:root {
  --color-text: #1b1b1b;
  --color-bg: white;
  --color-surface: #eee;
  --color-surface-alt: white;
  --color-border: #bbb;
  --color-border-light: #ddd;
  --color-muted: #555;
  --color-accent: #0067b8;
  --color-accent-hover: #005a9e;
  --color-accent-active: #004578;
  --color-accent-focus-ring: rgba(0, 103, 184, 0.2);
  --color-code-bg: #f0f0f0;
  --color-kbd-border: #ccc;
  --color-kbd-shadow: #bbb;
  --color-warning-bg: #fff3cd;
  --color-warning-border: #ffecb5;
  --color-warning-text: #664d03;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-text: #e0e0e0;
    --color-bg: #1e1e1e;
    --color-surface: #2a2a2a;
    --color-surface-alt: #333;
    --color-border: #555;
    --color-border-light: #444;
    --color-muted: #aaa;
    --color-accent: #4fc3f7;
    --color-accent-hover: #81d4fa;
    --color-accent-active: #29b6f6;
    --color-accent-focus-ring: rgba(79, 195, 247, 0.25);
    --color-code-bg: #2d2d2d;
    --color-kbd-border: #555;
    --color-kbd-shadow: #444;
    --color-warning-bg: #3e3219;
    --color-warning-border: #5c4a1c;
    --color-warning-text: #ffd54f;
  }
}

* {
  box-sizing: border-box;
}

html,
input,
textarea,
button {
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  font-size: 16px;
  font-family: system-ui, sans-serif;
  font-weight: 400;
}

html {
  min-block-size: 100vh;
}

body {
  max-inline-size: 800px;
  margin-inline: auto;
  margin-block: 0;
  padding-block: 2rem;
  padding-inline: 2rem;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

h1 {
  margin-block: 2rem;
  font-size: 1.75rem;
}

body > p {
  margin-block: 2rem;
}

h2 {
  font-size: 1.3rem;
  margin-block: 0 1rem;
  margin-inline: 0;
  border-block-end: 1px solid var(--color-border-light);
  padding-block-end: 1rem;
}

h3 {
  font-size: 1rem;
  margin-block-end: 0.25rem;
}

code,
kbd {
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.9em;
  background: var(--color-code-bg);
  padding-block: 0.15em;
  padding-inline: 0.35em;
  border-radius: 3px;
}

.demo-section code {
  background: var(--color-surface-alt);
}

kbd {
  border: 1px solid var(--color-kbd-border);
  box-shadow: 0 1px 0 var(--color-kbd-shadow);
}

a {
  color: var(--color-accent);
}

.warning {
  background: var(--color-warning-bg);
  border: 1px solid var(--color-warning-border);
  border-radius: 6px;
  padding-block: 0.75rem;
  padding-inline: 1rem;
  margin-block: 1rem;
  color: var(--color-warning-text);
}

.demo-section {
  margin-block-end: 2rem;
  background: var(--color-surface);
  padding-block: 1rem;
  padding-inline: 1rem;
  border-radius: 6px;
}

.form-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-block-end: 0.75rem;
}

.form-row label {
  font-weight: 600;
  white-space: nowrap;
  min-inline-size: 5rem;
}

.form-row input {
  flex: 1;
}

input[type="text"],
input[type="email"] {
  inline-size: 100%;
  padding-block: 0.6rem;
  padding-inline: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 1rem;
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color 0.15s;
}

input[type="text"]:focus,
input[type="email"]:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-accent-focus-ring);
}

/* Custom element submit buttons */
my-submit-button,
override-submit-button,
implicit-submit-button,
a11y-submit-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding-block: 0.5rem;
  padding-inline: 1.25rem;
  border: 2px solid var(--color-accent);
  border-radius: 6px;
  background: var(--color-accent);
  color: var(--color-bg);
  font-size: 0.95rem;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
  user-select: none;
}

my-submit-button:hover,
override-submit-button:hover,
implicit-submit-button:hover,
a11y-submit-button:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

my-submit-button:active,
override-submit-button:active,
implicit-submit-button:active,
a11y-submit-button:active {
  background: var(--color-accent-active);
  border-color: var(--color-accent-active);
}

my-submit-button:focus-visible,
override-submit-button:focus-visible,
implicit-submit-button:focus-visible,
a11y-submit-button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.button-group {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.output {
  margin-block-start: 1rem;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding-block: 0.75rem;
  padding-inline: 1rem;
}

.output h3 {
  margin-block: 0 0.5rem;
  margin-inline: 0;
  font-size: 0.9rem;
  color: var(--color-muted);
}

.output pre {
  margin-block: 0;
  margin-inline: 0;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.85rem;
  white-space: pre-wrap;
  word-break: break-word;
}

.info-text {
  font-size: 0.9rem;
  color: var(--color-muted);
  min-block-size: 1.4rem;
}

ul {
  padding-inline-start: 1.5rem;
  margin-block: 0.5rem;
}

li {
  margin-block-end: 0.25rem;
}