:root{
  --navy: #142238;
  --navy-deep: #0d1728;
  --ink: #1b2a41;
  --paper: #f6f2e8;
  --paper-card: #fffdf7;
  --gold: #e8a43b;
  --gold-deep: #b97e22;
  --slate: #6c7889;
  --slate-light: #a9b2bf;
  --line: #dcd5c5;
  --line-dark: #2a3a54;
  --radius: 6px;
  --font-display: "Source Serif 4", Georgia, serif;
  --font-body: "Inter", -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--paper);
  line-height:1.6;
}
button{font-family:inherit;cursor:pointer;}
h1,h2,h3{font-family:var(--font-display);margin:0;}
p{margin:0;}

/* HEADER */
.site-header{
  position:sticky;top:0;z-index:40;
  background:var(--paper);
  border-bottom:1px solid var(--line);
}
.header-inner{
  max-width:1180px;margin:0 auto;padding:14px 28px;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
}
.brand{display:flex;align-items:center;gap:12px;}
.brand-mark{
  width:38px;height:38px;border-radius:50%;
  background:var(--navy);color:var(--gold);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-mono);font-weight:600;font-size:14px;
  flex-shrink:0;
}
.brand-mark.small{width:32px;height:32px;font-size:12px;}
.brand-text{display:flex;flex-direction:column;line-height:1.25;}
.brand-line1{font-family:var(--font-display);font-weight:600;font-size:16px;color:var(--ink);}
.brand-line2{font-size:11px;letter-spacing:.04em;color:var(--slate);text-transform:uppercase;}

.main-nav{display:flex;gap:6px;}
.nav-link{
  background:none;border:1px solid transparent;color:var(--ink);
  font-size:13px;font-weight:600;letter-spacing:.03em;text-transform:uppercase;
  padding:9px 16px;border-radius:var(--radius);
}
.nav-link:hover{background:var(--navy);color:#fff;}

.menu-toggle{display:none;background:none;border:none;padding:8px;flex-direction:column;gap:4px;}
.menu-toggle span{width:22px;height:2px;background:var(--ink);display:block;}

/* HERO */
.hero{
  position:relative;
  min-height:520px;
  display:flex;align-items:flex-end;
  background:
    linear-gradient(180deg, rgba(13,23,40,.35) 0%, rgba(13,23,40,.55) 55%, rgba(13,23,40,.92) 100%),
    linear-gradient(120deg, #24344f, #0d1728 70%);
  padding:0;
}
.hero-content{
  position:relative;z-index:2;
  max-width:1180px;margin:0 auto;width:100%;
  padding:64px 28px 56px;
  color:#fff;
}
.hero-eyebrow{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--gold);margin-bottom:16px;
}
.hero-title{
  font-size:clamp(44px, 8vw, 84px);
  font-weight:700;
  letter-spacing:-.01em;
  margin-bottom:20px;
  text-transform:uppercase;
}
.hero-sub{
  max-width:560px;font-size:16px;color:#e7e9ee;margin-bottom:28px;
}
.hero-links{display:flex;gap:10px;}
.hero-link{
  background:transparent;border:1px solid rgba(255,255,255,.45);color:#fff;
  padding:10px 20px;border-radius:var(--radius);font-size:13px;font-weight:600;
  text-transform:uppercase;letter-spacing:.03em;
}
.hero-link:hover{background:#fff;color:var(--navy-deep);border-color:#fff;}

/* MODAL */
.modal-layer{
  position:fixed;inset:0;z-index:80;
  background:rgba(13,23,40,.7);
  display:flex;align-items:center;justify-content:center;
  padding:24px;
}
.modal-layer[hidden]{
  display:none;
}
.modal-card{
  background:var(--paper-card);max-width:560px;width:100%;
  border-radius:8px;padding:36px 32px 32px;
  position:relative;max-height:82vh;overflow-y:auto;
  border-top:4px solid var(--gold);
}
.modal-close{
  position:absolute;top:14px;right:16px;
  background:none;border:none;font-size:22px;color:var(--slate);
  line-height:1;padding:4px;
}
.modal-close:hover{color:var(--ink);}
.modal-body-eyebrow{font-family:var(--font-mono);font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--gold-deep);margin-bottom:8px;display:block;}
.modal-body-title{font-size:26px;margin-bottom:14px;}
.modal-body-meta{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px;}
.modal-body-text{color:var(--slate);font-size:14.5px;margin-bottom:20px;}
.modal-res-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--line);}
.modal-res-list li{
  padding:12px 0;border-bottom:1px solid var(--line);
  display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:14px;
}
.modal-res-tag{
  font-family:var(--font-mono);font-size:10.5px;color:var(--gold-deep);
  background:#fbeed6;padding:3px 8px;border-radius:3px;flex-shrink:0;
}

/* TOOLBAR */
.toolbar-section{max-width:1180px;margin:0 auto;padding:36px 28px 4px;}
.toolbar{display:flex;gap:14px;flex-wrap:wrap;}
.search-wrap{flex:1;min-width:240px;}
#searchInput{
  width:100%;padding:13px 16px;border:1px solid var(--line);border-radius:var(--radius);
  font-size:14px;background:var(--paper-card);color:var(--ink);
}
#searchInput:focus{outline:2px solid var(--gold);outline-offset:1px;}
.filter-wrap{display:flex;align-items:center;gap:8px;}
.filter-wrap label{font-size:12px;color:var(--slate);text-transform:uppercase;letter-spacing:.04em;}
#typeFilter{
  padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--paper-card);font-size:14px;color:var(--ink);
}
.search-status{margin-top:10px;font-size:13px;color:var(--slate);}

/* SECTIONS */
.section{padding:64px 0;}
.section-inner{max-width:1180px;margin:0 auto;padding:0 28px;}
.section-eyebrow{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--gold-deep);margin-bottom:10px;
}
.section-dark .section-eyebrow, .section-navy .section-eyebrow{color:var(--gold);}
.section-title{font-size:clamp(28px,4vw,40px);margin-bottom:14px;}
.section-lede{max-width:640px;color:var(--slate);font-size:15.5px;margin-bottom:40px;}

.section-paper{background:var(--paper);}
.section-dark{background:var(--navy-deep);color:#f2efe6;}
.section-dark .section-lede{color:var(--slate-light);}
.section-navy{background:var(--navy);color:#f2efe6;}
.section-navy .section-lede{color:var(--slate-light);}

/* CORE GRID (ejes troncales) */
.core-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.core-card{
  background:var(--ink);border:1px solid var(--line-dark);border-radius:8px;
  padding:26px 24px;position:relative;overflow:hidden;
  transition:transform .18s ease, border-color .18s ease;
  text-align:left;
}
.core-card:hover{transform:translateY(-3px);border-color:var(--gold);}
.core-card-tab{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.05em;
  color:var(--gold);text-transform:uppercase;margin-bottom:16px;display:block;
}
.core-card-title{font-size:21px;color:#fff;margin-bottom:10px;}
.core-card-desc{font-size:13.5px;color:var(--slate-light);margin-bottom:20px;}
.core-card-cta{
  font-family:var(--font-mono);font-size:12px;color:var(--gold);
  display:inline-flex;align-items:center;gap:6px;
}

/* GROUP TABS (Cursos IB) */
.group-tabs{
  display:flex;gap:8px;flex-wrap:wrap;margin-bottom:32px;
  border-bottom:1px solid var(--line);padding-bottom:0;
}
.group-tab{
  background:transparent;border:1px solid var(--line);border-bottom:none;
  padding:10px 16px 12px;font-size:13px;font-weight:600;color:var(--slate);
  border-radius:6px 6px 0 0;position:relative;top:1px;
}
.group-tab.active{
  background:var(--paper-card);color:var(--ink);border-color:var(--line);
  border-bottom:1px solid var(--paper-card);
}
.group-tab .tab-num{font-family:var(--font-mono);color:var(--gold-deep);margin-right:6px;}

.subject-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;}
.subject-card{
  background:var(--paper-card);border:1px solid var(--line);border-radius:8px;
  padding:20px;text-align:left;position:relative;
  transition:border-color .15s ease, transform .15s ease;
}
.subject-card:hover{border-color:var(--gold-deep);transform:translateY(-2px);}
.subject-card-name{font-size:16px;font-weight:600;margin-bottom:10px;display:block;color:var(--ink);}
.subject-badges{display:flex;gap:6px;}
.badge{
  font-family:var(--font-mono);font-size:10.5px;font-weight:600;
  padding:3px 8px;border-radius:3px;letter-spacing:.03em;
}
.badge-sl{background:#e6eef7;color:#2d5985;}
.badge-hl{background:#fbeed6;color:var(--gold-deep);}
.subject-card-count{
  position:absolute;top:18px;right:18px;font-family:var(--font-mono);
  font-size:11px;color:var(--slate);
}

.empty-state{
  padding:40px 20px;text-align:center;color:var(--slate);font-size:14px;
  border:1px dashed var(--line);border-radius:8px;grid-column:1 / -1;
}

/* CAS */
.cas-inner{text-align:left;}
.ghost-btn{
  background:transparent;border:1px solid var(--gold);color:var(--gold);
  padding:12px 22px;border-radius:var(--radius);font-size:13px;font-weight:600;
  text-transform:uppercase;letter-spacing:.03em;
}
.ghost-btn:hover{background:var(--gold);color:var(--navy-deep);}

/* FOOTER */
.site-footer{background:var(--navy-deep);color:var(--slate-light);padding:40px 0;}
.footer-inner{
  max-width:1180px;margin:0 auto;padding:0 28px;
  display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;
}
.footer-brand{display:flex;gap:12px;max-width:440px;}
.footer-title{color:#fff;font-weight:600;font-size:14px;margin-bottom:6px;}
.footer-sub{font-size:12.5px;line-height:1.6;}
.footer-note{font-size:12px;max-width:280px;color:var(--slate);}

/* RESPONSIVE */
@media (max-width: 860px){
  .main-nav{display:none;}
  .menu-toggle{display:flex;}
  .core-grid{grid-template-columns:1fr;}
  .hero{min-height:440px;}
}
@media (max-width: 560px){
  .header-inner{padding:12px 18px;}
  .section-inner, .toolbar-section{padding-left:18px;padding-right:18px;}
  .hero-content{padding:44px 18px 40px;}
  .footer-inner{flex-direction:column;}
}