/* tkai.tech — Dark & Tech */

/* Space Grotesk — selbst gehostet (DSGVO-konform, kein Google-CDN) */
@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/space-grotesk-latin-400-normal.woff2") format("woff2");
}
@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("fonts/space-grotesk-latin-500-normal.woff2") format("woff2");
}
@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("fonts/space-grotesk-latin-700-normal.woff2") format("woff2");
}

:root {
  --bg: #0b0f14;
  --bg-card: #121821;
  --bg-card-hover: #182130;
  --text: #e6edf3;
  --text-muted: #93a1b0;
  --accent: #4fd1c5;
  --accent-2: #8b5cf6;
  --border: #1f2937;
  --radius: 14px;
  --maxw: 1080px;
  --font-display: "Space Grotesk", "Segoe UI", system-ui, sans-serif;
}

h1, h2, h3, .logo {
  font-family: var(--font-display);
  letter-spacing: -0.01em;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* Header */
header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 15, 20, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.logo {
  font-size: 1.4rem; font-weight: 700; letter-spacing: -0.02em;
  color: var(--text); text-decoration: none;
}
.logo span { color: var(--accent); }
.logo em { font-style: normal; color: var(--text-muted); font-size: 0.7em; font-weight: 600; margin-left: 2px; }
nav ul { display: flex; gap: 28px; list-style: none; }
nav a {
  color: var(--text-muted); text-decoration: none; font-size: 0.95rem;
  transition: color 0.2s;
}
nav a:hover, nav a.active { color: var(--text); }
.nav-cta {
  background: var(--accent); color: #06251f !important; font-weight: 600;
  padding: 8px 18px; border-radius: 8px;
}
.nav-cta:hover { filter: brightness(1.1); }

/* Hero */
.hero { padding: 110px 0 90px; text-align: center; position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(600px 300px at 30% 0%, rgba(79, 209, 197, 0.10), transparent),
    radial-gradient(600px 300px at 70% 10%, rgba(139, 92, 246, 0.10), transparent);
  pointer-events: none;
}
/* Feines Punktraster im Hero, nach unten auslaufend */
.hero::after {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(230, 237, 243, 0.08) 1px, transparent 1px);
  background-size: 26px 26px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,0.9), transparent 75%);
  mask-image: linear-gradient(to bottom, rgba(0,0,0,0.9), transparent 75%);
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; }
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem); font-weight: 800;
  letter-spacing: -0.03em; line-height: 1.15; margin-bottom: 20px;
}
.hero h1 .grad {
  background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent));
  background-size: 200% 100%;
  -webkit-background-clip: text; background-clip: text; color: transparent;
  animation: grad-shift 7s ease-in-out infinite;
}
.hero p {
  font-size: 1.15rem; color: var(--text-muted);
  max-width: 640px; margin: 0 auto 36px;
}
.btn {
  display: inline-block; text-decoration: none; font-weight: 600;
  padding: 13px 28px; border-radius: 10px; font-size: 1rem;
  transition: transform 0.15s, filter 0.15s;
}
.btn:hover { transform: translateY(-1px); filter: brightness(1.1); }
.btn-primary { background: var(--accent); color: #06251f; }
.btn-ghost { color: var(--text); border: 1px solid var(--border); margin-left: 12px; }

/* Sections */
section { padding: 70px 0; }
.section-title { font-size: 1.9rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 12px; }
.section-sub { color: var(--text-muted); max-width: 640px; margin-bottom: 42px; }

/* Cards */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; }
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  text-decoration: none; color: var(--text); display: block;
  transition: background 0.2s, border-color 0.2s, transform 0.15s;
}
.card:hover {
  background: var(--bg-card-hover); border-color: #2d3f55; transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(79, 209, 197, 0.12);
}
.card .icon { display: block; margin-bottom: 14px; color: var(--accent); line-height: 0; }
.card .icon svg { width: 28px; height: 28px; }
.card h3 { font-size: 1.15rem; margin-bottom: 8px; }
.card p { color: var(--text-muted); font-size: 0.95rem; }
.card .more { color: var(--accent); font-size: 0.9rem; font-weight: 600; margin-top: 14px; display: inline-block; }
.badge {
  display: inline-block; font-size: 0.75rem; font-weight: 600;
  color: var(--accent); border: 1px solid rgba(79, 209, 197, 0.35);
  background: rgba(79, 209, 197, 0.08);
  padding: 3px 10px; border-radius: 999px; margin-bottom: 14px;
}

/* Steps */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.step { border-left: 3px solid var(--accent); padding-left: 20px; }
.step .num { color: var(--accent); font-weight: 700; font-size: 0.9rem; }
.step h3 { margin: 6px 0 8px; font-size: 1.1rem; }
.step p { color: var(--text-muted); font-size: 0.95rem; }

/* Project pages */
.page-hero { padding: 90px 0 50px; position: relative; overflow: hidden; }
.page-hero::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(600px 300px at 30% 0%, rgba(79, 209, 197, 0.08), transparent);
  pointer-events: none;
}
.page-hero::after {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(230, 237, 243, 0.08) 1px, transparent 1px);
  background-size: 26px 26px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,0.9), transparent 75%);
  mask-image: linear-gradient(to bottom, rgba(0,0,0,0.9), transparent 75%);
  pointer-events: none;
}
.page-hero .container { position: relative; z-index: 1; }
.page-icon { display: block; color: var(--accent); margin-bottom: 18px; line-height: 0; }
.page-icon svg { width: 34px; height: 34px; }
.page-hero h1 { font-size: clamp(1.9rem, 4vw, 2.7rem); font-weight: 800; letter-spacing: -0.02em; margin-bottom: 16px; }
.page-hero p.lead { font-size: 1.1rem; color: var(--text-muted); max-width: 680px; }
.feature-list { list-style: none; margin-top: 10px; }
.feature-list li {
  padding: 14px 0 14px 34px; position: relative;
  border-bottom: 1px solid var(--border); color: var(--text-muted);
}
.feature-list li::before {
  content: ""; position: absolute; left: 0; top: 19px;
  width: 18px; height: 18px;
  background-color: var(--accent);
  -webkit-mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="black" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"><path d="M20 6 9 17l-5-5"/></svg>') center / contain no-repeat;
  mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="black" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"><path d="M20 6 9 17l-5-5"/></svg>') center / contain no-repeat;
}
.feature-list li strong { color: var(--text); }

/* Contact */
.contact-box {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 40px; text-align: center;
}
.contact-box h2 { font-size: 1.6rem; margin-bottom: 10px; }
.contact-box p { color: var(--text-muted); margin-bottom: 24px; }
.contact-box a.mail { color: var(--accent); font-size: 1.15rem; font-weight: 600; text-decoration: none; }

/* Footer */
footer { border-top: 1px solid var(--border); padding: 36px 0; margin-top: 40px; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: space-between; }
footer p { color: var(--text-muted); font-size: 0.9rem; }
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: var(--text-muted); font-size: 0.9rem; text-decoration: none; }
.footer-links a:hover { color: var(--text); }

/* Legal pages */
.legal { max-width: 760px; padding-top: 60px; }
.legal h1 { font-size: 2rem; margin-bottom: 24px; }
.legal h2 { font-size: 1.25rem; margin: 32px 0 10px; }
.legal p, .legal li { color: var(--text-muted); margin-bottom: 10px; }
.legal ul { margin: 0 0 14px 0; padding-left: 22px; }
.legal ul li { list-style: disc; }
.legal code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.92em; color: var(--text); }
.legal a { color: var(--accent); }
.legal strong { color: var(--text); }
.legal .note { color: #b39dfa; font-size: 0.9rem; }

/* Fokus-Zustände (Tastaturnavigation) */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}
.card:focus-visible, .btn:focus-visible, .nav-cta:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius);
}
.btn:focus-visible, .nav-cta:focus-visible { border-radius: 10px; }

@media (max-width: 700px) {
  nav ul { gap: 16px; }
  nav ul li.hide-mobile { display: none; }
  .hero { padding: 70px 0 60px; }
}

/* Animationen (script.js fügt .reveal/.visible hinzu; ohne JS bleibt alles sichtbar) */
@keyframes grad-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero h1 .grad { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
}