:root {
  --primary: #17355d;
  --primary-soft: #254978;
  --accent: #d7aa5b;
  --bg: #f6f7fb;
  --surface: #ffffff;
  --text: #17202c;
  --muted: #5b6675;
  --line: #dbe1ea;
  --shadow: 0 18px 40px rgba(19, 38, 66, 0.08);
  --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Open Sans", sans-serif;
  color: var(--text);
  background: var(--surface);
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(219, 225, 234, 0.8);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 78px;
  gap: 1rem;
}

.brand-logo img {
  width: auto;
  height: 54px;
  object-fit: contain;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
}

.main-nav a {
  font-weight: 600;
  color: var(--muted);
}

.main-nav a:hover { color: var(--primary); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .95rem 1.35rem;
  border-radius: 999px;
  border: 1px solid var(--primary);
  background: var(--primary);
  color: white !important;
  font-weight: 700;
  transition: .25s ease;
}

.btn:hover { transform: translateY(-1px); }
.btn-outline {
  background: transparent;
  color: var(--primary) !important;
}
.btn-sm { padding: .75rem 1rem; }
.btn-light {
  background: white;
  color: var(--primary) !important;
  border-color: white;
}

/* Banner con parallax */
.parallax-banner {
  min-height: 78vh;
  background-image: url("banner.jpg");
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  position: relative;
}

.parallax-overlay {
  min-height: 78vh;
  display: flex;
  align-items: center;
  background: linear-gradient(90deg, rgba(255,255,255,.94) 0%, rgba(255,255,255,.78) 48%, rgba(255,255,255,.22) 100%);
}

.banner-content {
  padding: 6rem 0;
}

.eyebrow,
.section-tag {
  text-transform: uppercase;
  letter-spacing: .14em;
  font-size: .78rem;
  font-weight: 700;
  color: var(--accent);
  margin: 0 0 1rem;
}

.section-tag.light { color: rgba(255,255,255,.85); }

h1,h2,h3 {
  margin: 0 0 1rem;
  font-family: "Montserrat", sans-serif;
  line-height: 1.15;
}

h1 { font-size: clamp(2.4rem, 6vw, 4.8rem); max-width: 12ch; }
h2 { font-size: clamp(1.7rem, 3vw, 2.6rem); }
h3 { font-size: 1.15rem; }

.lead {
  font-size: 1.08rem;
  color: var(--muted);
  max-width: 60ch;
}

.hero {
  background:
    radial-gradient(circle at top left, rgba(215,170,91,.18), transparent 26%),
    linear-gradient(180deg, #f9fbff 0%, #eef3fb 100%);
  padding: 5rem 0 4rem;
}

.hero-grid,
.two-col,
.contact-grid,
.cta-wrap,
.footer-wrap {
  display: grid;
  gap: 2rem;
}

.hero-grid,
.contact-grid {
  grid-template-columns: 1.2fr .8fr;
  align-items: center;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
}

.hero-card,
.contact-card,
.info-card,
.speaker-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-card { padding: 1.4rem; }

.stat-box {
  padding: 1.2rem;
  border-radius: 18px;
  background: var(--bg);
  margin-bottom: 1rem;
}

.stat-box strong,
.event-detail strong {
  display: block;
  font-family: "Montserrat", sans-serif;
  font-size: 1.15rem;
  margin-bottom: .45rem;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.stat-row div,
.event-detail {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 18px;
}

.stat-row span,
.event-detail span,
.time {
  display: block;
  color: var(--muted);
  font-size: .92rem;
}

.section { padding: 4.5rem 0; }
.muted { background: var(--bg); }

.two-col {
  grid-template-columns: .9fr 1.1fr;
  align-items: start;
}

.section-head { margin-bottom: 2rem; }

.card-grid,
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.info-card,
.speaker-card,
.feature { padding: 1.5rem; }

.feature {
  border: 1px solid var(--line);
  border-radius: 20px;
}

.cta-band {
  background: linear-gradient(135deg, var(--primary), #285388);
  color: white;
}

.cta-wrap,
.footer-wrap {
  grid-template-columns: 1fr auto;
  align-items: center;
}

.contact-card {
  padding: 1.35rem;
  display: grid;
  gap: 1rem;
}

label {
  display: grid;
  gap: .45rem;
  font-weight: 600;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: .9rem 1rem;
  font: inherit;
}

textarea {
  min-height: 140px;
  resize: vertical;
}

.site-footer {
  padding: 1.8rem 0 2rem;
  border-top: 1px solid var(--line);
  background: #fbfcfe;
}

.footer-brand {
  display: grid;
  gap: .75rem;
}

.footer-brand img {
  height: 46px;
  width: auto;
  object-fit: contain;
}

.footer-brand p {
  margin: 0;
  max-width: 52ch;
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.congress-hero .hero-card {
  display: grid;
  gap: .9rem;
}

.agenda-list {
  display: grid;
  gap: 1rem;
}

.agenda-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 1rem;
  padding: 1.2rem;
  background: white;
  border: 1px solid var(--line);
  border-radius: 20px;
}

.avatar {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--bg);
  color: var(--primary);
  font-family: "Montserrat", sans-serif;
  font-weight: 700;
  margin-bottom: 1rem;
}

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  padding: 0;
  width: 42px;
  height: 42px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--primary);
  margin: 7px 0;
  border-radius: 99px;
}

@media (max-width: 900px) {
  .parallax-banner,
  .parallax-overlay {
    min-height: 70vh;
    background-attachment: scroll;
  }

  .parallax-overlay {
    background: rgba(255,255,255,.86);
  }

  .brand-logo img {
    height: 44px;
  }

  .hero-grid,
  .two-col,
  .contact-grid,
  .cta-wrap,
  .footer-wrap,
  .card-grid,
  .features {
    grid-template-columns: 1fr;
  }

  .main-nav {
    position: absolute;
    top: 78px;
    left: 0;
    right: 0;
    background: white;
    border-bottom: 1px solid var(--line);
    padding: 1rem;
    display: none;
    flex-direction: column;
    align-items: stretch;
  }

  .main-nav.open { display: flex; }
  .nav-toggle { display: block; }

  .agenda-item { grid-template-columns: 1fr; }
}


.centered {
  text-align: center;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.registration-section {
  background:
    radial-gradient(circle at top right, rgba(215,170,91,.14), transparent 28%),
    linear-gradient(180deg, #ffffff 0%, #f6f7fb 100%);
}

.registration-grid {
  display: grid;
  grid-template-columns: .85fr 1.15fr;
  gap: 1.4rem;
  align-items: start;
}

.payment-card,
.registration-form {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
}

.payment-card .price {
  font-family: "Montserrat", sans-serif;
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--primary);
  margin: .3rem 0 1rem;
}

.small-note {
  margin-top: 1rem;
  color: var(--muted);
  font-size: .9rem;
}

.registration-form {
  display: grid;
  gap: 1rem;
}

.registration-form input[type="file"] {
  background: #fff;
  cursor: pointer;
}

.form-message {
  margin: 0;
  font-weight: 700;
  color: var(--primary);
}

@media (max-width: 900px) {
  .registration-grid {
    grid-template-columns: 1fr;
  }
}