/* ==========================================================================
   CalculadorasRD.com - Core Styles & Design System (Minimalist & Premium)
   ========================================================================== */

/* Import modern typography */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

/* CSS Variables for Dynamic Themes */
:root {
  /* Common tokens */
  --font-heading: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;

  /* HSL bases for flexible styling */
  --hue-primary: 215; /* Electric Blue */
  --hue-success: 142; /* Emerald Green */
  --hue-danger: 350;  /* Rose Red */
  --hue-warning: 38;   /* Amber */

  /* Light Theme Default Colors */
  --bg-app: #f6f8fc;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  --bg-input: #ffffff;
  --border-color: rgba(226, 232, 240, 0.8);
  --border-focus: hsla(var(--hue-primary), 85%, 55%, 0.5);
  
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --color-primary: hsl(var(--hue-primary), 85%, 50%);
  --color-primary-light: hsl(var(--hue-primary), 85%, 95%);
  --color-primary-dark: hsl(var(--hue-primary), 85%, 40%);
  
  --color-success: hsl(var(--hue-success), 75%, 40%);
  --color-success-light: hsl(var(--hue-success), 75%, 95%);
  
  --color-danger: hsl(var(--hue-danger), 75%, 50%);
  --color-danger-light: hsl(var(--hue-danger), 75%, 95%);
  
  --color-warning: hsl(var(--hue-warning), 80%, 45%);
  
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 50px rgba(15, 23, 42, 0.12);
  --shadow-inset: inset 0 2px 4px rgba(0, 0, 0, 0.02);

  --glass-bg: rgba(255, 255, 255, 0.75);
  --glass-border: rgba(255, 255, 255, 0.4);
  
  --ad-bg: #f1f5f9;
  --ad-border: #cbd5e1;
  --ad-text: #94a3b8;
}

/* Dark Theme Variables */
[data-theme="dark"] {
  --bg-app: #070a13;
  --bg-card: rgba(19, 26, 42, 0.8);
  --bg-card-hover: rgba(24, 33, 53, 0.9);
  --bg-input: #121826;
  --border-color: rgba(30, 41, 59, 0.7);
  --border-focus: hsla(var(--hue-primary), 80%, 65%, 0.6);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-inverse: #0f172a;

  --color-primary: hsl(var(--hue-primary), 85%, 60%);
  --color-primary-light: hsla(var(--hue-primary), 85%, 60%, 0.1);
  --color-primary-dark: hsl(var(--hue-primary), 85%, 70%);
  
  --color-success: hsl(var(--hue-success), 70%, 50%);
  --color-success-light: hsla(var(--hue-success), 70%, 50%, 0.1);
  
  --color-danger: hsl(var(--hue-danger), 75%, 60%);
  --color-danger-light: hsla(var(--hue-danger), 75%, 60%, 0.1);
  
  --color-warning: hsl(var(--hue-warning), 85%, 55%);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 10px 35px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 25px 60px rgba(0, 0, 0, 0.5);
  --shadow-inset: inset 0 2px 4px rgba(0, 0, 0, 0.25);

  --glass-bg: rgba(13, 20, 35, 0.8);
  --glass-border: rgba(255, 255, 255, 0.05);

  --ad-bg: #111827;
  --ad-border: #1f2937;
  --ad-text: #4b5563;
}

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

html {
  font-family: var(--font-body);
  color: var(--text-main);
  background-color: var(--bg-app);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-image: 
    radial-gradient(at 0% 0%, hsla(var(--hue-primary), 75%, 60%, 0.08) 0, transparent 50%),
    radial-gradient(at 100% 100%, hsla(var(--hue-success), 75%, 60%, 0.05) 0, transparent 50%);
  background-attachment: fixed;
  overflow-x: hidden;
}

/* Premium Typography Helper Classes */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-normal);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-main);
}

.site-logo span {
  background: linear-gradient(135deg, var(--color-primary), hsl(var(--hue-success), 75%, 50%));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.site-logo .flag {
  font-style: normal;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.5rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-links a:hover,
.nav-links li.active a {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

/* Theme Toggle Button */
.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.5rem;
  border-radius: 50%;
  cursor: pointer;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
  background-color: var(--bg-card);
}

.theme-toggle:hover {
  border-color: var(--color-primary);
  box-shadow: 0 0 10px rgba(59, 130, 246, 0.2);
}

.theme-toggle .sun-icon { display: block; }
.theme-toggle .moon-icon { display: none; }

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

/* Mobile Navigation Toggle */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ==========================================================================
   Main Content Layout
   ========================================================================== */
.main-content {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.dashboard-hero {
  text-align: center;
  margin-bottom: 3rem;
  padding: 3rem 1rem;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--color-primary-light) 0%, transparent 100%);
}

.dashboard-hero h1 {
  font-size: 2.75rem;
  margin-bottom: 0.75rem;
}

.dashboard-hero p {
  color: var(--text-muted);
  font-size: 1.15rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Grid layout for Dashboard Calculators */
.calculators-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.calc-card-link {
  text-decoration: none;
  color: inherit;
}

.calc-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  height: 100%;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.calc-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), hsl(var(--hue-success), 75%, 50%));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.calc-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-md);
  background-color: var(--bg-card-hover);
}

.calc-card:hover::after {
  opacity: 1;
}

.calc-card .icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: bold;
}

.calc-card h2 {
  font-size: 1.25rem;
}

.calc-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
  flex-grow: 1;
}

.calc-card .btn-link {
  align-self: flex-start;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* ==========================================================================
   Calculator Page Layout (Form on left, Results on right)
   ========================================================================== */
.calculator-container {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 900px) {
  .calculator-container {
    grid-template-columns: 1fr;
  }
}

.calculator-main {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  transition: background-color var(--transition-normal);
}

.calculator-title-area {
  margin-bottom: 2rem;
}

.calculator-title-area h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.calculator-title-area p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.calculator-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: sticky;
  top: 90px;
}

/* Form Styles */
.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.input-container {
  position: relative;
  display: flex;
  align-items: center;
}

.input-prefix {
  position: absolute;
  left: 1rem;
  color: var(--text-muted);
  font-weight: 600;
  pointer-events: none;
  font-size: 0.95rem;
}

.form-control {
  width: 100%;
  padding: 0.85rem 1rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-main);
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-inset);
  transition: all var(--transition-normal);
}

.input-container .form-control {
  padding-left: 2.25rem;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px var(--border-focus);
}

/* Radio Button Group (Buttons Segmented Control) */
.segmented-control {
  display: flex;
  background-color: var(--bg-app);
  border: 1px solid var(--border-color);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  gap: 0.25rem;
}

.segmented-control label {
  flex: 1;
  text-align: center;
  margin-bottom: 0;
  cursor: pointer;
}

.segmented-control input[type="radio"] {
  display: none;
}

.segmented-control span {
  display: block;
  padding: 0.6rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.segmented-control input[type="radio"]:checked + span {
  background-color: var(--bg-card);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

/* Slider Controls */
.slider-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

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

.slider-val {
  font-weight: 700;
  color: var(--color-primary);
}

.form-range {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: var(--border-color);
  border-radius: 3px;
  outline: none;
}

.form-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  transition: transform var(--transition-fast);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.form-range::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

/* Double column form layouts */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 600px) {
  .form-row {
    grid-template-columns: 1fr;
    gap: 0;
  }
}

/* Action Button */
.btn-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 0.9rem;
  background-color: var(--color-primary);
  color: var(--text-inverse);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(59, 130, 246, 0.45);
}

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

/* ==========================================================================
   Results Styles
   ========================================================================== */
.results-card {
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(59, 130, 246, 0.03) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  transition: background-color var(--transition-normal);
}

.results-heading {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.main-result {
  margin-bottom: 2rem;
  text-align: center;
}

.main-result-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.main-result-value {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-primary);
  word-break: break-all;
}

.results-breakdown {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.breakdown-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.95rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px dashed var(--border-color);
}

.breakdown-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.breakdown-row.total-row {
  font-weight: 700;
  font-size: 1.1rem;
  border-top: 1px solid var(--border-color);
  border-bottom: none;
  padding-top: 0.75rem;
}

.breakdown-value {
  font-family: var(--font-heading);
  font-weight: 600;
}

.breakdown-row.total-row .breakdown-value {
  color: var(--color-primary);
}

/* ==========================================================================
   Tablas & Amortización (Loans/Prestaciones details)
   ========================================================================== */
.table-container {
  width: 100%;
  overflow-x: auto;
  margin-top: 2rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}

.data-table th {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 700;
  font-family: var(--font-heading);
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

.data-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
  background-color: var(--bg-card);
}

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

.data-table tr:hover td {
  background-color: var(--bg-card-hover);
}

/* ==========================================================================
   SEO content (Debajo de la calculadora)
   ========================================================================== */
.seo-section {
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border-color);
}

.seo-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 2rem;
}

.seo-card h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-main);
  position: relative;
}

.seo-card p, .seo-card li {
  font-size: 0.975rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.seo-card ul, .seo-card ol {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

.seo-card code {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.9rem;
}

/* Accordion FAQ styles using details/summary */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-normal);
  background-color: var(--bg-card);
}

.faq-item[open] {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.faq-item summary {
  padding: 1.2rem;
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-heading);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  outline: none;
  color: var(--text-main);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--color-primary);
  font-weight: 700;
  transition: transform var(--transition-normal);
}

.faq-item[open] summary::after {
  content: '−';
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 1.2rem 1.2rem 1.2rem;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--text-muted);
  border-top: 1px dashed var(--border-color);
  padding-top: 1rem;
}

/* ==========================================================================
   Google AdSense Placeholders (Fase 3)
   ========================================================================== */
.ads-placeholder {
  background-color: var(--ad-bg);
  border: 1px dashed var(--ad-border);
  border-radius: var(--radius-md);
  padding: 1rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--ad-text);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.ads-placeholder::before {
  content: 'PUBLICIDAD ADSENSE';
  margin-bottom: 0.25rem;
  color: var(--color-primary);
  opacity: 0.5;
}

.ads-top {
  width: 100%;
  height: 90px;
  margin-bottom: 2rem;
}

.ads-sidebar {
  width: 100%;
  height: 250px;
}

.ads-bottom {
  width: 100%;
  height: 90px;
  margin-top: 3rem;
}

@media (max-width: 768px) {
  .ads-top, .ads-bottom {
    height: 100px;
  }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-card);
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
  transition: background-color var(--transition-normal);
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-primary);
}

/* Print Styles for Prestaciones page */
@media print {
  body {
    background: white !important;
    color: black !important;
  }
  .site-header, .site-footer, .ads-placeholder, .calculator-main, .seo-section, .btn-primary {
    display: none !important;
  }
  .calculator-container {
    display: block !important;
  }
  .calculator-sidebar {
    position: relative !important;
    top: 0 !important;
    width: 100% !important;
    box-shadow: none !important;
    border: none !important;
    padding: 0 !important;
  }
  .results-card {
    border: none !important;
    box-shadow: none !important;
    background: none !important;
    padding: 0 !important;
  }
  .table-container {
    box-shadow: none !important;
    border: 1px solid #000 !important;
  }
  .data-table th, .data-table td {
    border-bottom: 1px solid #000 !important;
    color: black !important;
    background: white !important;
  }
}

/* Unique ID accessibility helper */
:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}