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

    html, body {
      height: 100%;
    }

    body {
      display: flex;
      flex-direction: column;
      font-family: 'Inter', sans-serif;
      background-color: #03060c;
      color: #f0f3f8;
      line-height: 1.5;
      min-height: 100vh;  /* fallback */
      position: relative;
    }

    :root {
      --cyan-glow: #2ad4ff;
      --cyan-dark: #00a3cc;
      --red-accent: #ff3366;
      --glass-bg: rgba(10, 18, 28, 0.55);
      --glass-border: rgba(42, 212, 255, 0.25);
      --card-radius: 2rem;
      --transition-smooth: 0.4s cubic-bezier(0.2, 0.9, 0.4, 1.1);
    }

    .cinematic-bg {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: -2;
      background: url('../images/INICIO.png') no-repeat center center fixed;
      background-size: cover;
      filter: blur(14px) brightness(0.55);
      transform: scale(1.02);
    }
    .dark-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 20% 30%, rgba(0,0,0,0.4) 0%, rgba(0,0,0,0.7) 100%);
      z-index: -1;
    }

    .page-header {
      position: relative;
      padding: 1.8rem 2rem 1rem 2rem;
      backdrop-filter: blur(8px);
      background: rgba(5, 12, 20, 0.4);
      border-bottom: 1px solid var(--glass-border);
      margin-bottom: 1.2rem;
      flex-shrink: 0;  /* evita que se encoja */
    }
    .header-inner {
      max-width: 1280px;
      margin: 0 auto;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1rem;
    }
    .brand {
      display: flex;
      align-items: center;
      gap: 0.6rem;
    }
    .brand-icon {
      font-size: 1.9rem;
      color: var(--cyan-glow);
      filter: drop-shadow(0 0 6px var(--cyan-glow));
    }
    .brand h1 {
      font-family: 'Poppins', sans-serif;
      font-weight: 800;
      font-size: 1.6rem;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #ffffff, var(--cyan-glow));
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }
    .brand span {
      font-size: 0.8rem;
      font-weight: 400;
      color: rgba(255,255,255,0.65);
      letter-spacing: 1px;
    }
    .header-tag {
      background: rgba(42, 212, 255, 0.12);
      backdrop-filter: blur(4px);
      padding: 0.4rem 1.2rem;
      border-radius: 40px;
      border: 1px solid rgba(42,212,255,0.3);
      font-size: 0.8rem;
      font-weight: 500;
    }
    .header-tag i {
      margin-right: 6px;
      color: var(--cyan-glow);
    }

    .main-container {
      flex: 1; 
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 1.8rem 3rem 1.8rem;
      width: 100%;
    }

    /* title section */
    .title-section {
      text-align: center;
      margin: 1.2rem 0 2.8rem 0;
    }
    .title-section h2 {
      font-family: 'Poppins', sans-serif;
      font-size: 3rem;
      font-weight: 800;
      text-transform: uppercase;
      background: linear-gradient(125deg, #ffffff, var(--cyan-glow), #ff99cc);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
      letter-spacing: -0.02em;
      text-shadow: 0 2px 15px rgba(0,247,255,0.2);
    }
    .title-section .glow-line {
      width: 100px;
      height: 3px;
      background: linear-gradient(90deg, transparent, var(--cyan-glow), var(--red-accent), transparent);
      margin: 0.8rem auto 0.6rem;
      border-radius: 4px;
    }
    .title-section p {
      color: rgba(255,255,255,0.7);
      font-size: 1rem;
      letter-spacing: 0.3px;
    }

    .terms-grid-3d {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
      gap: 2rem;
      margin: 2rem 0 3rem 0;
      perspective: 1200px;
    }

    .card-3d {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      padding: 1.8rem 1.5rem;
      transition: transform var(--transition-smooth), box-shadow 0.3s ease, border-color 0.2s;
      transform-style: preserve-3d;
      transform: translateY(20px) rotateX(0deg) rotateY(0deg);
      opacity: 0;
      animation: cardFloatIn 0.7s cubic-bezier(0.23, 1, 0.32, 1) forwards;
      box-shadow: 0 20px 35px -12px rgba(0,0,0,0.5);
      will-change: transform;
      text-align: center;
    }

    .card-3d:hover {
      transform: translateY(-12px) rotateX(3deg) rotateY(3deg) scale(1.02);
      border-color: rgba(42, 212, 255, 0.7);
      box-shadow: 0 30px 45px -15px rgba(0,0,0,0.7), 0 0 0 1px rgba(42,212,255,0.3);
      transition: transform 0.35s ease, box-shadow 0.25s;
    }

    @keyframes cardFloatIn {
      0% {
        opacity: 0;
        transform: translateY(35px) rotateX(2deg);
      }
      100% {
        opacity: 1;
        transform: translateY(0) rotateX(0);
      }
    }

    .card-3d:nth-child(1) { animation-delay: 0.05s; }
    .card-3d:nth-child(2) { animation-delay: 0.1s; }
    .card-3d:nth-child(3) { animation-delay: 0.15s; }
    .card-3d:nth-child(4) { animation-delay: 0.2s; }
    .card-3d:nth-child(5) { animation-delay: 0.25s; }
    .card-3d:nth-child(6) { animation-delay: 0.3s; }
    .card-3d:nth-child(7) { animation-delay: 0.35s; }
    .card-3d:nth-child(8) { animation-delay: 0.4s; }
    .card-3d:nth-child(9) { animation-delay: 0.45s; }

    .card-number-badge {
      display: inline-flex;
      margin-bottom: 1rem;
    }
    .card-number {
      background: var(--red-accent);
      width: 44px;
      height: 44px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      font-size: 1.4rem;
      font-weight: 800;
      color: #000;
      box-shadow: 0 0 12px rgba(255,51,102,0.7);
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .card-3d:hover .card-number {
      transform: scale(1.08);
      box-shadow: 0 0 20px var(--red-accent);
    }

    .card-title {
      font-family: 'Poppins', sans-serif;
      font-weight: 700;
      font-size: 1.5rem;
      margin-bottom: 0.75rem;
      color: white;
      letter-spacing: -0.3px;
      line-height: 1.3;
    }

    .card-text {
      color: rgba(240, 243, 248, 0.85);
      line-height: 1.55;
      font-size: 0.92rem;
      font-weight: 400;
    }

    .contact-block {
      background: rgba(0, 0, 0, 0.45);
      backdrop-filter: blur(16px);
      border-radius: 2.5rem;
      padding: 2.5rem 2rem;
      text-align: center;
      border: 1px solid rgba(42,212,255,0.3);
      margin: 2rem 0 2rem;
      transition: transform 0.25s, box-shadow 0.3s;
    }
    .contact-block:hover {
      transform: translateY(-5px);
      box-shadow: 0 20px 35px -12px rgba(0,247,255,0.2);
      border-color: var(--cyan-glow);
    }
    .contact-block h3 {
      font-size: 1.8rem;
      font-weight: 700;
      font-family: 'Poppins', sans-serif;
      margin-bottom: 0.8rem;
    }
    .contact-block p {
      color: rgba(255,255,255,0.75);
      max-width: 500px;
      margin: 0 auto 1.5rem auto;
    }
    .btn-3d {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      background: linear-gradient(110deg, rgba(42,212,255,0.2), rgba(0,163,204,0.1));
      border: 1px solid var(--cyan-glow);
      padding: 0.85rem 2.2rem;
      border-radius: 60px;
      font-weight: 700;
      color: white;
      text-decoration: none;
      transition: all 0.25s;
      backdrop-filter: blur(4px);
      font-size: 1rem;
    }
    .btn-3d:hover {
      background: var(--cyan-glow);
      color: #04131f;
      transform: scale(1.02);
      box-shadow: 0 0 18px var(--cyan-glow);
      border-color: white;
    }

    .modern-footer {
      position: relative;
      margin-top: 1rem;
      padding: 2rem 1.5rem 1.8rem;
      text-align: center;
      border-top: 1px solid rgba(42,212,255,0.2);
      flex-shrink: 0;
      background: transparent;
    }
    .footer-links {
      display: flex;
      justify-content: center;
      gap: 2rem;
      flex-wrap: wrap;
      margin-bottom: 1.2rem;
    }
    .footer-links a {
      color: rgba(255,255,255,0.7);
      text-decoration: none;
      font-weight: 500;
      transition: 0.2s;
      cursor: pointer;
      border-bottom: 1px dotted transparent;
      font-size: 0.9rem;
    }
    .footer-links a:hover {
      color: var(--cyan-glow);
      border-bottom-color: var(--cyan-glow);
    }
    .copyright {
      font-size: 0.75rem;
      opacity: 0.6;
      letter-spacing: 1px;
    }

    .modal-3d {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.85);
      backdrop-filter: blur(12px);
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 10000;
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.3s, visibility 0.3s;
    }
    .modal-3d.active {
      opacity: 1;
      visibility: visible;
    }
    .modal-card {
      background: rgba(8, 18, 26, 0.96);
      backdrop-filter: blur(16px);
      width: 92%;
      max-width: 880px;
      max-height: 85vh;
      border-radius: 2rem;
      border: 1px solid var(--cyan-glow);
      padding: 2rem;
      overflow-y: auto;
      transform: scale(0.96);
      transition: transform 0.3s ease;
      box-shadow: 0 30px 50px rgba(0,0,0,0.6);
    }
    .modal-3d.active .modal-card {
      transform: scale(1);
    }
    .modal-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid rgba(42,212,255,0.3);
      margin-bottom: 1.5rem;
      padding-bottom: 0.8rem;
    }
    .modal-header h2 {
      font-family: 'Poppins', sans-serif;
      font-size: 1.8rem;
      background: linear-gradient(120deg, #fff, var(--cyan-glow));
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }
    .close-modal {
      background: none;
      border: none;
      font-size: 1.8rem;
      color: rgba(255,255,255,0.7);
      cursor: pointer;
      transition: 0.2s;
    }
    .close-modal:hover {
      color: var(--red-accent);
      transform: rotate(90deg);
    }
    .modal-body {
      color: #eef2ff;
      line-height: 1.6;
    }
    .modal-body h3 {
      color: var(--cyan-glow);
      margin: 1.2rem 0 0.5rem;
      font-size: 1.3rem;
    }
    .modal-body p, .modal-body li {
      font-size: 0.9rem;
      margin-bottom: 0.5rem;
    }
    .modal-body ul {
      padding-left: 1.2rem;
      margin-bottom: 0.75rem;
    }
    .modal-body a {
      color: var(--cyan-glow);
      text-decoration: none;
    }

    ::-webkit-scrollbar {
      width: 6px;
    }
    ::-webkit-scrollbar-track {
      background: #04131f;
    }
    ::-webkit-scrollbar-thumb {
      background: var(--cyan-glow);
      border-radius: 12px;
    }

    @media (max-width: 780px) {
      .page-header { padding: 1rem 1rem 0.8rem 1rem; }
      .main-container { padding: 0 1rem 2rem 1rem; }
      .title-section h2 { font-size: 2.2rem; }
      .card-3d { padding: 1.5rem; }
      .card-title { font-size: 1.3rem; }
      .contact-block h3 { font-size: 1.5rem; }
    }
    @media (max-width: 480px) {
      .brand h1 { font-size: 1.3rem; }
      .title-section h2 { font-size: 1.9rem; }
      .terms-grid-3d { gap: 1.2rem; }
    }