/* --- Variables y Setup Básico --- */
:root {
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    --spacing-base: 8px;

    /* Light Theme (Default) */
    --color-background: #f0f2f5;
    --color-surface: #ffffff;
    --color-text-primary: #1c1e21;
    --color-text-secondary: #65676b;
    --color-border: #dce1e4;
    --color-accent: #0866ff;
    --color-shadow: rgba(0, 0, 0, 0.05);
    
    --color-badge-red: #fa383e;
    --color-badge-yellow: #f5c32d;
    --color-badge-green: #45bd62;
    --color-badge-neutral: #8a8d91;
}

[data-theme="dark"] {
    --color-background: #18191a;
    --color-surface: #242526;
    --color-text-primary: #e4e6eb;
    --color-text-secondary: #b0b3b8;
    --color-border: #3a3b3c;
    --color-accent: #2374e1;
    --color-shadow: rgba(0, 0, 0, 0.2);

    --color-badge-red: #e84c4f;
    --color-badge-yellow: #f0b721;
    --color-badge-green: #54c771;
    --color-badge-neutral: #a0a3a7;
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-background);
    color: var(--color-text-primary);
    line-height: 1.6;
    transition: background-color 150ms ease-in-out, color 150ms ease-in-out;
}

/* --- Layout y Contenedor Principal --- */
.container {
    max-width: 720px;
    margin: 0 auto;
    padding: calc(var(--spacing-base) * 3);
    display: grid;
    gap: calc(var(--spacing-base) * 3);
}

.header, .footer {
    padding: calc(var(--spacing-base) * 2) calc(var(--spacing-base) * 3);
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    transition: background-color 150ms ease-in-out, border-color 150ms ease-in-out;
}

.header__content {
    max-width: 720px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    font-size: 1.25rem;
    font-weight: 600;
}

.footer {
    border-top: 1px solid var(--color-border);
    border-bottom: none;
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

/* --- Tarjetas (Cards) --- */
.card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: calc(var(--spacing-base) * 3);
    box-shadow: 0 2px 4px var(--color-shadow);
    transition: background-color 150ms ease-in-out, border-color 150ms ease-in-out;
}

/* --- Formulario --- */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: calc(var(--spacing-base) * 2);
}

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

.form-group label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-base);
}

.form-group input {
    width: 100%;
    padding: calc(var(--spacing-base) * 1.5);
    font-size: 1rem;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    background-color: var(--color-background);
    color: var(--color-text-primary);
    line-height: 1.5;
    transition: border-color 150ms ease-in-out, box-shadow 150ms ease-in-out;
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 2px color-mix(in srgb, var(--color-accent) 25%, transparent);
}

.form-group input::placeholder {
    color: var(--color-text-secondary);
    opacity: 0.7;
}

/* --- Resultados --- */
.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: calc(var(--spacing-base) * 3);
}

.card--result {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-base);
}

.card--caprate {
    grid-column: 1 / -1; /* Ocupa todo el ancho */
    border-top: 4px solid var(--color-badge-neutral);
    transition: border-top-color 150ms ease-in-out;
}

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

.card__title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-secondary);
}

.card__value {
    font-weight: 300;
    font-size: 2rem;
    color: var(--color-text-primary);
}

.card__value--large {
    font-size: 3rem;
    font-weight: 600;
}

.card__subtitle {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-top: auto; /* Empuja al fondo */
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: var(--spacing-base) 0;
    border-bottom: 1px solid var(--color-border);
}
.result-item:last-child {
    border-bottom: none;
}

.result-item__label {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.result-item__value {
    font-weight: 500;
    font-size: 1.1rem;
}

.gastos-breakdown {
    list-style: none;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    padding-left: var(--spacing-base);
    margin-top: var(--spacing-base);
}

.gastos-breakdown li {
    display: flex;
    justify-content: space-between;
}

/* --- Badge de Cap Rate --- */
.badge {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--color-badge-neutral);
    transition: background-color 150ms ease-in-out;
}

.badge.red { background-color: var(--color-badge-red); }
.badge.yellow { background-color: var(--color-badge-yellow); }
.badge.green { background-color: var(--color-badge-green); }

#caprate-card.red { border-top-color: var(--color-badge-red); }
#caprate-card.yellow { border-top-color: var(--color-badge-yellow); }
#caprate-card.green { border-top-color: var(--color-badge-green); }

/* --- Acordeones --- */
.accordion-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-base);
}

.accordion {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    transition: background-color 150ms ease-in-out, border-color 150ms ease-in-out;
}

.accordion__button {
    width: 100%;
    background: none;
    border: none;
    padding: calc(var(--spacing-base) * 2);
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-primary);
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.accordion__button:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: 6px;
}

.accordion__button::after {
    content: '+';
    font-size: 1.5rem;
    font-weight: 300;
    transition: transform 150ms ease-in-out;
}

.accordion__button[aria-expanded="true"]::after {
    transform: rotate(45deg);
}

.accordion__content {
    padding: 0 calc(var(--spacing-base) * 2) calc(var(--spacing-base) * 2);
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.accordion__content p, .accordion__content ul {
    margin-bottom: var(--spacing-base);
}
.accordion__content ul {
    padding-left: calc(var(--spacing-base) * 2.5);
}
.accordion__content code {
    background-color: var(--color-background);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
}

/* --- Toggle de Tema --- */
.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.5rem;
    padding: 4px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}
.theme-toggle:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.theme-toggle__icon { display: none; }

html[data-theme="light"] .theme-toggle__icon--sun { display: block; }
html[data-theme="dark"] .theme-toggle__icon--moon { display: block; }

/* --- Responsive --- */
@media (max-width: 600px) {
    .form-grid, .results-grid {
        grid-template-columns: 1fr;
    }
    .card--caprate {
        grid-column: auto; /* Reset */
    }
    .header h1 {
        font-size: 1.1rem;
    }
    .card__value--large {
        font-size: 2.5rem;
    }
}