:root {
  --bg-color: #0f172a;
  --panel-bg: #1e293b;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --border-color: #334155;

  --safe: #22c55e;
  --medium: #eab308;
  --high: #ef4444;

  --font-family: 'Inter', system-ui, sans-serif;
  --border-radius: 16px;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: var(--font-family);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 2rem 1rem;
}

.app-container {
  width: 100%;
  max-width: 760px;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

header {
  padding: 1.5rem 1.5rem 1rem;
  border-radius: var(--border-radius);
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid var(--border-color);
}

.logo {
  display: grid;
  gap: 0.75rem;
  align-items: center;
}

.logo h1 {
  font-size: 2rem;
  margin-bottom: 0.25rem;
}

.icon {
  font-size: 2.5rem;
}

.subtitle {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 560px;
}

.panel {
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1.75rem;
}

.panel-header h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.panel-header p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.input-panel {
  display: grid;
  gap: 1rem;
}

#urlInput {
  width: 100%;
  padding: 1rem 1.1rem;
  border-radius: 14px;
  border: 1px solid var(--border-color);
  background-color: #111827;
  color: var(--text-main);
  font-size: 1rem;
}

#urlInput:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.16);
}

.action-btn {
  background-color: var(--accent);
  color: #ffffff;
  border: none;
  padding: 1rem 1.25rem;
  border-radius: 14px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.action-btn:hover:not(:disabled) {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
}

.action-btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.message-box {
  min-height: 1.5rem;
  color: var(--text-main);
  font-size: 0.95rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.message-box.info {
  color: var(--accent);
}

.message-box.success {
  color: var(--safe);
}

.message-box.error {
  color: var(--high);
}

.loading {
  margin-top: 1rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.hidden {
  display: none !important;
}

.results-section {
  display: grid;
  gap: 1rem;
}

.result-card {
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1.5rem;
}

.result-header {
  margin-bottom: 1rem;
}

.result-header h3 {
  margin: 0;
  color: var(--text-main);
  font-size: 1.1rem;
}

.risk-score {
  font-size: 3.25rem;
  font-weight: 800;
  margin-top: 0.5rem;
}

.risk-score.safe {
  color: var(--safe);
}

.risk-score.medium {
  color: var(--medium);
}

.risk-score.high {
  color: var(--high);
}

.issues-list {
  list-style: disc inside;
  padding-left: 0;
  color: var(--text-main);
}

.issues-list li {
  padding: 0.35rem 0;
}

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

.explanation-text {
  color: var(--text-main);
  line-height: 1.7;
  white-space: pre-wrap;
}

footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.95rem;
}

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

@media (max-width: 640px) {
  .app-container {
    padding: 0;
  }

  .result-card,
  .panel,
  header {
    padding: 1.25rem;
  }
}

.placeholder-text {
  color: var(--text-muted);
  font-style: italic;
}

.response-text {
  text-align: left;
  line-height: 1.5;
  width: 100%;
}

.error-text {
  color: var(--high);
  text-align: left;
  width: 100%;
}

footer {
  text-align: center;
  margin-top: 2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

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

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

@media (max-width: 600px) {
  .metric-cards {
    grid-template-columns: 1fr;
  }
}