/* ==========================================================================
   compressedair.network - zentrales Stylesheet
   Eine Datei fuer die ganze Seite. Jede Seite nutzt includes/header.php und
   includes/footer.php (gemeinsamer Kopf/Fuss) und bindet NUR diese Datei ein,
   kein Style pro Seite. Quelle der echten Funktionen/Inhalte: X5-can/ (alte
   WebsiteX5-Seite, Referenz) plus die von Roland vorab bereinigten Extrakte
   in Code-ohne-X5/ (siehe Code-ohne-X5/BRIEFING-fuer-Roland.md).
   ========================================================================== */

:root{
  --navy-900:#0f2942;
  --blue-600:#1d6fd8;
  --blue-500:#2f7fe0;
  --blue-100:#eaf2fc;
  --ink-700:#33475b;
  --muted-600:#5f6b7a;
  --border:#e3e9f2;
  --bg-page:#eef2f7;
  --white:#ffffff;
  --mono: 'Courier New', ui-monospace, SFMono-Regular, monospace;
  --sans: 'Inter', Arial, Helvetica, sans-serif;
}

*, *::before, *::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--sans);
  color:var(--ink-700);
  background:var(--white);
  -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; }
a{ color:inherit; }

.skip-link{
  position:absolute; left:-999px; top:0; z-index:1000;
  background:var(--navy-900); color:var(--white);
  padding:10px 16px; border-radius:0 0 8px 0;
}
.skip-link:focus{ left:0; }

/* Header */
.site-header{
  position:sticky; top:0; z-index:100;
  background:var(--white);
  border-bottom:1px solid var(--border);
  transition:box-shadow .2s ease;
}
.site-header.scrolled{ box-shadow:0 4px 16px rgba(15,41,66,.08); }
.header-inner{
  max-width:1240px; margin:0 auto;
  display:flex; align-items:center; gap:32px;
  padding:14px 24px;
}
.site-header .brand{ display:flex; align-items:center; gap:10px; text-decoration:none; flex-shrink:0; }
.site-header .brand img{ height:34px; width:auto; }
.brand-text{ display:flex; flex-direction:column; line-height:1.1; }
.brand-text .name{ font-weight:800; color:var(--navy-900); font-size:15px; }
.brand-text .sub{ font-family:var(--mono); font-size:10px; letter-spacing:.1em; color:var(--blue-600); }
.main-nav{ display:flex; gap:22px; margin-left:auto; }
.main-nav a{ text-decoration:none; font-size:14.5px; color:var(--ink-700); font-weight:600; }
.main-nav a:hover{ color:var(--blue-600); }
.header-actions{ display:flex; align-items:center; gap:10px; }
.btn{
  display:inline-block; font-size:14px; font-weight:700;
  padding:10px 18px; border-radius:8px; text-decoration:none;
  border:2px solid var(--blue-600);
}
.btn-primary{ background:var(--blue-600); color:var(--white); }
.btn-primary:hover{ background:var(--navy-900); border-color:var(--navy-900); }
.btn-text{ border-color:transparent; color:var(--blue-600); padding:10px 8px; }
.btn-text:hover{ text-decoration:underline; }

@media (max-width:960px){
  .main-nav{ display:none; }
}

/* Footer */
.site-footer{ background:var(--navy-900); color:#c8d6e5; padding:56px 24px 24px; margin-top:80px; }
.footer-grid{
  max-width:1240px; margin:0 auto;
  display:grid; grid-template-columns:1.6fr repeat(3,1fr); gap:32px;
  padding-bottom:32px; border-bottom:1px solid rgba(255,255,255,.12);
}
.site-footer .brand{ text-decoration:none; display:flex; align-items:center; gap:10px; margin-bottom:12px; }
.site-footer .brand-text .name{ color:var(--white); }
.site-footer .desc{ font-size:13.5px; line-height:1.6; color:#9fb2c6; max-width:320px; }
.site-footer h4{ font-family:var(--mono); font-size:12px; letter-spacing:.08em; color:#7d93aa; margin:0 0 14px; }
.site-footer ul{ list-style:none; padding:0; margin:0; display:grid; gap:10px; }
.site-footer ul a{ text-decoration:none; font-size:14px; color:#c8d6e5; }
.site-footer ul a:hover{ color:var(--white); }
.footer-bottom{
  max-width:1240px; margin:0 auto; padding-top:20px;
  display:flex; flex-wrap:wrap; gap:10px 24px; justify-content:space-between;
  font-size:12.5px; color:#7d93aa;
}
.footer-bottom a{ color:#7d93aa; text-decoration:none; }
.footer-bottom a:hover{ color:var(--white); }

@media (max-width:800px){
  .footer-grid{ grid-template-columns:1fr 1fr; }
}
@media (max-width:520px){
  .footer-grid{ grid-template-columns:1fr; }
}

/* Scroll-Reveal (von footer.php per IntersectionObserver gesteuert) */
.reveal{ opacity:0; transform:translateY(16px); transition:opacity .5s ease, transform .5s ease; }
.reveal.in{ opacity:1; transform:none; }

/* ==========================================================================
   can-topic-articles Widget (von assets/topic-loader.js befuellt, gleiches
   Markup/Klassen auf jeder Seite die das Widget nutzt)
   ========================================================================== */
.can-topic-articles{ width:100%; display:block; }
.can-topic-articles .ctl-head{
  margin:0 0 16px; font-size:clamp(24px,2vw,32px); line-height:1.15;
  color:var(--navy-900); font-weight:800;
}
.can-topic-articles .ctl-grid{
  display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:22px;
}
.can-topic-articles .ctl-card{
  display:block; background:var(--white); border:1px solid var(--border);
  border-radius:20px; overflow:hidden; box-shadow:0 6px 20px rgba(15,41,66,.06);
  text-decoration:none; color:var(--ink-700);
  transition:transform .2s ease, box-shadow .2s ease;
}
.can-topic-articles .ctl-card:hover{ transform:translateY(-4px); box-shadow:0 10px 26px rgba(15,41,66,.10); }
.can-topic-articles .ctl-image{ width:100%; aspect-ratio:16/9.5; background:var(--blue-100) center/cover no-repeat; }
.can-topic-articles .ctl-body{ padding:16px; }
.can-topic-articles .ctl-meta{
  display:flex; flex-wrap:wrap; gap:8px 10px; font-size:13px; color:var(--muted-600); margin-bottom:12px;
}
.can-topic-articles .ctl-badge{
  display:inline-flex; align-items:center; padding:6px 10px; border-radius:999px;
  background:var(--blue-100); color:var(--navy-900); font-size:12px; font-weight:700;
}
.can-topic-articles .ctl-title{
  margin:0 0 10px; font-size:clamp(18px,1.6vw,22px); line-height:1.25; color:var(--navy-900);
  display:-webkit-box; -webkit-line-clamp:3; -webkit-box-orient:vertical; overflow:hidden;
}
.can-topic-articles .ctl-text{
  margin:0; color:var(--muted-600); font-size:14px; line-height:1.6;
  display:-webkit-box; -webkit-line-clamp:4; -webkit-box-orient:vertical; overflow:hidden;
}
.can-topic-articles .ctl-empty{
  padding:18px 20px; background:var(--white); border:1px solid var(--border);
  border-radius:16px; color:var(--muted-600);
}
@media (max-width:1000px){ .can-topic-articles .ctl-grid{ grid-template-columns:repeat(2,minmax(0,1fr)); } }
@media (max-width:640px){ .can-topic-articles .ctl-grid{ grid-template-columns:1fr; } }

/* ==========================================================================
   Startseite (.can4u-home)
   ========================================================================== */
.can4u-home{
  background:
    linear-gradient(var(--bg-page) 1px, transparent 1px) 0 0/32px 32px,
    linear-gradient(90deg, var(--bg-page) 1px, transparent 1px) 0 0/32px 32px,
    #f6f8fb;
  padding:56px 24px 72px;
}

.ch-eyebrow{
  font-family:var(--mono); font-size:12px; letter-spacing:.08em; text-transform:uppercase;
  color:var(--blue-600); margin:0 0 14px;
}
.ch-section-title{ font-size:clamp(24px,2.6vw,32px); color:var(--navy-900); margin:0 0 10px; line-height:1.2; font-weight:800; }
.ch-section-intro{ color:var(--muted-600); font-size:15px; max-width:760px; margin:0 0 28px; line-height:1.6; }

/* Hero */
.ch-hero{ max-width:1180px; margin:0 auto 72px; }
.ch-hero-grid{ display:grid; grid-template-columns:1.3fr 1fr; gap:48px; align-items:center; }
.ch-hero-title{
  font-size:clamp(30px,4vw,46px); line-height:1.15; color:var(--navy-900); margin:0 0 20px; font-weight:800;
}
.ch-hero-text{ font-size:16px; line-height:1.6; color:var(--muted-600); margin:0 0 28px; max-width:560px; }
.ch-hero-actions{ display:flex; gap:14px; flex-wrap:wrap; }
.ch-btn{
  display:inline-block; font-family:var(--mono); font-size:14px; letter-spacing:.02em;
  padding:14px 22px; border-radius:8px; text-decoration:none; border:2px solid var(--blue-600);
  transition:background .15s ease, color .15s ease, transform .15s ease;
}
.ch-btn-primary{ background:var(--blue-600); color:var(--white); }
.ch-btn-primary:hover{ background:var(--navy-900); border-color:var(--navy-900); transform:translateY(-1px); }
.ch-btn-secondary{ background:transparent; color:var(--blue-600); }
.ch-btn-secondary:hover{ background:var(--blue-100); transform:translateY(-1px); }

.ch-gauge-card{
  background:var(--white); border:1px solid var(--border); border-radius:20px; padding:28px;
  text-align:center; box-shadow:0 10px 30px rgba(15,41,66,.08);
}
.ch-gauge-svg{ width:100%; max-width:280px; height:auto; }
.ch-gauge-track{ stroke:var(--border); }
.ch-gauge-active{ stroke:var(--blue-600); }
.ch-gauge-needle line{ stroke:var(--navy-900); stroke-width:4; stroke-linecap:round; }
.ch-gauge-needle circle{ fill:var(--navy-900); }
.ch-gauge-value{ font-family:var(--mono); font-size:36px; font-weight:700; color:var(--navy-900); margin-top:8px; }
.ch-gauge-value span{ font-size:18px; font-weight:400; }
.ch-gauge-caption{ font-size:13px; color:var(--muted-600); margin:8px 0 0; }

/* Bereiche-Grid */
.ch-bereiche{ max-width:1180px; margin:0 auto 72px; }
.ch-card-grid{ display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:20px; }
.ch-card{
  position:relative; display:block; background:var(--white); border:1px solid var(--border);
  border-radius:16px; padding:22px 20px 20px; text-decoration:none; color:var(--ink-700);
  transition:transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.ch-card:hover{ transform:translateY(-3px); box-shadow:0 10px 24px rgba(15,41,66,.10); border-color:var(--blue-600); }
.ch-card-muted{ opacity:.72; }
.ch-card-icon{
  display:inline-flex; align-items:center; justify-content:center; width:40px; height:40px;
  border-radius:10px; background:var(--blue-100); color:var(--blue-600); font-size:17px; margin-bottom:14px;
}
.ch-card-num{ position:absolute; top:20px; right:18px; font-family:var(--mono); font-size:12px; color:var(--border); }
.ch-card h3{ margin:0 0 8px; font-size:17px; color:var(--navy-900); }
.ch-card p{ margin:0; font-size:13.5px; line-height:1.55; color:var(--muted-600); }

.ch-articles{ max-width:1180px; margin:0 auto 72px; }

/* Rechner-Tools */
.ch-calc{ max-width:1180px; margin:0 auto 72px; }
.ch-calc-card{
  display:grid; grid-template-columns:1.2fr 1fr; background:var(--white); border:1px solid var(--border);
  border-radius:20px; overflow:hidden; box-shadow:0 10px 30px rgba(15,41,66,.08);
}
.ch-calc-inputs{ padding:32px; }
.ch-calc-row{ margin-bottom:22px; }
.ch-calc-row:last-child{ margin-bottom:0; }
.ch-calc-label{ display:flex; align-items:baseline; gap:8px; font-size:14px; color:var(--ink-700); margin-bottom:8px; }
.ch-calc-label output{ font-family:var(--mono); font-weight:700; color:var(--navy-900); margin-left:auto; }
.ch-calc-unit{ font-family:var(--mono); font-size:12px; color:var(--muted-600); }
.ch-calc-inputs input[type="range"]{ width:100%; accent-color:var(--blue-600); }
.ch-calc-result{ background:var(--blue-100); padding:32px; display:flex; flex-direction:column; justify-content:center; }
.ch-calc-cost{ font-family:var(--mono); font-size:34px; font-weight:700; color:var(--navy-900); margin:0 0 6px; }
.ch-calc-sub{ font-size:13.5px; color:var(--ink-700); margin:0 0 16px; }
.ch-calc-footnote{ font-size:12px; color:var(--muted-600); line-height:1.5; margin:0 0 16px; }
.ch-calc-link{ font-size:13.5px; color:var(--blue-600); text-decoration:none; font-weight:700; }
.ch-calc-link:hover{ text-decoration:underline; }

/* Themen-Links */
.ch-topics{ max-width:1180px; margin:0 auto 72px; text-align:center; }
.ch-topics-label{ font-size:13px; color:var(--muted-600); margin:0 0 14px; }
.ch-topics-links{ display:flex; flex-wrap:wrap; justify-content:center; gap:10px 18px; }
.ch-topics-links a{
  font-size:13.5px; color:var(--blue-600); text-decoration:none; padding:6px 14px;
  border:1px solid var(--border); border-radius:999px; background:var(--white);
}
.ch-topics-links a:hover{ border-color:var(--blue-600); background:var(--blue-100); }

/* Wissensbereich */
.ch-knowledge{ max-width:760px; margin:0 auto; text-align:center; }
.ch-knowledge-list{ list-style:none; padding:0; margin:0; display:grid; gap:10px; }
.ch-knowledge-list li{ font-size:14.5px; color:var(--ink-700); }

@media (max-width:960px){
  .ch-hero-grid{ grid-template-columns:1fr; }
  .ch-card-grid{ grid-template-columns:repeat(2,minmax(0,1fr)); }
  .ch-calc-card{ grid-template-columns:1fr; }
}
@media (max-width:560px){
  .can4u-home{ padding:32px 16px 48px; }
  .ch-card-grid{ grid-template-columns:1fr; }
}