:root {
    --primary: #1e3a8a;
    --primary-hover: #1d4ed8;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --border: #e2e8f0;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }
body { background-color: var(--bg); color: var(--text); padding: 20px; }

.container { max-width: 1100px; margin: 0 auto; }
header { text-align: center; margin-bottom: 25px; padding-bottom: 15px; border-bottom: 2px solid var(--border); }
header h1 { color: var(--primary); font-size: 1.8rem; }
header p { color: #64748b; font-size: 0.95rem; margin-top: 5px; font-weight: 600; }

/* Abas de Navegação */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}
.tab-btn {
    flex-shrink: 0;
    padding: 10px 20px;
    border: none;
    background: #e2e8f0;
    cursor: pointer;
    border-radius: 6px 6px 0 0;
    font-weight: bold;
    color: #475569;
    white-space: nowrap;
}
.tab-btn.active { background: var(--primary); color: white; }

/* Seções / Cards */
.tab-content { display: none; }
.tab-content.active { display: block; }

.card { background: var(--card-bg); padding: 20px; border-radius: 8px; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1); margin-bottom: 20px; min-width: 0; }
.card-aluno { flex: 1.2; }
.card-tipo { flex: 0.8; }

@media (max-width: 700px) {
    .card-aluno, .card-tipo { flex: 1 1 100%; }
}
.card h2 { color: var(--primary); font-size: 1.2rem; margin-bottom: 15px; border-bottom: 1px solid var(--border); padding-bottom: 8px; }

/* Formulários */
.form-group { margin-bottom: 15px; }
.form-row { display: flex; gap: 15px; flex-wrap: wrap; }
.form-row .form-group { flex: 1; min-width: 200px; }

label { display: block; margin-bottom: 5px; font-weight: 600; font-size: 0.9rem; }
input, select, textarea { width: 100%; padding: 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 0.95rem; }

button { background-color: var(--primary); color: white; padding: 10px 18px; border: none; border-radius: 6px; cursor: pointer; font-weight: 600; transition: 0.2s; }
button:hover { background-color: var(--primary-hover); }
button:disabled { opacity: 0.6; cursor: not-allowed; }
.btn-danger { background-color: #ef4444; }
.btn-danger:hover { background-color: #dc2626; }
.btn-success { background-color: #10b981; }
.btn-success:hover { background-color: #059669; }
.btn-secondary { background-color: #64748b; }
.btn-secondary:hover { background-color: #475569; }

/* Grupos de alunos por turma */
.turma-group {
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-bottom: 10px;
    overflow: hidden;
}
.turma-group summary {
    cursor: pointer;
    padding: 10px 12px;
    background: #f1f5f9;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
}
.turma-group summary::-webkit-details-marker { display: none; }
.turma-group summary::before {
    content: '▸';
    font-size: 0.8em;
    transition: transform 0.15s;
}
.turma-group[open] summary::before { transform: rotate(90deg); }
.turma-group .badge {
    background: var(--primary);
    color: white;
    border-radius: 999px;
    padding: 1px 9px;
    font-size: 0.75rem;
    font-weight: 600;
}
.turma-group table { margin-top: 0; }
.turma-group .table-wrap { padding: 0 12px; }

.edit-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; padding: 4px 0; }
.edit-row input, .edit-row select { flex: 1; min-width: 140px; width: auto; }
.edit-row button { padding: 8px 12px; font-size: 0.85rem; white-space: nowrap; }

/* Tabelas */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table { width: 100%; border-collapse: collapse; margin-top: 15px; }
th, td { padding: 12px; text-align: left; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
th { background-color: #f1f5f9; color: #334155; }

/* Status offline */
#offlineBanner {
    display: none;
    background: #f59e0b;
    color: white;
    text-align: center;
    padding: 8px;
    border-radius: 6px;
    margin-bottom: 15px;
    font-weight: 600;
    font-size: 0.9rem;
}
#offlineBanner.show { display: block; }

/* Telas pequenas (celulares) */
@media (max-width: 480px) {
    body { padding: 12px; }
    header h1 { font-size: 1.4rem; }
    header p { font-size: 0.85rem; }
    .card { padding: 15px; }
    .tab-btn { padding: 10px 14px; font-size: 0.85rem; }
    th, td { padding: 8px; font-size: 0.85rem; }
}

/* Estilo para Impressão / Relatórios */
@media print {
    body { background: white; padding: 0; }
    .tabs, button, form, .no-print, #offlineBanner { display: none !important; }
    .card { box-shadow: none; border: none; padding: 0; }
    .container { max-width: 100%; }
}