:root {
    --navy: #1e2a4a;
    --navy-dark: #131c33;
    --navy-light: #2d3d68;
    --accent: #3b82f6;
    --bg: #f7f9fc;
    --bg-soft: #eef2f9;
    --white: #ffffff;
    --text: #1e2a4a;
    --text-soft: #5a6685;
    --border: #e2e8f0;
    --shadow-sm: 0 2px 8px rgba(30, 42, 74, 0.06);
    --shadow-md: 0 8px 24px rgba(30, 42, 74, 0.08);
    --shadow-lg: 0 20px 50px rgba(30, 42, 74, 0.12);

    --correct: #22c55e;
    --correct-bg: #f0fdf4;
    --correct-border: #86efac;

    --wrong: #ef4444;
    --wrong-bg: #fef2f2;
    --wrong-border: #fca5a5;
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }
  html { scroll-behavior: smooth; }

  body {
    font-family: 'Plus Jakarta Sans', -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
  }

  .btn {
    padding: 12px 24px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 15px;
    text-decoration: none;
    transition: all 0.25s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: none;
    cursor: pointer;
    font-family: inherit;
  }

  .btn-primary {
    background: var(--navy);
    color: white;
    box-shadow: var(--shadow-sm);
  }

  .btn-primary:hover {
    background: var(--navy-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
  }

  .btn-primary:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
  }

  .btn-secondary {
    background: white;
    color: var(--navy);
    border: 1.5px solid var(--border);
  }

  .btn-secondary:hover {
    border-color: var(--navy);
    transform: translateY(-1px);
  }

  .btn-large {
    padding: 15px 30px;
    font-size: 16px;
  }

  /* ===== HERO ===== */
  .demo-hero {
    padding: 70px 0 50px;
    background: linear-gradient(165deg, var(--bg-soft) 0%, var(--bg) 100%);
    border-bottom: 1px solid var(--border);
    position: relative;
    overflow: hidden;
  }

  .demo-hero::before {
    content: '';
    position: absolute;
    top: -150px;
    right: -150px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.08) 0%, transparent 70%);
    border-radius: 50%;
  }

  .hero-content {
    max-width: 780px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
  }

  .hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, #dcfce7 0%, #f0fdf4 100%);
    border: 1px solid #86efac;
    padding: 8px 18px;
    border-radius: 100px;
    font-size: 13px;
    font-weight: 700;
    color: #166534;
    margin-bottom: 22px;
    box-shadow: var(--shadow-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
  }

  .hero-badge svg { color: #22c55e; }

  .demo-hero h1 {
    font-size: clamp(36px, 5.5vw, 58px);
    font-weight: 800;
    color: var(--navy);
    letter-spacing: -1.8px;
    line-height: 1.05;
    margin-bottom: 22px;
  }

  .demo-hero h1 .highlight {
    background: linear-gradient(120deg, var(--accent) 0%, var(--navy-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  .demo-hero p {
    font-size: 18px;
    color: var(--text-soft);
    margin-bottom: 36px;
    max-width: 620px;
    margin-left: auto;
    margin-right: auto;
  }

  .hero-stats {
    display: flex;
    gap: 30px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 8px;
  }

  .hero-stat {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-soft);
    font-size: 14px;
    font-weight: 600;
  }

  .hero-stat svg { color: var(--accent); }

  .hero-stat strong { color: var(--navy); font-weight: 800; }

  /* ===== DEMO TEST ===== */
  .demo-section {
    padding: 60px 0 80px;
  }

  .demo-wrapper {
    max-width: 720px;
    margin: 0 auto;
  }

  .demo-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 36px;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
  }

  .demo-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--accent), var(--navy-light));
  }

  /* Header del test */
  .demo-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 22px;
    padding-bottom: 22px;
    border-bottom: 1px solid var(--border);
    gap: 16px;
    flex-wrap: wrap;
  }

  .demo-header-info {
    display: flex;
    align-items: center;
    gap: 14px;
  }

  .demo-header-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--navy), var(--navy-light));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
  }

  .demo-header-text strong {
    display: block;
    font-size: 16px;
    color: var(--navy);
    font-weight: 800;
    letter-spacing: -0.2px;
  }

  .demo-header-text span {
    font-size: 13px;
    color: var(--text-soft);
  }

  .demo-counter {
    background: var(--bg-soft);
    color: var(--navy);
    padding: 7px 14px;
    border-radius: 100px;
    font-size: 13px;
    font-weight: 700;
  }

  /* Barra de progreso */
  .demo-progress {
    margin-bottom: 28px;
  }

  .demo-progress-label {
    display: flex;
    justify-content: space-between;
    font-size: 12.5px;
    color: var(--text-soft);
    margin-bottom: 8px;
    font-weight: 600;
  }

  .demo-progress-bar {
    height: 8px;
    background: var(--bg-soft);
    border-radius: 100px;
    overflow: hidden;
  }

  .demo-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--navy-light));
    border-radius: 100px;
    width: 20%;
    transition: width 0.5s ease;
  }

  /* Pregunta */
  .demo-question {
    font-size: 19px;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 22px;
    line-height: 1.4;
    letter-spacing: -0.3px;
  }

  /* Opciones */
  .demo-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
  }

  .demo-option {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: 14px;
    font-size: 15px;
    color: var(--text);
    transition: all 0.2s;
    cursor: pointer;
    font-weight: 500;
    text-align: left;
    width: 100%;
    font-family: inherit;
  }

  .demo-option:hover:not(:disabled) {
    border-color: var(--accent);
    background: white;
    transform: translateX(3px);
  }

  .demo-option:disabled {
    cursor: default;
  }

  .demo-option-letter {
    width: 32px;
    height: 32px;
    background: white;
    border: 2px solid var(--border);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 14px;
    color: var(--text-soft);
    flex-shrink: 0;
    transition: all 0.2s;
  }

  .demo-option:hover:not(:disabled) .demo-option-letter {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
  }

  .demo-option.correct {
    background: var(--correct-bg);
    border-color: var(--correct);
    color: #166534;
  }

  .demo-option.correct .demo-option-letter {
    background: var(--correct);
    border-color: var(--correct);
    color: white;
  }

  .demo-option.wrong {
    background: var(--wrong-bg);
    border-color: var(--wrong);
    color: #991b1b;
  }

  .demo-option.wrong .demo-option-letter {
    background: var(--wrong);
    border-color: var(--wrong);
    color: white;
  }

  .demo-option.faded {
    opacity: 0.5;
  }

  .demo-option-icon {
    margin-left: auto;
    flex-shrink: 0;
    opacity: 0;
    transform: scale(0.5);
    transition: all 0.3s;
  }

  .demo-option.correct .demo-option-icon,
  .demo-option.wrong .demo-option-icon {
    opacity: 1;
    transform: scale(1);
  }

  /* Explicación */
  .demo-explanation {
    background: linear-gradient(165deg, #eef2f9 0%, #f7f9fc 100%);
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
    border-radius: 12px;
    padding: 18px 22px;
    margin-bottom: 22px;
    display: none;
  }

  .demo-explanation.visible {
    display: block;
    animation: slideDown 0.4s ease;
  }

  @keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .demo-explanation-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--accent);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
  }

  .demo-explanation-text {
    font-size: 14.5px;
    color: var(--text);
    line-height: 1.6;
  }

  .demo-explanation-text strong { color: var(--navy); }

  /* Footer del test */
  .demo-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
  }

  .demo-score {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-soft);
    font-weight: 600;
  }

  .demo-score strong { color: var(--navy); }

  /* ===== PANTALLA DE RESULTADOS ===== */
  .demo-results {
    display: none;
    text-align: center;
    padding: 12px 0;
  }

  .demo-results.visible {
    display: block;
    animation: fadeIn 0.5s ease;
  }

  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .results-emoji {
    font-size: 56px;
    margin-bottom: 14px;
    line-height: 1;
  }

  .results-title {
    font-size: 26px;
    font-weight: 800;
    color: var(--navy);
    letter-spacing: -0.6px;
    margin-bottom: 10px;
  }

  .results-subtitle {
    font-size: 15.5px;
    color: var(--text-soft);
    margin-bottom: 30px;
    max-width: 460px;
    margin-left: auto;
    margin-right: auto;
  }

  .results-score-circle {
    width: 160px;
    height: 160px;
    margin: 0 auto 30px;
    position: relative;
  }

  .results-score-circle svg {
    transform: rotate(-90deg);
  }

  .results-score-bg {
    fill: none;
    stroke: var(--bg-soft);
    stroke-width: 10;
  }

  .results-score-fill {
    fill: none;
    stroke: url(#gradient);
    stroke-width: 10;
    stroke-linecap: round;
    transition: stroke-dashoffset 1.5s ease;
  }

  .results-score-text {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }

  .results-score-text strong {
    font-size: 38px;
    font-weight: 800;
    color: var(--navy);
    letter-spacing: -1px;
    line-height: 1;
  }

  .results-score-text span {
    font-size: 12.5px;
    color: var(--text-soft);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 4px;
  }

  .results-breakdown {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-bottom: 30px;
    max-width: 380px;
    margin-left: auto;
    margin-right: auto;
  }

  .breakdown-item {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px 12px;
  }

  .breakdown-item strong {
    display: block;
    font-size: 22px;
    color: var(--navy);
    font-weight: 800;
    letter-spacing: -0.5px;
    line-height: 1;
    margin-bottom: 4px;
  }

  .breakdown-item.correct strong { color: var(--correct); }
  .breakdown-item.wrong strong { color: var(--wrong); }

  .breakdown-item span {
    font-size: 12px;
    color: var(--text-soft);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.4px;
  }

  .results-cta {
    background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
    color: white;
    border-radius: 18px;
    padding: 28px 30px;
    text-align: left;
    position: relative;
    overflow: hidden;
  }

  .results-cta::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 250px;
    height: 250px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.3) 0%, transparent 70%);
    border-radius: 50%;
  }

  .results-cta > * { position: relative; z-index: 1; }

  .results-cta h4 {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 8px;
    letter-spacing: -0.4px;
    line-height: 1.3;
  }

  .results-cta p {
    font-size: 14.5px;
    opacity: 0.9;
    margin-bottom: 20px;
    line-height: 1.55;
  }

  .results-cta-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
  }

  .results-cta .btn-white {
    background: white;
    color: var(--navy);
  }

  .results-cta .btn-ghost {
    background: rgba(255,255,255,0.1);
    color: white;
    border: 1.5px solid rgba(255,255,255,0.3);
  }

  .results-cta .btn-ghost:hover {
    background: rgba(255,255,255,0.2);
  }

  /* ===== SECCIONES ===== */
  section { padding: 80px 0; }

  .section-header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto 50px;
  }

  .section-tag {
    display: inline-block;
    background: var(--bg-soft);
    color: var(--navy);
    padding: 6px 14px;
    border-radius: 100px;
    font-size: 12.5px;
    font-weight: 700;
    margin-bottom: 14px;
    letter-spacing: 0.4px;
    text-transform: uppercase;
  }

  .section-header h2 {
    font-size: clamp(28px, 4vw, 38px);
    font-weight: 800;
    color: var(--navy);
    letter-spacing: -1px;
    line-height: 1.15;
    margin-bottom: 14px;
  }

  .section-header p {
    font-size: 16.5px;
    color: var(--text-soft);
  }

  /* ===== BENEFICIOS ===== */
  .benefits {
    background: white;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }

  .benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 22px;
  }

  .benefit-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 30px 26px;
    transition: all 0.3s ease;
  }

  .benefit-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
    background: white;
  }

  .benefit-icon {
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, var(--navy), var(--navy-light));
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    margin-bottom: 18px;
    transition: transform 0.3s;
  }

  .benefit-card:hover .benefit-icon {
    transform: scale(1.05) rotate(-3deg);
  }

  .benefit-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 8px;
    letter-spacing: -0.2px;
  }

  .benefit-card p {
    font-size: 14px;
    color: var(--text-soft);
    line-height: 1.55;
  }

  /* ===== MÁS TESTS ===== */
  .more-tests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
  }

  .test-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 28px 26px;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
  }

  .test-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), var(--navy-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
  }

  .test-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--navy-light);
  }

  .test-card:hover::before { transform: scaleX(1); }

  .test-card-icon {
    width: 48px;
    height: 48px;
    background: var(--bg-soft);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    margin-bottom: 16px;
  }

  .test-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 6px;
    letter-spacing: -0.2px;
  }

  .test-card-cat {
    font-size: 11.5px;
    color: var(--accent);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
  }

  .test-card p {
    font-size: 13.5px;
    color: var(--text-soft);
    line-height: 1.55;
    margin-bottom: 18px;
    flex: 1;
  }

  .test-card-meta {
    display: flex;
    gap: 16px;
    padding-top: 14px;
    border-top: 1px solid var(--border);
    margin-bottom: 18px;
  }

  .test-card-meta-item {
    font-size: 12px;
    color: var(--text-soft);
    display: flex;
    align-items: center;
    gap: 5px;
  }

  .test-card-meta-item svg { color: var(--accent); }

  .test-card-meta-item strong { color: var(--navy); font-weight: 700; }

  .test-card .btn {
    width: 100%;
    justify-content: center;
  }

  /* ===== CÓMO FUNCIONA ===== */
  .how-it-works { background: var(--bg-soft); }

  .steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
  }

  .step-card {
    text-align: center;
    padding: 20px;
    position: relative;
  }

  .step-num {
    width: 56px;
    height: 56px;
    background: white;
    border: 2px solid var(--border);
    border-radius: 50%;
    margin: 0 auto 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 22px;
    color: var(--navy);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s;
  }

  .step-card:hover .step-num {
    transform: translateY(-3px) scale(1.05);
    background: var(--navy);
    color: white;
    border-color: var(--navy);
  }

  .step-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 10px;
    letter-spacing: -0.2px;
  }

  .step-card p {
    font-size: 14.5px;
    color: var(--text-soft);
    line-height: 1.55;
  }

  /* ===== FAQ ===== */
  .faq-wrapper {
    max-width: 760px;
    margin: 0 auto;
    display: grid;
    gap: 12px;
  }

  .faq-item {
    background: white;
    border: 1px solid var(--border);
    border-radius: 14px;
    overflow: hidden;
    transition: all 0.2s;
  }

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

  .faq-item summary {
    padding: 20px 26px;
    font-size: 15.5px;
    font-weight: 700;
    color: var(--navy);
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 14px;
  }

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

  .faq-item summary::after {
    content: '';
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='22' height='22' viewBox='0 0 24 24' fill='none' stroke='%231e2a4a' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    transition: transform 0.25s;
  }

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

  .faq-item .faq-body {
    padding: 0 26px 22px;
    font-size: 14.5px;
    color: var(--text);
    line-height: 1.65;
  }

  /* ===== CTA FINAL ===== */
  .cta-final-section { padding: 90px 0 100px; }

  .cta-box {
    background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
    border-radius: 28px;
    padding: 70px 40px;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
  }

  .cta-box::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.3) 0%, transparent 70%);
    border-radius: 50%;
  }

  .cta-box > * { position: relative; z-index: 1; }

  .cta-box h2 {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -1px;
    line-height: 1.2;
  }

  .cta-box p {
    font-size: 17px;
    opacity: 0.9;
    margin-bottom: 32px;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
  }

  .cta-buttons {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
  }

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

  .btn-white:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  }

  .btn-ghost-white {
    background: transparent;
    color: white;
    border: 1.5px solid rgba(255,255,255,0.3);
  }

  .btn-ghost-white:hover {
    background: rgba(255,255,255,0.1);
    border-color: white;
  }

  /* ===== ANIMACIONES ===== */
  .fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }

  .fade-in.visible {
    opacity: 1;
    transform: translateY(0);
  }

  /* ===== RESPONSIVE ===== */
  @media (max-width: 700px) {
    .demo-card { padding: 26px 22px; }
    .demo-question { font-size: 17px; }
    .demo-option { padding: 14px 16px; font-size: 14px; gap: 12px; }
    .demo-option-letter { width: 28px; height: 28px; font-size: 13px; }
    section { padding: 60px 0; }
    .cta-box { padding: 50px 24px; }
    .results-cta { padding: 24px 22px; }
    .results-score-circle { width: 140px; height: 140px; }
  }

  @media (max-width: 400px) {
    .demo-header { flex-direction: column; align-items: flex-start; }
    .demo-counter { align-self: flex-start; }
    .results-breakdown { grid-template-columns: 1fr; }
  }