/* =========================================================
   wasserdach.org — Wasser — Alles Fließt
   Design-System · statisch, KI-gebaut
   ========================================================= */

:root {
  --tief:      #072a3f;   /* Tiefblau  */
  --tief-2:    #0a3a54;
  --wasser:    #12a3b0;   /* Türkis    */
  --wasser-2:  #2ec4c9;
  --hell:      #eef7f9;   /* Weiß-Blau */
  --weiss:     #ffffff;
  --grau:      #5b7280;
  --linie:     #d8e7ec;
  --schatten:  0 10px 40px rgba(7, 42, 63, 0.10);
  --radius:    16px;
  --breite:    1120px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--tief);
  background: var(--weiss);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container { width: min(100% - 2.5rem, var(--breite)); margin-inline: auto; }

a { color: var(--wasser); text-decoration: none; transition: color .2s; }
a:hover { color: var(--tief); }

h1, h2, h3 { line-height: 1.2; font-weight: 700; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.3rem); }
h3 { font-size: 1.2rem; }
p  { color: #33505f; }

.section { padding: clamp(3rem, 8vw, 6rem) 0; }
.section--hell { background: var(--hell); }
.lead { font-size: 1.2rem; max-width: 62ch; }
.eyebrow {
  text-transform: uppercase; letter-spacing: .18em; font-size: .8rem;
  font-weight: 700; color: var(--wasser);
}
.center { text-align: center; }
.center .lead { margin-inline: auto; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .85rem 1.6rem; border-radius: 999px; font-weight: 600;
  transition: transform .15s, box-shadow .2s;
}
.btn--primary {
  background: linear-gradient(120deg, var(--wasser), var(--wasser-2));
  color: #fff; box-shadow: 0 8px 24px rgba(18,163,176,.35);
}
.btn--primary:hover { color:#fff; transform: translateY(-2px); }
.btn--ghost { border: 1.5px solid rgba(255,255,255,.5); color:#fff; }
.btn--ghost:hover { color:#fff; background: rgba(255,255,255,.12); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.85); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--linie);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; align-items: center; gap: .6rem; font-weight: 800; color: var(--tief); font-size: 1.05rem; }
.brand .drop { font-size: 1.4rem; }
.nav-links { display: flex; gap: 1.8rem; list-style: none; align-items: center; }
.nav-links a { color: var(--tief); font-weight: 500; }
.nav-links a:hover { color: var(--wasser); }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; font-size: 1.6rem; color: var(--tief); }

/* ---------- Hero ---------- */
.hero {
  position: relative; color: #fff; overflow: hidden;
  background: linear-gradient(160deg, var(--tief) 0%, var(--tief-2) 45%, var(--wasser) 130%);
}
.hero .container { position: relative; z-index: 2; padding: clamp(4rem, 12vw, 8rem) 0; }
.hero h1 { color: #fff; max-width: 16ch; }
.hero .lead { color: rgba(255,255,255,.85); margin-top: 1.25rem; }
.hero .actions { margin-top: 2rem; display: flex; gap: 1rem; flex-wrap: wrap; }
.hero .quote { margin-top: 2.5rem; font-style: italic; color: rgba(255,255,255,.7); }
.waves { position: absolute; bottom: -1px; left: 0; width: 100%; z-index: 1; line-height: 0; }
.waves svg { width: 100%; height: 90px; display: block; }

/* ---------- Cards / Grid ---------- */
.grid { display: grid; gap: 1.5rem; }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card {
  background: #fff; border: 1px solid var(--linie); border-radius: var(--radius);
  padding: 2rem; box-shadow: var(--schatten); transition: transform .2s;
}
.card:hover { transform: translateY(-4px); }
.card .flag { font-size: 2rem; }
.card h3 { margin: .8rem 0 .4rem; }
.card p { font-size: .98rem; }
.card .tag { display:inline-block; margin-top: 1rem; font-size:.8rem; font-weight:600; color: var(--wasser); }

/* ---------- Prinzipien ---------- */
.principles { display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fit, minmax(240px,1fr)); margin-top: 2.5rem; }
.principle { display:flex; gap: .9rem; }
.principle .ico { font-size: 1.6rem; }
.principle h3 { font-size: 1.05rem; }
.principle p { font-size: .95rem; }

/* ---------- CTA band ---------- */
.cta {
  background: linear-gradient(120deg, var(--tief), var(--wasser));
  color:#fff; border-radius: var(--radius); padding: clamp(2.5rem,6vw,4rem);
  text-align:center;
}
.cta h2 { color:#fff; }
.cta p { color: rgba(255,255,255,.85); margin: 1rem auto 2rem; max-width: 50ch; }

/* ---------- Article (Textseiten) ---------- */
.article { max-width: 72ch; }
.article h2 { margin-top: 2.5rem; }
.article h3 { margin-top: 1.75rem; }
.article p, .article ul { margin-top: 1rem; }
.article ul { padding-left: 1.25rem; }
.article li { margin-top: .35rem; color:#33505f; }
.article blockquote {
  margin: 2rem 0; padding: 1rem 1.5rem; border-left: 4px solid var(--wasser);
  background: var(--hell); border-radius: 0 12px 12px 0; font-style: italic; color: var(--tief);
}

/* ---------- Formular ---------- */
.form { max-width: 560px; display: grid; gap: 1.1rem; }
.form label { font-weight: 600; font-size: .95rem; display:block; margin-bottom: .35rem; }
.form input, .form textarea {
  width: 100%; padding: .85rem 1rem; border: 1.5px solid var(--linie);
  border-radius: 12px; font: inherit; color: var(--tief); background: #fff;
}
.form input:focus, .form textarea:focus { outline: none; border-color: var(--wasser); box-shadow: 0 0 0 3px rgba(18,163,176,.15); }
.form textarea { min-height: 140px; resize: vertical; }

/* ---------- Footer ---------- */
.site-footer { background: var(--tief); color: rgba(255,255,255,.75); padding: 3.5rem 0 2rem; margin-top: 0; }
.footer-grid { display:grid; gap: 2rem; grid-template-columns: 1.4fr 1fr 1fr; }
.site-footer h4 { color:#fff; font-size: .95rem; margin-bottom: .9rem; letter-spacing:.02em; }
.site-footer a { color: rgba(255,255,255,.75); }
.site-footer a:hover { color: var(--wasser-2); }
.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: .45rem; }
.footer-bottom {
  margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,.12);
  display:flex; justify-content: space-between; gap:1rem; flex-wrap: wrap; font-size:.85rem;
}

/* ---------- Page header (Unterseiten) ---------- */
.page-hero { background: linear-gradient(160deg, var(--tief), var(--tief-2)); color:#fff; padding: clamp(3rem,8vw,5rem) 0 clamp(4rem,9vw,6rem); position:relative; overflow:hidden; }
.page-hero h1 { color:#fff; }
.page-hero .lead { color: rgba(255,255,255,.82); margin-top: .75rem; }

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
  .nav-links {
    position: absolute; top: 72px; left: 0; right: 0;
    background:#fff; flex-direction: column; gap: 0; padding: .5rem 1.25rem 1.25rem;
    border-bottom: 1px solid var(--linie); box-shadow: var(--schatten);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links li { width:100%; padding: .6rem 0; border-bottom:1px solid var(--linie); }
  .nav-toggle { display: block; }
  .footer-grid { grid-template-columns: 1fr; }
}