/* VisuStruct web — Akzente aus App-Icon (PNG) gesampelt: z. B. #76d3fe (hell) → #2e8cee / #2c78cf (tief) */
:root {
  --vs-bg-deep: #0a1628;
  --vs-bg-mid: #0f2847;
  --vs-accent: #2e8cee;
  --vs-accent-bright: #76d3fe;
  --vs-accent-dim: #2c78cf;
  --vs-accent-glow: rgba(118, 211, 254, 0.28);
  --vs-blue: #2568b8;
  --vs-text: #f8fafc;
  --vs-text-muted: #94a3b8;
  --vs-card: rgba(15, 40, 72, 0.72);
  --vs-card-border: rgba(148, 163, 184, 0.14);
  --vs-radius: 20px;
  --vs-font: "DM Sans", system-ui, -apple-system, sans-serif;
  /* Eine Spalte mit Screenshots, Hero-Text und Screenshot-Überschriften */
  --vs-prose-max: min(920px, 100%);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--vs-font);
  color: var(--vs-text);
  background: var(--vs-bg-deep);
  background-image:
    radial-gradient(ellipse 120% 70% at 50% -15%, rgba(164, 223, 248, 0.2), transparent),
    radial-gradient(ellipse 70% 55% at 95% 40%, rgba(118, 211, 254, 0.18), transparent),
    linear-gradient(195deg, #0f3460 0%, var(--vs-bg-deep) 50%, #070d16 100%);
  -webkit-font-smoothing: antialiased;
}

/* Explizit: manche WebKit-Versionen erben keine sichtbare Farbe auf main */
main {
  color: var(--vs-text);
}

a {
  color: var(--vs-accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.wrap {
  width: min(1100px, calc(100% - 1.25rem));
  margin: 0 auto;
}

/* Header */
.site-header {
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--vs-card-border);
  /* kein backdrop-filter: kann in Safari/iOS Inhalt „verschwinden“ lassen */
  background: rgba(10, 22, 40, 0.97);
  position: sticky;
  top: 0;
  z-index: 20;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--vs-text);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}
.brand:hover {
  text-decoration: none;
  color: var(--vs-accent-bright);
}

.brand img,
.brand svg {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
}

/* Offizielles App-Icon (PNG), Squircle-Anmutung wie auf dem Gerät */
.brand-icon-img {
  border-radius: 22%;
  box-shadow:
    0 4px 16px rgba(8, 47, 73, 0.35),
    0 0 0 1px rgba(255, 255, 255, 0.12);
  object-fit: cover;
}

.lang-switch {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
  align-items: center;
}
.lang-switch a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--vs-text-muted);
  text-decoration: none;
  border: 1px solid transparent;
}
.lang-switch a:hover {
  color: var(--vs-text);
  background: rgba(148, 163, 184, 0.1);
}
.lang-switch a[aria-current="page"] {
  color: #fff;
  background: linear-gradient(135deg, var(--vs-accent-bright), var(--vs-accent-dim));
  border-color: transparent;
}

.header-nav-block {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.45rem;
}
.header-subnav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  justify-content: flex-end;
}
.header-subnav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.2rem 0;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--vs-text-muted);
  text-decoration: none;
}
.header-subnav a:hover {
  color: var(--vs-accent-bright);
  text-decoration: none;
}

#download,
#privacy,
#contact {
  scroll-margin-top: 4.5rem;
}

/* Hero */
.hero {
  padding: 1.65rem 0 2rem;
  text-align: center;
}

/* Großes Markenzeichen: visueller Anker gegen zu viel Fließtext */
.hero-logo-wrap {
  display: flex;
  justify-content: center;
  margin: 0 auto 1.35rem;
  position: relative;
  width: fit-content;
  max-width: 100%;
}
.hero-logo-wrap::before {
  content: "";
  position: absolute;
  inset: -18%;
  border-radius: 30%;
  background: radial-gradient(
    circle at 50% 45%,
    rgba(118, 211, 254, 0.45) 0%,
    rgba(29, 78, 216, 0.12) 45%,
    transparent 70%
  );
  filter: blur(22px);
  z-index: 0;
  pointer-events: none;
}
.hero-logo-img {
  position: relative;
  z-index: 1;
  width: clamp(112px, 30vw, 176px);
  height: auto;
  aspect-ratio: 1;
  border-radius: 22%;
  object-fit: cover;
  box-shadow:
    0 12px 48px rgba(8, 47, 73, 0.55),
    0 0 0 1px rgba(255, 255, 255, 0.16),
    0 0 60px rgba(118, 211, 254, 0.22);
}

.hero h1 {
  margin: 0 auto 1rem;
  max-width: var(--vs-prose-max);
  font-size: clamp(1.55rem, 5.2vw + 0.35rem, 2.85rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--vs-text);
}

.hero-lead {
  margin: 0 auto 2rem;
  max-width: 38rem;
  font-size: 1.125rem;
  color: var(--vs-text-muted);
  line-height: 1.55;
}

.hero .content-prose {
  text-align: left;
  max-width: var(--vs-prose-max);
  margin-left: auto;
  margin-right: auto;
}

/* App screenshots (Java desktop · SwiftUI Mac / iPad) */
.section-screenshot {
  padding: 0 0 2.15rem;
  text-align: center;
}
.section-screenshot + .section-screenshot {
  border-top: 1px solid var(--vs-card-border);
  padding-top: 2rem;
  margin-top: 0;
}
.section-screenshot .screenshot-heading {
  font-size: 1.2rem;
  margin: 0 auto 0.5rem;
  max-width: var(--vs-prose-max);
  color: var(--vs-text);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.screenshot-lead {
  max-width: var(--vs-prose-max);
  margin: 0 auto 1.25rem;
  font-size: 0.92rem;
  color: var(--vs-text-muted);
  line-height: 1.55;
}
.app-screenshot-frame {
  margin: 0 auto;
  max-width: var(--vs-prose-max);
  padding: 0;
  border-radius: 14px;
  background: rgba(15, 40, 72, 0.55);
  border: 1px solid var(--vs-card-border);
  box-shadow:
    0 28px 70px rgba(0, 0, 0, 0.4),
    0 0 0 1px rgba(255, 255, 255, 0.06) inset;
  overflow: hidden;
}
.app-screenshot-frame img {
  display: block;
  width: 100%;
  height: auto;
  vertical-align: middle;
}
.app-screenshot-frame figcaption {
  padding: 0.7rem 0.85rem 0.9rem;
  font-size: 0.78rem;
  color: var(--vs-text-muted);
  line-height: 1.45;
  border-top: 1px solid var(--vs-card-border);
  background: rgba(10, 22, 40, 0.72);
}

/* Cards grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: 1.15rem;
  padding: 0.65rem 0 2.75rem;
}

.card {
  padding: 1.35rem;
  border-radius: var(--vs-radius);
  background: rgba(20, 48, 82, 0.92);
  border: 1px solid var(--vs-card-border);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.card:hover {
  transform: translateY(-3px);
  border-color: rgba(118, 211, 254, 0.35);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.28);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 1rem;
}
.card-icon.java {
  background: linear-gradient(135deg, #f97316, #ea580c);
}
.card-icon.ios {
  background: linear-gradient(160deg, var(--vs-accent-bright), var(--vs-accent-dim));
}

.card h2 {
  margin: 0 0 0.5rem;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  color: var(--vs-text);
}

.card p {
  margin: 0 0 1.25rem;
  color: var(--vs-text-muted);
  font-size: 0.95rem;
  line-height: 1.55;
  flex: 1;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 44px;
  padding: 0.65rem 1rem;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.88rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  touch-action: manipulation;
  transition: transform 0.15s ease, filter 0.15s ease;
}
.btn:hover {
  text-decoration: none;
  filter: brightness(1.08);
  transform: scale(1.02);
}
.btn-primary {
  background: linear-gradient(135deg, var(--vs-accent-bright), var(--vs-accent-dim));
  color: #fff;
}
.btn-secondary {
  background: rgba(148, 163, 184, 0.15);
  color: var(--vs-text);
  border: 1px solid var(--vs-card-border);
}

/* Marketing copy */
.content-prose {
  max-width: 40rem;
  margin: 0 auto 2.5rem;
  text-align: left;
}
.content-prose p {
  margin: 0 0 1.1rem;
  color: var(--vs-text-muted);
  line-height: 1.65;
  font-size: 1rem;
}
.content-prose p:last-child {
  margin-bottom: 0;
}
.lead-kicker {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--vs-text);
  margin-bottom: 1rem !important;
}
.section-block {
  padding: 1.85rem 0;
  border-top: 1px solid var(--vs-card-border);
}
.section-block > h2 {
  text-align: center;
  font-size: 1.2rem;
  margin: 0 0 1.25rem;
  color: var(--vs-text);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.bullet-list {
  max-width: 38rem;
  margin: 0 auto;
  padding-left: 1.15rem;
  color: var(--vs-text-muted);
  line-height: 1.65;
  font-size: 0.92rem;
}
.bullet-list li {
  margin-bottom: 0.55rem;
}
.tagline-close {
  text-align: center;
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--vs-text);
  line-height: 1.5;
  padding: 2rem 1rem 1rem;
  max-width: 34rem;
  margin: 0 auto;
}
.section-downloads h2 {
  text-align: center;
  font-size: 1.1rem;
  margin: 0 0 1.25rem;
  color: var(--vs-text-muted);
  font-weight: 600;
}
.section-downloads > h2::after {
  content: "";
  display: block;
  width: 52px;
  height: 3px;
  margin: 0.7rem auto 0;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--vs-accent-bright), var(--vs-accent-dim));
  opacity: 0.85;
}
.section-downloads .grid {
  padding-top: 0;
  align-items: stretch;
  gap: 1.25rem;
}

/* Download-Karten: mehr Tiefe, einheitliche Icons, gestapelte Buttons */
.section-downloads .card {
  padding: 1.5rem 1.25rem 1.5rem;
  background: linear-gradient(
    165deg,
    rgba(36, 66, 106, 0.4) 0%,
    rgba(14, 34, 62, 0.92) 48%,
    rgba(7, 18, 36, 0.98) 100%
  );
  border: 1px solid rgba(164, 223, 248, 0.16);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.06) inset,
    0 18px 50px rgba(0, 0, 0, 0.38);
}
.section-downloads .card:hover {
  border-color: rgba(118, 211, 254, 0.4);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.08) inset,
    0 22px 60px rgba(0, 0, 0, 0.45);
}
.section-downloads .card-icon {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  font-size: 1.5rem;
  margin-bottom: 1.15rem;
  background: rgba(6, 18, 36, 0.8);
  border: 1px solid rgba(148, 163, 184, 0.22);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}
.section-downloads .card-icon.java {
  background: linear-gradient(150deg, rgba(194, 65, 12, 0.55) 0%, rgba(42, 18, 10, 0.9) 100%);
  border-color: rgba(251, 146, 60, 0.38);
}
.section-downloads .card-icon.ios {
  background: linear-gradient(150deg, rgba(37, 99, 235, 0.45) 0%, rgba(15, 35, 68, 0.92) 100%);
  border-color: rgba(164, 223, 248, 0.35);
}
.section-downloads .card h2 {
  font-size: 1.2rem;
  margin-bottom: 0.65rem;
}
.section-downloads .card p {
  font-size: 0.9rem;
  line-height: 1.58;
  margin-bottom: 1.35rem;
}
.section-downloads .btn-row {
  flex-direction: column;
  flex-wrap: nowrap;
  gap: 0.55rem;
  margin-top: auto;
  width: 100%;
}
.section-downloads .btn-row .btn {
  width: 100%;
  justify-content: center;
  box-sizing: border-box;
}

/* Footer */
.site-footer {
  padding: 1.65rem 0 2.15rem;
  border-top: 1px solid var(--vs-card-border);
  text-align: center;
  font-size: 0.8rem;
  color: var(--vs-text-muted);
}
.site-footer a {
  color: var(--vs-text-muted);
}
.site-footer a:hover {
  color: var(--vs-accent-bright);
}

/* Datenschutz / Privacy (VisuStruct) */
.privacy-policy {
  padding: 2rem 0;
  border-top: 1px solid var(--vs-card-border);
}
.privacy-policy > h2 {
  font-size: 1.2rem;
  margin: 0 0 1.25rem;
  color: var(--vs-text);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-align: center;
  line-height: 1.25;
}
.privacy-policy-body {
  max-width: 42rem;
  margin: 0 auto;
  text-align: left;
}
.privacy-policy-body h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--vs-text);
  margin: 1.5rem 0 0.65rem;
}
.privacy-policy-body h3:first-child {
  margin-top: 0;
}
.privacy-policy-body p {
  margin: 0 0 1rem;
  color: var(--vs-text-muted);
  font-size: 0.9rem;
  line-height: 1.65;
}
.privacy-policy-body p:last-child {
  margin-bottom: 0;
}

.privacy-lead {
  margin: 0 0 1.5rem;
  padding: 1rem 1.1rem 1.05rem 1.15rem;
  border-left: 3px solid var(--vs-accent-bright);
  border-radius: 0 12px 12px 0;
  background: rgba(118, 211, 254, 0.09);
  color: var(--vs-text);
  font-size: 1rem;
  line-height: 1.62;
}
.privacy-lead strong {
  color: var(--vs-text);
}

.site-contact {
  padding: 1.85rem 0 2.15rem;
  border-top: 1px solid var(--vs-card-border);
}
.site-contact h2 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--vs-text);
  margin: 0 0 0.65rem;
  text-align: center;
}
.site-contact p {
  max-width: 36rem;
  margin: 0 auto;
  text-align: center;
  color: var(--vs-text-muted);
  font-size: 0.9rem;
  line-height: 1.55;
}
.site-contact .site-author {
  margin-bottom: 1rem;
  color: var(--vs-text);
}
.site-contact .site-author strong {
  font-weight: 700;
}

/* Mobile first: ab größerer Viewport mehr Luft & Lesegrößen */
@media (min-width: 480px) {
  .wrap {
    width: min(1100px, calc(100% - 1.75rem));
  }

  .site-header {
    padding: 1.05rem 0;
  }

  #download,
  #privacy,
  #contact {
    scroll-margin-top: 5rem;
  }

  .brand {
    gap: 0.75rem;
    font-size: 1.22rem;
  }

  .brand img,
  .brand svg {
    width: 48px;
    height: 48px;
  }

  .hero {
    padding: 2.1rem 0 2.2rem;
  }

  .hero-logo-wrap {
    margin-bottom: 1.55rem;
  }

  .hero h1 {
    font-size: clamp(1.7rem, 4.6vw + 0.45rem, 2.85rem);
  }

  .lead-kicker {
    font-size: 1.1rem;
  }

  .content-prose p {
    font-size: 1.025rem;
  }

  .section-screenshot {
    padding: 0 0 2.45rem;
  }

  .section-screenshot + .section-screenshot {
    padding-top: 2.25rem;
  }

  .section-screenshot .screenshot-heading {
    font-size: 1.28rem;
  }

  .screenshot-lead {
    margin-bottom: 1.4rem;
    font-size: 0.95rem;
  }

  .app-screenshot-frame {
    border-radius: 17px;
  }

  .app-screenshot-frame figcaption {
    padding: 0.8rem 0.95rem 0.95rem;
    font-size: 0.8rem;
  }

  .grid {
    gap: 1.35rem;
    padding: 0.85rem 0 3.1rem;
  }

  .card {
    padding: 1.55rem;
  }

  .card h2 {
    font-size: 1.28rem;
  }

  .btn {
    font-size: 0.89rem;
    padding: 0.65rem 1.1rem;
  }

  .section-block {
    padding: 2rem 0;
  }

  .section-block > h2 {
    font-size: 1.28rem;
  }

  .bullet-list {
    padding-left: 1.25rem;
    font-size: 0.95rem;
  }

  .section-downloads .grid {
    gap: 1.55rem;
  }

  .section-downloads .card {
    padding: 1.75rem 1.5rem 1.65rem;
  }

  .section-downloads h2 {
    font-size: 1.18rem;
  }

  .privacy-policy {
    padding: 2.25rem 0;
  }

  .privacy-policy > h2 {
    font-size: 1.28rem;
  }

  .privacy-policy-body p {
    font-size: 0.92rem;
  }

  .site-contact {
    padding: 2rem 0 2.35rem;
  }

  .site-contact h2 {
    font-size: 1.1rem;
  }

  .site-contact p {
    font-size: 0.92rem;
  }

  .site-footer {
    padding: 1.85rem 0 2.35rem;
    font-size: 0.82rem;
  }
}

@media (min-width: 768px) {
  .wrap {
    width: min(1100px, calc(100% - 2.5rem));
  }

  .site-header {
    padding: 1.25rem 0;
  }

  #download,
  #privacy,
  #contact {
    scroll-margin-top: 5.5rem;
  }

  .brand {
    gap: 0.85rem;
    font-size: 1.3rem;
  }

  .brand img,
  .brand svg {
    width: 52px;
    height: 52px;
  }

  .hero {
    padding: 2.75rem 0 2.5rem;
  }

  .hero-logo-wrap {
    margin-bottom: 1.75rem;
  }

  .hero h1 {
    font-size: clamp(2rem, 5vw, 2.85rem);
  }

  .lead-kicker {
    font-size: 1.15rem;
  }

  .content-prose p {
    font-size: 1.05rem;
  }

  .section-screenshot {
    padding: 0 0 2.75rem;
  }

  .section-screenshot + .section-screenshot {
    padding-top: 2.5rem;
  }

  .section-screenshot .screenshot-heading {
    font-size: 1.35rem;
  }

  .screenshot-lead {
    margin-bottom: 1.5rem;
    font-size: 0.98rem;
  }

  .app-screenshot-frame {
    border-radius: var(--vs-radius);
  }

  .app-screenshot-frame figcaption {
    padding: 0.85rem 1rem 1rem;
    font-size: 0.82rem;
  }

  .grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    padding: 1rem 0 3.5rem;
  }

  .card {
    padding: 1.75rem;
  }

  .card h2 {
    font-size: 1.35rem;
  }

  .btn {
    font-size: 0.9rem;
    padding: 0.65rem 1.15rem;
  }

  .section-block {
    padding: 2.25rem 0;
  }

  .section-block > h2 {
    font-size: 1.35rem;
  }

  .bullet-list {
    padding-left: 1.35rem;
    font-size: 0.98rem;
  }

  .section-downloads .grid {
    gap: 1.75rem;
  }

  .section-downloads .card {
    padding: 2rem 1.75rem 1.85rem;
  }

  .section-downloads h2 {
    font-size: 1.25rem;
  }

  .privacy-policy {
    padding: 2.5rem 0;
  }

  .privacy-policy > h2 {
    font-size: 1.35rem;
  }

  .privacy-policy-body p {
    font-size: 0.95rem;
  }

  .site-contact {
    padding: 2.25rem 0 2.5rem;
  }

  .site-contact h2 {
    font-size: 1.15rem;
  }

  .site-contact p {
    font-size: 0.95rem;
  }

  .site-footer {
    padding: 2rem 0 2.5rem;
    font-size: 0.85rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}