feat: add responsive professional information layer

src/styles/base.css

@@ -0,0 +1,121 @@
+* {
+  box-sizing: border-box;
+}
+
+html {
+  min-width: 0;
+  background: var(--canvas);
+  color: var(--text);
+  font-family: var(--sans);
+  font-size: 100%;
+  line-height: 1.55;
+  scroll-behavior: auto;
+  text-size-adjust: 100%;
+}
+
+body {
+  min-width: 0;
+  min-height: 100vh;
+  margin: 0;
+  overflow-wrap: anywhere;
+  background: var(--canvas);
+}
+
+button,
+input,
+textarea,
+select {
+  font: inherit;
+}
+
+a {
+  color: var(--cyan);
+  overflow-wrap: anywhere;
+  text-decoration-color: color-mix(in srgb, currentcolor 55%, transparent);
+  text-underline-offset: 0.18em;
+}
+
+a:hover {
+  color: var(--text);
+  text-decoration-color: currentcolor;
+}
+
+a:focus-visible,
+button:focus-visible,
+input:focus-visible,
+textarea:focus-visible,
+select:focus-visible,
+[tabindex]:focus-visible {
+  outline: 3px solid var(--focus);
+  outline-offset: 3px;
+}
+
+::selection {
+  background: var(--amber);
+  color: #14100a;
+}
+
+h1,
+h2,
+h3,
+p,
+dl,
+ul,
+ol,
+figure {
+  margin-block: 0;
+}
+
+h1,
+h2,
+h3 {
+  color: var(--text);
+  font-weight: 680;
+  letter-spacing: -0.025em;
+  line-height: 1.08;
+  text-wrap: balance;
+}
+
+p,
+li,
+dd,
+dt,
+a {
+  max-inline-size: 72ch;
+}
+
+svg,
+img,
+video,
+canvas {
+  display: block;
+  max-inline-size: 100%;
+}
+
+.skip-link {
+  position: fixed;
+  z-index: 10;
+  inset: var(--space-2) auto auto var(--space-2);
+  min-block-size: 44px;
+  padding: var(--space-1) var(--space-2);
+  transform: translateY(-160%);
+  background: var(--amber);
+  color: #171006;
+  font-weight: 700;
+  transition: transform var(--transition);
+}
+
+.skip-link:focus {
+  transform: translateY(0);
+}
+
+@media (prefers-reduced-motion: reduce) {
+  *,
+  *::before,
+  *::after {
+    scroll-behavior: auto !important;
+    transition-duration: 0.001s !important;
+    animation-duration: 0.001s !important;
+    animation-iteration-count: 1 !important;
+  }
+}