/* =========================================================================
   PORTFOLIO — Aldayr Hernández Figueroa
   Estructura del archivo:
   1. Reset & Variables (tokens de diseño)
   2. Utilidades base (contenedor, tipografía, scrollbar)
   3. Cursor personalizado / Progress bar / Partículas
   4. Navbar
   5. Hero
   6. Secciones genéricas
   7. Sobre mí
   8. Habilidades técnicas
   9. Competencias profesionales
   10. Metodologías
   11. Certificaciones
   12. Experiencia
   13. Proyectos
   14. Contacto
   15. Footer
   16. Botones / Toast / Back to top
   17. Animaciones (reveal, fade, glow, etc.)
   18. Responsive
   ========================================================================= */

/* ============================== 1. RESET & VARIABLES ============================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Paleta — modo oscuro (por defecto) */
  --color-bg-deep: #020617;
  --color-bg-deep-2: #0B1120;
  --color-bg-primary: #0F172A;
  --color-bg-secondary: #1E293B;
  --color-accent: #3B82F6;
  --color-accent-soft: rgba(59, 130, 246, .16);
  --color-accent-glow: rgba(59, 130, 246, .35);
  --color-text: #F8FAFC;
  --color-text-muted: #CBD5E1;
  --color-border: #334155;

  --surface-glass: rgba(30, 41, 59, .45);
  --surface-glass-border: rgba(148, 163, 184, .14);

  --font-display: 'Poppins', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;

  --container-w: 1180px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 26px;

  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --dur-fast: .25s;
  --dur-med: .5s;
  --dur-slow: .9s;

  color-scheme: dark;
}

html[data-theme="light"] {
  --color-bg-deep: #F1F5F9;
  --color-bg-deep-2: #E8EDF4;
  --color-bg-primary: #FFFFFF;
  --color-bg-secondary: #F8FAFC;
  --color-accent: #2563EB;
  --color-accent-soft: rgba(37, 99, 235, .10);
  --color-accent-glow: rgba(37, 99, 235, .22);
  --color-text: #0F172A;
  --color-text-muted: #475569;
  --color-border: #E2E8F0;

  --surface-glass: rgba(255, 255, 255, .55);
  --surface-glass-border: rgba(15, 23, 42, .08);

  color-scheme: light;
}

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  background: var(--color-bg-deep);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background var(--dur-med) var(--ease-out), color var(--dur-med) var(--ease-out);
}

/* Oculta el cursor nativo solo en dispositivos con puntero fino (desktop) */
@media (hover: hover) and (pointer: fine) {
  body { cursor: none; }
  a, button { cursor: none; }
}

::selection { background: var(--color-accent); color: #fff; }

/* Scrollbar personalizado */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--color-bg-deep); }
::-webkit-scrollbar-thumb {
  background: var(--color-bg-secondary);
  border-radius: 10px;
  border: 2px solid var(--color-bg-deep);
}
::-webkit-scrollbar-thumb:hover { background: var(--color-accent); }

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

/* ============================== 2. UTILIDADES ============================== */
.container {
  width: min(100% - 3rem, var(--container-w));
  margin-inline: auto;
}

.section { padding: clamp(4.5rem, 9vw, 7.5rem) 0; position: relative; }
.section--alt { background: var(--color-bg-deep-2); }

.section__eyebrow {
  font-family: var(--font-display);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: .9rem;
}

.section__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.8rem, 3.4vw, 2.7rem);
  letter-spacing: -.02em;
  margin-bottom: .9rem;
}

.section__subtitle {
  color: var(--color-text-muted);
  max-width: 640px;
  font-size: 1.02rem;
  margin-bottom: 3rem;
}

/* ============================== 3. CURSOR / PROGRESS / PARTÍCULAS ============================== */
.cursor-dot, .cursor-ring {
  position: fixed;
  top: 0; left: 0;
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  will-change: transform;
}
.cursor-dot {
  width: 6px; height: 6px;
  background: var(--color-accent);
  display: none;
}
.cursor-ring {
  width: 34px; height: 34px;
  border: 1.5px solid var(--color-accent);
  opacity: .55;
  transition: width var(--dur-fast) var(--ease-out), height var(--dur-fast) var(--ease-out), opacity var(--dur-fast) var(--ease-out), border-color var(--dur-fast);
  display: none;
}
.cursor-ring.is-active { width: 52px; height: 52px; opacity: .9; background: var(--color-accent-soft); }

@media (hover: hover) and (pointer: fine) {
  .cursor-dot, .cursor-ring { display: block; }
}

.progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent), #60A5FA);
  z-index: 9998;
  transition: width .1s linear;
}

#particles {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: .5;
}

/* ============================== 4. NAVBAR ============================== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 900;
  padding: 1.1rem 0;
  transition: padding var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out), border-color var(--dur-fast);
  border-bottom: 1px solid transparent;
}
.navbar.is-scrolled {
  padding: .7rem 0;
  background: var(--surface-glass);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--surface-glass-border);
  box-shadow: 0 10px 30px -20px rgba(0,0,0,.6);
}

.navbar__inner {
  width: min(100% - 3rem, var(--container-w));
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.navbar__logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: .02em;
}
.navbar__logo .dot { color: var(--color-accent); }

.navbar__links {
  display: flex;
  gap: 1.9rem;
  margin-inline: auto;
}
.nav-link {
  position: relative;
  font-size: .9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  padding: .3rem 0;
  transition: color var(--dur-fast);
}
.nav-link::after {
  content: '';
  position: absolute;
  left: 0; bottom: -2px;
  width: 0%; height: 1.5px;
  background: var(--color-accent);
  transition: width var(--dur-fast) var(--ease-out);
}
.nav-link:hover { color: var(--color-text); }
.nav-link:hover::after { width: 100%; }

.navbar__actions { display: flex; align-items: center; gap: .7rem; }

.theme-toggle {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition: border-color var(--dur-fast), color var(--dur-fast), transform var(--dur-fast);
}
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-moon { display: none; }
html[data-theme="light"] .theme-toggle .icon-sun { display: none; }
html[data-theme="light"] .theme-toggle .icon-moon { display: block; }
.theme-toggle:hover { color: var(--color-accent); border-color: var(--color-accent); transform: rotate(20deg); }

.navbar__burger {
  display: none;
  width: 40px; height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}
.navbar__burger span {
  width: 20px; height: 1.5px;
  background: var(--color-text);
  transition: transform var(--dur-fast) var(--ease-out), opacity var(--dur-fast);
}
.navbar__burger.is-open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.navbar__burger.is-open span:nth-child(2) { opacity: 0; }
.navbar__burger.is-open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ============================== 5. HERO ============================== */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  isolation: isolate;
}

.hero__bg-grid {
  position: absolute;
  inset: -1px;
  z-index: -2;
  background-image:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: .18;
  mask-image: radial-gradient(circle at 30% 30%, black, transparent 75%);
}

.hero__glow {
  position: absolute;
  top: -20%; right: -10%;
  width: 60vw; height: 60vw;
  max-width: 720px; max-height: 720px;
  background: radial-gradient(circle, var(--color-accent-glow), transparent 70%);
  z-index: -1;
  filter: blur(10px);
  animation: float-glow 12s ease-in-out infinite;
}
@keyframes float-glow {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-4%, 5%) scale(1.08); }
}

.hero__content { padding-block: 8rem 6rem; }

.hero__eyebrow {
  font-family: var(--font-display);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1.4rem;
}

.hero__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.3rem, 6.4vw, 4.6rem);
  line-height: 1.06;
  letter-spacing: -.03em;
  margin-bottom: 1.3rem;
}
.hero__name .line { display: block; overflow: hidden; }

.hero__role {
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 2vw, 1.4rem);
  font-weight: 600;
  color: var(--color-accent);
  min-height: 1.6em;
  margin-bottom: 1.6rem;
}
.cursor-blink { animation: blink 1s steps(1) infinite; color: var(--color-accent); }
@keyframes blink { 50% { opacity: 0; } }

.hero__tagline {
  max-width: 620px;
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  color: var(--color-text-muted);
  margin-bottom: 2.6rem;
}

.hero__actions { display: flex; flex-wrap: wrap; gap: 1rem; }

.hero__scroll {
  position: absolute;
  bottom: 2.4rem; left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .6rem;
  color: var(--color-text-muted);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.hero__scroll-line {
  width: 1px; height: 34px;
  background: linear-gradient(var(--color-accent), transparent);
  position: relative;
  overflow: hidden;
}
.hero__scroll-line::after {
  content: '';
  position: absolute;
  top: -100%; left: 0;
  width: 100%; height: 100%;
  background: var(--color-text);
  animation: scroll-line 2s var(--ease-out) infinite;
}
@keyframes scroll-line { to { top: 100%; } }

/* ============================== 7. SOBRE MÍ ============================== */
.about__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}
.about__text p { color: var(--color-text-muted); margin-bottom: 1.1rem; font-size: 1.02rem; }
.about__text strong { color: var(--color-text); font-weight: 600; }

.about__stats { display: grid; gap: 1rem; }
.stat-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.4rem 1.5rem;
  transition: transform var(--dur-fast) var(--ease-out), border-color var(--dur-fast);
}
.stat-card:hover { transform: translateY(-4px); border-color: var(--color-accent); }
.stat-card__value {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 2.1rem;
  color: var(--color-accent);
}
.stat-card__label { color: var(--color-text-muted); font-size: .86rem; }

/* ============================== 8. HABILIDADES ============================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 1.2rem;
}

.skill-card {
  background: var(--surface-glass);
  border: 1px solid var(--surface-glass-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: transform var(--dur-fast) var(--ease-out), border-color var(--dur-fast), box-shadow var(--dur-fast);
  opacity: 0;
  transform: translateY(24px);
}
.skill-card.is-visible { opacity: 1; transform: translateY(0); }
.skill-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-accent);
  box-shadow: 0 20px 40px -24px var(--color-accent-glow);
}

.skill-card__icon {
  width: 42px; height: 42px;
  display: grid; place-items: center;
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
  color: var(--color-accent);
  margin-bottom: 1rem;
}
.skill-card__icon svg { width: 22px; height: 22px; }

.skill-card__name { font-family: var(--font-display); font-weight: 600; font-size: 1.02rem; margin-bottom: .35rem; }
.skill-card__desc { color: var(--color-text-muted); font-size: .85rem; margin-bottom: 1.1rem; min-height: 2.6em; }

.skill-card__bar-track {
  height: 5px;
  border-radius: 4px;
  background: var(--color-border);
  overflow: hidden;
}
.skill-card__bar-fill {
  height: 100%;
  width: 0%;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--color-accent), #60A5FA);
  transition: width 1.1s var(--ease-out);
}
.skill-card__level { display: flex; justify-content: space-between; font-size: .72rem; color: var(--color-text-muted); margin-top: .5rem; }

/* ============================== 9. COMPETENCIAS ============================== */
.competencies-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 1rem;
}
.competency-card {
  display: flex;
  align-items: center;
  gap: .9rem;
  padding: 1.1rem 1.2rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: transform var(--dur-fast) var(--ease-out), border-color var(--dur-fast);
  opacity: 0;
  transform: translateY(18px);
}
.competency-card.is-visible { opacity: 1; transform: translateY(0); }
.competency-card:hover { transform: translateY(-4px); border-color: var(--color-accent); }
.competency-card__icon {
  flex-shrink: 0;
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--color-accent-soft);
  color: var(--color-accent);
}
.competency-card__icon svg { width: 17px; height: 17px; }
.competency-card__label { font-size: .92rem; font-weight: 500; }

/* ============================== 10. METODOLOGÍAS ============================== */
.methodology__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.1rem;
}
.methodology-card {
  padding: 1.5rem;
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, var(--color-bg-secondary), var(--color-bg-primary));
  border: 1px solid var(--color-border);
  transition: transform var(--dur-fast) var(--ease-out), border-color var(--dur-fast);
  opacity: 0;
  transform: translateY(18px);
}
.methodology-card.is-visible { opacity: 1; transform: translateY(0); }
.methodology-card:hover { transform: translateY(-5px); border-color: var(--color-accent); }
.methodology-card__title { font-family: var(--font-display); font-weight: 600; margin-bottom: .4rem; font-size: 1rem; }
.methodology-card__desc { color: var(--color-text-muted); font-size: .85rem; }

/* ============================== 11. CERTIFICACIONES ============================== */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.2rem;
}
.cert-card {
  padding: 1.6rem;
  border-radius: var(--radius-md);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  transition: transform var(--dur-fast) var(--ease-out), border-color var(--dur-fast);
  opacity: 0;
  transform: translateY(18px);
}
.cert-card.is-visible { opacity: 1; transform: translateY(0); }
.cert-card:hover { transform: translateY(-5px); border-color: var(--color-accent); }
.cert-card__icon { font-size: 1.6rem; margin-bottom: .9rem; }
.cert-card__title { font-family: var(--font-display); font-weight: 600; font-size: 1rem; margin-bottom: .4rem; }
.cert-card__desc { color: var(--color-text-muted); font-size: .85rem; }

.cert-card--empty {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  border-style: dashed;
  gap: .9rem;
}
.cert-card--empty .cert-card__title { color: var(--color-text-muted); }
.btn--mini {
  font-size: .78rem;
  padding: .55rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  transition: background var(--dur-fast), color var(--dur-fast);
}
.btn--mini:hover { background: var(--color-accent); color: #fff; }

/* ============================== 12. EXPERIENCIA ============================== */
.experience-card {
  display: flex;
  gap: 1.4rem;
  background: var(--surface-glass);
  border: 1px solid var(--surface-glass-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: 2rem;
}
.experience-card__marker {
  flex-shrink: 0;
  width: 12px; height: 12px;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 6px var(--color-accent-soft);
}
.experience-card__tag {
  display: inline-block;
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: .8rem;
}
.experience-card__body p { color: var(--color-text-muted); margin-bottom: .8rem; }
.experience-card__body strong { color: var(--color-text); }

/* ============================== 13. PROYECTOS ============================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.4rem;
}
.project-card {
  position: relative;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
  overflow: hidden;
  min-height: 240px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.6rem;
  opacity: 0;
  transform: translateY(18px);
  transition: transform var(--dur-med) var(--ease-out), border-color var(--dur-fast);
}
.project-card.is-visible { opacity: 1; transform: translateY(0); }
.project-card::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(160deg, var(--color-accent-soft), transparent 60%);
  opacity: 0;
  transition: opacity var(--dur-fast);
}
.project-card:hover { transform: translateY(-8px); border-color: var(--color-accent); }
.project-card:hover::before { opacity: 1; }
.project-card__number {
  position: absolute; top: 1.4rem; right: 1.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: .8rem;
  color: var(--color-text-muted);
}
.project-card__title { font-family: var(--font-display); font-weight: 600; font-size: 1.1rem; margin-bottom: .4rem; position: relative; z-index: 1; }
.project-card__desc { color: var(--color-text-muted); font-size: .86rem; margin-bottom: 1.2rem; position: relative; z-index: 1; }
.project-card__link {
  position: relative; z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-size: .84rem;
  font-weight: 600;
  color: var(--color-accent);
  opacity: .7;
}
.project-card__link svg { width: 14px; height: 14px; transition: transform var(--dur-fast) var(--ease-out); }
.project-card:hover .project-card__link { opacity: 1; }
.project-card:hover .project-card__link svg { transform: translateX(4px); }

/* ============================== 14. CONTACTO ============================== */
.contact-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2.5rem;
  align-items: center;
  padding: 2.4rem;
  border-radius: var(--radius-lg);
  background: var(--surface-glass);
  border: 1px solid var(--surface-glass-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.contact-card__info { display: grid; gap: 1rem; }
.contact-row { display: flex; gap: 1rem; align-items: baseline; flex-wrap: wrap; }
.contact-row__label {
  min-width: 90px;
  font-size: .76rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--color-text-muted);
}
.contact-row__value { font-weight: 500; }
.contact-card__actions { display: flex; flex-direction: column; gap: .8rem; min-width: 220px; }

/* ============================== 15. FOOTER ============================== */
.footer { padding: 3rem 0; border-top: 1px solid var(--color-border); }
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer__brand { font-family: var(--font-display); font-weight: 700; }
.footer__brand .dot { color: var(--color-accent); }
.footer__phrase { color: var(--color-text-muted); font-size: .88rem; font-style: italic; }
.footer__copy { color: var(--color-text-muted); font-size: .78rem; }

/* ============================== 16. BOTONES / TOAST / BACK TO TOP ============================== */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  padding: .9rem 1.7rem;
  border-radius: 999px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: .92rem;
  letter-spacing: .01em;
  overflow: hidden;
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast), border-color var(--dur-fast), background var(--dur-fast);
}
.btn svg { width: 16px; height: 16px; }
.btn:active { transform: scale(.97); }

.btn--primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 12px 30px -12px var(--color-accent-glow);
}
.btn--primary::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(120deg, transparent, rgba(255,255,255,.35), transparent);
  transform: translateX(-120%);
  transition: transform .6s var(--ease-out);
}
.btn--primary:hover::after { transform: translateX(120%); }
.btn--primary:hover { transform: translateY(-3px); box-shadow: 0 16px 36px -10px var(--color-accent-glow); }

.btn--ghost {
  background: var(--surface-glass);
  border: 1px solid var(--surface-glass-border);
  color: var(--color-text);
}
.btn--ghost:hover { border-color: var(--color-accent); transform: translateY(-3px); }

.btn--outline {
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
}
.btn--outline:hover { background: var(--color-accent); color: #fff; transform: translateY(-3px); }

.toast {
  position: fixed;
  bottom: 2rem; left: 50%;
  transform: translate(-50%, 30px);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-accent);
  color: var(--color-text);
  padding: .8rem 1.4rem;
  border-radius: 999px;
  font-size: .85rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
  z-index: 9997;
  box-shadow: 0 20px 40px -16px rgba(0,0,0,.5);
}
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

.back-to-top {
  position: fixed;
  bottom: 2rem; right: 2rem;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--surface-glass);
  border: 1px solid var(--surface-glass-border);
  backdrop-filter: blur(10px);
  display: grid; place-items: center;
  color: var(--color-text);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out), border-color var(--dur-fast);
  z-index: 800;
}
.back-to-top svg { width: 18px; height: 18px; }
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { border-color: var(--color-accent); color: var(--color-accent); }

/* ============================== 17. ANIMACIONES (reveal) ============================== */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .8s var(--ease-out), transform .8s var(--ease-out);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

.hero__eyebrow.reveal.is-visible { transition-delay: .05s; }
.hero__name .line { transition-delay: .12s; }
.hero__role.reveal.is-visible { transition-delay: .32s; }
.hero__tagline.reveal.is-visible { transition-delay: .44s; }
.hero__actions.reveal.is-visible { transition-delay: .56s; }

/* ============================== 18. RESPONSIVE ============================== */
@media (max-width: 980px) {
  .navbar__links { display: none; }
  .navbar__burger { display: flex; }

  .navbar__links.is-open {
    display: flex;
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    padding: 1.5rem;
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
    gap: 1.1rem;
  }

  .about__grid { grid-template-columns: 1fr; }
  .contact-card { grid-template-columns: 1fr; }
  .contact-card__actions { min-width: 0; }
}

@media (max-width: 560px) {
  .hero__content { padding-block: 7rem 4rem; }
  .hero__actions { flex-direction: column; align-items: stretch; }
  .contact-card__actions { width: 100%; }
  .btn { justify-content: center; }
}