/*RESET Y VARIABLES CSS*/
:root {
    /* Colores principales */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --danger-gradient: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    --calculate-gradient: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);

    /* Colores de superficie */
    --surface-primary: #ffffff;
    --surface-secondary: #f8fafc;
    --surface-elevated: #ffffff;
    --surface-overlay: rgba(15, 23, 42, 0.8);

    /* Colores de texto */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-inverse: #ffffff;

    /* Colores de borde y división */
    --border-light: #e2e8f0;
    --border-medium: #cbd5e1;
    --divider: #f1f5f9;

    /* 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), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-fab: 0 8px 25px rgba(102, 126, 234, 0.3);

    /* Espaciado */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Fuentes */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Transiciones */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
    scroll-behavior: smooth;
    height: 100%;
}

body {
    font-family: var(--font-sans);
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding: var(--space-sm);
    overflow-x: hidden;
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    user-select: none;
}

/*CONTENEDOR PRINCIPAL*/
.container {
    width: 100%;
    max-width: 420px;
    background: var(--surface-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    margin: var(--space-sm) 0 0 0;
    border: 1px solid var(--border-light);
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - 1rem);
}

/*HEADER MODERNO*/
.header {
    background: var(--primary-gradient);
    padding: var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
}

.header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 200px;
    height: 200px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    z-index: 1;
}

.header-left,
.header-right {
    z-index: 2;
    position: relative;
}

.logo img {
    height: 65px;
    width: auto;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.app-name {
    font-size: 1.375rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-inverse);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    z-index: 2;
    position: relative;
}

.menu-icon {
    font-size: 1.25rem;
    color: var(--text-inverse);
    cursor: pointer;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
    z-index: 2;
    position: relative;
}

.menu-icon:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* ===============================================
   SISTEMA DE PESTAÑAS (TABS)
   =============================================== */
.tab-container {
    display: flex;
    background-color: var(--surface-secondary);
    padding: var(--space-xs);
    margin: var(--space-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.tab-btn {
    flex: 1;
    padding: var(--space-md);
    border: none;
    background-color: transparent;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-sm);
}

.tab-btn.active {
    background-color: var(--surface-primary);
    color: var(--text-primary);
    box-shadow: var(--shadow-md);
}

.tab-btn:not(.active):hover {
    background-color: var(--border-light);
}

.tab-content {
    /* flex: 1; */
    overflow-y: auto;
    padding: 0 var(--space-md);
    padding-bottom: 160px;
}

.tab-panel {
    display: none;
}

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

/* Ocultar las secciones originales que ahora son paneles */
.participants-section,
.expenses-section {
    box-shadow: none;
    border: none;
    margin: 0;
}

/* Ajustes para que el contenido principal ocupe el espacio */
.container {
    display: flex;
    flex-direction: column;
}

main.tab-content {
    padding: 0 var(--space-md);
}

/*ÁREA DE CONTENIDO*/
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

/*SECCIONES MODERNAS*/
.section {
    background: var(--surface-primary);
    margin: var(--space-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
    overflow: hidden;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.section:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg);
    background: var(--surface-secondary);
    border-bottom: 1px solid var(--divider);
}

.section-header h2 {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.section-header h2::before {
    content: '👥';
    font-size: 1rem;
}

.expenses-section .section-header h2::before {
    content: '💰';
}

/*BOTONES*/
.add-form {
    background: var(--success-gradient);
    color: var(--text-inverse);
    border: none;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-fast);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transform: translateX(-20px);
    opacity: 0;
}

.hamburger-menu.active .menu-item {
    transform: translateX(0);
    opacity: 1;
}

.hamburger-menu.active .menu-item:nth-child(1) {
    transition-delay: 0.1s;
}

.hamburger-menu.active .menu-item:nth-child(2) {
    transition-delay: 0.15s;
}

.menu-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateX(5px);
    padding-left: calc(var(--space-xl) + 5px);
}

.menu-item i {
    margin-right: var(--space-lg);
    font-size: 1.125rem;
    width: 20px;
    transition: transform var(--transition-fast);
}

.menu-item:hover i {
    transform: scale(1.1);
}

.menu-item span {
    font-size: 1rem;
    font-weight: var(--font-weight-medium);
}

.menu-footer {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    transform: translateY(10px);
    opacity: 0;
    transition: all var(--transition-normal) 0.2s;
}

.hamburger-menu.active .menu-footer {
    transform: translateY(0);
    opacity: 1;
}

.menu-footer p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.8125rem;
}

/* Overlay para el menú hamburguesa */
#hamburgerOverlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    z-index: 998;
    opacity: 0;
    transition: opacity var(--transition-normal);
    backdrop-filter: blur(2px);
}

/*FOOTER*/
.footer {
    text-align: center;
    padding: var(--space-lg);
    color: var(--text-inverse);
    font-size: 0.8rem;
    flex-shrink: 0;
    background: var(--primary-gradient);
    position: relative;
    overflow: hidden;
}

/* Forma redondeada decorativa para el footer */
.footer::before {
    content: '';
    position: absolute;
    bottom: -50%;
    left: -20%;
    width: 200px;
    height: 200px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

.footer p {
    font-size: 0.8125rem;
}

/*ANIMACIONES Y EFECTOS*/
.swipe-hint {
    transform: translateX(-10px);
    background-color: rgba(248, 113, 113, 0.1) !important;
}

.removing {
    transform: translateX(-100%);
    opacity: 0;
    transition: all var(--transition-normal);
}

/*ESTADOS DE HOVER GLOBALES*/
@media (hover: hover) {

    .participant:hover,
    .expense-item:hover {
        transform: translateX(4px);
    }
}

/* ===============================================
   FIX PARA BOTONES DE ACCIÓN EN MODAL
   =============================================== */

.modal-button-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    /* Dos columnas de igual tamaño */
    gap: var(--space-md);
    /* Espacio entre los botones */
    margin-top: var(--space-lg);
}

.modal-action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 48px;
    padding: var(--space-sm) var(--space-md);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 0.9375rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-inverse);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.modal-action-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Espacio entre el ícono y el texto */
.modal-action-btn i {
    margin-right: var(--space-sm);
}

/*RESPONSIVE DESIGN*/

/* Desktop Styles */
@media (min-width: 768px) {
    .container {
        max-width: 520px;
        margin: 0 auto;
    }
    
    .section {
        margin: var(--space-xl) var(--space-lg);
    }

    .fab-container {
        /* Ajusto la posición para que se alinee con el contenedor */
        right: calc(50% - 260px - var(--space-lg));
        bottom: var(--space-2xl);
    }
}

@media (min-width: 1024px) {
    .container {
        max-width: 580px;
    }

    .modal-content {
        width: 500px;
        max-width: 580px;
    }

    .section {
        margin: var(--space-2xl) var(--space-xl);
    }

    .fab-container {
        right: calc(50% - 290px - var(--space-lg));
    }
}

@media (max-width: 900px) {
    :root {
        --space-sm: 0.375rem;
        --space-md: 0.75rem;
        --space-lg: 1rem;
        --space-xl: 1.25rem;
        --space-2xl: 2rem;
    }

    .container {
        margin: 0;
        border-radius: 0;
        min-height: 100vh;
    }

    .header {
        padding: var(--space-lg);
        border-radius: 0;
    }

    .section {
        margin: var(--space-md);
        border-radius: var(--radius-lg);
    }

    .modal {
        padding: var(--space-sm);
        padding-top: 5vh;
    }

    .modal-content {
        max-width: 90vh;
        max-width: 400px;
        border-radius: var(--radius-xl) var(--radius-xl) 0 0;
        margin-top: 0;
    }

    .modal-button-container {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
    }

    .fab-container {
        bottom: var(--space-lg);
        right: var(--space-md);
    }

    .hamburger-menu {
        width: 100%;
        right: -100%;
    }

    .hamburger-menu.active {
        right: 0;
    }

    .app-name {
        font-size: 1.25rem;
    }

    .expense-info {
        font-size: 0.875rem;
    }

    .expense-description {
        font-size: 0.9375rem;
    }

    .transfer-item {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        row-gap: 0;
        padding-bottom: var(--space-sm);
    }

    .transfer-description {
        display: flex;
        align-items: center;
        flex-grow: 1;
        flex-shrink: 1;
        min-width: 0;
        overflow: hidden;
    }

    .transfer-amount {
        flex-basis: 100%;
        text-align: right;
        padding-top: var(--space-xs);
        font-size: 1.2rem;
        font-weight: var(--font-weight-bold);
    }

}

/* ===============================================
   PARA TEXTO EN MODO CLARO
   =============================================== */
@media (prefers-color-scheme: light) {
    .results-total h3 {
        color: var(--text-primary) !important;
    }
}

    /* SUPPORT DARK MODE*/
@media (prefers-color-scheme: dark) {
    :root {
        --surface-primary: #1e293b;
        --surface-secondary: #334155;
        --surface-elevated: #475569;
        --surface-overlay: rgba(0, 0, 0, 0.8);

        --text-primary: #f8fafc;
        --text-secondary: #cbd5e1;
        --text-muted: #94a3b8;

        --border-light: #475569;
        --border-medium: #64748b;
        --divider: #334155;
    }

    body {
        background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    }

    .header::before {
        background: rgba(255, 255, 255, 0.05);
    }
}

/*UTILIDADES*/
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/*FOCUS STATES*/
*:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

button:focus,
input:focus,
select:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.3);
}

/*LOADING STATES*/
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

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

/*TOAST NOTIFICATIONS*/
#toast {
    position: fixed;
    bottom: 120px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    color: var(--text-inverse);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    z-index: 1002;
    opacity: 0;
    transition: opacity var(--transition-normal);
    pointer-events: none;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-lg);
}

/*SHORTCUTS FEEDBACK*/
#shortcut-feedback {
    position: fixed;
    top: var(--space-xl);
    right: var(--space-xl);
    background: var(--primary-gradient);
    color: var(--text-inverse);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    z-index: 1003;
    opacity: 0;
    transform: translateX(100px);
    transition: all var(--transition-normal);
    pointer-events: none;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-xl);
}

/*HELP MODAL*/
.modal-help-type .shortcuts-grid {
    display: grid;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.shortcut-item {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-md);
    background: var(--surface-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
}

.shortcut-item kbd {
    background: var(--primary-gradient);
    color: var(--text-inverse);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: var(--font-weight-bold);
    min-width: 32px;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.help-footer {
    background: var(--surface-secondary);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
}

.help-footer p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin: 0;
}

/*ABOUT & CONTACT MODALS*/
.about-content,
.contact-content {
    line-height: 1.6;
}

.about-content h3,
.contact-content h3 {
    color: var(--text-primary);
    margin: var(--space-xl) 0 var(--space-md) 0;
    font-size: 1.0625rem;
    font-weight: var(--font-weight-semibold);
}

.about-content h3:first-child,
.contact-content h3:first-child {
    margin-top: 0;
}

.about-content ul {
    list-style: none;
    padding: 0;
    margin: var(--space-md) 0;
}

.about-content ul li {
    padding: var(--space-sm) 0;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--divider);
}

.about-content ul li:last-child {
    border-bottom: none;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-lg);
    padding: var(--space-lg);
    background: var(--surface-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    transition: all var(--transition-fast);
}

.contact-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.contact-item i {
    font-size: 1.5rem;
    color: #667eea;
    margin-top: var(--space-xs);
}

.contact-item div h4 {
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
}

.contact-item div p {
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
    font-size: 0.875rem;
}

.contact-item div a {
    color: #667eea;
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
}

.contact-item div a:hover {
    color: #764ba2;
    text-decoration: underline;
}

/*SCROLLBAR CUSTOMIZATION*/
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--surface-secondary);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb {
    background: var(--border-medium);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/*PRINT STYLES*/
@media print {
    body {
        background: white;
        color: black;
    }

    .fab-container,
    .header,
    .modal,
    .backdrop {
        display: none !important;
    }

    .section {
        box-shadow: none;
        border: 1px solid #ccc;
        break-inside: avoid;
    }
}



/*REGLA RESTAURADA*/
.add-form {
    box-shadow: var(--shadow-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    min-height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.add-form:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.add-form:active {
    transform: translateY(0);
}

/* ===============================================
   CONTENIDO DE LISTAS (CON HOVER UNIFICADO)
   =============================================== */

.list-content {
    padding: 0;
}

.participant,
.expense-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--divider);
    transition: background-color var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.participant:last-child,
.expense-item:last-child {
    border-bottom: none;
}

/*CóDIGO CORREGIDO PARA EL HOVER */

/* 1. Define la barra lateral para AMBOS y la mantiene oculta */
.participant::before,
.expense-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    transform: scaleY(0);
    transition: transform var(--transition-fast);
    transform-origin: center;
}

/* 2. Define el color de cada barra */
.participant::before {
    background: var(--primary-gradient);
}
.expense-item::before {
    background: var(--secondary-gradient);
}

/* 3. Al pasar el mouse sobre CUALQUIERA de los dos, la barra aparece */
.participant:hover::before,
.expense-item:hover::before {
    transform: scaleY(1);
}

/* 4. Cambia el fondo de toda la fila al pasar el mouse */
.participant:hover,
.expense-item:hover {
    background-color: var(--surface-secondary);
}


.participant span,
.expense-item .expense-info {
    font-size: 0.9375rem;
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
}

/*INFORMACIÓN DE GASTOS*/
.expense-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.expense-description {
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    font-size: 1rem;
}

.expense-payer {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.expense-payer::before {
    content: '👤';
    font-size: 0.75rem;
}

.expense-excluded {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.expense-excluded::before {
    content: '🚫';
    font-size: 0.625rem;
}

.expense-amount {
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    font-size: 1.0625rem;
    background: var(--success-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
/*BOTONES DE ELIMINACIÓN*/
.remove-btn,
.delete-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.25rem;
    cursor: pointer;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
}

.remove-btn:hover,
.delete-btn:hover {
    background-color: rgba(248, 113, 113, 0.1);
    color: #ef4444;
    transform: scale(1.1);
}

/*ESTADOS VACÍOS*/
.empty-state {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--text-muted);
    display: none;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.empty-state.show {
    display: flex;
}

.empty-icon {
    font-size: 3rem;
    opacity: 0.5;
    margin-bottom: var(--space-sm);
}

.empty-state p {
    font-size: 0.9375rem;
    line-height: 1.5;
    max-width: 250px;
}

/*SECCIÓN DE CÁLCULO*/
.calculate-section {
    padding: var(--space-lg);
    display: flex;
    justify-content: center;
    margin-top: auto;
    flex-shrink: 0;
}

.calculate-btn {
    background: var(--calculate-gradient);
    color: var(--text-inverse);
    padding: var(--space-lg) var(--space-2xl);
    border: none;
    border-radius: var(--radius-full);
    font-size: 1.0625rem;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
    min-width: 200px;
}

.calculate-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

.calculate-btn:hover::before {
    left: 100%;
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.calculate-btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    transform: none;
    box-shadow: var(--shadow-sm);
}

.calculate-btn:disabled::before {
    display: none;
}

/* ===============================================
   SISTEMA FAB
   =============================================== */

.fab-container {
    position: absolute;
    bottom: 85px;
    right: var(--space-lg);
    z-index: 100;
}

.fab {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-fab);
    transition: all var(--transition-normal);
    font-size: 1.5rem;
    color: var(--text-inverse);
    background: var(--primary-gradient);
}

.fab:hover {
    transform: scale(1.1) rotate(90deg);
    box-shadow: var(--shadow-lg);
}

/*MODALES*/
.backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--surface-overlay);
    z-index: 1010;
    opacity: 0;
    /* Empieza transparente */
    transition: opacity var(--transition-normal);
    /* Animación de fundido */
    pointer-events: none;
    backdrop-filter: blur(4px);
}

.backdrop.active {
    opacity: 1;
    /* Se vuelve opaco */
    pointer-events: auto;
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1020;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);

    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
    pointer-events: none;
}

.modal.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

/* Modal específico para formularios (participantes y gastos) */
.modal-form-type {
    align-items: flex-start;
    padding-top: 5vh;
}

.modal-form-type .backdrop {
    align-items: flex-start;
    padding-top: 5vh;
}

/* Modal específico para resultados */
.modal-results-type {
    align-items: flex-start;
    padding-top: 5vh;
}

.modal-results-type .backdrop {
    align-items: flex-start;
    padding-top: 5vh;
}

.modal-content {
    background: var(--surface-elevated);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);

    width: 100%;
    max-width: 90vh;

    transform: scale(0.95);
    transition: transform var(--transition-normal);
    display: flex;
    flex-direction: column;
    max-height: 85vh;
    overflow: hidden;
}

.modal.active .modal-content {
    transform: scale(1);
    /* Vuelve a su tamaño normal con una animación */
}

.modal-header {
    padding: var(--space-xl);
    background: var(--surface-secondary);
    border-bottom: 1px solid var(--divider);
    position: relative;
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin: 0;
}

.close-btn {
    position: absolute;
    top: var(--space-lg);
    right: var(--space-lg);
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    background: none;
    border: none;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    background-color: rgba(248, 113, 113, 0.1);
    color: #ef4444;
    transform: scale(1.1);
}

.modal-body {
    padding: var(--space-xl);
    max-height: 60vh;
    overflow-y: auto;
}

/*FORMULARIOS*/
.modal-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.modal-form input,
.modal-form select {
    width: 100%;
    padding: var(--space-lg);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-family: var(--font-sans);
    transition: all var(--transition-fast);
    background: var(--surface-primary);
    color: var(--text-primary);
}

.modal-form input:focus,
.modal-form select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    background: var(--surface-elevated);
    color: var(--text-primary);
}

.modal-form input::placeholder {
    color: var(--text-secondary);
}

/* Estilos específicos para campos en modo oscuro */
@media (prefers-color-scheme: dark) {

    .modal-form input,
    .modal-form select {
        color: #f8fafc;
        background: #334155;
    }

    .modal-form input:focus,
    .modal-form select:focus {
        color: #f8fafc;
        background: #475569;
    }

    .modal-form input::placeholder {
        color: #94a3b8;
    }
}

/* ===============================================
   BOTONES DE ACCIÓN PRINCIPAL EN MODALES
   =============================================== */

/* Estilo para el botón principal (azul/violeta) */
button.primary-btn {
    background: var(--primary-gradient);
    color: var(--text-inverse);
    padding: var(--space-lg);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: var(--shadow-md);
}

/* Efecto al pasar el mouse o tocar */
button.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/*SECCIÓN DE EXCLUIDOS*/
.excluded-participants-section {
    margin-top: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--divider);
}

.excluded-participants-section h3 {
    font-size: 0.9375rem;
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.excluded-participants-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.excluded-participant-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--surface-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.excluded-participant-item:hover {
    background-color: var(--border-light);
}

.excluded-participant-item input[type="checkbox"] {
    width: auto;
    margin: 0;
    cursor: pointer;
}

/*RESULTADOS*/
.results-container {
    max-height: 60vh;
    overflow-y: auto;
    padding: var(--space-lg);
    background: var(--surface-secondary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-lg);
    border: 1px solid var(--border-light);
}

.results-header h2 {
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    text-align: center;
}

.results-section {
    margin-bottom: var(--space-xl);
}

.results-section h3 {
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    font-size: 1.0625rem;
    font-weight: var(--font-weight-semibold);
}

.results-total {
    background: var(--success-gradient);
    color: var(--text-inverse);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    margin: var(--space-lg) 0;
}

.results-total h3 {
    color: var(--text-inverse);
    margin: 0;
}

.expense-summary-item,
.transfer-item {
    padding: var(--space-md);
    background: var(--surface-primary);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-sm);
    border: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.transfer-item {
    align-items: center;
    gap: var(--space-md);
}

.transfer-description {
    flex: 1;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.transfer-from,
.transfer-to {
    white-space: nowrap;
    /* Impide que el nombre se divida en varias líneas */
    overflow: hidden;
    /* Oculta el texto del nombre si es muy largo */
    text-overflow: ellipsis;
    /* Muestra "..." si el nombre es demasiado largo para el espacio */
}

.transfer-arrow {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.transfer-amount {
    font-weight: var(--font-weight-bold);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* === BOTONES DE ACCIÓN === */
.modal-button-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    justify-content: stretch;
}

.modal-action-btn {
    background: linear-gradient(135deg, #16a34a 0%, #15803d 100%);
    color: var(--text-inverse);
    padding: var(--space-lg);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 0.9375rem;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    height: 48px;
    text-align: center;
}

#shareWhatsappBtn {
    background: linear-gradient(135deg, #25d366 0%, #128c7e 100%);
}

/* FIX: Anula cualquier fondo del ícono para que sea transparente */
#shareWhatsappBtn i {
    background: transparent !important;
    background-color: transparent !important;
}

#copyResultsBtn {
    background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
}

.modal-action-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/*MENÚ HAMBURGUESA*/
.hamburger-menu {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(20px);
    width: 280px;
    height: 100vh;
    position: fixed;
    top: 0;
    right: -280px;
    transition: right var(--transition-normal) cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1001;
    border-left: 1px solid var(--border-medium);
    transform: translateZ(0);
}

.hamburger-menu.active {
    right: 0;
}

.menu-header {
    padding: var(--space-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transform: translateY(-10px);
    opacity: 0;
    transition: all var(--transition-normal) 0.1s;
}

.hamburger-menu.active .menu-header {
    transform: translateY(0);
    opacity: 1;
}

.menu-header h3 {
    color: var(--text-inverse);
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
}

.menu-close {
    background: none;
    border: none;
    color: var(--text-inverse);
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.menu-close:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: scale(1.1);
}

.menu-nav {
    padding: var(--space-lg) 0;
}

.menu-item {
    display: flex;
    align-items: center;
    padding: var(--space-lg) var(--space-xl);
    color: var(--text-inverse);
    text-decoration: none;
    transition: all var(--transition-fast);
}

/*Ajustes*/

/* 1) Asegurar visibilidad de botones "Agregar" en header de sección */
.section-header .add-form {
    transform: none !important;
    opacity: 1 !important;
    box-shadow: var(--shadow-sm);
    min-height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 2) Modal de resultados - solo un scroll general */
.modal.modal-results-type .modal-body {
    overflow-y: auto;
    max-height: 70vh;
}

.modal.modal-results-type .results-container {
    overflow: visible;
    /* Evita scroll interno */
}

/* 3) Botones "Compartir" y "Copiar" mismo ancho */
.modal-button-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    /* dos columnas iguales */
    gap: var(--space-md);
}

.modal-action-btn {
    width: 100%;
    /* Igual ancho en toda pantalla */
    text-align: center;
}

/* 4) Estética app nativa en móvil */
@media (max-width: 900px) {
    body {
        background: var(--surface-primary);
        /* Fondo limpio tipo app */
    }

    .container {
        border-radius: 0;
        /* Fullscreen en móvil */
        min-height: 100vh;
        box-shadow: none;
    }

    .section {
        margin: var(--space-md) var(--space-sm);
        border-radius: var(--radius-lg);
    }

    .modal-content {
        border-radius: var(--radius-xl) var(--radius-xl) 0 0;
        margin-top: auto;
    }
}

/* 5) Lista de excluidos en 2 columnas salvo nombre largo */
.excluded-participants-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    /* dos por fila */
    gap: var(--space-sm);
}

.excluded-participant-item {
    display: flex;
    align-items: center;
    background: var(--surface-secondary);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
    border: 1px solid var(--border-light);
    font-size: 0.875rem;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}

/* Si el nombre es muy largo, forzar ocupación de toda la fila */
.excluded-participant-item span {
    overflow: hidden;
    text-overflow: ellipsis;
}

.excluded-participant-item span.long-name {
    grid-column: span 2;
}

/* Mantener coherencia visual */
.add-form:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/*Mejoras de legibilidad para modal de resultados*/
.modal.modal-results-type .modal-body {
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    /* Espaciado entre bloques */
}

.results-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

/* Bloques de sección */
.results-section {
    background: var(--surface-secondary);
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

/* Ítems de gastos */
.expense-summary-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--divider);
}

.expense-summary-item:last-child {
    border-bottom: none;
}

.expense-desc {
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

.expense-payer {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.excluded-note {
    display: block;
    /* Línea aparte */
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Total de gastos */
.results-total {
    font-size: 1.1rem;
    font-weight: var(--font-weight-bold);
    text-align: center;
    padding: var(--space-md);
    background: var(--surface-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

/* Transferencias */
.transfers-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    /* espacio antes de los botones */
}

.transfer-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm);
    background: var(--surface-primary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
}

/* === Ajuste de altura dinámica y posición de botones en modal de resultados === */

/* El contenedor de resumen se ajusta al contenido y permite scroll general */
.modal.modal-results-type .modal-body {
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    max-height: 70vh;
    padding-bottom: var(--space-lg);
    /* deja espacio para botones */
}

/* El bloque de gastos se expande según su contenido sin forzar scroll interno */
.expenses-summary {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    overflow: visible;
}

/* Botones de acción siempre al final del modal */
.modal.modal-results-type .modal-button-container {
    margin-top: auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

/* Botones iguales */
.modal-action-btn {
    width: 100%;
    text-align: center;
}

/* Asegurar que el texto final ("Generado con Just Pay!") quede debajo de los botones */
.results-footer-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
    margin-top: var(--space-md);
}

/* Asegurar que la estructura del modal use flex-column para fijar header y que el body haga scroll */
.modal-content {
    display: flex;
    flex-direction: column;
    max-height: 85vh;
    height: auto;
    overflow: hidden;
    /* evitar overflow externo */
}

/* Header fijo */
.modal-header {
    flex: 0 0 auto;
}

/* Body toma el espacio restante y es el único que scrollea */
.modal.modal-results-type .modal-body {
    flex: 1 1 auto;
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    overflow-y: auto !important;
    /* scroll único aquí */
    -webkit-overflow-scrolling: touch;
}

/* Forzar que el contenedor de resultados NO tenga scroll propio */
.results-container {
    max-height: none !important;
    overflow: visible !important;
    padding: var(--space-lg);
    background: var(--surface-secondary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-lg);
    border: 1px solid var(--border-light);
}

/* La lista de gastos se expande verticalmente según su contenido */
.expenses-summary {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    overflow: visible !important;
}

/* Mostrar excluidos en línea aparte*/
.expense-summary-item .excluded-note {
    display: block;
    margin-top: 6px;
    color: var(--text-muted);
    font-size: 0.8125rem;
}

/* Transferencias en flujo normal, con margen para separar de botones */
.transfers-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    overflow: visible;
}

/* Asegurar que los botones estén en el flujo y no flotando */
.modal-button-container {
    margin-top: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    flex: 0 0 auto;
    position: relative;
    z-index: 1;
    background: transparent;
    padding-top: var(--space-sm);
}

/* Botones con ancho completo y sin solapamiento */
.modal-action-btn {
    width: 100%;
    text-align: center;
    z-index: 1;
    position: relative;
}

/* MODAL DE RESULTADOS - ESTILOS DE ÍCONOS EN BOTONES*/
#resultsModal .modal-button-container .modal-action-btn i {
    background-color: transparent !important;
}

/* Texto footer siempre después de botones */
.results-footer-text {
    margin-top: var(--space-md);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8125rem;
    flex: 0 0 auto;
}

/* Pequeños ajustes móviles */
@media (max-width: 900px) {
    .modal-content {
        width: 100%;
        max-width: 100%;
        border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    }

    /* Ajustar altura disponible: restar cabecera aproximada (64px) */
    .modal.modal-results-type .modal-body {
        max-height: calc(85vh - 64px);
    }

    .modal-button-container {
        grid-template-columns: 1fr;
    }
}


/* ===============================================
   Ajuste: Alinear modales en móvil arriba para evitar
   que el teclado los tape
   =============================================== */
@media (max-width: 768px) {
    .modal {
        align-items: flex-start !important;
        padding-top: 5vh !important;
        /* margen superior */
    }

    .modal .modal-content {
        margin-top: 0 !important;
    }
}


/* ===============================================
   PRELOADER
   =============================================== */
.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.7s ease, visibility 0.7s ease;
}

.preloader.hidden {
    opacity: 0;
    visibility: hidden;
}

.preloader-content {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.preloader-logo {
    height: 120px;
    /* Aumentado el tamaño del logo */
    width: auto;
    margin-bottom: var(--space-xl);
    /* Añadido espacio entre logo y texto */
    animation: heartbeat-logo 1.5s ease-in-out infinite;
    /* Animación separada para el logo */
}

.preloader-title {
    font-size: 2.5rem;
    /* Aumentado el tamaño del texto */
    color: var(--text-inverse);
    font-family: 'Anton', sans-serif;
    letter-spacing: 1px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    animation: heartbeat-text 1.5s ease-in-out infinite;
    /* Animación separada para el texto */
}

@keyframes heartbeat-logo {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }

    /* Latido más pronunciado */
    100% {
        transform: scale(1);
    }
}

@keyframes heartbeat-text {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }

    /* Ligeramente menos pronunciado para el texto */
    100% {
        transform: scale(1);
    }
}

/* Ocultar contenedor principal al inicio */
.container {
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
}

.container.loaded {
    opacity: 1;
}

/* ===============================================
   NOTIFICACIONES (TOASTS)
   =============================================== */
.toast-notification {
    position: fixed;
    top: var(--space-xl);
    /* <-- CAMBIO: Posicionado arriba */
    left: 50%;

    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-full);
    color: var(--text-inverse);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    text-align: center;
    z-index: 2000;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(5px);

    opacity: 0;
    /* Animación: empieza desplazado hacia arriba y oculto */
    transform: translate(-50%, -20px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    pointer-events: none;
}

.toast-notification.show {
    opacity: 1;
    /* Animación: se desliza hacia abajo a su posición final */
    transform: translate(-50%, 0);
}

/* Estilos por tipo de notificación */
.toast-notification.success {
    background: rgba(16, 185, 129, 0.85);
    /* Verde éxito */
}

.toast-notification.error {
    background: rgba(239, 68, 68, 0.85);
    /* Rojo error */
}

.toast-notification.info {
    background: rgba(15, 23, 42, 0.85);
    /* Color por defecto */
}

/* ===============================================
   FOOTER DE MODAL Y BOTÓN SECUNDARIO
   =============================================== */
.modal-footer {
    padding: var(--space-md) var(--space-xl);
    background: var(--surface-secondary);
    border-top: 1px solid var(--divider);
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: var(--space-md);
    flex-shrink: 0;
}

.secondary-btn {
    background-color: transparent;
    border: 2px solid var(--border-medium);
    color: var(--text-secondary);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-lg);
    font-size: 0.9375rem;
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.secondary-btn:hover {
    background-color: var(--border-light);
    color: var(--text-primary);
    border-color: var(--border-light);
}

/* === FLOATING ACTION BUTTON (FAB) === */
.fab-container {
    position: absolute;
    /* Asegúrate de que sea absolute */
    bottom: calc(var(--space-xl) + 100px);
    /* <-- CAMBIADO: Subimos el FAB 80px más */
    /* Puedes ajustar '80px' a un valor diferente si lo necesitas más alto o más bajo */
    right: var(--space-lg);
    /* O el valor que desees para el margen derecho en móvil */
    z-index: 1000;
}

/* Las reglas para desktop dentro del media query no necesitan cambio */
@media (min-width: 768px) {
    .fab-container {
        .fab-container {
            /* Calculamos la posición para que se alinee con el borde del contenedor */
            right: calc(50% - 260px);
            /* 260px es la mitad del max-width de 520px del container */
        }
    }
}

.fab {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-fab);
    transition: all var(--transition-normal);
    font-size: 1.5rem;
    color: var(--text-inverse);
    background: var(--primary-gradient);
}

.fab:hover {
    transform: scale(1.1) rotate(90deg);
    box-shadow: var(--shadow-lg);
}

/* BARRA DE ACCIÓN INFERIOR */
.action-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    background: var(--surface-primary);
    border-top: 1px solid var(--divider);
    flex-shrink: 0;
    margin-top: auto;
}

.action-bar-total {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.action-bar-total span:last-child {
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-left: var(--space-sm);
}

.action-bar .calculate-btn {
    padding: var(--space-md) var(--space-lg);
    font-size: 1rem;
    min-width: auto;
    background: var(--calculate-gradient);
    color: var(--text-inverse);
    border: none;
    border-radius: var(--radius-full);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.action-bar .calculate-btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.calculate-btn .spinner {
    display: none;
    /* Oculto por defecto */
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

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

/* Estado de carga del botón */
.calculate-btn.loading .spinner {
    display: block;
    /* Muestra el spinner */
}

.calculate-btn.loading .btn-text {
    display: none;
    /* Oculta el texto */
}


/* Bloque para el texto en "Acerca de" */
.info-card-text {
    background: var(--surface-secondary);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    margin-top: var(--space-lg);
    border: 1px solid var(--border-light);
}

/* Espacio entre los párrafos dentro del bloque de texto */
.info-card-text p {
    margin-bottom: var(--space-md);
}

.info-card-text p:last-child {
    margin-bottom: 0;
}

/* Bloque para el logo de GitHub */
.info-card-logo {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: var(--space-md);
    padding: var(--space-sm);
    border: 1px solid var(--border-light);
}

.info-card-logo i {
    font-size: 2rem;
    color: var(--text-primary);
    transition: transform var(--transition-fast);
}

.info-card-logo i:hover {
    transform: scale(1.1);
}

/* Estilos generales para las tarjetas de "Contacto" */
.info-card {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    background: var(--surface-secondary);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    margin-top: var(--space-lg);
    border: 1px solid var(--border-light);
}

.info-card i {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.info-card-logo a {
    text-decoration: none;
}

/* Estilos para el modal de Ayuda (se mantienen) */
.help-steps {
    list-style: none;
    padding: 0;
}

.help-steps li {
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--divider);
}

.help-steps li:last-child {
    border-bottom: none;
}

.help-steps h4 {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: 1.1rem;
    margin-bottom: var(--space-xs);
}

.help-steps h4 span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-gradient);
    color: var(--text-inverse);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    font-size: 0.9rem;
}

.help-steps p {
    padding-left: calc(24px + var(--space-md));
    color: var(--text-secondary);
}


/* ==========================================================
   ANCHO DE MODAL Y CONTENEDOR GENERAl
   ========================================================== */

/* --- Base (Móvil) --- */
.container {
    max-width: 420px;
}

.modal-content {
    width: 100%;
    /* Hace que el modal sea flexible */
    max-width: 420px;
}

/* --- Tablet --- */
@media (min-width: 768px) {

    .container,
    .modal-content {
        max-width: 520px;
    }
}

/* --- Escritorio --- */
@media (min-width: 1024px) {

    .container,
    .modal-content {
        max-width: 580px;
    }

    .fab-container {
        right: calc(50% - 290px - var(--space-lg));
        bottom: var(--space-2xl); 
    }
}