Modernize docs page with professional documentation styling

docs/docs.css

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+/**
+ * Documentation Page Stylesheet
+ * Custom styles for the callsign.js documentation/demo page
+ */
+
+:root {
+  --primary-color: #0066cc;
+  --secondary-color: #6c757d;
+  --success-color: #28a745;
+  --code-bg: #f5f5f5;
+  --border-color: #e0e0e0;
+  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
+  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
+  --radius: 8px;
+}
+
+@media (prefers-color-scheme: dark) {
+  :root {
+    --primary-color: #4d9fff;
+    --secondary-color: #adb5bd;
+    --code-bg: #2d2d2d;
+    --border-color: #404040;
+  }
+}
+
+/* Hero Section */
+.hero {
+  text-align: center;
+  padding: 3rem 1rem;
+  margin-bottom: 2rem;
+}
+
+.hero h1 {
+  font-size: 3rem;
+  margin-bottom: 0.5rem;
+  color: var(--primary-color);
+  background: linear-gradient(135deg, var(--primary-color), var(--success-color));
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+  background-clip: text;
+}
+
+/* Fallback for browsers without background-clip support or high contrast mode */
+@supports not (background-clip: text) or not (-webkit-background-clip: text) {
+  .hero h1 {
+    color: var(--primary-color);
+    background: none;
+  }
+}
+
+.hero .subtitle {
+  font-size: 1.5rem;
+  font-weight: 600;
+  margin-bottom: 0.5rem;
+  opacity: 0.9;
+}
+
+.hero .tagline {
+  font-size: 1.1rem;
+  opacity: 0.7;
+  margin-bottom: 2rem;
+}
+
+.header-links {
+  display: flex;
+  gap: 1rem;
+  justify-content: center;
+  flex-wrap: wrap;
+  margin-top: 2rem;
+}
+
+/* Buttons */
+.btn {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.5rem;
+  padding: 0.75rem 1.5rem;
+  border-radius: var(--radius);
+  text-decoration: none;
+  font-weight: 500;
+  transition: all 0.2s;
+  border: 2px solid transparent;
+}
+
+.btn-primary {
+  background-color: var(--primary-color);
+  color: white;
+}
+
+.btn-primary:hover {
+  transform: translateY(-2px);
+  box-shadow: var(--shadow-md);
+}
+
+.btn-secondary {
+  border: 2px solid var(--primary-color);
+  color: var(--primary-color);
+}
+
+.btn-secondary:hover {
+  background-color: var(--primary-color);
+  color: white;
+}
+
+/* Sections */
+section {
+  margin-bottom: 4rem;
+  scroll-margin-top: 2rem;
+}
+
+section h2 {
+  font-size: 2rem;
+  margin-bottom: 1.5rem;
+  padding-bottom: 0.5rem;
+  border-bottom: 3px solid var(--primary-color);
+}
+
+/* Demo Cards */
+.demo-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
+  gap: 2rem;
+  margin-top: 2rem;
+}
+
+.demo-card {
+  background: var(--code-bg);
+  padding: 1.5rem;
+  border-radius: var(--radius);
+  border: 1px solid var(--border-color);
+}
+
+.demo-card h3 {
+  margin-top: 0;
+  color: var(--primary-color);
+}
+
+/* Feature Grid */
+.feature-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
+  gap: 1.5rem;
+  margin-top: 2rem;
+}
+
+.feature-card {
+  padding: 1.5rem;
+  border-radius: var(--radius);
+  border: 1px solid var(--border-color);
+  transition: all 0.2s;
+  text-align: center;
+}
+
+.feature-card:hover {
+  box-shadow: var(--shadow-md);
+  transform: translateY(-4px);
+  border-color: var(--primary-color);
+}
+
+.feature-icon {
+  font-size: 3rem;
+  margin-bottom: 1rem;
+}
+
+.feature-card h3 {
+  color: var(--primary-color);
+  margin-bottom: 0.5rem;
+}
+
+.feature-card p {
+  margin: 0;
+  opacity: 0.8;
+  font-size: 0.95rem;
+}
+
+/* Getting Started Steps */
+.step {
+  margin-bottom: 2rem;
+  padding: 1.5rem;
+  background: var(--code-bg);
+  border-radius: var(--radius);
+  border-left: 4px solid var(--primary-color);
+}
+
+.step h3 {
+  margin-top: 0;
+  color: var(--primary-color);
+}
+
+/* Code Blocks */
+pre {
+  background: var(--code-bg);
+  padding: 1rem;
+  border-radius: var(--radius);
+  overflow-x: auto;
+  border: 1px solid var(--border-color);
+}
+
+code {
+  background: var(--code-bg);
+  padding: 0.2rem 0.4rem;
+  border-radius: 4px;
+  font-size: 0.9em;
+  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', 'Courier New', Courier, monospace;
+}
+
+pre code {
+  background: none;
+  padding: 0;
+}
+
+/* Tables */
+table {
+  width: 100%;
+  border-collapse: collapse;
+  margin-top: 1rem;
+}
+
+table th {
+  background: var(--code-bg);
+  padding: 0.75rem;
+  text-align: left;
+  border-bottom: 2px solid var(--border-color);
+}
+
+table td {
+  padding: 0.75rem;
+  border-bottom: 1px solid var(--border-color);
+}
+
+table tbody tr:hover {
+  background: var(--code-bg);
+}
+
+/* Footer */
+footer {
+  margin-top: 4rem;
+  padding: 2rem 0;
+  border-top: 1px solid var(--border-color);
+  text-align: center;
+}
+
+.footer-content p {
+  margin: 0.5rem 0;
+}
+
+.footer-content a {
+  color: var(--primary-color);
+  text-decoration: none;
+  margin: 0 0.5rem;
+}
+
+.footer-content a:hover {
+  text-decoration: underline;
+}
+
+/* Utilities */
+.muted {
+  opacity: 0.7;
+  font-style: italic;
+}
+
+/* Responsive */
+@media (max-width: 768px) {
+  .hero h1 {
+    font-size: 2rem;
+  }
+
+  .hero .subtitle {
+    font-size: 1.2rem;
+  }
+
+  .feature-grid,
+  .demo-grid {
+    grid-template-columns: 1fr;
+  }
+}