/* Pianistech — theory / resources (cozy pastel, matches homepage) */
:root {
  --bg: #fff6f0;
  --surface: #fffaf7;
  --text: #4a3a32;
  --muted: #7a6558;
  --muted2: #9a8476;
  --coral: #e89a8c;
  --coral-deep: #d47868;
  --coral-soft: #fce8e2;
  --mint: #7eb8a2;
  --mint-deep: #5a9a82;
  --mint-soft: #e4f3ec;
  --border: rgba(120, 90, 70, 0.12);
  --shadow: 0 12px 36px rgba(120, 80, 60, 0.08);
  --radius: 28px;
  --max: 760px;
  --font: "Nunito", ui-rounded, system-ui, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}
body::before {
  content: "";
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(900px 480px at 12% -6%, rgba(247, 217, 200, 0.85), transparent 58%),
    radial-gradient(820px 440px at 92% 4%, rgba(228, 243, 236, 0.75), transparent 52%),
    linear-gradient(168deg, #fff8f3 0%, #fff3eb 42%, #f9efe8 100%);
}
a { color: inherit; }
.topbar {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(255, 248, 243, 0.86);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none;
}
.brand img { display: none; }
.brand > span:not(.brand-mark) { display: none; }
.brand-mark {
  font-weight: 900;
  font-size: 22px;
  letter-spacing: -0.6px;
  line-height: 1;
}
.brand-mark .bm-a { color: var(--coral); }
.brand-mark .bm-b { color: var(--mint); }
.topbar-right { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.topbar-right a {
  text-decoration: none;
  font-size: 14px; font-weight: 800;
  padding: 9px 13px; border-radius: 999px;
  color: var(--muted);
}
.topbar-right a:hover { background: rgba(232, 154, 140, 0.14); color: var(--text); }
.lang-toggle {
  display: inline-flex; padding: 4px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--surface);
}
.lang-toggle button {
  border: 0; background: transparent; color: var(--muted2);
  font: inherit; font-size: 12px; font-weight: 800;
  padding: 7px 12px; border-radius: 999px; cursor: pointer;
}
.lang-toggle button.is-active { background: var(--coral); color: #fff; }

.article-wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 36px 20px 72px;
}
.crumb {
  font-size: 13px; color: var(--muted2); margin: 0 0 18px; font-weight: 700;
}
.crumb a { color: var(--mint-deep); text-decoration: none; font-weight: 800; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; font-weight: 800; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--mint-deep); margin: 0 0 12px;
}
h1 {
  margin: 0 0 14px;
  font-size: clamp(34px, 5.5vw, 48px);
  line-height: 1.08;
  letter-spacing: -1px;
  font-weight: 900;
}
.lead {
  margin: 0 0 24px;
  font-size: 19px;
  color: var(--muted);
  font-weight: 700;
}
.article-body h2 {
  margin: 36px 0 12px;
  font-size: 26px;
  letter-spacing: -0.4px;
  font-weight: 900;
}
.article-body p { margin: 0 0 14px; color: var(--text); font-weight: 600; }
.article-body ul {
  margin: 0 0 18px;
  padding-left: 1.2em;
  color: var(--text);
  font-weight: 600;
}
.article-body li { margin: 0 0 8px; }
.article-body strong { color: var(--text); }
.cta-box {
  margin: 28px 0;
  padding: 20px;
  border-radius: var(--radius);
  border: 1px solid rgba(126, 184, 162, 0.28);
  background: var(--mint-soft);
  box-shadow: var(--shadow);
}
.cta-box p { margin: 0 0 12px; color: var(--muted); font-weight: 700; }
.cta-row { display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 18px; border-radius: 999px;
  text-decoration: none; font-weight: 800; font-size: 15px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 2px 10px rgba(120, 80, 60, 0.06);
}
.btn:hover { background: #fff; }
.btn-green { border-color: transparent; background: var(--mint); color: #fff; }
.btn-green:hover { background: var(--mint-deep); color: #fff; }
.btn-pink { border-color: transparent; background: var(--coral); color: #fff; }
.btn-pink:hover { background: var(--coral-deep); color: #fff; }

.hub-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 28px;
}
@media (max-width: 700px) { .hub-grid { grid-template-columns: 1fr; } }
.hub-card {
  display: block;
  padding: 22px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: #fff;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.hub-card:hover {
  border-color: rgba(232, 154, 140, 0.35);
  transform: translateY(-3px);
  box-shadow: 0 18px 44px rgba(120, 80, 60, 0.12);
}
.hub-card h2 { margin: 0 0 8px; font-size: 22px; font-weight: 900; }
.hub-card p { margin: 0; color: var(--muted2); font-size: 15px; font-weight: 600; }
.hub-tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11px; font-weight: 800; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--mint-deep);
  background: var(--mint-soft);
  border: 1px solid rgba(126, 184, 162, 0.28);
}

.pt-ad:empty,
.pt-ad.is-placeholder {
  display: none !important;
  min-height: 0 !important;
  margin: 0 !important;
  border: 0 !important;
}
.pt-ad {
  border-color: rgba(120, 90, 70, 0.14) !important;
  background: rgba(255, 255, 255, 0.55) !important;
  border-radius: 22px !important;
}
.pt-ad-placeholder { color: rgba(120, 90, 70, 0.35) !important; }
.pt-ad-placeholder small { color: rgba(120, 90, 70, 0.25) !important; }

.pt-amz-disc {
  margin: 0 0 16px;
  font-size: 13px;
  font-weight: 700;
  color: var(--muted2);
  line-height: 1.45;
}
.pt-amz-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 0 0 8px;
}
@media (max-width: 800px) {
  .pt-amz-grid { grid-template-columns: 1fr; }
}
.pt-amz-card {
  padding: 18px;
  border-radius: 22px;
  border: 1px solid var(--border);
  background: #fff;
  box-shadow: var(--shadow);
}
.pt-amz-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 900;
}
.pt-amz-card p {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
}
.pt-amz-card .btn { width: 100%; justify-content: center; }

footer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 20px 48px;
  border-top: 1px solid var(--border);
  color: var(--muted2);
  font-size: 14px;
  font-weight: 700;
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
}
footer a { text-decoration: none; color: var(--muted); }
footer a:hover { text-decoration: underline; color: var(--text); }

html[lang="es"] [data-lang="en"] { display: none !important; }
html[lang="en"] [data-lang="es"] { display: none !important; }