:root {
  --bg: #eef2f7;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --text: #0f172a;
  --muted: #64748b;
  --border: rgba(15, 23, 42, 0.1);
  --accent: #1d4ed8;
  --accent-dark: #1e40af;
  --accent-light: rgba(29, 78, 216, 0.08);
  --danger: #be123c;
  --danger-bg: #fff1f2;
  --warning-bg: #fffbeb;
  --radius: 18px;
  --radius-sm: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,0.07), 0 8px 28px rgba(15,23,42,0.07);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font);
  color: var(--text);
  line-height: 1.55;
  background:
    radial-gradient(ellipse at top left, rgba(29, 78, 216, 0.1) 0%, transparent 50%),
    linear-gradient(160deg, #eef2f7 0%, #e2eaf5 100%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem clamp(1rem, 3vw, 2.5rem);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar-brand h1 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.layout {
  width: min(1200px, calc(100% - 2rem));
  margin: 0 auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 1.75rem 0 3rem;
}

.grid { display: grid; gap: 1rem; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.eyebrow {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.35rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.card h2 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}

.notice {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 1rem;
}

.login-card {
  width: 100%;
  max-width: 680px;
  margin: auto;
}

.form-grid {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.25rem;
}

.grid.two .form-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

label {
  display: grid;
  gap: 0.3rem;
  font-size: 0.855rem;
  font-weight: 600;
  color: var(--text);
}

input,
select,
textarea {
  width: 100%;
  border: 1.5px solid #d1d9e6;
  border-radius: var(--radius-sm);
  padding: 0.62rem 0.85rem;
  font: inherit;
  font-size: 0.9rem;
  color: var(--text);
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
}

textarea { resize: vertical; }

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.12);
}

.check {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
}

.check input { width: auto; cursor: pointer; }

.span-2 { grid-column: span 2; }

.btn {
  border: none;
  border-radius: 999px;
  padding: 0.65rem 1.15rem;
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease, background 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  white-space: nowrap;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn.primary {
  color: #fff;
  background: var(--accent);
  box-shadow: 0 2px 10px rgba(29, 78, 216, 0.28);
}

.btn.primary:hover { background: var(--accent-dark); }

.btn.secondary {
  color: var(--text);
  background: #e2e8f0;
}

.btn.secondary:hover { background: #cbd5e1; }

.btn.danger {
  color: #fff;
  background: var(--danger);
}

.btn.danger:hover { background: #9f1239; }

.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-light);
  white-space: nowrap;
}

.badge.muted {
  color: var(--muted);
  background: #e2e8f0;
}

.role-tag {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.28rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 700;
}

.role-ALUNO     { background: #dbeafe; color: #1e40af; }
.role-PROFESSOR { background: #d1fae5; color: #065f46; }
.role-ADMIN     { background: #fce7f3; color: #9d174d; }

.demo-users {
  margin-top: 1.5rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 1px solid var(--border);
}

.demo-users h3 {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 0.65rem;
}

.demo-users ul {
  list-style: none;
  display: grid;
  gap: 0.45rem;
}

.demo-users li {
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.role-switch { margin-top: 1rem; }

.actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.85rem;
}

.summary {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  margin-top: 1rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 1px solid var(--border);
}

.summary div { display: grid; gap: 0.1rem; }
.summary strong { font-size: 2.1rem; font-weight: 800; line-height: 1; }
.summary span { color: var(--muted); font-size: 0.82rem; }

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 740px;
}

th {
  background: var(--surface-2);
  padding: 0.7rem 1rem;
  text-align: left;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}

td {
  padding: 0.85rem 1rem;
  font-size: 0.875rem;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: #f8fafc; }

.row-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.row-actions .btn {
  padding: 0.38rem 0.75rem;
  font-size: 0.78rem;
}

.priority {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.2rem 0.65rem;
  font-size: 0.78rem;
  font-weight: 700;
}

.priority.Baixa   { background: #f0fdf4; color: #166534; }
.priority.Média   { background: #fefce8; color: #854d0e; }
.priority.Alta    { background: #fff7ed; color: #9a3412; }
.priority.Crítica { background: var(--danger-bg); color: var(--danger); }

.status-badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.2rem 0.65rem;
  font-size: 0.78rem;
  font-weight: 700;
}

.status-Aberta     { background: #eff6ff; color: #1d4ed8; }
.status-Em-análise { background: #fffbeb; color: #b45309; }
.status-Resolvida  { background: #f0fdf4; color: #15803d; }

.internal-note {
  margin-top: 0.5rem;
  padding: 0.45rem 0.75rem;
  background: var(--warning-bg);
  border-left: 3px solid #f59e0b;
  border-radius: 0 6px 6px 0;
  font-size: 0.82rem;
  color: #92400e;
}

.user-list {
  display: grid;
  gap: 0.65rem;
  margin-top: 1rem;
}

.user-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 1rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  gap: 1rem;
  transition: box-shadow 0.15s;
}

.user-item:hover { box-shadow: var(--shadow-sm); }

.user-info { display: grid; gap: 0.1rem; }
.user-info strong { font-size: 0.9rem; }

.user-role-control {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
}

.role-select-admin {
  width: auto;
  padding: 0.38rem 0.65rem;
  font-size: 0.85rem;
  border-radius: 8px;
}

.log-list {
  display: grid;
  gap: 0.5rem;
  max-height: 340px;
  overflow-y: auto;
}

.log-item {
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  font-family: Consolas, "Cascadia Code", "Fira Code", monospace;
  font-size: 0.8rem;
  line-height: 1.55;
  color: #334155;
}

.hidden { display: none !important; }

.muted-text {
  color: var(--muted);
  font-size: 0.875rem;
}

.subtitle {
  color: var(--muted);
  font-size: 0.8rem;
  margin-top: 0.2rem;
}

.footer {
  width: min(1200px, calc(100% - 2rem));
  margin: 0 auto 2rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
}

@media (max-width: 850px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .topbar-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .grid.two,
  .grid.two .form-grid {
    grid-template-columns: 1fr;
  }

  .span-2 { grid-column: span 1; }

  .section-header { flex-direction: column; }

  .user-item {
    flex-direction: column;
    align-items: flex-start;
  }
}