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

:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-2: #334155;
  --border: #475569;
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --accent: #818cf8;
  --accent-hover: #6366f1;
  --success: #34d399;
  --error: #f87171;
  --warning: #fbbf24;
  --info: #60a5fa;
  --radius: 8px;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --mono: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', monospace;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

.header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
}

.header-inner {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 1rem;
  background: var(--accent);
  color: #fff;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-weight: 800;
}

.tagline {
  color: var(--text-dim);
  font-size: 0.875rem;
  text-align: center;
  margin-top: 0.25rem;
}

.site-nav {
  display: flex;
  gap: 0.75rem;
}

.site-nav a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.15s;
}

.site-nav a:hover { color: var(--accent); }

.main {
  max-width: 1000px;
  margin: 0 auto;
  padding: 1.5rem;
}

.url-input-section {
  margin-bottom: 1.5rem;
}

.input-row {
  display: flex;
  gap: 0.5rem;
}

.input-row input {
  flex: 1;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--mono);
  font-size: 1rem;
  transition: border-color 0.15s;
}

.input-row input:focus {
  outline: none;
  border-color: var(--accent);
}

.input-row input::placeholder {
  color: var(--text-dim);
}

.status-msg {
  font-size: 0.85rem;
  padding: 0.35rem 0;
  min-height: 1.5em;
}

.status-msg.success { color: var(--success); }
.status-msg.error { color: var(--error); }
.status-msg.info { color: var(--info); }

.btn {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.btn:hover { background: var(--border); }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent-hover);
  color: #fff;
  font-weight: 600;
}

.btn-primary:hover { background: var(--accent-hover); }

.btn-large {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
}

.btn-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.hidden { display: none; }

.results { animation: fadeIn 0.3s ease; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.score-section {
  display: flex;
  align-items: center;
  gap: 2rem;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border);
}

.score-circle {
  position: relative;
  width: 120px;
  height: 120px;
  flex-shrink: 0;
}

.score-circle svg {
  width: 120px;
  height: 120px;
  transform: rotate(-90deg);
}

.score-bg {
  fill: none;
  stroke: var(--surface-2);
  stroke-width: 8;
}

.score-fill {
  fill: none;
  stroke: var(--accent);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: 326.73;
  stroke-dashoffset: 326.73;
  transition: stroke-dashoffset 1s ease, stroke 0.3s;
}

.score-text {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.score-number {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
}

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

.score-summary {
  flex: 1;
}

.score-summary h2 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.score-summary p {
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.5;
}

.categories {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.category {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1rem;
  border: 1px solid var(--border);
}

.category-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.category-title {
  font-size: 0.95rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.category-score {
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.category-score.good { background: rgba(52,211,153,0.15); color: var(--success); }
.category-score.ok { background: rgba(251,191,36,0.15); color: var(--warning); }
.category-score.bad { background: rgba(248,113,113,0.15); color: var(--error); }

.category-items {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.category-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.category-item .icon {
  font-size: 0.75rem;
  width: 16px;
  text-align: center;
  flex-shrink: 0;
}

.category-item .icon.pass { color: var(--success); }
.category-item .icon.warn { color: var(--warning); }
.category-item .icon.fail { color: var(--error); }

.category-item .value {
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.8rem;
}

.suggestions-section {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border);
}

.suggestions-section h2 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.suggestions-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.suggestion {
  padding: 0.75rem 1rem;
  background: var(--bg);
  border-radius: var(--radius);
  border-left: 3px solid var(--warning);
  font-size: 0.9rem;
  line-height: 1.5;
}

.suggestion.high { border-left-color: var(--error); }
.suggestion.medium { border-left-color: var(--warning); }
.suggestion.low { border-left-color: var(--info); }

.suggestion-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.suggestion-desc {
  color: var(--text-dim);
  font-size: 0.85rem;
}

.export-section {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border);
}

.export-section h2 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.affiliate-section {
  margin: 2rem 0;
  padding: 1.25rem;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.affiliate-section h3 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

.affiliate-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.affiliate-links a {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.5rem 0.75rem;
  background: var(--bg);
  border-radius: var(--radius);
  transition: background 0.15s;
}

.affiliate-links a:hover {
  background: var(--surface-2);
  text-decoration: underline;
}

.features-section {
  margin: 2rem 0;
}

.features-section h2 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  text-align: center;
}

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

.feature-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.25rem;
  border: 1px solid var(--border);
}

.feature-icon {
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  background: rgba(129,140,248,0.1);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 0.75rem;
}

.feature-card h3 {
  font-size: 1rem;
  margin-bottom: 0.35rem;
}

.feature-card p {
  color: var(--text-dim);
  font-size: 0.85rem;
  line-height: 1.5;
}

.footer {
  text-align: center;
  padding: 2rem 1rem;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.85rem;
}

.footer a {
  color: var(--accent);
  text-decoration: none;
}

.footer a:hover { text-decoration: underline; }

.footer-links {
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
}

.footer-note {
  font-size: 0.75rem;
  color: var(--text-dim);
  opacity: 0.7;
}

.loading-spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid var(--surface-2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin-right: 0.5rem;
  vertical-align: middle;
}

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

@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    text-align: center;
  }

  .site-nav { justify-content: center; }

  .score-section {
    flex-direction: column;
    text-align: center;
  }

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

  .input-row {
    flex-direction: column;
  }

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