/* ===========================================================
   Arclume — Stylesheet
   Farbwelt: Weiß / Grau / Schwarz / Dunkelblau
   =========================================================== */

:root {
  /* Farben */
  --color-white: #ffffff;
  --color-bg: #ffffff;
  --color-bg-alt: #f4f5f7;
  --color-surface: #ffffff;
  --color-border: #e3e5ea;

  --color-ink: #101319;        /* fast schwarz, für Fließtext */
  --color-ink-muted: #5b6270;  /* gedämpftes Grau für Nebentext */
  --color-ink-soft: #8890a0;

  --color-navy: #0f1c3d;       /* Dunkelblau, primäre Akzentfarbe (Text/Flächen) */
  --color-navy-deep: #0a1226;  /* fast schwarz-blau, für bewusst dunkle Flächen (Footer, Cards) */
  --color-navy-light: #24365f;
  --color-heading: #0a1226;    /* Hero-Überschrift — separat von navy-deep, da diese Rolle im Dark Mode hell statt dunkel werden muss */

  --color-accent: #3355ff;     /* helles Blau als sparsamer Akzent (Links/Fokus) */

  --color-tint: 15, 28, 61;         /* RGB-Basis für dezente Flächen-Tints (Pills, Hover-Rahmen) */
  --color-bg-translucent: rgba(255, 255, 255, 0.82); /* Header-Blur-Hintergrund */

  /* Typografie */
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;

  /* Abstände */
  --container-width: 1180px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  /* Übergänge */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Dark Mode ===== */
/* Folgt automatisch der Systemeinstellung, sofern der Nutzer nicht
   über den Toggle-Button explizit eine Wahl getroffen hat (data-theme). */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0a0e1a;
    --color-bg-alt: #111726;
    --color-surface: #141b2c;
    --color-border: #262f45;

    --color-ink: #f1f3f8;
    --color-ink-muted: #a4acc4;
    --color-ink-soft: #6b7590;

    --color-navy: #6f8cff;
    --color-navy-deep: #131f42;
    --color-navy-light: #3a4f85;
    --color-heading: #f5f7fb;

    --color-accent: #7c9bff;
    --color-tint: 255, 255, 255;
    --color-bg-translucent: rgba(10, 14, 26, 0.82);
  }
}
:root[data-theme="dark"] {
  --color-bg: #0a0e1a;
  --color-bg-alt: #111726;
  --color-surface: #141b2c;
  --color-border: #262f45;

  --color-ink: #f1f3f8;
  --color-ink-muted: #a4acc4;
  --color-ink-soft: #6b7590;

  --color-navy: #6f8cff;
  --color-navy-deep: #131f42;
  --color-navy-light: #3a4f85;
  --color-heading: #f5f7fb;

  --color-accent: #7c9bff;
  --color-tint: 255, 255, 255;
  --color-bg-translucent: rgba(10, 14, 26, 0.82);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-base);
  color: var(--color-ink);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.55;
  transition: background 0.3s var(--ease), color 0.3s var(--ease);
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, p { margin: 0; }
button { font: inherit; cursor: pointer; }
input, textarea, select { font: inherit; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* ===== Skip link ===== */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-navy);
  color: #fff;
  padding: 0.75rem 1.25rem;
  z-index: 999;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; }

/* ===== Layout helpers ===== */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 24px;
}
.section { padding: clamp(64px, 9vw, 128px) 0; }
.section-alt { background: var(--color-bg-alt); }

.eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-navy);
  margin-bottom: 0.9rem;
}

.section-head { max-width: 640px; margin-bottom: clamp(40px, 6vw, 64px); }
.section-head h2, h2 { font-size: clamp(1.9rem, 3.2vw, 2.6rem); font-weight: 650; letter-spacing: -0.01em; line-height: 1.15; }
.section-intro { margin-top: 1rem; color: var(--color-ink-muted); font-size: 1.05rem; }
.section-footnote {
  margin-top: 3rem;
  font-style: italic;
  color: var(--color-ink-soft);
  font-size: 0.95rem;
  text-align: center;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.7rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-navy);
  color: #fff;
}
.btn-primary:hover { background: var(--color-navy-deep); transform: translateY(-1px); }
.btn-ghost {
  background: transparent;
  color: var(--color-navy);
  border-color: var(--color-border);
}
.btn-ghost:hover { border-color: var(--color-navy); transform: translateY(-1px); }
.btn-sm { padding: 0.6rem 1.25rem; font-size: 0.85rem; }
.btn-block { width: 100%; }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
/* Blur lives on a pseudo-element (not the header itself) so that
   backdrop-filter doesn't create a containing block for the fixed-
   position mobile nav — that would trap it inside the header's box. */
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--color-bg-translucent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  transition: background 0.3s var(--ease);
}
.site-header.is-scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: 0 4px 24px rgba(15, 28, 61, 0.05);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 24px;
}

.logo { display: flex; align-items: center; gap: 0.65rem; }
.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 9px;
  background: var(--color-navy);
  color: #fff;
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}
.logo-word { font-size: 1.15rem; font-weight: 700; letter-spacing: -0.01em; color: var(--color-ink); }
.logo-word-accent { color: var(--color-navy); font-weight: 400; }

.main-nav ul { display: flex; gap: 2.1rem; }
.main-nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-ink-muted);
  transition: color 0.2s var(--ease);
  position: relative;
}
.main-nav a:hover { color: var(--color-ink); }

.header-actions { display: flex; align-items: center; gap: 1rem; }

.lang-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 32px;
  padding: 0 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: transparent;
  color: var(--color-navy);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
  flex-shrink: 0;
}
.lang-toggle:hover {
  background: var(--color-navy);
  color: #fff;
  border-color: var(--color-navy);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: transparent;
  color: var(--color-navy);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
  flex-shrink: 0;
}
.theme-toggle:hover {
  background: var(--color-navy);
  color: #fff;
  border-color: var(--color-navy);
}
.theme-toggle svg { width: 17px; height: 17px; }
.theme-toggle .icon-moon { display: none; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  padding: 0;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-ink);
  transition: transform 0.25s var(--ease), opacity 0.25s var(--ease);
  margin-inline: auto;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: clamp(90px, 14vw, 168px) 0 clamp(70px, 10vw, 110px);
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; z-index: -1; }
.hero-grid {
  position: absolute;
  inset: -1px;
  background-image:
    linear-gradient(to right, rgba(var(--color-tint), 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(var(--color-tint), 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 20%, black 40%, transparent 90%);
}
.hero-glow {
  position: absolute;
  top: -220px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 600px;
  background: radial-gradient(closest-side, rgba(51, 85, 255, 0.18), transparent 75%);
}

.hero-inner { text-align: center; max-width: 780px; }
.hero-title {
  font-size: clamp(2.4rem, 5.4vw, 4.1rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.08;
  color: var(--color-heading);
  margin-bottom: 1.5rem;
}
.hero-subtitle {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  color: var(--color-ink-muted);
  max-width: 620px;
  margin: 0 auto 2.4rem;
}
.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin-bottom: 3rem; }

.trust-row {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.6rem 1rem;
}
.trust-row li {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-navy);
  background: rgba(var(--color-tint), 0.08);
  padding: 0.5rem 1rem;
  border-radius: 999px;
}

/* ===== Card grid (Leistungen) ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}
.card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.75rem;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(15, 28, 61, 0.08);
  border-color: rgba(var(--color-tint), 0.24);
}
.card-icon {
  width: 48px;
  height: 48px;
  color: var(--color-navy);
  margin-bottom: 1.4rem;
}
.card h3 { font-size: 1.08rem; font-weight: 650; margin-bottom: 0.6rem; letter-spacing: -0.005em; }
.card p { color: var(--color-ink-muted); font-size: 0.94rem; }
.card-badge {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--color-navy);
  background: rgba(51, 85, 255, 0.1);
  padding: 0.3rem 0.6rem;
  border-radius: 999px;
  letter-spacing: 0.03em;
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 96px);
  align-items: start;
}
.about-text h2 { margin-bottom: 1.4rem; }
.about-text p { color: var(--color-ink-muted); margin-bottom: 1rem; font-size: 1.02rem; }
.about-text p:last-child { margin-bottom: 0; }
.about-text strong { color: var(--color-ink); font-weight: 650; }

.pillars { display: flex; flex-direction: column; gap: 1.75rem; }
.pillar {
  border-top: 1px solid var(--color-border);
  padding-top: 1.5rem;
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 0.25rem 1.25rem;
}
.pillar-index {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-ink-soft);
  grid-row: span 2;
}
.pillar h3 { font-size: 1.05rem; font-weight: 650; }
.pillar p { color: var(--color-ink-muted); font-size: 0.95rem; margin-top: 0.35rem; }

/* ===== Referenzen ===== */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.case-card {
  background: var(--color-navy-deep);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 2.1rem 1.85rem;
  transition: transform 0.3s var(--ease);
}
.case-card:hover { transform: translateY(-4px); }
.case-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #9db2ff;
  background: rgba(51, 85, 255, 0.18);
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  margin-bottom: 1.1rem;
}
.case-card h3 { font-size: 1.1rem; font-weight: 650; margin-bottom: 0.75rem; line-height: 1.35; }
.case-result { color: rgba(255, 255, 255, 0.68); font-size: 0.93rem; }

/* ===== Kontakt ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(40px, 6vw, 96px);
}
.contact-intro h2 { margin-bottom: 1rem; }
.contact-intro > p { color: var(--color-ink-muted); font-size: 1.02rem; margin-bottom: 2rem; }
.contact-facts { display: flex; flex-direction: column; gap: 0.85rem; }
.contact-facts li { font-size: 0.94rem; color: var(--color-ink-muted); }
.contact-facts strong { color: var(--color-ink); font-weight: 650; }
.contact-facts a { color: var(--color-navy); font-weight: 600; }
.contact-facts a:hover { text-decoration: underline; }

.contact-form {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 3vw, 40px);
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}
.form-row { display: flex; flex-direction: column; gap: 0.5rem; }
.form-row label { font-size: 0.86rem; font-weight: 600; color: var(--color-ink); }
.form-row input,
.form-row select,
.form-row textarea {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.9rem;
  background: var(--color-bg-alt);
  color: var(--color-ink);
  resize: vertical;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--color-navy);
  background: var(--color-surface);
}
.form-row-checkbox {
  flex-direction: row;
  align-items: flex-start;
  gap: 0.65rem;
}
.form-row-checkbox input { margin-top: 0.3rem; }
.form-row-checkbox label { font-weight: 400; font-size: 0.85rem; color: var(--color-ink-muted); }
.form-row-checkbox a { color: var(--color-navy); font-weight: 600; }

.form-status {
  font-size: 0.9rem;
  font-weight: 600;
  min-height: 1.2em;
}
.form-status.success { color: #1a7a4c; }
.form-status.error { color: #c23434; }

/* ===== Footer ===== */
.site-footer {
  background: var(--color-navy-deep);
  color: rgba(255, 255, 255, 0.65);
  padding: 56px 0 28px;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.footer-brand { display: flex; align-items: center; gap: 0.85rem; }
.footer-name { color: #fff; font-weight: 700; font-size: 1.02rem; }
.footer-tagline { font-size: 0.82rem; color: rgba(255, 255, 255, 0.5); margin-top: 0.15rem; }
.footer-nav { display: flex; gap: 1.75rem; flex-wrap: wrap; }
.footer-nav a, .footer-legal a { font-size: 0.88rem; transition: color 0.2s var(--ease); }
.footer-nav a:hover, .footer-legal a:hover { color: #fff; }
.footer-legal { display: flex; gap: 1.5rem; }
.footer-social { display: flex; align-items: center; }
.social-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.75);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.social-icon svg { width: 17px; height: 17px; }
.social-icon:hover {
  background: #fff;
  color: var(--color-navy-deep);
  border-color: #fff;
}
.footer-copy { font-size: 0.8rem; padding-top: 24px; color: rgba(255, 255, 255, 0.4); }

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

/* ===== Scroll reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 980px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .case-grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .main-nav {
    position: fixed;
    inset: 76px 0 0 0;
    background: var(--color-bg);
    padding: 2rem 24px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
  }
  .main-nav.is-open { opacity: 1; transform: translateY(0); pointer-events: auto; }
  .main-nav ul { flex-direction: column; gap: 0; }
  .main-nav a { display: block; padding: 1rem 0; font-size: 1.05rem; border-bottom: 1px solid var(--color-border); }
  .nav-toggle { display: flex; }
  .header-actions .btn-sm { display: none; }
  .card-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; align-items: stretch; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}