:root {
  --ink: #17191c;
  --paper: #f4f2ed;
  --white: #fff;
  --muted: #667078;
  --yellow: #f7c928;
  --orange: #e47d2b;
  --line: #dfe1dd;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: 'DM Sans', Arial, sans-serif;
  line-height: 1.65;
}

body::before {
  content: '';
  display: block;
  min-height: 300px;
  background: linear-gradient(90deg, rgba(23,25,28,.9), rgba(23,25,28,.25)), var(--article-cover) center/cover;
}

body.article-1 { --article-cover: url('imagenes/imagen2.jpeg'); }
body.article-2 { --article-cover: url('imagenes/imagen3.jpeg'); }
body.article-3 { --article-cover: url('imagenes/imagen4.jpeg'); }
body.article-4 { --article-cover: url('imagenes/imagen5.jpeg'); }
body.article-5 { --article-cover: url('imagenes/imagen6.jpeg'); }
body.article-6 { --article-cover: url('imagenes/imagen7.jpeg'); }

h1, h2 { font-family: 'Space Grotesk', Arial, sans-serif; line-height: 1.1; letter-spacing: -.035em; }
h1 {
  position: relative;
  max-width: 980px;
  margin: -155px auto 48px;
  padding: 0 30px;
  color: var(--white);
  font-size: clamp(2.5rem, 6vw, 5.5rem);
}

.content {
  max-width: 980px;
  margin: 0 auto 70px;
  padding: clamp(28px, 5vw, 65px);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: 0 18px 50px rgba(23,25,28,.1);
}

.content h2 { margin: 8px 0 15px; color: var(--ink); font-size: clamp(1.5rem, 3vw, 2.35rem); }
.content p, .content li { color: var(--muted); font-size: 1.04rem; }
.content ul { padding-left: 22px; margin-bottom: 34px; }
.content li { margin: 8px 0; }
.content li::marker { color: var(--orange); }
.content h2:nth-of-type(1)::before, .content h2:nth-of-type(2)::before { content: ''; display: inline-block; width: 25px; height: 3px; margin: 0 11px 7px 0; border-radius: 10px; background: var(--yellow); }

iframe { display: block; width: 100%; aspect-ratio: 16 / 9; height: auto; margin-top: 22px; border: 0; border-radius: 17px; background: var(--ink); box-shadow: 0 12px 30px rgba(23,25,28,.14); }
.back-link { display: inline-flex; align-items: center; margin-top: 30px; padding: 13px 20px; border-radius: 999px; background: var(--yellow); color: var(--ink); font-weight: 700; text-decoration: none; transition: transform .2s ease, background .2s ease; }
.back-link::before { content: '←'; margin-right: 8px; }
.back-link:hover { background: #ffd94a; transform: translateY(-2px); }

@media (max-width: 720px) {
  body::before { min-height: 230px; }
  h1 { margin: -120px auto 34px; padding: 0 18px; font-size: clamp(2.2rem, 12vw, 4rem); }
  .content { width: calc(100% - 28px); margin-bottom: 36px; padding: 28px 20px; border-radius: 18px; }
  .content p, .content li { font-size: .98rem; }
}