:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --secondary: #64748b;
    --secondary-hover: #475569;
    --bg-color: #f1f5f9;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    
    --sidebar-w: 260px;
    --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --radius: 8px;
}

:root.dark-theme {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    
    --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.5);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.5), 0 2px 4px -1px rgba(0,0,0,0.3);
}

:root.dark-theme .data-table tbody tr:hover {
    background: #334155;
}
:root.dark-theme .btn-secondary:hover {
    background: #334155;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
}

/* Screens */
.screen {
    display: none;
    min-height: 100vh;
}
.screen.active {
    display: flex;
}

/* Auth */
.auth-container {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, #818cf8 100%);
}
.auth-box {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
    text-align: center;
}
.auth-box h2 {
    color: var(--primary);
    margin-bottom: 0.5rem;
    font-size: 2rem;
}
.auth-box p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}
.form-group {
    margin-bottom: 1.25rem;
    text-align: left;
    display: flex;
    flex-direction: column;
}
.form-group label {
    font-weight: 500;
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}
.form-group input, .form-group select {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    outline: none;
    transition: border 0.2s;
    font-size: 1rem;
}
.form-group input:focus, .form-group select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 1rem;
    width: 100%;
    margin-bottom: 0.75rem;
}
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary { background: var(--bg-color); color: var(--text-main); border: 1px solid var(--border-color); }
.btn-secondary:hover { background: #e2e8f0; }
.w-full { width: 100%; }

/* Main App Layout */
.sidebar {
    width: var(--sidebar-w);
    background: var(--card-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 10;
}
.sidebar-header {
    padding: 2rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}
.sidebar-header h2 {
    color: var(--primary);
    font-weight: 700;
}
.sidebar-nav {
    flex: 1;
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.nav-item {
    padding: 0.875rem 1rem;
    text-decoration: none;
    color: var(--text-muted);
    border-radius: var(--radius);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.2s;
}
.nav-item:hover, .nav-item.active {
    background: var(--primary);
    color: white;
}
.sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
}
.btn-logout {
    background: none;
    border: none;
    color: var(--text-muted);
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.5rem;
    border-radius: var(--radius);
}
.btn-logout:hover {
    background: var(--bg-color);
    color: var(--danger);
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-w);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
.top-header {
    background: var(--card-bg);
    padding: 1.5rem 2.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 5;
}
.month-filter {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.month-filter input {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-weight: 500;
}

.content-wrapper {
    padding: 2.5rem;
    flex: 1;
}

.tab-pane {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}
.tab-pane.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

/* Dashboard */
.dashboard-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
}
.stat-card {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}
.stat-card.summary {
    padding: 1rem 1.5rem;
}
.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}
.stat-icon.income { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.stat-icon.expense { background: rgba(239, 68, 68, 0.1); color: var(--danger); }
.stat-icon.balance { background: rgba(79, 70, 229, 0.1); color: var(--primary); }

.stat-info h3 {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 0.25rem;
}
.stat-info p {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
}

.charts-container {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 1.5rem;
}
.chart-card h3 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    color: var(--text-main);
}

/* Forms */
.form-row {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}
.form-row .form-group {
    flex: 1;
    min-width: 200px;
}
.form-row .flex-2 { flex: 2; }
.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 1rem;
}
.form-actions .btn {
    width: auto;
    margin-bottom: 0;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
}
.data-table {
    width: 100%;
    border-collapse: collapse;
}
.data-table th, .data-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
.data-table th {
    background: var(--bg-color);
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.data-table tbody tr:hover {
    background: #f8fafc;
}

/* Colors & Badges */
.text-success { color: var(--success); font-weight: 600; }
.text-danger { color: var(--danger); font-weight: 600; }

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    display: inline-block;
}
.badge-pago { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.badge-pendente { background: rgba(245, 158, 11, 0.1); color: var(--warning); }
.badge-entrada { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.badge-saida { background: rgba(239, 68, 68, 0.1); color: var(--danger); }

/* Category List */
.category-list {
    list-style: none;
}
.category-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}
.cat-color-dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    display: inline-block;
    margin-right: 0.75rem;
    vertical-align: middle;
}
.action-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    padding: 0.5rem;
    transition: color 0.2s;
}
.action-btn.edit:hover { color: var(--info); }
.action-btn.delete:hover { color: var(--danger); }

/* Alerts */
.alerts-container {
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.alert-box {
    padding: 1rem;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    gap: 1rem;
    font-weight: 500;
}
.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.2);
}
.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Toasts */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.toast {
    background: var(--card-bg);
    color: var(--text-main);
    padding: 1rem 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 300px;
    transform: translateX(120%);
    animation: slideIn 0.3s forwards;
    border-left: 4px solid var(--primary);
}
.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }

@keyframes slideIn {
    to { transform: translateX(0); }
}
@keyframes slideOut {
    to { transform: translateX(120%); opacity: 0; }
}

@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); }
    .main-content { margin-left: 0; }
    .charts-container { grid-template-columns: 1fr; }
}