:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #64748b;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #06b6d4;
    --bg: #f1f5f9;
    --card: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.screen {
    display: none;
    min-height: 100vh;
}

.screen.active {
    display: block;
}

/* Login */
.login-card {
    max-width: 420px;
    margin: 80px auto;
    background: var(--card);
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    text-align: center;
}

.login-card h1 {
    color: var(--primary);
    margin-bottom: 8px;
}

.login-card p {
    color: var(--text-muted);
    margin-bottom: 24px;
}

.login-card form {
    display: flex;
    flex-direction: column;
    gap: 12px;
    text-align: left;
}

.login-card label {
    font-weight: 600;
    font-size: 14px;
}

.login-card input {
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 16px;
}

.login-hint {
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    font-size: 13px;
    color: var(--text-muted);
}

/* Header */
.app-header {
    background: var(--card);
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 10;
}

.app-header h2 {
    font-size: 20px;
    color: var(--primary);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px;
}

/* Botões */
.btn-primary,
.btn-secondary,
.btn-danger,
.btn-warning {
    padding: 10px 18px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

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

.btn-secondary {
    background: var(--secondary);
    color: white;
}

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

.btn-warning {
    background: var(--warning);
    color: white;
}

button:hover {
    opacity: 0.9;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    border-bottom: 2px solid var(--border);
}

.tab-btn {
    padding: 12px 24px;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    color: var(--text-muted);
    font-weight: 600;
    cursor: pointer;
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Formulários */
.form-card {
    background: var(--card);
    padding: 28px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    max-width: 700px;
}

.form-card h3 {
    margin-bottom: 20px;
    color: var(--primary);
}

fieldset {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
}

legend {
    padding: 0 10px;
    font-weight: 700;
    color: var(--primary);
}

label {
    display: block;
    margin: 12px 0 6px;
    font-weight: 600;
    font-size: 14px;
}

input,
select,
textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.hint {
    color: var(--text-muted);
    font-size: 13px;
    margin-bottom: 12px;
}

.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

/* Filtros */
.filters {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.filters input,
.filters select {
    flex: 1;
    min-width: 200px;
}

/* Cards de visitas */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

.visita-card {
    background: var(--card);
    border-radius: 16px;
    padding: 20px;
    box-shadow: var(--shadow);
    border-left: 5px solid var(--primary);
}

.visita-card.confirmada {
    border-left-color: var(--success);
}

.visita-card.realizada {
    border-left-color: var(--info);
}

.visita-card.cancelada {
    border-left-color: var(--danger);
}

.visita-card h4 {
    color: var(--primary);
    margin-bottom: 8px;
}

.visita-card p {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.visita-card .status {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    margin-top: 10px;
}

.status.agendada { background: #dbeafe; color: #1e40af; }
.status.confirmada { background: #dcfce7; color: #166534; }
.status.realizada { background: #cffafe; color: #155e75; }
.status.cancelada { background: #fee2e2; color: #991b1b; }

.card-actions {
    margin-top: 14px;
    display: flex;
    gap: 8px;
}

/* Dashboard admin */
.dashboard-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin-bottom: 28px;
}

.stat-card {
    background: var(--card);
    padding: 24px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 800;
    color: var(--primary);
}

.stat-label {
    color: var(--text-muted);
    font-size: 14px;
}

/* Tabela */
.admin-section {
    background: var(--card);
    padding: 24px;
    border-radius: 16px;
    box-shadow: var(--shadow);
}

.admin-section h3 {
    margin-bottom: 16px;
    color: var(--primary);
}

.table-responsive {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

th, td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    background: var(--bg);
    font-weight: 700;
    color: var(--text-muted);
}

tr:hover {
    background: #f8fafc;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 100;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--card);
    border-radius: 16px;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    padding: 28px;
    position: relative;
}

.close-modal {
    position: absolute;
    top: 16px;
    right: 20px;
    font-size: 28px;
    cursor: pointer;
    color: var(--text-muted);
}

/* Responsivo */
@media (max-width: 768px) {
    .login-card {
        margin: 40px 16px;
        padding: 28px;
    }

    .app-header {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }

    .container {
        padding: 16px;
    }

    .tabs {
        width: 100%;
    }

    .tab-btn {
        flex: 1;
        text-align: center;
        padding: 12px 8px;
    }

    .filters {
        flex-direction: column;
    }

    .filters input,
    .filters select {
        width: 100%;
    }

    .form-actions {
        flex-direction: column;
    }

    .cards-grid {
        grid-template-columns: 1fr;
    }

    .dashboard-cards {
        grid-template-columns: 1fr;
    }

    table {
        font-size: 13px;
    }

    th, td {
        padding: 8px;
    }
}