:root {
  --bg-1: #050507;
  --bg-2: #101018;
  --bg-3: #111118;
  --bg-4: #141420;
  --bg-5: #1b1b30;
  --bg-6: #1d1d3a;

  --cyan: #00e1ff;
  --cyan-2: #00d4ff;
  --purple: #8a2be2;
  --purple-2: #3b1d8a;
  --purple-3: #2D2D77;
  --blue: #4b7cff;
  --blue-2: #6f6fff;
  --teal: #02AD88;

  --white: #ffffff;
  --text-muted: #b6b6c9;
  --text-dim: #7a7a7a;

  --font-heading: 'Poppins', sans-serif;
  --font-body: 'Roboto', sans-serif;

  --radius: 16px;
  --container: 1140px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--white);
  background: var(--bg-2);
  line-height: 1.6;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  margin: 0 0 16px;
}

p { margin: 0 0 16px; color: var(--text-muted); }

a { color: inherit; text-decoration: none; }

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

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 96px 0; position: relative; }

.eyebrow {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 13px;
  letter-spacing: 3px;
  color: var(--cyan);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.section-title { font-size: clamp(28px, 4vw, 40px); }

.section-lead {
  max-width: 640px;
  color: var(--text-muted);
}

.center { text-align: center; margin-left: auto; margin-right: auto; }

/* Botones */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: 50px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--cyan), var(--blue));
  color: #050507;
  box-shadow: 0 8px 24px rgba(0, 225, 255, .25);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(0, 225, 255, .35); }

.btn-outline {
  background: transparent;
  border-color: var(--purple);
  color: var(--white);
}
.btn-outline:hover { background: rgba(138, 43, 226, .15); transform: translateY(-2px); }

.btn-block { width: 100%; justify-content: center; }
.btn[disabled] { opacity: .6; cursor: not-allowed; transform: none !important; }

/* Header */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(5, 5, 7, .7);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,.06);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
}

.site-header .logo img { height: 36px; }

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
  margin: 0; padding: 0;
  font-family: var(--font-heading);
  font-size: 14px;
}

.nav-links a { color: var(--text-muted); transition: color .2s ease; }
.nav-links a:hover { color: var(--cyan); }

.nav-toggle { display: none; background: none; border: none; color: var(--white); font-size: 24px; cursor: pointer; }

@media (max-width: 860px) {
  .nav-links {
    position: fixed;
    top: 84px; left: 0; right: 0;
    background: var(--bg-3);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    display: none;
    border-bottom: 1px solid rgba(255,255,255,.08);
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
}

/* Hero */
.hero {
  position: relative;
  padding: 200px 0 120px;
  overflow: hidden;
  background: #0C0C1D;
}

.hero-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(180deg, #0C0C1D 14%, rgba(0,0,0,.4) 100%);
  z-index: 1;
}

.hero .container { position: relative; z-index: 2; text-align: center; }

.hero .logo-grande {
  max-width: 420px;
  width: 80%;
  margin: 0 auto 32px;
}

.hero h1 {
  font-size: clamp(32px, 5vw, 52px);
  max-width: 780px;
  margin: 0 auto 32px;
}

.btn-outline-teal {
  background: transparent;
  border: 1px solid var(--teal);
  color: var(--white);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.btn-outline-teal:hover {
  background: rgba(2, 173, 136, .15);
  transform: translateY(-2px);
}

@media (max-width: 767px) {
  .hero { background-attachment: scroll; }
}

/* Clientes */
.clientes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 56px;
}

.cliente-logo {
  background: var(--white);
  border: 1px solid var(--purple);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 110px;
  transition: transform .2s ease;
}
.cliente-logo:hover { transform: translateY(-4px); }
.cliente-logo img { max-height: 70px; width: auto; object-fit: contain; }

@media (max-width: 860px) {
  .clientes-grid { grid-template-columns: repeat(2, 1fr); }
}

/* Estudios (estilo AIM) */
.estudios {
  background: var(--bg-3);
}

.estudios-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
  margin-top: 56px;
}

.study-card {
  background: linear-gradient(160deg, var(--bg-5), var(--bg-4));
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}

.study-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 225, 255, .4);
  box-shadow: 0 16px 40px rgba(0, 0, 0, .4);
}

.study-card__img { aspect-ratio: 3 / 2; overflow: hidden; }
.study-card__img img { width: 100%; height: 100%; object-fit: cover; }

.study-card__body { padding: 24px; display: flex; flex-direction: column; flex: 1; }

.study-card__category {
  display: inline-block;
  align-self: flex-start;
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  font-family: var(--font-heading);
  color: var(--teal);
  background: rgba(2, 173, 136, .12);
  border: 1px solid rgba(2, 173, 136, .4);
  border-radius: 50px;
  padding: 5px 14px;
  margin-bottom: 14px;
}

.study-card__title {
  font-size: 20px;
  margin-bottom: 6px;
}

.study-card__date {
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.study-card__desc {
  font-size: 14px;
  flex: 1;
  margin-bottom: 20px;
}

.study-card__cta {
  align-self: flex-start;
}

.estudios-empty {
  color: var(--text-dim);
  margin-top: 40px;
}

/* Quienes somos / Qué hacemos */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

@media (max-width: 860px) {
  .split { grid-template-columns: 1fr; }
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  background: var(--white);
  color: var(--bg-2);
  border: 1px solid var(--purple);
  border-radius: 50px;
  padding: 8px 18px;
  font-size: 13px;
  font-family: var(--font-heading);
  font-weight: 600;
  margin: 4px 6px 4px 0;
}

.servicios-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-top: 56px;
}

.servicio-card {
  background: var(--bg-4);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius);
  padding: 28px;
}

.servicio-card h3 { font-size: 18px; color: var(--cyan); }
.servicio-card p { font-size: 14px; margin-bottom: 0; }

/* Contacto / CTA final */
.cta-final {
  background: linear-gradient(135deg, var(--purple-3), var(--bg-2));
  text-align: center;
}

.contacto-info {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
  margin-top: 32px;
  font-family: var(--font-heading);
  font-size: 14px;
}

/* Footer */
.site-footer {
  background: var(--bg-1);
  padding: 48px 0;
  text-align: center;
  border-top: 1px solid rgba(255,255,255,.06);
}

.site-footer p { margin: 0; font-size: 13px; }

/* Modal descarga */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(5,5,7,.75);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 24px;
}

.modal-overlay.open { display: flex; }

.modal-box {
  background: var(--bg-4);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius);
  max-width: 420px;
  width: 100%;
  padding: 32px;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 16px; right: 16px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 20px;
  cursor: pointer;
}
.modal-close:hover { color: var(--white); }

.modal-box h3 { font-size: 20px; margin-bottom: 8px; }
.modal-box .modal-study-name { color: var(--cyan); font-size: 14px; margin-bottom: 20px; }

.form-field { margin-bottom: 16px; }
.form-field label {
  display: block;
  font-size: 13px;
  margin-bottom: 6px;
  color: var(--text-muted);
}
.form-field input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,.15);
  background: rgba(255,255,255,.04);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 14px;
}
.form-field input:focus {
  outline: none;
  border-color: var(--cyan);
}

.form-msg {
  font-size: 13px;
  margin-top: 14px;
  min-height: 18px;
}
.form-msg.success { color: var(--teal); }
.form-msg.error { color: #ff6b6b; }

.form-note {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 14px;
  margin-bottom: 0;
}