/* =============================================
   VARIABLES
   ============================================= */
:root {
  --color-bg:           #ffffff;
  --color-bg-alt:       #f8fafc;
  --color-surface:      #ffffff;
  --color-border:       #e2e8f0;
  --color-text:         #1e293b;
  --color-text-muted:   #64748b;
  --color-accent:       #1d4ed8;
  --color-accent-hover: #1e40af;
  --color-accent-light: #eff6ff;
  --color-hero-bg:      #0f172a;
  --color-hero-text:    #f1f5f9;
  --color-hero-muted:   #94a3b8;

  --font:        'Inter', system-ui, sans-serif;
  --radius:      12px;
  --radius-sm:   8px;
  --shadow:      0 1px 3px rgba(0,0,0,.07), 0 4px 12px rgba(0,0,0,.05);
  --shadow-hover:0 4px 8px rgba(0,0,0,.10), 0 12px 32px rgba(0,0,0,.08);
  --nav-height:  64px;
  --ease:        0.2s ease;
}

/* =============================================
   RESET Y BASE
   ============================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img  { max-width: 100%; display: block; }
a    { color: inherit; text-decoration: none; }
ul   { list-style: none; }

/* =============================================
   CONTENEDOR
   ============================================= */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* =============================================
   NAVEGACIÓN
   ============================================= */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(15, 23, 42, 0.96);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  z-index: 100;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: box-shadow var(--ease);
}

.nav--scrolled { box-shadow: 0 4px 24px rgba(0,0,0,.35); }

.nav__brand {
  color: #fff;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.nav__links {
  display: flex;
  gap: 4px;
}

.nav__links a {
  color: var(--color-hero-muted);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 6px;
  transition: color var(--ease), background var(--ease);
}

.nav__links a:hover,
.nav__links a.active {
  color: #fff;
  background: rgba(255,255,255,0.08);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 6px;
}

.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform var(--ease), opacity var(--ease);
}

/* =============================================
   HERO
   ============================================= */
.hero {
  min-height: 100vh;
  background: var(--color-hero-bg);
  background-image: radial-gradient(ellipse at 60% 40%, rgba(29,78,216,.15) 0%, transparent 70%);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--nav-height) + 56px) 24px 80px;
}

.hero__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  max-width: 680px;
}

.hero__photo {
  width: 144px;
  height: 144px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid rgba(255,255,255,0.12);
  box-shadow: 0 0 0 8px rgba(29,78,216,.18);
}

.hero__name {
  color: #fff;
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.1;
}

.hero__titular {
  color: var(--color-hero-muted);
  font-size: clamp(0.95rem, 2.2vw, 1.15rem);
  font-weight: 400;
  max-width: 560px;
  line-height: 1.55;
}

.hero__buttons {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 8px;
}

/* =============================================
   BOTONES
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 600;
  transition: background var(--ease), border-color var(--ease), transform var(--ease), box-shadow var(--ease);
  cursor: pointer;
  border: 1.5px solid transparent;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(29,78,216,.4);
}

.btn--ghost {
  background: transparent;
  color: #e2e8f0;
  border-color: rgba(255,255,255,.18);
}

.btn--ghost:hover {
  background: rgba(255,255,255,.08);
  border-color: rgba(255,255,255,.35);
  transform: translateY(-1px);
}

/* =============================================
   SECCIONES
   ============================================= */
.section { padding: 88px 0; }
.section--alt { background: var(--color-bg-alt); }

.section__heading {
  font-size: clamp(1.55rem, 3vw, 1.9rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 40px;
  position: relative;
  padding-bottom: 14px;
}

.section__heading::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 36px; height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
}

/* =============================================
   SOBRE MÍ
   ============================================= */
.about__bio {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 740px;
  line-height: 1.85;
}

/* =============================================
   TARJETAS DE CURSOS
   ============================================= */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 22px;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--ease), transform var(--ease);
}

.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.card__ciclo {
  display: inline-block;
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 100px;
  margin-bottom: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  width: fit-content;
}

.card__name {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.card__desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  flex: 1;
  margin-bottom: 18px;
}

.card__teacher {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-accent);
  padding: 6px 12px;
  border-radius: 6px;
  background: var(--color-accent-light);
  transition: background var(--ease);
  width: fit-content;
}

.card__teacher:hover { background: #dbeafe; }

.card__teacher--plain {
  cursor: default;
  pointer-events: none;
  color: var(--color-text-muted);
  background: var(--color-bg-alt);
}

.card__teacher-icon {
  width: 14px; height: 14px;
  fill: currentColor;
  flex-shrink: 0;
}

/* =============================================
   TARJETAS DE COMPAÑEROS
   ============================================= */
.peers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 16px;
}

.peer-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 28px 16px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  transition: box-shadow var(--ease), transform var(--ease), border-color var(--ease);
}

.peer-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
  border-color: var(--color-accent);
}

.peer-card__avatar {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, #1d4ed8 0%, #7c3aed 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  flex-shrink: 0;
  user-select: none;
}

.peer-card__name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
}

.peer-card__cta {
  font-size: 0.76rem;
  color: var(--color-accent);
  font-weight: 500;
}

/* =============================================
   FOOTER / CONTACTO
   ============================================= */
.footer {
  background: var(--color-hero-bg);
  color: var(--color-hero-text);
  padding: 72px 0 44px;
  text-align: center;
}

.footer__heading {
  font-size: clamp(1.6rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 36px;
  letter-spacing: -0.03em;
}

.footer__links {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 44px;
}

.footer__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: #e2e8f0;
  border: 1.5px solid rgba(255,255,255,.14);
  transition: background var(--ease), border-color var(--ease);
}

.footer__link:hover {
  background: rgba(255,255,255,.08);
  border-color: rgba(255,255,255,.3);
}

.footer__copy {
  font-size: 0.8rem;
  color: var(--color-hero-muted);
}

/* =============================================
   RESPONSIVE — TABLET
   ============================================= */
@media (max-width: 768px) {
  .nav { padding: 0 20px; }

  .nav__links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    background: #0f172a;
    flex-direction: column;
    padding: 12px 16px 20px;
    gap: 2px;
    border-top: 1px solid rgba(255,255,255,.06);
    border-bottom: 1px solid rgba(255,255,255,.06);
  }

  .nav__links.is-open { display: flex; }

  .nav__links a { padding: 10px 16px; display: block; }

  .nav__toggle { display: flex; }

  .section { padding: 64px 0; }

  .cards-grid { grid-template-columns: 1fr; }

  .peers-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
}

/* =============================================
   RESPONSIVE — MÓVIL
   ============================================= */
@media (max-width: 480px) {
  .hero__buttons {
    flex-direction: column;
    width: 100%;
    max-width: 260px;
  }

  .btn { justify-content: center; }

  .peers-grid { grid-template-columns: repeat(2, 1fr); }

  .footer__links { flex-direction: column; align-items: center; }
}