:root {
  --bg-top: #f8fbff;
  --bg-bottom: #e9f1ff;
  --panel: #ffffff;
  --text: #10213d;
  --subtext: #48617f;
  --line: #cfe0f8;
  --primary: #1459c7;
  --primary-hover: #0f47a0;
  --danger: #b42318;
  --success: #027a48;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: "Segoe UI", Tahoma, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 15% 15%, var(--bg-top), var(--bg-bottom) 70%);
}

.auth-shell {
  width: min(94vw, 520px);
}

.auth-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px;
  box-shadow: 0 18px 44px rgba(22, 57, 112, 0.15);
}

.back-link {
  font-weight: 600;
  color: #0f47a0;
  text-decoration: none;
}

h1 {
  margin: 12px 0 4px;
  font-size: 1.45rem;
}

.subtitle {
  margin: 0 0 14px;
  color: var(--subtext);
}

.auth-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 14px;
}

.tab {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f4f8ff;
  color: #26476f;
  padding: 10px;
  font-weight: 700;
  cursor: pointer;
}

.tab.is-active {
  color: #fff;
  border-color: var(--primary);
  background: linear-gradient(130deg, #1d63d4, #0f47a0);
}

.auth-form {
  display: grid;
  gap: 8px;
}

.auth-form.is-hidden {
  display: none;
}

label {
  font-size: 0.92rem;
  font-weight: 600;
}

input {
  width: 100%;
  border: 1px solid #bfd3f1;
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 1rem;
  outline: none;
  background: #fcfdff;
}

input:focus {
  border-color: #79a5eb;
  box-shadow: 0 0 0 3px rgba(21, 93, 202, 0.18);
}

.primary-btn {
  margin-top: 6px;
  border: 0;
  border-radius: 10px;
  padding: 11px 14px;
  font-weight: 700;
  font-size: 0.96rem;
  color: #fff;
  cursor: pointer;
  background: linear-gradient(135deg, var(--primary), #0e4398);
}

.primary-btn:hover {
  background: linear-gradient(135deg, var(--primary-hover), #0b387f);
}

.message {
  min-height: 20px;
  margin: 12px 0 2px;
  font-weight: 600;
}

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

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

.note {
  margin: 6px 0 0;
  font-size: 0.88rem;
  color: #5f7593;
}

.admin-login-note {
  margin: 0 0 4px;
  font-size: 0.92rem;
  line-height: 1.5;
  color: #48617f;
}

.test-accounts {
  margin-top: 14px;
  border-top: 1px dashed var(--line);
  padding-top: 10px;
}

.test-accounts h2 {
  margin: 0 0 6px;
  font-size: 1rem;
}

#seedList {
  margin: 0;
  padding-left: 18px;
  color: #2b476a;
}

#seedList li {
  margin: 4px 0;
  font-size: 0.9rem;
}

@media (max-width: 520px) {
  .auth-panel {
    border-radius: 12px;
    padding: 14px;
  }

  h1 {
    font-size: 1.25rem;
  }

  .auth-tabs {
    grid-template-columns: 1fr;
  }
}