/* =====================================================
   side-nav.css — Navegación vertical fija (extremo derecho)
   Estética Cyberpunk / HUD de alta calidad.

   ESTRUCTURA:
   - .side-nav ocupa el 100% de alto del viewport (menos header)
   - Línea vertical ::before spans toda la altura, con fade mask
     en top/bottom (15% transparente cada extremo, sólido en medio)
   - Items (arrow + 5 dots) centrados verticalmente con
     space-evenly → distribuidos en la parte SÓLIDA de la línea
   - padding-block 16vh → empuja los items al área sólida

   ENTRANCE TIMELINE (al cargar la página):
     0ms    → flecha desciende desde arriba (opacity 0 → 0.3)
     200ms  → línea vertical empieza a dibujarse (top → bottom)
     400ms  → HERO (2026) v1.0 entra desde la derecha
     540ms  → > SERVICES
     680ms  → > PORTFOLIO
     820ms  → > ABOUT
     960ms  → > CONTACT
     ~1560ms → todo en posición
     600ms+ → flecha inicia fade in/out infinito (lento)
   ===================================================== */

.side-nav {
  position: fixed;
  top: var(--header-height);
  bottom: 0;
  right: clamp(1rem, 1.5vw, 1.5rem);
  z-index: var(--z-header);
  display: none; /* hidden on mobile & tablet */
  flex-direction: column;
  align-items: flex-end; /* hijos directos (arrow, list) alineados a la derecha */
  pointer-events: none;  /* contenedor transparente a clicks; hijos sí */
}

.side-nav > * { pointer-events: auto; }

@media (min-width: 1024px) {
  .side-nav { display: flex; }
}

/* =====================================================
   LÍNEA VERTICAL (::before del contenedor)
   - Spans toda la altura (.side-nav top:0 a bottom:0)
   - 2px solid cyan con glow box-shadow (más fuerte)
   - Mask gradiente: fade 0-15% y 85-100%, sólido 15-85%
   - Animación de entrada: scaleY 0 → 1 (draw top → bottom)
   ===================================================== */

.side-nav::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  right: 5px; /* centro de un dot de 11px de ancho */
  width: 2px;
  /* Gradiente cyan con intensidad variable según --active-y.
     El JS actualiza --active-y según el item activo del side-nav,
     moviendo el "punto más brillante" del gradiente a la altura
     del dot activo. Dim (0.2) en los extremos, bright (0.9) en active-y. */
  background: linear-gradient(
    to bottom,
    rgba(73, 197, 182, 0.2) 0%,
    rgba(73, 197, 182, 0.2) calc(var(--active-y, 50%) - 18%),
    rgba(73, 197, 182, 0.9) var(--active-y, 50%),
    rgba(73, 197, 182, 0.2) calc(var(--active-y, 50%) + 18%),
    rgba(73, 197, 182, 0.2) 100%
  );
  box-shadow:
    0 0 8px rgba(73, 197, 182, 0.55),
    0 0 18px rgba(73, 197, 182, 0.25);
  /* Mask: fade en top/bottom, sólido en el medio */
  -webkit-mask-image: linear-gradient(
    to bottom,
    transparent 0%,
    black 15%,
    black 85%,
    transparent 100%
  );
  mask-image: linear-gradient(
    to bottom,
    transparent 0%,
    black 15%,
    black 85%,
    transparent 100%
  );
  pointer-events: none;
  /* Entrada: dibuja de arriba abajo */
  transform: scaleY(0);
  transform-origin: top;
  animation: side-nav-line-draw 1300ms var(--ease-out-expo) 200ms forwards;
}

@keyframes side-nav-line-draw {
  to { transform: scaleY(1); }
}

/* =====================================================
   FLECHA-TRIGGER (círculo con fade in/out infinito)
   La luz se enciende y se apaga gradualmente.
   ===================================================== */

.side-nav__arrow {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  margin-bottom: var(--space-3);
  /* Centrar horizontalmente sobre la línea (right: 5px):
     arrow right edge → right: 5px - 19px = right: -14px
     → margin-right negativo de 14px */
  margin-right: -14px;
  border-radius: 50%;
  border: 1.5px solid var(--accent-color);
  background: rgba(11, 15, 25, 0.55);
  backdrop-filter: blur(6px);
  color: var(--accent-color);
  cursor: pointer;

  transition:
    transform var(--dur-fast) var(--ease-spring),
    border-color var(--dur-base) var(--ease-smooth);

  /* Estado inicial (entrada) */
  opacity: 0;
  transform: translateY(-12px);

  /* Animaciones:
     1) Entrada (1x) — termina en opacity 0.3 (estado "apagado")
     2) Fade in/out (infinite, lento, ease-in-out) — luz gradual */
  animation:
    side-nav-arrow-enter 600ms var(--ease-out-expo) forwards,
    side-nav-arrow-fade  3800ms var(--ease-in-out-quart) 600ms infinite;
}

.side-nav__arrow:hover {
  border-color: var(--accent-soft);
  transform: scale(1.08);
  /* Pausa el fade mientras el cursor está encima */
  animation-play-state: paused;
}

.side-nav__arrow:focus-visible {
  outline: none;
  border-color: var(--accent-soft);
  box-shadow:
    0 0 0 3px rgba(73, 197, 182, 0.25),
    0 0 12px rgba(73, 197, 182, 0.6);
}

.side-nav__arrow svg { display: block; }

/* Entrada: aparece desde arriba, fade-in a estado "apagado" (0.3) */
@keyframes side-nav-arrow-enter {
  from {
    opacity: 0;
    transform: translateY(-12px);
  }
  to {
    opacity: 0.3;
    transform: translateY(0);
  }
}

/* Fade infinito: la luz se enciende y se apaga gradualmente.
   ease-in-out-quart da una transición muy suave, "poco a poco". */
@keyframes side-nav-arrow-fade {
  0%, 100% {
    opacity: 0.3;
    box-shadow:
      0 0 4px rgba(73, 197, 182, 0.15),
      inset 0 0 4px rgba(73, 197, 182, 0.05);
  }
  50% {
    opacity: 1;
    box-shadow:
      0 0 14px rgba(73, 197, 182, 0.6),
      0 0 28px rgba(73, 197, 182, 0.3),
      inset 0 0 12px rgba(73, 197, 182, 0.25);
  }
}

/* =====================================================
   LIST — Ocupa todo el alto restante bajo el arrow,
   distribuye los 5 items a lo largo de su altura.
   ===================================================== */

.side-nav__list {
  /* Toma todo el espacio vertical que deja libre el arrow */
  flex: 1;
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between; /* primer item al borde superior del list, último al inferior */
  align-items: flex-end;          /* items alineados a la derecha (con la línea) */
  padding-block: 6vh;             /* respiro para que los items no toquen el arrow ni el borde inferior */
  margin: 0;
  list-style: none;

  position: relative;
  /* Estado inicial (entrada) */
  opacity: 0;
  transform: translateY(12px);
  animation: side-nav-list-enter 600ms var(--ease-out-expo) 200ms forwards;
}

@keyframes side-nav-list-enter {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* =====================================================
   ITEMS — Nodos sólidos + etiquetas HUD monoespaciadas
   ===================================================== */

.side-nav__item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  /* row-reverse → dot en el borde derecho (sobre la línea),
     label hacia el interior (a la izquierda de la línea) */
  flex-direction: row-reverse;
  padding: var(--space-1) 0;
  cursor: pointer;
  position: relative;
  text-decoration: none;
  color: inherit;
  border-radius: var(--radius-sm);

  /* Estado inicial (entrada) */
  opacity: 0;
  transform: translateX(24px) scale(0.9);
  animation: side-nav-item-enter 600ms var(--ease-out-expo) forwards;
}

/* Cascada de delays */
.side-nav__list li:nth-child(1) .side-nav__item { animation-delay: 400ms; }
.side-nav__list li:nth-child(2) .side-nav__item { animation-delay: 540ms; }
.side-nav__list li:nth-child(3) .side-nav__item { animation-delay: 680ms; }
.side-nav__list li:nth-child(4) .side-nav__item { animation-delay: 820ms; }
.side-nav__list li:nth-child(5) .side-nav__item { animation-delay: 960ms; }

@keyframes side-nav-item-enter {
  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

.side-nav__item:focus-visible {
  outline: none;
}
.side-nav__item:focus-visible .side-nav__dot {
  box-shadow:
    0 0 0 3px rgba(73, 197, 182, 0.25),
    0 0 12px #49c5b6;
}

/* =====================================================
   DOT (nodo sólido)
   - default: 11px cyan a 0.55 opacity + anillo sutil
   - hover: scale 1.2x + glow más fuerte
   - active: scale 1.5x + glow 0 0 14px #49c5b6 + halo
   ===================================================== */

.side-nav__dot {
  flex-shrink: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: #49c5b6;
  opacity: 0.55;
  position: relative;
  z-index: 1;
  /* Anillo exterior sutil */
  box-shadow:
    0 0 0 1px rgba(73, 197, 182, 0.25),
    0 0 6px rgba(73, 197, 182, 0.25);
  transition:
    background var(--dur-base) var(--ease-smooth),
    opacity var(--dur-base) var(--ease-smooth),
    box-shadow var(--dur-base) var(--ease-smooth),
    transform var(--dur-base) var(--ease-spring);
}

.side-nav__item:hover .side-nav__dot {
  opacity: 0.95;
  transform: scale(1.2);
  box-shadow:
    0 0 0 1px rgba(73, 197, 182, 0.45),
    0 0 12px rgba(73, 197, 182, 0.7);
}

.side-nav__item.is-active .side-nav__dot {
  opacity: 1;
  background: #49c5b6;
  transform: scale(1.5);
  box-shadow:
    0 0 0 2px rgba(73, 197, 182, 0.35),
    0 0 14px #49c5b6,
    0 0 28px rgba(73, 197, 182, 0.4);
}

/* =====================================================
   TICK (línea horizontal que conecta dot → label)
   - Span: 14px de ancho × 2px de alto
   - Se alinea al centro vertical del dot (la mitad del dot)
   - Hereda el color dim y se "ilumina" en hover/active
   ===================================================== */

.side-nav__tick {
  flex-shrink: 0;
  width: 14px;
  height: 2px;
  background: rgba(73, 197, 182, 0.45);
  border-radius: 1px;
  align-self: center;
  box-shadow: 0 0 4px rgba(73, 197, 182, 0.25);
  transition:
    background var(--dur-base) var(--ease-smooth),
    width var(--dur-base) var(--ease-smooth),
    box-shadow var(--dur-base) var(--ease-smooth);
}

.side-nav__item:hover .side-nav__tick {
  width: 18px;
  background: rgba(73, 197, 182, 0.85);
  box-shadow: 0 0 8px rgba(73, 197, 182, 0.55);
}

.side-nav__item.is-active .side-nav__tick {
  width: 22px;
  background: #49c5b6;
  box-shadow:
    0 0 8px rgba(73, 197, 182, 0.75),
    0 0 14px rgba(73, 197, 182, 0.35);
}

/* =====================================================
   LABEL HUD (12px mono, mayúsculas)
   ===================================================== */

.side-nav__label {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  color: var(--text-dim);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  white-space: nowrap;
  transition:
    color var(--dur-base) var(--ease-smooth),
    text-shadow var(--dur-base) var(--ease-smooth),
    transform var(--dur-base) var(--ease-smooth);
}

.side-nav__item:hover .side-nav__label {
  color: var(--accent-color);
  text-shadow: 0 0 8px rgba(73, 197, 182, 0.6);
  transform: translateX(-4px);
}

.side-nav__item.is-active .side-nav__label {
  color: var(--accent-color);
  text-shadow:
    0 0 10px rgba(73, 197, 182, 0.85),
    0 0 18px rgba(73, 197, 182, 0.4);
  transform: translateX(-4px);
}

/* =====================================================
   PULSO SECUENCIAL al entrar la sección (uno por sección)
   ===================================================== */

@keyframes side-nav-dot-enter {
  0% {
    transform: scale(1);
    box-shadow: 0 0 0 transparent;
  }
  40% {
    transform: scale(2.2);
    box-shadow:
      0 0 24px rgba(73, 197, 182, 0.9),
      0 0 48px rgba(73, 197, 182, 0.4);
  }
  100% {
    transform: scale(1.5);
    box-shadow:
      0 0 0 2px rgba(73, 197, 182, 0.35),
      0 0 14px #49c5b6,
      0 0 28px rgba(73, 197, 182, 0.4);
  }
}

@keyframes side-nav-tick-enter {
  0% { width: 14px; background: rgba(73, 197, 182, 0.45); }
  40% { width: 26px; background: #49c5b6; }
  100% { width: 22px; background: #49c5b6; }
}

@keyframes side-nav-label-enter {
  0% {
    color: var(--text-dim);
    text-shadow: 0 0 0 transparent;
  }
  40% {
    color: var(--accent-soft);
    text-shadow:
      0 0 14px rgba(73, 197, 182, 0.9),
      0 0 24px rgba(73, 197, 182, 0.45);
  }
  100% {
    color: var(--accent-color);
    text-shadow:
      0 0 10px rgba(73, 197, 182, 0.85),
      0 0 18px rgba(73, 197, 182, 0.4);
  }
}

.side-nav__item.is-pulsing .side-nav__dot {
  animation: side-nav-dot-enter 1.4s var(--ease-out-expo);
}

.side-nav__item.is-pulsing .side-nav__tick {
  animation: side-nav-tick-enter 1.4s var(--ease-out-expo);
}

.side-nav__item.is-pulsing .side-nav__label {
  animation: side-nav-label-enter 1.4s var(--ease-out-expo);
}

/* =====================================================
   prefers-reduced-motion
   ===================================================== */
@media (prefers-reduced-motion: reduce) {
  .side-nav__arrow,
  .side-nav__list,
  .side-nav__item,
  .side-nav::before,
  .side-nav__item.is-pulsing .side-nav__dot,
  .side-nav__item.is-pulsing .side-nav__tick,
  .side-nav__item.is-pulsing .side-nav__label {
    animation: none;
  }
  /* Estados finales estáticos */
  .side-nav__arrow {
    opacity: 1;
    transform: none;
  }
  .side-nav::before {
    transform: none;
  }
  .side-nav__list {
    opacity: 1;
    transform: none;
  }
  .side-nav__item {
    opacity: 1;
    transform: none;
  }
}