/* ============================================
   CALCULADORA FINANCIERA - SISTEMA DE DISEÑO
   ============================================ */

/* === VARIABLES CSS (TEMA CLARO Y OSCURO) === */
:root {
    /* Colores primarios - Fintech azul/morado */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --accent-color: #764ba2;

    /* Colores de fondo */
    --bg-primary: #f8f9fe;
    --bg-secondary: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.9);

    /* Colores de texto */
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-muted: #718096;

    /* Colores de borde */
    --border-color: #e2e8f0;
    --border-focus: #667eea;

    /* Colores de estado */
    --success-color: #48bb78;
    --error-color: #f56565;
    --warning-color: #ed8936;

    /* Sombras */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);

    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.3);
    --backdrop-blur: blur(10px);

    /* Espaciado */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Bordes redondeados */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transiciones */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Tema oscuro */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: rgba(30, 41, 59, 0.9);

    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;

    --border-color: #334155;
    --border-focus: #667eea;

    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.4);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* === CONTENEDOR PRINCIPAL === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    width: 2.5rem;
    height: 2.5rem;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Toggle de tema */
.theme-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
}

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

.theme-toggle:focus {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
}

.theme-toggle svg {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--text-primary);
}

.sun-icon {
    display: block;
}

.moon-icon {
    display: none;
}

[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="dark"] .moon-icon {
    display: block;
}

/* === CONTENIDO PRINCIPAL === */
.main-content {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

/* === CARDS === */
.calculator-card,
.results-card {
    background: var(--glass-bg);
    backdrop-filter: var(--backdrop-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
}

.calculator-card:hover,
.results-card:hover {
    box-shadow: var(--shadow-xl);
}

.card-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.card-subtitle {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    font-size: 0.95rem;
}

/* === FORMULARIO === */
.calculator-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.label-value {
    margin-left: auto;
    background: var(--primary-gradient);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 600;
}

.required {
    color: var(--error-color);
}

/* Input wrapper para prefijos/sufijos */
.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-prefix,
.input-suffix {
    position: absolute;
    color: var(--text-muted);
    font-weight: 500;
    pointer-events: none;
}

.input-prefix {
    left: var(--spacing-md);
}

.input-suffix {
    right: var(--spacing-md);
}

/* Inputs de texto */
.form-input {
    width: 100%;
    padding: var(--spacing-md);
    padding-left: 2.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition-base);
}

.form-input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

.form-input.error {
    border-color: var(--error-color);
}

.form-input.error:focus {
    box-shadow: 0 0 0 3px rgba(245, 101, 101, 0.1);
}

/* Range slider */
.form-range {
    width: 100%;
    height: 0.5rem;
    border-radius: var(--radius-lg);
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

.form-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    background: var(--primary-gradient);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.form-range::-moz-range-thumb {
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    background: var(--primary-gradient);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    border: none;
    transition: all var(--transition-base);
}

.form-range::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.form-range::-moz-range-thumb:hover {
    transform: scale(1.1);
}

.form-range:focus::-webkit-slider-thumb {
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.2);
}

.form-range:focus::-moz-range-thumb {
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.2);
}

.range-labels {
    display: flex;
    justify-content: space-between;
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: var(--spacing-xs);
}

/* Radio buttons personalizados */
.interest-type-fieldset {
    border: none;
    padding: 0;
}

.radio-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.radio-label {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--bg-secondary);
}

.radio-label:hover {
    border-color: var(--primary-color);
    background: var(--bg-card);
}

.radio-input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.radio-custom {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    position: relative;
    flex-shrink: 0;
    transition: all var(--transition-base);
    margin-top: 0.125rem;
}

.radio-input:checked~.radio-custom {
    border-color: var(--primary-color);
    background: var(--primary-gradient);
}

.radio-input:checked~.radio-custom::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: white;
}

.radio-input:focus~.radio-custom {
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.radio-text {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.radio-text strong {
    color: var(--text-primary);
    font-size: 0.95rem;
}

.radio-text small {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* Mensajes de error */
.error-message {
    color: var(--error-color);
    font-size: 0.85rem;
    display: none;
    align-items: center;
    gap: var(--spacing-xs);
    margin-top: 0.25rem;
}

.error-message.show {
    display: flex;
}

.error-message::before {
    content: '⚠';
}

/* Botón de reset */
.btn-reset {
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.btn-reset svg {
    width: 1.25rem;
    height: 1.25rem;
}

.btn-reset:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(102, 126, 234, 0.05);
}

.btn-reset:focus {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
}

/* === RESULTADOS === */
.results-card {
    animation: fadeIn var(--transition-slow);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.results-grid {
    display: grid;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.result-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    transition: all var(--transition-base);
}

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

.result-primary {
    background: var(--primary-gradient);
    border: none;
    color: white;
}

.result-primary .result-label,
.result-primary .result-value {
    color: white;
}

.result-icon {
    width: 3rem;
    height: 3rem;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.result-item:not(.result-primary) .result-icon {
    background: var(--bg-card);
}

.result-icon svg {
    width: 1.5rem;
    height: 1.5rem;
    color: currentColor;
}

.result-content {
    flex: 1;
}

.result-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
    font-weight: 500;
}

.result-primary .result-label {
    color: rgba(255, 255, 255, 0.9);
}

.result-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    animation: countUp var(--transition-slow);
}

@keyframes countUp {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Información adicional */
.results-info {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.info-text {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.info-text svg {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--primary-color);
    flex-shrink: 0;
}

/* === FOOTER === */
.footer {
    text-align: center;
    padding: var(--spacing-lg) 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
}

/* === RESPONSIVE DESIGN === */
@media (min-width: 768px) {
    .container {
        padding: var(--spacing-xl);
    }

    .main-content {
        grid-template-columns: 1fr 1fr;
        align-items: start;
    }

    .logo h1 {
        font-size: 1.75rem;
    }

    .card-title {
        font-size: 2rem;
    }

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

@media (min-width: 1024px) {
    .radio-group {
        flex-direction: row;
    }

    .radio-label {
        flex: 1;
    }
}

/* === ANIMACIONES DE MICRO-INTERACCIÓN === */
@media (prefers-reduced-motion: no-preference) {

    .form-input:focus,
    .radio-label:hover,
    .btn-reset:hover,
    .theme-toggle:hover {
        transition: all var(--transition-base);
    }
}

/* Accesibilidad: respeta preferencias de movimiento reducido */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}