:root {
  --bg: #f3f4f6;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #111827;
  --error: #b91c1c;
  --focus: #2563eb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.shell.wide {
  align-items: flex-start;
  padding-top: 48px;
}

.card {
  width: 100%;
  max-width: 360px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 28px 24px 24px;
  display: grid;
  gap: 14px;
}

.card h1 {
  margin: 0 0 4px;
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.35;
}

label {
  display: grid;
  gap: 6px;
  font-size: 0.875rem;
  color: var(--muted);
}

input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font: inherit;
  color: var(--text);
  background: #fff;
}

input:focus {
  outline: 2px solid var(--focus);
  outline-offset: 1px;
  border-color: transparent;
}

button {
  margin-top: 4px;
  padding: 10px 14px;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

button:hover {
  opacity: 0.92;
}

.error {
  margin: 0;
  padding: 8px 10px;
  border-radius: 6px;
  background: #fef2f2;
  color: var(--error);
  font-size: 0.875rem;
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}

.brand {
  font-weight: 600;
}

.linkish {
  margin: 0;
  padding: 6px 10px;
  background: transparent;
  color: var(--muted);
  font-weight: 500;
}

.linkish:hover {
  color: var(--text);
  opacity: 1;
}

.panel {
  width: 100%;
  max-width: 720px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
}

.panel h1 {
  margin: 0 0 8px;
  font-size: 1.35rem;
}

.muted {
  margin: 0;
  color: var(--muted);
}