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

:root {
  --blue:       #5F86A6;
  --blue-dark:  #3f6180;
  --blue-light: #8aafc9;
  --bg:         #EDF4FA;
  --white:      #ffffff;
  --text:       #1a2a36;
  --text-muted: #6a8599;
  --line:       rgba(95,134,166,0.22);
  --font:       'EB Garamond', Georgia, serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 18px;
  line-height: 1.6;
  overflow-x: hidden;
}

/* ─── NAV ─────────────────────────────────── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(237,244,250,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  padding: 0 5vw;
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.nav-logo { text-decoration: none; display: flex; align-items: center; }
.nav-logo-img { height: 38px; width: auto; }
.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a {
  font-size: 0.88rem; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--text-muted); text-decoration: none; font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--blue); }
.nav-cta {
  background: var(--blue); color: #fff !important;
  padding: 0.45em 1.2em; border-radius: 2px;
  font-size: 0.82rem !important; letter-spacing: 0.1em !important;
}
.nav-cta:hover { background: var(--blue-dark); color: #fff !important; }

.nav-burger { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
.nav-burger span { display: block; width: 24px; height: 2px; background: var(--blue); transition: 0.3s; }

/* ─── HERO ────────────────────────────────── */
#hero {
  min-height: 100vh;
  display: flex; flex-direction: column; justify-content: center;
  padding: 120px 5vw 6vh;
  position: relative;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background: linear-gradient(160deg, #d4e8f5 0%, var(--bg) 55%);
  z-index: 0;
}
.hero-circle {
  position: absolute; top: -5vh; right: -5vw;
  width: clamp(260px, 38vw, 560px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 40%, rgba(95,134,166,0.13) 0%, rgba(95,134,166,0.03) 70%);
  z-index: 0;
}
.hero-line-v {
  position: absolute; left: 5vw; top: 64px; bottom: 0; width: 1px;
  background: linear-gradient(to bottom, transparent, var(--line) 20%, var(--line) 80%, transparent);
  z-index: 0;
}
.hero-content { position: relative; z-index: 1; max-width: 680px; }
.hero-atp-logo {
  height: clamp(60px, 10vw, 120px); width: auto;
  display: block;
  margin-bottom: 2rem;
  opacity: 0; animation: fadeUp 0.8s 0.05s forwards;
}
.hero-tag {
  display: inline-block;
  font-size: 0.8rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--blue); border: 1px solid var(--blue-light);
  padding: 0.35em 1em; margin-bottom: 2rem;
  opacity: 0; animation: fadeUp 0.8s 0.2s forwards;
}
.hero-title {
  font-size: clamp(2.8rem, 7vw, 6.5rem);
  font-weight: 400; line-height: 1.05; letter-spacing: -0.01em;
  color: var(--text);
  opacity: 0; animation: fadeUp 0.9s 0.35s forwards;
}
.hero-title em {
  font-style: italic; color: var(--blue); display: block;
}
.hero-sub {
  margin-top: 1.8rem;
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  color: var(--text-muted); max-width: 520px; font-weight: 400;
  opacity: 0; animation: fadeUp 0.9s 0.5s forwards;
}
.hero-meta {
  margin-top: 2.5rem; display: flex; gap: 2.5rem; flex-wrap: wrap;
  opacity: 0; animation: fadeUp 0.9s 0.65s forwards;
}
.hero-meta-item { display: flex; flex-direction: column; }
.hero-meta-label {
  font-size: 0.7rem; letter-spacing: 0.15em; text-transform: uppercase;
  color: var(--blue-light); margin-bottom: 0.15rem;
}
.hero-meta-val { font-size: 1rem; font-weight: 600; color: var(--text); }
.hero-highlights {
  display: flex; gap: 0.8rem; flex-wrap: wrap;
  margin-top: 2rem;
  opacity: 0; animation: fadeUp 0.9s 0.8s forwards;
}
.hero-highlight-item {
  display: flex; align-items: center; gap: 0.5rem;
  background: var(--blue);
  padding: 0.45em 1em; border-radius: 2px;
  font-size: 0.78rem; font-weight: 700; color: white;
  letter-spacing: 0.08em; text-transform: uppercase;
}
.hero-highlight-item svg { flex-shrink: 0; stroke: white; }
.hero-meta-date { position: relative; }
.hero-date-big {
  font-size: 1.5rem !important;
  font-weight: 800 !important;
  color: var(--blue) !important;
  letter-spacing: -0.01em;
}
.hero-actions {
  display: flex; gap: 1rem; flex-wrap: wrap;
  margin-top: 2rem;
  opacity: 0; animation: fadeUp 0.9s 0.95s forwards;
}
.btn-ig {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font); font-size: 0.8rem; font-weight: 500;
  letter-spacing: 0.05em;
  padding: 0.6em 1.1em; border-radius: 2px;
  text-decoration: none; transition: transform 0.15s, color 0.2s;
  border: none; border-bottom: 1px solid var(--blue-light);
  color: var(--text-muted); background: transparent;
}
.btn-ig:hover { color: var(--blue); transform: translateY(-1px); }
.btn-ig svg { width: 14px; height: 14px; flex-shrink: 0; }
.hero-scroll {
  position: absolute; bottom: 3vh; right: 5vw;
  display: flex; flex-direction: column; align-items: center; gap: 0.6rem;
  color: var(--text-muted); font-size: 0.72rem; letter-spacing: 0.14em;
  text-transform: uppercase; z-index: 1;
  opacity: 0; animation: fadeIn 1s 1.2s forwards;
}
.hero-scroll-line {
  width: 1px; height: 60px;
  background: linear-gradient(to bottom, var(--blue-light), transparent);
  animation: scrollLine 2s 1.5s infinite;
}
@keyframes scrollLine {
  0%   { transform: scaleY(0); transform-origin: top; opacity: 1; }
  50%  { transform: scaleY(1); transform-origin: top; opacity: 1; }
  51%  { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; opacity: 0; }
}

/* ─── SECTIONS SHARED ─────────────────────── */
section { padding: 9vh 5vw; }
.section-inner { max-width: 1100px; margin: 0 auto; }
.section-header {
  display: grid; grid-template-columns: 1fr auto;
  align-items: end; border-bottom: 1px solid var(--line);
  padding-bottom: 1.5rem; margin-bottom: 4rem;
}
.section-num {
  font-size: 0.72rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--blue-light); margin-bottom: 0.5rem; display: block;
}
.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400; line-height: 1.1;
}
.section-title em { font-style: italic; color: var(--blue); }

/* ─── AGENDA ──────────────────────────────── */
#agenda { background: var(--white); }
.agenda-bloque { margin-bottom: 0.5rem; }
.agenda-bloque-hora {
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.15em;
  text-transform: uppercase; color: var(--blue);
  padding: 0.6rem 0 0.5rem;
  border-top: 1px solid var(--line);
  margin-bottom: 0.8rem;
}
.agenda-bloque-items {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}
.agenda-item-especial {
  background: var(--bg) !important;
  flex-direction: row !important;
  align-items: center;
  gap: 1rem;
}
.agenda-item-especial::before { display: none; }
.agenda-items {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}
.agenda-item {
  display: flex; flex-direction: column;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 1.8rem;
  transition: box-shadow 0.2s, transform 0.2s;
  position: relative; overflow: hidden;
}
.agenda-item:hover {
  box-shadow: 0 6px 24px rgba(95,134,166,0.13);
  transform: translateY(-2px);
}
.agenda-item::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 3px; background: var(--blue);
}
.agenda-item-icon {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1.1rem; font-size: 1.3rem;
  flex-shrink: 0;
}
.agenda-talk-title {
  font-size: 1.05rem; font-weight: 700; line-height: 1.35;
  margin-bottom: 0.5rem;
}
.agenda-talk-speaker {
  font-size: 0.85rem; color: var(--blue); margin-bottom: 0.6rem;
  font-style: italic; font-weight: 500;
}
.agenda-talk-desc {
  font-size: 0.85rem; color: var(--text-muted);
  line-height: 1.55; flex: 1;
}
.agenda-talk-type {
  display: inline-block; margin-top: 1rem;
  font-size: 0.65rem; letter-spacing: 0.14em; text-transform: uppercase;
  background: var(--bg); color: var(--blue);
  padding: 0.3em 0.8em; border-radius: 2px; font-weight: 700;
  align-self: flex-start;
}
.agenda-placeholder {
  color: var(--text-muted); font-style: italic;
  padding: 3rem 2rem; text-align: center;
  font-size: 1.05rem; grid-column: 1/-1;
}

/* ─── SPEAKERS ────────────────────────────── */
#speakers { background: var(--bg); }
.speakers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.5px; background: var(--line);
  border: 1px solid var(--line);
}
.speaker-card {
  background: var(--bg); padding: 2rem 1.8rem;
  transition: background 0.2s;
}
.speaker-card:hover { background: var(--white); }
.speaker-avatar {
  width: 72px; height: 72px; border-radius: 50%;
  background: linear-gradient(135deg, var(--blue-light), var(--blue));
  margin-bottom: 1.2rem; display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; color: white; font-weight: 500;
}
.speaker-name { font-size: 1.1rem; font-weight: 700; line-height: 1.2; }
.speaker-role { font-size: 0.88rem; color: var(--text-muted); margin-top: 0.3rem; font-style: italic; }
.speaker-institution { font-size: 0.8rem; color: var(--blue); margin-top: 0.5rem; font-weight: 500; letter-spacing: 0.03em; }
.speakers-placeholder {
  text-align: center; padding: 5rem 2rem;
  color: var(--text-muted); font-style: italic; font-size: 1.1rem;
  background: var(--bg); width: 100%;
}

/* ─── INSCRIPCIÓN ─────────────────────────── */
#inscripcion { background: var(--blue); color: var(--white); }
#inscripcion .section-num { color: rgba(255,255,255,0.45); }
#inscripcion .section-title { color: white; }
#inscripcion .section-title em { color: var(--bg); }
#inscripcion .section-header { border-bottom-color: rgba(255,255,255,0.15); }

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}
.form-group { display: flex; flex-direction: column; gap: 0.5rem; }
.form-group.full { grid-column: 1 / -1; }
.form-label {
  font-size: 0.75rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: rgba(255,255,255,0.6);
}
.form-input {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  color: white; font-family: var(--font); font-size: 1rem;
  padding: 0.75em 1em; outline: none;
  transition: border-color 0.2s, background 0.2s;
  border-radius: 2px;
}
.form-input::placeholder { color: rgba(255,255,255,0.35); }
.form-input:focus {
  border-color: rgba(255,255,255,0.6);
  background: rgba(255,255,255,0.15);
}
select.form-input option { background: var(--blue-dark); color: white; }
.form-submit {
  margin-top: 0.5rem;
  background: white; color: var(--blue);
  font-family: var(--font); font-size: 1rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  border: none; padding: 0.85em 3em; cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  border-radius: 2px;
}
.form-submit:hover { background: var(--bg); transform: translateY(-1px); }
.form-success {
  display: none;
  background: rgba(255,255,255,0.12); border: 1px solid rgba(255,255,255,0.3);
  padding: 1.5rem 2rem; text-align: center;
  font-size: 1.1rem; font-style: italic; color: white;
  border-radius: 2px; margin-top: 1rem;
}

/* ─── CONTACTO ────────────────────────────── */
#contacto { background: var(--white); }
.contacto-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: start;
}
.contacto-info { }
.contacto-item { padding: 1.8rem 0; border-bottom: 1px solid var(--line); }
.contacto-item:first-child { border-top: 1px solid var(--line); }
.contacto-item-label {
  font-size: 0.72rem; letter-spacing: 0.17em; text-transform: uppercase;
  color: var(--blue-light); margin-bottom: 0.4rem;
}
.contacto-item-val { font-size: 1.15rem; font-weight: 500; }
.contacto-item-val a { color: var(--text); text-decoration: none; }
.contacto-item-val a:hover { color: var(--blue); }
.contacto-map {
  background: linear-gradient(135deg, #d4e8f5, var(--bg));
  border: 1px solid var(--line);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  min-height: 320px; text-align: center; padding: 2rem;
}
.map-icon {
  width: 52px; height: 52px; margin-bottom: 1rem;
  background: var(--blue); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
}
.map-icon svg { width: 26px; height: 26px; fill: white; }
.map-place { font-size: 1.2rem; font-weight: 600; margin-bottom: 0.4rem; }
.map-address { font-size: 0.95rem; color: var(--text-muted); font-style: italic; }
.map-link {
  margin-top: 1.2rem; display: inline-block;
  font-size: 0.8rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--blue); text-decoration: none; border-bottom: 1px solid var(--blue-light);
  padding-bottom: 0.15em; transition: color 0.2s;
}
.map-link:hover { color: var(--blue-dark); }

/* ─── FOOTER ──────────────────────────────── */
footer {
  background: var(--text); color: rgba(255,255,255,0.45);
  padding: 2.5rem 5vw;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 1.5rem;
  font-size: 0.82rem; letter-spacing: 0.04em;
}
.footer-logos { display: flex; align-items: center; gap: 2rem; }
.footer-logo-img { height: 36px; width: auto; }
.footer-atp-img  { height: 28px; width: auto; opacity: 0.85; }
.footer-social { display: flex; gap: 1.5rem; }
.footer-ig {
  display: flex; align-items: center; gap: 0.45rem;
  color: rgba(255,255,255,0.55); text-decoration: none;
  font-size: 0.82rem; transition: color 0.2s;
}
.footer-ig:hover { color: white; }

/* ─── ANIMATIONS ──────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(22px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; } to { opacity: 1; }
}
.reveal {
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-atp-logo, .hero-tag, .hero-title, .hero-sub, .hero-meta,
  .hero-highlights, .hero-actions, .hero-scroll, .reveal {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  .hero-scroll-line { animation: none !important; }
}

/* ─── RESPONSIVE ──────────────────────────── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: fixed; top: 64px; left: 0; right: 0;
    background: var(--bg); padding: 1.5rem 5vw;
    border-bottom: 1px solid var(--line); gap: 1.2rem;
  }
  .nav-burger { display: flex; }
  .form-grid { grid-template-columns: 1fr; }
  .contacto-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .section-header { grid-template-columns: 1fr; }
}