:root {
  --bg: #f1f5fb;
  --surface: #ffffff;
  --text: #1c2733;
  --muted: #5c6b7d;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --border: #dbe4f0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  padding: 24px;
}

.card {
  width: 100%;
  max-width: 560px;
  min-height: 580px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 48px 40px;
  text-align: center;
}

h1 {
  font-size: 1.5rem;
  margin: 0 0 4px;
}

h3 {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--muted);
  margin: 16px 0;
}

h4 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--muted);
  margin: 24px 0 8px;
  text-align: center;
}

.input-row {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

input[type="text"] {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  outline: none;
  background: var(--bg);
  color: var(--text);
  text-align: center;
}

input[type="text"]:focus {
  border-color: var(--accent);
}

button {
  background: none;
  border: none;
  padding: 4px 2px;
  color: var(--accent);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}

button:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

#short-button {
  padding: 10px 16px;
}

.links-container {
  text-align: center;
}

#user-links {
  list-style: none;
  margin: 0;
  padding: 0 4px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  max-height: 260px;
  overflow-y: auto;
}

#user-links::-webkit-scrollbar {
  width: 6px;
}

#user-links::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 6px;
}

#user-links li {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  width: 100%;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--muted);
  line-height: 1.4;
}

#user-links li:last-child {
  border-bottom: none;
}