/* Encabezado compartido — todas las secciones del blog */

:root {
  --section-bg: #0a0b0d;
  --section-border: rgba(255, 255, 255, 0.1);
  --section-text: #e4e8ef;
  --section-muted: #9aa3b2;
  --hero-primary: #23f0ec;
  --hero-accent: #23f0ec;
  --hero-glow-1: rgba(35, 240, 236, 0.1);
  --hero-glow-2: rgba(35, 240, 236, 0.06);
  --hero-tint-a: rgba(35, 240, 236, 0.12);
  --hero-tint-b: rgba(35, 240, 236, 0.08);
  --hero-img-position: center 35%;
}

.theme-blog {
  --hero-primary: #ff014f;
  --hero-accent: #23f0ec;
  --hero-glow-1: rgba(255, 1, 79, 0.14);
  --hero-glow-2: rgba(35, 240, 236, 0.08);
  --hero-tint-a: rgba(255, 1, 79, 0.12);
  --hero-tint-b: rgba(35, 240, 236, 0.08);
}

.theme-algo {
  --hero-primary: #ff014f;
  --hero-accent: #23f0ec;
  --hero-glow-1: rgba(255, 1, 79, 0.14);
  --hero-glow-2: rgba(35, 240, 236, 0.08);
  --hero-tint-a: rgba(255, 1, 79, 0.12);
  --hero-tint-b: rgba(35, 240, 236, 0.08);
}

.theme-bio {
  --hero-primary: #22c55e;
  --hero-accent: #23f0ec;
  --hero-glow-1: rgba(34, 197, 94, 0.14);
  --hero-glow-2: rgba(35, 240, 236, 0.07);
  --hero-tint-a: rgba(34, 197, 94, 0.12);
  --hero-tint-b: rgba(35, 240, 236, 0.08);
}

.theme-math {
  --hero-primary: #818cf8;
  --hero-accent: #23f0ec;
  --hero-glow-1: rgba(129, 140, 248, 0.16);
  --hero-glow-2: rgba(35, 240, 236, 0.07);
  --hero-tint-a: rgba(129, 140, 248, 0.14);
  --hero-tint-b: rgba(35, 240, 236, 0.08);
  --hero-img-position: center 40%;
}

.theme-physics {
  --hero-primary: #f59e0b;
  --hero-accent: #38bdf8;
  --hero-glow-1: rgba(245, 158, 11, 0.16);
  --hero-glow-2: rgba(56, 189, 248, 0.08);
  --hero-tint-a: rgba(245, 158, 11, 0.14);
  --hero-tint-b: rgba(56, 189, 248, 0.08);
  --hero-img-position: center 45%;
}

.section-hero {
  position: relative;
  overflow: hidden;
  padding: 28px 24px 72px;
  min-height: min(72vh, 560px);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  border-bottom: 1px solid var(--section-border, rgba(255, 255, 255, 0.1));
}

.section-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.section-hero__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: var(--hero-img-position);
  display: block;
}

.section-hero__overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg,
      rgba(10, 11, 13, 0.55) 0%,
      rgba(10, 11, 13, 0.72) 45%,
      rgba(10, 11, 13, 0.94) 100%),
    linear-gradient(135deg,
      var(--hero-tint-a) 0%,
      transparent 50%,
      var(--hero-tint-b) 100%);
}

.section-hero__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
  z-index: 1;
  opacity: 0.5;
}

.section-hero__glow--1 {
  width: 400px;
  height: 400px;
  top: -100px;
  right: 5%;
  background: var(--hero-glow-1);
}

.section-hero__glow--2 {
  width: 320px;
  height: 320px;
  bottom: -80px;
  left: 0;
  background: var(--hero-glow-2);
}

.section-nav {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto 48px;
  width: 100%;
}

.section-nav a {
  color: var(--hero-accent);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: color 0.25s ease, border-color 0.25s ease, background 0.25s ease;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(10, 11, 13, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
}

.section-nav a:hover {
  color: #fff;
  border-color: rgba(35, 240, 236, 0.4);
  background: rgba(10, 11, 13, 0.65);
}

.section-nav .nav-sep {
  display: none;
}

.section-hero__inner {
  position: relative;
  z-index: 2;
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
  padding: 0 8px;
  width: 100%;
}

.section-hero__inner--wide {
  max-width: 1200px;
}

.section-hero__eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--hero-primary);
}

.section-hero__title {
  margin: 0 0 16px;
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: #fff;
  line-height: 1.08;
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.45);
}

.section-hero__desc {
  margin: 0 auto 32px;
  max-width: 540px;
  font-size: 17px;
  color: rgba(228, 232, 239, 0.88);
  line-height: 1.65;
  text-shadow: 0 1px 12px rgba(0, 0, 0, 0.5);
}

.section-hero__stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.section-stat {
  padding: 14px 22px;
  border-radius: 14px;
  background: rgba(10, 11, 13, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.12);
  min-width: 110px;
  backdrop-filter: blur(10px);
}

.section-stat strong {
  display: block;
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--hero-accent);
  line-height: 1.1;
}

.section-stat span {
  font-size: 12px;
  color: var(--section-muted, #9aa3b2);
  font-weight: 500;
}

.section-hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--hero-primary), #cc0039);
  color: #fff !important;
  text-decoration: none;
  font-size: 15px;
  font-weight: 700;
  box-shadow: 0 8px 32px rgba(255, 1, 79, 0.35);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.theme-physics .section-hero__cta {
  background: linear-gradient(135deg, var(--hero-primary), #d97706);
  box-shadow: 0 8px 32px rgba(245, 158, 11, 0.35);
}

.theme-bio .section-hero__cta {
  background: linear-gradient(135deg, var(--hero-primary), #059669);
  box-shadow: 0 8px 32px rgba(34, 197, 94, 0.35);
}

.theme-math .section-hero__cta {
  background: linear-gradient(135deg, var(--hero-primary), #6366f1);
  box-shadow: 0 8px 32px rgba(129, 140, 248, 0.35);
}

.section-hero__cta:hover {
  transform: translateY(-2px);
  color: #fff !important;
}

.section-back-home {
  position: relative;
  z-index: 2;
  display: inline-block;
  margin: 0 auto 24px;
  max-width: 1200px;
  width: 100%;
  padding: 0 8px;
  color: var(--hero-accent) !important;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
}

.section-back-home:hover {
  color: #fff !important;
}

@media (max-width: 640px) {
  .section-hero {
    padding: 20px 16px 56px;
    min-height: min(68vh, 480px);
  }

  .section-nav {
    margin-bottom: 32px;
  }
}