/* ═══════════════════════════════════════════════════════════════════
   SERO Landing — „Atelier bei Nacht"
   Warmes Dunkel, Cream-Typo, ein blauer Akzent. Mobil (390) zuerst.
   ═══════════════════════════════════════════════════════════════════ */

:root {
  --bg:        #151310;   /* warmes Schwarzbraun */
  --bg-tint:   #1a1815;   /* Sektions-Wechsel, eine Nuance heller */
  --ink:       #F2EFE9;   /* Cream */
  --ink-dim:   #b7b1a6;   /* gedämpfter Text */
  --ink-faint: #7d786e;   /* Kicker, Fußnoten */
  --blue:      #1A4A8C;   /* SERO-Blau */
  --blue-hi:   #2E6FCC;   /* Interaktion, Links */
  --blue-soft: #7FA8DC;   /* Akzent-Text auf Dunkel */
  --line:      rgba(242, 239, 233, .12);
  --maxw:      1080px;
  --pad:       clamp(20px, 5vw, 48px);
  --display:   "Unbounded", system-ui, sans-serif;
  --text:      "Figtree", system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--text);
  font-size: 17px;
  line-height: 1.6;
  overflow-x: hidden;
}

::selection { background: var(--blue); color: var(--ink); }

img { display: block; max-width: 100%; height: auto; }
a { color: var(--blue-soft); }

/* Filmkorn über allem — Textur statt flacher Fläche */
.grain {
  position: fixed; inset: -50%;
  width: 200%; height: 200%;
  pointer-events: none;
  z-index: 999;
  opacity: .05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--blue); color: var(--ink);
  padding: 12px 20px; z-index: 1001; border-radius: 0 0 10px 0;
  text-decoration: none; font-weight: 600;
}
.skip:focus { left: 0; }

/* ══════════════ Header ══════════════ */

.top {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; gap: 20px;
  padding: calc(10px + env(safe-area-inset-top)) var(--pad) 10px;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; min-height: 44px; }
.brand img { height: 22px; width: auto; }
/* Das Wordmark-Asset ist blaues Chrom — klein auf Dunkel zu dunkel.
   Aufhellen per Filter statt neuem Asset. */
.brand img, .foot-row img { filter: grayscale(1) brightness(2.6) contrast(.92); }

.top-nav {
  display: none;
  gap: 6px; margin-left: auto;
}
.top-nav a {
  color: var(--ink-dim); text-decoration: none;
  font-size: 15px; font-weight: 500;
  padding: 11px 14px; border-radius: 999px;
  transition: color .2s, background-color .2s;
}
.top-nav a:hover { color: var(--ink); background: rgba(242, 239, 233, .06); }

.lang {
  margin-left: auto;
  color: var(--ink-dim); text-decoration: none;
  font-size: 13px; font-weight: 600; letter-spacing: .08em;
  min-height: 44px; display: inline-flex; align-items: center;
  padding: 0 12px; border-radius: 999px;
  transition: color .2s, background-color .2s;
}
.lang:hover { color: var(--ink); background: rgba(242, 239, 233, .06); }
@media (min-width: 720px) {
  .top-nav { display: flex; }
}

/* ══════════════ Buttons ══════════════ */

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 0 26px;
  border-radius: 999px;
  font-family: var(--text); font-size: 16px; font-weight: 600;
  text-decoration: none;
  transition: transform .18s ease, background-color .2s, border-color .2s, box-shadow .25s;
}
.btn:active { transform: scale(.97); }

.btn-primary {
  background: var(--blue); color: var(--ink);
  box-shadow: 0 8px 28px -8px rgba(26, 74, 140, .55);
}
.btn-primary:hover {
  background: var(--blue-hi);
  box-shadow: 0 10px 34px -8px rgba(46, 111, 204, .6);
  transform: translateY(-1px);
}
.btn-ghost {
  color: var(--ink);
  border: 1px solid var(--line);
  background: transparent;
}
.btn-ghost:hover { border-color: rgba(242, 239, 233, .35); background: rgba(242, 239, 233, .05); }

.btn-small { min-height: 44px; padding: 0 20px; font-size: 15px;
  background: var(--blue); color: var(--ink); }
.btn-small:hover { background: var(--blue-hi); }

/* ══════════════ Hero ══════════════ */

.hero {
  position: relative;
  min-height: 100svh;
  display: grid; place-items: center;
  padding: 90px var(--pad) 80px;
  overflow: hidden;
  isolation: isolate;
}

/* Lichtinseln: warme Bühne + tiefes Blau, kein flaches Schwarz */
.hero-light {
  position: absolute; inset: -20%;
  z-index: -1;
  background:
    radial-gradient(42% 34% at 50% 24%, rgba(46, 111, 204, .16), transparent 70%),
    radial-gradient(55% 45% at 18% 78%, rgba(26, 74, 140, .12), transparent 70%),
    radial-gradient(40% 36% at 85% 60%, rgba(120, 90, 40, .07), transparent 70%);
  will-change: transform;
}

/* SR-Signet als Lichtprägung in der Wand: das Monogramm-PNG dient als
   Alpha-Maske, gefüllt mit tiefem Blau. Alle paar Sekunden wandert ein
   schmaler Lichtschein durch die Konturen — wie Studiolicht auf Prägung.
   Zentrierung über margin, nicht transform: transform gehört dem Parallax. */
.hero-sigil {
  position: absolute; z-index: -1;
  width: 150vmin; height: 150vmin;
  top: 50%; right: -52vmin;
  margin-top: -78vmin;
  -webkit-mask: url("assets/monogram-white.png") center / contain no-repeat;
  mask: url("assets/monogram-white.png") center / contain no-repeat;
  background:
    linear-gradient(115deg,
      transparent 32%,
      rgba(127, 168, 220, .9) 50%,
      transparent 68%),
    linear-gradient(200deg,
      rgba(46, 111, 204, .55),
      rgba(26, 74, 140, .28) 55%,
      rgba(26, 74, 140, .08));
  background-size: 340% 100%, 100% 100%;
  background-position: 130% 0, 0 0;
  background-repeat: no-repeat;
  opacity: .14;
  animation: sigil-sweep 12s ease-in-out infinite;
  will-change: transform;
  pointer-events: none;
}
@keyframes sigil-sweep {
  0%, 22%   { background-position: 130% 0, 0 0; }
  62%, 100% { background-position: -60% 0, 0 0; }
}

.hero-inner {
  max-width: 660px;
  text-align: center;
  display: flex; flex-direction: column; align-items: center;
}

.hero-cam {
  width: clamp(120px, 30vw, 170px); height: auto;
  margin-bottom: 34px;
  filter: drop-shadow(0 14px 44px rgba(46, 111, 204, .35));
  will-change: transform;
}

.hero-badge {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: 13px; font-weight: 600; letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 9px 18px;
  margin-bottom: 26px;
}
.hero-badge .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--blue-hi);
}

.hero-title {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(34px, 9.2vw, 68px);
  line-height: 1.08;
  letter-spacing: -.01em;
  margin-bottom: 22px;
}
.hero-title em {
  font-style: normal;
  color: var(--blue-soft);
}

.hero-sub {
  max-width: 480px;
  color: var(--ink-dim);
  font-size: clamp(16px, 4.2vw, 19px);
  margin-bottom: 34px;
}

.hero-ctas {
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: center;
}

.hero-fade {
  position: absolute; left: 0; right: 0; bottom: 0; height: 120px;
  background: linear-gradient(transparent, var(--bg));
  pointer-events: none;
}

/* ══════════════ Sektionen ══════════════ */

.sect {
  padding: clamp(72px, 14vw, 130px) var(--pad);
  max-width: calc(var(--maxw) + 2 * 48px);
  margin: 0 auto;
  scroll-margin-top: 70px;
}
.sect-tint {
  max-width: none;
  background:
    radial-gradient(60% 50% at 80% 0%, rgba(26, 74, 140, .07), transparent 70%),
    var(--bg-tint);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.sect-tint > * { max-width: var(--maxw); margin-left: auto; margin-right: auto; }

.kicker {
  font-size: 13px; font-weight: 700;
  letter-spacing: .16em; text-transform: uppercase;
  color: var(--blue-soft);
  margin-bottom: 16px;
}

.sect-title {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(27px, 6.4vw, 46px);
  line-height: 1.14;
  margin-bottom: 20px;
  max-width: 640px;
}
.sect-sub {
  color: var(--ink-dim);
  max-width: 520px;
  margin-bottom: 40px;
}

/* ══════════════ 3 Schritte ══════════════ */

.steps {
  list-style: none;
  margin-top: clamp(36px, 7vw, 64px);
  display: grid; gap: clamp(36px, 6vw, 56px);
}
.step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 20px;
  align-items: start;
  max-width: 620px;
}
.step-nr {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(44px, 11vw, 80px);
  line-height: .9;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(127, 168, 220, .55);
  min-width: clamp(48px, 12vw, 90px);
}
.step h3 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(19px, 4.6vw, 24px);
  margin-bottom: 8px;
}
.step p { color: var(--ink-dim); max-width: 460px; }

@media (min-width: 880px) {
  .steps { grid-template-columns: repeat(3, 1fr); gap: 40px; }
  .step { grid-template-columns: 1fr; max-width: none; }
  .step-nr { margin-bottom: 14px; }
}

/* ══════════════ Was SERO vorbereitet ══════════════ */

.prep { margin-top: clamp(28px, 5vw, 48px); }
.prep-row {
  display: grid; gap: 6px;
  padding: 26px 0;
  border-top: 1px solid var(--line);
}
.prep-row:last-of-type { border-bottom: 1px solid var(--line); }
.prep-row dt {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(17px, 4.4vw, 21px);
}
.prep-row dd { color: var(--ink-dim); max-width: 560px; }

@media (min-width: 720px) {
  .prep-row { grid-template-columns: 220px 1fr; gap: 24px; align-items: baseline; }
}

.prep-note {
  margin-top: 26px;
  color: var(--ink-faint);
  font-size: 15px;
  max-width: 460px;
}

/* ══════════════ Für wen ══════════════ */

.who {
  list-style: none;
  margin-top: clamp(28px, 5vw, 48px);
}
.who li {
  display: grid; gap: 4px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}
.who li:last-child { border-bottom: 1px solid var(--line); }
.who strong {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(20px, 5.4vw, 30px);
  transition: color .2s;
}
.who li:hover strong { color: var(--blue-soft); }
.who span { color: var(--ink-faint); font-size: 15px; max-width: 560px; }

@media (min-width: 720px) {
  .who li { grid-template-columns: minmax(260px, 340px) 1fr; align-items: baseline; gap: 24px; }
}

/* ══════════════ Zeit-Vergleich ══════════════ */

.time {
  display: grid; gap: 18px;
  margin-top: clamp(28px, 5vw, 48px);
}
.time-col {
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: clamp(24px, 5vw, 36px);
}
.time-col-sero {
  border-color: rgba(46, 111, 204, .45);
  background:
    radial-gradient(90% 90% at 15% 0%, rgba(26, 74, 140, .18), transparent 70%);
}
.time-label {
  font-size: 13px; font-weight: 700;
  letter-spacing: .14em; text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 10px;
}
.time-col-sero .time-label { color: var(--blue-soft); }
.time-value {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(30px, 8vw, 52px);
  line-height: 1;
  margin-bottom: 14px;
}
.time-desc { color: var(--ink-dim); font-size: 15.5px; }

@media (min-width: 720px) {
  .time { grid-template-columns: 1fr 1fr; gap: 24px; }
}

/* ══════════════ Guide ══════════════ */

.guide {
  display: grid; gap: 18px;
  margin-top: clamp(24px, 4vw, 40px);
}
.guide-card {
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: clamp(24px, 5vw, 34px);
  background: rgba(242, 239, 233, .025);
}
.guide-card h3 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 20px;
  margin-bottom: 18px;
}
.guide-card h3 span {
  color: var(--ink-faint);
  font-family: var(--text);
  font-weight: 500;
  font-size: 15px;
  margin-left: 8px;
}
.guide-card ol {
  list-style: none;
  counter-reset: g;
  display: grid; gap: 14px;
}
.guide-card ol li {
  counter-increment: g;
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 12px;
  align-items: baseline;
  color: var(--ink-dim);
  font-size: 15.5px;
}
.guide-card ol li::before {
  content: counter(g);
  display: inline-grid; place-items: center;
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 1px solid rgba(127, 168, 220, .5);
  color: var(--blue-soft);
  font-weight: 700; font-size: 13px;
}
.guide-card a { color: var(--blue-soft); }

@media (min-width: 720px) {
  .guide { grid-template-columns: 1fr 1fr; gap: 24px; }
}

/* ══════════════ FAQ ══════════════ */

.faq {
  margin-top: clamp(24px, 4vw, 40px);
  display: grid; gap: 10px;
}
.faq details {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(242, 239, 233, .025);
  overflow: hidden;
  transition: border-color .25s, background-color .25s;
}
.faq details[open] {
  border-color: rgba(46, 111, 204, .5);
  background: rgba(26, 74, 140, .07);
}
.faq summary {
  list-style: none;
  cursor: pointer;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  min-height: 44px;
  padding: 18px 20px;
  font-weight: 600; font-size: 16.5px;
  -webkit-tap-highlight-color: transparent;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary:focus-visible {
  outline: 2px solid var(--blue-hi);
  outline-offset: -2px;
  border-radius: 16px;
}
.faq-ic {
  flex: none;
  width: 22px; height: 22px;
  position: relative;
}
.faq-ic::before, .faq-ic::after {
  content: "";
  position: absolute; inset: 0; margin: auto;
  background: var(--blue-soft);
  transition: transform .3s ease;
}
.faq-ic::before { width: 14px; height: 2px; }
.faq-ic::after  { width: 2px;  height: 14px; }
.faq details[open] .faq-ic::after { transform: rotate(90deg); }

.faq-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .35s ease;
}
.faq details[open] .faq-body { grid-template-rows: 1fr; }
.faq-body p {
  overflow: hidden;
  color: var(--ink-dim);
  padding: 0 20px;
  font-size: 15.5px;
}
.faq details[open] .faq-body p { padding-bottom: 20px; }

/* ══════════════ Final CTA ══════════════ */

.final {
  text-align: center;
  display: flex; flex-direction: column; align-items: center;
  position: relative;
}
.final::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(50% 60% at 50% 100%, rgba(26, 74, 140, .14), transparent 70%);
  pointer-events: none;
}
.final-mark {
  width: 60px; height: 60px;
  margin-bottom: 26px;
  opacity: .9;
}
.final .sect-title { max-width: none; }
.final .sect-sub { margin-bottom: 32px; }

/* ══════════════ Footer ══════════════ */

.foot {
  border-top: 1px solid var(--line);
  padding: 40px var(--pad) calc(40px + env(safe-area-inset-bottom));
  max-width: calc(var(--maxw) + 2 * 48px);
  margin: 0 auto;
  display: grid; gap: 22px;
}
.foot-row { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; }
.foot-row img { height: 18px; width: auto; opacity: .85; }
.foot-made { color: var(--ink-faint); font-size: 14px; }
.foot-nav { display: flex; flex-wrap: wrap; gap: 4px; }
.foot-nav a {
  color: var(--ink-dim); text-decoration: none;
  font-size: 15px;
  padding: 10px 14px 10px 0;
  min-height: 44px;
  display: inline-flex; align-items: center;
  transition: color .2s;
}
.foot-nav a:hover { color: var(--ink); }

@media (min-width: 720px) {
  .foot { grid-template-columns: 1fr auto; align-items: center; }
}

/* ══════════════ Motion ══════════════ */

.reveal {
  opacity: 0;
  transform: translateY(26px);
  filter: blur(3px);
  transition: opacity .7s ease, transform .7s ease, filter .7s ease;
  transition-delay: var(--d, 0s);
}
.reveal.in {
  opacity: 1;
  transform: none;
  filter: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; filter: none; transition: none; }
  .btn, .faq-ic::before, .faq-ic::after, .faq-body { transition: none; }
  .hero-light, .hero-cam, .hero-sigil { transform: none !important; }
  .hero-sigil { animation: none; background-position: 50% 0, 0 0; }
}