/* ============================================================
   Kelcon Engineering & Consulting GmbH — Website Stylesheet
   Bright modern style · DE/EN bilingual static site
   ============================================================ */

:root {
  --c-primary: #17456e;
  --c-primary-dark: #0e3155;
  --c-primary-tint: #eaf1f8;
  --c-accent: #e87722;
  --c-accent-dark: #cf6312;
  --c-text: #22303c;
  --c-muted: #5b6b7a;
  --c-bg-light: #f4f6f9;
  --c-border: #e3e8ee;
  --c-white: #ffffff;
  --radius: 10px;
  --shadow: 0 2px 10px rgba(14, 49, 85, 0.08);
  --shadow-hover: 0 10px 28px rgba(14, 49, 85, 0.14);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  color: var(--c-text);
  background: var(--c-white);
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--c-primary); text-decoration: none; }
a:hover { color: var(--c-accent); }

.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-white);
  border-bottom: 1px solid var(--c-border);
  transition: box-shadow 0.25s ease;
}
.site-header.scrolled { box-shadow: var(--shadow); }

.header-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 76px;
}

.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand-mark {
  width: 42px; height: 42px;
  background: var(--c-primary);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.brand-mark svg { width: 24px; height: 24px; }
.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--c-primary-dark);
  line-height: 1.1;
  white-space: nowrap;
}
.brand-sub {
  display: block;
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-muted);
  white-space: nowrap;
}

.main-nav { margin-left: auto; }
.main-nav ul { list-style: none; display: flex; gap: 4px; align-items: center; }
.main-nav a {
  display: block;
  padding: 8px 12px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--c-text);
  border-radius: 6px;
  white-space: nowrap;
}
.main-nav a:hover { color: var(--c-primary); background: var(--c-primary-tint); }
.main-nav a.active { color: var(--c-accent); }

.header-actions { display: flex; align-items: center; gap: 14px; flex-shrink: 0; }
.header-actions .btn { padding: 9px 18px; font-size: 0.86rem; }

.lang-switch {
  display: flex;
  border: 1px solid var(--c-border);
  border-radius: 6px;
  overflow: hidden;
  flex-shrink: 0;
}
.lang-switch a {
  padding: 6px 10px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--c-muted);
  white-space: nowrap;
}
.lang-switch a.active { background: var(--c-primary); color: #fff; }
.lang-switch a:not(.active):hover { color: var(--c-primary); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--c-border);
  border-radius: 6px;
  padding: 8px 10px;
  cursor: pointer;
}
.nav-toggle svg { width: 22px; height: 22px; display: block; stroke: var(--c-primary); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 700;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}
.btn-primary { background: var(--c-accent); color: #fff; }
.btn-primary:hover { background: var(--c-accent-dark); color: #fff; }
.btn-outline { border-color: #fff; color: #fff; }
.btn-outline:hover { background: #fff; color: var(--c-primary-dark); }
.btn-dark { background: var(--c-primary); color: #fff; }
.btn-dark:hover { background: var(--c-primary-dark); color: #fff; }

/* ---------- Hero (home) ---------- */
.hero {
  position: relative;
  background: var(--c-primary-dark);
  color: #fff;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background-size: cover;
  background-position: center;
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(100deg, rgba(10, 32, 54, 0.82) 0%, rgba(10, 32, 54, 0.55) 55%, rgba(10, 32, 54, 0.25) 100%);
}
.hero-content {
  position: relative;
  padding: 130px 0 150px;
  max-width: 720px;
}
.hero-kicker {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #ffb46e;
  margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(2rem, 4.2vw, 3.1rem);
  line-height: 1.15;
  font-weight: 800;
  margin-bottom: 22px;
}
.hero p {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 34px;
  max-width: 620px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* ---------- Page hero (inner pages) ---------- */
.page-hero {
  position: relative;
  background: var(--c-primary-dark);
  color: #fff;
  overflow: hidden;
}
.page-hero .hero-bg { opacity: 0.35; }
.page-hero .hero-overlay {
  background: linear-gradient(120deg, rgba(10, 32, 54, 0.92), rgba(14, 49, 85, 0.72));
}
.page-hero-content {
  position: relative;
  padding: 84px 0 74px;
  max-width: 780px;
}
.breadcrumb {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.72);
  margin-bottom: 14px;
}
.breadcrumb a { color: rgba(255, 255, 255, 0.72); }
.breadcrumb a:hover { color: #ffb46e; }
.page-hero h1 {
  font-size: clamp(1.8rem, 3.6vw, 2.6rem);
  font-weight: 800;
  line-height: 1.2;
}
.page-hero .lead {
  margin-top: 16px;
  font-size: 1.08rem;
  color: rgba(255, 255, 255, 0.88);
  max-width: 680px;
}

/* ---------- Sections ---------- */
.section { padding: 84px 0; }
.section-light { background: var(--c-bg-light); }
.section-head { max-width: 760px; margin-bottom: 48px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 12px;
}
.section-head h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--c-primary-dark);
  line-height: 1.25;
  margin-bottom: 14px;
}
.section-head p { color: var(--c-muted); font-size: 1.05rem; }

/* ---------- Feature split (image + text) ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split img { border-radius: var(--radius); box-shadow: var(--shadow-hover); object-fit: cover; width: 100%; }
.split h2 {
  font-size: clamp(1.5rem, 2.8vw, 2rem);
  color: var(--c-primary-dark);
  font-weight: 800;
  margin-bottom: 16px;
}
.split p { color: var(--c-muted); margin-bottom: 14px; }

.checklist { list-style: none; margin-top: 22px; }
.checklist li {
  position: relative;
  padding-left: 34px;
  margin-bottom: 12px;
  color: var(--c-text);
}
.checklist li::before {
  content: "";
  position: absolute; left: 0; top: 4px;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--c-primary-tint);
}
.checklist li::after {
  content: "";
  position: absolute; left: 6px; top: 10px;
  width: 9px; height: 5px;
  border-left: 2.5px solid var(--c-primary);
  border-bottom: 2.5px solid var(--c-primary);
  transform: rotate(-45deg);
}
.job-list, .job-bullets { margin: 18px 0 0 22px; color: var(--c-text); }
.job-list li, .job-bullets li { margin-bottom: 10px; padding-left: 5px; }
.job-list li:last-child, .job-bullets li:last-child { margin-bottom: 0; }
.job-note { color: var(--c-muted); font-size: 0.92rem; margin-top: 12px; }

/* ---------- Cards / service grid ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }

.card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 30px 28px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.card .icon-box {
  width: 52px; height: 52px;
  border-radius: 10px;
  background: var(--c-primary-tint);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
}
.card .icon-box svg { width: 28px; height: 28px; stroke: var(--c-primary); }
.card h3 { font-size: 1.08rem; font-weight: 700; color: var(--c-primary-dark); margin-bottom: 10px; }
.card p { font-size: 0.95rem; color: var(--c-muted); }
.card .more {
  display: inline-block;
  margin-top: 14px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--c-accent);
}
.card .more:hover { color: var(--c-accent-dark); }

/* ---------- Industries strip ---------- */
.industry-strip { display: flex; flex-wrap: wrap; gap: 12px; }
.industry-chip {
  padding: 10px 20px;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--c-primary-dark);
}

/* ---------- Timeline (digitalization) ---------- */
.timeline { position: relative; max-width: 820px; margin: 0 auto; }
.timeline::before {
  content: "";
  position: absolute; left: 25px; top: 8px; bottom: 8px;
  width: 3px;
  background: var(--c-border);
}
.timeline-item { position: relative; padding: 0 0 40px 76px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-num {
  position: absolute; left: 0; top: 0;
  width: 52px; height: 52px;
  border-radius: 50%;
  background: var(--c-primary);
  color: #fff;
  font-weight: 800;
  font-size: 1.15rem;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 0 6px var(--c-primary-tint);
}
.timeline-item h3 { font-size: 1.15rem; font-weight: 700; color: var(--c-primary-dark); margin-bottom: 8px; }
.timeline-item p { color: var(--c-muted); }

/* ---------- Info note ---------- */
.note {
  background: var(--c-primary-tint);
  border-left: 4px solid var(--c-primary);
  border-radius: 0 8px 8px 0;
  padding: 20px 24px;
  color: var(--c-primary-dark);
  font-size: 0.96rem;
  margin-top: 36px;
}

/* ---------- Data table (registry info) ---------- */
.data-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.data-table th, .data-table td {
  text-align: left;
  padding: 14px 20px;
  border-bottom: 1px solid var(--c-border);
  font-size: 0.95rem;
  vertical-align: top;
}
.data-table th { background: var(--c-bg-light); color: var(--c-primary-dark); font-weight: 700; width: 38%; }
.data-table tr:last-child td { border-bottom: none; }

/* ---------- CTA band ---------- */
.cta-band { background: var(--c-primary); color: #fff; padding: 72px 0; }
.cta-band h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 800; margin-bottom: 12px; }
.cta-band p { color: rgba(255, 255, 255, 0.88); max-width: 640px; margin-bottom: 28px; }
.cta-band .btn-outline { border-color: #fff; }
.cta-band .btn-outline:hover { background: #fff; color: var(--c-primary); }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr; gap: 40px; align-items: start; }
.contact-card {
  background: var(--c-primary-dark);
  color: #fff;
  border-radius: var(--radius);
  padding: 36px 32px;
}
.contact-card h3 { font-size: 1.2rem; font-weight: 800; margin-bottom: 20px; }
.contact-card .row { margin-bottom: 18px; }
.contact-card .label { font-size: 0.74rem; letter-spacing: 0.12em; text-transform: uppercase; color: rgba(255,255,255,0.6); font-weight: 700; margin-bottom: 3px; }
.contact-card .value { font-size: 0.98rem; line-height: 1.5; }
.contact-card a { color: #ffb46e; }

.form-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 36px 32px;
  box-shadow: var(--shadow);
}
.form-card h3 { font-size: 1.2rem; font-weight: 800; color: var(--c-primary-dark); margin-bottom: 22px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-field { display: flex; flex-direction: column; }
.form-field.full { grid-column: 1 / -1; }
.form-field label { font-size: 0.86rem; font-weight: 700; color: var(--c-primary-dark); margin-bottom: 6px; }
.form-field label .req { color: var(--c-accent); }
.form-field input, .form-field select, .form-field textarea {
  font-family: var(--font);
  font-size: 0.95rem;
  padding: 11px 14px;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  background: var(--c-bg-light);
  color: var(--c-text);
  transition: border-color 0.15s ease;
}
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  outline: none;
  border-color: var(--c-primary);
  background: #fff;
}
.form-field textarea { min-height: 120px; resize: vertical; }
.consent { grid-column: 1 / -1; display: flex; gap: 10px; align-items: flex-start; font-size: 0.86rem; color: var(--c-muted); }
.consent input { margin-top: 4px; }
.form-status { display: none; margin-top: 16px; padding: 14px 18px; border-radius: 8px; font-size: 0.92rem; }
.form-status.show { display: block; }
.form-status.info { background: var(--c-primary-tint); color: var(--c-primary-dark); }

/* ---------- Footer ---------- */
.site-footer { background: #0b2440; color: rgba(255, 255, 255, 0.82); padding: 64px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1.2fr; gap: 48px; padding-bottom: 44px; }
.footer-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.footer-brand .brand-name { color: #fff; }
.footer-brand .brand-sub { color: rgba(255, 255, 255, 0.55); }
.site-footer h4 {
  color: #fff;
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 18px;
  font-weight: 700;
}
.site-footer p { font-size: 0.92rem; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { color: rgba(255, 255, 255, 0.82); font-size: 0.94rem; }
.footer-links a:hover { color: #ffb46e; }
.footer-legal { font-size: 0.84rem; line-height: 1.7; color: rgba(255, 255, 255, 0.65); }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.84rem;
  color: rgba(255, 255, 255, 0.55);
}
.footer-bottom-links { display: flex; gap: 22px; }
.footer-bottom-links a { color: rgba(255, 255, 255, 0.7); }
.footer-bottom-links a:hover { color: #ffb46e; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1500px) {
  .main-nav a { padding: 8px 9px; font-size: 0.85rem; }
  .brand-sub { font-size: 0.6rem; letter-spacing: 0.1em; }
  .header-inner { gap: 18px; min-height: 68px; }
}
@media (max-width: 1280px) {
  .main-nav a { padding: 7px 7px; font-size: 0.8rem; }
  .brand-name { font-size: 1.1rem; }
  .brand-mark { width: 38px; height: 38px; }
  .header-actions { gap: 10px; }
  .header-actions .btn { padding: 8px 14px; font-size: 0.8rem; }
}
@media (max-width: 1150px) {
  .brand-sub { display: none; }
  .main-nav a { padding: 7px 6px; font-size: 0.78rem; }
  .header-actions .btn { padding: 8px 12px; font-size: 0.76rem; }
}
@media (max-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; gap: 36px; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  .nav-toggle { display: block; margin-left: auto; }
  .header-actions .lang-switch { order: -1; }
  .main-nav {
    display: none;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--c-border);
    box-shadow: var(--shadow-hover);
    padding: 12px 24px 20px;
  }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; align-items: stretch; gap: 2px; }
  .main-nav a { padding: 12px 10px; }
  .header-actions { margin-left: auto; }
  .header-actions .btn { display: none; }
}

@media (max-width: 640px) {
  .grid-3, .grid-2, .form-grid, .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 60px 0; }
  .hero-content { padding: 90px 0 110px; }
  .timeline-item { padding-left: 64px; }
  .timeline-num { width: 44px; height: 44px; font-size: 1rem; }
  .timeline::before { left: 21px; }
}