:root {
  --bg: #0f1220;
  --bg-soft: #171b2e;
  --card: #1d2238;
  --border: #2c3252;
  --text: #e8ebf6;
  --muted: #9aa3c4;
  --primary: #6b8afd;
  --primary-hover: #5577f0;
  --accent: #45d6a8;
  --danger: #ff6b7a;
  --radius: 14px;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--text);
  background: radial-gradient(
      1200px 600px at 80% -10%,
      rgba(107, 138, 253, 0.18),
      transparent
    ),
    radial-gradient(
      900px 500px at -10% 110%,
      rgba(69, 214, 168, 0.12),
      transparent
    ),
    var(--bg);
}

.shell {
  max-width: 920px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 24px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 18px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #0f1220;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.brand-text strong {
  color: var(--primary);
}

.content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card {
  width: 100%;
  max-width: 560px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
}

.centered {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.title {
  font-size: 28px;
  margin: 0 0 8px;
}

.subtitle {
  color: var(--muted);
  margin: 0 0 24px;
  line-height: 1.5;
}

.form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-label {
  font-size: 13px;
  color: var(--muted);
}

input {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 15px;
  outline: none;
  transition: border-color 0.15s ease;
}

input:focus {
  border-color: var(--primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s ease, border-color 0.15s ease, opacity 0.15s ease;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--primary);
  color: #0f1220;
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

.btn-secondary {
  margin-top: 16px;
  width: 100%;
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}

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

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--muted);
  padding: 8px 14px;
  font-size: 14px;
}

.btn-ghost:hover {
  color: var(--text);
  border-color: var(--primary);
}

.error {
  margin: 4px 0 0;
  padding: 10px 12px;
  background: rgba(255, 107, 122, 0.12);
  border: 1px solid rgba(255, 107, 122, 0.4);
  border-radius: 10px;
  color: var(--danger);
  font-size: 14px;
}

.note {
  margin: 20px 0 0;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

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

/* Dashboard */
.welcome {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 20px;
}

.welcome .title {
  margin: 0;
}

.badge {
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: rgba(107, 138, 253, 0.18);
  color: var(--primary);
  border: 1px solid rgba(107, 138, 253, 0.4);
}

.badge.teacher {
  background: rgba(69, 214, 168, 0.16);
  color: var(--accent);
  border-color: rgba(69, 214, 168, 0.4);
}

.profile {
  margin: 0 0 24px;
  display: grid;
  gap: 10px;
}

.profile-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.profile-row dt {
  color: var(--muted);
  font-size: 14px;
}

.profile-row dd {
  margin: 0;
  font-weight: 600;
}

.grid {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

@media (min-width: 480px) {
  .grid {
    grid-template-columns: 1fr 1fr;
  }
}

.access-card {
  padding: 18px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.access-card.full {
  grid-column: 1 / -1;
}

.access-card h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.access-card p {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.5;
}

.status-line {
  margin-top: 10px;
  font-size: 13px;
  font-weight: 600;
}

.status-ok {
  color: var(--accent);
}

.status-bad {
  color: var(--danger);
}

.status-pending {
  color: var(--muted);
}

.footer {
  margin-top: 32px;
  text-align: center;
  font-size: 12px;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}