:root {
    /* Colors */
    --bg-color: #000000;
    --surface-color: #121212;
    --border-color: #333333;
    --text-primary: #FFFFFF;
    --text-secondary: #AAAAAA;

    --primary-color: #3B82F6;
    --primary-hover: #2563EB;

    --success-color: #10B981;
    --warning-color: #F59E0B;
    --danger-color: #EF4444;

    /* Spacing */
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;

    /* Radius */
    --radius: 8px;
}

/* Flash Messages */
.alert {
    padding: 12px 16px;
    margin-bottom: var(--space-md);
    border-radius: var(--radius);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
}
.alert-success { background: rgba(16, 185, 129, 0.2); color: #10B981; border: 1px solid rgba(16, 185, 129, 0.2); }
.alert-error { background: rgba(239, 68, 68, 0.2); color: #EF4444; border: 1px solid rgba(239, 68, 68, 0.2); }
.alert-warning { background: rgba(245, 158, 11, 0.2); color: #F59E0B; border: 1px solid rgba(245, 158, 11, 0.2); }
.alert-info { background: rgba(59, 130, 246, 0.2); color: #60A5FA; border: 1px solid rgba(59, 130, 246, 0.2); }

.alert .close-btn {
    cursor: pointer;
    font-weight: bold;
    padding: 0 5px;
    opacity: 0.7;
}
.alert .close-btn:hover { opacity: 1; }

* {
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    display: flex;
    min-height: 100vh;
}

/* Sidebar / Navigation */
.sidebar {
    width: 250px;
    background-color: #000000;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: var(--space-md);
    position: fixed;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 1000;
}

.brand {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: var(--space-md);
}

.nav-link {
    display: block;
    padding: 12px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius);
    margin-bottom: 4px;
    transition: all 0.2s;
}

.nav-link:hover,
.nav-link.active {
    background-color: #222;
    color: var(--text-primary);
}

.main-content {
    margin-left: 250px;
    padding: var(--space-lg);
    flex: 1;
    width: calc(100% - 250px);
}

/* Typography */
h1,
h2,
h3 {
    margin-top: 0;
}

h1 {
    font-size: 1.8rem;
    margin-bottom: var(--space-lg);
}

h2 {
    font-size: 1.4rem;
    color: var(--text-secondary);
}

/* Components */
.card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: var(--space-md);
    margin-bottom: var(--space-md);
}

.btn {
    display: inline-block;
    padding: 10px 16px;
    border-radius: var(--radius);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: background 0.2s;
    font-size: 0.95rem;
}

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

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

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

.btn-danger:hover {
    opacity: 0.9;
}

.btn-secondary {
    background-color: #333;
    color: white;
}

.btn-secondary:hover {
    background-color: #444;
}

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

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

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

th {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
}

tr:hover {
    background-color: rgba(255, 255, 255, 0.03);
}

/* Forms */
input,
select,
textarea {
    width: 100%;
    padding: 10px;
    background-color: #000;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: white;
    margin-bottom: var(--space-md);
    font-size: 1rem;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Stepper (Transferencias) */
.stepper {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
}

.step {
    flex: 1;
    text-align: center;
    position: relative;
    padding-bottom: 10px;
}

.step::after {
    /* Line */
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    /* Thicker for visibility */
    background: #333;
    transition: background 0.3s;
}

/* Stepper Line Color */
.step.active::after,
.step.completed::after {
    background-color: var(--step-color) !important;
}

/* Stepper Title Color */
.step.active .step-title,
.step.completed .step-title {
    color: var(--step-color) !important;
    font-weight: bold;
}

/* Utilities */
.text-center {
    text-align: center;
}

.mb-4 {
    margin-bottom: 16px;
}

.flex {
    display: flex;
    gap: 10px;
}

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.badge {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: bold;
}

.badge-success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success-color);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.2);
    color: var(--warning-color);
}

.badge-red {
    background: rgba(239, 68, 68, 0.2);
    color: #EF4444;
}

.badge-pink {
    background: rgba(236, 72, 153, 0.2);
    color: #EC4899;
}

.badge-yellow {
    background: rgba(245, 158, 11, 0.2);
    color: #F59E0B;
}

.badge-navy {
    background: rgba(30, 58, 138, 0.4);
    color: #93C5FD;
}

.badge-lightblue {
    background: rgba(147, 197, 253, 0.2);
    color: #60A5FA;
}

.badge-green {
    background: rgba(16, 185, 129, 0.2);
    color: #10B981;
}

/* Mobile */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        flex-direction: row;
        overflow-x: auto;
        padding: 10px;
        white-space: nowrap;
    }

    .main-content {
        margin-left: 0;
        width: 100%;
        padding: 15px;
    }

    body {
        flex-direction: column;
    }

    .nav-link {
        display: inline-block;
        margin-right: 10px;
    }

    .brand {
        display: none;
    }

    /* Show in header instead */
}