/* ====================================
   Dr. Maikel Leyva Vázquez — personal site
   Paleta: navy + gold + off-white
   Tipografía: Playfair Display (títulos) + Inter (cuerpo)
   ==================================== */

:root {
  --navy: #1F4E79;
  --navy-deep: #143352;
  --gold: #B8860B;
  --gold-light: #D4A32C;
  --ink: #14181F;
  --ink-soft: #3B4451;
  --bg: #FAF8F3;
  --bg-paper: #FFFFFF;
  --bg-dark: #0E1A2A;
  --line: #E3DED2;
  --line-dark: #1F304A;
  --radius: 6px;
  --max-w: 1120px;
  --transition: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
}

a { color: var(--navy); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--gold); }

h1, h2, h3, h4 { font-family: 'Playfair Display', Georgia, serif; font-weight: 700; }

em, .italic { font-style: italic; }

/* ============ NAVBAR ============ */
.navbar {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 1rem 0;
  background: rgba(250, 248, 243, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}
.navbar.scrolled {
  border-bottom-color: var(--line);
  padding: 0.6rem 0;
}

.nav-container {
  display: flex; align-items: center; justify-content: space-between;
}

.nav-logo {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--navy);
  letter-spacing: 0.04em;
}

.nav-menu {
  display: flex; gap: 2rem;
  list-style: none;
  align-items: center;
}
.nav-menu a {
  font-size: 0.93rem;
  font-weight: 500;
  color: var(--ink-soft);
  position: relative;
}
.nav-menu a:not(.nav-cta)::after {
  content: '';
  position: absolute; bottom: -6px; left: 0;
  width: 0; height: 2px;
  background: var(--gold);
  transition: width var(--transition);
}
.nav-menu a:not(.nav-cta):hover::after { width: 100%; }

.nav-cta {
  background: var(--navy);
  color: #fff !important;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius);
  transition: background var(--transition);
}
.nav-cta:hover { background: var(--gold); }

.nav-toggle {
  display: none;
  background: none; border: none;
  flex-direction: column; gap: 5px;
  cursor: pointer;
  padding: 0.5rem;
}
.nav-toggle span {
  width: 24px; height: 2px;
  background: var(--navy);
  transition: all var(--transition);
}

/* ============ HERO ============ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 9rem 0 4rem;
  position: relative;
  background:
    radial-gradient(ellipse at top right, rgba(184,134,11,0.09) 0%, transparent 50%),
    radial-gradient(ellipse at bottom left, rgba(31,78,121,0.07) 0%, transparent 50%),
    var(--bg);
}

.hero-inner {
  display: grid;
  grid-template-columns: auto 1.4fr 1fr;
  gap: 3rem;
  align-items: center;
}

/* --- Hero photo --- */
.hero-photo-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
}
.hero-photo {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--gold);
  box-shadow: 0 10px 40px rgba(31, 78, 121, 0.18);
  transition: transform var(--transition), box-shadow var(--transition);
}
.hero-photo:hover {
  transform: scale(1.04);
  box-shadow: 0 14px 50px rgba(184, 134, 11, 0.25);
}

.hero-eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--gold);
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.8rem);
  line-height: 1.04;
  color: var(--navy-deep);
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}
.accent {
  color: var(--gold);
  font-style: italic;
  position: relative;
}
.accent::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: 0.05em;
  height: 10px;
  background: rgba(184,134,11,0.18);
  z-index: -1;
}

.hero-subtitle {
  font-size: 1.1rem;
  line-height: 1.65;
  color: var(--ink-soft);
  margin-bottom: 2rem;
  max-width: 44ch;
}

.hero-cta { display: flex; gap: 1rem; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 0.85rem 1.6rem;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius);
  text-align: center;
  transition: all var(--transition);
  border: 2px solid transparent;
}
.btn-primary { background: var(--navy); color: #fff !important; }
.btn-primary:hover { background: var(--gold); transform: translateY(-2px); }
.btn-ghost { background: transparent; color: var(--navy) !important; border-color: var(--navy); }
.btn-ghost:hover { background: var(--navy); color: #fff !important; }

.hero-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.meta-stat {
  background: var(--bg-paper);
  padding: 1.6rem 1.3rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  text-align: center;
  transition: transform var(--transition);
}
.meta-stat:hover {
  transform: translateY(-4px);
  border-color: var(--gold);
}
.stat-num {
  display: block;
  font-family: 'Playfair Display', serif;
  font-size: 2.3rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1;
  margin-bottom: 0.4rem;
}
.stat-label {
  display: block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
  line-height: 1.3;
}

.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--ink-soft);
  font-size: 1.4rem;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-10px); }
}

/* ============ SECTIONS ============ */
.section {
  padding: 6rem 0;
}
.section-dark {
  background: var(--bg-dark);
  color: #E8EAF0;
}
.section-dark .section-title { color: #fff; }
.section-dark .section-lead { color: #B8C1D0; }
.section-dark a { color: var(--gold-light); }

.section-eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--gold);
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  line-height: 1.15;
  color: var(--navy-deep);
  margin-bottom: 2rem;
  letter-spacing: -0.01em;
  max-width: 20ch;
}

.section-lead {
  font-size: 1.08rem;
  color: var(--ink-soft);
  max-width: 65ch;
  margin-bottom: 3rem;
  line-height: 1.6;
}

/* ============ ABOUT ============ */
.about-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 3rem;
  margin-top: 2rem;
}

.about-text p {
  margin-bottom: 1.2rem;
  color: var(--ink-soft);
  font-size: 1.02rem;
}
.about-text p:last-child {
  font-style: italic;
  border-left: 3px solid var(--gold);
  padding-left: 1.2rem;
  color: var(--navy);
}
.about-text strong { color: var(--ink); font-weight: 600; }

.about-card {
  background: var(--bg-paper);
  padding: 2rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  align-self: start;
}
.about-card h3 {
  font-family: 'Inter', sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--gold);
  margin-bottom: 1rem;
  margin-top: 1.5rem;
}
.about-card h3:first-child { margin-top: 0; }

.about-list {
  list-style: none;
  margin-bottom: 0.5rem;
}
.about-list li {
  padding: 0.4rem 0;
  font-size: 0.92rem;
  border-bottom: 1px dashed var(--line);
}
.about-list li:last-child { border-bottom: none; }
.about-list.plain li { border: none; padding: 0.3rem 0; color: var(--ink-soft); }

/* ============ BOOKS ============ */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.book-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition);
}
.book-card:hover { transform: translateY(-6px); }

.book-cover {
  height: 280px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 2rem;
  color: #fff;
  position: relative;
}
.book-third {
  background:
    linear-gradient(135deg, #1A1A2E 0%, #16213E 100%),
    radial-gradient(circle at 70% 30%, #E94560 0%, transparent 50%);
  background-blend-mode: screen;
}
.book-honest {
  background: linear-gradient(135deg, #B8860B 0%, #8B6508 100%);
}
.book-neutro {
  background: linear-gradient(135deg, #1F4E79 0%, #143352 100%);
}
.book-typek {
  background:
    linear-gradient(135deg, #0B132B 0%, #1C2541 100%),
    radial-gradient(circle at 30% 25%, #5BC0BE 0%, transparent 55%);
  background-blend-mode: screen;
}
.book-year {
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  opacity: 0.8;
}
.book-title-cover {
  font-family: 'Playfair Display', serif;
  font-size: 2rem;
  line-height: 1.05;
  font-weight: 700;
}

.book-body {
  padding: 1.8rem;
}
.book-body h3 {
  font-size: 1.25rem;
  color: #fff;
  margin-bottom: 0.5rem;
}
.book-sub {
  font-size: 0.9rem;
  color: #B8C1D0;
  margin-bottom: 0.8rem;
  font-style: italic;
}
.book-sub-italic {
  color: var(--gold-light);
  font-weight: 500;
}
.book-authors {
  font-size: 0.82rem;
  color: var(--gold-light);
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}
.book-body p {
  font-size: 0.92rem;
  color: #B8C1D0;
  line-height: 1.6;
  margin-bottom: 0.9rem;
}
.book-publisher {
  font-size: 0.82rem !important;
  color: #8A95A7 !important;
  font-style: italic;
}

.book-action {
  display: inline-block;
  margin-top: 1.1rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gold-light);
  text-decoration: none;
  border-bottom: 1px solid rgba(212,163,44,0.35);
  padding-bottom: 1px;
  letter-spacing: 0.02em;
  transition: border-color var(--transition), color var(--transition);
}
.book-action:hover {
  color: #e8bc52;
  border-color: #e8bc52;
}

/* ============ BOTS ============ */
.bots-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}
.bot-card {
  background: var(--bg-paper);
  padding: 2rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  transition: all var(--transition);
}
.bot-card:hover {
  border-color: var(--gold);
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(31,78,121,0.08);
}
.bot-icon {
  font-size: 2.2rem;
  margin-bottom: 1rem;
}
.bot-card h3 {
  color: var(--navy);
  font-size: 1.4rem;
  margin-bottom: 0.6rem;
}
.bot-card p {
  color: var(--ink-soft);
  font-size: 0.93rem;
  line-height: 1.55;
}

/* ============ PAPERS ============ */
.papers-list {
  display: grid;
  gap: 1.5rem;
  margin-top: 2rem;
}
.paper {
  background: rgba(255,255,255,0.03);
  border-left: 3px solid var(--gold);
  padding: 1.4rem 1.8rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: background var(--transition);
}
.paper:hover { background: rgba(255,255,255,0.06); }
.paper-year {
  font-size: 0.82rem;
  letter-spacing: 0.15em;
  color: var(--gold-light);
  font-weight: 600;
}
.paper h3 {
  font-family: 'Inter', sans-serif;
  font-size: 1.12rem;
  color: #fff;
  margin: 0.4rem 0;
  font-weight: 600;
}
.paper p {
  font-size: 0.92rem;
  color: #B8C1D0;
}
.paper-venue {
  font-size: 0.88rem !important;
  color: #8A95A7 !important;
  margin-top: 0.3rem;
}

/* ============ PILLARS ============ */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}
.pillar {
  padding: 2rem;
  background: var(--bg-paper);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  position: relative;
  transition: all var(--transition);
}
.pillar:hover {
  border-color: var(--navy);
  transform: translateY(-4px);
}
.pillar-num {
  font-family: 'Playfair Display', serif;
  font-size: 2.5rem;
  color: var(--gold);
  opacity: 0.4;
  display: block;
  line-height: 1;
  margin-bottom: 0.8rem;
}
.pillar h3 {
  color: var(--navy-deep);
  font-size: 1.3rem;
  margin-bottom: 0.7rem;
}
.pillar p {
  color: var(--ink-soft);
  font-size: 0.95rem;
  line-height: 1.55;
}

/* ============ CONTACT ============ */
.section-contact {
  background: linear-gradient(180deg, var(--bg) 0%, #F0EBE0 100%);
}
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-top: 2rem;
}
.contact-options h3 {
  font-family: 'Inter', sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--gold);
  margin-bottom: 1rem;
}

.contact-details { display: grid; gap: 1rem; align-content: start; }
.contact-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.1rem 1.5rem;
  background: var(--bg-paper);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  color: var(--ink);
  transition: all var(--transition);
}
.contact-link:hover:not(.static) {
  border-color: var(--gold);
  transform: translateX(4px);
  color: var(--navy);
}
.contact-label {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--ink-soft);
}
.contact-value {
  font-weight: 500;
  font-size: 0.98rem;
}

/* ============ FOOTER ============ */
.footer {
  background: var(--bg-dark);
  color: #8A95A7;
  padding: 2.5rem 0;
  text-align: center;
  border-top: 1px solid var(--line-dark);
}
.footer-inner p { margin: 0.3rem 0; font-size: 0.88rem; }
.footer-quote {
  font-family: 'Playfair Display', serif;
  font-style: italic;
  color: var(--gold-light) !important;
  font-size: 1rem !important;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 900px) {
  .hero { padding-top: 7rem; }
  .hero-inner { grid-template-columns: 1fr; gap: 2rem; }
  .hero-photo-wrapper { order: -1; }
  .hero-photo { width: 160px; height: 160px; }
  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
  .contact-grid { grid-template-columns: 1fr; gap: 2rem; }
  .section { padding: 4rem 0; }
}

@media (max-width: 700px) {
  .container { padding: 0 1.3rem; }
  .nav-menu {
    position: fixed;
    top: 60px; right: -100%;
    flex-direction: column;
    background: var(--bg-paper);
    width: 78%; height: 100vh;
    padding: 2rem;
    gap: 1.5rem;
    align-items: flex-start;
    transition: right var(--transition);
    box-shadow: -10px 0 40px rgba(0,0,0,0.08);
  }
  .nav-menu.open { right: 0; }
  .nav-toggle { display: flex; }
  .nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .hero-meta { grid-template-columns: 1fr 1fr; }
  .meta-stat { padding: 1.2rem 1rem; }
  .stat-num { font-size: 1.8rem; }
}

@media (max-width: 500px) {
  .hero-cta { flex-direction: column; }
  .btn { width: 100%; }
  .hero-meta { grid-template-columns: 1fr; }
}

/* ============ ANIMATIONS ============ */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}