:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-tertiary: #1a2332;
  --bg-card: #1e293b;
  --bg-card-hover: #2d3b52;

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-primary: #6366f1;
  --accent-secondary: #8b5cf6;
  --accent-success: #10b981;
  --accent-error: #ef4444;
  --accent-warning: #f59e0b;

  --border-color: #334155;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);

  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
  --gradient-error: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  --gradient-card: linear-gradient(135deg, #1e293b 0%, #1a2332 100%);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei",
    "微软雅黑", "PingFang SC", "Hiragino Sans GB", "Helvetica Neue", Arial,
    sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  background-image: radial-gradient(
      at 0% 0%,
      rgba(99, 102, 241, 0.1) 0px,
      transparent 50%
    ),
    radial-gradient(at 100% 100%, rgba(139, 92, 246, 0.1) 0px, transparent 50%);
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
}

/* Header Styles */
.header {
  text-align: center;
  margin-bottom: 3rem;
  padding: 2rem 0;
}

.header-content {
  animation: fadeInDown 0.6s ease-out;
}

.title {
  font-size: 2.5rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.title-icon {
  width: 3rem;
  height: 3rem;
  stroke: var(--accent-primary);
  filter: drop-shadow(0 0 10px rgba(99, 102, 241, 0.5));
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  font-weight: 400;
}

/* Upload Section */
.upload-section {
  margin-bottom: 3rem;
  animation: fadeInUp 0.6s ease-out 0.2s both;
}

.upload-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: 1.5rem;
  padding: 3rem;
  text-align: center;
  box-shadow: var(--shadow-xl);
  transition: all 0.3s ease;
}

.upload-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 25px 35px -5px rgba(0, 0, 0, 0.7);
}

.upload-icon {
  width: 4rem;
  height: 4rem;
  margin: 0 auto 1.5rem;
  padding: 1rem;
  background: var(--gradient-primary);
  border-radius: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: float 3s ease-in-out infinite;
}

.upload-icon svg {
  width: 100%;
  height: 100%;
  stroke: white;
}

.upload-card h3 {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  color: var(--text-primary);
}

.file-inputs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.file-input-group {
  text-align: left;
}

.file-label {
  display: block;
  cursor: pointer;
}

.label-text {
  display: block;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.file-input {
  display: none;
}

.file-name {
  display: block;
  padding: 1rem 1.5rem;
  background: var(--bg-secondary);
  border: 2px dashed var(--border-color);
  border-radius: 0.75rem;
  color: var(--text-muted);
  transition: all 0.3s ease;
  font-size: 0.9rem;
}

.file-label:hover .file-name {
  border-color: var(--accent-primary);
  background: var(--bg-tertiary);
}

.file-name.selected {
  border-style: solid;
  border-color: var(--accent-primary);
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.analyze-btn {
  padding: 1rem 3rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: white;
  background: var(--gradient-primary);
  border: none;
  border-radius: 0.75rem;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.analyze-btn svg {
  width: 1.5rem;
  height: 1.5rem;
}

.analyze-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
}

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

.analyze-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Stats Section */
.stats-section {
  margin-bottom: 3rem;
  animation: fadeInUp 0.6s ease-out;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.stat-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-md);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.stat-icon {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.stat-icon svg {
  width: 1.75rem;
  height: 1.75rem;
  stroke: white;
}

.stat-icon.success {
  background: var(--gradient-success);
}

.stat-icon.error {
  background: var(--gradient-error);
}

.stat-icon.total {
  background: var(--gradient-primary);
}

.stat-icon.rate {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

.stat-content {
  flex: 1;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Charts Section */
.charts-section {
  animation: fadeInUp 0.6s ease-out;
}

.chart-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: 1.5rem;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-xl);
  transition: all 0.3s ease;
}

.chart-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 25px 35px -5px rgba(0, 0, 0, 0.7);
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.chart-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
}

.chart-title::before {
  content: "";
  width: 4px;
  height: 1.5rem;
  background: var(--gradient-primary);
  border-radius: 2px;
}

.filter-controls {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  flex: 1;
}

.filter-input-group {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.filter-input {
  flex: 1;
  padding: 0.6rem 1rem;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: 0.5rem;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: inherit;
  transition: all 0.3s ease;
}

.filter-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  background: var(--bg-tertiary);
}

.filter-input::placeholder {
  color: var(--text-muted);
}

.add-filter-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  background: var(--gradient-primary);
  border: none;
  border-radius: 0.5rem;
  color: white;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.add-filter-btn svg {
  width: 1rem;
  height: 1rem;
}

.add-filter-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.add-filter-btn:active {
  transform: translateY(0);
}

.filter-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.filter-tag {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.8rem;
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.4);
  border-radius: 0.4rem;
  color: var(--text-primary);
  font-size: 0.85rem;
  animation: slideIn 0.2s ease;
}

.filter-tag-text {
  color: var(--accent-primary);
  font-weight: 500;
}

.remove-filter-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.2rem;
  height: 1.2rem;
  background: rgba(239, 68, 68, 0.2);
  border: none;
  border-radius: 0.25rem;
  color: var(--accent-error);
  cursor: pointer;
  transition: all 0.2s ease;
  padding: 0;
}

.remove-filter-btn svg {
  width: 0.75rem;
  height: 0.75rem;
}

.remove-filter-btn:hover {
  background: rgba(239, 68, 68, 0.4);
  transform: scale(1.1);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-10px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Custom Legend Styles */
.chart-with-legend {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.chart-with-legend canvas {
  flex: 1;
  max-width: 70%;
}

.custom-legend {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 0.5rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 0.375rem;
  transition: all 0.2s ease;
  user-select: none;
}

.legend-item:hover {
  background: rgba(99, 102, 241, 0.1);
}

.legend-color {
  width: 15px;
  height: 15px;
  border-radius: 0.25rem;
  flex-shrink: 0;
}

.legend-text {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: all 0.2s ease;
}

.legend-item.legend-hidden .legend-text {
  text-decoration: line-through;
  opacity: 0.5;
}

.legend-item.legend-hidden .legend-color {
  opacity: 0.3;
}

.chart-container {
  position: relative;
  height: 400px;
}

/* Specific height for top domains chart (Top 20) */
#topDomainsChart {
  height: 550px !important;
}

.chart-card:has(#topDomainsChart) .chart-container {
  height: 600px;
  overflow: visible;
}

.chart-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 2rem;
}

.chart-row .chart-container {
  height: 300px;
}

/* Utility Classes */
.hidden {
  display: none !important;
}

/* Footer Styles */
.footer {
  margin-top: 4rem;
  padding: 2rem 0;
  border-top: 1px solid var(--border-color);
  animation: fadeInUp 0.6s ease-out;
}

.footer-content {
  display: flex;
  justify-content: center;
  align-items: center;
}

.github-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-md);
}

.github-link:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-primary);
  color: var(--text-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.github-logo {
  width: 1.5rem;
  height: 1.5rem;
  transition: all 0.3s ease;
}

.github-link:hover .github-logo {
  color: var(--accent-primary);
  transform: rotate(360deg);
}

.github-text {
  font-size: 0.95rem;
  font-weight: 500;
}

/* Animations */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }

  .title {
    font-size: 1.75rem;
    flex-direction: column;
    gap: 0.5rem;
  }

  .title-icon {
    width: 2rem;
    height: 2rem;
  }

  .upload-card {
    padding: 2rem 1.5rem;
  }

  .file-inputs {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .chart-row {
    grid-template-columns: 1fr;
  }

  .chart-container {
    height: 300px;
  }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}