:root {
  --color-bg: #f4f6f8;
  --color-card: #ffffff;
  --color-text: #1f2937;
  --color-muted: #6b7280;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-error: #dc2626;
  --color-success: #16a34a;
  --color-border: #e5e7eb;
}

* {
  box-sizing: border-box;
}

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

.card {
  background: var(--color-card);
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 8px 24px rgba(0, 0, 0, 0.06);
  padding: 2.5rem;
  width: 100%;
  max-width: 420px;
}

.card h1 {
  margin: 0 0 0.25rem;
  font-size: 1.5rem;
}

.card .subtitle {
  margin: 0 0 1.5rem;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.field {
  margin-bottom: 1.1rem;
}

.field label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.field input {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.15s ease;
}

.field input:focus {
  outline: none;
  border-color: var(--color-primary);
}

button.primary,
.btn-link.primary {
  display: block;
  width: 100%;
  padding: 0.7rem;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  box-sizing: border-box;
  cursor: pointer;
  transition: background 0.15s ease;
}

button.primary:hover,
.btn-link.primary:hover {
  background: var(--color-primary-hover);
}

button.secondary {
  width: 100%;
  padding: 0.6rem;
  margin-top: 0.75rem;
  background: transparent;
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 0.9rem;
  cursor: pointer;
}

.message {
  margin-top: 1rem;
  font-size: 0.9rem;
  min-height: 1.2rem;
}

.message.error {
  color: var(--color-error);
}

.message.success {
  color: var(--color-success);
}

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.25rem;
}

.card.wide {
  max-width: 900px;
}

.admin-link {
  display: block;
  text-align: center;
  margin-top: 0.75rem;
  font-size: 0.9rem;
  color: var(--color-primary);
}

.submissions-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.submissions-table th,
.submissions-table td {
  text-align: left;
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.submissions-table th {
  color: var(--color-muted);
  font-weight: 600;
}