/* =========================
   CYBERPUNK COLOR SYSTEM
   ========================= */

:root {
  /* Core colors */
  --neon-yellow: #FCEE09;
  --cyan-blue: #00B3A4;

  /* Neutrals (for readability) */
  --bg-main: #0B0E11;
  --bg-panel: #12161C;
  --bg-hover: #1A1F27;

  --text-primary: #E6FDFB;
  --text-secondary: #9FDCD6;
  --text-muted: #6FAFA8;

  --border-subtle: rgba(0, 179, 164, 0.25);
  --border-strong: rgba(252, 238, 9, 0.6);

  --focus-ring: rgba(252, 238, 9, 0.4);
}

/* =========================
   BASE STYLES
   ========================= */

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
}

/* =========================
   TYPOGRAPHY
   ========================= */

h1, h2, h3, h4 {
  color: var(--neon-yellow);
  letter-spacing: 0.04em;
  margin-top: 1.6em;
}

h1 {
  font-size: 2rem;
  border-bottom: 2px solid var(--border-strong);
  padding-bottom: 0.4em;
}

h2 {
  font-size: 1.5rem;
}

p {
  color: var(--text-secondary);
  max-width: none;
}

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

/* =========================
   LINKS
   ========================= */

a {
  color: var(--cyan-blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

a:hover {
  color: var(--neon-yellow);
  border-bottom-color: var(--neon-yellow);
}

a:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--focus-ring);
}

/* =========================
   NAVIGATION
   ========================= */

nav {
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border-subtle);
}

nav ul {
  list-style: none;              /* remove bullets */
  margin: 0;
  padding: 0 1rem;
  display: flex;                 /* horizontal layout */
  gap: 0.5rem;
  justify-content: center;
}

nav li {
  margin: 0;
}

nav a {
  display: block;
  padding: 0.75rem 1rem;
  color: var(--text-secondary);
}

nav a:hover {
  background: var(--bg-hover);
  color: var(--neon-yellow);
}

/* =========================
   BUTTONS
   ========================= */

button,
.btn {
  background: transparent;
  color: var(--neon-yellow);
  border: 1px solid var(--neon-yellow);
  padding: 0.6rem 1.2rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  cursor: pointer;
}

button:hover,
.btn:hover {
  background: var(--neon-yellow);
  color: #000;
}

button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--focus-ring);
}

/* =========================
   CARDS / PANELS
   ========================= */

.card {
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  padding: 1.25rem;
  margin: 1.5rem 0;
}

.card-title {
  color: var(--neon-yellow);
  margin-top: 0;
}

/* =========================
   CODE BLOCKS
   ========================= */

pre,
code {
  font-family: "JetBrains Mono", "Fira Code", monospace;
}

pre {
  background: #050709;
  border-left: 4px solid var(--cyan-blue);
  padding: 1rem;
  overflow-x: auto;
}

code {
  color: var(--neon-yellow);
}

/* =========================
   FORMS
   ========================= */

input,
textarea,
select {
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 0.6rem;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--neon-yellow);
  box-shadow: 0 0 0 2px var(--focus-ring);
}

/* =========================
   FOOTER
   ========================= */

footer {
  margin-top: 4rem;
  padding: 2rem 1rem;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  text-align: center;
}