:root {
  --bg-color: #0f172a;
  --surface-color: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent: #818cf8;
  --accent-hover: #a5b4fc;
  --focus-ring: #facc15;
  --error: #fb7185;
  --border: #334155;
}

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

body {
  font-family:
    system-ui,
    -apple-system,
    sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  padding: 1.5rem;
}

main {
  max-width: 700px;
  margin: 0 auto;
}

:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 4px;
}

h1 {
  font-size: 2rem;
  margin-bottom: 2rem;
  text-align: center;
  color: var(--accent);
}

h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

section,
fieldset {
  background-color: var(--surface-color);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  margin-bottom: 2rem;
}

#user-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

select {
  padding: 0.75rem;
  border-radius: 8px;
  background-color: var(--bg-color);
  color: var(--text-primary);
  border: 1px solid var(--border);
  font-size: 1rem;
  width: 100%;
}

#status-message {
  font-weight: bold;
  color: var(--accent);
  margin-top: 0.5rem;
}

#bookmarks-container {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

article {
  background-color: var(--surface-color);
  border: 1px solid var(--border);
  border-left: 5px solid var(--accent);
  padding: 1.25rem;
  border-radius: 8px;
}

.bookmark-title {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 4px;
  font-size: 1.25rem;
  display: block;
  margin-bottom: 0.5rem;
}

.bookmark-description {
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.bookmark-timestamp {
  display: block;
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

.actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

button {
  min-height: 48px;
  min-width: 48px;
  padding: 0 1.25rem;
  cursor: pointer;
  background-color: #2d3748;
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-weight: 600;
  transition: background-color 0.2s;
}

button:hover {
  background-color: #4a5568;
}

button[type="submit"] {
  background-color: var(--accent);
  color: var(--bg-color);
  width: 100%;
  margin-top: 1rem;
  border: none;
}

button[type="submit"]:hover {
  background-color: var(--accent-hover);
}

legend {
  font-weight: bold;
  color: var(--accent);
  padding: 0 0.5rem;
}

.field {
  margin-bottom: 1.25rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

input,
textarea {
  width: 100%;
  padding: 0.75rem;
  border-radius: 6px;
  background-color: var(--bg-color);
  color: var(--text-primary);
  border: 1px solid var(--border);
  font-size: 1rem;
}

textarea {
  min-height: 100px;
  resize: vertical;
}

button:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}