/* KN_DESIGN_V1 – Kunststoffnachweis · gemeinsame Tokens und Bausteine
   Einbinden: <link rel="stylesheet" href="/fonts/plex/plex.css"><link rel="stylesheet" href="/assets/kn.css">
   Regeln: Auf hellem Grund ist der Akzent immer --kn-base. Kupfer (--kn-copper-light) nur auf dunklem Grund.
   Rot (--kn-danger) nur für Fristen, Warnungen, „fehlt noch“, Grenzwert überschritten. Status nie nur über Farbe. */

/* ---------- Tokens: hell ---------- */
:root{
  --kn-base:#2A4655;
  --kn-base-hover:#1B2F39;
  --kn-copper-light:#F2B48F;
  --kn-copper:#C2693A;
  --kn-danger:#B42318;
  --kn-danger-soft:#F0C4BE;
  --kn-ink:#15232D;
  --kn-text-2:#3D4A53;
  --kn-muted:#55626B;
  --kn-paper:#F5F3EE;
  --kn-surface:#FFFFFF;
  --kn-sand:#EAE6DC;
  --kn-border:#DAD6CC;
  --kn-divider:#E7E3DA;
  --kn-input-border:#8C969D;

  /* Rollen (werden im Dunkelmodus umgestellt) */
  --kn-accent:var(--kn-base);          /* Kennzeichnungen, Schrittnummern, Links, Häkchen */
  --kn-accent-hover:var(--kn-base-hover);
  --kn-btn-bg:var(--kn-base);
  --kn-btn-fg:#FFFFFF;
  --kn-btn-bg-hover:var(--kn-base-hover);
  --kn-focus:var(--kn-base);
  --kn-shadow-doc:0 18px 40px rgba(21,35,45,.18),0 2px 6px rgba(21,35,45,.08);

  --kn-font:'IBM Plex Sans',system-ui,-apple-system,'Segoe UI',Roboto,Arial,sans-serif;
  --kn-mono:'IBM Plex Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --kn-radius:8px;
  --kn-radius-card:12px;
  --kn-tap:44px;
  color-scheme:light;
}

/* ---------- Tokens: Dunkelmodus der App (abgeleitet aus der --kn-base-Familie) ---------- */
[data-theme="dark"]{
  --kn-paper:#0F1A20;
  --kn-surface:#16252D;
  --kn-sand:#1E3039;
  --kn-border:#2C414C;
  --kn-divider:#23353F;
  --kn-ink:#EEF2F4;
  --kn-text-2:#C5CFD5;
  --kn-muted:#9AA8B0;
  --kn-input-border:#6B7C86;
  --kn-danger:#F28B82;
  --kn-danger-soft:#5C2A26;
  --kn-accent:var(--kn-copper-light);
  --kn-accent-hover:#F7CBB0;
  --kn-btn-bg:#FFFFFF;
  --kn-btn-fg:#15232D;
  --kn-btn-bg-hover:#E7ECEF;
  --kn-focus:var(--kn-copper-light);
  --kn-shadow-doc:0 18px 40px rgba(0,0,0,.45);
  color-scheme:dark;
}

/* ---------- Grundlagen ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{margin:0;font-family:var(--kn-font);font-size:16px;line-height:1.6;color:var(--kn-ink);background:var(--kn-paper);}
img,svg{max-width:100%;}
h1,h2,h3,h4{font-family:var(--kn-font);color:var(--kn-ink);line-height:1.2;margin:0 0 .5em;}
h1{font-size:clamp(30px,5vw,48px);font-weight:700;letter-spacing:-.01em;}
h2{font-size:clamp(24px,3.4vw,34px);font-weight:700;}
h3{font-size:20px;font-weight:600;}
p{margin:0 0 1em;}
a{color:var(--kn-accent);text-underline-offset:3px;}
a:hover{color:var(--kn-accent-hover);}
:focus-visible{outline:3px solid var(--kn-focus);outline-offset:2px;border-radius:4px;}
.kn-wrap{max-width:1160px;margin:0 auto;padding:0 20px;}
.kn-lead{font-size:18px;color:var(--kn-text-2);}
.kn-muted{color:var(--kn-muted);}
.kn-mono{font-family:var(--kn-mono);}
.kn-sr{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;}

/* Kennzeichnung (Eyebrow), Normen, Einheiten */
.kn-eyebrow{font-family:var(--kn-mono);font-size:13px;font-weight:500;letter-spacing:.06em;text-transform:uppercase;color:var(--kn-accent);margin:0 0 10px;}
.kn-eyebrow--sm{font-size:12px;}

/* ---------- Logo ---------- */
.kn-logo{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--kn-ink);font-weight:600;font-size:19px;letter-spacing:-.01em;min-height:var(--kn-tap);}
.kn-logo svg{width:34px;height:34px;flex:none;}

/* ---------- Knöpfe ---------- */
.kn-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:var(--kn-tap);padding:10px 20px;border-radius:var(--kn-radius);border:1.5px solid var(--kn-btn-bg);background:var(--kn-btn-bg);color:var(--kn-btn-fg);font:700 16px/1.2 var(--kn-font);text-decoration:none;cursor:pointer;transition:background .15s,border-color .15s;}
.kn-btn:hover{background:var(--kn-btn-bg-hover);border-color:var(--kn-btn-bg-hover);color:var(--kn-btn-fg);}
.kn-btn--secondary{background:transparent;color:var(--kn-ink);border-color:var(--kn-ink);}
.kn-btn--secondary:hover{background:var(--kn-sand);color:var(--kn-ink);border-color:var(--kn-ink);}
.kn-btn:disabled,.kn-btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed;}
.kn-btn--block{display:flex;width:100%;}
.kn-link-btn{background:none;border:0;padding:0;min-height:var(--kn-tap);color:var(--kn-accent);font-family:var(--kn-font);font-weight:600;font-size:inherit;line-height:1.2;text-decoration:underline;text-underline-offset:3px;cursor:pointer;}

/* ---------- Flächen ---------- */
.kn-card{background:var(--kn-surface);border:1px solid var(--kn-border);border-radius:var(--kn-radius-card);padding:26px;}
.kn-card + .kn-card{margin-top:16px;}
.kn-card__divider{border:0;border-top:1px solid var(--kn-divider);margin:18px 0;}
.kn-band{background:var(--kn-sand);border-radius:var(--kn-radius-card);padding:24px 26px;}
.kn-section{padding:64px 0;}
@media(max-width:640px){.kn-card{padding:22px;}.kn-section{padding:44px 0;}}

/* Dunkle Fläche (Kopfbereich, Schlussbereich, App-Leiste) – immer --kn-base, in beiden Modi */
.kn-dark{background:var(--kn-base);color:#FFFFFF;
  --kn-ink:#FFFFFF;--kn-text-2:#DCE4E8;--kn-muted:#C3CED4;--kn-accent:var(--kn-copper-light);--kn-accent-hover:#F7CBB0;
  --kn-btn-bg:#FFFFFF;--kn-btn-fg:#15232D;--kn-btn-bg-hover:#E7ECEF;--kn-focus:var(--kn-copper-light);--kn-sand:rgba(255,255,255,.08);}
.kn-dark .kn-btn--secondary{color:#FFFFFF;border-color:#FFFFFF;background:transparent;}
.kn-dark .kn-btn--secondary:hover{background:rgba(255,255,255,.1);}
[data-theme="dark"] .kn-dark{background:#1B2F39;}

/* App-Leiste */
.kn-appbar{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:16px;flex-wrap:wrap;padding:6px 20px;}
.kn-appbar nav{display:flex;gap:4px;flex-wrap:wrap;}
.kn-appbar nav a{display:inline-flex;align-items:center;min-height:var(--kn-tap);padding:0 12px;border-radius:var(--kn-radius);color:#FFFFFF;text-decoration:none;font-weight:500;}
.kn-appbar nav a:hover{background:rgba(255,255,255,.1);color:#FFFFFF;}
.kn-appbar nav a[aria-current="page"]{box-shadow:inset 0 -3px 0 var(--kn-copper-light);}

/* Schrittnummer */
.kn-step{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;border:1.5px solid var(--kn-accent);color:var(--kn-accent);font:500 15px/1 var(--kn-mono);flex:none;}
.kn-step--done{background:var(--kn-accent);color:var(--kn-surface);}

/* ---------- Status (immer mit Text) ---------- */
.kn-status{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;line-height:1.3;}
.kn-status::before{font-family:var(--kn-font);font-weight:700;}
.kn-status--done{color:var(--kn-accent);}
.kn-status--done::before{content:"✓";}
.kn-status--missing{color:var(--kn-danger);}
.kn-status--missing::before{content:"!";display:inline-flex;align-items:center;justify-content:center;width:18px;height:18px;border:1.5px solid currentColor;border-radius:50%;font-size:12px;}
.kn-status--open{color:var(--kn-muted);}
.kn-status--open::before{content:"○";}

/* Warnhinweis (Fristen, Grenzwerte) */
.kn-alert{border:1px solid var(--kn-danger-soft);border-left:4px solid var(--kn-danger);background:var(--kn-surface);border-radius:var(--kn-radius);padding:14px 18px;color:var(--kn-ink);}
.kn-alert__title{color:var(--kn-danger);font-weight:700;margin:0 0 4px;}

/* Norm-Chip */
.kn-chip{display:inline-flex;align-items:center;min-height:28px;padding:2px 10px;border:1px solid var(--kn-border);border-radius:999px;font:500 12px/1.3 var(--kn-mono);letter-spacing:.02em;color:var(--kn-text-2);background:var(--kn-surface);white-space:nowrap;}
.kn-chips{display:flex;flex-wrap:wrap;gap:6px;}

/* ---------- Formular ---------- */
.kn-field{display:grid;gap:6px;margin-bottom:18px;}
.kn-field label,.kn-label{font-weight:600;font-size:15px;color:var(--kn-ink);}
.kn-input,.kn-select,.kn-textarea{width:100%;min-height:var(--kn-tap);padding:10px 12px;border:1px solid var(--kn-input-border);border-radius:var(--kn-radius);background:var(--kn-surface);color:var(--kn-ink);font:400 16px/1.4 var(--kn-font);}
.kn-textarea{min-height:110px;resize:vertical;}
.kn-input::placeholder,.kn-textarea::placeholder{color:var(--kn-muted);opacity:1;}
.kn-input:focus-visible,.kn-select:focus-visible,.kn-textarea:focus-visible{outline:3px solid var(--kn-focus);outline-offset:1px;border-color:var(--kn-focus);}
.kn-input.kn-mono{font-family:var(--kn-mono);}
.kn-help{font-size:14px;color:var(--kn-muted);}
.kn-error{font-size:14px;color:var(--kn-danger);font-weight:600;}
.kn-input[aria-invalid="true"],.kn-select[aria-invalid="true"]{border-color:var(--kn-danger);border-width:2px;}
.kn-check{display:flex;gap:12px;align-items:flex-start;min-height:var(--kn-tap);padding:10px 14px;border:1px solid var(--kn-border);border-radius:var(--kn-radius);background:var(--kn-surface);cursor:pointer;}
.kn-check input{width:20px;height:20px;margin:2px 0 0;flex:none;accent-color:var(--kn-base);}
[data-theme="dark"] .kn-check input{accent-color:var(--kn-copper-light);}

/* ---------- Musterdokument (Chargenpass-Vorschau) ---------- */
.kn-doc{background:#FFFFFF;color:#15232D;border:1px solid #DAD6CC;border-radius:var(--kn-radius-card);padding:24px 26px;box-shadow:var(--kn-shadow-doc);max-width:460px;
  --kn-ink:#15232D;--kn-text-2:#3D4A53;--kn-muted:#55626B;--kn-danger:#B42318;--kn-border:#DAD6CC;--kn-surface:#FFFFFF;--kn-accent:#2A4655;}
.kn-doc--flat{box-shadow:none;}
.kn-doc__head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;padding-bottom:12px;margin-bottom:6px;border-bottom:1.5px solid #15232D;}
.kn-doc__title{font-size:18px;font-weight:700;margin:0;}
.kn-doc__tag{font:500 12px/1.3 var(--kn-mono);letter-spacing:.06em;text-transform:uppercase;color:#55626B;}
.kn-doc__row{display:flex;justify-content:space-between;gap:16px;padding:9px 0;border-bottom:1px solid #E7E3DA;font-size:14px;}
.kn-doc__row:last-of-type{border-bottom:0;}
.kn-doc__label{color:#3D4A53;}
.kn-doc__value{font-family:var(--kn-mono);font-weight:500;text-align:right;color:#15232D;}
.kn-doc__missing{font-family:var(--kn-font);font-weight:600;color:#B42318;}
.kn-doc__foot{margin-top:14px;padding-top:12px;border-top:1px solid #E7E3DA;}

/* ---------- Raster ---------- */
.kn-grid{display:grid;gap:20px;}
.kn-grid--2{grid-template-columns:repeat(auto-fit,minmax(min(100%,320px),1fr));}
.kn-grid--3{grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));}

@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto!important;}}
@media print{.kn-appbar,.kn-btn{display:none!important;}body{background:#fff;}}

/* ---------- Website-Rahmen (KN_DESIGN_V1, Phase 3) ---------- */
.kn-skip{position:absolute;left:-9999px;top:8px;z-index:100;background:#fff;color:#15232D;padding:10px 14px;border-radius:8px;font-weight:700;}
.kn-skip:focus{left:12px;}
.kn-site-header{position:sticky;top:0;z-index:40;}
.kn-site-header__in{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:68px;}
.kn-site-header .kn-logo{color:#fff;}
.kn-nav{display:flex;align-items:center;gap:4px;}
.kn-nav a{display:inline-flex;align-items:center;min-height:var(--kn-tap);padding:0 12px;border-radius:var(--kn-radius);color:#fff;text-decoration:none;font-weight:500;font-size:15px;}
.kn-nav a:hover{background:rgba(255,255,255,.1);color:#fff;}
.kn-nav a[aria-current="page"]{box-shadow:inset 0 -3px 0 var(--kn-copper-light);}
.kn-nav .kn-btn{margin-left:8px;font-size:15px;padding:8px 16px;}
.kn-nav .kn-btn:hover{color:#15232D;}
.kn-menu-btn{display:none;min-height:var(--kn-tap);min-width:var(--kn-tap);padding:0 12px;border:1.5px solid rgba(255,255,255,.6);border-radius:var(--kn-radius);background:transparent;color:#fff;font:600 15px/1 var(--kn-font);cursor:pointer;}
@media(max-width:900px){
  .kn-menu-btn{display:inline-flex;align-items:center;gap:8px;}
  .kn-nav{display:none;position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;gap:2px;padding:10px 20px 18px;background:var(--kn-base);border-top:1px solid rgba(255,255,255,.15);}
  .kn-nav.is-open{display:flex;}
  .kn-nav .kn-btn{margin:8px 0 0;}
}
[data-theme="dark"] .kn-site-header .kn-nav{background:inherit;}
.kn-hero{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;padding:56px 0 72px;}
.kn-hero h1{margin-bottom:16px;}
.kn-hero__meta{font-size:14px;color:var(--kn-muted);margin-top:16px;}
.kn-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px;}
@media(max-width:900px){.kn-hero{grid-template-columns:1fr;gap:32px;padding:36px 0 52px;}.kn-hero .kn-doc{max-width:none;}}
.kn-section-head{max-width:720px;margin-bottom:32px;}
.kn-list{list-style:none;margin:0;padding:0;display:grid;gap:10px;}
.kn-list li{position:relative;padding-left:26px;}
.kn-list li::before{content:"✓";position:absolute;left:0;top:0;color:var(--kn-accent);font-weight:700;}
.kn-result{margin-top:18px;padding-top:14px;border-top:1px solid var(--kn-divider);font-size:15px;}
.kn-result b{color:var(--kn-accent);}
.kn-steps{counter-reset:none;display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));list-style:none;margin:0;padding:0;}
.kn-steps li{display:flex;gap:14px;align-items:flex-start;}
.kn-steps h3{margin:4px 0 4px;font-size:18px;}
.kn-video{margin-top:36px;max-width:880px;}
.kn-video video{display:block;width:100%;height:auto;aspect-ratio:16/9;background:#15232D;border-radius:var(--kn-radius-card);}
.kn-video p{font-size:13px;color:var(--kn-muted);margin:8px 0 0;}
.kn-price{display:flex;flex-direction:column;}
.kn-price__amount{font-size:40px;font-weight:700;line-height:1;margin:8px 0 4px;}
.kn-price__amount small{font-size:15px;font-weight:400;color:var(--kn-muted);}
.kn-price .kn-list{margin:18px 0 24px;flex:1;}
.kn-trust{display:flex;flex-wrap:wrap;gap:8px;}
.kn-trust span{display:inline-flex;align-items:center;min-height:36px;padding:4px 14px;border:1px solid var(--kn-border);border-radius:999px;background:var(--kn-surface);font-size:14px;font-weight:500;color:var(--kn-text-2);}
.kn-placeholder{border:1.5px dashed var(--kn-input-border);background:var(--kn-sand);border-radius:var(--kn-radius);padding:12px 14px;font-size:14px;color:var(--kn-text-2);}
.kn-photo{aspect-ratio:1;max-width:220px;border-radius:var(--kn-radius-card);background:var(--kn-sand);border:1.5px dashed var(--kn-input-border);display:flex;align-items:center;justify-content:center;font-size:13px;color:var(--kn-muted);text-align:center;padding:12px;}
.kn-faq details{border-bottom:1px solid var(--kn-divider);}
.kn-faq summary{cursor:pointer;min-height:var(--kn-tap);display:flex;align-items:center;font-weight:600;padding:10px 0;}
.kn-faq details p{color:var(--kn-text-2);}
.kn-site-footer{padding:28px 0;border-top:1px solid var(--kn-divider);font-size:14px;color:var(--kn-muted);}
.kn-site-footer__in{display:flex;flex-wrap:wrap;gap:12px 24px;justify-content:space-between;align-items:center;}
.kn-site-footer nav{display:flex;flex-wrap:wrap;gap:4px 16px;}
.kn-site-footer a{color:var(--kn-text-2);display:inline-flex;align-items:center;min-height:var(--kn-tap);}
.kn-form-status{font-size:15px;font-weight:600;min-height:1.4em;margin-top:10px;}
.kn-form-status.is-ok{color:var(--kn-accent);}
.kn-form-status.is-err{color:var(--kn-danger);}
.kn-person{display:grid;grid-template-columns:200px 1fr;gap:28px;align-items:center;}
@media(max-width:640px){.kn-person{grid-template-columns:1fr;}.kn-person .kn-photo{max-width:140px;}}

/* ---------- Textseiten (Rechtsseiten, Ratgeber) ---------- */
.kn-prose{max-width:820px;margin:0 auto;padding:40px 20px 64px;}
.kn-prose h1{font-size:clamp(28px,4vw,40px);}
.kn-prose h2{font-size:clamp(21px,2.6vw,26px);margin-top:1.6em;}
.kn-prose h3{font-size:18px;margin-top:1.3em;}
.kn-prose p,.kn-prose li{color:var(--kn-text-2);}
.kn-prose strong{color:var(--kn-ink);}
.kn-prose ul,.kn-prose ol{padding-left:1.3em;margin:0 0 1em;}
.kn-prose li{margin-bottom:.35em;}
.kn-prose table{border-collapse:collapse;width:100%;margin:0 0 1.2em;font-size:15px;display:block;overflow-x:auto;}
.kn-prose th,.kn-prose td{text-align:left;vertical-align:top;padding:10px 12px;border-bottom:1px solid var(--kn-divider);}
.kn-prose th{font-weight:600;color:var(--kn-ink);background:var(--kn-sand);}
.kn-prose .lead,.kn-prose .intro{font-size:18px;color:var(--kn-text-2);}
.kn-prose .crumbs,.kn-prose .meta,.kn-prose .stand,.kn-prose .src{font-size:14px;color:var(--kn-muted);margin-bottom:12px;}
.kn-prose .crumbs a{display:inline-flex;align-items:center;min-height:var(--kn-tap);}
.kn-prose .box{background:var(--kn-surface);border:1px solid var(--kn-border);border-left:4px solid var(--kn-base);border-radius:var(--kn-radius);padding:16px 18px;margin:0 0 1.2em;color:var(--kn-text-2);}
.kn-prose .box strong{display:block;margin-bottom:4px;}
.kn-prose .box.warn{border-left-color:var(--kn-danger);}
.kn-prose .box.warn strong{color:var(--kn-danger);}
.kn-prose .card,.kn-prose .section{background:var(--kn-surface);border:1px solid var(--kn-border);border-radius:var(--kn-radius-card);padding:22px 24px;margin:0 0 16px;}
.kn-prose .label{font-family:var(--kn-mono);font-size:13px;font-weight:500;letter-spacing:.06em;text-transform:uppercase;color:var(--kn-accent);margin-bottom:6px;}
.kn-prose .content p:last-child{margin-bottom:0;}
.kn-prose .grid,.kn-prose .cards{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));margin-bottom:1.2em;}
.kn-prose .cards .card{margin:0;text-decoration:none;color:inherit;display:block;}
.kn-prose .k{font-family:var(--kn-mono);font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--kn-accent);}
.kn-prose .toc{background:var(--kn-sand);border-radius:var(--kn-radius);padding:14px 18px 6px;margin-bottom:1.4em;}
.kn-prose .note{font-size:14px;color:var(--kn-muted);}
.kn-prose .cta{background:var(--kn-base);color:#fff;border-radius:var(--kn-radius-card);padding:24px;margin-top:2em;
  --kn-ink:#FFFFFF;--kn-text-2:#DCE4E8;--kn-accent:var(--kn-copper-light);--kn-btn-bg:#FFFFFF;--kn-btn-fg:#15232D;--kn-btn-bg-hover:#E7ECEF;--kn-focus:var(--kn-copper-light);}
.kn-prose .cta a{color:var(--kn-copper-light);font-weight:600;}
.kn-prose .back{display:inline-flex;align-items:center;min-height:var(--kn-tap);margin-top:1em;}
.kn-prose .ctas{display:flex;flex-wrap:wrap;gap:12px;margin-top:20px;}
.kn-prose .btn{display:inline-flex;align-items:center;justify-content:center;min-height:var(--kn-tap);padding:10px 20px;border-radius:var(--kn-radius);border:1.5px solid var(--kn-base);background:var(--kn-base);color:#fff;font-weight:700;text-decoration:none;}
.kn-prose .btn-outline{background:transparent;color:var(--kn-ink);border-color:var(--kn-ink);}
.kn-prose .check-circle{width:48px;height:48px;}
.kn-prose .check-circle path{stroke:var(--kn-base);}
.kn-prose details{border-bottom:1px solid var(--kn-divider);}
.kn-prose summary{cursor:pointer;min-height:var(--kn-tap);display:flex;align-items:center;font-weight:600;color:var(--kn-ink);padding:8px 0;}
.kn-prose .cta a{display:inline-flex;align-items:center;min-height:var(--kn-tap);margin-right:18px;}
.kn-prose .cards .card h2{font-size:19px;margin-top:6px;}