/* Layout: portada de una columna con un hero partido (tesis + pentagrama corregido), y debajo
   tres bloques de lectura: qué hace distinto, qué ejercicios hay, quién está detrás. */
:root {
  --bg: #FAF9F8;
  --surface: #FFFFFF;
  --line: #E4E2DE;
  --line-strong: #CBC8C3;
  --ink: #121213;
  --ink-2: #585652;
  --ink-3: #7A7772;
  --staff: #3D3B38;
  --brand: #DB0934;
  --brand-hover: #B6072B;
  --on-brand: #FFFFFF;
  --ok: #0F6E56; --ok-bg: #E3F4EE; --ok-text: #0A4C3B;
  --fail: #C2410C; --fail-bg: #FDEDE4; --fail-text: #8A2E08;
  --warm-bg: #FEF4E2; --warm-text: #7A4E04;
  --focus: #ED3157;
  --font-display: 'Playfair Display', 'Iowan Old Style', Georgia, serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-music: 'Noto Music', 'Apple Symbols', 'Segoe UI Symbol', serif;
}
@media (prefers-color-scheme: dark) { :root {
  --bg: #121213; --surface: #1B1A1A; --line: #3D3B38; --line-strong: #585652;
  --ink: #FAF9F8; --ink-2: #CBC8C3; --ink-3: #A5A29C; --staff: #CBC8C3;
  --brand: #ED3157; --brand-hover: #F36884; --on-brand: #121213;
  --ok: #5FC2A3; --ok-bg: #0E2A22; --ok-text: #A8E3D0;
  --fail: #F08A5D; --fail-bg: #2E1A10; --fail-text: #F9C4A8;
  --warm-bg: #2C2210; --warm-text: #F5CD7E;
  color-scheme: dark; } }
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 1rem/1.6 var(--font-sans); padding-inline: 20px; }
a { color: inherit; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; border-radius: 4px; }
.wrap { max-width: 1040px; margin: 0 auto; }

/* Cabecera */
.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 22px; }
.mark { display: inline-flex; align-items: baseline; gap: 8px; text-decoration: none; }
.mark b { font: 700 1.5rem/1 var(--font-display); letter-spacing: -.01em; }
.mark span { font-family: var(--font-music); font-size: 1.35rem; line-height: 1; color: var(--ink-2); }
.top nav { display: flex; gap: 20px; flex-wrap: wrap; }
.top nav a { text-decoration: none; font: 500 .9375rem/1 var(--font-sans); color: var(--ink-2); }
.top nav a:hover { color: var(--ink); }

/* Hero */
.hero { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: 48px; align-items: center; padding-block: 40px 72px; }
.eyebrow { font: 500 .75rem/1.4 var(--font-sans); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); margin: 0 0 14px; }
h1 { font: 700 clamp(2.4rem, 5.2vw, 3.6rem)/1.06 var(--font-display); letter-spacing: -.02em; margin: 0 0 20px; text-wrap: balance; }
h1 em { font-style: italic; font-weight: 500; }
.lead { font-size: 1.125rem; line-height: 1.65; color: var(--ink-2); margin: 0 0 28px; max-width: 46ch; }
.cta-row { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.cta { display: inline-block; background: var(--brand); color: var(--on-brand); text-decoration: none; font: 700 1rem/1 var(--font-sans); padding: 15px 22px; border-radius: 10px; }
.cta:hover { background: var(--brand-hover); }
.cta-note { font-size: .875rem; color: var(--ink-3); }

/* La pieza del hero: un pentagrama con un fallo explicado, tal como sale en el ejercicio */
.specimen { margin: 0; background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 18px 18px 16px; display: flex; flex-direction: column; gap: 12px; box-shadow: 0 1px 0 var(--line), 0 18px 40px -28px rgba(18, 18, 19, .35); }
.specimen-top { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.specimen-top b { font: 700 1rem/1.3 var(--font-sans); }
.specimen-top span { font: 500 .75rem/1.3 var(--font-sans); color: var(--ink-3); }
svg.staff { width: 100%; height: auto; display: block; }
.staff line { stroke: var(--staff); stroke-width: 1.4; }
.staff .clef { fill: var(--staff); font-family: var(--font-music); }
.staff .head { fill: var(--fail); }
.staff .hole { fill: var(--surface); }
.staff .ghost { fill: none; stroke: var(--fail); stroke-width: 2; stroke-dasharray: 4 3; }
.staff .lbl { fill: var(--fail); font: 700 12px var(--font-sans); }
.answers { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 5px; }
.answers span { text-align: center; font: 700 .875rem/1 var(--font-sans); padding: 10px 0; border-radius: 8px; border: 1px solid var(--line-strong); color: var(--ink-3); }
.answers .is-ok { background: var(--ok-bg); border-color: var(--ok); color: var(--ok-text); }
.answers .is-fail { background: var(--fail-bg); border-color: var(--fail); color: var(--fail-text); }
.why { background: var(--fail-bg); color: var(--fail-text); border-radius: 10px; padding: 12px 14px; font-size: .9375rem; line-height: 1.5; }
.why p { margin: 0; }
.why p + p { margin-top: 6px; }
.why b { font-weight: 700; }

/* Bloques */
section.block { border-top: 1px solid var(--line); padding-block: 56px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 40px; }
section.block h2 { font: 700 1.75rem/1.2 var(--font-display); letter-spacing: -.01em; margin: 0; text-wrap: balance; }
.block-body { min-width: 0; }
.points { list-style: none; margin: 0; padding: 0; display: grid; gap: 26px; }
.points li { display: grid; grid-template-columns: 42px minmax(0, 1fr); gap: 14px; align-items: start; }
.points .glyph { font-family: var(--font-music); font-size: 1.9rem; line-height: 1; color: var(--ink-2); text-align: center; padding-top: 2px; }
.points h3 { font: 700 1.125rem/1.35 var(--font-sans); margin: 0 0 4px; }
.points p { margin: 0; color: var(--ink-2); max-width: 60ch; }

.exercises { list-style: none; margin: 0; padding: 0; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; background: var(--surface); }
.exercises li { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 16px 18px; border-top: 1px solid var(--line); flex-wrap: wrap; }
.exercises li:first-child { border-top: 0; }
.exercises .name { font: 700 1rem/1.4 var(--font-sans); }
.exercises .desc { display: block; font: 400 .875rem/1.5 var(--font-sans); color: var(--ink-3); }
.exercises a.name { text-decoration: none; }
.exercises a.name:hover { text-decoration: underline; }
.state { font: 500 .75rem/1 var(--font-sans); padding: 6px 10px; border-radius: 999px; white-space: nowrap; }
.state.open { background: var(--ok-bg); color: var(--ok-text); }
.state.soon { background: var(--warm-bg); color: var(--warm-text); }

.prose p { margin: 0 0 14px; color: var(--ink-2); max-width: 62ch; }
.prose p:last-child { margin-bottom: 0; }
.prose a { color: var(--ink); text-underline-offset: 3px; }

footer { border-top: 1px solid var(--line); padding-block: 26px 40px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: .8125rem; color: var(--ink-3); }

@media (max-width: 820px) {
  .hero { grid-template-columns: minmax(0, 1fr); gap: 36px; padding-block: 20px 56px; }
  section.block { grid-template-columns: minmax(0, 1fr); gap: 22px; padding-block: 44px; }
}
@media (max-width: 480px) {
  body { padding-inline: 16px; }
  .top nav a.hide-sm { display: none; }
  .answers span { font-size: .8125rem; padding: 9px 0; }
}

/* Selector de idioma: discreto, a la derecha de la cabecera */
.top nav.langs { gap: 2px; }
.top nav.langs a { font: 500 .8125rem/1 var(--font-sans); padding: 6px 7px; border-radius: 6px; color: var(--ink-3); letter-spacing: .03em; }
.top nav.langs a[aria-current] { color: var(--ink); font-weight: 700; }
.top-right { display: flex; align-items: center; gap: 18px; }