/* ============================================================
   VARIABLES & RESET
   ============================================================ */
:root {
  --blue-900: #1e3a5f;
  --blue-700: #1a56db;
  --blue-600: #1c64f2;
  --blue-500: #3f83f8;
  --blue-100: #e1effe;
  --blue-50:  #eff6ff;

  --gray-900: #111827;
  --gray-700: #374151;
  --gray-500: #6b7280;
  --gray-300: #d1d5db;
  --gray-200: #e5e7eb;
  --gray-100: #f3f4f6;
  --gray-50:  #f9fafb;

  --white: #ffffff;

  --red-600:    #dc2626;
  --red-100:    #fee2e2;
  --red-50:     #fef2f2;
  --orange-600: #d97706;
  --orange-100: #fef3c7;
  --orange-50:  #fffbeb;
  --green-600:  #059669;
  --green-100:  #d1fae5;
  --green-50:   #ecfdf5;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.08), 0 2px 4px -2px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.08), 0 4px 6px -4px rgba(0,0,0,.06);

  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--gray-700);
  background: var(--gray-50);
}

img, svg { display: block; max-width: 100%; }

a { color: var(--blue-600); text-decoration: none; }
a:hover { text-decoration: underline; }

ul, ol { padding-left: 1.25rem; }

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1rem;
}

@media (min-width: 480px)  { .container { padding: 0 1.5rem; } }
@media (min-width: 768px)  { .container { padding: 0 2rem; } }
@media (min-width: 1024px) { .container { padding: 0 2.5rem; } }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 60px;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: .6rem;
}

.header-icon { font-size: 1.5rem; }

.header-title {
  display: block;
  font-size: .95rem;
  font-weight: 700;
  color: var(--blue-900);
  line-height: 1.2;
}

.header-tagline {
  display: none;
  font-size: .72rem;
  color: var(--gray-500);
  line-height: 1;
}

@media (min-width: 480px) { .header-tagline { display: block; } }

.header-nav {
  display: flex;
  gap: 1.25rem;
}

.header-nav a {
  font-size: .875rem;
  font-weight: 500;
  color: var(--gray-700);
  white-space: nowrap;
  padding: .25rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color .2s, color .2s;
}

.header-nav a:hover {
  color: var(--blue-600);
  border-bottom-color: var(--blue-600);
  text-decoration: none;
}

/* ============================================================
   AD SLOTS
   ============================================================ */
.ad-slot {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gray-100);
  border-top: 1px solid var(--gray-200);
  border-bottom: 1px solid var(--gray-200);
  min-height: 90px;
  padding: .5rem 1rem;
  text-align: center;
}

.ad-slot--mid {
  max-width: 760px;
  margin: 0 auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-200);
  margin-bottom: 1.5rem;
}

.ad-slot--after-results {
  margin: 2rem 0;
}

.ad-label {
  font-size: .7rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: .08em;
  font-weight: 500;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  background: linear-gradient(135deg, var(--blue-900) 0%, var(--blue-700) 100%);
  color: var(--white);
  padding: 3rem 0 2.5rem;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .06em;
  padding: .3rem .9rem;
  margin-bottom: 1.25rem;
  color: rgba(255,255,255,.95);
  text-transform: uppercase;
}

.hero h1 {
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 1rem;
  color: var(--white);
}

@media (min-width: 480px) { .hero h1 { font-size: 2.1rem; } }
@media (min-width: 768px) { .hero h1 { font-size: 2.6rem; } }

.hero-subtitle {
  font-size: 1rem;
  line-height: 1.6;
  color: rgba(255,255,255,.88);
  max-width: 620px;
  margin: 0 auto 1.5rem;
}

@media (min-width: 768px) { .hero-subtitle { font-size: 1.1rem; } }

.hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  justify-content: center;
}

.trust-badge {
  background: rgba(255,255,255,.1);
  border-radius: var(--radius-sm);
  font-size: .8rem;
  font-weight: 500;
  padding: .3rem .75rem;
  color: rgba(255,255,255,.9);
}

/* ============================================================
   CALCULATOR SECTION
   ============================================================ */
.calculator-section {
  padding: 2rem 0 3rem;
}

.calc-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 1.5rem;
  border: 1px solid var(--gray-200);
  margin-bottom: 2rem;
}

@media (min-width: 768px) { .calc-card { padding: 2.5rem; } }

.calc-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--blue-900);
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-bottom: .5rem;
}

.calc-card__icon { font-size: 1.3rem; }

.calc-card__subtitle {
  font-size: .85rem;
  color: var(--gray-500);
  margin-bottom: 1.75rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--gray-200);
}

/* Fieldset & legend */
.form-fieldset {
  border: none;
  margin-bottom: 1.75rem;
  padding: 0;
}

.form-legend {
  font-size: .95rem;
  font-weight: 700;
  color: var(--blue-700);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: .5rem;
}

.form-legend::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 1em;
  background: var(--blue-600);
  border-radius: 2px;
}

.form-row {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) { .form-row { grid-template-columns: 1fr 1fr; } }

.form-group { display: flex; flex-direction: column; gap: .35rem; }

.form-label {
  font-size: .875rem;
  font-weight: 600;
  color: var(--gray-700);
}

.required { color: var(--red-600); }

.form-input {
  width: 100%;
  padding: .65rem .9rem;
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius-sm);
  font-size: .95rem;
  font-family: var(--font);
  color: var(--gray-900);
  background: var(--white);
  transition: border-color .2s, box-shadow .2s;
  appearance: none;
  -webkit-appearance: none;
}

.form-input:focus {
  outline: none;
  border-color: var(--blue-500);
  box-shadow: 0 0 0 3px rgba(63,131,248,.15);
}

.form-input.is-invalid {
  border-color: var(--red-600);
  box-shadow: 0 0 0 3px rgba(220,38,38,.1);
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right .75rem center;
  padding-right: 2.5rem;
  cursor: pointer;
}

.form-hint {
  font-size: .78rem;
  color: var(--gray-500);
  line-height: 1.4;
}

.input-wrapper { position: relative; }

.input-suffix {
  position: absolute;
  right: .85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-500);
  font-weight: 500;
  pointer-events: none;
}

/* Radio group */
.radio-group {
  display: flex;
  flex-direction: column;
  gap: .6rem;
}

.radio-label {
  display: flex;
  align-items: flex-start;
  gap: .6rem;
  cursor: pointer;
  font-size: .9rem;
  line-height: 1.5;
  padding: .6rem .75rem;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  transition: border-color .2s, background .2s;
}

.radio-label:hover { border-color: var(--blue-400, #60a5fa); background: var(--blue-50); }

.radio-label input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.radio-custom {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  border: 2px solid var(--gray-300);
  border-radius: 50%;
  margin-top: .15rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color .2s, background .2s;
}

.radio-label input[type="radio"]:checked ~ .radio-custom {
  border-color: var(--blue-600);
  background: var(--blue-600);
  box-shadow: inset 0 0 0 3px var(--white);
}

.radio-label:has(input[type="radio"]:checked) {
  border-color: var(--blue-500);
  background: var(--blue-50);
}

/* Form actions */
.form-actions { margin-top: 2rem; }

.btn-calculate {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  width: 100%;
  padding: .9rem 2rem;
  background: var(--blue-600);
  color: var(--white);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background .2s, transform .1s, box-shadow .2s;
  box-shadow: 0 4px 14px rgba(28,100,242,.35);
  letter-spacing: .02em;
}

.btn-calculate:hover {
  background: var(--blue-700);
  box-shadow: 0 6px 20px rgba(28,100,242,.4);
}

.btn-calculate:active { transform: scale(.98); }

.btn-icon { font-size: 1.1rem; }

.form-error {
  margin-top: 1rem;
  padding: .75rem 1rem;
  background: var(--red-50);
  border: 1px solid var(--red-100);
  border-radius: var(--radius-sm);
  color: var(--red-600);
  font-size: .875rem;
  font-weight: 500;
}

/* ============================================================
   RESULTS
   ============================================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.results-section {
  animation: fadeInUp .4s ease-out;
}

.results-header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.results-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--blue-900);
  margin-bottom: .5rem;
}

.results-summary {
  color: var(--gray-500);
  font-size: .9rem;
}

/* Diagnosis card */
.diagnosis-card {
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border-width: 1px;
  border-style: solid;
}

.diagnosis-card.nulo {
  background: var(--red-50);
  border-color: #fca5a5;
}

.diagnosis-card.nulo-alto {
  background: var(--orange-50);
  border-color: #fcd34d;
}

.diagnosis-card.incierto {
  background: var(--blue-50);
  border-color: var(--blue-100);
}

.diagnosis-title {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: .75rem;
}

.diagnosis-card.nulo      .diagnosis-title { color: var(--red-600); }
.diagnosis-card.nulo-alto .diagnosis-title { color: var(--orange-600); }
.diagnosis-card.incierto  .diagnosis-title { color: var(--blue-700); }

.diagnosis-body { font-size: .9rem; line-height: 1.65; }
.diagnosis-body p { margin-bottom: .6rem; }
.diagnosis-body p:last-child { margin-bottom: 0; }
.diagnosis-body strong { font-weight: 700; }

/* Scenarios grid */
.scenarios-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
  margin-bottom: 1.25rem;
}

@media (min-width: 640px) { .scenarios-grid { grid-template-columns: 1fr 1fr; } }

.scenario-card {
  background: var(--white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--gray-200);
  overflow: hidden;
}

.scenario-header {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--gray-100);
}

.scenario-card--improcedente .scenario-header { background: var(--blue-50); }
.scenario-card--procedente  .scenario-header { background: var(--green-50); }

.scenario-icon { font-size: 1.4rem; }

.scenario-title {
  font-size: .95rem;
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1.3;
}

.scenario-tag {
  display: block;
  font-size: .73rem;
  color: var(--gray-500);
  font-weight: 500;
  margin-top: .15rem;
}

.scenario-body {
  padding: 1.25rem;
  font-size: .875rem;
}

.calc-line {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: .4rem 0;
  border-bottom: 1px solid var(--gray-100);
  gap: .5rem;
}

.calc-line:last-child { border-bottom: none; }

.calc-label {
  color: var(--gray-500);
  font-size: .8rem;
  flex: 1;
  min-width: 0;
}

.calc-value {
  font-weight: 600;
  color: var(--gray-900);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  font-size: .88rem;
}

.calc-total {
  border-top: 2px solid var(--gray-200);
  margin-top: .5rem;
  padding-top: .6rem;
}

.calc-total .calc-label { font-weight: 700; color: var(--gray-700); font-size: .875rem; }
.calc-card--improcedente .calc-total .calc-value,
.scenario-card--improcedente .calc-total .calc-value { color: var(--blue-600); font-size: 1.05rem; }
.scenario-card--procedente .calc-total .calc-value { color: var(--green-600); font-size: 1.05rem; }

.calc-cap-note {
  margin-top: .6rem;
  font-size: .75rem;
  color: var(--orange-600);
  background: var(--orange-50);
  border-radius: var(--radius-sm);
  padding: .4rem .6rem;
  font-weight: 500;
}

.calc-mixed-note {
  margin-bottom: .75rem;
  font-size: .78rem;
  color: var(--blue-700);
  background: var(--blue-50);
  border-radius: var(--radius-sm);
  padding: .5rem .7rem;
  border-left: 3px solid var(--blue-500);
}

/* Disclaimer */
.legal-disclaimer {
  display: flex;
  gap: .75rem;
  align-items: flex-start;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
  font-size: .8rem;
  color: var(--gray-500);
  line-height: 1.5;
}

.disclaimer-icon { font-size: 1.1rem; flex-shrink: 0; margin-top: .05rem; }

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

.btn-reset {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .6rem 1.5rem;
  background: var(--white);
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius-md);
  font-size: .875rem;
  font-weight: 600;
  color: var(--gray-700);
  cursor: pointer;
  transition: border-color .2s, background .2s;
}

.btn-reset:hover { border-color: var(--blue-500); background: var(--blue-50); color: var(--blue-700); }

/* ============================================================
   FAQ SECTION
   ============================================================ */
.faq-section {
  background: var(--white);
  padding: 3.5rem 0;
  border-top: 1px solid var(--gray-200);
}

.faq-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.faq-header h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--blue-900);
  margin-bottom: .6rem;
}

@media (min-width: 768px) { .faq-header h2 { font-size: 1.9rem; } }

.faq-header p {
  color: var(--gray-500);
  max-width: 560px;
  margin: 0 auto;
}

.faq-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}

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

.faq-card {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.faq-question {
  font-size: 1rem;
  font-weight: 700;
  color: var(--blue-900);
  margin-bottom: .9rem;
  line-height: 1.4;
}

.faq-answer {
  font-size: .875rem;
  color: var(--gray-700);
  line-height: 1.7;
}

.faq-answer p { margin-bottom: .75rem; }
.faq-answer p:last-child { margin-bottom: 0; }

.faq-answer h3 {
  font-size: .925rem;
  font-weight: 700;
  color: var(--blue-700);
  margin: 1rem 0 .5rem;
}

.faq-list { margin: .5rem 0 .75rem; }
.faq-list li { margin-bottom: .4rem; }

.faq-alert {
  background: var(--orange-50);
  border: 1px solid var(--orange-100);
  border-radius: var(--radius-sm);
  padding: .65rem .9rem;
  font-size: .82rem;
  color: var(--gray-700);
  margin-top: .75rem;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--blue-900);
  color: rgba(255,255,255,.75);
  padding: 2.5rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1fr;
  margin-bottom: 2rem;
}

@media (min-width: 640px)  { .footer-grid { grid-template-columns: 2fr 1fr 1fr; } }

.footer-logo {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: .75rem;
}

.footer-brand p { font-size: .83rem; line-height: 1.6; }

.footer-links h3,
.footer-legal h3 {
  font-size: .83rem;
  font-weight: 700;
  color: var(--white);
  text-transform: uppercase;
  letter-spacing: .07em;
  margin-bottom: .75rem;
}

.footer-links ul,
.footer-legal ul { list-style: none; padding: 0; }

.footer-links li,
.footer-legal li {
  font-size: .82rem;
  margin-bottom: .4rem;
}

.footer-links a { color: rgba(255,255,255,.75); }
.footer-links a:hover { color: var(--white); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12);
  padding-top: 1.25rem;
  text-align: center;
  font-size: .77rem;
  color: rgba(255,255,255,.5);
}

/* ============================================================
   UTILITY
   ============================================================ */
[hidden] { display: none !important; }