/* heldmann-ki.de — landing page styles
   Self-contained: system fonts only (no Google Fonts CDN → avoids a GDPR problem). */

:root {
  --ink: #0f172a;
  --ink-soft: #475569;
  --muted: #64748b;
  --line: #e2e8f0;
  --line-soft: #eef2f7;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --accent-light: #60a5fa;
  --accent-tint: #eff6ff;
  --accent-glow: rgba(37, 99, 235, .18);
  --accent-glow-soft: rgba(37, 99, 235, .08);
  --grad-from: #2563eb;
  --grad-to: #7c3aed;
  --radius: 14px;
  --radius-sm: 10px;
  --maxw: 1080px;
  --shadow: 0 2px 4px rgba(15, 23, 42, .04), 0 16px 36px rgba(15, 23, 42, .06);
  --shadow-hover: 0 4px 8px rgba(15, 23, 42, .06), 0 24px 56px rgba(15, 23, 42, .10);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { line-height: 1.18; color: var(--ink); margin: 0 0 .5em; font-weight: 700; letter-spacing: -.015em; }
h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); letter-spacing: -.025em; }
h2 { font-size: clamp(1.7rem, 3.2vw, 2.3rem); }
h3 { font-size: 1.3rem; }
p { margin: 0 0 1em; color: var(--ink-soft); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 88px 0; }
.section--alt { background: var(--bg-alt); border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); }
.section__lead { max-width: 720px; }

.eyebrow {
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1em;
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 28px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

/* Gradient text accent (H1 "KI" + brand mark) */
.grad {
  background: linear-gradient(135deg, var(--grad-from) 0%, var(--grad-to) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* Buttons */
.btn {
  display: inline-block; padding: 14px 26px; border-radius: var(--radius-sm);
  font-weight: 700; font-size: 1rem; cursor: pointer; border: 1.5px solid transparent;
  transition: transform .15s ease, background .15s ease, box-shadow .2s ease, color .15s ease;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: var(--accent); color: #fff;
  box-shadow: 0 2px 6px var(--accent-glow), 0 10px 28px var(--accent-glow-soft);
}
.btn--primary:hover {
  background: var(--accent-dark); color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px var(--accent-glow), 0 14px 36px var(--accent-glow);
}
.btn--ghost { background: #fff; color: var(--accent); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent-dark); transform: translateY(-1px); }
.btn--lg { padding: 16px 32px; font-size: 1.05rem; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.88);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line-soft);
}
.site-header__inner { display: flex; align-items: center; justify-content: space-between; min-height: 66px; gap: 24px; }
.brand { font-weight: 800; font-size: 1.08rem; letter-spacing: -.02em; color: var(--ink); white-space: nowrap; }
.brand strong {
  font-weight: 800;
  background: linear-gradient(135deg, var(--grad-from) 0%, var(--grad-to) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.brand span { color: var(--muted); font-weight: 600; }
.nav { display: flex; align-items: center; gap: 28px; }
.nav__links { display: inline-flex; align-items: center; gap: 28px; }
.nav__links a {
  position: relative;
  display: inline-block;
  padding: 8px 0;
  color: var(--ink-soft);
  font-size: .96rem;
  font-weight: 600;
  transition: color .15s ease;
}
.nav__links a:hover { color: var(--accent); text-decoration: none; }
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 2px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .2s ease;
}
.nav__links a:hover::after { transform: scaleX(1); }
.nav .btn { padding: 10px 20px; font-size: .92rem; }
.nav .btn--primary, .nav .btn--primary:hover, .nav .btn--primary:focus { color: #fff; }
@media (max-width: 820px) { .nav__links { display: none; } }

/* Hero — soft gradients + subtle dot pattern */
.hero {
  position: relative;
  padding: 116px 0 100px;
  overflow: hidden;
  background:
    radial-gradient(900px 420px at 88% -10%, rgba(37, 99, 235, .14), transparent 60%),
    radial-gradient(700px 360px at -10% 95%, rgba(124, 58, 237, .08), transparent 60%),
    linear-gradient(180deg, #eff6ff 0%, #ffffff 70%);
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(15, 23, 42, .08) 1px, transparent 0);
  background-size: 26px 26px;
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 35%, transparent 75%);
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 35%, transparent 75%);
  pointer-events: none;
  opacity: .6;
}
.hero > .wrap { position: relative; z-index: 1; }
.hero h1 { max-width: 17ch; }
.hero__sub { font-size: 1.22rem; max-width: 660px; color: var(--ink-soft); margin-bottom: 2em; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.hero__note { font-size: .92rem; color: var(--muted); margin: 1.6em 0 0; display: flex; flex-wrap: wrap; gap: 6px 18px; }
.hero__note span { display: inline-flex; align-items: center; gap: 8px; }
.hero__note span::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); display: inline-block; }

/* Generic two-col */
.cols { display: grid; gap: 40px; }
@media (min-width: 880px) { .cols--2 { grid-template-columns: 1.05fr .95fr; align-items: start; } }

/* "Statt X / Hier Y" comparison rows */
.compare { margin-top: 48px; display: grid; gap: 16px; }
.compare__row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 22px;
  box-shadow: 0 2px 6px rgba(15, 23, 42, .04);
  transition: transform .2s ease, box-shadow .2s ease;
}
.compare__row:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.compare__bad, .compare__good { display: flex; flex-direction: column; gap: 6px; }
.compare__label {
  font-size: .68rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase;
}
.compare__bad .compare__label { color: #b91c1c; }
.compare__good .compare__label { color: var(--accent); }
.compare__bad p {
  margin: 0; color: var(--muted);
  text-decoration: line-through; text-decoration-thickness: 1px;
  text-decoration-color: rgba(185, 28, 28, .35);
}
.compare__good p { margin: 0; color: var(--ink); font-weight: 600; }
.compare__arrow {
  color: var(--accent); font-weight: 700; font-size: 1.4rem; line-height: 1;
  display: flex; align-items: center; justify-content: center;
}
@media (max-width: 720px) {
  .compare__row { grid-template-columns: 1fr; gap: 12px; }
  .compare__arrow { transform: rotate(90deg); padding: 4px 0; }
}

/* Package cards */
.packages { display: grid; gap: 24px; margin-top: 44px; }
@media (min-width: 880px) {
  .packages {
    grid-template-columns: repeat(2, 1fr);
    max-width: 880px;
    margin-left: auto;
    margin-right: auto;
  }
}
.pkg {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 28px;
  display: flex; flex-direction: column;
  box-shadow: var(--shadow);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
  position: relative;
}
.pkg:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.pkg--feature {
  border-color: var(--accent);
  background: linear-gradient(180deg, #ffffff 0%, var(--accent-tint) 130%);
  box-shadow: 0 0 0 1px var(--accent), 0 6px 14px var(--accent-glow-soft), 0 20px 48px var(--accent-glow);
}
.pkg--feature:hover { transform: translateY(-6px); }
.pkg__tag {
  font-size: .72rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 12px;
}
.pkg--feature .pkg__tag {
  display: inline-block; background: var(--accent); color: #fff;
  padding: 4px 12px; border-radius: 999px; margin-bottom: 14px;
  box-shadow: 0 4px 12px var(--accent-glow);
}
.pkg h3 { margin-bottom: .4em; }
.pkg p { font-size: .98rem; }
.pkg__price {
  margin-top: auto; padding-top: 18px; border-top: 1px solid var(--line);
  font-weight: 800; color: var(--ink); font-size: 1.08rem;
}
.pkg__price small { display: block; font-weight: 500; color: var(--muted); font-size: .82rem; margin-top: 6px; }

/* Case study */
.case {
  background: linear-gradient(135deg, var(--accent-tint) 0%, #ffffff 100%);
  border: 1px solid #dbeafe;
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 40px;
  box-shadow: 0 4px 18px var(--accent-glow-soft);
}
.case h3 { color: var(--accent-dark); }
.case p:last-child { margin-bottom: 0; }

/* Dark stats band — big visual moment */
.stats {
  padding: 72px 0;
  background:
    radial-gradient(800px 320px at 0% 0%, rgba(96, 165, 250, .18), transparent 60%),
    radial-gradient(700px 320px at 100% 100%, rgba(124, 58, 237, .22), transparent 60%),
    linear-gradient(135deg, #0b1730 0%, #102348 50%, #0b1730 100%);
  color: #e2e8f0;
  position: relative;
  overflow: hidden;
}
.stats::before {
  content: "";
  position: absolute; inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(255,255,255,.06) 1px, transparent 0);
  background-size: 28px 28px;
  pointer-events: none;
}
.stats__grid {
  position: relative; z-index: 1;
  display: grid; gap: 32px;
}
@media (min-width: 760px) { .stats__grid { grid-template-columns: repeat(3, 1fr); gap: 40px; } }
.stat { text-align: left; }
.stat__num {
  font-size: clamp(2.6rem, 5vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1;
  background: linear-gradient(135deg, #ffffff 0%, #a5b4fc 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  margin-bottom: 12px;
}
.stat__label { font-size: .96rem; color: #cbd5e1; max-width: 28ch; }

/* About */
.about__creds { list-style: none; padding: 0; margin: 1.4em 0 0; display: grid; gap: 12px; }
.about__creds li {
  padding-left: 32px; position: relative; color: var(--ink-soft); font-size: .98rem;
}
.about__creds li::before {
  content: ""; position: absolute; left: 0; top: .42em;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent-tint); border: 1.5px solid var(--accent);
}
.about__creds li::after {
  content: ""; position: absolute; left: 5px; top: .68em;
  width: 8px; height: 4px; border-left: 2px solid var(--accent); border-bottom: 2px solid var(--accent);
  transform: rotate(-45deg);
}

/* Tech stack chips */
.stack { margin-top: 32px; padding-top: 28px; border-top: 1px solid var(--line); }
.stack__label {
  font-size: .76rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase;
  color: var(--muted); margin: 0 0 14px;
}
.stack__chips { display: flex; flex-wrap: wrap; gap: 8px; }
.stack__chips span {
  display: inline-flex; align-items: center;
  padding: 6px 14px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 600;
  color: var(--ink-soft);
  transition: border-color .15s ease, color .15s ease, transform .15s ease;
}
.stack__chips span:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }

/* FAQ */
.faq { display: grid; gap: 14px; margin-top: 32px; max-width: 820px; }
.faq details {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 4px 24px;
  transition: border-color .2s ease, box-shadow .2s ease, background .2s ease;
}
.faq details:hover { border-color: var(--accent-light); box-shadow: 0 4px 14px var(--accent-glow-soft); }
.faq details[open] {
  border-color: var(--accent);
  background: linear-gradient(180deg, #ffffff 0%, var(--accent-tint) 120%);
}
.faq summary { cursor: pointer; font-weight: 700; padding: 18px 0; list-style: none; color: var(--ink); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--accent); font-weight: 700; font-size: 1.4rem; line-height: 1; transition: transform .2s ease; }
.faq details[open] summary::after { content: "–"; }
.faq details p { padding-bottom: 18px; margin: 0; font-size: .98rem; }

/* CTA band */
.cta-band {
  text-align: center;
  background:
    radial-gradient(720px 320px at 50% 100%, rgba(37, 99, 235, .14), transparent 60%),
    radial-gradient(520px 220px at 50% 0%, rgba(124, 58, 237, .06), transparent 60%);
}
.cta-band h2 { margin-bottom: .3em; }
.cta-band p { max-width: 580px; margin: 0 auto 1.8em; }
.cta-band .embed-slot {
  margin: 28px auto 0; max-width: 720px; min-height: 80px;
  border: 1px dashed var(--line); border-radius: var(--radius);
  padding: 18px; color: var(--muted); font-size: .9rem; background: #fff;
}
.cta-links { margin-top: 24px; font-size: .98rem; color: var(--muted); }
.cta-links a { font-weight: 600; }

/* Footer */
.site-footer { background: var(--ink); color: #cbd5e1; padding: 44px 0; font-size: .9rem; }
.site-footer a { color: #e2e8f0; }
.site-footer__inner { display: flex; flex-wrap: wrap; gap: 12px 28px; align-items: center; justify-content: space-between; }
.site-footer__links { display: flex; gap: 22px; }

/* Legal pages */
.legal { padding: 64px 0; }
.legal h1 { margin-bottom: .6em; }
.legal h2 { font-size: 1.3rem; margin-top: 1.6em; }
.legal p, .legal li { color: var(--ink-soft); font-size: .98rem; }
.legal .back { display: inline-block; margin-bottom: 24px; font-weight: 600; }
.note {
  background: #fffbeb; border: 1px solid #fde68a; border-radius: 10px;
  padding: 14px 18px; font-size: .92rem; color: #78350f; margin: 16px 0;
}