/* ──────────────────────────────────────────────────────────
   SAVA · Home hero — background variants
   Activado vía clase .hero-bd con modifier .v-{variant}
   y surface .surface-{light|dark}.
   ────────────────────────────────────────────────────────── */

/* Shared: every variant overlay is absolute, non-interactive, behind content */
.hero-bd {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.hero-bd > * { position: absolute; }

/* Make sure hero content sits above the backdrop in every page */
.hero-bd ~ * { position: relative; z-index: 1; }
.home-hero > div[style*="grid"] { position: relative; z-index: 1; }

/* ── 1 · Limpio · sin patrón ── */
.hero-bd.v-limpio { display: none; }

/* ── 2 · Manchas · soft brand color washes (editorial) ── */
.hero-bd.v-manchas .blob {
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  mix-blend-mode: multiply;
}
.hero-bd.v-manchas .blob.b1 {
  width: 520px; height: 520px;
  top: -120px; right: -120px;
  background: radial-gradient(circle, rgba(217,164,65,0.55) 0%, transparent 70%);
}
.hero-bd.v-manchas .blob.b2 {
  width: 460px; height: 460px;
  bottom: -180px; left: 12%;
  background: radial-gradient(circle, rgba(193,52,46,0.32) 0%, transparent 70%);
}
.hero-bd.v-manchas .blob.b3 {
  width: 380px; height: 380px;
  top: 28%; left: 32%;
  background: radial-gradient(circle, rgba(31,58,122,0.22) 0%, transparent 70%);
}

/* Surface-aware rule color — overridden on dark surfaces below */
.hero-bd {
  --rule-color: rgba(31,64,54,0.09);
  --rule-accent: rgba(193,52,46,0.28);
  --doodle-color: rgba(31,64,54,0.10);
}
.hero-bd.surface-dark {
  --rule-color: rgba(255,255,255,0.07);
  --rule-accent: rgba(217,164,65,0.45);
  --doodle-color: rgba(217,164,65,0.22);
}

/* ── 3 · Cuaderno · notebook rule lines ── */
.hero-bd.v-cuaderno {
  background-image:
    linear-gradient(to bottom, var(--rule-color) 1px, transparent 1px);
  background-size: 100% 36px;
  background-position: 0 24px;
  opacity: 0.9;
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 18%, black 82%, transparent 100%);
          mask-image: linear-gradient(to bottom, transparent 0%, black 18%, black 82%, transparent 100%);
}
.hero-bd.v-cuaderno::before {
  /* Red margin rule, like a schoolbook */
  content: "";
  position: absolute;
  left: 88px; top: 0; bottom: 0;
  width: 1px;
  background: var(--rule-accent);
}
.hero-bd.v-cuaderno::after {
  /* Three quiet punch-holes — institutional charm */
  content: "";
  position: absolute;
  left: 36px; top: 50%;
  transform: translateY(-50%);
  width: 10px; height: 220px;
  background:
    radial-gradient(circle 5px at 5px 20px, var(--doodle-color) 0 5px, transparent 6px),
    radial-gradient(circle 5px at 5px 110px, var(--doodle-color) 0 5px, transparent 6px),
    radial-gradient(circle 5px at 5px 200px, var(--doodle-color) 0 5px, transparent 6px);
}

/* ── 7 · Cuadriculado · graph paper (math notebook) ── */
.hero-bd.v-cuadriculado {
  background-image:
    linear-gradient(to right,  var(--rule-color) 1px, transparent 1px),
    linear-gradient(to bottom, var(--rule-color) 1px, transparent 1px);
  background-size: 28px 28px;
  -webkit-mask-image: radial-gradient(ellipse 85% 75% at 50% 50%, black 50%, transparent 100%);
          mask-image: radial-gradient(ellipse 85% 75% at 50% 50%, black 50%, transparent 100%);
}
.hero-bd.v-cuadriculado .grid-doodle {
  /* small math doodles in the corner: ÷, +, ×, π */
  top: 32px; right: 48px;
  width: 220px; height: 80px;
  background:
    /* + */ linear-gradient(var(--rule-accent),var(--rule-accent)) 4px 30px / 18px 2px no-repeat,
            linear-gradient(var(--rule-accent),var(--rule-accent)) 12px 22px / 2px 18px no-repeat,
    /* × */ linear-gradient(45deg,transparent 46%,var(--rule-accent) 46% 54%,transparent 54%) 58px 22px / 18px 18px no-repeat,
            linear-gradient(-45deg,transparent 46%,var(--rule-accent) 46% 54%,transparent 54%) 58px 22px / 18px 18px no-repeat,
    /* − */ linear-gradient(var(--rule-accent),var(--rule-accent)) 100px 30px / 18px 2px no-repeat,
    /* ÷ */ radial-gradient(circle 2px,var(--rule-accent) 100%,transparent 0) 148px 24px / 4px 4px no-repeat,
            radial-gradient(circle 2px,var(--rule-accent) 100%,transparent 0) 148px 36px / 4px 4px no-repeat,
            linear-gradient(var(--rule-accent),var(--rule-accent)) 138px 30px / 22px 2px no-repeat;
  opacity: 0.85;
}

/* ── 8 · Anillado · spiral notebook binding on the left ── */
.hero-bd.v-anillado {
  background-image:
    linear-gradient(to bottom, var(--rule-color) 1px, transparent 1px);
  background-size: 100% 36px;
  background-position: 64px 24px;
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 14%, black 86%, transparent 100%);
          mask-image: linear-gradient(to bottom, transparent 0%, black 14%, black 86%, transparent 100%);
}
.hero-bd.v-anillado .spine {
  top: 6%; bottom: 6%; left: 42px; width: 3px;
  background: var(--rule-accent);
  opacity: 0.6;
  border-radius: 2px;
}
.hero-bd.v-anillado .coil {
  position: absolute;
  left: 30px;
  width: 28px; height: 16px;
  border: 2px solid var(--doodle-color);
  border-radius: 50%;
  background: transparent;
  transform: rotate(-12deg);
  box-shadow: inset 0 -2px 0 var(--rule-accent);
  opacity: 0.65;
}

/* ── 9 · Banderines · string of pennants at the top ── */
.hero-bd.v-banderines {
  top: 0; left: 0; right: 0; height: 64px;
}
.hero-bd.v-banderines .pennant-string {
  position: absolute;
  top: 0; left: 0; right: 0; height: 60px;
}
.hero-bd.v-banderines .pennant-string::before {
  /* the string */
  content: "";
  position: absolute;
  top: 8px; left: 4%; right: 4%;
  height: 1px;
  background: linear-gradient(to right, transparent, rgba(31,64,54,0.35) 12%, rgba(31,64,54,0.35) 88%, transparent);
  border-radius: 1px;
}
.hero-bd.v-banderines .pennant {
  position: absolute;
  top: 8px;
  width: 0; height: 0;
  border-left: 11px solid transparent;
  border-right: 11px solid transparent;
  border-top: 28px solid currentColor;
  transform-origin: top center;
  animation: pennantSway 2.4s ease-in-out infinite;
}
.hero-bd.v-banderines .pennant.p1 { color: var(--color-brand-red);  }
.hero-bd.v-banderines .pennant.p2 { color: var(--color-brand-gold); }
.hero-bd.v-banderines .pennant.p3 { color: var(--color-brand-blue); }
.hero-bd.v-banderines .pennant.p4 { color: var(--color-brand-green); }
.hero-bd.v-banderines .pennant:nth-child(1)  { left: 6%;  }
.hero-bd.v-banderines .pennant:nth-child(2)  { left: 11%; }
.hero-bd.v-banderines .pennant:nth-child(3)  { left: 16%; }
.hero-bd.v-banderines .pennant:nth-child(4)  { left: 21%; }
.hero-bd.v-banderines .pennant:nth-child(5)  { left: 26%; }
.hero-bd.v-banderines .pennant:nth-child(6)  { left: 31%; }
.hero-bd.v-banderines .pennant:nth-child(7)  { left: 36%; }
.hero-bd.v-banderines .pennant:nth-child(8)  { left: 41%; }
.hero-bd.v-banderines .pennant:nth-child(9)  { left: 46%; }
.hero-bd.v-banderines .pennant:nth-child(10) { left: 51%; }
.hero-bd.v-banderines .pennant:nth-child(11) { left: 56%; }
.hero-bd.v-banderines .pennant:nth-child(12) { left: 61%; }
.hero-bd.v-banderines .pennant:nth-child(13) { left: 66%; }
.hero-bd.v-banderines .pennant:nth-child(14) { left: 71%; }
.hero-bd.v-banderines .pennant:nth-child(15) { left: 76%; }
.hero-bd.v-banderines .pennant:nth-child(16) { left: 81%; }
.hero-bd.v-banderines .pennant:nth-child(17) { left: 86%; }
.hero-bd.v-banderines .pennant:nth-child(18) { left: 91%; }
@keyframes pennantSway {
  0%, 100% { transform: rotate(-3deg); }
  50%      { transform: rotate(3deg); }
}

/* ── 10 · Pegatinas · school-supply stickers in corners ── */
.hero-bd.v-pegatinas .sticker {
  width: 56px; height: 56px;
  filter: drop-shadow(0 4px 10px rgba(0,0,0,0.10));
  opacity: 0.92;
}
.hero-bd.v-pegatinas .sticker.s-star {
  background: var(--color-brand-gold);
  clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
  transform: rotate(-12deg);
}
.hero-bd.v-pegatinas .sticker.s-apple {
  width: 48px; height: 52px;
  background: var(--color-brand-red);
  border-radius: 50% 50% 48% 48% / 60% 60% 40% 40%;
  transform: rotate(8deg);
  position: absolute;
}
.hero-bd.v-pegatinas .sticker.s-apple::before {
  content: ""; position: absolute;
  top: -6px; left: 50%;
  width: 3px; height: 10px;
  background: var(--color-brand-green);
  border-radius: 2px;
  transform: translateX(-50%) rotate(-10deg);
}
.hero-bd.v-pegatinas .sticker.s-apple::after {
  content: ""; position: absolute;
  top: -2px; left: calc(50% + 4px);
  width: 12px; height: 6px;
  background: var(--color-brand-green);
  border-radius: 80% 10% 80% 10% / 100% 50% 100% 50%;
  transform: rotate(28deg);
}
.hero-bd.v-pegatinas .sticker.s-dot {
  width: 36px; height: 36px;
  background: var(--color-brand-blue);
  border-radius: 50%;
  box-shadow: inset -4px -4px 0 rgba(0,0,0,0.10);
  transform: rotate(-6deg);
}
.hero-bd.v-pegatinas .sticker.s-check {
  width: 44px; height: 44px;
  background: rgba(31,138,91,0.18);
  border-radius: 12px;
  transform: rotate(-8deg);
  position: absolute;
}
.hero-bd.v-pegatinas .sticker.s-check::before {
  content: ""; position: absolute;
  inset: 0;
  background:
    linear-gradient(45deg, transparent 50%, var(--color-brand-green) 50% 60%, transparent 60%) 8px 18px / 18px 4px no-repeat,
    linear-gradient(-45deg, transparent 50%, var(--color-brand-green) 50% 60%, transparent 60%) 18px 8px / 22px 4px no-repeat;
}
.hero-bd.v-pegatinas .sticker.s-flag {
  width: 28px; height: 40px;
  background: var(--color-brand-red);
  transform: rotate(-4deg);
  clip-path: polygon(0 0, 100% 0, 100% 80%, 50% 60%, 0 80%);
  box-shadow: inset 0 -8px 0 var(--color-brand-gold);
}

/* ── 4 · Cumbres · topographic contour lines (VRAEM nod) ── */
.hero-bd.v-cumbres {
  opacity: 0.85;
}
.hero-bd.v-cumbres .ridge {
  left: 0; right: 0; bottom: 0; height: 70%;
  background:
    radial-gradient(120% 90% at 18% 100%, transparent 38%, rgba(31,64,54,0.10) 38.2%, rgba(31,64,54,0.10) 38.6%, transparent 38.8%, transparent 46%, rgba(31,64,54,0.08) 46.2%, rgba(31,64,54,0.08) 46.6%, transparent 46.8%, transparent 55%, rgba(31,64,54,0.07) 55.2%, rgba(31,64,54,0.07) 55.6%, transparent 55.8%),
    radial-gradient(140% 100% at 78% 100%, transparent 32%, rgba(217,164,65,0.16) 32.2%, rgba(217,164,65,0.16) 32.6%, transparent 32.8%, transparent 40%, rgba(217,164,65,0.13) 40.2%, rgba(217,164,65,0.13) 40.6%, transparent 40.8%, transparent 48%, rgba(217,164,65,0.10) 48.2%, rgba(217,164,65,0.10) 48.6%, transparent 48.8%, transparent 56%, rgba(217,164,65,0.08) 56.2%, rgba(217,164,65,0.08) 56.6%, transparent 56.8%);
  -webkit-mask-image: linear-gradient(to top, black 0%, black 50%, transparent 100%);
          mask-image: linear-gradient(to top, black 0%, black 50%, transparent 100%);
}
.hero-bd.v-cumbres .sky {
  top: 0; left: 0; right: 0; height: 50%;
  background: linear-gradient(180deg, rgba(31,58,122,0.05) 0%, transparent 100%);
}

/* ── 5 · Bandera · diagonal brand color block ── */
.hero-bd.v-bandera .block {
  top: 0; right: 0; bottom: 0;
  width: 38%;
  background: linear-gradient(180deg, rgba(217,164,65,0.10) 0%, rgba(217,164,65,0.18) 100%);
  -webkit-mask-image: linear-gradient(110deg, transparent 18%, black 30%);
          mask-image: linear-gradient(110deg, transparent 18%, black 30%);
}
.hero-bd.v-bandera .rule {
  top: 0; bottom: 0;
  width: 1px;
  background: rgba(31,58,122,0.18);
}
.hero-bd.v-bandera .rule.r1 { right: 38%; }
.hero-bd.v-bandera .rule.r2 { right: calc(38% - 4px); opacity: 0.5; }
.hero-bd.v-bandera::after {
  content: "VRAEM · 2017";
  position: absolute;
  top: 50%; right: 18px;
  transform: rotate(90deg) translateX(50%);
  transform-origin: right center;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.3em;
  color: rgba(31,58,122,0.5);
  text-transform: uppercase;
  white-space: nowrap;
}

/* ── 6 · Original · keep sun rays + sparkles ── */
/* (rendered via existing .bg-rays + .twinkle markup) */

@media (prefers-reduced-motion: reduce) {
  .hero-bd .blob { animation: none !important; }
}

/* Slow drift for manchas — subtle, NOT religious-sparkly */
@keyframes heroDrift1 {
  0%, 100% { transform: translate(0,0); }
  50%      { transform: translate(28px,-18px); }
}
@keyframes heroDrift2 {
  0%, 100% { transform: translate(0,0); }
  50%      { transform: translate(-22px,16px); }
}
@keyframes heroDrift3 {
  0%, 100% { transform: translate(0,0); }
  50%      { transform: translate(14px,22px); }
}
.hero-bd.v-manchas .blob.b1 { animation: heroDrift1 18s ease-in-out infinite; }
.hero-bd.v-manchas .blob.b2 { animation: heroDrift2 22s ease-in-out infinite; }
.hero-bd.v-manchas .blob.b3 { animation: heroDrift3 26s ease-in-out infinite; }