* {
  box-sizing: border-box;
}

:root {
  --bg: #12141a;
  --surface: #1c1e26;
  --surface-elevated: #24262e;
  --border: #2d3038;
  --text: #f0f1f4;
  --text-muted: #8a8d96;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --error: #ef4444;
  --chart-blue: #3b82f6;
  --chart-teal: #14b8a6;
  --chart-purple: #8b5cf6;
  --chart-amber: #f59e0b;
  --chart-green: #22c55e;
  --chart-pink: #ec4899;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

/* Top Navigation */
.top-nav {
  height: 56px;
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.logo-icon {
  width: 20px;
  height: 20px;
  color: var(--accent);
}

/* Main Content */
.main-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

/* Search */
.search-card {
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}

.search-row {
  display: flex;
  gap: 0.75rem;
  align-items: stretch;
}

.search-input-wrap {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 1rem;
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  pointer-events: none;
}

.search-input-wrap input {
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.75rem;
  font-size: 0.95rem;
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  outline: none;
  transition: border-color 0.2s;
}

.search-input-wrap input:focus {
  border-color: var(--accent);
}

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

#submit-btn {
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s;
}

#submit-btn:hover:not(:disabled) {
  background: var(--accent-hover);
}

#submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Loading */
.loading {
  text-align: center;
  padding: 2.5rem;
  margin-bottom: 1.5rem;
}

.loading p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 1rem 0 0;
}

.spinner {
  width: 32px;
  height: 32px;
  margin: 0 auto;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Error */
.error {
  padding: 1rem 1.25rem;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: 8px;
  color: var(--error);
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}

/* Stats Row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
}

.stat-icon {
  width: 40px;
  height: 40px;
  color: var(--accent);
  flex-shrink: 0;
}

.stat-content {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 600;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Results Grid */
.results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

@media (max-width: 700px) {
  .results-grid {
    grid-template-columns: 1fr;
  }
}

.keywords-card,
.chart-card {
  padding: 1.5rem;
}

.card-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 1rem;
}

#keywords-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

#keywords-list li {
  padding: 0.4rem 0.75rem;
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.85rem;
}

.chart-wrapper {
  position: relative;
  height: 260px;
  margin-bottom: 1rem;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.legend strong {
  color: var(--text);
}

.hidden {
  display: none !important;
}