/* ============================================================
   six-ai — Landing Page Styles
   Mobile-First, Dark Mode, CSS Custom Properties
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  /* Farben */
  --bg:            #0b1120;
  --bg-elev:       #111a2e;
  --bg-card:       #131c33;
  --bg-card-hover: #18223d;
  --border:        #1f2a44;
  --border-strong: #2c3a5a;

  --text:          #e2e8f0;
  --text-muted:    #94a3b8;
  --text-dim:      #64748b;

  --accent:        #06b6d4;   /* Cyan */
  --accent-strong: #0891b2;
  --accent-2:      #a855f7;   /* Purple */
  --accent-3:      #22c55e;   /* Green */
  --danger:        #ef4444;

  /* Typografie */
  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, 'Liberation Mono', 'Courier New', monospace;

  /* Layout */
  --container:     1180px;
  --radius:        14px;
  --radius-sm:     8px;
  --shadow-card:   0 1px 0 rgba(255,255,255,0.04) inset, 0 10px 30px rgba(0,0,0,0.35);
  --shadow-hover:  0 1px 0 rgba(255,255,255,0.06) inset, 0 20px 50px rgba(0,0,0,0.5);

  /* Motion */
  --ease:          cubic-bezier(0.22, 1, 0.36, 1);
  --dur-fast:      180ms;
  --dur:           320ms;
  --dur-slow:      560ms;
}

/* ---------- Reset (minimal, modern) ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Dekoratives Aurora-Hintergrundlicht ---------- */
.aurora {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}
.aurora__blob {
  position: absolute;
  width: 50vmax;
  height: 50vmax;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.35;
  will-change: transform;
  animation: drift 22s ease-in-out infinite alternate;
}
.aurora__blob--a { background: var(--accent);   top: -15vmax; left: -10vmax; }
.aurora__blob--b { background: var(--accent-2); top: 30vmax;  right: -15vmax; animation-delay: -7s; }
.aurora__blob--c { background: var(--accent-3); bottom: -20vmax; left: 20vmax; animation-delay: -14s; opacity: 0.22; }

@keyframes drift {
  0%   { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(6vmax, -4vmax, 0) scale(1.1); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .aurora__blob { animation: none; }
}

/* ---------- Topbar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.875rem 1.25rem;
  max-width: var(--container);
  margin: 0 auto;
  /* Glassmorphism @ 25% Opacity */
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  background: color-mix(in oklab, var(--bg) 25%, transparent);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.04),
    0 4px 24px rgba(0,0,0,0.18);
  /* Isoliert die Topbar im Compositing-Layer -> backdrop-filter und
     glass-bg wirken gleichmaessig ueber die GANZE Breite, statt von
     children-stacking-contexts (canvas, WebGL) gestoert zu werden. */
  isolation: isolate;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.topbar.is-scrolled {
  /* Kein Background-Wechsel mehr -> bleibt bei 15% Opacity.
     Nur Shadow + Border subtle staerker als Scroll-Indikator. */
  border-bottom-color: rgba(255,255,255,0.10);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.06),
    0 8px 28px rgba(0,0,0,0.22);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.brand__mark {
  /* 3D-Wuerfel-Logo inline. Transparenter Canvas -> Topbar
     scheint nahtlos durch, kein Card-Look. */
  display: block;
  width: 96px;
  height: 96px;
  border: 0;
  background: transparent;
  cursor: grab;
  touch-action: none;
}
.brand__text {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: baseline;
  gap: 0.05em;
}
/* Animierter Gradient auf "six" wie unten in dice-3d.html */
.brand__six {
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 50%, var(--accent-3) 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
  animation: brand-gradient-shift 10s linear infinite;
}
.brand__dot { color: var(--text-dim); margin: 0 0.12em; font-weight: 700; }
.brand__ai  { color: var(--text); font-weight: 600; }

@keyframes brand-gradient-shift {
     0% { background-position:   0% 0%; }
   100% { background-position: 200% 0%; }
}
@media (prefers-reduced-motion: reduce) {
  .brand__six { animation: none; }
}
.nav {
  display: none;
  gap: 1.25rem;
}
.nav a {
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: color var(--dur-fast) var(--ease);
}
.nav a:hover { color: var(--text); }
@media (min-width: 720px) {
  .nav { display: inline-flex; }
}

/* ---------- Hero ---------- */
.hero {
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(3rem, 9vw, 6rem) 1.25rem clamp(3rem, 6vw, 5rem);
}
.hero__inner { max-width: 760px; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.75rem;
  border-radius: 999px;
  background: color-mix(in oklab, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in oklab, var(--accent) 35%, transparent);
  color: var(--text);
  font-size: 0.78rem;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}
.chip__dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--accent) 25%, transparent);
  animation: pulse 2.2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.55; transform: scale(0.85); }
}

.hero h1 {
  margin: 1.25rem 0 0.75rem;
  font-size: clamp(2.4rem, 6.5vw, 4.25rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  font-weight: 700;
}
.hero__sub {
  display: block;
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  color: var(--text-muted);
  font-weight: 500;
  margin-top: 0.5rem;
}
.grad {
  background: linear-gradient(135deg, #fff 0%, var(--accent) 55%, var(--accent-2) 100%);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
}
.hero__lead {
  max-width: 56ch;
  color: var(--text-muted);
  font-size: 1.05rem;
  margin: 0.75rem 0 2rem;
}
.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}
.hero__meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition:
    transform var(--dur-fast) var(--ease),
    background var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease),
    box-shadow var(--dur-fast) var(--ease);
  will-change: transform;
}
.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--accent);
  color: #0b1120;
  box-shadow: 0 8px 24px color-mix(in oklab, var(--accent) 35%, transparent);
}
.btn--primary:hover {
  background: var(--accent-strong);
  box-shadow: 0 12px 32px color-mix(in oklab, var(--accent) 45%, transparent);
}

.btn--ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}
.btn--ghost:hover {
  background: var(--bg-elev);
  border-color: var(--accent);
}

/* ---------- Sections ---------- */
.section {
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(3rem, 6vw, 5rem) 1.25rem;
}
.section--narrow { max-width: 760px; }
.section__head { margin-bottom: clamp(1.5rem, 3vw, 2.5rem); }
.section h2 {
  font-size: clamp(1.75rem, 3.8vw, 2.5rem);
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
  font-weight: 700;
}
.section__sub {
  color: var(--text-muted);
  margin: 0;
  max-width: 60ch;
}

.prose p {
  color: var(--text-muted);
  margin: 0 0 1rem;
}
.prose strong { color: var(--text); }

.link {
  color: var(--accent);
  border-bottom: 1px solid color-mix(in oklab, var(--accent) 40%, transparent);
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}
.link:hover { color: var(--text); border-bottom-color: var(--text); }

.notice {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

/* ---------- Project Grid ---------- */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
@media (min-width: 640px)  { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .grid { grid-template-columns: repeat(3, 1fr); } }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  /* rein präsentativ — kein Klick, kein Cursor-Pointer */
}

.card__media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--bg-elev);
}
.card__media img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.card__media .card__live {
  width: 100%; height: 100%;
  display: block;
  background:
    radial-gradient(ellipse at 30% 30%, rgba(6,182,212,0.15), transparent 60%),
    radial-gradient(ellipse at 75% 70%, rgba(168,85,247,0.15), transparent 55%),
    var(--bg-card);
  cursor: grab;
  touch-action: none;
}
.card__media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(11,17,32,0.55));
  pointer-events: none;
}

.card__body {
  padding: 1.1rem 1.15rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  flex: 1 1 auto;
}
.card__title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.005em;
}
.card__host {
  margin: -0.35rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  letter-spacing: 0.01em;
}
.card__desc {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.55;
}
.card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin-top: auto;
  padding-top: 0.6rem;
}
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.18rem 0.55rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
  background: color-mix(in oklab, var(--accent) 10%, transparent);
  color: color-mix(in oklab, var(--accent) 80%, white);
  border: 1px solid color-mix(in oklab, var(--accent) 25%, transparent);
}
.tag--wip {
  background: color-mix(in oklab, var(--accent-2) 10%, transparent);
  color: color-mix(in oklab, var(--accent-2) 75%, white);
  border-color: color-mix(in oklab, var(--accent-2) 30%, transparent);
}

/* Klick-Link & CTA wurden bewusst entfernt — Cards sind rein präsentativ.
   Ausnahme: .card--link fuer die Wuerfel-Logo-Demo (eigenstaendige Page). */
a.card.card--link {
  text-decoration: none;
  color: inherit;
  transition:
    transform var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease),
    box-shadow var(--dur-fast) var(--ease);
}
a.card.card--link:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: var(--shadow-hover);
}
a.card.card--link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}
.card__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-left: auto;
  padding: 0.18rem 0.6rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  color: var(--accent);
  background: color-mix(in oklab, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in oklab, var(--accent) 35%, transparent);
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
a.card.card--link:hover .card__cta {
  background: var(--accent);
  color: #0b1120;
}

/* Skeleton-Loader */
.card--skeleton {
  min-height: 320px;
  background:
    linear-gradient(110deg, var(--bg-card) 30%, var(--bg-card-hover) 50%, var(--bg-card) 70%) 0 0 / 200% 100%;
  animation: shimmer 1.6s linear infinite;
  border-color: var(--border);
}
@keyframes shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ---------- Reveal-on-scroll ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition:
    opacity var(--dur-slow) var(--ease),
    transform var(--dur-slow) var(--ease);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  margin-top: 4rem;
  background: color-mix(in oklab, var(--bg) 80%, black);
}
.footer__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 1.75rem 1.25rem 2.25rem;
  color: var(--text-dim);
  font-size: 0.88rem;
  display: grid;
  gap: 0.4rem;
}
.footer__legal { margin: 0; }
.footer__hint {
  margin-left: 0.5rem;
  font-size: 0.78rem;
  color: var(--text-dim);
  opacity: 0.7;
}

/* ---------- A11y: visually hidden ---------- */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Selection ---------- */
::selection {
  background: color-mix(in oklab, var(--accent) 45%, transparent);
  color: #fff;
}

/* ---------- Footer note (Präsentations-Hinweis) ---------- */
.footer__note {
  margin: 0;
  padding: 0.6rem 0.85rem;
  border-left: 3px solid color-mix(in oklab, var(--accent) 60%, transparent);
  background: color-mix(in oklab, var(--accent) 8%, transparent);
  border-radius: 0 6px 6px 0;
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.5;
}
.footer__note strong { color: var(--text); font-weight: 600; }

/* ---------- Legal pages (Impressum / Datenschutz) ---------- */
.legal {
  max-width: 820px;
  margin: 0 auto;
  padding: clamp(2rem, 6vw, 4rem) 1.25rem clamp(2rem, 4vw, 3rem);
}
.legal__inner { max-width: 100%; }
.legal__crumb {
  margin: 0 0 1.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}
.legal h1 {
  margin: 0 0 0.4rem;
  font-size: clamp(2rem, 4.5vw, 2.75rem);
  letter-spacing: -0.02em;
  font-weight: 700;
}
.legal__sub {
  margin: 0 0 2rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}
.legal h2 {
  margin: 2.25rem 0 0.5rem;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.005em;
}
.legal p, .legal ul, .legal ol {
  margin: 0 0 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
  font-size: 0.96rem;
}
.legal ul, .legal ol { padding-left: 1.25rem; }
.legal li { margin: 0.25rem 0; }
.legal strong { color: var(--text); font-weight: 600; }
.legal__addr {
  padding: 0.85rem 1rem;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.93rem;
  line-height: 1.55;
}
.legal__hint {
  font-size: 0.82rem !important;
  color: var(--text-dim) !important;
  font-style: italic;
}
.legal__meta {
  margin-top: 2.5rem !important;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem !important;
  color: var(--text-dim) !important;
}

/* ---------- Footer brands disclaimer (§ 23 MarkenG) ---------- */
.footer__brands {
  margin: 0 0 0.4rem !important;
  padding: 0;
  font-size: 0.78rem !important;
  color: var(--text-dim) !important;
  line-height: 1.5;
}