.hero {
  padding: 4rem 1.5rem;
  text-align: center;
  background: radial-gradient(circle at top center, rgba(59, 130, 246, 0.1), transparent 70%);
}

.hero-container {
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.hero p {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  line-height: 1.6;
}

.cta-button {
  display: inline-block;
  background-color: var(--accent-primary);
  color: white;
  text-decoration: none;
  padding: 0.875rem 2rem;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 1rem;
  transition: background-color 0.2s, transform 0.1s;
}

.cta-button:hover {
  background-color: var(--accent-hover);
}

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

@media (min-width: 768px) {
  .hero { padding: 6rem 1.5rem; }
  .hero h1 { font-size: 3.5rem; }
  .hero p { font-size: 1.25rem; }
}

/* App Section */
.app-section {
  padding: 2rem 0 4rem;
  position: relative;
}

.app-header {
  text-align: center;
  margin-bottom: 2rem;
}

.app-header h2 {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  margin: 0 0 0.5rem;
}

.drop-icon {
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

/* Features Section */
.features-section {
  padding: 4rem 0;
  background-color: var(--bg-darker);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title h2 {
  font-size: 1.75rem;
  margin: 0 0 0.5rem;
}

.section-title p {
  color: var(--text-muted);
  font-size: 1rem;
  margin: 0;
}

@media (min-width: 768px) {
  .section-title h2 { font-size: 2rem; }
  .section-title p { font-size: 1.1rem; }
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.feature-card {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 1.5rem;
  transition: transform 0.2s, border-color 0.2s;
}

.feature-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-primary);
}

.feature-card h3 {
  color: var(--accent-primary);
  margin: 0 0 1rem;
  font-size: 1.25rem;
}

.feature-card p {
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0;
  font-size: 0.95rem;
}

/* FAQ Section */
.faq-section {
  padding: 4rem 0;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.faq-item {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 1.5rem;
}

.faq-item h4 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
}

.faq-item p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.5;
  font-size: 0.95rem;
}

/* Footer */
.footer {
  background-color: var(--bg-darker);
  border-top: 1px solid var(--border-color);
  padding: 2rem 0;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .footer-container {
    flex-direction: row;
    justify-content: space-between;
  }
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--text-main);
}

.copyright {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin: 0;
}

/* Export Component overrides */
.export-container {
  margin-top: 1.5rem;
  text-align: right;
}

.sanitize-btn {
  background: var(--alert-critical);
  color: white;
  padding: 0.875rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-weight: bold;
  font-size: 1rem;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
}

.sanitize-btn:hover {
  opacity: 0.9;
}

.sanitize-btn:active {
  transform: scale(0.98);
}