:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --border: #e2e5ea;
  --text: #1b1f24;
  --muted: #6b727c;
  --accent: #3b6ef6;
  --error: #c02626;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171b;
    --surface: #1c2026;
    --border: #2b313a;
    --text: #e8eaed;
    --muted: #9aa2ad;
    --accent: #6f96ff;
    --error: #ff7b7b;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 2rem 1.25rem 4rem;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  max-width: 900px;
  margin: 0 auto 2rem;
}

h1 {
  font-size: 1.5rem;
  margin: 0;
  letter-spacing: -0.01em;
}

main {
  max-width: 900px;
  margin: 0 auto;
}

main.centered {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 70vh;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}

.card {
  display: block;
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, transform 0.15s;
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.card h2 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.card p {
  margin: 0 0 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.card-url {
  font-size: 0.8rem;
  color: var(--accent);
  word-break: break-all;
}

.empty {
  color: var(--muted);
}

.login {
  width: 100%;
  max-width: 320px;
  padding: 1.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.login h1 {
  margin: 0 0 1.25rem;
  font-size: 1.25rem;
}

label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.85rem;
  color: var(--muted);
}

input[type="password"] {
  width: 100%;
  padding: 0.6rem 0.7rem;
  margin-bottom: 1rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1rem;
}

input[type="password"]:focus,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

button {
  width: 100%;
  padding: 0.6rem 1rem;
  background: var(--accent);
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 0.95rem;
  cursor: pointer;
}

header button {
  width: auto;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}

header button:hover {
  color: var(--text);
  border-color: var(--accent);
}

.error {
  margin: 0 0 1rem;
  padding: 0.5rem 0.7rem;
  border-radius: 8px;
  background: color-mix(in srgb, var(--error) 12%, transparent);
  color: var(--error);
  font-size: 0.85rem;
}