/* ════════════════════════════════════════════════
   libro.css — páginas de venta de ebooks MATIWLOG
   Compartido por libro-importaciones / libro-ia / libro-drones
   ════════════════════════════════════════════════ */

* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #0c0c14;
  --bg-card: #13131e;
  --bg-elevated: #181825;
  --border: rgba(255,255,255,0.08);
  --border-hover: rgba(255,255,255,0.16);
  --text: #ededf2;
  --text-soft: #b8b8cc;
  --text-dim: #707090;
  --cyan: #06d6a0;
  --cyan-bright: #00f5b8;
  --amber: #f4a261;
  --amber-bright: #ffb347;
  --ocean: #00b4d8;
  --gold: #FFCE00;
  --radius: 18px;
  --radius-sm: 12px;
  /* acento por libro — se sobreescribe en cada página */
  --accent: var(--cyan);
  --accent-glow: rgba(6,214,160,0.18);
}

html { overflow-x: hidden; width: 100%; scroll-behavior: smooth; }
body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
.mono { font-family: 'JetBrains Mono', monospace; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 760px; }

/* ─── NAV ─── */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(12,12,20,0.82); backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { max-width: 1080px; margin: 0 auto; padding: 14px 24px; display: flex; align-items: center; justify-content: space-between; }
.nav-logo { font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 20px; letter-spacing: -0.5px; color: var(--text); }
.nav-logo .w { color: var(--cyan); }
.nav-back { font-family: 'JetBrains Mono', monospace; font-size: 13px; color: var(--text-dim); }
.nav-back:hover { color: var(--text); }

/* ─── HERO ─── */
.hero { padding: 64px 0 56px; position: relative; }
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 56px; align-items: center; }
.eyebrow { font-family: 'JetBrains Mono', monospace; font-size: 12px; letter-spacing: 3px; text-transform: uppercase; color: var(--accent); margin-bottom: 18px; }
.hero h1 { font-family: 'Space Grotesk', sans-serif; font-size: clamp(34px, 5.2vw, 54px); line-height: 1.02; letter-spacing: -1.6px; margin-bottom: 18px; }
.hero h1 .hl { color: var(--accent); }
.hero .promise { font-size: 18px; color: var(--text-soft); max-width: 540px; margin-bottom: 28px; }

/* precio + compra */
.buybox { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; margin-bottom: 18px; }
.price-row { display: flex; align-items: baseline; gap: 14px; margin-bottom: 6px; }
.price-now { font-family: 'Space Grotesk', sans-serif; font-size: 38px; font-weight: 700; color: var(--text); letter-spacing: -1px; }
.price-now small { font-size: 15px; color: var(--text-dim); font-weight: 500; }
.price-usd { font-family: 'JetBrains Mono', monospace; font-size: 13px; color: var(--text-dim); }
.price-note { font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--text-dim); margin-bottom: 18px; }
.btn-buy {
  display: block; width: 100%; text-align: center;
  background: linear-gradient(135deg, var(--accent), var(--cyan-bright));
  color: #07140f; font-weight: 800; font-size: 17px;
  padding: 17px 24px; border-radius: var(--radius-sm);
  font-family: 'Space Grotesk', sans-serif; letter-spacing: -0.3px;
  transition: transform .15s ease, box-shadow .15s ease;
  box-shadow: 0 10px 30px -10px var(--accent-glow);
}
.btn-buy:hover { transform: translateY(-2px); box-shadow: 0 16px 40px -12px var(--accent-glow); }
.btn-buy.amber { background: linear-gradient(135deg, var(--amber), var(--amber-bright)); color: #1a0d05; }
.btn-buy.ocean { background: linear-gradient(135deg, var(--ocean), #48cae4); color: #04181f; }
.buy-trust { font-family: 'JetBrains Mono', monospace; font-size: 11.5px; color: var(--text-dim); margin-top: 12px; text-align: center; line-height: 1.6; }
.hero-secondary { font-family: 'JetBrains Mono', monospace; font-size: 13px; color: var(--text-dim); }
.hero-secondary a { color: var(--text-soft); border-bottom: 1px solid var(--border-hover); }

/* ─── BOOK COVER ─── */
.book-cover {
  aspect-ratio: 3/4; border-radius: 14px; padding: 30px 26px;
  display: flex; flex-direction: column; justify-content: space-between;
  border: 1px solid rgba(255,255,255,0.12);
  box-shadow: 0 30px 60px -20px rgba(0,0,0,0.7), inset 0 1px 0 rgba(255,255,255,0.08);
  position: relative; overflow: hidden;
  max-width: 340px; margin: 0 auto; width: 100%;
}
.book-cover::after { content: ''; position: absolute; right: 0; top: 0; bottom: 0; width: 6px; background: rgba(0,0,0,0.35); }
.book-cover .bc-tag { font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: 2px; color: rgba(255,255,255,0.7); }
.book-cover .bc-title { font-family: 'Space Grotesk', sans-serif; font-size: 34px; font-weight: 700; line-height: 1.0; letter-spacing: -1px; color: #fff; }
.book-cover .bc-sub { font-size: 13px; color: rgba(255,255,255,0.85); margin-top: 10px; line-height: 1.4; }
.book-cover .bc-bottom { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: rgba(255,255,255,0.7); border-top: 1px solid rgba(255,255,255,0.2); padding-top: 12px; }

/* ─── SECTIONS ─── */
.section { padding: 56px 0; border-top: 1px solid var(--border); }
.section-tag { font-family: 'JetBrains Mono', monospace; font-size: 12px; letter-spacing: 2px; text-transform: uppercase; color: var(--accent); margin-bottom: 14px; }
.section h2 { font-family: 'Space Grotesk', sans-serif; font-size: clamp(26px, 3.6vw, 36px); letter-spacing: -1px; line-height: 1.08; margin-bottom: 18px; }
.section h2 .hl { color: var(--accent); }
.section p.lead { font-size: 17px; color: var(--text-soft); max-width: 680px; }

/* autor */
.author { display: flex; gap: 22px; align-items: center; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; }
.author img { width: 84px; height: 84px; border-radius: 50%; object-fit: cover; border: 2px solid var(--accent); flex-shrink: 0; }
.author .a-name { font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 19px; }
.author .a-role { font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--accent); margin: 4px 0 10px; }
.author p { font-size: 14.5px; color: var(--text-soft); }

/* para quien (niveles) */
.levels { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 8px; }
.level-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; transition: border-color .2s; }
.level-card:hover { border-color: var(--accent); }
.level-card .lvl-icon { font-size: 28px; margin-bottom: 12px; }
.level-card h3 { font-family: 'Space Grotesk', sans-serif; font-size: 18px; margin-bottom: 8px; }
.level-card p { font-size: 14px; color: var(--text-soft); }
.level-card .lvl-caps { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--accent); margin-top: 12px; }

/* incluye / formato */
.includes { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.inc-item { display: flex; gap: 12px; align-items: flex-start; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px 18px; }
.inc-item .ic { color: var(--accent); font-weight: 800; flex-shrink: 0; }
.inc-item span.t { font-size: 14.5px; color: var(--text-soft); }
.inc-item b { color: var(--text); }

/* indice */
.toc { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px 32px; counter-reset: ch; }
.toc-part { font-family: 'JetBrains Mono', monospace; font-size: 12px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--accent); margin: 24px 0 10px; }
.toc-part:first-child { margin-top: 0; }
.toc ol { list-style: none; }
.toc li { counter-increment: ch; display: flex; gap: 14px; padding: 9px 0; border-bottom: 1px solid var(--border); font-size: 15px; color: var(--text-soft); align-items: baseline; }
.toc li:last-child { border-bottom: none; }
.toc li::before { content: counter(ch, decimal-leading-zero); font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--text-dim); min-width: 26px; }
.toc li .ready { font-family: 'JetBrains Mono', monospace; font-size: 10px; color: var(--accent); border: 1px solid var(--accent); border-radius: 20px; padding: 1px 8px; margin-left: auto; white-space: nowrap; }
.toc-apx { font-size: 13px; color: var(--text-dim); margin-top: 20px; font-family: 'JetBrains Mono', monospace; }
.toc-note { font-size: 13px; color: var(--text-dim); margin-top: 18px; line-height: 1.6; }

/* garantia */
.guarantee { background: linear-gradient(135deg, rgba(6,214,160,0.06), rgba(244,162,97,0.05)); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; text-align: center; }
.guarantee .g-icon { font-size: 38px; margin-bottom: 12px; }
.guarantee h3 { font-family: 'Space Grotesk', sans-serif; font-size: 22px; margin-bottom: 10px; }
.guarantee p { font-size: 15px; color: var(--text-soft); max-width: 560px; margin: 0 auto; }

/* faq */
.faq-item { border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 4px 20px; margin-bottom: 12px; background: var(--bg-card); }
.faq-item summary { font-family: 'Space Grotesk', sans-serif; font-weight: 600; font-size: 16px; padding: 16px 0; cursor: pointer; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; color: var(--accent); font-size: 22px; line-height: 1; }
.faq-item[open] summary::after { content: '−'; }
.faq-item p { font-size: 14.5px; color: var(--text-soft); padding: 0 0 18px; }

/* cta final */
.final-cta { text-align: center; }
.final-cta .buybox { max-width: 460px; margin: 26px auto 0; }

/* cross-sell */
.cross { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 8px; }
.cross-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; transition: transform .15s, border-color .2s; }
.cross-card:hover { transform: translateY(-3px); border-color: var(--border-hover); }
.cross-card .cc-tag { font-family: 'JetBrains Mono', monospace; font-size: 11px; letter-spacing: 1px; margin-bottom: 8px; }
.cross-card h3 { font-family: 'Space Grotesk', sans-serif; font-size: 18px; margin-bottom: 8px; line-height: 1.1; }
.cross-card p { font-size: 13.5px; color: var(--text-soft); margin-bottom: 14px; }
.cross-card .cc-price { font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 17px; }
.cross-card .cc-link { font-family: 'JetBrains Mono', monospace; font-size: 12px; color: var(--text-dim); display: block; margin-top: 10px; }
.cross-pack { grid-column: 1 / -1; background: linear-gradient(135deg, rgba(244,162,97,0.1), rgba(6,214,160,0.08)); border-color: var(--amber); display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 18px; }
.cross-pack .cp-left h3 { font-size: 22px; margin-bottom: 6px; }
.cross-pack .cp-left p { margin-bottom: 0; }
.cross-pack .cp-price { font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 26px; color: var(--amber); }
.cross-pack .cp-price small { font-size: 13px; color: var(--text-dim); text-decoration: line-through; display: block; }

/* footer */
.footer { border-top: 1px solid var(--border); padding: 40px 0; text-align: center; font-family: 'JetBrains Mono', monospace; font-size: 13px; color: var(--text-dim); }
.footer a { color: var(--text-soft); }
.footer .f-links { margin-bottom: 14px; display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; }

/* ─── RESPONSIVE ─── */
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { order: -1; }
  .book-cover { max-width: 280px; }
  .levels, .cross { grid-template-columns: 1fr; }
  .includes { grid-template-columns: 1fr; }
  .author { flex-direction: column; text-align: center; }
  .cross-pack { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) {
  .hero { padding: 40px 0 36px; }
  .section { padding: 44px 0; }
  .toc { padding: 24px 20px; }
}