:root {
  /* Light Theme Palette */
  --bg-color: #fdfbf7;
  --surface-color: #ffffff;
  --text-color: #2b2523;
  --text-muted: #6e655f;
  --border-color: #e6dfd5;

  /* Chocolate Brown Accent Palette */
  --primary: #5c3a21;
  --primary-hover: #422917;
  --primary-light: #f3ece4;
  --accent: #8c532b;

  --shadow: 0 4px 20px rgba(92, 58, 33, 0.08);
  --transition: all 0.3s ease;
}

[data-theme="dark"] {
  /* Dark Theme Palette */
  --bg-color: #1a1614;
  --surface-color: #241f1c;
  --text-color: #f5efe9;
  --text-muted: #b5a89e;
  --border-color: #3d342f;

  --primary: #a66e4e;
  --primary-hover: #bf8360;
  --primary-light: #2e241e;
  --accent: #d9936a;

  --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

html,
body {
  scroll-behavior: smooth;
}

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

body {
  font-family: Montserrat, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

/* Sticky Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
  gap: 2rem;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  height: 36px;
  width: auto;
  display: block;
  object-fit: contain;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
  justify-content: space-around;
  flex: 1;
}

.nav-link {
  font-weight: 500;
  color: var(--text-color);
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--accent);
}

.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
}

.btn-outline {
  border: 1px solid var(--primary);
  color: var(--primary);
  background: transparent;
}

.btn-outline:hover {
  background-color: var(--primary-light);
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

/* x+ style  */
.xplus {
  letter-spacing: -.2rem;
  font-style: italic;
}

.xplus::after {
  content: " ";
  letter-spacing: normal;
}

/* Theme Toggle Button */
.theme-toggle {
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Mobile Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
}

/* hamburger  */
.bar {
  width: 25px;
  height: 3px;
  background-color: var(--text-color);
  border-radius: 2px;
  transition: var(--transition);
}

/* Hero Section */
.hero {
  padding: 80px 0;
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.hero-title {
  font-size: 3rem;
  line-height: 1.2;
  margin-bottom: 20px;
  margin-top: 20px;
  color: var(--primary);
}

.hero-subtitle{
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: 30px;
}

.hero-preview-img {
  width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
}

.xplus-logo-img {
  width: 100%;
  height: auto;
}

/* Features Section */
.features {
  padding: 80px 0;
  background-color: var(--surface-color);
}

.section-title {
  font-size: 2.2rem;
  text-align: center;
}

.section-subtitle {
  margin-bottom: 40px;
  text-align: center;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.feature-card {
  padding: 30px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-color);
  transition: var(--transition);
  display: grid;
  grid-template-rows: subgrid;
  grid-row: span 3;
}

.feature-icons {
  display: flex;
  justify-content: space-around;
  overflow: hidden;
}

.feature-icons img {
  display: block;
  height: 48px;
  width: 48px;
  object-fit: contain;
}

.feature-card:hover,
.preview-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-color: var(--accent);
}

.feature-card h3 {
  color: var(--accent);
}


#setupsheets, #electrode-reports, 
#fixture-management, #flowto5axis {
  background: linear-gradient(var(--bg-color), var(--surface-color));
  scroll-margin-top: 60px;
}

/* feature section  */
.feature-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  border: var(--border-color);
  padding: 80px 0px;
  align-items: center;
  gap: 2rem;
  position: relative;
}

.reverse{
  order:2;
}

.feature-section h2 {
  line-height: 1.3;
  margin-bottom: 1.5rem;
  color: var(--primary);
}

.feature-section p {
  color: var(--text-muted);
}

.feature-section ul {
  padding-left: 2.5rem;
  color: var(--text-muted);
}

.badge {
  display: inline-block;
  background-color: var(--accent);
  color: var(--primary-light);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.85rem;
  margin-bottom: 2rem;
  font-size: larger;
}

.feature-preview {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: .5rem;
}

.feature-preview img {
  object-fit: contain;
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 6px;
}



/* preview-section  */
.preview-section {
  padding: 1.5rem 0;
  background-color: var(--surface-color);
  padding-bottom: 4rem;
}

.preview-section h3,
.preview-section p {
  text-align: center;
}

.preview-section-grid {
  color: var(--text-muted);
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  grid-template-rows: auto auto;
  gap: 2rem;
  padding-top: 2rem;
}

.preview-card {
  padding: 10px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-color);
  transition: var(--transition);
  display: grid;
  grid-template-rows: subgrid;
  grid-row: span 2;
  gap: 1rem;
  place-items: center center;
}

.preview-card img {
  max-width: 100%;
  max-height: 300px;
  height: auto;
  width: auto;
  object-fit: contain;
  border-radius: 6px;
}

.foot-note {
  font-size: smaller;
  padding: 12px;
}

#preview-popover:popover-open {
  position: fixed;
  inset: 0;
  display: grid;
  margin: auto;
  place-items: center center;
  border-radius: 10px;
  border:2px solid var(--border-color);
  background-color: var(--bg-color);
  color: var(--text-muted);
}

[popover]:popover-open::backdrop {
  background-color: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
}

#img-popover {
  width: auto;
  height: auto;
  max-width: calc(100vw - 4rem);
  max-height: calc(100vh - 6rem);
  object-fit: contain;
  display: block;
}


/* more features section  */
.more-features{
  margin-bottom: 2rem;
}
.more-features li{
  margin-bottom: 1rem;
}

.more-features li p {
  font-size: 1.2rem;
}

/* Footer */
footer {
  padding: 40px 0;
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-page {
  display: grid;
}

.footer-nav-menu {
  display: flex;
  justify-content: center;
  gap: 24px;
}

.footer-nav-menu a {
  font-weight: 500;
  color: var(--text-color);
  transition: var(--transition);
}

.footer-nav-menu a:hover,
.footer-nav-menu a.active {
  color: var(--accent);
}




/* impressum section  */
.doc-section {
  background-color: var(--bg-color);
  color: var(--text-color);
  margin-block: 4rem;
}

.doc-section h2 {
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.doc-section p {
  margin-bottom: 1rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  place-items: center start;
  margin-block: 2rem;
  column-gap: 2rem;
}

ul.nolist {
  list-style-type: none;
}

.counter-h2 {
  counter-reset: h2;
}

.counter-h2 h2:before {
  counter-increment: h2;
  content: counter(h2) ") ";
}

/* contact section  */
.contact-section {
  display: grid;
}

/* contact form  */
.contact-section{
  max-width: 900px;
  margin:auto;
  padding-block: 4rem;
  padding-inline: 1rem;
}

.contact-form a{
  text-decoration:underline;
}
.contact-form a:hover{
  color:var(--accent);
}

.contact-form {
  display: grid;
  gap: 15px;
  margin: 0 auto;
}

.contact-form fieldset {
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 2rem;
  padding-block: 1rem;
}
.contact-form fieldset legend{
  padding-inline: 1rem;
}
.contact-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(24rem, 1fr));
  gap: 1rem;
}

.form-group {
  display: grid;
  grid-template-columns: 6rem 1fr;
  gap: 0.5rem;
}

.form-group label {
  text-align: right;
}

.contact-form  input,
.contact-form  textarea,
.contact-form select,
.download-xplus select {
  border: 1px solid var(--border-color);
  border-radius: 5px;
  color: var(--text-color);
  padding-inline: 5px;
  background-color: var(--surface-color);
}

.contact-form input:focus,
.contact-form textarea:focus,
.contact-form select:focus,
.download-xplus select:focus{
  outline: 1px solid var(--accent);
}

.contact-form input[type="checkbox"]:focus{
  outline:none;
}

.contact-form input:valid {
  border-left: 4px solid green;
}

.contact-form input:invalid {
  border-left: 4px solid red;
}

.accordion {
  grid-column: 1/-1;
  position: relative;
  isolation: isolate;
}

.accordion input:checked~.accordion-content {
  grid-template-rows: 1fr;
}

.accordion .accordion-content {
  display: grid;
  grid-template-rows: 0fr;
  transition: all 500ms;
}

.accordion .overflow-hidden {
  overflow: hidden;
}

.accordion-content .grid-2{
  margin:0;
  margin-top: 1rem;
}
.accordion-content h3{
  font-weight: 600;
  margin-bottom: 1rem;
}

.license-info {
  display: grid;
  place-items: center;
  gap: 1rem;
  padding-block: 2rem;
  place-self: center center;
}

.license-info-item {
  display: grid;
  grid-template-columns: 9rem 12rem;
  gap: 1rem;
}

.contact-form input[type="checkbox"] {
  accent-color: green;
  height: 1.25rem;
  aspect-ratio: 1;
}
.contact-form input[type="checkbox"]~label {
  padding-left: 5px;
}


.contact-form .message{
  display:grid;
}
.contact-form .message textarea{
  resize: vertical;
  padding:1rem;
}

.contact-form .form-submit{
  display:grid;
  place-items: center;
  padding: 1rem;
}





/* utilities  */
.txt-center {
  text-align: center;
}


#response-popover:popover-open{
  display:grid;
  position: fixed;
  margin:auto auto;
  place-items: center center;
  border:2px solid var(--border-color);
  border-radius: 10px;
  padding: 2rem;
  color:var(--text-color)
}
#response-popover p{
  color: var(--text-muted);
  margin-block: 1rem;
  text-align: center;
  font-size: larger;
}


.round {
  display: flex;
  justify-content: center;
  align-items: center;
  border: none;
  outline: none;
  font-size: 2rem;
  background-color: var(--surface-color);
  border:1px solid var(--border-color);
  color: var(--accent);
  cursor: pointer;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  transition: all 300ms;
}
/* top button  */
.btn-top {
  display: none;
  position: fixed;
  bottom: 50%;
  right: 2rem;
  z-index: 99;
}

svg {
  z-index: 100;
  max-width: 3rem;
  background: transparent;
}

svg path {
  fill: none;
  stroke: var(--accent);
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: all 300ms;
}




/* download section  */
.downloads{
  grid-template-columns: repeat(auto-fit, minmax(310px, 1fr));
}

.download-xplus{
  display:grid;
  gap:1rem;
  place-items: center;
  font-size: 1.2rem;
  color:var(--text-muted);
}
.download-xplus fieldset{
  border:1px solid var(--border-color);
  border-radius: 10px;
  padding: 2rem;
}
.download-xplus fieldset legend{
  padding-inline: 1rem;
}
.download-xplus select{
  font-size: 1.2rem;
}

.selection-group{
  display:grid;
  gap:1rem;
  grid-template-columns: 7rem 7rem;
  margin-bottom: 1rem;
}

.pdf-section{
    background-color: var(--surface-color);
    padding-block: 80px;;
}
.xplus-pdfs{
  display: flex;
  flex-wrap: wrap;
  gap:1rem;
  list-style-type: none;
}
.xplus-pdfs li{
  flex:1;
}
.xplus-pdfs a{
  padding-inline: 10px;
  padding-block: 5px;
  text-decoration: none;
  white-space: nowrap;
  display:block;
  width:100%;
  height:100%;
  background-color: var(--bg-color);
  border:1px solid var(--border-color);
  border-radius: 8px;
  color:var(--text-muted);
}
.xplus-pdfs a:hover{
  background-color: var(--primary-light);
  overflow: hidden;
}
.pdf-description h2{
  color: var(--primary);
  margin-bottom: 2rem;
}
.pdf-description p{
  color: var(--text-muted);
  font-size: 1.2rem;
  margin-bottom: 2rem;
}

/* Responsive Styles */
@media (max-width: 790px) {
  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background-color: var(--surface-color);
    width: 100%;
    text-align: center;
    transition: 0.3s;
    box-shadow: var(--shadow);
    padding: 20px 0;
    gap: 20px;
  }

  .nav-menu.active {
    left: 0;
  }

  .hamburger.active .bar:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }

  .hamburger.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
}