:root {
  --ink: #071019;
  --paper: #f4f7f5;
  --muted: #667278;
  --line: rgba(7, 16, 25, .12);
  --accent: #ffb36b;
  --accent-strong: #e87843;
  --soft: #dce9e4;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Manrope, system-ui, sans-serif;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

body[data-theme="de"] {
  --accent: #f1a55e;
  --accent-strong: #bf6849;
  --soft: #dce9df;
}

a { color: inherit; }
img { display: block; max-width: 100%; }
.skip-link { position: absolute; left: 1rem; top: -5rem; z-index: 20; padding: .7rem 1rem; color: var(--ink); background: var(--accent); border-radius: 999px; }
.skip-link:focus { top: 1rem; }
.shell { width: min(calc(100% - 2.5rem), var(--max)); margin-inline: auto; }

.hero {
  position: relative;
  min-height: min(820px, 92vh);
  display: grid;
  align-items: center;
  isolation: isolate;
  color: #f6faf8;
  background: #071019 center / cover no-repeat;
  overflow: hidden;
}
.hero::before { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(90deg, rgba(3, 10, 17, .92) 0%, rgba(3, 10, 17, .73) 38%, rgba(3, 10, 17, .12) 78%, rgba(3, 10, 17, .42) 100%); }
.hero::after { content: ""; position: absolute; inset: auto 0 0; height: 180px; z-index: -1; background: linear-gradient(transparent, rgba(7,16,25,.35)); }
.hero--en { background-image: url('ai-music/assets/ai-music-hero.png'); }
.hero--de { background-image: url('ki-musik/assets/ki-musik-hero.png'); }
.topbar { position: absolute; inset: 0 0 auto; padding: 1.3rem 0; }
.topbar__inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.brand { color: #fff; font: 700 .83rem/1 Space Grotesk, sans-serif; letter-spacing: .17em; text-decoration: none; text-transform: uppercase; }
.topbar nav { display: flex; gap: 1.2rem; align-items: center; font-size: .78rem; }
.topbar nav a { color: rgba(255,255,255,.78); text-decoration: none; }
.topbar nav a:hover, .topbar nav a:focus-visible { color: #fff; }
.hero__content { padding: 8rem 0 6rem; max-width: 740px; }
.eyebrow { margin: 0 0 1.3rem; color: var(--accent); font: 500 .74rem/1 DM Mono, monospace; letter-spacing: .18em; text-transform: uppercase; }
h1, h2, h3 { margin: 0; font-family: "Space Grotesk", sans-serif; letter-spacing: -.045em; }
h1 { max-width: 850px; font-size: clamp(3rem, 7vw, 6.9rem); line-height: .96; }
.hero__lead { max-width: 630px; margin: 1.7rem 0 2rem; color: rgba(246,250,248,.84); font-size: clamp(1.05rem, 1.6vw, 1.3rem); }
.hero__meta { display: flex; flex-wrap: wrap; gap: .7rem 1.2rem; margin: 0 0 2.1rem; color: rgba(246,250,248,.68); font: .72rem/1.4 DM Mono, monospace; }
.hero__meta span + span { padding-left: 1.2rem; border-left: 1px solid rgba(255,255,255,.26); }
.actions { display: flex; flex-wrap: wrap; gap: .8rem; align-items: center; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 3.25rem; padding: .85rem 1.25rem; border: 1px solid transparent; border-radius: 999px; font: 700 .82rem/1 Manrope, sans-serif; text-decoration: none; transition: transform .2s ease, background .2s ease, border-color .2s ease; }
.button:hover, .button:focus-visible { transform: translateY(-2px); }
.button--primary { color: #14100b; background: var(--accent); box-shadow: 0 12px 32px rgba(0,0,0,.18); }
.button--primary:hover, .button--primary:focus-visible { background: #ffd19a; }
.button--ghost { color: #fff; border-color: rgba(255,255,255,.35); background: rgba(255,255,255,.05); }
.button--ghost:hover, .button--ghost:focus-visible { border-color: rgba(255,255,255,.7); background: rgba(255,255,255,.12); }
.hero__credit { position: absolute; right: 1.25rem; bottom: 1rem; color: rgba(255,255,255,.5); font-size: .65rem; }

.intro { padding: 6.5rem 0; background: var(--paper); }
.intro__grid { display: grid; grid-template-columns: minmax(240px, .75fr) minmax(0, 1.25fr); gap: clamp(2.5rem, 7vw, 8rem); align-items: start; }
.intro h2 { max-width: 430px; font-size: clamp(2rem, 4vw, 3.7rem); line-height: 1.02; }
.intro__copy { max-width: 650px; color: #35434a; font-size: 1.08rem; }
.intro__copy p { margin: 0 0 1rem; }
.intro__copy p:last-child { margin-bottom: 0; }

.book-section { padding: 5.5rem 0 6.5rem; color: #f6faf8; background: var(--ink); }
.book-grid { display: grid; grid-template-columns: minmax(200px, .48fr) minmax(0, 1.15fr); gap: clamp(2.5rem, 8vw, 8rem); align-items: center; }
.book-cover { max-width: 290px; margin-inline: auto; border-radius: 6px; box-shadow: 24px 28px 55px rgba(0,0,0,.34), 0 0 0 1px rgba(255,255,255,.14); transform: rotate(-2.5deg); }
.book-copy .eyebrow { color: var(--accent); }
.book-copy h2 { max-width: 680px; font-size: clamp(2.2rem, 4vw, 4rem); line-height: 1; }
.book-copy p { max-width: 680px; color: rgba(246,250,248,.74); }
.book-facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin: 2.3rem 0; border-block: 1px solid rgba(255,255,255,.16); }
.book-fact { padding: 1.05rem .9rem 1.1rem 0; }
.book-fact + .book-fact { padding-left: .9rem; border-left: 1px solid rgba(255,255,255,.16); }
.book-fact strong { display: block; color: var(--accent); font: 500 .68rem/1.3 DM Mono, monospace; letter-spacing: .1em; text-transform: uppercase; }
.book-fact span { display: block; margin-top: .4rem; font-size: .91rem; }
.book-copy .button--ghost { border-color: rgba(255,255,255,.25); }

.features { padding: 6.5rem 0; }
.section-heading { display: grid; grid-template-columns: minmax(220px, .65fr) minmax(0, 1.35fr); gap: 2rem; margin-bottom: 3rem; }
.section-heading h2 { font-size: clamp(2rem, 4vw, 3.75rem); line-height: 1; }
.section-heading p { max-width: 630px; margin: 0; color: var(--muted); font-size: 1.05rem; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.feature-card { min-height: 260px; padding: 1.5rem; border: 1px solid var(--line); border-radius: 16px; background: rgba(255,255,255,.42); }
.feature-card:nth-child(2) { background: var(--soft); }
.feature-card:nth-child(3) { color: #fff; background: var(--ink); }
.feature-card:nth-child(4) { background: #f7e6d7; }
.feature-card:nth-child(5) { background: #e7e1ef; }
.feature-card:nth-child(6) { background: #e3eee8; }
.feature-card__number { color: var(--accent-strong); font: .73rem/1 DM Mono, monospace; }
.feature-card h3 { margin: 3.2rem 0 .7rem; font-size: 1.45rem; line-height: 1.04; }
.feature-card p { margin: 0; color: inherit; opacity: .72; font-size: .92rem; }

.audience { padding: 6.5rem 0; color: #f6faf8; background: #223238; }
.audience__grid { display: grid; grid-template-columns: .75fr 1.25fr; gap: clamp(2rem, 8vw, 8rem); align-items: start; }
.audience h2 { font-size: clamp(2.2rem, 4vw, 4rem); line-height: 1; }
.audience__copy { color: rgba(246,250,248,.76); }
.audience__copy p { margin-top: 0; }
.audience ul { display: grid; grid-template-columns: repeat(2, 1fr); gap: .8rem 1.4rem; margin: 2rem 0 0; padding: 0; list-style: none; }
.audience li { padding: .85rem 0 .85rem 1.5rem; border-top: 1px solid rgba(255,255,255,.18); position: relative; font-size: .92rem; }
.audience li::before { content: "↗"; position: absolute; left: 0; color: var(--accent); }

.faq { padding: 6.5rem 0; }
.faq__grid { display: grid; grid-template-columns: .65fr 1.35fr; gap: clamp(2rem, 8vw, 8rem); }
.faq h2 { font-size: clamp(2rem, 4vw, 3.6rem); line-height: 1; }
.faq__intro { color: var(--muted); }
details { border-top: 1px solid var(--line); }
details:last-child { border-bottom: 1px solid var(--line); }
summary { display: flex; justify-content: space-between; gap: 1rem; padding: 1.25rem 0; cursor: pointer; list-style: none; font: 600 1.05rem/1.3 "Space Grotesk", sans-serif; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--accent-strong); font: 1.6rem/1 Manrope, sans-serif; }
details[open] summary::after { content: "−"; }
details p { max-width: 680px; margin: -.35rem 2rem 1.35rem 0; color: var(--muted); font-size: .94rem; }

.cta { padding: 5rem 0; color: #fff; background: var(--ink); }
.cta__inner { display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.cta h2 { max-width: 680px; font-size: clamp(2rem, 4vw, 4.2rem); line-height: 1; }
.site-footer { padding: 1.6rem 0; color: rgba(7,16,25,.62); background: #e8eeeb; font-size: .78rem; }
.site-footer__inner { display: flex; justify-content: space-between; gap: 1rem; }
.site-footer a { text-underline-offset: .18em; }

@media (max-width: 820px) {
  .hero { min-height: 760px; }
  .hero::before { background: linear-gradient(90deg, rgba(3, 10, 17, .93), rgba(3,10,17,.56)); }
  .intro__grid, .book-grid, .section-heading, .audience__grid, .faq__grid { grid-template-columns: 1fr; gap: 2rem; }
  .book-cover { margin: 0; max-width: 230px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .cta__inner { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 560px) {
  .shell { width: min(calc(100% - 1.5rem), var(--max)); }
  .topbar nav a:not(:last-child) { display: none; }
  .hero__content { padding-top: 8.5rem; }
  h1 { font-size: clamp(2.75rem, 15vw, 4.5rem); }
  .hero__meta { gap: .5rem .8rem; }
  .hero__meta span + span { padding-left: .8rem; }
  .intro, .features, .audience, .faq { padding: 4.5rem 0; }
  .book-section { padding: 4.5rem 0; }
  .book-facts { grid-template-columns: 1fr; }
  .book-fact, .book-fact + .book-fact { padding: .85rem 0; border-left: 0; }
  .book-fact + .book-fact { border-top: 1px solid rgba(255,255,255,.16); }
  .feature-grid, .audience ul { grid-template-columns: 1fr; }
  .feature-card { min-height: auto; }
  .feature-card h3 { margin-top: 2rem; }
  .site-footer__inner { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}