:root {
    --bg: #f9fafb;
    --card: #ffffff;
    --text: #111827;
    --muted: #6b7280;
    --primary: #2563eb;
    --accent: #7c3aed;
    --radius: 16px;
    --maxw: 1080px;
  }

  body {
    margin: 0;
    font-family: Inter, sans-serif;
    color: var(--text);
    background: var(--bg);
    scroll-behavior: smooth;
  }

  section {
    padding: clamp(48px, 5vw, 96px) 5vw;
    position: relative;
  }

  h1,
  h2,
  h3 {
    font-family: Poppins, sans-serif;
  }

  h1 {
    font-size: clamp(32px, 6vw, 54px);
    margin: 0 0 12px;
    text-align: center;
  }

  h2 {
    font-size: clamp(22px, 3.5vw, 32px);
    margin: 24px 0 8px;
    text-align: center;
  }

  h3 {
    font-size: 20px;
    margin: 0;
  }

  .container_section {
    max-width: var(--maxw);
    margin: auto;
  }

  .header {
    background: url('portfolio.jpg') center center / cover no-repeat fixed;
    color: white;
    text-align: center;
    padding: 96px 24px;
    position: relative;
  }

  .overlay {
    background: rgba(0, 0, 0, 0.45);
    position: absolute;
    inset: 0;
  }

  .overlay-content {
    position: relative;
    z-index: 1;
  }

  .subtitulo {
    max-width: 1050px;
    margin: 0 auto;
    text-align: center;
    font-size: clamp(18px, 2.2vw, 22px);
    line-height: 1.6;
  }

  .accordion {
    background: #e5e7eb;
    border-radius: 12px;
    margin: 24px 0;
    padding: 16px;
    cursor: pointer;
    transition: background 0.2s ease;
  }

  .accordion:hover {
    background: #d1d5db;
  }

  .panel {
    display: none;
    margin-top: 16px;
    animation: fade 0.3s ease-in-out;
  }

  .panel .grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    margin-top: 16px;
  }

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

  .card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, .1);
    transition: transform 0.2s ease;
  }

  .card:hover {
    transform: translateY(-6px);
  }

  .btns {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 18px;
    justify-content: center;
  }

  .btn {
    padding: 12px 18px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    transition: 0.2s;
  }

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

  .btn.ghost {
    background: #e5e7eb;
    color: #111827;
  }

  .btn:hover {
    opacity: .85;
  }

  .btn i {
    margin-right: 8px;
  }

  .btns {
    justify-content: center;
  }

  /* Botonera del héroe */
  #inicio .btns {
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
  }

  #inicio .btn {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(6px);
  }

  #inicio .btn:hover {
    background: rgba(255, 255, 255, 0.3);
    color: #111;
  }

  /* efecto suavizado */
  #inicio .btns {
    animation: fadeUp 1s ease forwards;
    opacity: 0;
  }


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

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

  footer {
    text-align: center;
    padding: 32px;
    color: var(--muted);
  }

  .accordion i {
    float: right;
    transition: transform 0.3s;
  }

  .accordion.active i {
    transform: rotate(90deg);
  }

  .card.visible {
    opacity: 1;
    transform: translateY(0);
  }

  /* Switch Dark Mode */
  .theme-toggle {
    position: fixed;
    top: 14px;
    left: 14px;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(8px);
    border-radius: 999px;
    padding: 6px 10px;
    border: 1px solid #e5e7eb;
  }

  .theme-toggle button {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 18px;
    color: #111827;
  }

  body.dark .theme-toggle {
    background: rgba(30, 41, 59, 0.8);
    border-color: #334155;
  }

  body.dark .theme-toggle button {
    color: #f1f5f9;
  }

  /* Web Dark */
  body.dark {
    background-color: #0f172a;
    color: #f1f5f9;
    transition: background-color 0.3s ease, color 0.3s ease;
  }

  body.dark .card {
    background: #1e293b;
    color: #f1f5f9;
    border: 1px solid #334155;
  }

  body.dark h2,
  body.dark h4 {
    color: #1e293b;
  }

  body.dark h3 {
    color: #f1f5f9;
  }


  body.dark .btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: #f1f5f9;
  }

  body.dark .btn:hover {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
  }


  body.dark input,
  body.dark textarea {
    background: #1e293b;
    border: 1px solid #475569;
    color: #f1f5f9;
  }

  /* Toggle ES/EN */
  .lang-switch {
    position: fixed;
    top: 14px;
    right: 14px;
    background: rgba(255, 255, 255, .8);
    backdrop-filter: blur(8px);
    border: 1px solid #e5e7eb;
    border-radius: 999px;
    padding: 6px 10px;
    display: flex;
    gap: 10px;
    align-items: center;
    z-index: 1000;
  }

  .lang-switch button {
    background: none;
    border: none;
    font-weight: 700;
    cursor: pointer;
    padding: 6px 10px;
    border-radius: 999px;
  }

  .lang-switch button.active {
    background: var(--primary);
    color: white;
  }

  /* Contact form */
  .container {
    width: 100%;
    max-width: var(--maxw);
    margin: auto;
  }

  #contact-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 500px;
    margin: 0 auto;
  }

  #contact-form input,
  #contact-form textarea {
    width: 100%;
    padding: 14px 5px;
    border: 1px solid #d1d5db;
    border-radius: 10px;
    font-size: 1rem;
    outline: none;
    transition: all 0.2s ease;
  }

  #contact-form input:focus,
  #contact-form textarea:focus {
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
  }

  #contact-form button {
    background: #2563eb;
    color: #fff;
    padding: 14px;
    border: none;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease;
  }

  #contact-form button:hover {
    background: #1e40af;
  }

  .dots {
    position: fixed;
    right: 18px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 999;
  }

  .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #9ca3af;
    display: block;
  }

  .dot.active {
    background: var(--primary);
    transform: scale(1.2);
  }