:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #e0e7ff;
    --secondary: #0ea5e9;
    --success: #10b981;
    --success-light: #d1fae5;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --danger: #ef4444;
    --danger-light: #fee2e2;
    --bg: #f8fafc;
    --card: #ffffff;
    --text: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --radius: 16px;
    --radius-sm: 10px;
    --radius-xs: 6px;
    --transition: all 0.2s ease;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Inter", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

/* Login */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #4f46e5 0%, #0ea5e9 100%);
}

.login-card {
    background: var(--card);
    padding: 2.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
}

.login-card h1 {
    margin-top: 0;
    margin-bottom: 0.25rem;
    font-size: 1.75rem;
}

.login-card p {
    margin-top: 0;
    color: var(--text-secondary);
    margin-bottom: 1.75rem;
}

.login-card form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.login-card label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text);
}

.login-card input {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: var(--transition);
}

.login-card input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

/* Header */
.topbar {
    background: var(--card);
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 50;
}

.topbar h1 {
    margin: 0;
    font-size: 1.35rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: -0.02em;
}

.topbar nav {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.topbar nav a {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-xs);
}

.topbar nav a:hover {
    color: var(--primary);
    background: var(--primary-light);
}

/* Layout */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 1.5rem;
}

.page-title {
    margin: 0 0 1.5rem 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
}

/* KPIs */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.25rem;
    margin-bottom: 1.75rem;
}

.kpi {
    background: var(--card);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    transition: var(--transition);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.kpi::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--kpi-accent, var(--primary));
    opacity: 0.8;
}

.kpi:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.kpi-icon {
    flex-shrink: 0;
    width: 52px;
    height: 52px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--kpi-bg, var(--primary-light));
    color: var(--kpi-accent, var(--primary));
}

.kpi-icon svg {
    width: 26px;
    height: 26px;
}

.kpi-content {
    flex: 1;
    min-width: 0;
}

.kpi-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
    margin-bottom: 0.35rem;
}

.kpi-value {
    font-size: 1.85rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.kpi-trend {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.35rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.kpi-trend.up {
    color: var(--success);
}

.kpi-trend.down {
    color: var(--danger);
}

/* Cards */
.card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 1.75rem;
    border: 1px solid var(--border);
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    font-weight: 700;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text);
    background: linear-gradient(to right, #ffffff, #f8fafc);
}

.card-header-con-filtro {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.card-header-con-filtro .form-group {
    margin: 0;
}

.card-header-con-filtro .form-group.inline {
    display: flex;
    align-items: center;
    flex-direction: row;
    gap: 0.5rem;
}

.card-header-con-filtro .form-group.inline label {
    margin: 0;
    font-weight: 500;
}

.card-body {
    padding: 1.5rem;
}

/* Formularios y filtros */
.form-inline {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: end;
    margin-bottom: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.form-group label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.form-group-check {
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    gap: 0.35rem;
}

.form-group-check .check-label {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text);
    cursor: pointer;
    font-weight: 500;
}

.form-group-check input[type="checkbox"] {
    width: 1.15rem;
    height: 1.15rem;
    accent-color: var(--primary);
    cursor: pointer;
    border-radius: 4px;
}

.form-group-check .hint {
    font-size: 0.8rem;
    color: var(--danger);
    min-height: 1rem;
    font-weight: 500;
}

input[type="text"],
input[type="date"],
select {
    padding: 0.6rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    font-size: 0.95rem;
    color: var(--text);
    background: #fff;
    transition: var(--transition);
    min-width: 150px;
}

input[type="text"]:focus,
input[type="date"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.65rem 1.25rem;
    border: none;
    border-radius: var(--radius-xs);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition);
    gap: 0.35rem;
    box-shadow: var(--shadow-sm);
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background: #f1f5f9;
    color: var(--text);
}

.btn-secondary:hover {
    background: #e2e8f0;
}

/* Tablas */
.table-responsive {
    overflow-x: auto;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 0.9rem;
}

th, td {
    padding: 0.85rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    background: #f8fafc;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background: #f8fafc;
}

.text-right {
    text-align: right;
}

/* Totales por proveedor */
.totales-proveedor {
    margin-top: 1.75rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.total-proveedor {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1rem 1.15rem;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.total-proveedor:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    border-color: var(--primary-light);
}

.total-proveedor-nombre {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.35rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 500;
}

.total-proveedor-importe {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.01em;
}

.total-absoluto {
    margin-top: 1.25rem;
    padding: 1.15rem 1.5rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #fff;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    text-align: right;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
}

.total-absoluto span {
    font-size: 1.5rem;
    font-weight: 700;
}

/* Paginación */
.pagination {
    display: flex;
    gap: 0.4rem;
    justify-content: center;
    margin-top: 1.25rem;
}

.pagination a,
.pagination span {
    padding: 0.5rem 0.85rem;
    border-radius: var(--radius-xs);
    border: 1px solid var(--border);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.pagination a:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.pagination .current {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    box-shadow: var(--shadow-sm);
}

/* Alertas */
.alert {
    padding: 0.85rem 1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    font-size: 0.95rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.alert-error {
    background: var(--danger-light);
    color: #b91c1c;
    border: 1px solid #fecaca;
}

.alert-success {
    background: var(--success-light);
    color: #047857;
    border: 1px solid #a7f3d0;
}

.hint {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 1rem;
}

/* Utilidades */
.text-muted {
    color: var(--text-secondary);
}

.badge-sin-fecha {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.55rem;
    border-radius: 999px;
    background: var(--danger-light);
    color: #b91c1c;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.empty-state {
    text-align: center;
    padding: 2.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.chart-container {
    position: relative;
    height: 340px;
    width: 100%;
}

/* Grid de gráficas */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.75rem;
}

@media (min-width: 1024px) {
    .dashboard-grid {
        grid-template-columns: 1fr 1fr;
    }

    .dashboard-grid .card-full {
        grid-column: 1 / -1;
    }
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .topbar {
        flex-direction: column;
        gap: 0.75rem;
        align-items: flex-start;
    }

    .topbar h1 {
        font-size: 1.1rem;
    }

    .kpi-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .kpi {
        padding: 1.15rem;
    }

    .kpi-value {
        font-size: 1.5rem;
    }

    .form-inline {
        flex-direction: column;
        align-items: stretch;
    }

    .form-group,
    .form-group-check,
    .btn {
        width: 100%;
    }

    input[type="date"],
    select {
        width: 100%;
    }

    .card-header-con-filtro {
        flex-direction: column;
        align-items: flex-start;
    }

    .chart-container {
        height: 280px;
    }
}

@media (max-width: 480px) {
    .kpi {
        flex-direction: column;
        gap: 0.75rem;
    }

    .kpi-icon {
        width: 44px;
        height: 44px;
    }

    .kpi-icon svg {
        width: 22px;
        height: 22px;
    }
}