/* ==========================================================================
   Design System & Theme Tokens (Linear/Vercel Inspired)
   ========================================================================== */

:root {
  /* Color Palette - Dark Default */
  --bg-app: #09090b;
  --bg-card: #121215;
  --bg-card-hover: #18181b;
  --bg-subtle: #1c1c20;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-hover: rgba(255, 255, 255, 0.16);

  --text-primary: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;

  --accent-primary: #6366f1;
  --accent-primary-hover: #4f46e5;
  --accent-glow: rgba(99, 102, 241, 0.15);
  
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.1);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.1);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

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

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px -8px rgba(0, 0, 0, 0.6);

  --transition-fast: 0.15s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
  --bg-app: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-subtle: #f1f5f9;

  --border-color: #e2e8f0;
  --border-color-hover: #cbd5e1;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  --accent-primary: #4f46e5;
  --accent-primary-hover: #4338ca;
  --accent-glow: rgba(79, 70, 229, 0.1);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 12px 24px -6px rgba(0, 0, 0, 0.08);
}

/* ==========================================================================
   Base & Resets
   ========================================================================== */

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

body {
  background-color: var(--bg-app);
  color: var(--text-primary);
  font-family: var(--font-sans);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  line-height: 1.5;
  padding: 2rem 1rem;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
}

/* Layout Wrapper */
.app-container {
  width: 100%;
  max-width: 860px;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

/* ==========================================================================
   Header
   ========================================================================== */

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.25rem 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.brand-icon {
  width: 32px;
  height: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-primary);
  box-shadow: var(--shadow-sm);
}

.brand-name {
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
}

.icon-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-color-hover);
}

[data-theme="dark"] .sun-icon,
[data-theme="light"] .moon-icon {
  display: block;
}

[data-theme="dark"] .moon-icon,
[data-theme="light"] .sun-icon {
  display: none;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hero-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-primary), transparent);
  opacity: 0.7;
}

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

.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--success);
  background: var(--success-bg);
  padding: 0.25rem 0.625rem;
  border-radius: 9999px;
}

.pulse-dot {
  width: 6px;
  height: 6px;
  background-color: var(--success);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--success);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.type-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-subtle);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.hero-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.ip-display-wrapper {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 0.25rem;
  flex-wrap: wrap;
}

.ip-display {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.1;
}

.copy-pill-btn {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.5rem 0.875rem;
  border-radius: 9999px;
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  transition: all var(--transition-fast);
}

.copy-pill-btn:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #ffffff;
}

.hero-meta-bar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

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

.meta-value {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-primary);
}

.meta-divider {
  width: 1px;
  height: 24px;
  background: var(--border-color);
}

/* ==========================================================================
   Action Bar
   ========================================================================== */

.actions-bar {
  display: flex;
  gap: 0.75rem;
}

.primary-btn, .secondary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.125rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.primary-btn {
  background: var(--text-primary);
  color: var(--bg-app);
  border: none;
}

.primary-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.secondary-btn {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

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

.spinning {
  animation: spin 0.75s linear infinite;
}

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

/* ==========================================================================
   Grid Layout & Cards
   ========================================================================== */

.grid-layout {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.data-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast);
}

.data-card:hover {
  border-color: var(--border-color-hover);
}

.card-full-width {
  grid-column: span 2;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-title-group {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.card-icon {
  color: var(--accent-primary);
  display: flex;
  align-items: center;
}

.card-header h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.card-body {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.detail-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
}

.detail-key {
  color: var(--text-secondary);
}

.detail-value-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.detail-val {
  font-weight: 500;
  color: var(--text-primary);
  text-align: right;
}

.detail-val.mono {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.copy-sub-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.75rem;
  cursor: pointer;
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.copy-sub-btn:hover {
  background: var(--bg-subtle);
  color: var(--text-primary);
}

/* ==========================================================================
   Risk & Security Section
   ========================================================================== */

.grid-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: center;
}

.status-pill {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.625rem;
  border-radius: 9999px;
}

.pill-neutral {
  background: var(--bg-subtle);
  color: var(--text-muted);
}

.risk-meter-section {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.risk-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.risk-score-val {
  color: var(--text-primary);
  font-weight: 600;
}

.meter-bar-bg {
  width: 100%;
  height: 8px;
  background: var(--bg-subtle);
  border-radius: 9999px;
  overflow: hidden;
}

.meter-bar-fill {
  height: 100%;
  background: var(--accent-primary);
  border-radius: 9999px;
  transition: width 0.6s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.3s;
}

.risk-description {
  font-size: 0.78125rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin-top: 0.25rem;
}

.security-checks {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.check-item {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
}

.check-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  margin-top: 0.375rem;
  flex-shrink: 0;
}

.check-dot.safe { background: var(--success); }
.check-dot.warn { background: var(--warning); }

.check-info {
  display: flex;
  flex-direction: column;
}

.check-title {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-primary);
}

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

/* ==========================================================================
   Skeleton Loading State
   ========================================================================== */

.skeleton-text {
  position: relative;
  overflow: hidden;
  color: transparent !important;
  background-color: var(--bg-subtle);
  border-radius: var(--radius-sm);
  user-select: none;
}

.skeleton-text::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  transform: translateX(-100%);
  background-image: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0) 0,
    rgba(255, 255, 255, 0.05) 20%,
    rgba(255, 255, 255, 0.1) 60%,
    rgba(255, 255, 255, 0)
  );
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  100% { transform: translateX(100%); }
}

/* ==========================================================================
   Toast Notification
   ========================================================================== */

.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--text-primary);
  color: var(--bg-app);
  padding: 0.625rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: all var(--transition-fast);
  z-index: 1000;
}

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

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 0.75rem;
}

.privacy-note {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */

@media (max-width: 640px) {
  body {
    padding: 1rem 0.75rem;
  }

  .grid-layout, .grid-2col {
    grid-template-columns: 1fr;
  }

  .card-full-width {
    grid-column: span 1;
  }

  .hero-card {
    padding: 1.5rem;
  }

  .actions-bar {
    flex-direction: column;
  }

  .primary-btn, .secondary-btn {
    width: 100%;
  }
    }