/* ============================================
   PROFE ALEXIAI - Clase 08: Tu nuevo workflow
   Mobile-first · Dark theme · Vanilla CSS
   ============================================ */

:root {
  --negro:       #0a0a0a;
  --negro-2:     #111111;
  --negro-3:     #1a1a1a;
  --magenta:     #D91A8A;
  --magenta-2:   #F472B6;
  --cyan-tech:   #5EEAD4;
  --naranja-meta:#FBBF24;
  --blanco:      #FFFFFF;
  --gris-1:      #E5E7EB;
  --gris-2:      #9CA3AF;
  --gris-3:      #374151;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  background: var(--negro);
  color: var(--blanco);
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 400;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--magenta); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--magenta-2); }
strong, b { font-weight: 600; }
::selection { background: var(--magenta); color: var(--blanco); }
:focus-visible { outline: 2px solid var(--magenta); outline-offset: 3px; }

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}
@media (min-width: 768px) { .container { padding: 0 2rem; } }
@media (min-width: 1024px) { .container { padding: 0 3rem; } }

/* ============================================
   HERO
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 6rem 1.25rem 4rem;
  position: relative;
}
@media (min-width: 768px) { .hero { padding: 6rem 2rem 4rem; } }
@media (min-width: 1024px) { .hero { padding: 8rem 3rem 5rem; max-width: 1200px; margin: 0 auto; } }

.hero__label {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--magenta);
  margin-bottom: 1.5rem;
  display: block;
}

.hero__title {
  font-family: 'Clash Display', sans-serif;
  font-weight: 700;
  font-size: clamp(2.75rem, 8vw, 7rem);
  letter-spacing: -0.02em;
  line-height: 0.95;
  color: var(--blanco);
  margin-bottom: 1.5rem;
  max-width: 900px;
}

.hero__subtitle {
  font-size: 1.05rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.7);
  max-width: 680px;
  margin-bottom: 2.5rem;
}
@media (min-width: 768px) { .hero__subtitle { font-size: 1.15rem; } }

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--magenta);
  color: var(--blanco);
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.85rem 1.75rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease-out, box-shadow 0.2s;
  text-decoration: none;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(217, 26, 138, 0.3);
  color: var(--blanco);
}

.link-secondary {
  font-size: 0.9rem;
  color: var(--gris-2);
  text-decoration: none;
  transition: color 0.2s;
}
.link-secondary:hover { color: var(--gris-1); }

/* ============================================
   PROGRESS BAR
   ============================================ */
.progress-bar {
  position: fixed;
  top: 0; left: 0; width: 100%;
  z-index: 100;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  transform: translateY(-100%);
  transition: transform 0.3s ease;
  padding: 0;
}
.progress-bar.visible { transform: translateY(0); }
.progress-bar__track { height: 3px; background: var(--negro-3); position: relative; }
.progress-bar__fill { height: 100%; background: var(--magenta); width: 0%; transition: width 0.1s linear; }
.progress-bar__info {
  padding: 0.5rem 1.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--gris-2);
  text-transform: uppercase;
}
@media (min-width: 768px) { .progress-bar__info { padding: 0.5rem 2rem; } }

/* ============================================
   LESSON SECTIONS
   ============================================ */
.leccion {
  padding: 5rem 0;
  position: relative;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}
.leccion:first-of-type { border-top: none; }
@media (min-width: 768px) { .leccion { padding: 6rem 0; } }
@media (min-width: 1024px) { .leccion { padding: 8rem 0; } }

.leccion__header { position: relative; margin-bottom: 2.5rem; }

.leccion__numero {
  font-family: 'Clash Display', sans-serif;
  font-weight: 700;
  font-size: clamp(4rem, 12vw, 8rem);
  color: var(--magenta);
  opacity: 0.9;
  line-height: 1;
  letter-spacing: -0.03em;
  display: block;
  margin-bottom: 0.5rem;
}
@media (min-width: 1024px) {
  .leccion__numero {
    position: absolute; left: -1rem; top: -0.5rem;
    font-size: 9rem; opacity: 0.12; z-index: 0; margin-bottom: 0;
  }
  .leccion__header { padding-left: 0; position: relative; z-index: 1; }
}

.leccion__titulo {
  font-family: 'Clash Display', sans-serif;
  font-weight: 700;
  font-size: clamp(1.75rem, 4.5vw, 3.25rem);
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--blanco);
  margin-bottom: 1rem;
}

.leccion__intro {
  font-size: 1.05rem;
  color: var(--gris-1);
  line-height: 1.7;
  max-width: 700px;
}
@media (min-width: 768px) { .leccion__intro { font-size: 1.1rem; } }

/* --- Cards Grid --- */
.leccion__cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: 2.5rem;
}
@media (min-width: 1024px) {
  .leccion__cards { grid-template-columns: 1fr 1fr; gap: 1.5rem; }
}

/* Asymmetric height for L04 seven steps */
.leccion__cards--asymmetric {
  align-items: start;
}

.card {
  background: var(--negro-3);
  border: 1px solid var(--gris-3);
  border-radius: 12px;
  min-width: 0;
  padding: 1.75rem;
  position: relative;
  transition: border-color 0.25s;
}
@media (min-width: 768px) { .card { padding: 2rem 2.25rem; } }
.card:hover { border-color: #4b5563; }
.card--tecnico { border-top: 2px solid var(--cyan-tech); }
.card--paladino { border-top: 2px solid var(--naranja-meta); }

.card__label {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  display: inline-block;
  margin-bottom: 1rem;
}
.card--tecnico .card__label { color: var(--cyan-tech); }
.card--paladino .card__label { color: var(--naranja-meta); }

.card__content {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--gris-1);
}
.card__content p { margin-bottom: 1em; }
.card__content p:last-child { margin-bottom: 0; }
.card__content strong { color: var(--blanco); }

/* inline code */
.card__content code,
.leccion__intro code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.88em;
  background: var(--negro-2);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--magenta-2);
}

/* Note update (small date stamp) */
.note-update {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--gris-2);
  font-style: italic;
  margin-top: 0.25em;
}

/* ============================================
   FLOW SEQUENCE (L01 doble trabajo)
   ============================================ */
.flow-sequence {
  margin: 1em 0;
  padding: 0.75rem 1rem;
  background: var(--negro-2);
  border: 1px solid var(--gris-3);
  border-radius: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.flow-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--gris-1);
  background: var(--negro-3);
  border: 1px solid var(--gris-3);
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  flex-shrink: 0;
}

.flow-arrow {
  color: var(--magenta);
  opacity: 0.5;
  font-size: 0.85rem;
  flex-shrink: 0;
}

/* ============================================
   STEP ITEMS (L04 seven steps)
   ============================================ */
.step-item {
  margin-bottom: 1.25em;
}
.step-item:last-of-type {
  margin-bottom: 0;
}

.step-separator {
  border: none;
  border-top: 1px solid var(--gris-3);
  margin: 1.5em 0;
}

/* ============================================
   BLOCKQUOTE BRUTAL (quote final)
   ============================================ */
.quote-final {
  margin: 5rem 0 3rem;
  padding: 0;
}
@media (min-width: 768px) { .quote-final { margin: 7.5rem 0 4rem; } }

.quote-final__text {
  font-family: 'Clash Display', sans-serif;
  font-weight: 700;
  font-size: clamp(2rem, 4.5vw, 4.5rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--blanco);
  max-width: 800px;
}

.quote-final__line { display: block; }

.quote-final__rule {
  width: 50px;
  height: 2px;
  background: var(--magenta);
  border: none;
  margin-top: 2.5rem;
}
@media (min-width: 768px) { .quote-final__rule { margin-top: 3rem; } }

/* ============================================
   RESUMEN FINAL
   ============================================ */
.resumen-final {
  padding: 6rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}
@media (min-width: 1024px) { .resumen-final { padding: 8rem 0; } }

.resumen-final__titulo {
  font-family: 'Clash Display', sans-serif;
  font-weight: 700;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--blanco);
  margin-bottom: 2.5rem;
}

/* ============================================
   SITE FOOTER
   ============================================ */
.site-footer {
  padding: 3rem 0 1rem;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.site-footer__brand {
  font-family: 'Clash Display', sans-serif;
  font-weight: 600; font-size: 1rem;
  color: var(--gris-1); margin-bottom: 0.5rem;
}
.site-footer__note { font-size: 0.85rem; color: var(--gris-2); margin-bottom: 0.25rem; }
.site-footer__note a { color: var(--gris-2); text-decoration: underline; text-underline-offset: 2px; }
.site-footer__note a:hover { color: var(--gris-1); }

/* ============================================
   LINK UNDERLINE ANIMATION
   ============================================ */
.card__content a, .leccion__intro a { position: relative; color: var(--magenta); text-decoration: none; }
.card__content a::after, .leccion__intro a::after {
  content: ''; position: absolute; bottom: -1px; left: 0;
  width: 0; height: 1px; background: var(--magenta); transition: width 0.25s ease;
}
.card__content a:hover::after, .leccion__intro a:hover::after { width: 100%; }

/* ============================================
   GSAP / REDUCED MOTION / PRINT
   ============================================ */
.anim-fade-up { opacity: 0; transform: translateY(20px); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .anim-fade-up { opacity: 1; transform: none; }
}

@media print {
  body { background: #fff; color: #000; }
  .progress-bar, .hero__actions { display: none; }
  .card { break-inside: avoid; }
}

/* ============================================
   NAVBAR SUPERIOR
   ============================================ */
.navbar-top {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 50;
  padding: 1rem 1.25rem;
}
@media (min-width: 768px) { .navbar-top { padding: 1.25rem 2rem; } }
@media (min-width: 1024px) { .navbar-top { padding: 1.5rem 3rem; } }

.navbar-top__link {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 600;
  font-size: 0.8125rem;
  color: var(--gris-2);
  text-decoration: none;
  transition: color 0.2s;
  letter-spacing: 0.02em;
}
.navbar-top__link:hover { color: var(--magenta); }

/* ============================================
   NAV INTER-CLASES
   ============================================ */
.nav-clases {
  margin-top: 5rem;
  margin-bottom: 2.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--gris-3);
}

.nav-clases__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.nav-clases__link {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--gris-2);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-clases__link:hover { color: var(--magenta); }

.nav-clases__link--prev { text-align: left; }
.nav-clases__link--center { text-align: center; font-size: 0.8125rem; }
.nav-clases__link--next { text-align: right; }

.nav-clases__arrow { color: var(--magenta); }

.nav-titulo-largo { display: none; }
@media (min-width: 768px) { .nav-titulo-largo { display: inline; } }