:root {
    /* Paleta de Cores: Azul e Branco, Textos Preto e Cinza Chumbo */
    --primary-color: #0056b3; /* Azul moderno */
    --primary-hover: #004494;
    --primary-light: #e6f0fa;
    --white: #ffffff;
    --bg-color: #f4f7f6;
    
    --text-main: #1a1a1a; /* Preto suave */
    --text-muted: #4a4a4a; /* Cinza chumbo */
    
    --success: #28a745;
    --danger: #dc3545;
    --border-color: #e1e5eb;
    
    --sidebar-width: 260px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-size: 15px;
    line-height: 1.6;
}

/* =========================================
   LOGIN
   ========================================= */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: var(--primary-color);
    background-image: linear-gradient(135deg, #0056b3 0%, #003d82 100%);
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 20px;
}

.login-box {
    background: var(--white);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.2);
}

.login-logo h1 {
    color: var(--primary-color);
    font-size: 28px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 5px;
    letter-spacing: -0.5px;
}

.login-subtitle {
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 30px;
    font-size: 14px;
}

/* =========================================
   FORMULÁRIOS E BOTÕES
   ========================================= */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-muted);
    font-size: 14px;
}

.form-group input, .form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    color: var(--text-main);
    transition: all 0.3s ease;
    background-color: #fafbfc;
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: var(--white);
    box-shadow: 0 0 0 3px rgba(0, 86, 179, 0.1);
}

.btn {
    display: inline-block;
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 86, 179, 0.2);
}

.btn-block {
    width: 100%;
}

.alert {
    padding: 12px 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    font-weight: 500;
}

.alert.error {
    background-color: #fdf3f4;
    color: var(--danger);
    border: 1px solid #f8d7da;
}

/* =========================================
   LAYOUT PRINCIPAL
   ========================================= */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--white);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
    transition: transform 0.3s ease;
    box-shadow: 2px 0 10px rgba(0,0,0,0.02);
}

.sidebar-header {
    padding: 25px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h2 {
    color: var(--primary-color);
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.sidebar-nav {
    padding: 20px 0;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.nav-link {
    display: block;
    padding: 14px 24px;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.nav-link:hover, .nav-link.active {
    background-color: var(--primary-light);
    color: var(--primary-color);
    border-left: 3px solid var(--primary-color);
}

.nav-link.logout {
    margin-top: auto;
    color: var(--danger);
}

.nav-link.logout:hover {
    background-color: #fdf3f4;
    border-left-color: var(--danger);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.top-header {
    background-color: var(--white);
    padding: 15px 30px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    align-items: center;
    height: 70px;
}

.user-info {
    font-weight: 500;
    color: var(--text-muted);
    font-size: 14px;
}

.content-wrapper {
    padding: 30px;
    flex: 1;
}

.mobile-only {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-muted);
}

/* =========================================
   DASHBOARD
   ========================================= */
.dashboard-header {
    margin-bottom: 30px;
}

.dashboard-header h2 {
    font-size: 26px;
    color: var(--text-main);
    font-weight: 700;
    letter-spacing: -0.5px;
}

.dashboard-header p {
    color: var(--text-muted);
    font-size: 15px;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 30px;
}

.card {
    background: var(--white);
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.03);
    border: 1px solid var(--border-color);
}

.summary-card h3 {
    font-size: 13px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
    font-weight: 600;
}

.summary-card .amount {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-main);
    letter-spacing: -1px;
}

.summary-card.income .amount { color: var(--success); }
.summary-card.expense .amount { color: var(--danger); }
.summary-card.balance.positive .amount { color: var(--primary-color); }
.summary-card.balance.negative .amount { color: var(--danger); }

.dashboard-content {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 24px;
    align-items: start;
}

.card h3 {
    margin-bottom: 20px;
    font-size: 18px;
    color: var(--text-main);
    font-weight: 600;
}

/* =========================================
   TABELAS
   ========================================= */
.table-responsive {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th, .data-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background-color: #fafbfc;
}

.data-table td {
    font-size: 14px;
    color: var(--text-main);
}

.data-table tbody tr:hover {
    background-color: #fafbfc;
}

.text-success { color: var(--success); font-weight: 500; }
.text-danger { color: var(--danger); font-weight: 500; }
.text-center { text-align: center; }
.font-weight-bold { font-weight: 600; }

/* =========================================
   RESPONSIVIDADE
   ========================================= */
@media (max-width: 992px) {
    .dashboard-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.active {
        transform: translateX(0);
    }
    .main-content {
        margin-left: 0;
    }
    .mobile-only {
        display: block;
    }
    .top-header {
        justify-content: space-between;
    }
    .cards-grid {
        grid-template-columns: 1fr;
    }
}