/* ============================================================
   SERGIN GROUP — Design Tokens
   ============================================================ */
@font-face {
  font-family: 'Comfortaa';
  src: url('../assets/fonts/Comfortaa-Variable.woff2') format('woff2-variations'),
       url('../assets/fonts/Comfortaa-Variable.woff2') format('woff2');
  font-weight: 300 700;
  font-style: normal;
  font-display: swap;
}

:root{
  --color-ink:      #0b0b0c;
  --color-ink-soft:  #17171a;
  --color-paper:     #f7f5f0;
  --color-paper-alt: #ffffff;
  --color-gold:      #fbbb04;
  --color-gold-dim:  #caa233;
  --color-line:      rgba(11,11,12,0.12);
  --color-line-dark: rgba(247,245,240,0.14);
  --color-text-muted: #6b6a64;

  --font-display: 'Comfortaa', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body: 'Comfortaa', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.75rem;
  --space-lg: 3rem;
  --space-xl: 6rem;
  --space-2xl: 10rem;

  --radius-sm: 4px;
  --radius-md: 10px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --motion-fast: 180ms;
  --motion-normal: 420ms;
  --motion-slow: 900ms;

  --container: 1280px;
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *, *::before, *::after{ animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

body{
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img{ max-width: 100%; display: block; }
a{ color: inherit; text-decoration: none; }

.container{
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-md);
}
@media (max-width: 640px){
  .container{ padding-inline: 1.25rem; }
}

.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;
}

.skip-link{
  position:absolute; left:-999px; top:auto;
  background:var(--color-gold); color:var(--color-ink);
  padding:0.75rem 1.25rem; z-index:200; font-weight:600;
}
.skip-link:focus{ left: var(--space-md); top: var(--space-md); }

:focus-visible{
  outline: 2px solid var(--color-gold);
  outline-offset: 3px;
}

/* ============================================================
   Typography
   ============================================================ */
h1, h2, h3{
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
}

h2.section-title{
  font-size: clamp(2rem, 4.6vw, 3.4rem);
  line-height: 1.08;
  max-width: 18ch;
}

.lede{
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  line-height: 1.7;
  color: var(--color-text-muted);
  max-width: 58ch;
}
.lede-sub{
  margin-top: var(--space-md);
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-text-muted);
}
.lede-sub strong{ color: var(--color-ink); font-weight: 600; }

.portfolio-note{
  margin-top: var(--space-lg);
  font-size: 0.9rem;
  color: rgba(255,255,255,0.42);
}

/* ============================================================
   Nav
   ============================================================ */
.site-header{
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 100;
  padding-block: 1.1rem;
  transition: background-color var(--motion-normal) var(--ease-out),
              border-color var(--motion-normal) var(--ease-out),
              padding-block var(--motion-normal) var(--ease-out);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled{
  background: rgba(11,11,12,0.86);
  backdrop-filter: blur(10px) saturate(140%);
  -webkit-backdrop-filter: blur(10px) saturate(140%);
  border-color: var(--color-line-dark);
  padding-block: 0.75rem;
}
.site-header .container{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}
.brand-mark{
  display: inline-flex;
  align-items: center;
}
.brand-mark img{
  height: 28px;
  width: auto;
  display: block;
}
.nav-links{
  display: flex;
  gap: var(--space-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a{
  color: rgba(255,255,255,0.78);
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
  padding-block: 0.25rem;
  transition: color var(--motion-fast) var(--ease-out);
}
.nav-links a::after{
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--color-gold);
  transition: right var(--motion-normal) var(--ease-out);
}
.nav-links a:hover{ color: #fff; }
.nav-links a:hover::after{ right: 0; }

@media (max-width: 720px){
  .nav-links{ display: none; }
}

/* ============================================================
   Hero
   ============================================================ */
.hero{
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  background: var(--color-ink);
  color: #fff;
  overflow: hidden;
  padding-top: 6rem;
  padding-bottom: var(--space-lg);
}

.hero-grid{
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--color-line-dark) 1px, transparent 1px),
    linear-gradient(to bottom, var(--color-line-dark) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, black 40%, transparent 85%);
  opacity: 0.6;
}

.hero-glow{
  position: absolute;
  top: -20%;
  right: -10%;
  width: 60vw;
  height: 60vw;
  max-width: 900px;
  max-height: 900px;
  background: radial-gradient(circle, rgba(251,187,4,0.16) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content{
  position: relative;
  z-index: 2;
  margin-block: auto;
}

.hero-title{
  font-size: clamp(2.1rem, 8.4vw, 7.5rem);
  line-height: 1.02;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  margin: 0;
}
.hero-line{
  display: block;
  text-wrap: balance;
}
.hero-line.accent{ color: var(--color-gold); }

/* Split-text word reveal: plain CSS transition triggered by a JS class toggle.
   Without JS (.js absent on <html>), words are simply visible — no flash, no dependency. */
.js .word{
  display: inline-block;
  overflow: hidden;
  vertical-align: top;
}
.js .word-inner{
  display: inline-block;
  opacity: 0;
  transform: translateY(110%);
  transition: transform 0.8s var(--ease-out), opacity 0.6s ease-out;
}
.js .hero-title.is-in .word-inner{
  opacity: 1;
  transform: translateY(0);
}

@keyframes heroIn{
  from{ opacity: 0; transform: translateY(16px); }
  to{ opacity: 1; transform: translateY(0); }
}

/* Scroll progress bar */
.scroll-progress{
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--color-gold);
  transform: scaleX(0);
  transform-origin: left center;
  z-index: 300;
  pointer-events: none;
}

/* Subtle grain overlay for tactile depth (rule 41 of the global system) */
body::after{
  content: "";
  position: fixed;
  inset: 0;
  z-index: 250;
  pointer-events: none;
  opacity: 0.035;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='120' height='120'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}

.hero-tagline{
  margin-top: var(--space-lg);
  max-width: 46ch;
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  line-height: 1.65;
  color: rgba(255,255,255,0.72);
  opacity: 0;
  animation: heroIn 0.8s var(--ease-out) forwards;
  animation-delay: 380ms;
}

.hero-actions{
  margin-top: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  opacity: 0;
  animation: heroIn 0.8s var(--ease-out) forwards;
  animation-delay: 480ms;
}

/* Signature moment: rotating seal, the one deliberate ambient motion on the page */
.hero-seal{
  position: absolute;
  right: var(--space-md);
  bottom: var(--space-xl);
  width: clamp(96px, 12vw, 168px);
  height: auto;
  z-index: 2;
  opacity: 0.9;
}
.seal-rotor{
  transform-origin: 100px 100px;
  animation: sealSpin 48s linear infinite;
}
@keyframes sealSpin{ to{ transform: rotate(360deg); } }
.seal-ring{
  fill: none;
  stroke: rgba(251,187,4,0.35);
  stroke-width: 1;
}
.seal-text{
  font-family: var(--font-display);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  fill: var(--color-gold);
}
.seal-center-ring{
  fill: var(--color-ink);
  stroke: rgba(251,187,4,0.5);
  stroke-width: 1;
}
.seal-mark{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 30px;
  fill: var(--color-gold);
}
@media (max-width: 720px){
  .hero-seal{ display: none; }
}

.btn{
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.95rem 1.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--motion-fast) var(--ease-out), background-color var(--motion-fast) var(--ease-out), border-color var(--motion-fast) var(--ease-out), color var(--motion-fast) var(--ease-out);
}
.btn-primary{
  background: var(--color-gold);
  color: var(--color-ink);
}
.btn-primary:hover{
  transform: translateY(-2px);
  background: #ffc933;
}
.btn-ghost{
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.28);
}
.btn-ghost:hover{
  border-color: var(--color-gold);
  color: var(--color-gold);
  transform: translateY(-2px);
}
.btn .arrow{ transition: transform var(--motion-fast) var(--ease-out); }
.btn:hover .arrow{ transform: translateX(3px); }

.hero-meta{
  position: relative;
  z-index: 2;
  margin-top: var(--space-lg);
}
.hero-meta .container{
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--space-md);
  flex-wrap: wrap;
}
.hero-companies-count{
  font-family: var(--font-display);
  color: rgba(255,255,255,0.5);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
}
.hero-companies-count strong{
  color: var(--color-gold);
  font-size: 1.1rem;
}
.scroll-cue{
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: rgba(255,255,255,0.55);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.scroll-cue .line{
  width: 1px;
  height: 28px;
  background: linear-gradient(to bottom, var(--color-gold), transparent);
  animation: cue-pulse 2.2s var(--ease-out) infinite;
}
@keyframes cue-pulse{
  0%{ opacity: 0.2; transform: scaleY(0.4); transform-origin: top; }
  50%{ opacity: 1; transform: scaleY(1); transform-origin: top; }
  100%{ opacity: 0.2; transform: scaleY(0.4); transform-origin: top; }
}

/* ============================================================
   About / Intro strip
   ============================================================ */
.intro{
  padding-block: var(--space-xl) var(--space-lg);
  background: var(--color-paper);
}
.intro-grid{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}
@media (max-width: 860px){
  .intro-grid{ grid-template-columns: 1fr; gap: var(--space-lg); }
}
.intro-stats{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-lg);
}
.stat-num{
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  color: var(--color-ink);
}
.stat-label{
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 0.35rem;
}

/* ============================================================
   Portfolio
   ============================================================ */
.portfolio{
  padding-block: var(--space-xl);
  background: var(--color-ink);
  color: #fff;
  position: relative;
}
.portfolio .section-title{ color: #fff; }
.portfolio .lede{ color: rgba(255,255,255,0.6); }

.portfolio-head{
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--space-lg);
  flex-wrap: wrap;
  margin-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-line-dark);
  padding-bottom: var(--space-lg);
}

.portfolio-grid{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--color-line-dark);
  border: 1px solid var(--color-line-dark);
  perspective: 1200px;
}
@media (max-width: 980px){
  .portfolio-grid{ grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 620px){
  .portfolio-grid{ grid-template-columns: 1fr; }
}

.company-card{
  background: var(--color-ink-soft);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  min-height: 320px;
  position: relative;
  transition: background-color var(--motion-normal) var(--ease-out);
}
/* Reveal is opacity-only on purpose: the 3D tilt effect (main.js) owns
   `transform` on this element continuously, so the reveal must not also
   animate transform — the two would fight for the same property. */
.js .company-card{
  opacity: 0;
  transition: opacity 0.7s var(--ease-out), background-color var(--motion-normal) var(--ease-out);
}
.js .company-card.is-visible{
  opacity: 1;
}
.company-card:hover{
  background: #1e1e22;
}
.company-card-top{
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}
.company-index{
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--color-gold-dim);
  letter-spacing: 0.08em;
}
.company-arrow{
  width: 34px; height: 34px;
  border-radius: 50%;
  border: 1px solid var(--color-line-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--motion-normal) var(--ease-out), border-color var(--motion-normal) var(--ease-out), background-color var(--motion-normal) var(--ease-out);
  flex-shrink: 0;
}
.company-card:hover .company-arrow{
  transform: rotate(45deg);
  border-color: var(--color-gold);
  background: var(--color-gold);
}
.company-card:hover .company-arrow svg{ color: var(--color-ink); }
.company-arrow svg{ width: 14px; height: 14px; color: #fff; transition: color var(--motion-fast); }

.company-logo{
  background: #fff;
  border-radius: var(--radius-sm);
  padding: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 96px;
  overflow: hidden;
}
.company-logo img{
  max-height: 100%;
  width: auto;
  object-fit: contain;
  transition: transform var(--motion-normal) var(--ease-out);
}
.company-card:hover .company-logo img{
  transform: scale(1.06);
}

.company-body{ margin-top: auto; }
.company-name{
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}
.company-desc{
  font-size: 0.9rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.55;
}

.company-card-link{
  position: absolute;
  inset: 0;
}

/* ============================================================
   Approach strip
   ============================================================ */
.approach{
  padding-block: var(--space-xl);
  background: var(--color-paper-alt);
}
.approach-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}
@media (max-width: 860px){
  .approach-grid{ grid-template-columns: 1fr; }
}
.approach-item{
  border-top: 1px solid var(--color-line);
  padding-top: var(--space-md);
}
.approach-item h3{
  font-size: 1.2rem;
  margin-top: 0;
  margin-bottom: 0.5rem;
}
.approach-item p{
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
  margin: 0;
}

/* ============================================================
   CTA band
   ============================================================ */
.cta-band{
  background: var(--color-gold);
  color: var(--color-ink);
  padding-block: var(--space-lg);
}
.cta-band .container{
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}
.cta-band h2{
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  max-width: 22ch;
}
.cta-band .btn-primary{
  background: var(--color-ink);
  color: #fff;
}
.cta-band .btn-primary:hover{
  background: #000;
}
.cta-band .btn-ghost{
  color: var(--color-ink);
  border-color: rgba(11,11,12,0.35);
}
.cta-band .btn-ghost:hover{
  border-color: var(--color-ink);
  color: var(--color-ink);
  background: rgba(11,11,12,0.08);
}
.cta-address{
  margin-top: 0.6rem;
  font-size: 0.95rem;
  color: rgba(11,11,12,0.72);
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer{
  background: var(--color-ink);
  color: rgba(255,255,255,0.6);
  padding-block: var(--space-lg) var(--space-md);
}
.footer-top{
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-line-dark);
}
@media (max-width: 780px){
  .footer-top{ grid-template-columns: 1fr; gap: var(--space-md); }
}
.footer-brand .brand-mark{ margin-bottom: var(--space-sm); }
.footer-brand p{
  max-width: 40ch;
  font-size: 0.9rem;
  line-height: 1.6;
}
.footer-col h4{
  font-family: var(--font-display);
  color: #fff;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 0 0 var(--space-sm);
}
.footer-col ul{
  list-style: none;
  margin: 0; padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.footer-col a{
  font-size: 0.9rem;
  transition: color var(--motion-fast) var(--ease-out);
}
.footer-col a:hover{ color: var(--color-gold); }

.footer-bottom{
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  padding-top: var(--space-md);
  font-size: 0.82rem;
}
.footer-bottom a:hover{ color: var(--color-gold); }
.footer-legal{
  display: flex;
  gap: var(--space-md);
  list-style: none;
  margin: 0; padding: 0;
}

/* ============================================================
   Legal pages (impressum / datenschutz)
   ============================================================ */
.legal-page{
  background: var(--color-paper);
  min-height: 100vh;
}
.legal-hero{
  background: var(--color-ink);
  color: #fff;
  padding-block: 9rem var(--space-lg);
}
.legal-hero h1{
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
}
.legal-body{
  padding-block: var(--space-lg) var(--space-xl);
  max-width: 76ch;
}
.legal-body h2{
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin-top: var(--space-lg);
  margin-bottom: 0.75rem;
}
.legal-body h2:first-child{ margin-top: 0; }
.legal-body p, .legal-body li{
  color: var(--color-ink);
  line-height: 1.75;
}
.legal-notice{
  background: #fff4d6;
  border: 1px solid #e8c46a;
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-lg);
  font-size: 0.95rem;
}
.legal-notice strong{ display: block; margin-bottom: 0.4rem; }
.placeholder{
  background: rgba(251,187,4,0.25);
  padding: 0.1em 0.4em;
  border-radius: 3px;
  font-style: italic;
}

/* ============================================================
   Mouse spotlight — soft glow that follows the pointer on the
   hero, position driven by JS via --mx/--my custom properties
   ============================================================ */
.hero-spotlight{
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s ease;
  background: radial-gradient(480px circle at var(--mx, 50%) var(--my, 50%), rgba(251,187,4,0.14), transparent 70%);
}
.hero.spotlight-active .hero-spotlight{ opacity: 1; }

/* ============================================================
   Marquee band
   ============================================================ */
.marquee{
  background: var(--color-ink-soft);
  border-block: 1px solid var(--color-line-dark);
  overflow: hidden;
  padding-block: 1.1rem;
}
.marquee-track{
  display: flex;
  width: max-content;
  animation: marqueeScroll 26s linear infinite;
}
.marquee-track span{
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-gold-dim);
  padding-inline: var(--space-lg);
  white-space: nowrap;
  position: relative;
}
.marquee-track span::after{
  content: "—";
  position: absolute;
  right: calc(var(--space-lg) * -0.5);
  color: rgba(251,187,4,0.3);
}
@keyframes marqueeScroll{
  from{ transform: translateX(0); }
  to{ transform: translateX(-50%); }
}
@media (prefers-reduced-motion: reduce){
  .marquee-track{ animation: none; }
}