/* ── DESIGN TOKENS ─────────────────────────────────────────────────────────── */
:root {
  --white:      #ffffff;
  --off:        #f7f5f0;
  --off2:       #f0ece4;
  --surface:    #faf9f7;
  --border:     rgba(0,0,0,0.09);
  --border-med: rgba(0,0,0,0.15);
  --gold:       #C47F0A;
  --gold2:      #E8960A;
  --gold-light: #fdf3e0;
  --gold-text:  #7a5000;
  --black:      #0f0f0f;
  --ink:        #1a1814;
  --muted:      #6b6560;
  --dim:        #b0a89e;

  --font-display: 'Playfair Display', Georgia, serif;
  --font-body:    'DM Sans', system-ui, sans-serif;
  --font-mono:    'DM Mono', monospace;

  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;

  --shadow-sm: 0 1px 4px rgba(0,0,0,0.07);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.10);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.14);

  --max-width: 1200px;
  --nav-height: 64px;
}

/* ── RESET ──────────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--white);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; }

/* ── TYPOGRAPHY ─────────────────────────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--black);
}
h1 { font-size: clamp(2.4rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3vw, 2.8rem); }
h3 { font-size: 1.4rem; }
h4 { font-size: 1.1rem; }
p  { margin-bottom: 1rem; }

/* ── LAYOUT ─────────────────────────────────────────────────────────────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}
.section     { padding: 5rem 0; }
.section--alt { background: var(--off); }

.section-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}
.section-label::before {
  content: '';
  display: block;
  width: 24px;
  height: 1px;
  background: var(--gold);
}

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; }

/* ── BUTTONS ────────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.8rem 1.6rem;
  border: none;
  transition: all 0.2s;
  white-space: nowrap;
  cursor: pointer;
}
.btn-primary { background: var(--gold); color: var(--black); }
.btn-primary:hover { background: var(--gold2); transform: translateY(-1px); }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--border-med);
}
.btn-ghost:hover { border-color: var(--gold); color: var(--gold); }
.btn-dark { background: var(--black); color: var(--white); }
.btn-dark:hover { background: #2a2a2a; }

/* ── NAV ────────────────────────────────────────────────────────────────────── */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2.5rem;
  border-bottom: 1px solid transparent;
  transition: background 0.3s, border-color 0.3s, box-shadow 0.3s;
}
.site-nav.scrolled {
  background: rgba(255,254,252,0.97);
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(12px);
}
.nav-logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--black);
  letter-spacing: -0.02em;
}
.nav-logo span { color: var(--gold); font-style: italic; }
.nav-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.nav-link {
  font-family: var(--font-mono);
  font-size: 0.67rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.2s;
}
.nav-link:hover { color: var(--gold); }
.nav-lang {
  display: flex;
  gap: 0.35rem;
  padding-left: 1.25rem;
  border-left: 1px solid var(--border);
}
.lang-btn {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  background: none;
  border: 1px solid var(--border);
  color: var(--dim);
  padding: 0.2rem 0.45rem;
  transition: all 0.15s;
}
.lang-btn:hover, .lang-btn.active {
  border-color: var(--gold);
  color: var(--gold);
  background: var(--gold-light);
}

/* ── BOOK COVER CSS ─────────────────────────────────────────────────────────── */
.book-mockup {
  background: var(--black);
  padding: 3.5rem 3rem;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg), 8px 8px 0 var(--gold);
  max-width: 300px;
  width: 100%;
}
.book-mockup.large {
  padding: 4.5rem 3.5rem;
  max-width: 340px;
  box-shadow: var(--shadow-lg), 10px 10px 0 var(--gold);
}
.book-das  {
  font-family: var(--font-display);
  font-size: 1rem;
  color: rgba(196,127,10,0.55);
  letter-spacing: 0.12em;
  margin-bottom: 0.1rem;
}
.book-ki   {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 6.5rem;
  color: var(--gold2);
  line-height: 0.9;
  letter-spacing: -0.04em;
}
.book-unternehmen {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.7rem;
  color: var(--gold2);
  letter-spacing: -0.01em;
  margin-bottom: 2rem;
}
.book-sub  {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.35);
  border-top: 1px solid rgba(196,127,10,0.2);
  padding-top: 0.85rem;
  font-style: italic;
  line-height: 1.5;
}
.book-author {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.2);
  margin-top: 0.5rem;
  text-transform: uppercase;
}

/* ── PARTICLES ──────────────────────────────────────────────────────────────── */
.particle-field { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.particle {
  position: absolute;
  width: 2px;
  background: var(--gold2);
  animation: rise linear infinite;
  opacity: 0;
}
@keyframes rise {
  0%   { opacity: 0; transform: translateY(0); }
  10%  { opacity: 0.5; }
  90%  { opacity: 0.2; }
  100% { opacity: 0; transform: translateY(-400px); }
}

/* ── TAGS ───────────────────────────────────────────────────────────────────── */
.tag {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid var(--border-med);
  padding: 0.25rem 0.6rem;
  color: var(--muted);
}
.tag-list { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 1.5rem 0; }

/* ── FOOTER ─────────────────────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--black);
}
.footer-logo span { color: var(--gold); font-style: italic; }
.footer-meta {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.06em;
  color: var(--dim);
}

/* ── RESPONSIVE ─────────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .grid-2 { grid-template-columns: 1fr; gap: 2.5rem; }
  .site-nav { padding: 0 1.25rem; }
  .container { padding: 0 1.25rem; }
  .section { padding: 3rem 0; }
}
@media (max-width: 600px) {
  .nav-right .nav-link { display: none; }
}