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

:root {
  --primary:      #1A1A1A;
  --primary-dark: #111111;
  --accent:       #C8952E;
  --accent-hover: #B07E22;
  --accent-light: rgba(200,149,46,0.10);
  --white:        #FFFFFF;
  --gray-50:      #F7F7F7;
  --gray-100:     #EEEEEE;
  --gray-200:     #E0E0E0;
  --gray-500:     #888888;
  --gray-700:     #444444;
  --green-badge:  #22C55E;
  --blue-badge:   #3B82F6;
  --bg-body:      #FFFFFF;
  --bg-alt:       #F7F7F7;
  --text-main:    #1A1A1A;
  --text-body:    #444444;
  --text-muted:   #888888;
  --border:       #E0E0E0;
  --radius:       12px;
  --shadow:       0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow-hover: 0 10px 20px rgba(0,0,0,.1), 0 4px 8px rgba(0,0,0,.06);
}

[data-theme="dark"] {
  --primary:      #F0F0F0;
  --white:        #1A1A1A;
  --gray-50:      #222222;
  --gray-100:     #333333;
  --gray-200:     #444444;
  --gray-500:     #AAAAAA;
  --gray-700:     #DDDDDD;
  --bg-body:      #121212;
  --bg-alt:       #1A1A1A;
  --text-main:    #F0F0F0;
  --text-body:    #DDDDDD;
  --text-muted:   #AAAAAA;
  --border:       #333333;
}

html { scroll-behavior: smooth; }
body { font-family: 'Inter', sans-serif; background: var(--bg-body); color: var(--text-main); line-height: 1.6; transition: background .3s, color .3s; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ═══ NAVBAR ═══ */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: var(--bg-body); border-bottom: 1px solid var(--border);
  transition: box-shadow .3s, background .3s;
}
.navbar.scrolled { box-shadow: 0 2px 12px rgba(0,0,0,.08); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.nav-logo-wrap { display: flex; align-items: center; gap: 12px; }
.group-back {
  font-size: .72rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase;
  color: var(--accent); border: 1px solid var(--border);
  padding: 4px 10px; border-radius: 6px; transition: all .2s; white-space: nowrap;
}
.group-back:hover { border-color: var(--accent); background: var(--accent-light); }
.nav-logo { display: flex; align-items: center; gap: 10px; }
.logo-icon-gold { width: 32px; height: 32px; display: flex; align-items: center; justify-content: center; font-size: 1.1rem; color: var(--accent); }
.logo-text { font-family: 'Playfair Display', serif; font-size: 1.1rem; font-weight: 700; color: var(--accent); }
.nav-links { display: flex; align-items: center; gap: 2px; }
.nav-links a { font-size: .85rem; font-weight: 500; color: var(--text-muted); padding: 6px 12px; border-radius: 6px; transition: all .2s; white-space: nowrap; }
.nav-links a:hover, .nav-links a.active { color: var(--accent); }
.nav-links a.active { font-weight: 600; }
.nav-actions { display: flex; align-items: center; gap: 8px; }
.icon-btn { width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; border-radius: 8px; border: 1px solid var(--border); background: none; cursor: pointer; color: var(--text-muted); transition: all .2s; font-size: .95rem; }
.icon-btn:hover { border-color: var(--accent); color: var(--accent); }
.btn-outline-nav { font-size: .83rem; font-weight: 600; color: var(--text-main); border: 1px solid var(--border); padding: 7px 14px; border-radius: 8px; transition: all .2s; }
.btn-outline-nav:hover { border-color: var(--primary); background: var(--gray-50); }
.btn-solid-nav { font-size: .83rem; font-weight: 600; color: #fff; background: var(--primary-dark); padding: 7px 14px; border-radius: 8px; transition: all .2s; }
[data-theme="dark"] .btn-solid-nav { background: var(--gray-100); color: var(--bg-body); }
.btn-solid-nav:hover { opacity: .85; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text-main); border-radius: 2px; transition: .3s; }

/* ═══ HERO ═══ */
.hero-c { background: var(--bg-body); padding: 72px 0 56px; text-align: center; border-bottom: 1px solid var(--border); }
.hero-title { font-family: 'Playfair Display', serif; font-size: clamp(1.9rem, 4.5vw, 3rem); font-weight: 700; font-style: italic; color: var(--text-main); margin-bottom: 16px; line-height: 1.25; }
.hero-desc { font-size: 1rem; color: var(--text-muted); max-width: 620px; margin: 0 auto 32px; line-height: 1.7; }
.hero-badges { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }
.hero-badge { display: flex; align-items: center; gap: 8px; background: var(--bg-alt); border: 1px solid var(--border); padding: 9px 16px; border-radius: 100px; font-size: .82rem; font-weight: 500; color: var(--text-body); }

/* ═══ SECTION ═══ */
.section-c { padding: 72px 0; }
.section-alt { background: var(--bg-alt); }
.section-label { font-size: .75rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); margin-bottom: 10px; display: block; }
.section-title { font-family: 'Playfair Display', serif; font-size: clamp(1.7rem, 3.5vw, 2.4rem); font-weight: 700; color: var(--text-main); margin-bottom: 16px; line-height: 1.25; }
.section-desc { font-size: 1rem; color: var(--text-muted); max-width: 600px; line-height: 1.75; }
.section-header { margin-bottom: 48px; }
.section-header.center { text-align: center; }
.section-header.center .section-desc { margin: 0 auto; }

/* ═══ CARDS ═══ */
.cards-grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.cards-grid-2 { display: grid; grid-template-columns: repeat(2,1fr); gap: 24px; }
.info-card {
  background: var(--bg-body); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px; box-shadow: var(--shadow); transition: transform .2s, box-shadow .2s;
}
.info-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.info-card-icon { font-size: 2rem; margin-bottom: 16px; }
.info-card h3 { font-family: 'Playfair Display', serif; font-size: 1.05rem; font-weight: 700; color: var(--text-main); margin-bottom: 10px; }
.info-card p { font-size: .88rem; color: var(--text-muted); line-height: 1.7; }

/* Publication card */
.pub-item {
  background: var(--bg-body); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 32px; display: flex; gap: 20px; align-items: flex-start;
  box-shadow: var(--shadow); transition: transform .2s, box-shadow .2s; margin-bottom: 16px;
}
.pub-item:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.pub-icon { font-size: 1.8rem; min-width: 44px; }
.pub-meta { flex: 1; }
.pub-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.tag-sm { font-size: .7rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; padding: 3px 9px; border-radius: 100px; }
.tag-articulo { background: rgba(59,130,246,.12); color: #1d4ed8; }
.tag-manual { background: rgba(139,92,246,.12); color: #6d28d9; }
.tag-informe { background: rgba(22,163,74,.12); color: #15803d; }
.tag-year { background: var(--bg-alt); color: var(--text-muted); border: 1px solid var(--border); }
.pub-title { font-family: 'Playfair Display', serif; font-size: 1rem; font-weight: 700; color: var(--text-main); margin-bottom: 6px; }
.pub-authors { font-size: .82rem; color: var(--text-muted); margin-bottom: 10px; }
.pub-summary { font-size: .88rem; color: var(--text-body); line-height: 1.65; }
.pub-actions { display: flex; gap: 10px; margin-top: 14px; }
.btn-sm { display: inline-flex; align-items: center; gap: 6px; padding: 7px 16px; font-size: .8rem; font-weight: 600; border-radius: 7px; transition: all .2s; cursor: pointer; border: none; font-family: 'Inter', sans-serif; }
.btn-sm-gold { background: var(--accent); color: #fff; }
.btn-sm-gold:hover { background: var(--accent-hover); transform: translateY(-1px); }
.btn-sm-outline { background: none; border: 1px solid var(--border); color: var(--text-body); }
.btn-sm-outline:hover { border-color: var(--accent); color: var(--accent); }

/* Filter bar */
.filter-bar-c {
  display: flex; gap: 12px; flex-wrap: wrap; align-items: center;
  background: var(--bg-body); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px 24px; margin-bottom: 40px; box-shadow: var(--shadow);
}
.filter-search-c { position: relative; flex: 1; min-width: 180px; }
.filter-search-c input {
  width: 100%; padding: 8px 14px 8px 36px; border: 1px solid var(--border); border-radius: 8px;
  font-size: .87rem; color: var(--text-main); background: var(--bg-body); font-family: 'Inter', sans-serif;
}
.filter-search-c input:focus { outline: none; border-color: var(--accent); }
.filter-search-c::before { content: '🔍'; position: absolute; left: 11px; top: 50%; transform: translateY(-50%); font-size: .82rem; }
.filter-select-c {
  padding: 8px 28px 8px 12px; border: 1px solid var(--border); border-radius: 8px;
  font-size: .87rem; color: var(--text-main); background: var(--bg-body); cursor: pointer;
  font-family: 'Inter', sans-serif; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='11' height='11' fill='%23888' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14L2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 9px center;
}
.filter-select-c:focus { outline: none; border-color: var(--accent); }
.btn-fc { padding: 8px 18px; border-radius: 8px; background: #1A1A1A; color: #fff; font-size: .84rem; font-weight: 600; cursor: pointer; border: none; transition: opacity .2s; }
.btn-fc:hover { opacity: .85; }
.btn-fc-clear { padding: 8px 14px; border: 1px solid var(--border); border-radius: 8px; background: none; color: var(--text-muted); font-size: .84rem; cursor: pointer; transition: all .2s; }
.btn-fc-clear:hover { border-color: var(--text-muted); color: var(--text-main); }

/* Buttons */
.btn-gold { display: inline-flex; align-items: center; gap: 8px; background: var(--accent); color: #fff; font-size: .93rem; font-weight: 700; padding: 12px 26px; border-radius: 8px; transition: all .25s; font-family: 'Inter', sans-serif; }
.btn-gold:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(200,149,46,.3); }
.btn-outline-gold { display: inline-flex; align-items: center; gap: 8px; background: none; color: var(--accent); border: 1.5px solid var(--accent); font-size: .9rem; font-weight: 600; padding: 10px 22px; border-radius: 8px; transition: all .2s; }
.btn-outline-gold:hover { background: var(--accent-light); transform: translateY(-2px); }
.btn-black { display: inline-flex; align-items: center; gap: 8px; background: #1A1A1A; color: #fff; font-size: .9rem; font-weight: 600; padding: 11px 24px; border-radius: 8px; transition: all .2s; }
.btn-black:hover { background: var(--accent); transform: translateY(-1px); }
[data-theme="dark"] .btn-black { background: var(--gray-100); color: var(--bg-body); }

/* CTA strip */
.cta-strip { background: linear-gradient(135deg, #1e2533, #111); padding: 72px 0; text-align: center; color: #fff; }
.cta-strip h2 { font-family: 'Playfair Display', serif; font-size: clamp(1.7rem,3.5vw,2.5rem); font-weight: 700; margin-bottom: 14px; }
.cta-strip p { color: rgba(255,255,255,.65); font-size: 1rem; max-width: 480px; margin: 0 auto 32px; }

/* Footer */
.footer { background: #111111; color: rgba(255,255,255,.65); padding: 64px 0 0; }
.footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand p { font-size: .87rem; line-height: 1.8; color: rgba(255,255,255,.45); max-width: 280px; margin-top: 12px; }
.footer-logo { font-family: 'Playfair Display', serif; font-size: 1.15rem; font-weight: 700; color: var(--accent); display: flex; align-items: center; gap: 8px; }
.footer-col h4 { font-size: .85rem; font-weight: 700; color: #fff; margin-bottom: 18px; letter-spacing: .04em; text-transform: uppercase; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a { font-size: .84rem; color: rgba(255,255,255,.45); transition: color .2s; }
.footer-col ul li a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.08); padding: 20px 0; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.footer-bottom span { font-size: .78rem; color: rgba(255,255,255,.3); }

/* Chat flotante */
.chat-btn { position: fixed; bottom: 24px; right: 24px; z-index: 200; width: 52px; height: 52px; background: var(--accent); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.3rem; box-shadow: 0 4px 20px rgba(200,149,46,.4); cursor: pointer; border: none; transition: transform .2s, box-shadow .2s; }
.chat-btn:hover { transform: scale(1.08); box-shadow: 0 8px 28px rgba(200,149,46,.5); }

/* Fade-in */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity .55s ease, transform .55s ease; }
.fade-in.visible { opacity: 1; transform: none; }
.fade-in.d1 { transition-delay: .1s; }
.fade-in.d2 { transition-delay: .2s; }
.fade-in.d3 { transition-delay: .3s; }

/* Forms */
.form-group-c { display: flex; flex-direction: column; gap: 6px; }
.form-group-c label { font-size: .82rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; color: var(--text-body); }
.form-group-c input, .form-group-c textarea, .form-group-c select {
  padding: 10px 14px; border: 1px solid var(--border); border-radius: 8px;
  font-size: .9rem; color: var(--text-main); font-family: 'Inter', sans-serif;
  background: var(--bg-body); transition: border-color .2s;
}
.form-group-c input:focus, .form-group-c textarea:focus, .form-group-c select:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(200,149,46,.1);
}
.form-group-c textarea { min-height: 110px; resize: vertical; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-grid .span-2 { grid-column: 1 / -1; }

/* Responsive */
@media (max-width: 1024px) {
  .cards-grid-3 { grid-template-columns: 1fr 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav-links, .nav-actions { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.open {
    display: flex; flex-direction: column; position: fixed;
    top: 64px; left: 0; right: 0; background: var(--bg-body);
    padding: 20px 24px; gap: 4px;
    border-bottom: 1px solid var(--border); box-shadow: 0 4px 16px rgba(0,0,0,.08);
  }
  .nav-links.open a { display: block; padding: 10px 12px; }
  .cards-grid-3, .cards-grid-2 { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .form-grid { grid-template-columns: 1fr; }
  .form-grid .span-2 { grid-column: 1; }
  .group-back { display: none; }
  .pub-item { flex-direction: column; }
}