/* ============================================
   CONTROL DE PAGOS A PROVEEDORES
   Estilos CSS - Diseño Minimalista
   ============================================ */

/* ============================================
   VARIABLES CSS
   ============================================ */
:root {
    /* Colores Principales */
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-secondary: #64748b;
    --color-danger: #dc2626;
    --color-success: #16a34a;

    /* Colores de Fondo */
    --bg-body: #f8fafc;
    --bg-card: #ffffff;
    --bg-header: #1e293b;

    /* Colores de Texto */
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-light: #cbd5e1;
    --text-white: #ffffff;

    /* Bordes */
    --border-color: #e2e8f0;
    --border-radius: 8px;

    /* Espaciado */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Sombras */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

/* ============================================
   RESET Y BASE
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
}

/* ============================================
   UTILIDADES
   ============================================ */
.hidden {
    display: none !important;
}

.view {
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ============================================
   PANTALLA DE CARGA
   ============================================ */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-body);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-screen p {
    margin-top: var(--spacing-sm);
    color: var(--text-secondary);
}

/* ============================================
   HEADER
   ============================================ */
.header {
    background-color: var(--bg-header);
    color: var(--text-white);
    padding: var(--spacing-md) 0;
    box-shadow: var(--shadow-md);
}

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

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

.subtitle {
    color: var(--text-light);
    margin-top: var(--spacing-xs);
}

/* ============================================
   CARDS
   ============================================ */
.card {
    background-color: var(--bg-card);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.login-card {
    max-width: 400px;
    margin: var(--spacing-xl) auto;
}

.login-card h1 {
    text-align: center;
    margin-bottom: var(--spacing-xs);
    font-size: 2rem;
}

.login-card .subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* ============================================
   FORMULARIOS
   ============================================ */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s, box-shadow 0.2s;
}

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

.form-inline {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.form-group-full {
    grid-column: 1 / -1;
}

/* ============================================
   BOTONES
   ============================================ */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
    font-family: inherit;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--text-white);
    grid-column: 1 / -1;
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--text-white);
    border: 1px solid var(--text-white);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.btn-danger {
    background-color: var(--color-danger);
    color: var(--text-white);
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-danger:hover {
    background-color: #b91c1c;
}

.btn-link {
    background: none;
    color: var(--color-primary);
    padding: 0.5rem;
    text-decoration: underline;
}

/* ============================================
   MENSAJES DE ERROR
   ============================================ */
.error-message {
    background-color: #fee2e2;
    color: var(--color-danger);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    margin-top: var(--spacing-sm);
    border-left: 4px solid var(--color-danger);
}

/* ============================================
   TABS / PESTAÑAS
   ============================================ */
.tabs {
    display: flex;
    gap: var(--spacing-xs);
    margin: var(--spacing-lg) 0;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.2s, border-color 0.2s;
    margin-bottom: -2px;
    font-family: inherit;
}

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

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

.tab-content {
    display: none;
}

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

/* ============================================
   SECCIONES
   ============================================ */
.section {
    margin-bottom: var(--spacing-xl);
}

.section h2 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

/* ============================================
   PROVEEDORES GRID
   ============================================ */
.providers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.provider-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    transition: box-shadow 0.2s;
}

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

.provider-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
}

.provider-card .contact {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.provider-card .balance {
    font-size: 1.5rem;
    font-weight: 600;
    margin: var(--spacing-sm) 0;
}

.provider-card .balance.positive {
    color: var(--color-success);
}

.provider-card .balance.negative {
    color: var(--color-danger);
}

.provider-card .actions {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
}

.provider-card .public-link {
    font-size: 0.75rem;
    color: var(--text-secondary);
    word-break: break-all;
    margin-top: var(--spacing-sm);
    padding: var(--spacing-xs);
    background-color: var(--bg-body);
    border-radius: 4px;
}

/* ============================================
   TABLA DE TRANSACCIONES
   ============================================ */
.transactions-table {
    width: 100%;
    background-color: var(--bg-card);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

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

.transactions-table th {
    background-color: var(--bg-header);
    color: var(--text-white);
    padding: var(--spacing-sm);
    text-align: left;
    font-weight: 500;
}

.transactions-table td {
    padding: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

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

.transactions-table tr:hover {
    background-color: var(--bg-body);
}

.transaction-type {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 500;
}

.transaction-type.purchase {
    background-color: #fee2e2;
    color: var(--color-danger);
}

.transaction-type.payment {
    background-color: #dcfce7;
    color: var(--color-success);
}

.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
}

/* ============================================
   RESUMEN DE TOTALES (Vista Proveedor)
   ============================================ */
.summary-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.summary-card {
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    text-align: center;
}

.summary-card__label {
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.85;
    margin-bottom: var(--spacing-xs);
}

.summary-card__amount {
    font-size: 1.75rem;
    font-weight: 700;
}

.summary-card--debt {
    background-color: #fee2e2;
    color: var(--color-danger);
}

.summary-card--paid {
    background-color: #dcfce7;
    color: var(--color-success);
}

/* ============================================
   BALANCE CARD (Vista Proveedor)
   ============================================ */
.balance-card {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--text-white);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.balance-card h2 {
    font-size: 1rem;
    font-weight: 400;
    margin-bottom: var(--spacing-sm);
    opacity: 0.9;
}

.balance-amount {
    font-size: 3rem;
    font-weight: 700;
    margin: var(--spacing-md) 0;
}

.balance-status {
    font-size: 1rem;
    opacity: 0.9;
}

/* Colores de balance para vista proveedor */
.balance-card.negative {
    background: linear-gradient(135deg, var(--color-success) 0%, #15803d 100%);
}

.balance-card.positive {
    background: linear-gradient(135deg, var(--color-danger) 0%, #b91c1c 100%);
}

/* ============================================
   FILTROS
   ============================================ */
.filter-select {
    width: 100%;
    max-width: 300px;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
}

/* ============================================
   RESPONSIVE DESIGN - MOBILE FIRST
   ============================================ */

/* Tablets */
@media (max-width: 768px) {
    .header h1 {
        font-size: 1.25rem;
    }

    .form-inline {
        grid-template-columns: 1fr;
    }

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

    .transactions-table {
        font-size: 0.875rem;
    }

    .transactions-table th,
    .transactions-table td {
        padding: var(--spacing-xs);
    }

    .balance-amount {
        font-size: 2rem;
    }
}

/* Mobile */
@media (max-width: 480px) {
    :root {
        --spacing-md: 1rem;
        --spacing-lg: 1.5rem;
    }

    .header-content {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .btn-secondary {
        width: 100%;
    }

    .tabs {
        flex-direction: column;
        border-bottom: none;
    }

    .tab-btn {
        border-bottom: 1px solid var(--border-color);
        text-align: left;
    }

    .provider-card .actions {
        flex-direction: column;
    }

    /* Hacer tabla scrolleable horizontalmente en móviles */
    .transactions-table {
        overflow-x: auto;
        display: block;
    }

    .transactions-table table {
        min-width: 600px;
    }
}