@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* =============================================
   Variables y configuración base
   Paleta: #192640 (azul oscuro), #F2541B (naranja), #FFFFFF (blanco)
   ============================================= */
:root {
    --primary-color: #192640;
    --primary-dark: #0f1829;
    --accent-color: #F2541B;
    --accent-dark: #d94815;
    --accent-light: #ff6a35;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #3b82f6;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --border-radius: 0.75rem;
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

body {
    background-color: #ffffff;
    margin: 0;
    padding: 2rem 1rem;
}

/* =============================================
   Contenedor principal
   ============================================= */
.power-calculator {
    max-width: 1200px;
    margin: 0 auto;
}

/* =============================================
   Estilos de formularios
   ============================================= */
.power-calculator select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23192640%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
    background-repeat: no-repeat;
    background-position: right 0.7em top 50%;
    background-size: 0.65em auto;
    padding-right: 2.5em;
}

input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type=number] {
    -moz-appearance: textfield;
}

.form-input,
.form-select {
    display: block;
    width: 100%;
    padding: 0.625rem;
    border: 1px solid var(--gray-300);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-sm);
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
    font-size: 0.9375rem;
    color: var(--gray-800);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(242, 84, 27, 0.2);
}

/* =============================================
   Tooltips
   ============================================= */
.tooltip-container {
    position: relative;
    display: inline-flex;
    align-items: center;
}

.tooltip {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    margin-bottom: 8px;
    padding: 8px 12px;
    background-color: var(--primary-color);
    color: white;
    font-size: 0.75rem;
    border-radius: 6px;
    white-space: normal;
    width: 250px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

.tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--primary-color);
}

.tooltip-container:hover .tooltip {
    opacity: 1;
    visibility: visible;
}

/* =============================================
   Header
   ============================================= */
.card-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border-radius: 1rem 1rem 0 0;
    padding: 2rem;
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
}

.card-header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 300px;
    height: 300px;
    background: #ffffff;
    border-radius: 50%;
    opacity: 0.2;
}

.card-header::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 200px;
    height: 200px;
    background: #ffffff;
    border-radius: 50%;
    opacity: 0.2;
}

.card-header h1 {
    font-size: 1.875rem;
    font-weight: 700;
    text-align: center;
    margin: 0 0 0.5rem 0;
    position: relative;
    z-index: 1;
}

.card-header h2 {
    font-size: 1.25rem;
    text-align: center;
    opacity: 0.9;
    margin: 0;
    font-weight: 400;
    position: relative;
    z-index: 1;
}

.card-header p {
    text-align: justify;
    font-size: 0.875rem;
    margin-top: 1rem;
    opacity: 0.8;
    position: relative;
    z-index: 1;
}

@media (min-width: 768px) {
    .card-header h1 {
        font-size: 2.25rem;
    }
    .card-header h2 {
        font-size: 1.5rem;
    }
}

/* =============================================
   Main card
   ============================================= */
.main-card {
    background: white;
    border-radius: 0 0 1rem 1rem;
    box-shadow: var(--shadow-xl);
    padding: 1.5rem;
    border: 1px solid var(--gray-200);
    border-top: none;
}

@media (min-width: 768px) {
    .main-card {
        padding: 2rem;
    }
}

/* =============================================
   Secciones
   ============================================= */
.section-header {
    display: flex;
    align-items: center;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.section-header svg {
    width: 1.5rem;
    height: 1.5rem;
    margin-right: 0.5rem;
    color: var(--accent-color);
}

.section-divider {
    border-top: 2px solid var(--gray-200);
    margin: 2rem 0;
}

/* =============================================
   Equipos
   ============================================= */
.equipment-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.equipment-item {
    background: linear-gradient(to right, var(--gray-50), white);
    padding: 1rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-200);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.equipment-item:hover {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 1px rgba(242, 84, 27, 0.1);
}

.equipment-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
    align-items: center;
}

@media (min-width: 768px) {
    .equipment-grid {
        grid-template-columns: 3fr 2fr 2fr 2fr 2fr 1fr;
    }
}

.starter-container {
    display: none;
}

.starter-container.visible {
    display: block;
}

/* Contenedor de unidad de potencia por equipo */
.power-input-container {
    display: flex;
    gap: 0.5rem;
}

.power-input-container .form-input {
    flex: 1;
}

.power-input-container .unit-display {
    display: flex;
    align-items: center;
    padding: 0 0.75rem;
    background: var(--gray-100);
    border: 1px solid var(--gray-300);
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
    min-width: 50px;
    justify-content: center;
}

/* =============================================
   Botones
   ============================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: 0.5rem;
    border: none;
    cursor: pointer;
    transition: all 0.15s ease-in-out;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-dark) 100%);
    color: white;
    box-shadow: var(--shadow-lg), 0 4px 14px 0 rgba(242, 84, 27, 0.35);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent-color) 100%);
    transform: translateY(-1px);
    box-shadow: var(--shadow-xl), 0 6px 20px 0 rgba(242, 84, 27, 0.4);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-success:hover {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    transform: translateY(-1px);
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
    padding: 0.625rem;
}

.btn-danger:hover {
    background-color: #dc2626;
}

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

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

.btn-whatsapp {
    background: linear-gradient(135deg, #25D366 0%, #128C7E 100%);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-whatsapp:hover {
    background: linear-gradient(135deg, #128C7E 0%, #075E54 100%);
    transform: translateY(-1px);
}

.btn-block {
    width: 100%;
}

.btn-lg {
    padding: 1rem 1.5rem;
    font-size: 1.125rem;
}

/* =============================================
   Grid de configuración
   ============================================= */
.config-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

@media (min-width: 768px) {
    .config-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .config-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.config-grid-3 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

@media (min-width: 768px) {
    .config-grid-3 {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Contenedor de tipo de motor (condicional) */
.engine-type-container {
    display: none;
}

.engine-type-container.visible {
    display: block;
}

/* =============================================
   Advertencias
   ============================================= */
.warnings-container {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.warning {
    padding: 1rem;
    border-radius: 0.5rem;
    border-width: 2px;
    border-style: solid;
}

.warning-orange {
    background-color: #fffbeb;
    border-color: #fcd34d;
    color: #92400e;
}

.warning-blue {
    background-color: #eff6ff;
    border-color: #93c5fd;
    color: #1e40af;
}

.warning-red {
    background-color: #fef2f2;
    border-color: #fca5a5;
    color: #991b1b;
}

.warning-content {
    display: flex;
    align-items: flex-start;
}

.warning-content svg {
    width: 1.25rem;
    height: 1.25rem;
    margin-right: 0.75rem;
    flex-shrink: 0;
    margin-top: 0.125rem;
}

.warning-content span {
    font-size: 0.875rem;
}

/* =============================================
   Resultados
   ============================================= */
.results-section {
    margin-top: 2rem;
    padding: 2rem;
    background: linear-gradient(135deg, rgba(25, 38, 64, 0.03) 0%, rgba(242, 84, 27, 0.03) 100%);
    border-radius: 1rem;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--gray-200);
}

.results-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

.results-title svg {
    width: 2rem;
    height: 2rem;
    margin-right: 0.5rem;
    color: var(--accent-color);
}

/* =============================================
   Tarjetas de resumen
   ============================================= */
.summary-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}

@media (min-width: 768px) {
    .summary-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .summary-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.summary-card {
    padding: 1.5rem;
    border-radius: var(--border-radius);
    color: white;
    box-shadow: var(--shadow-lg);
}

.summary-card-blue {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
}

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

.summary-card-pink {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-dark) 100%);
}

.summary-card-orange {
    background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
}

.summary-card .label {
    font-size: 0.875rem;
    opacity: 0.9;
    margin-bottom: 0.25rem;
}

.summary-card .value {
    font-size: 1.875rem;
    font-weight: 700;
}

.summary-card .unit {
    font-size: 0.75rem;
    opacity: 0.8;
    margin-top: 0.25rem;
}

/* =============================================
   Desglose detallado
   ============================================= */
.breakdown-section {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
    border: 1px solid var(--gray-200);
}

.breakdown-section h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0 0 1rem 0;
}

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

@media (min-width: 768px) {
    .breakdown-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.breakdown-item {
    background: var(--gray-50);
    padding: 1rem;
    border-radius: 0.5rem;
    border: 1px solid var(--gray-200);
}

.breakdown-item .label {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-bottom: 0.25rem;
}

.breakdown-item .value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.breakdown-item .value.orange {
    color: var(--accent-color);
}

.breakdown-item .value.blue {
    color: #2563eb;
}

/* =============================================
   Gráfico
   ============================================= */
.chart-section {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
    border: 1px solid var(--gray-200);
}

.chart-section h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0 0 1rem 0;
}

/* =============================================
   Recomendaciones
   ============================================= */
.recommendations-section {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.08) 0%, rgba(16, 185, 129, 0.04) 100%);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    border: 2px solid #a7f3d0;
}

.recommendations-section h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #065f46;
    margin: 0 0 1rem 0;
    display: flex;
    align-items: center;
}

.recommendations-section h3 svg {
    width: 1.75rem;
    height: 1.75rem;
    margin-right: 0.5rem;
}

.recommendations-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.recommendation-card {
    background: white;
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: box-shadow 0.15s ease-in-out, border-color 0.15s ease-in-out;
}

.recommendation-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-color);
}

.recommendation-card.recommended {
    border-color: #34d399;
}

.recommendation-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
}

.recommendation-header h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
}

.recommendation-header p {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin: 0;
}

.badge-recommended {
    background-color: var(--success-color);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
}

.recommendation-specs {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1rem;
}

.recommendation-specs .spec-label {
    font-size: 0.75rem;
    color: var(--gray-600);
}

.recommendation-specs .spec-value {
    font-size: 1.125rem;
    font-weight: 700;
}

.recommendation-specs .spec-value.purple {
    color: var(--accent-color);
}

.recommendation-specs .spec-value.blue {
    color: var(--primary-color);
}

.efficiency-bar {
    margin-bottom: 1rem;
}

.efficiency-bar .bar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.25rem;
}

.efficiency-bar .bar-header span {
    font-size: 0.75rem;
    color: var(--gray-600);
}

.efficiency-bar .bar-header strong {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--gray-700);
}

.efficiency-bar .bar-bg {
    width: 100%;
    height: 0.5rem;
    background-color: var(--gray-200);
    border-radius: 9999px;
    overflow: hidden;
}

.efficiency-bar .bar-fill {
    height: 100%;
    border-radius: 9999px;
    transition: width 0.3s ease-in-out;
}

.efficiency-bar .bar-fill.green {
    background-color: var(--success-color);
}

.efficiency-bar .bar-fill.orange {
    background-color: var(--accent-color);
}

.efficiency-bar .bar-fill.blue {
    background-color: var(--primary-color);
}

.efficiency-badge {
    display: inline-block;
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    margin-top: 0.5rem;
}

.efficiency-badge.green {
    background-color: #dcfce7;
    color: #166534;
}

.efficiency-badge.orange {
    background-color: #fff7ed;
    color: #9a3412;
}

.efficiency-badge.blue {
    background-color: #e0e7ff;
    color: var(--primary-color);
}

.adjustments-info {
    font-size: 0.75rem;
    color: var(--gray-600);
    padding: 0.75rem;
    background-color: var(--gray-50);
    border-radius: 0.5rem;
    margin-bottom: 0.75rem;
    border: 1px solid var(--gray-200);
}

.contact-card {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.contact-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -30%;
    width: 200px;
    height: 200px;
    background: var(--accent-color);
    border-radius: 50%;
    opacity: 0.1;
}

.contact-card h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0 0 0.5rem 0;
    position: relative;
    z-index: 1;
}

.contact-card p {
    margin: 0 0 1rem 0;
    color: rgba(255, 255, 255, 0.8);
    position: relative;
    z-index: 1;
}

.contact-card a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: #25D366;
    color: white;
    font-weight: 700;
    padding: 0.75rem 2rem;
    border-radius: 0.5rem;
    text-decoration: none;
    transition: all 0.15s ease-in-out;
    position: relative;
    z-index: 1;
}

.contact-card a:hover {
    background-color: #128C7E;
    transform: translateY(-2px);
}

.contact-card a svg {
    width: 1.25rem;
    height: 1.25rem;
}

.results-note {
    font-size: 0.75rem;
    color: var(--gray-600);
    font-style: italic;
    margin-top: 1.5rem;
}

/* =============================================
   Botón de exportar
   ============================================= */
.export-section {
    margin-top: 1.5rem;
    text-align: center;
}

/* =============================================
   Modal
   ============================================= */
.modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(25, 38, 64, 0.6);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    padding: 1rem;
    backdrop-filter: blur(4px);
}

.modal-overlay.visible {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 1rem;
    box-shadow: var(--shadow-xl);
    max-width: 28rem;
    width: 100%;
    padding: 1.5rem;
    animation: slideIn 0.3s ease-out;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.875rem;
    color: var(--gray-400);
    cursor: pointer;
    line-height: 1;
    padding: 0;
    transition: color 0.15s ease;
}

.modal-close:hover {
    color: var(--accent-color);
}

.modal-body {
    color: var(--gray-700);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.modal-body a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
}

.modal-body a:hover {
    text-decoration: underline;
}

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

/* =============================================
   Animaciones
   ============================================= */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-slide-in {
    animation: slideIn 0.3s ease-out;
}

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

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

.mb-4 {
    margin-bottom: 1rem;
}

.mb-8 {
    margin-bottom: 2rem;
}

.flex {
    display: flex;
}

.items-center {
    align-items: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-3 {
    gap: 0.75rem;
}

/* =============================================
   Labels
   ============================================= */
.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

/* =============================================
   Icono de ayuda
   ============================================= */
.help-icon {
    color: var(--gray-400);
    cursor: help;
    margin-left: 0.5rem;
    transition: color 0.15s ease;
}

.help-icon:hover {
    color: var(--accent-color);
}

/* =============================================
   Estilos de impresión
   ============================================= */
@media print {
    body {
        background: white;
        padding: 0;
    }

    .card-header {
        background: var(--primary-color) !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    .btn,
    .export-section {
        display: none !important;
    }

    .results-section {
        break-inside: avoid;
    }

    .summary-card {
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
}