:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --ink: #1c2333;
  --muted: #5b6478;
  --line: #e2e6f0;
  --accent: #4f46e5;
  --accent-dark: #4338ca;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.9em;
  background: #eef1f8;
  border-radius: 4px;
  padding: 0.1em 0.35em;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.5rem;
  background: var(--card);
  border-bottom: 1px solid var(--line);
}

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

.app-titles p {
  margin: 0.15rem 0 0;
  font-size: 0.875rem;
  color: var(--muted);
}

.app-titles p a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

.app-titles p a:hover {
  text-decoration: underline;
}

.app-source {
  font-size: 0.875rem;
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.35rem 0.75rem;
}

.app-source:hover {
  border-color: var(--accent);
}

.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 1px 2px rgba(20, 30, 60, 0.04);
  overflow: hidden;
}

.card-header {
  padding: 1.25rem 1.5rem 0;
}

.card-header h2 {
  margin: 0;
  font-size: 1.1rem;
}

.card-header p {
  margin: 0.35rem 0 0;
  font-size: 0.875rem;
  color: var(--muted);
}

.card-body {
  padding: 1.25rem 1.5rem 1.5rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.btn {
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.55rem 1rem;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}

.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: #fff;
}

.box {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 140px;
  border: 2px solid var(--line);
  border-radius: 12px;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--muted);
  background: #fbfcff;
  transition: background 0.2s, border-color 0.2s;
}

.status {
  margin: 1rem 0 0;
  min-height: 1.25rem;
  font-size: 0.875rem;
  color: var(--muted);
}