/* ==========================================================
   EVIDENTIA — Sistema de diseño "Instituto"
   Inspirado en la sobriedad de institutos científicos alemanes
   (autoridad vía datos, grillas de programas, azul institucional)
   Paleta: azul institucional + gris papel + acento óxido
   Tipografía: Archivo (display) / IBM Plex Sans (cuerpo) / IBM Plex Mono (datos)
   ========================================================== */

:root {
  --blue-deep: #0B2E4E;
  --blue: #0059A3;
  --blue-soft: #E7EEF3;
  --paper: #F5F6F7;
  --white: #FFFFFF;
  --ink: #12202C;
  --ink-soft: #48545E;
  --line: #D9DEE2;
  --accent: #B5482E;

  --font-display: "Archivo", sans-serif;
  --font-body: "IBM Plex Sans", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --wrap: 1180px;
  --radius: 2px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
h1, h2, h3 { font-family: var(--font-display); color: var(--ink); margin: 0; letter-spacing: -0.01em; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 32px;
}
.narrow { max-width: 760px; }

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

/* ---------- HEADER ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(245, 246, 247, 0.92);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--blue-deep);
}
.nav {
  display: flex;
  align-items: center;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--ink-soft);
}
.nav a { margin-left: 28px; }
.nav a:hover { color: var(--blue); }
.nav-cta {
  padding: 9px 18px;
  background: var(--blue-deep);
  color: var(--white) !important;
  border-radius: var(--radius);
}
.nav-cta:hover { background: var(--blue); }

@media (max-width: 680px) {
  .nav a:not(.nav-cta) { display: none; }
  .nav a { margin-left: 0; }
}

/* ---------- BUTTONS ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 15px;
  border: 1.5px solid transparent;
  transition: all 0.18s ease;
}
.btn-primary { background: var(--blue-deep); color: var(--white); }
.btn-primary:hover { background: var(--blue); }
.btn-ghost { border-color: var(--blue-deep); color: var(--blue-deep); }
.btn-ghost:hover { background: var(--blue-soft); }
.btn-large { padding: 17px 34px; font-size: 16px; }

/* ---------- SECTION LABELS ---------- */
.eyebrow, .section-kicker {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
  display: block;
  margin-bottom: 14px;
}
.section-kicker.light { color: #9CC3E0; }

/* ---------- HERO ---------- */
.hero { padding: 88px 0 0; }
.hero .wrap { padding-bottom: 56px; }
.hero h1 {
  font-size: clamp(32px, 4.4vw, 50px);
  font-weight: 700;
  line-height: 1.14;
  margin: 4px 0 22px;
  max-width: 16ch;
}
.hero h1 .underline {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 4px;
  text-underline-offset: 6px;
}
.hero-lede {
  font-size: 18px;
  color: var(--ink-soft);
  max-width: 52ch;
  margin-bottom: 34px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* Signature element: institutional stat bar (Zahlen und Fakten) */
.stat-bar {
  background: var(--blue-deep);
  border-top: 1px solid rgba(255,255,255,0.08);
}
.stat-bar-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.stat-item {
  padding: 34px 24px;
  border-left: 1px solid rgba(255,255,255,0.14);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.stat-item:first-child { border-left: none; }
.stat-num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3vw, 38px);
  font-weight: 600;
  color: var(--white);
  line-height: 1;
}
.stat-label {
  font-size: 13px;
  color: #B7CBDC;
  line-height: 1.4;
}

@media (max-width: 800px) {
  .stat-bar-inner { grid-template-columns: repeat(2, 1fr); }
  .stat-item:nth-child(3) { border-left: none; }
  .stat-item:nth-child(2n) { border-left: 1px solid rgba(255,255,255,0.14); }
  .stat-item:nth-child(1), .stat-item:nth-child(3) { border-left: none; }
}

/* ---------- PROBLEM ---------- */
.problem { padding: 88px 0; }
.statement {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(21px, 2.4vw, 27px);
  line-height: 1.5;
  color: var(--ink);
  border-left: 3px solid var(--accent);
  padding-left: 28px;
}

/* ---------- APPROACH ---------- */
.approach { padding: 80px 0; background: var(--white); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.approach-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 64px;
}
.approach-copy h2 {
  font-size: clamp(25px, 2.8vw, 34px);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 16px;
}
.approach-copy p { color: var(--ink-soft); font-size: 16.5px; max-width: 50ch; }
.approach-points { display: flex; flex-direction: column; gap: 20px; }
.approach-points li {
  font-size: 15.5px;
  color: var(--ink);
  border-top: 1px solid var(--line);
  padding: 16px 0 0;
  display: flex;
  align-items: baseline;
  gap: 14px;
}
.pt-code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--blue);
  flex-shrink: 0;
}

@media (max-width: 860px) {
  .approach-grid { grid-template-columns: 1fr; }
}

/* ---------- PROGRAMS ---------- */
.programs { padding: 88px 0; }
.programs-title {
  font-size: clamp(23px, 2.6vw, 30px);
  font-weight: 700;
  margin: 0 0 44px;
  max-width: 32ch;
}

.program-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.program-card {
  background: var(--white);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  border-top: 3px solid transparent;
  transition: border-color 0.18s ease;
}
.program-card:hover { border-top-color: var(--blue); }
.program-card-wide { grid-column: span 1; }
.program-code {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.06em;
}
.program-card h3 { font-size: 17px; font-weight: 600; font-family: var(--font-body); }
.program-card p { font-size: 14.5px; color: var(--ink-soft); line-height: 1.55; }

@media (max-width: 900px) {
  .program-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .program-grid { grid-template-columns: 1fr; }
}

/* ---------- EVIDENCE / TRAYECTORIA ---------- */
.evidence { padding: 88px 0; background: var(--blue-deep); color: var(--paper); }
.evidence-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 56px;
  align-items: start;
}
.evidence-copy h2 {
  color: var(--white);
  font-size: clamp(25px, 2.8vw, 34px);
  font-weight: 700;
  margin: 0 0 18px;
  line-height: 1.25;
}
.evidence-copy p { color: #C2D3E0; font-size: 16.5px; max-width: 54ch; }
.evidence-copy strong { color: var(--white); }

.milestone-list {
  margin-top: 30px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.milestone-list li {
  font-size: 15px;
  color: #C2D3E0;
  line-height: 1.55;
  border-top: 1px solid rgba(255,255,255,0.16);
  padding-top: 14px;
  display: flex;
  gap: 14px;
  align-items: baseline;
}
.milestone-list .pt-code { color: #9CC3E0; }

.evidence-panel {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.16);
  padding: 26px 24px;
  border-radius: var(--radius);
}
.evidence-panel-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #9CC3E0;
  margin-bottom: 12px;
}
.evidence-panel-text { font-size: 14.5px; color: #C2D3E0; line-height: 1.55; margin-bottom: 18px; }
.evidence-panel-link { font-size: 14px; font-weight: 600; color: var(--white); border-bottom: 1px solid var(--accent); padding-bottom: 2px; }

@media (max-width: 860px) {
  .evidence-grid { grid-template-columns: 1fr; }
}

/* ---------- PARTNERS / COLABORACIONES ---------- */
.partners { padding: 88px 0; background: var(--white); border-top: 1px solid var(--line); }

.partners-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: 44px;
}
.partner-group { background: var(--white); padding: 28px 24px; }
.partner-group h3 {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blue);
  margin: 0 0 16px;
}
.partner-list { display: flex; flex-direction: column; gap: 10px; }
.partner-list li { font-size: 15px; font-weight: 600; color: var(--ink); }

@media (max-width: 900px) {
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .partners-grid { grid-template-columns: 1fr; }
}

/* ---------- CTA ---------- */
.cta { padding: 100px 0; text-align: center; background: var(--paper); border-top: 1px solid var(--line); }
.cta-inner { max-width: 640px; margin: 0 auto; }
.cta .section-kicker { color: var(--blue); }
.cta h2 {
  color: var(--ink);
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  margin: 0 0 16px;
  line-height: 1.2;
}
.cta-lede { color: var(--ink-soft); font-size: 17px; margin-bottom: 32px; }

/* ---------- FOOTER ---------- */
.site-footer { padding: 26px 0; border-top: 1px solid var(--line); background: var(--white); }
.footer-row {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--ink-soft);
}