/* R+S Ingenieurbüro — Designsystem */
:root {
  /* Greens (default theme: tiefes Grün) */
  --bg: #f6f5f0;
  --bg-soft: #ecebe3;
  --bg-card: #ffffff;
  --ink: #14241c;
  --ink-soft: #3a4a42;
  --ink-mute: #6c7a72;
  --line: #d9d6c8;
  --line-soft: #e7e4d6;
  --brand: #1f4a36;        /* deep forest */
  --brand-deep: #14342a;
  --brand-soft: #2f6a4f;
  --accent: #c9b66a;       /* warm brass */
  --paper: #fbfaf4;

  --radius-sm: 4px;
  --radius: 6px;
  --radius-lg: 10px;

  --font-display: "Inter Tight", -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-sans: "Inter Tight", -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, Menlo, monospace;

  --maxw: 1240px;
  --gutter: clamp(20px, 4vw, 56px);
}

/* Theme: Anthrazit/Schwarz mit Goldakzent */
[data-theme="graphite"] {
  --bg: #f3f1ec;
  --bg-soft: #e6e3da;
  --bg-card: #ffffff;
  --ink: #15171a;
  --ink-soft: #2c2f33;
  --ink-mute: #6a6e73;
  --line: #d6d2c5;
  --line-soft: #e6e3d4;
  --brand: #1c1d20;
  --brand-deep: #0c0d0f;
  --brand-soft: #3a3c41;
  --accent: #c79b3c;
}

/* Theme: Petrol */
[data-theme="petrol"] {
  --bg: #f1f3f3;
  --bg-soft: #e2e7e7;
  --bg-card: #ffffff;
  --ink: #0e1f24;
  --ink-soft: #2b3f44;
  --ink-mute: #607278;
  --line: #cdd5d6;
  --line-soft: #dde4e4;
  --brand: #11464f;
  --brand-deep: #0a2f37;
  --brand-soft: #1f6873;
  --accent: #d8a657;
}

/* Theme: Sand */
[data-theme="sand"] {
  --bg: #f3eee4;
  --bg-soft: #e7dfcf;
  --bg-card: #fbf8f1;
  --ink: #1d1813;
  --ink-soft: #3b322a;
  --ink-mute: #76695b;
  --line: #d8cfba;
  --line-soft: #e6dfcc;
  --brand: #6b3b1f;
  --brand-deep: #4a2812;
  --brand-soft: #8e5530;
  --accent: #2e4a32;
}

/* Density */
[data-density="cozy"]  { --pad-section: clamp(72px, 9vw, 128px); }
[data-density="airy"]  { --pad-section: clamp(96px, 12vw, 180px); }
:root { --pad-section: clamp(96px, 12vw, 180px); }

/* base */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--ink);
  text-wrap: balance;
}
h1 { font-size: clamp(42px, 5.6vw, 80px); line-height: 1.03; letter-spacing: -0.035em; font-weight: 500; }
h2 { font-size: clamp(30px, 3.6vw, 52px); line-height: 1.08; letter-spacing: -0.028em; font-weight: 500; }
h3 { font-size: clamp(19px, 1.6vw, 24px); line-height: 1.25; letter-spacing: -0.015em; font-weight: 500; }
p  { text-wrap: pretty; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 24px; height: 1px;
  background: var(--ink-mute);
  display: inline-block;
}

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

section { padding: var(--pad-section) 0; }
section + section { border-top: 1px solid var(--line-soft); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 22px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.005em;
  background: var(--brand);
  color: var(--paper);
  border: 1px solid var(--brand);
  transition: background .25s ease, color .25s ease, transform .2s ease;
  cursor: pointer;
  font-family: inherit;
}
.btn:hover { background: var(--brand-deep); }
.btn .arrow { transition: transform .25s ease; }
.btn:hover .arrow { transform: translateX(4px); }
.btn.ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}
.btn.ghost:hover { background: var(--bg-soft); border-color: var(--ink-soft); }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  border-bottom: 1px solid var(--line-soft);
}
.site-header .row {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.brand-mark {
  display: inline-flex; align-items: baseline; gap: 2px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 22px;
  letter-spacing: -0.025em;
  color: var(--ink);
}
.brand-mark .plus { color: var(--brand); font-weight: 600; padding: 0 1px; }
.brand-mark .sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-left: 14px;
  padding-left: 14px;
  border-left: 1px solid var(--line);
  align-self: center;
}
nav.primary {
  display: flex; gap: 28px; align-items: center;
}
nav.primary a {
  font-size: 14px;
  color: var(--ink-soft);
  position: relative;
  padding: 6px 0;
  transition: color .2s ease;
}
nav.primary a:hover { color: var(--ink); }
nav.primary a.active { color: var(--ink); }
nav.primary a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: var(--brand);
}
.header-cta {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--ink);
  font-size: 13px;
  color: var(--ink);
  background: transparent;
  transition: background .2s, color .2s;
}
.header-cta:hover { background: var(--ink); color: var(--paper); }

/* Hero */
.hero {
  padding: clamp(64px, 9vw, 128px) 0 clamp(72px, 10vw, 160px);
  position: relative;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: clamp(32px, 6vw, 88px);
  align-items: end;
}
.hero h1 .accent { color: var(--brand); font-weight: 500; }
.hero-meta {
  display: flex; gap: 36px;
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  flex-wrap: wrap;
}
.hero-meta dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 6px;
}
.hero-meta dd { margin: 0; font-size: 15px; color: var(--ink); }

/* Placeholder image (subtle stripes) */
.ph {
  position: relative;
  background:
    repeating-linear-gradient(
      135deg,
      color-mix(in oklab, var(--brand) 7%, transparent) 0 1px,
      transparent 1px 8px
    ),
    var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  padding: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-mute);
  letter-spacing: 0.04em;
}
.ph::before {
  content: "";
  position: absolute;
  inset: 18px;
  border: 1px dashed color-mix(in oklab, var(--ink) 15%, transparent);
  pointer-events: none;
}
.ph .label {
  position: relative;
  background: var(--paper);
  padding: 4px 8px;
  border: 1px solid var(--line);
  border-radius: 3px;
}
.ph .ratio {
  position: relative;
  color: var(--ink-mute);
}

/* Service cards */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
.card-svc {
  background: var(--bg-card);
  padding: 40px 36px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-height: 320px;
  position: relative;
  transition: background .25s ease;
}
.card-svc:hover { background: var(--paper); }
.card-svc .num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink-mute);
}
.card-svc h3 { color: var(--ink); }
.card-svc p { color: var(--ink-soft); font-size: 15px; line-height: 1.55; }
.card-svc .icon-frame {
  width: 44px; height: 44px;
  border: 1px solid var(--line);
  border-radius: 4px;
  display: grid; place-items: center;
  color: var(--brand);
  margin-bottom: 4px;
}
.card-svc .more {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
  display: inline-flex; gap: 8px; align-items: center;
}
.card-svc:hover .more { color: var(--brand); }

/* Footer */
.site-footer {
  background: var(--brand-deep);
  color: color-mix(in oklab, var(--paper) 90%, transparent);
  padding: 96px 0 32px;
  margin-top: 0;
}
.site-footer h3 {
  color: var(--paper);
  font-family: var(--font-display);
  font-size: clamp(38px, 4.6vw, 64px);
  font-weight: 500;
  letter-spacing: -0.03em;
  margin-bottom: 56px;
  max-width: 800px;
  line-height: 1.08;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 48px;
  padding-top: 56px;
  border-top: 1px solid color-mix(in oklab, var(--paper) 15%, transparent);
}
.footer-grid h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: color-mix(in oklab, var(--paper) 60%, transparent);
  margin-bottom: 18px;
  font-weight: 400;
}
.footer-grid p, .footer-grid a {
  color: color-mix(in oklab, var(--paper) 88%, transparent);
  font-size: 15px;
  line-height: 1.6;
}
.footer-grid a:hover { color: var(--accent); }
.footer-bottom {
  display: flex; justify-content: space-between;
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid color-mix(in oklab, var(--paper) 10%, transparent);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: color-mix(in oklab, var(--paper) 55%, transparent);
}

/* Page intro (subpages) */
.page-intro {
  padding: clamp(80px, 10vw, 160px) 0 clamp(48px, 6vw, 88px);
}
.page-intro .crumbs {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 32px;
  display: flex; gap: 12px; align-items: center;
}
.page-intro .crumbs span { color: var(--brand); }
.page-intro .lead {
  font-size: clamp(18px, 1.5vw, 22px);
  color: var(--ink-soft);
  max-width: 720px;
  line-height: 1.5;
  margin-top: 32px;
  font-weight: 380;
}
.page-intro h1 { max-width: 14ch; }

/* Two-column section */
.split {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: clamp(40px, 6vw, 96px);
  align-items: start;
}
.split .stick {
  position: sticky;
  top: 100px;
}

/* Detail list */
.detail-list { list-style: none; padding: 0; margin: 0; }
.detail-list li {
  padding: 28px 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 50px 1fr;
  gap: 28px;
  align-items: start;
}
.detail-list li:last-child { border-bottom: 1px solid var(--line); }
.detail-list .num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.15em;
  color: var(--ink-mute);
  padding-top: 4px;
}
.detail-list h3 { margin-bottom: 8px; }
.detail-list p { color: var(--ink-soft); font-size: 15px; max-width: 60ch; }

/* Form */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px 32px;
}
.form-grid .full { grid-column: 1 / -1; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.field input, .field textarea, .field select {
  border: none;
  border-bottom: 1px solid var(--line);
  background: transparent;
  padding: 10px 0 14px;
  font: inherit;
  color: var(--ink);
  outline: none;
  transition: border-color .2s ease;
  font-size: 16px;
  border-radius: 0;
}
.field input:focus, .field textarea:focus, .field select:focus {
  border-color: var(--brand);
}
.field textarea { resize: vertical; min-height: 100px; }

/* Blog cards */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
.blog-card {
  background: var(--bg-card);
  padding: 36px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 280px;
  cursor: pointer;
  transition: background .25s ease;
}
.blog-card:hover { background: var(--paper); }
.blog-card .meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
  display: flex; gap: 20px;
}
.blog-card h3 { font-size: 26px; line-height: 1.18; }
.blog-card p { color: var(--ink-soft); font-size: 15px; }
.blog-card .read {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--brand);
}

/* Stats / numbers row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.stats-row .stat {
  background: var(--bg);
  padding: 32px 24px;
}
.stats-row .stat .num {
  font-family: var(--font-display);
  font-size: clamp(40px, 4.5vw, 64px);
  font-weight: 500;
  color: var(--brand);
  letter-spacing: -0.03em;
  line-height: 1;
}
.stats-row .stat .lbl {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-top: 12px;
}

/* Booking */
.calendar {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.calendar .day {
  background: var(--bg-card);
  padding: 14px 10px;
  text-align: center;
  font-size: 14px;
  cursor: pointer;
  transition: background .15s ease;
  position: relative;
  min-height: 56px;
}
.calendar .day:hover:not(.empty):not(.disabled) { background: var(--bg-soft); }
.calendar .day.empty { background: var(--bg-soft); cursor: default; }
.calendar .day.disabled { color: var(--ink-mute); cursor: not-allowed; opacity: 0.4; }
.calendar .day.selected { background: var(--brand); color: var(--paper); }
.calendar .day .dot {
  position: absolute;
  left: 50%; bottom: 6px;
  transform: translateX(-50%);
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--brand);
}
.calendar .day.selected .dot { background: var(--paper); }
.calendar .head {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
  background: var(--bg-soft);
  padding: 10px;
  text-align: center;
  cursor: default;
}
.slots {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 24px;
}
.slot {
  padding: 12px;
  border: 1px solid var(--line);
  background: var(--bg-card);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 13px;
  cursor: pointer;
  border-radius: 4px;
  transition: all .15s ease;
}
.slot:hover { border-color: var(--brand); }
.slot.selected { background: var(--brand); color: var(--paper); border-color: var(--brand); }

/* Tags */
.tag {
  display: inline-flex; align-items: center;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--brand);
  background: color-mix(in oklab, var(--brand) 8%, transparent);
  border-radius: 999px;
}

/* Consent banner */
.consent-overlay {
  position: fixed;
  left: 24px; bottom: 24px;
  z-index: 200;
  max-width: 480px;
  width: calc(100vw - 48px);
}
.consent-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 24px 60px -20px rgba(0,0,0,0.25), 0 4px 12px rgba(0,0,0,0.08);
  font-size: 14px;
}
.consent-header { margin-bottom: 16px; }
.consent-details {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  margin: 8px 0 20px;
  padding: 8px 0;
}
.consent-row {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 20px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
}
.consent-row:last-child { border-bottom: none; }
.consent-row strong { font-size: 14px; color: var(--ink); display: block; margin-bottom: 4px; font-weight: 500; }
.consent-row p { margin: 0; font-size: 13px; color: var(--ink-mute); line-height: 1.5; max-width: 320px; }
.consent-toggle {
  flex-shrink: 0;
  width: 40px; height: 22px;
  border-radius: 999px;
  background: var(--line);
  border: none;
  cursor: pointer;
  position: relative;
  transition: background .2s ease;
  padding: 0;
}
.consent-toggle span {
  position: absolute;
  top: 3px; left: 3px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--paper);
  transition: transform .2s ease;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
.consent-toggle.on { background: var(--brand); }
.consent-toggle.on span { transform: translateX(18px); }
.consent-toggle.disabled {
  width: auto; height: auto;
  padding: 4px 10px;
  background: var(--bg-soft);
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  cursor: default;
  border-radius: 4px;
}
.consent-actions {
  display: flex; gap: 10px; flex-wrap: wrap;
  margin-top: 4px;
}
.consent-actions .btn { padding: 11px 18px; font-size: 13px; }
@media (max-width: 600px) {
  .consent-overlay { left: 12px; right: 12px; bottom: 12px; width: auto; max-width: none; }
  .consent-card { padding: 20px; }
}

/* Footer link button (consent settings) */
.footer-link-btn {
  background: none;
  border: none;
  color: inherit;
  font: inherit;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: color-mix(in oklab, var(--paper) 30%, transparent);
}
.footer-link-btn:hover { color: var(--accent); }

/* Responsive */
@media (max-width: 900px) {
  .hero-grid, .split, .footer-grid, .form-grid { grid-template-columns: 1fr; }
  .cards-grid, .blog-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  nav.primary { display: none; }
  .header-cta { display: none; }
  .site-header .row { height: 60px; }
}