:root{
  --ease-quint:cubic-bezier(0.22,1,0.36,1);--ease-expo:cubic-bezier(0.16,1,0.3,1);
  /* Marken-Tokens — Werte 1:1 aus dem Design-System (index.html) */
  --c-offwhite:#FAFAF9;--c-anthrazit:#1C1C1E;--c-petrol:#0D5C63;--c-salbei:#7C9A8E;--c-rot:#B3402A;
  --font-serif:'Instrument Serif',Georgia,serif;--font-sans:'Geist',-apple-system,BlinkMacSystemFont,sans-serif;
}
/* OTC-AI — geteiltes Design-System für Unterseiten.
   Marke aus index.html: Off-White #FAFAF9, Anthrazit #1C1C1E, Petrol #0D5C63,
   Instrument Serif (Headlines) + Geist (Body). */

* { margin: 0; padding: 0; outline: none !important; box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { width: 100%; background: #FAFAF9; font-family: 'Geist', -apple-system, BlinkMacSystemFont, sans-serif; color: #1C1C1E; overflow-x: hidden; -webkit-font-smoothing: antialiased; }

/* ── Nav (Unterseiten: immer solide) ── */
.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; display: flex; align-items: center; justify-content: space-between; padding: 18px 48px; background: rgba(250,250,249,0.9); -webkit-backdrop-filter: blur(20px); backdrop-filter: blur(20px); border-bottom: 1px solid rgba(0,0,0,0.08); }
.nav-brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.nav-brand-dot { width: 8px; height: 8px; background: #0D5C63; box-shadow: 0 0 12px rgba(13,92,99,0.6); animation: pulse 1s steps(2) infinite; }
@keyframes pulse { 0%,100% { opacity:1; } 50% { opacity:0.2; } }
.nav-brand-text { font-size: 14px; font-weight: 600; color: #1C1C1E; letter-spacing: 2px; text-transform: uppercase; }
.nav-links { display: flex; align-items: center; gap: 36px; }
.nav-links a { font-size: 13px; font-weight: 400; color: rgba(28,28,30,0.7); text-decoration: none; letter-spacing: 0.5px; transition: color 0.2s ease; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: rgba(28,28,30,1); }
.nav-cta { font-size: 13px; font-weight: 500; color: #fff !important; background: #0D5C63; padding: 10px 24px; border-radius: 100px; text-decoration: none; letter-spacing: 0.3px; transition: opacity 0.25s ease; border: 1px solid #0D5C63; }
.nav-cta:hover { opacity: 0.85; }
.nav-hamburger { display: none; flex-direction: column; justify-content: center; gap: 5px; width: 32px; height: 32px; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-hamburger span { display: block; width: 100%; height: 1.5px; background: rgba(28,28,30,0.7); transition: transform 0.3s ease, opacity 0.3s ease; }
.nav-hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }
.mobile-menu { display: none; position: fixed; inset: 0; background: rgba(250,250,249,0.97); z-index: 50; flex-direction: column; align-items: center; justify-content: center; opacity: 0; pointer-events: none; transition: opacity 0.3s ease; -webkit-backdrop-filter: blur(20px); backdrop-filter: blur(20px); }
.mobile-menu.open { opacity: 1; pointer-events: auto; }
.mobile-menu a { font-size: 26px; font-weight: 300; color: rgba(28,28,30,0.5); text-decoration: none; padding: 14px 0; }
.mobile-menu a:hover { color: rgba(28,28,30,0.95); }
.mobile-menu .mobile-cta { margin-top: 24px; font-size: 14px; font-weight: 500; color: #fff; background: #0D5C63; padding: 14px 36px; border-radius: 100px; }

/* ── Buttons ── */
.btn-primary { position: relative; display: inline-flex; align-items: center; gap: 10px; padding: 13px 28px; background: transparent; color: #fff; font-family: 'Geist', sans-serif; font-size: 13px; font-weight: 500; border: 1px solid #0D5C63; border-radius: 100px; cursor: pointer; letter-spacing: 0.2px; white-space: nowrap; overflow: hidden; isolation: isolate; text-decoration: none; }
.btn-primary::before { content: ''; position: absolute; inset: 0; background: #0D5C63; border-radius: inherit; transform: scaleX(1); transform-origin: left center; transition: transform 0.25s cubic-bezier(0.4,0,0.2,1); z-index: -1; }
.btn-primary:hover::before { transform: scaleX(0); transform-origin: right center; }
.btn-primary:hover { color: #1C1C1E; }
.btn-primary svg { width: 13px; height: 13px; }
.btn-secondary { display: inline-flex; align-items: center; gap: 10px; padding: 13px 28px; background: transparent; color: rgba(28,28,30,0.8); font-family: 'Geist', sans-serif; font-size: 13px; font-weight: 400; border: 1px solid rgba(0,0,0,0.12); border-radius: 100px; cursor: pointer; letter-spacing: 0.2px; transition: border-color 0.25s ease, color 0.25s ease; white-space: nowrap; text-decoration: none; }
.btn-secondary:hover { border-color: rgba(28,28,30,0.4); color: rgba(28,28,30,0.9); }

/* ── Section-Grundlagen ── */
.section { position: relative; z-index: 10; background: #FAFAF9; }
.section-inner { max-width: 1280px; margin: 0 auto; width: 100%; }
.section-label { font-size: 11px; font-weight: 500; color: rgba(13,92,99,0.7); letter-spacing: 3px; text-transform: uppercase; margin-bottom: 24px; }
.section-heading { font-family: 'Instrument Serif', Georgia, serif; font-size: clamp(36px, 5.5vw, 72px); font-weight: 400; color: #1C1C1E; line-height: 1.05; letter-spacing: -1.5px; max-width: 760px; margin-bottom: 64px; }
.section-heading .thin { color: rgba(28,28,30,0.35); }

/* ── Subhero (statischer Seitenkopf) ── */
.subhero { padding: 168px 48px 72px; border-bottom: 1px solid rgba(0,0,0,0.06); position: relative; overflow: hidden; }
.subhero::after { content: ''; position: absolute; top: -40%; right: -10%; width: 540px; height: 540px; background: radial-gradient(circle, rgba(13,92,99,0.07), transparent 70%); pointer-events: none; }
.subhero-inner { max-width: 1280px; margin: 0 auto; position: relative; z-index: 2; }
.subhero-h1 { font-family: 'Instrument Serif', Georgia, serif; font-size: clamp(44px, 8vw, 100px); font-weight: 400; color: #1C1C1E; line-height: 0.98; letter-spacing: -2.5px; margin-bottom: 28px; max-width: 14em; }
.subhero-h1 .thin { color: rgba(28,28,30,0.4); }
.subhero-sub { font-size: 16px; font-weight: 400; color: rgba(28,28,30,0.6); line-height: 1.75; max-width: 620px; margin-bottom: 36px; }
.subhero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.breadcrumb { display: flex; gap: 8px; align-items: center; font-size: 12px; color: rgba(28,28,30,0.35); margin-bottom: 28px; letter-spacing: 0.3px; }
.breadcrumb a { color: rgba(28,28,30,0.45); text-decoration: none; } .breadcrumb a:hover { color: rgba(13,92,99,0.9); }

/* ── Prose ── */
.prose-section { padding: 96px 48px; }
.prose { max-width: 720px; }
.prose p { font-size: 16px; line-height: 1.8; color: rgba(28,28,30,0.65); margin-bottom: 20px; }
.prose h3 { font-size: 22px; font-weight: 500; color: #1C1C1E; letter-spacing: -0.4px; margin: 40px 0 14px; }
.lead { font-size: 19px; line-height: 1.7; color: rgba(28,28,30,0.78); margin-bottom: 28px; }

/* ── Outcome-/Feature-Grid (wiederverwendet) ── */
.grid-1px { display: grid; gap: 1px; background: rgba(0,0,0,0.04); border: 1px solid rgba(0,0,0,0.06); }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cell { background: #FAFAF9; padding: 40px 36px; transition: background 0.3s ease; }
.cell:hover { background: rgba(0,0,0,0.018); }
.cell-num { font-family: 'Instrument Serif', Georgia, serif; font-size: 26px; color: rgba(13,92,99,0.35); line-height: 1; margin-bottom: 18px; }
.cell-icon { width: 42px; height: 42px; border: 1px solid rgba(13,92,99,0.25); border-radius: 11px; display: flex; align-items: center; justify-content: center; background: rgba(13,92,99,0.08); margin-bottom: 18px; }
.cell-icon svg { width: 19px; height: 19px; stroke: #0D5C63; fill: none; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.cell-title { font-size: 18px; font-weight: 500; color: rgba(28,28,30,0.92); letter-spacing: -0.3px; margin-bottom: 10px; }
.cell-desc { font-size: 14px; color: rgba(28,28,30,0.5); line-height: 1.7; }
.pillrow { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.cell-link { display: inline-flex; align-items: center; gap: 5px; margin-top: 18px; font-size: 13px; font-weight: 500; color: #0D5C63; text-decoration: none; letter-spacing: 0.2px; transition: gap 0.2s ease; }
.cell-link:hover { gap: 9px; }
.pill { font-size: 12px; color: rgba(13,92,99,0.85); background: rgba(13,92,99,0.08); border: 1px solid rgba(13,92,99,0.15); padding: 5px 14px; border-radius: 100px; }

/* ── Stat-Reihe ── */
.statrow { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.stat-val { font-family: 'Instrument Serif', Georgia, serif; font-size: clamp(40px, 5vw, 68px); color: #1C1C1E; letter-spacing: -2px; line-height: 1; }
.stat-label { font-size: 13px; font-weight: 300; color: rgba(28,28,30,0.4); line-height: 1.5; margin-top: 8px; }

/* ── FAQ ── */
.faq { max-width: 800px; }
.faq-item { border-bottom: 1px solid rgba(0,0,0,0.08); }
.faq-q { width: 100%; text-align: left; background: none; border: none; cursor: pointer; padding: 24px 0; display: flex; justify-content: space-between; align-items: center; gap: 24px; font-family: 'Geist', sans-serif; font-size: 17px; font-weight: 500; color: #1C1C1E; }
.faq-q svg { width: 16px; height: 16px; flex-shrink: 0; stroke: rgba(13,92,99,0.7); stroke-width: 2; fill: none; transition: transform 0.3s ease; }
.faq-q[aria-expanded="true"] svg { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.4s var(--ease-quint); }
.faq-a.open { max-height: 320px; }
.faq-a p { font-size: 15px; line-height: 1.75; color: rgba(28,28,30,0.6); padding: 0 0 24px; max-width: 680px; }

/* ── Briefing-Flow ── */
.briefing { max-width: 640px; background: #fff; border: 1px solid rgba(0,0,0,0.07); border-radius: 18px; padding: 40px; }
.briefing-step { display: none; } .briefing-step.active { display: block; animation: fade .35s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.briefing-progress { display: flex; gap: 6px; margin-bottom: 28px; }
.briefing-progress span { flex: 1; height: 3px; background: rgba(0,0,0,0.08); border-radius: 2px; transition: background 0.3s ease; }
.briefing-progress span.done { background: #0D5C63; }
.briefing label { display: block; font-size: 13px; font-weight: 500; color: rgba(28,28,30,0.7); margin-bottom: 10px; letter-spacing: 0.2px; }
.briefing input, .briefing textarea, .briefing select { width: 100%; font-family: 'Geist', sans-serif; font-size: 15px; color: #1C1C1E; background: #FAFAF9; border: 1px solid rgba(0,0,0,0.12); border-radius: 10px; padding: 13px 16px; transition: border-color 0.2s ease; }
.briefing input:focus, .briefing textarea:focus, .briefing select:focus { border-color: rgba(13,92,99,0.6); }
.briefing textarea { min-height: 96px; resize: vertical; }
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { font-size: 13px; padding: 9px 16px; border-radius: 100px; border: 1px solid rgba(0,0,0,0.14); background: #FAFAF9; color: rgba(28,28,30,0.7); cursor: pointer; transition: all 0.2s ease; }
.chip.sel { background: rgba(13,92,99,0.1); border-color: #0D5C63; color: #0D5C63; }
.briefing-nav { display: flex; justify-content: space-between; margin-top: 28px; gap: 12px; }
.briefing-hint { font-size: 12px; color: rgba(28,28,30,0.35); margin-top: 16px; line-height: 1.5; }

/* ── Callout / Hinweis ── */
.callout { background: rgba(13,92,99,0.05); border: 1px solid rgba(13,92,99,0.12); border-radius: 14px; padding: 28px 32px; max-width: 760px; }
.callout-label { font-size: 11px; font-weight: 600; color: #0D5C63; letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 10px; }
.callout p { font-size: 15px; line-height: 1.7; color: rgba(28,28,30,0.65); }

/* ── Footer ── */
.footer { position: relative; z-index: 10; background: #FAFAF9; border-top: 1px solid rgba(0,0,0,0.06); padding: 48px; }
.footer-inner { max-width: 1280px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer-left { display: flex; align-items: center; gap: 10px; }
.footer-dot { width: 6px; height: 6px; background: rgba(13,92,99,0.6); }
.footer-brand { font-size: 12px; font-weight: 500; color: rgba(28,28,30,0.35); letter-spacing: 2px; text-transform: uppercase; }
.footer-links { display: flex; gap: 24px; flex-wrap: wrap; }
.footer-links a { font-size: 12px; color: rgba(28,28,30,0.3); text-decoration: none; transition: color 0.2s ease; }
.footer-links a:hover { color: rgba(28,28,30,0.5); }
.footer-right { font-size: 11px; color: rgba(28,28,30,0.2); }

/* ── Reveal ── */
.reveal { opacity: 0; transform: translateY(34px); transition: opacity 0.8s var(--ease-quint), transform 0.8s var(--ease-quint); }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.08s; } .reveal-delay-2 { transition-delay: 0.16s; } .reveal-delay-3 { transition-delay: 0.24s; } .reveal-delay-4 { transition-delay: 0.32s; }

/* ── Focus ── */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible { outline: 2px solid rgba(13,92,99,0.8); outline-offset: 3px; border-radius: 8px; }

/* ── Effekt-Politur (hover-getriggert, GPU) ── */
.cell { transition: background 0.35s var(--ease-quint); }
.cell:hover { background: #fff; }
.cell-num { transition: color 0.35s var(--ease-quint); }
.cell:hover .cell-num { color: rgba(13,92,99,0.7); }
.cell-link { position: relative; }
.cell-link::after { content: ''; position: absolute; left: 0; bottom: -2px; width: 100%; height: 1px; background: currentColor; transform: scaleX(0); transform-origin: left center; transition: transform 0.4s var(--ease-quint); }
.cell-link:hover::after { transform: scaleX(1); }
.nav-links a:not(.nav-cta) { position: relative; }
.nav-links a:not(.nav-cta)::after { content: ''; position: absolute; left: 0; bottom: -5px; width: 100%; height: 1px; background: rgba(13,92,99,0.85); transform: scaleX(0); transform-origin: left center; transition: transform 0.3s var(--ease-quint); }
.nav-links a:not(.nav-cta):hover::after, .nav-links a[aria-current="page"]::after { transform: scaleX(1); }
.btn-primary svg, .btn-secondary svg { transition: transform 0.3s var(--ease-quint); }
.btn-primary:hover svg, .btn-secondary:hover svg { transform: translateX(3px); }
.tm-card { transition: transform 0.4s var(--ease-quint), box-shadow 0.4s var(--ease-quint); }
.tm-card:hover { transform: translateY(-4px); box-shadow: 0 16px 48px rgba(13,92,99,0.10); }

@media (prefers-reduced-motion: reduce) { .reveal { transition: none !important; opacity: 1 !important; transform: none !important; } .briefing-step.active { animation: none; } }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .nav { padding: 16px 36px; } .subhero { padding: 140px 36px 60px; } .prose-section { padding: 80px 36px; } .footer { padding: 40px 36px; }
  .cols-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav { padding: 14px 20px; } .nav-links { display: none; } .nav-hamburger { display: flex; } .mobile-menu { display: flex; }
  .subhero { padding: 120px 20px 52px; } .subhero-h1 { letter-spacing: -1.5px; } .subhero-sub { font-size: 15px; }
  .subhero-actions { flex-direction: column; } .subhero-actions .btn-primary, .subhero-actions .btn-secondary { width: 100%; justify-content: center; min-height: 48px; }
  .prose-section { padding: 64px 20px; } .section-heading { margin-bottom: 40px; }
  .cols-3, .cols-2, .statrow { grid-template-columns: 1fr; } .statrow { gap: 28px; }
  .cell { padding: 30px 24px; } .briefing { padding: 28px 22px; }
  .footer { padding: 32px 20px; } .footer-inner { flex-direction: column; align-items: flex-start; gap: 16px; }
}

/* Briefing-Validierung */
.briefing-error { color: var(--c-rot); font-size: 14px; margin: 4px 0 12px; }
.briefing input.invalid { border-color: var(--c-rot); }