/* ==========================================================================
   SKT Umweltberatung — Design-System
   Gebaut nach dem Apple-Design-Skill. Werte sind bewusst gesetzt, nicht geraten:
   - Springs: echte kritisch gedaempfte Federn als linear()-Easing (Kap. 4)
   - Letter-Spacing groessenabhaengig, Zeilenhoehe gegenlaeufig (Kap. 15)
   - Glas nur im Chrome, nie Glas auf Glas, weiche Scroll-Kante (Kap. 12)
   - Nur transform + opacity animiert (Kap. 11)
   - prefers-reduced-motion / -transparency / -contrast von Anfang an (Kap. 14)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1 · Tokens
   -------------------------------------------------------------------------- */
:root {
  color-scheme: light;

  /* Farben — Hausfarben laut Briefbogen (Fragebogen G1).
     Wichtig: --accent (#6baa1f) erreicht auf Weiss nur 2.84:1 und ist damit
     fuer Text und Buttonflaechen nicht zulaessig (WCAG AA verlangt 4.5:1).
     Deshalb zwei Rollen: --accent traegt Grafik (Blatt, Linien, Flaechen),
     --accent-ink traegt alles Lesbare (4.96:1).                              */
  --page:        #ffffff;
  --bg:          #fafaf8;   /* Flaechen-Hintergrund (auch a11y-Panel)        */
  --surface:     #fafaf8;
  --surface-2:   #f2f3ee;
  --ink:         #1f1f1f;   /* Anthrazit laut Briefbogen                     */
  --ink-soft:    #5b6158;
  --ink-mute:    #85897f;
  --accent:      #6baa1f;   /* Primaergruen - nur Grafik, nie Text auf Weiss */
  --accent-brt:  #8bcf2f;   /* Hellgruen - Verlaeufe, Highlights             */
  --accent-ink:  #4a7d12;   /* Text und Buttonflaechen, 4.96:1 auf Weiss     */
  --accent-dark: #3d6810;   /* Hover, 6.59:1                                 */
  --accent-soft: #eff6e2;
  --line:        rgba(31, 31, 31, 0.10);
  --line-strong: rgba(31, 31, 31, 0.20);

  /* Schrift — Montserrat (Ueberschriften) und Open Sans (Fliesstext) wie auf
     Briefbogen und Berichten. Lokal eingebunden, kein Google-CDN.            */
  --font-body: "Open Sans", -apple-system, BlinkMacSystemFont, "Segoe UI",
               system-ui, Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: "Montserrat", -apple-system, BlinkMacSystemFont, "Segoe UI",
               system-ui, Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  /* Type-Skala — Tracking negativ oben, 0 im Body, positiv im Kleintext      */
  --fs-display: clamp(2.375rem, 5.4vw, 4.5rem);   /* Montserrat laeuft breiter */
  --fs-h1:      clamp(2rem, 4.1vw, 3.125rem);
  --fs-h2:      clamp(1.625rem, 2.9vw, 2.25rem);
  --fs-h3:      clamp(1.125rem, 1.5vw, 1.3125rem);
  --fs-lead:    clamp(1.0625rem, 1.35vw, 1.1875rem);
  --fs-body:    1.0625rem;
  --fs-small:   0.9375rem;
  --fs-kicker:  0.8125rem;

  /* Abstands-Skala — eine Reihe, keine Zufallswerte                          */
  --s1: 0.25rem; --s2: 0.5rem;  --s3: 0.75rem; --s4: 1rem;   --s5: 1.5rem;
  --s6: 2rem;    --s7: 3rem;    --s8: 4rem;    --s9: 6rem;   --s10: 8rem;
  --s11: 12rem;

  --wrap: 76rem;
  --wrap-narrow: 46rem;
  --radius:    14px;
  --radius-sm: 10px;
  --radius-lg: 22px;

  /* Springs — aus dem Federmodell gerechnet, nicht handgemalt.
     std    : zeta 1.0, response 0.34s  -> kein Ueberschwingen, Standard-UI
     soft   : zeta 1.0, response 0.50s  -> grosse Flaechen, Sheets, Reveals
     bounce : zeta 0.8, response 0.34s  -> nur wo die Geste selbst Schwung hatte */
  --dur-std: 0.50s;
  --spring-std: linear(0, 0.0205, 0.0713, 0.1398, 0.217, 0.2969, 0.3756, 0.4504, 0.5198,
    0.5831, 0.64, 0.6906, 0.7352, 0.7742, 0.8081, 0.8373, 0.8625, 0.884, 0.9024, 0.918,
    0.9313, 0.9425, 0.9519, 0.9599, 0.9666, 0.9722, 0.9769, 0.9808, 0.9841, 0.9868,
    0.9891, 0.9909, 0.9925, 0.9938, 0.9949, 0.9958, 0.9965, 0.9971, 0.9976, 0.9981,
    0.9984, 0.9987, 1);
  --dur-soft: 0.72s;
  --spring-soft: linear(0, 0.02, 0.0697, 0.1368, 0.2127, 0.2915, 0.3693, 0.4434, 0.5125,
    0.5757, 0.6326, 0.6834, 0.7283, 0.7677, 0.802, 0.8317, 0.8573, 0.8793, 0.8982,
    0.9142, 0.9279, 0.9395, 0.9493, 0.9575, 0.9645, 0.9704, 0.9753, 0.9794, 0.9829,
    0.9858, 0.9882, 0.9902, 0.9919, 0.9933, 0.9944, 0.9954, 0.9962, 0.9968, 0.9974,
    0.9978, 0.9982, 0.9985, 1);
  --dur-bounce: 0.47s;
  --spring-bounce: linear(0, 0.0188, 0.0672, 0.1353, 0.2151, 0.3006, 0.3871, 0.4713,
    0.5507, 0.624, 0.6902, 0.7489, 0.8002, 0.8442, 0.8815, 0.9127, 0.9382, 0.9588,
    0.9751, 0.9877, 0.9973, 1.0043, 1.0092, 1.0123, 1.0142, 1.015, 1.0151, 1.0146,
    1.0138, 1.0126, 1.0114, 1.0101, 1.0088, 1.0075, 1.0063, 1.0053, 1.0043, 1.0035,
    1.0027, 1.0021, 1.0016, 1.0012, 1);

  --press: 100ms;
  --header-h: 76px;
}

/* --------------------------------------------------------------------------
   2 · Reset & Basis
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + var(--s4));
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.65;          /* Open Sans hat eine hohe x-Hoehe, braucht Luft */
  letter-spacing: 0;                 /* Body exakt 0 — Kap. 15 */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }

:focus-visible {
  outline: 2px solid var(--accent-ink);
  outline-offset: 3px;
  border-radius: 4px;
}

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

.skip-link {
  position: absolute; left: var(--s4); top: var(--s4);
  z-index: 200;
  transform: translateY(-200%);
  background: var(--ink); color: #fff;
  padding: var(--s3) var(--s5);
  border-radius: var(--radius-sm);
  transition: transform var(--dur-std) var(--spring-std);
}
.skip-link:focus { transform: translateY(0); }

.visually-hidden {
  position: absolute !important; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

/* --------------------------------------------------------------------------
   3 · Typografie
   -------------------------------------------------------------------------- */
/* Deutsche Komposita wie "Gefahrstoffverordnung" sprengen sonst schmale
   Spalten - Trennung erlauben, Umbruch als Notausgang. */
h1, h2, h3, h4 {
  font-family: var(--font-display); font-weight: 600; margin: 0;
  text-wrap: balance;
  hyphens: auto; -webkit-hyphens: auto;
  overflow-wrap: break-word;
}

/* Montserrat sitzt enger als eine UI-Schrift, deshalb weniger negatives
   Tracking als bei SF Pro - sonst kleben die Versalien aneinander. */
.t-display { font-size: var(--fs-display); letter-spacing: -0.022em; line-height: 1.06; font-weight: 700; }
h1, .t-h1    { font-size: var(--fs-h1); letter-spacing: -0.018em; line-height: 1.1; font-weight: 700; }
h2, .t-h2    { font-size: var(--fs-h2); letter-spacing: -0.014em; line-height: 1.16; }
h3, .t-h3    { font-size: var(--fs-h3); letter-spacing: -0.005em; line-height: 1.32; }

p { margin: 0 0 var(--s4); }
p:last-child { margin-bottom: 0; }

.lead {
  font-size: var(--fs-lead);
  line-height: 1.6;
  letter-spacing: 0;
  color: var(--ink-soft);
  max-width: 40ch;
  text-wrap: pretty;
}

.kicker {
  display: inline-flex; align-items: center; gap: var(--s2);
  font-family: var(--font-display);
  font-size: var(--fs-kicker);
  letter-spacing: 0.1em;             /* Kleintext leicht positiv — Kap. 15 */
  line-height: 1.3;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--accent-ink);
  margin: 0 0 var(--s4);
}
.kicker::before {
  content: ""; width: 22px; height: 2px; border-radius: 2px;
  background: var(--accent); flex: 0 0 auto;
}

.num {
  font-family: var(--font-mono);
  font-size: var(--fs-kicker);
  letter-spacing: 0.06em;
  color: var(--ink-mute);
  font-variant-numeric: tabular-nums;
}

/* --------------------------------------------------------------------------
   4 · Layout
   -------------------------------------------------------------------------- */
.wrap { width: min(100% - 2 * var(--s5), var(--wrap)); margin-inline: auto; }
.wrap-narrow { width: min(100% - 2 * var(--s5), var(--wrap-narrow)); margin-inline: auto; }

.section { padding-block: clamp(var(--s8), 9vw, var(--s10)); }
.section-tight { padding-block: clamp(var(--s7), 6vw, var(--s8)); }
.section-soft { background: var(--surface); }

.section-head { max-width: 52ch; margin-bottom: var(--s7); }
.rule { height: 1px; background: var(--line); border: 0; margin: 0; }

/* --------------------------------------------------------------------------
   5 · Header — Glas, Inhalt scrollt darunter durch (Kap. 12)
   -------------------------------------------------------------------------- */
.header {
  position: sticky; top: 0; z-index: 100;
  height: var(--header-h);
  display: flex; align-items: center;
  background: rgba(255, 255, 255, 0.62);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
}
/* Weiche Scroll-Kante statt 1px-Linie — blendet erst beim Scrollen ein */
.header::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -18px; height: 18px;
  background: linear-gradient(to bottom, rgba(31, 31, 31, 0.07), rgba(31, 31, 31, 0));
  opacity: 0; transform: scaleY(0.4); transform-origin: top;
  transition: opacity var(--dur-soft) var(--spring-soft),
              transform var(--dur-soft) var(--spring-soft);
  pointer-events: none;
}
.header.is-scrolled::after { opacity: 1; transform: scaleY(1); }

.header-inner {
  width: min(100% - 2 * var(--s5), var(--wrap));
  margin-inline: auto;
  display: flex; align-items: center; gap: var(--s5);
}

.brand { display: inline-flex; align-items: center; margin-right: auto; }
.brand img { height: 48px; width: auto; }
.brand:active { transform: scale(0.97); }
.brand { transition: transform var(--press) linear; }

.nav { display: flex; align-items: center; gap: var(--s1); }
.nav a {
  position: relative;
  padding: var(--s2) var(--s3);
  border-radius: var(--radius-sm);
  font-size: var(--fs-small);
  color: var(--ink-soft);
  transition: color var(--dur-std) var(--spring-std),
              transform var(--press) linear;
}
.nav a:hover { color: var(--ink); }
.nav a:active { transform: scale(0.97); }
.nav a[aria-current="page"] { color: var(--ink); font-weight: 600; }
.nav a[aria-current="page"]::after {
  content: ""; position: absolute; left: var(--s3); right: var(--s3); bottom: 2px;
  height: 2px; border-radius: 2px; background: var(--accent);
}

.header-cta { display: inline-flex; }
.nav-toggle { display: none; }

/* Mobiles Menue — waechst aus dem Button (transform-origin), gleicher Weg zurueck */
.nav-sheet { display: contents; }

@media (max-width: 61.99em) {
  .nav-toggle {
    display: inline-flex; align-items: center; justify-content: center;
    width: 44px; height: 44px; margin-left: auto;
    border: 1px solid var(--line); border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    transition: transform var(--press) linear, background var(--dur-std) var(--spring-std);
  }
  .nav-toggle:active { transform: scale(0.97); }
  .nav-toggle span {
    display: block; width: 17px; height: 1.5px; border-radius: 2px; background: var(--ink);
    position: relative;
    transition: transform var(--dur-std) var(--spring-std);
  }
  .nav-toggle span::before, .nav-toggle span::after {
    content: ""; position: absolute; left: 0; width: 17px; height: 1.5px;
    border-radius: 2px; background: var(--ink);
    transition: transform var(--dur-std) var(--spring-std);
  }
  .nav-toggle span::before { transform: translateY(-5.5px); }
  .nav-toggle span::after  { transform: translateY(5.5px); }
  .nav-toggle[aria-expanded="true"] span { transform: rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span::before { transform: rotate(-90deg); }
  .nav-toggle[aria-expanded="true"] span::after  { transform: scaleX(0); }

  .header-cta { display: none; }

  .nav-sheet {
    display: block;
    position: fixed; inset: var(--header-h) 0 auto 0;
    padding: var(--s5) var(--s5) var(--s7);
    background: rgba(255, 255, 255, 0.9);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid var(--line);
    transform-origin: top right;      /* waechst aus dem Toggle — Kap. 7 */
    transform: scale(0.96) translateY(-10px);
    opacity: 0; visibility: hidden;
    transition: transform var(--dur-std) var(--spring-std),
                opacity 180ms linear,
                visibility 0s linear var(--dur-std);
  }
  .nav-sheet.is-open {
    transform: none; opacity: 1; visibility: visible;
    transition: transform var(--dur-std) var(--spring-std),
                opacity 140ms linear,
                visibility 0s;
  }
  .nav { flex-direction: column; align-items: stretch; gap: 0; }
  .nav a { padding: var(--s3) var(--s2); font-size: 1.125rem; border-bottom: 1px solid var(--line); border-radius: 0; }
  .nav a[aria-current="page"]::after { display: none; }
  .nav-sheet .button { margin-top: var(--s5); width: 100%; justify-content: center; }
}

/* --------------------------------------------------------------------------
   6 · Buttons — Feedback beim Runterdruecken (Kap. 1)
   -------------------------------------------------------------------------- */
.button {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s2);
  padding: 0.8125rem var(--s5);
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: -0.005em;
  cursor: pointer;
  white-space: nowrap;
  transition: transform var(--press) linear,
              background-color var(--dur-std) var(--spring-std),
              border-color var(--dur-std) var(--spring-std),
              color var(--dur-std) var(--spring-std);
}
.button:active { transform: scale(0.97); }

.button-primary { background: var(--accent-ink); color: #fff; }
.button-primary:hover { background: var(--accent-dark); }

.button-ghost { background: transparent; color: var(--ink); border-color: var(--line-strong); }
.button-ghost:hover { border-color: var(--ink); background: rgba(31, 31, 31, 0.03); }

.button-lg { padding: 1rem var(--s6); font-size: var(--fs-body); }

.actions { display: flex; flex-wrap: wrap; gap: var(--s3); }

/* Tertiaer: nur Text mit Pfeil, Pfeil laeuft in Bewegungsrichtung voraus */
.link-arrow {
  display: inline-flex; align-items: center; gap: var(--s2);
  font-size: var(--fs-small); font-weight: 600; color: var(--accent-ink);
  white-space: nowrap;
  transition: transform var(--press) linear;
}
.link-arrow:active { transform: scale(0.97); }
.link-arrow svg {
  flex: 0 0 auto; width: 18px; height: 18px;
  transition: transform var(--dur-std) var(--spring-std);
}
.link-arrow:hover svg { transform: translateX(4px); }

/* --------------------------------------------------------------------------
   7 · Hero
   -------------------------------------------------------------------------- */
.hero { position: relative; padding-block: clamp(var(--s8), 10vw, var(--s11)) clamp(var(--s7), 7vw, var(--s9)); overflow: hidden; }

/* Sehr leichtes Baurasterr — industrieller Grundton, fast unsichtbar */
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(31, 31, 31, 0.026) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(31, 31, 31, 0.026) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: radial-gradient(110% 76% at 50% 0%, #000 0%, transparent 62%);
  mask-image: radial-gradient(110% 76% at 50% 0%, #000 0%, transparent 62%);
}
.hero > * { position: relative; z-index: 1; }

.hero-grid { display: grid; gap: var(--s7); align-items: end; }
@media (min-width: 62em) {
  .hero-grid { grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); gap: var(--s9); }
}

.hero h1 { max-width: 16ch; }
.hero .lead { margin-top: var(--s5); max-width: 42ch; }
.hero .actions { margin-top: var(--s6); }

.hero-meta { display: grid; gap: var(--s4); }
.hero-meta-item {
  display: flex; gap: var(--s4); align-items: baseline;
  padding-bottom: var(--s4); border-bottom: 1px solid var(--line);
}
.hero-meta-item:last-child { border-bottom: 0; padding-bottom: 0; }
.hero-meta-item strong { font-weight: 600; letter-spacing: -0.01em; }
.hero-meta-item p { font-size: var(--fs-small); color: var(--ink-soft); margin: var(--s1) 0 0; }

/* Welle unter dem Hero — zeichnet sich beim Laden einmal, dann Ruhe */
.hero-wave { margin-top: clamp(var(--s7), 7vw, var(--s9)); }
.hero-wave svg { width: 100%; height: auto; overflow: visible; }
.hero-wave .wave-path {
  fill: none; stroke: var(--accent); stroke-width: 2.5; stroke-linecap: round;
  opacity: 0.85;
}

/* --------------------------------------------------------------------------
   8 · Blatt-Spine — die vier Saeulen
   -------------------------------------------------------------------------- */
.spine { position: relative; margin-top: var(--s8); }

.spine-svg {
  position: absolute; inset: 0; width: 100%; height: 100%;
  pointer-events: none; z-index: 0; overflow: visible;
}
.spine-ghost {
  fill: none; stroke: var(--line); stroke-width: 2; stroke-linecap: round;
  stroke-dasharray: 1 7;             /* zeigt an, wohin es geht — Kap. 8 */
}
.spine-live {
  fill: none; stroke: url(#spineGradient); stroke-width: 3; stroke-linecap: round;
  will-change: stroke-dashoffset;
}
.spine-leaf { opacity: 0; will-change: transform; }
.spine-leaf-shape { fill: var(--accent); }

.pillar-list {
  position: relative; z-index: 1;
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: clamp(var(--s8), 10vw, var(--s10));
}

/* Schmal: Knoten als linke Schiene, Karte daneben - der Pfad bleibt sichtbar.
   Breit: Karte und Knoten wechseln die Seite, der Pfad schlaengelt dazwischen. */
.pillar {
  display: grid; align-items: center;
  grid-template-columns: 42px minmax(0, 1fr);
  column-gap: var(--s3);
}
.pillar .pillar-anchor { grid-column: 1; grid-row: 1; justify-content: flex-start; padding-left: 8px; }
.pillar:nth-child(even) .pillar-anchor { padding-left: 22px; }  /* leichte Welle statt Lineal */
.pillar .pillar-card   { grid-column: 2; grid-row: 1; }

@media (min-width: 62em) {
  .pillar { grid-template-columns: 1fr 1fr; column-gap: var(--s8); }
  .pillar .pillar-anchor,
  .pillar:nth-child(even) .pillar-anchor { justify-content: center; padding-left: 0; }
  .pillar:nth-child(odd)  .pillar-card   { grid-column: 1; grid-row: 1; }
  .pillar:nth-child(odd)  .pillar-anchor { grid-column: 2; grid-row: 1; }
  .pillar:nth-child(even) .pillar-card   { grid-column: 2; grid-row: 1; }
  .pillar:nth-child(even) .pillar-anchor { grid-column: 1; grid-row: 1; }
}

.pillar-anchor { display: flex; align-items: center; min-height: 40px; }

.pillar-node {
  position: relative;
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--page);
  box-shadow: inset 0 0 0 2px var(--line-strong);
  transform: scale(0.8);
  transition: transform var(--dur-bounce) var(--spring-bounce),
              box-shadow var(--dur-std) var(--spring-std),
              background-color var(--dur-std) var(--spring-std);
}
.pillar-node::after {
  content: ""; position: absolute; inset: -11px; border-radius: 50%;
  background: var(--accent);
  opacity: 0; transform: scale(0.6);
  transition: opacity var(--dur-soft) var(--spring-soft),
              transform var(--dur-soft) var(--spring-soft);
}
.pillar.is-lit .pillar-node {
  background: var(--accent);
  box-shadow: inset 0 0 0 2px var(--accent);
  transform: scale(1);
}
.pillar.is-lit .pillar-node::after { opacity: 0.14; transform: scale(1); }

.pillar-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(var(--s5), 3.4vw, var(--s7));
  opacity: 0.55;
  transform: translateY(14px) scale(0.985);
  transition: opacity var(--dur-soft) var(--spring-soft),
              transform var(--dur-soft) var(--spring-soft),
              border-color var(--dur-soft) var(--spring-soft);
}
.pillar.is-lit .pillar-card {
  opacity: 1; transform: none;
  border-color: rgba(107, 170, 31, 0.34);
}

.pillar-head { display: flex; align-items: center; gap: var(--s4); margin-bottom: var(--s5); }
.pillar-icon {
  flex: 0 0 auto;
  width: 54px; height: 54px; border-radius: var(--radius);
  display: grid; place-items: center;
  background: var(--page);
  border: 1px solid var(--line);
}
.pillar-icon svg { width: 28px; height: 28px; }
.pillar-icon [stroke] { stroke: var(--accent-ink); }

.pillar-card h3 { margin-bottom: var(--s3); }
.pillar-card > p { color: var(--ink-soft); }

.pillar-points {
  list-style: none; margin: var(--s5) 0 var(--s5); padding: 0;
  display: grid; gap: var(--s2);
  font-size: var(--fs-small); color: var(--ink-soft);
}
.pillar-points li { display: flex; gap: var(--s3); align-items: baseline; }
.pillar-points li::before {
  content: ""; flex: 0 0 auto; width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent-brt); transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   9 · Karten, Raster, Prozess
   -------------------------------------------------------------------------- */
.grid-2 { display: grid; gap: var(--s6); }
.grid-3 { display: grid; gap: var(--s5); }
.grid-4 { display: grid; gap: var(--s5); }
@media (min-width: 46em) { .grid-2 { grid-template-columns: repeat(2, 1fr); } .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 62em) { .grid-3 { grid-template-columns: repeat(3, 1fr); } .grid-4 { grid-template-columns: repeat(4, 1fr); } }

.card {
  background: var(--page);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--s6);
  transition: transform var(--dur-std) var(--spring-std),
              border-color var(--dur-std) var(--spring-std);
}
.card h3 { margin-bottom: var(--s3); }
.card p { color: var(--ink-soft); font-size: var(--fs-small); }
a.card:hover { transform: translateY(-3px); border-color: var(--line-strong); }
a.card:active { transform: scale(0.985); transition: transform var(--press) linear; }

.card-icon {
  width: 44px; height: 44px; border-radius: var(--radius-sm);
  display: grid; place-items: center; margin-bottom: var(--s5);
  background: var(--accent-soft);
}
.card-icon svg { width: 24px; height: 24px; }
.card-icon [stroke] { stroke: var(--accent-dark); }

.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; counter-reset: step; }
.step {
  display: grid; gap: var(--s4);
  padding-block: var(--s6);
  border-top: 1px solid var(--line);
}
.step:last-child { border-bottom: 1px solid var(--line); }
@media (min-width: 46em) { .step { grid-template-columns: 6rem minmax(0, 22ch) minmax(0, 1fr); gap: var(--s6); align-items: start; } }
.step h3 { letter-spacing: -0.015em; }
.step p { color: var(--ink-soft); margin: 0; }

.facts { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.facts li {
  display: flex; gap: var(--s4); align-items: baseline;
  padding-block: var(--s4); border-bottom: 1px solid var(--line);
}
.facts li:first-child { border-top: 1px solid var(--line); }
.facts svg { flex: 0 0 auto; width: 18px; height: 18px; transform: translateY(3px); }
.facts li > span { min-width: 0; }
.facts [stroke] { stroke: var(--accent-ink); }

/* Grosses Statement */
.statement { text-align: center; }
.statement .t-h1 { max-width: 22ch; margin-inline: auto; }
.statement .lead { margin: var(--s5) auto 0; text-align: center; }

/* Detail-Bloecke auf der Leistungsseite */
.detail { padding-block: clamp(var(--s7), 7vw, var(--s9)); border-top: 1px solid var(--line); }
.detail:first-of-type { border-top: 0; }
.detail-grid { display: grid; gap: var(--s6); }
@media (min-width: 62em) { .detail-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: var(--s9); } }
.detail-side { position: relative; }
@media (min-width: 62em) { .detail-side { position: sticky; top: calc(var(--header-h) + var(--s6)); align-self: start; } }
.detail-mark {
  width: 76px; height: 76px; border-radius: var(--radius);
  display: grid; place-items: center; margin-bottom: var(--s5);
  background: var(--accent-soft);
}
.detail-mark svg { width: 40px; height: 40px; }
.detail-mark [stroke] { stroke: var(--accent-dark); }

/* --------------------------------------------------------------------------
   10 · Kontakt & Formular
   -------------------------------------------------------------------------- */
.contact-grid { display: grid; gap: var(--s8); }
@media (min-width: 62em) { .contact-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: var(--s9); } }

.contact-list { list-style: none; margin: var(--s6) 0 0; padding: 0; display: grid; gap: var(--s2); }
.contact-list a, .contact-list span {
  display: flex; align-items: center; gap: var(--s4);
  padding: var(--s4) 0; border-bottom: 1px solid var(--line);
  transition: transform var(--press) linear;
}
.contact-list a:active { transform: scale(0.985); }
.contact-list svg { flex: 0 0 auto; width: 20px; height: 20px; }
.contact-list [stroke] { stroke: var(--accent-ink); }
.contact-list strong { font-weight: 600; letter-spacing: -0.01em; }
.contact-list small { display: block; font-size: var(--fs-kicker); letter-spacing: 0.04em; color: var(--ink-mute); text-transform: uppercase; }

.form { display: grid; gap: var(--s5); }
.field { display: grid; gap: var(--s2); }
.field label { font-size: var(--fs-small); font-weight: 600; letter-spacing: -0.005em; }
.field input, .field textarea, .field select {
  font: inherit; color: var(--ink);
  padding: 0.8125rem var(--s4);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  transition: border-color var(--dur-std) var(--spring-std),
              background-color var(--dur-std) var(--spring-std);
}
.field textarea { resize: vertical; min-height: 9rem; }
.field input:focus, .field textarea:focus, .field select:focus {
  border-color: var(--accent-ink); background: var(--page);
}
.field-hint { font-size: var(--fs-kicker); color: var(--ink-mute); letter-spacing: 0.01em; }
.field-check { display: flex; gap: var(--s3); align-items: flex-start; font-size: var(--fs-small); color: var(--ink-soft); }
.field-check input { margin-top: 0.28rem; accent-color: var(--accent-ink); }
.form-note {
  font-size: var(--fs-small); color: var(--ink-soft);
  background: var(--accent-soft); border-radius: var(--radius-sm);
  padding: var(--s4); border: 1px solid rgba(107, 170, 31, 0.24);
}

/* --------------------------------------------------------------------------
   11 · CTA-Band & Footer
   -------------------------------------------------------------------------- */
.cta-band {
  background: var(--ink); color: #fff;
  border-radius: var(--radius-lg);
  padding: clamp(var(--s7), 6vw, var(--s9));
  display: grid; gap: var(--s6); align-items: center;
}
@media (min-width: 62em) { .cta-band { grid-template-columns: minmax(0, 1fr) auto; gap: var(--s8); } }
.cta-band h2 { color: #fff; max-width: 20ch; }
.cta-band p { color: rgba(255, 255, 255, 0.72); margin-top: var(--s4); max-width: 46ch; }
.cta-band .button-ghost { color: #fff; border-color: rgba(255, 255, 255, 0.32); }
.cta-band .button-ghost:hover { border-color: #fff; background: rgba(255, 255, 255, 0.08); }

.footer { border-top: 1px solid var(--line); padding-block: var(--s8) var(--s6); margin-top: var(--s9); }
.footer-grid { display: grid; gap: var(--s6); }
@media (min-width: 62em) { .footer-grid { grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 1fr)); gap: var(--s7); } }
.footer img { height: 44px; width: auto; margin-bottom: var(--s4); }
.footer h4 { font-size: var(--fs-kicker); letter-spacing: 0.09em; text-transform: uppercase; color: var(--ink-mute); margin-bottom: var(--s4); font-weight: 600; }
.footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--s2); }
.footer a {
  font-size: var(--fs-small); color: var(--ink-soft);
  transition: color var(--dur-std) var(--spring-std);
}
.footer a:hover { color: var(--ink); }
.footer p { font-size: var(--fs-small); color: var(--ink-soft); }
.footer-base {
  margin-top: var(--s7); padding-top: var(--s5); border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: var(--s4) var(--s5); justify-content: space-between;
  font-size: var(--fs-kicker); color: var(--ink-mute); letter-spacing: 0.02em;
}

/* Klar markierte Platzhalter — nichts erfinden */
.placeholder {
  display: inline-block;
  background: #fff5d6; border: 1px dashed #d8b64a; border-radius: 6px;
  padding: 0.05em 0.4em; color: #6b5310;
  font-size: 0.94em; font-style: normal;
}

/* --------------------------------------------------------------------------
   12 · Reveal beim Scrollen — nur transform + opacity (Kap. 11)
   -------------------------------------------------------------------------- */
[data-reveal] {
  opacity: 0; transform: translateY(16px);
  transition: opacity var(--dur-soft) var(--spring-soft),
              transform var(--dur-soft) var(--spring-soft);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].is-in { opacity: 1; transform: none; }
.no-js [data-reveal] { opacity: 1; transform: none; }

/* --------------------------------------------------------------------------
   13 · prefers-* — alle drei Signale (Kap. 14)
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
    scroll-behavior: auto !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .pillar-card { opacity: 1; transform: none; }
  .link-arrow:hover svg { transform: none; }
}

@media (prefers-reduced-transparency: reduce) {
  .header { background: #fff; border-bottom: 1px solid var(--line); backdrop-filter: none; -webkit-backdrop-filter: none; }
  .header::after { display: none; }
  .nav-sheet { background: #fff; backdrop-filter: none; -webkit-backdrop-filter: none; }
}

@media (prefers-contrast: more) {
  :root { --ink-soft: #2e322b; --ink-mute: #45493f; --line: rgba(31, 31, 31, 0.34); --line-strong: rgba(31, 31, 31, 0.6); --accent: #4a7d12; --accent-ink: #3d6810; }
  .header { background: #fff; backdrop-filter: none; -webkit-backdrop-filter: none; border-bottom: 1px solid var(--line-strong); }
  .card, .pillar-card, .field input, .field textarea { border-color: var(--line-strong); }
  .button-primary { border-color: var(--ink); }
  a:not(.button) { text-decoration: underline; text-underline-offset: 0.2em; }
}

/* Hoher Kontrast aus dem Barrierefreiheit-Menue */
html.a11y-contrast .header { background: #fff; backdrop-filter: none; -webkit-backdrop-filter: none; border-bottom: 1px solid var(--ink); }
html.a11y-contrast .header::after { display: none; }
html.a11y-contrast .spine-ghost { stroke: var(--ink); }
html.a11y-contrast .pillar-card { opacity: 1; transform: none; }
html.a11y-contrast .placeholder { background: #fff; border-color: var(--ink); color: var(--ink); }

/* Animationen aus dem Barrierefreiheit-Menue */
html.a11y-no-anim .pillar-card { opacity: 1; transform: none; }
html.a11y-no-anim [data-reveal] { opacity: 1; transform: none; }

@media print {
  .header, .footer, .spine-svg, .cta-band { display: none !important; }
  body { color: #000; }
}

/* --------------------------------------------------------------------------
   14 · FAQ — Aufklappen ohne Sprung, Marker als Plus
   -------------------------------------------------------------------------- */
.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  display: flex; align-items: center; gap: var(--s4);
  padding-block: var(--s5);
  font-family: var(--font-display);
  font-size: var(--fs-h3); font-weight: 600; letter-spacing: -0.01em; line-height: 1.3;
  cursor: pointer; list-style: none;
  transition: color var(--dur-std) var(--spring-std);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--accent-ink); }
.faq summary::after {
  content: ""; flex: 0 0 auto; margin-left: auto;
  width: 14px; height: 14px;
  background:
    linear-gradient(var(--accent-ink), var(--accent-ink)) center / 14px 1.8px no-repeat,
    linear-gradient(var(--accent-ink), var(--accent-ink)) center / 1.8px 14px no-repeat;
  transition: transform var(--dur-std) var(--spring-std);
}
.faq details[open] summary::after { transform: rotate(135deg); }
.faq details > p {
  margin: 0 0 var(--s6);
  max-width: 68ch; color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   15 · Ohne JavaScript bleibt alles lesbar
   -------------------------------------------------------------------------- */
.no-js .pillar-card { opacity: 1; transform: none; }
.no-js .spine-svg { display: none; }
.no-js .nav-sheet { display: block; }

/* --------------------------------------------------------------------------
   16 · Hinweisband, Stolpersteine, Zeitkasten, Chips
   -------------------------------------------------------------------------- */

/* Hinweisband auf die GefStoffV — die staerkste Nachfragequelle, deshalb
   direkt unter dem Hero und als ganze Flaeche anklickbar. */
.notice {
  display: flex; align-items: center; gap: var(--s5);
  padding: var(--s5) var(--s6);
  background: var(--accent-soft);
  border: 1px solid rgba(107, 170, 31, 0.28);
  border-radius: var(--radius-lg);
  transition: transform var(--dur-std) var(--spring-std),
              border-color var(--dur-std) var(--spring-std);
}
.notice:hover { transform: translateY(-2px); border-color: rgba(107, 170, 31, 0.5); }
.notice:active { transform: scale(0.995); transition: transform var(--press) linear; }
.notice-icon {
  flex: 0 0 auto; width: 46px; height: 46px; border-radius: var(--radius-sm);
  display: grid; place-items: center; background: var(--page);
}
.notice-icon svg { width: 26px; height: 26px; }
.notice-icon [stroke] { stroke: var(--accent-ink); }
.notice-body { display: grid; gap: var(--s1); min-width: 0; }
.notice-body strong { font-family: var(--font-display); letter-spacing: -0.01em; }
.notice-body span { font-size: var(--fs-small); color: var(--ink-soft); }
.notice-arrow { flex: 0 0 auto; margin-left: auto; }
.notice-arrow svg { width: 22px; height: 22px; }
.notice-arrow [stroke] { stroke: var(--accent-ink); }
.notice-arrow svg { transition: transform var(--dur-std) var(--spring-std); }
.notice:hover .notice-arrow svg { transform: translateX(4px); }
@media (max-width: 45.99em) {
  .notice { flex-wrap: wrap; gap: var(--s4); }
  .notice-arrow { margin-left: 0; }
}

/* Was in der Praxis schiefgeht — nummeriert, weil die Reihenfolge dem
   zeitlichen Ablauf im Projekt folgt. */
.pitfalls { list-style: none; margin: 0; padding: 0; counter-reset: pit; display: grid; gap: 0; }
.pitfalls li {
  counter-increment: pit;
  display: grid; gap: var(--s2);
  padding: var(--s5) 0 var(--s5) var(--s8);
  border-top: 1px solid var(--line);
  position: relative;
}
.pitfalls li:last-child { border-bottom: 1px solid var(--line); }
.pitfalls li::before {
  content: counter(pit, decimal-leading-zero);
  position: absolute; left: 0; top: var(--s5);
  font-family: var(--font-mono); font-size: var(--fs-kicker);
  letter-spacing: 0.06em; color: var(--accent-ink); font-weight: 600;
}
.pitfalls h3 { letter-spacing: -0.008em; }
.pitfalls p { color: var(--ink-soft); margin: 0; max-width: 72ch; }

/* Zeitfenster als drei Kennzahlen */
.timebox {
  display: grid; gap: var(--s5);
  margin-top: var(--s8);
  padding: var(--s6);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}
@media (min-width: 46em) { .timebox { grid-template-columns: repeat(3, 1fr); gap: var(--s7); } }
.timebox .num { display: block; margin-bottom: var(--s2); }
.timebox strong {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.375rem, 2.2vw, 1.75rem);
  letter-spacing: -0.015em; line-height: 1.2;
  color: var(--accent-ink);
}
.timebox p { margin: var(--s2) 0 0; font-size: var(--fs-small); color: var(--ink-soft); }

/* Einschub im Fliesstext */
.callout {
  display: flex; gap: var(--s4);
  padding: var(--s5);
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
}
.callout p { font-size: var(--fs-small); color: var(--ink-soft); margin: 0; }
.callout p + p { margin-top: var(--s3); }
.callout-warn { background: #fdf8e8; border-color: #e6d9a8; border-left-color: #c9a227; }
.callout-icon { flex: 0 0 auto; }
.callout-icon svg { width: 22px; height: 22px; }
.callout-warn .callout-icon [stroke] { stroke: #a3821c; }

/* Auftraggeber als Chips */
.chips { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: var(--s3); }
.chips li {
  padding: var(--s2) var(--s4);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: var(--fs-small);
  color: var(--ink-soft);
}

.field-opt { font-weight: 400; color: var(--ink-mute); }

.detail-mark [stroke] { stroke: var(--accent-dark); }

/* --------------------------------------------------------------------------
   17 · Formular-Rueckmeldung
   -------------------------------------------------------------------------- */
.form-status {
  margin: var(--s3) 0 0;
  font-size: var(--fs-small);
  line-height: 1.5;
  min-height: 1.5em;               /* kein Sprung, wenn Text erscheint */
}
.form-status:empty { margin-top: 0; }
.form-status.is-ok {
  color: var(--accent-dark);
  padding: var(--s3) var(--s4);
  background: var(--accent-soft);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(107, 170, 31, 0.28);
}
.form-status.is-error {
  color: #8a2b16;
  padding: var(--s3) var(--s4);
  background: #fdefea;
  border-radius: var(--radius-sm);
  border: 1px solid #ecccc0;
}

/* Feld, das der Browser als ungueltig meldet */
.field input[aria-invalid="true"],
.field textarea[aria-invalid="true"] {
  border-color: #c2553a;
  background: #fdf7f5;
}