/* ==========================================================================
   Ingenieurbüro Hüpgen — Stylesheet
   Mobile-first. Breakpoints: <600px (Basis), 600px (Tablet), 1024px (Desktop)
   ========================================================================== */

@font-face {
  font-family: "IBM Plex Sans";
  src: url("../fonts/ibm-plex-sans-400.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("../fonts/ibm-plex-sans-500.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("../fonts/ibm-plex-sans-600.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("../fonts/ibm-plex-sans-700.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("../fonts/ibm-plex-mono-500.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

:root {
  --color-ink: #14161A;
  --color-ink-soft: #2B2E33;
  --color-steel: #666B6F;
  --color-steel-light: #B7BABC;
  --color-accent: #4F6B77;
  --color-accent-light: #8AACB7;
  --color-accent-deep: #37505A;
  --color-copper: #B8763F;
  --color-copper-light: #D2965F;
  --color-bg: #F6F5F2;
  --color-bg-alt: #EDECE7;
  --color-white: #FFFFFF;
  --color-border: #DDDBD4;

  --font-sans: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Menlo, monospace;

  --max-width: 1180px;
  --space-3xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  --space-2xl: 8rem;

  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;

  --shadow-sm: 0 1px 2px rgba(20,18,15,0.06), 0 2px 6px rgba(20,18,15,0.07);
  --shadow-md: 0 10px 28px rgba(20,18,15,0.12);
  --shadow-lg: 0 24px 48px rgba(20,18,15,0.16);

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --dur-fast: 150ms;
  --dur-normal: 250ms;
  --dur-slow: 450ms;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.62;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }

a {
  color: var(--color-ink);
  text-decoration-color: var(--color-accent);
  text-underline-offset: 3px;
}
a:hover { color: var(--color-accent); }

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.012em;
  margin: 0 0 var(--space-sm);
  color: var(--color-ink);
}
h1, h2 { line-height: 1.1; }
h1 { font-size: clamp(2.25rem, 5vw, 3rem); }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.35rem); }
h3 { font-size: 1.15rem; font-weight: 600; letter-spacing: -0.005em; }
p { margin: 0 0 var(--space-sm); }

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-sm);
}

.kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.section {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--color-border);
}
.section--alt { background: var(--color-bg-alt); }
.section--tight { padding: var(--space-lg) 0; }
.section-head { max-width: 640px; margin-bottom: var(--space-lg); }
.section-head p { color: var(--color-steel); }

/* ---------- Header ---------- */
.site-header {
  background: var(--color-ink);
  color: var(--color-white);
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.site-header .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.65rem;
  padding-bottom: 0.65rem;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--color-white);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
  text-decoration: none;
}
.logo:hover { color: var(--color-white); }
.logo-wide-img {
  height: 26px;
  width: auto;
  display: block;
}

.nav-toggle {
  display: inline-flex;
  background: none;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: var(--radius-md);
  color: var(--color-white);
  padding: 0.4rem 0.6rem;
  font-size: 0.9rem;
  cursor: pointer;
  transition: border-color var(--dur-fast) var(--ease-out-quart);
}
.nav-toggle:hover { border-color: rgba(255,255,255,0.6); }

.main-nav {
  display: none;
  flex-direction: column;
  flex-basis: 100%;
  gap: 0;
  border-top: 1px solid rgba(255,255,255,0.15);
}
.main-nav.is-open { display: flex; }
.main-nav a {
  color: var(--color-white);
  display: block;
  padding: 0.85rem var(--space-sm);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color var(--dur-fast) var(--ease-out-quart), background-color var(--dur-fast) var(--ease-out-quart);
}
.main-nav a:hover { background: rgba(255,255,255,0.06); color: var(--color-accent-light); }
.main-nav .nav-cta {
  color: var(--color-accent-light);
  font-family: var(--font-mono);
  font-weight: 500;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.9rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
  font-size: 1rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out-quart),
              box-shadow var(--dur-fast) var(--ease-out-quart),
              background-color var(--dur-fast) var(--ease-out-quart),
              border-color var(--dur-fast) var(--ease-out-quart);
}
.btn--primary {
  background: var(--color-accent);
  color: var(--color-white);
}
.btn--primary:hover {
  background: var(--color-accent-deep);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn--primary:active { transform: translateY(0) scale(0.98); transition-duration: 100ms; }
.btn--ghost {
  background: transparent;
  border-color: var(--color-ink);
  color: var(--color-ink);
}
.btn--ghost:hover { background: var(--color-ink); color: var(--color-white); transform: translateY(-2px); }
.btn--ghost-light {
  background: transparent;
  border-color: rgba(255,255,255,0.4);
  color: var(--color-white);
}
.btn--ghost-light:hover { background: rgba(255,255,255,0.1); color: var(--color-white); border-color: rgba(255,255,255,0.7); transform: translateY(-2px); }

/* ---------- Hero (full-bleed) ---------- */
.hero {
  background: var(--color-ink);
  color: var(--color-white);
  position: relative;
  overflow: hidden;
  min-height: 88vh;
  display: flex;
  align-items: center;
}
.hero-bg-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(14,15,18,0.97) 0%, rgba(14,15,18,0.92) 32%, rgba(14,15,18,0.62) 62%, rgba(14,15,18,0.28) 100%);
  z-index: 1;
}
.hero-inner {
  padding-top: var(--space-xl);
  padding-bottom: var(--space-xl);
  position: relative;
  z-index: 2;
}
.hero-copy { max-width: 660px; }
.hero-copy .kicker { color: var(--color-accent-light); }
.hero-copy h1 {
  color: var(--color-white);
  font-size: clamp(3rem, 7.5vw, 5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.hero-copy .lede {
  font-size: 1.2rem;
  color: rgba(255,255,255,0.86);
  max-width: 560px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  align-items: center;
  margin-top: var(--space-lg);
}
.hero-photo-tag {
  position: absolute;
  right: var(--space-sm);
  bottom: var(--space-sm);
  z-index: 2;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.85);
  background: rgba(20,22,26,0.5);
  backdrop-filter: blur(2px);
  padding: 0.4rem 0.7rem;
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: var(--radius-sm);
}

.trust-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255,255,255,0.14);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.01em;
  color: rgba(255,255,255,0.7);
}
.trust-bar span { display: inline-flex; align-items: center; gap: 0.45rem; }
.trust-bar span::before {
  content: "\2713";
  color: var(--color-accent-light);
  font-weight: 600;
}

.portrait-photo {
  width: 100%;
  height: auto;
  max-width: 320px;
  aspect-ratio: 3/4;
  object-fit: cover;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  margin: 0 auto;
}

/* ---------- Leistung: numbered steps ---------- */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-md);
}
.step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-sm);
  align-items: start;
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  transition: transform var(--dur-normal) var(--ease-out-quart);
}
.step:last-child { border-bottom: none; padding-bottom: 0; }
.step-num {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  line-height: 1;
  padding-right: var(--space-sm);
  border-right: 1px solid var(--color-border);
  transition: color var(--dur-normal) var(--ease-out-quart);
}
.step:hover { transform: translateX(6px); }
.step:hover .step-num { color: var(--color-copper); }
.step h3 { margin-bottom: 0.35rem; }
.step p { color: var(--color-steel); margin-bottom: 0; }

.callout {
  margin-top: var(--space-lg);
  padding: var(--space-md);
  background: var(--color-white);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  box-shadow: var(--shadow-sm);
  font-size: 0.97rem;
}

/* ---------- Qualifikation: vertical list ---------- */
.quali-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-border);
}
.quali-list li {
  position: relative;
  padding: 1.15rem 0 1.15rem 1.85rem;
  border-bottom: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.2rem;
  transition: transform var(--dur-normal) var(--ease-out-quart), background-color var(--dur-normal) var(--ease-out-quart);
}
.quali-list .quali-icon {
  position: absolute;
  left: 0;
  top: 1.25rem;
  display: inline-flex;
  color: var(--color-copper);
  transition: color var(--dur-fast) var(--ease-out-quart);
}
.quali-list li:hover { transform: translateX(6px); }
.quali-list .quali-title { font-weight: 600; color: var(--color-ink); }
.quali-list .quali-sub { color: var(--color-steel); font-size: 0.92rem; }
.quali-note {
  margin-top: var(--space-sm);
  font-size: 0.9rem;
  color: var(--color-steel);
  font-style: italic;
}

/* ---------- Warum Hüpgen: oversized stat blocks ---------- */
.why-grid {
  display: grid;
  gap: var(--space-lg) var(--space-md);
}
.why-fact-block { padding-top: var(--space-sm); }
.why-fact {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(2.75rem, 6vw, 4.25rem);
  color: var(--color-ink);
  font-weight: 500;
  line-height: 1;
  padding-bottom: 0.55rem;
  margin-bottom: 0.75rem;
  border-bottom: 3px solid var(--color-copper);
}
.why-fact-block p { color: var(--color-steel); max-width: 32ch; }

/* ---------- Full-bleed breathing section ---------- */
.full-bleed {
  position: relative;
  min-height: 340px;
  display: flex;
  align-items: center;
  color: var(--color-white);
  background: var(--color-ink);
  overflow: hidden;
  padding: var(--space-xl) 0;
}
.full-bleed-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
}
.full-bleed::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(20,22,26,0.92) 20%, rgba(20,22,26,0.55) 100%);
}
.full-bleed .container { position: relative; z-index: 1; }
.full-bleed-line {
  font-size: clamp(1.6rem, 3.6vw, 2.5rem);
  font-weight: 700;
  line-height: 1.28;
  max-width: 760px;
  margin: 0;
  letter-spacing: -0.01em;
}
.full-bleed-line em {
  font-style: normal;
  color: var(--color-accent-light);
}

/* ---------- Two offers: Energieaudit vs. PeakGuard ---------- */
.offer-grid {
  display: grid;
  gap: var(--space-md);
}
.offer-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: var(--shadow-sm);
}
.offer-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(184,118,63,0.12);
  color: var(--color-copper);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-sm);
}
.offer-card h3 { margin-bottom: var(--space-xs); }
.offer-card p { color: var(--color-steel); margin-bottom: var(--space-md); }
.offer-card .btn { margin-top: auto; }

/* ---------- Contact form ---------- */
.contact-layout {
  display: grid;
  gap: var(--space-lg);
}
.contact-info h2 { margin-bottom: var(--space-sm); }
.contact-phone-big {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 1.7rem;
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: 2px solid var(--color-copper);
  padding-bottom: 0.15rem;
  margin: var(--space-xs) 0 var(--space-md);
}
.contact-detail { margin-bottom: 0.3rem; color: var(--color-steel); }

form.contact-form {
  display: grid;
  gap: var(--space-sm);
  background: var(--color-white);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}
.form-row { display: grid; gap: var(--space-sm); }
.form-field { display: flex; flex-direction: column; gap: 0.35rem; }
.form-field label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-ink);
}
.form-field input,
.form-field textarea {
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-ink);
  transition: border-color var(--dur-fast) var(--ease-out-quart), background-color var(--dur-fast) var(--ease-out-quart);
}
.form-field input:focus,
.form-field textarea:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
  background: var(--color-white);
}
.form-field textarea { resize: vertical; min-height: 120px; }
.form-consent {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.88rem;
  color: var(--color-steel);
}
.form-consent input { margin-top: 0.25rem; }
.form-honeypot { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-status {
  padding: 0.8rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  display: none;
  background: var(--color-bg-alt);
  color: var(--color-ink);
  border-left: 3px solid var(--color-accent);
}
.form-status.is-visible { display: block; }
.form-status--success { border-left-color: var(--color-accent); }
.form-status--error { border-left-color: var(--color-copper); font-weight: 600; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-ink);
  color: rgba(255,255,255,0.75);
  padding: var(--space-md) 0;
  font-size: 0.9rem;
}
.footer-grid {
  display: grid;
  gap: var(--space-md);
}
.footer-grid a { color: rgba(255,255,255,0.85); text-decoration: none; }
.footer-grid a:hover { color: var(--color-accent-light); }
.footer-links { display: flex; flex-wrap: wrap; gap: 0.4rem 1rem; list-style: none; padding: 0; margin: 0; }
.footer-bottom {
  margin-top: var(--space-md);
  padding-top: var(--space-sm);
  border-top: 1px solid rgba(255,255,255,0.12);
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
}

/* ---------- Sub-page hero (simple page header) ---------- */
.page-header {
  background: var(--color-ink);
  color: var(--color-white);
  padding: var(--space-xl) 0 var(--space-lg);
}
.page-header h1 { color: var(--color-white); font-size: clamp(2rem, 4.5vw, 2.75rem); }
.page-header .kicker { color: var(--color-accent-light); }

.pull-quote {
  font-size: clamp(1.4rem, 2.8vw, 1.9rem);
  font-weight: 700;
  font-style: italic;
  color: var(--color-ink);
  line-height: 1.35;
  margin: var(--space-lg) 0;
  padding-left: var(--space-md);
  border-left: 3px solid var(--color-copper);
  max-width: 620px;
}

.legal-content h2 { margin-top: var(--space-md); }
.legal-content h2:first-child { margin-top: 0; }
.legal-content p, .legal-content li { color: var(--color-ink); }
.legal-content ul { padding-left: 1.2rem; }

/* ---------- Motion: scroll reveal + hero load sequence ----------
   Hidden states only apply once JS confirms IntersectionObserver
   support and no reduced-motion preference (see main.js, .has-motion
   on <html>). Without JS, everything stays visible by default. */
.has-motion .section {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--dur-slow) var(--ease-out-expo), transform var(--dur-slow) var(--ease-out-expo);
}
.has-motion .section.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.has-motion .quali-list li {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 400ms var(--ease-out-expo), transform 400ms var(--ease-out-expo);
}
.has-motion .quali-list li.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.has-motion .offer-card {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 400ms var(--ease-out-expo), transform 400ms var(--ease-out-expo);
}
.has-motion .offer-card.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.has-motion .hero-copy .kicker,
.has-motion .hero-copy h1,
.has-motion .hero-copy .lede,
.has-motion .hero-actions,
.has-motion .trust-bar {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 400ms var(--ease-out-expo), transform 400ms var(--ease-out-expo);
}
.has-motion .hero-copy .kicker.is-visible,
.has-motion .hero-copy h1.is-visible,
.has-motion .hero-copy .lede.is-visible,
.has-motion .hero-actions.is-visible,
.has-motion .trust-bar.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .section,
  .quali-list li,
  .offer-card,
  .hero-copy .kicker,
  .hero-copy h1,
  .hero-copy .lede,
  .hero-actions,
  .trust-bar,
  .step,
  .btn {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* ==========================================================================
   Tablet: 600px+
   ========================================================================== */
@media (min-width: 600px) {
  .nav-toggle { display: none; }
  .main-nav {
    display: flex;
    flex-direction: row;
    flex-basis: auto;
    border-top: none;
    gap: 0.25rem;
  }
  .main-nav a {
    border-bottom: none;
    padding: 0.5rem 0.85rem;
  }

  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .offer-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}

/* ==========================================================================
   Desktop: 1024px+
   ========================================================================== */
@media (min-width: 1024px) {
  .steps { grid-template-columns: 1fr; }
  .step { grid-template-columns: 100px 1fr; }
  .why-grid { grid-template-columns: repeat(4, 1fr); gap: var(--space-lg) var(--space-md); }
  .why-fact-block:not(:first-child) { border-left: 1px solid var(--color-border); padding-left: var(--space-md); }
  .contact-layout { grid-template-columns: 1fr 1.3fr; align-items: start; }
  .quali-list li { grid-template-columns: 1fr 2fr; align-items: baseline; }
}