/* ════════════════════════════════════════════════════════════════════
   ISV BOCHUM — GEMEINSAME STYLES
   ════════════════════════════════════════════════════════════════════ */

:root{
  --ink:#0b1420;
  --ink-2:#1a2838;
  --paper:#fbfaf6;
  --paper-2:#f4f1ea;
  --accent:#2d5573;
  --accent-dk:#1f4360;
  --accent-lt:#3d6b8a;
  --muted:#6b7684;
  --line:rgba(11,20,32,.1);
  --sans:'Space Grotesk', system-ui, sans-serif;
  --body:'Inter', system-ui, sans-serif;
  --serif:'Instrument Serif', Georgia, serif;
}

[data-theme="dark"]{
  --ink:#e8edf3;
  --ink-2:#bfcbda;
  --paper:#0d1117;
  --paper-2:#151c26;
  --accent:#5b93bb;
  --accent-dk:#4a7fa8;
  --accent-lt:#6fa8cc;
  --muted:#7a8a9a;
  --line:rgba(232,237,243,.1);
}

/* ── RESET & BASE ── */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--body);
  background:var(--paper);
  color:var(--ink);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:0;background:0}

/* ── NAVIGATION ── */
nav.top{
  position:fixed;top:0;left:0;right:0;z-index:100;
  padding:20px 40px;
  display:flex;align-items:center;gap:30px;
  backdrop-filter:blur(12px);
  background:rgba(251,250,246,.75);
  border-bottom:1px solid transparent;
  transition:background .3s, border-color .3s, padding .3s;
}
nav.top.scrolled{
  padding:14px 40px;
  border-bottom-color:var(--line);
  background:rgba(251,250,246,.92);
}
nav.top .brand{display:flex;align-items:center;gap:12px}
nav.top .brand img{height:42px;width:auto;transition:height .3s}
nav.top.scrolled .brand img{height:36px}
nav.top .brand .name{
  font-family:var(--sans);font-weight:700;font-size:18px;
  letter-spacing:-.01em;color:var(--accent);line-height:1
}
nav.top .brand .name small{
  display:block;font-weight:400;font-size:11px;color:var(--muted);
  letter-spacing:.02em;margin-top:2px
}
nav.top .links{display:flex;gap:4px;margin-left:auto}
nav.top .links a{
  font-family:var(--sans);font-size:14px;font-weight:500;
  padding:8px 14px;border-radius:999px;color:var(--ink);
  transition:background .2s;
}
nav.top .links a:hover{background:rgba(45,85,115,.08)}
nav.top .cta{
  font-family:var(--sans);font-weight:600;font-size:14px;
  padding:10px 18px;border-radius:999px;background:var(--accent);color:#fff;
  transition:background .2s, transform .2s;
}
nav.top .cta:hover{background:var(--accent-dk);transform:translateY(-1px)}

.theme-toggle{
  display:flex;align-items:center;justify-content:center;
  width:36px;height:36px;border-radius:50%;
  border:1px solid var(--line);background:transparent;
  cursor:pointer;color:var(--ink);font-size:16px;
  transition:background .2s,transform .2s;flex-shrink:0;
}
.theme-toggle:hover{background:rgba(45,85,115,.08);transform:rotate(15deg)}

[data-theme="dark"] nav.top{background:rgba(13,17,23,.82)!important}
[data-theme="dark"] nav.top.scrolled{background:rgba(13,17,23,.95)!important}

/* ── MAIN LAYOUT ── */
section{padding:120px 40px;position:relative}
.container{max-width:1200px;margin:0 auto}

/* ── SECTION HEADERS ── */
.section-head{margin-bottom:60px;max-width:700px}
.section-head .kicker{
  display:inline-block;font-family:var(--sans);font-size:12px;font-weight:600;
  color:var(--accent);letter-spacing:.14em;text-transform:uppercase;margin-bottom:16px;
}
.section-head h2{
  font-family:var(--sans);font-size:clamp(36px, 5vw, 64px);
  font-weight:700;line-height:1.02;letter-spacing:-.03em;margin-bottom:20px;
}
.section-head h2 em{
  font-family:var(--serif);font-style:italic;font-weight:400;color:var(--accent)
}
.section-head p{
  font-size:18px;line-height:1.6;color:var(--muted);max-width:560px
}

/* ── BUTTONS ── */
.btn{
  font-family:var(--sans);font-weight:600;font-size:15px;
  padding:14px 24px;border-radius:999px;
  display:inline-flex;align-items:center;gap:10px;
  transition:all .25s cubic-bezier(.2,.8,.2,1);
}
.btn.primary{background:var(--accent);color:#fff}
.btn.primary:hover{
  background:var(--accent-dk);transform:translateY(-2px);
  box-shadow:0 10px 24px -10px rgba(45,85,115,.5)
}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid rgba(11,20,32,.15)}
.btn.ghost:hover{background:var(--ink);color:#fff;border-color:var(--ink)}
.btn .arrow{transition:transform .25s}
.btn:hover .arrow{transform:translateX(4px)}

/* ── FOOTER ── */
footer{
  padding:60px 40px 30px;background:var(--paper);border-top:1px solid var(--line);
}
footer .row{
  max-width:1200px;margin:0 auto;
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:20px;
  padding-bottom:30px;border-bottom:1px solid var(--line);
}
footer .brand{display:flex;align-items:center;gap:12px}
footer .brand img{height:40px}
footer .brand b{font-family:var(--sans);font-weight:700;color:var(--accent)}
footer .links{display:flex;gap:24px;font-family:var(--sans);font-size:14px;color:var(--muted)}
footer .links a:hover{color:var(--accent)}
footer .copy{
  max-width:1200px;margin:20px auto 0;
  display:flex;justify-content:space-between;
  font-family:var(--sans);font-size:12px;color:var(--muted);
}
footer .footer-link{
  background:none;border:none;cursor:pointer;
  font-family:inherit;font-size:inherit;color:inherit;
  text-decoration:underline;text-underline-offset:3px;
  padding:0;
}
footer .footer-link:hover{opacity:.7}
[data-theme="dark"] footer{background:var(--paper)}

/* ── DARK MODE ADJUSTMENTS ── */
[data-theme="dark"] body{background:var(--paper);color:var(--ink)}

/* ── notice banner ── */
.notice-banner{
  display:flex;align-items:center;justify-content:center;gap:16px;
  padding:14px 20px;background:var(--accent);color:#fff;
  font-family:var(--sans);font-size:14px;font-weight:500;
  transition:max-height .3s ease, opacity .3s ease;
  max-height:60px;opacity:1;
}
.notice-banner.hidden{max-height:0;opacity:0;overflow:hidden}
.notice-close{
  background:none;border:none;color:#fff;font-size:18px;
  cursor:pointer;padding:4px 8px;opacity:.8;transition:opacity .2s;
  flex-shrink:0;
}
.notice-close:hover{opacity:1}

/* ── RESPONSIVE ── */
@media (max-width:900px){
  nav.top{padding:16px 20px}
  nav.top .links{display:none}
  section{padding:80px 20px}
  footer .row{flex-direction:column;align-items:flex-start}
  footer .copy{flex-direction:column;gap:8px}
}

@media (max-width:600px){
  nav.top{padding:14px 16px;gap:12px}
  nav.top .brand .name{font-size:16px}
  nav.top .cta{font-size:13px;padding:8px 14px}
  .theme-toggle{width:32px;height:32px;font-size:14px}
  section{padding:60px 16px}
  footer{padding:40px 16px 20px}
}