:root {
  --blue:       #0488C6;
  --blue-dark:  #0370a3;
  --blue-dim:   rgba(4,136,198,0.10);
  --blue-pale:  #e8f4fb;
  --black:      #131217;
  --white:      #ffffff;
  --off-white:  #f5f6f8;
  --grey:       #6b7280;
  --grey-light: #e5e7eb;
  --border:     #d1d9e0;
  --font-main:  'Barlow', sans-serif;
  --font-cond:  'Barlow Condensed', sans-serif;
  --header-h:   72px;
  --logo-w:     153px;
  --logo-h:     45px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
[id] { scroll-margin-top: calc(var(--header-h) + 20px); }

body {
  background: var(--off-white);
  color: var(--black);
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.65;
}

/* ── HEADER ── */
header {
  height: var(--header-h);
  background: var(--black);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(0,0,0,0.4);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.header-left { display: flex; align-items: center; gap: 1.5rem; }

/* Logo: tamaño fijo 153×45 en todas las páginas */
.logo-slot {
  width: var(--logo-w);
  height: var(--logo-h);
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.logo-slot img {
  width: var(--logo-w);
  height: var(--logo-h);
  object-fit: contain;
  object-position: left center;
  display: block;
}

.hdivider { width: 1px; height: 28px; background: rgba(255,255,255,0.16); flex-shrink: 0; }

.header-title h1 {
  font-family: var(--font-cond);
  font-size: 1rem;
  font-weight: 600;
  color: var(--white);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  line-height: 1.2;
}

.header-title p {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.38);
  font-weight: 300;
  margin-top: 0.1rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: rgba(255,255,255,0.42);
  font-family: var(--font-cond);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  transition: color 0.15s;
  flex-shrink: 0;
}
.back-link:hover { color: var(--white); }
.back-link svg { width: 14px; height: 14px; }

/* ── HERO (subpáginas) ── */
.hero {
  background: linear-gradient(135deg, var(--black) 0%, #1a1a2e 100%);
  border-bottom: 4px solid var(--blue);
  padding: 2.25rem 0;
}

.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.hero-icon {
  width: 52px;
  height: 52px;
  background: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.hero-icon svg { width: 24px; height: 24px; color: white; }

.hero-text h2 {
  font-family: var(--font-cond);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.hero-text p {
  font-size: 0.87rem;
  color: rgba(255,255,255,0.45);
  margin-top: 0.2rem;
  font-weight: 300;
}

/* ── MAIN ── */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.75rem 2.5rem 7rem;
}

/* ── TOC ── */
.toc {
  background: var(--white);
  border: 1px solid var(--border);
  border-top: 4px solid var(--blue);
  margin-bottom: 2.75rem;
  padding: 1.75rem 2rem;
}

.toc-title {
  font-family: var(--font-cond);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--grey);
  text-transform: uppercase;
  margin-bottom: 1.1rem;
}

.toc-grid { display: grid; gap: 0.65rem; }

.toc-item {
  display: block;
  text-decoration: none;
  background: var(--off-white);
  border: 1px solid var(--border);
  border-left: 3px solid var(--grey-light);
  padding: 0.9rem 1.1rem;
  transition: all 0.15s;
}
.toc-item:hover { border-left-color: var(--blue); background: var(--white); box-shadow: 0 2px 8px rgba(0,0,0,0.07); }
.toc-num { font-family: var(--font-cond); font-size: 0.65rem; font-weight: 700; letter-spacing: 0.14em; color: var(--blue); text-transform: uppercase; margin-bottom: 0.2rem; }
.toc-label { font-size: 0.85rem; font-weight: 600; color: var(--black); line-height: 1.3; }
.toc-sub { font-size: 0.73rem; color: var(--grey); margin-top: 0.15rem; font-weight: 300; }

/* ── EXERCISE CARD ── */
.exercise {
  background: var(--white);
  border: 1px solid var(--border);
  margin-bottom: 2rem;
  overflow: hidden;
}

.exercise-header {
  background: var(--black);
  padding: 1.25rem 1.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.ex-left { display: flex; align-items: center; gap: 1rem; }
.ex-num {
  background: var(--blue);
  color: var(--white);
  font-family: var(--font-cond);
  font-size: 1rem;
  font-weight: 700;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.ex-title {
  font-family: var(--font-cond);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--white);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.ex-subtitle {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.38);
  margin-top: 0.12rem;
  font-weight: 300;
}
.tool-badge {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.5);
  font-family: var(--font-cond);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  padding: 0.25rem 0.75rem;
  text-transform: uppercase;
  white-space: nowrap;
  flex-shrink: 0;
}

.exercise-body { padding: 1.75rem; }

/* ── DOCS ── */
.docs-section { margin-bottom: 1.5rem; }
.docs-label {
  font-family: var(--font-cond);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--grey);
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}
.docs-grid { display: flex; flex-wrap: wrap; gap: 0.6rem; }

.doc-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--off-white);
  border: 1px solid var(--border);
  border-left: 3px solid var(--grey);
  padding: 0.6rem 1rem;
  text-decoration: none;
  color: var(--black);
  font-size: 0.83rem;
  font-weight: 500;
  transition: all 0.15s;
}
.doc-link:hover { background: var(--blue); color: var(--white); border-color: var(--blue); }
.doc-link svg { width: 13px; height: 13px; flex-shrink: 0; }
.doc-link.docx { border-left-color: #2b579a; }
.doc-link.pptx { border-left-color: #c43e1c; }
.doc-link.xlsx { border-left-color: #217346; }

/* ── PROMPT GROUP ── */
.prompt-group-label {
  font-family: var(--font-cond);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--grey);
  text-transform: uppercase;
  margin-bottom: 0.6rem;
  margin-top: 1.5rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.prompt-group-label.first { margin-top: 0; padding-top: 0; border-top: none; }

.pg-num {
  background: var(--blue);
  color: white;
  font-family: var(--font-cond);
  font-size: 0.62rem;
  font-weight: 700;
  width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* ── PROMPT BOX ── */
.prompt-item { margin-bottom: 0.6rem; }
.prompt-item:last-child { margin-bottom: 0; }

.prompt-box { border: 1px solid var(--border); background: var(--off-white); overflow: hidden; }
.prompt-text {
  padding: 1.1rem 1.3rem;
  font-size: 0.88rem;
  color: var(--black);
  white-space: pre-wrap;
  line-height: 1.68;
}
.prompt-footer {
  border-top: 1px solid var(--border);
  padding: 0.45rem 1rem;
  display: flex;
  justify-content: flex-end;
  background: var(--white);
}

/* ── COPY BTN ── */
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: none;
  border: 1px solid var(--border);
  color: var(--grey);
  font-family: var(--font-cond);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  padding: 0.28rem 0.75rem;
  cursor: pointer;
  transition: all 0.15s;
  text-transform: uppercase;
}
.copy-btn:hover { background: var(--blue); border-color: var(--blue); color: white; }
.copy-btn.copied { background: var(--blue-dark); border-color: var(--blue-dark); color: white; }
.copy-btn svg { width: 11px; height: 11px; }

/* ── INFO NOTE ── */
.info-note {
  background: var(--blue-pale);
  border: 1px solid #b3d9ef;
  border-left: 3px solid var(--blue);
  padding: 0.85rem 1.1rem 0.85rem 2.75rem;
  font-size: 0.85rem;
  color: var(--black);
  margin-bottom: 1.4rem;
  display: block;
  line-height: 1.58;
  position: relative;
}
.info-note svg {
  position: absolute;
  left: 0.95rem;
  top: 0.95rem;
  width: 14px;
  height: 14px;
  color: var(--blue);
}

/* ── PROMPT VARIANT LABEL ── */
.variant-label {
  font-family: var(--font-cond);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--blue-dark);
  text-transform: uppercase;
  background: var(--blue-pale);
  border: 1px solid #b3d9ef;
  border-left: 3px solid var(--blue);
  padding: 0.4rem 0.85rem;
  margin-bottom: 0.5rem;
  display: inline-block;
}

/* ── FOOTER ── */
footer {
  background: var(--black);
  border-top: 4px solid var(--blue);
  padding: 1.75rem 2.5rem;
  text-align: center;
}
footer p {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.26);
  font-family: var(--font-cond);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ── RESPONSIVE ── */
@media (max-width: 640px) {
  .header-inner { padding: 0 1.25rem; gap: 1rem; }
  main { padding: 1.5rem 1.25rem 5rem; }
  .hero-inner { padding: 0 1.25rem; }
  .exercise-header { padding: 1rem 1.25rem; }
  .exercise-body { padding: 1.25rem; }
  .tool-badge { display: none; }
  .toc { padding: 1.25rem; }
}