:root {
  --bg-color-light: #fff;
  --text-color-light: #000;
  --button-bg-light: transparent;
  --button-border-light: #000;
  --button-hover-bg-light: #000;
  --button-hover-text-light: #fff;
  --muted-light: #666;
  --accent-light: #0066cc;
  --card-bg-light: #f8f9fa;
  --border-light: #e1e5e9;

  --bg-color-dark: #0a0a0a;
  --text-color-dark: #e7e7e7;
  --button-bg-dark: transparent;
  --button-border-dark: #fff;
  --button-hover-bg-dark: #fff;
  --button-hover-text-dark: #000;
  --muted-dark: #a9a9a9;
  --accent-dark: #8af0ff;
  --card-bg-dark: #111215;
  --border-dark: #1f2126;
}

[data-theme="light"] {
  --bg-color: var(--bg-color-light);
  --text-color: var(--text-color-light);
  --button-bg: var(--button-bg-light);
  --button-border: var(--button-border-light);
  --button-hover-bg: var(--button-hover-bg-light);
  --button-hover-text: var(--button-hover-text-light);
  --muted: var(--muted-light);
  --accent: var(--accent-light);
  --card-bg: var(--card-bg-light);
  --border: var(--border-light);
}

[data-theme="dark"] {
  --bg-color: var(--bg-color-dark);
  --text-color: var(--text-color-dark);
  --button-bg: var(--button-bg-dark);
  --button-border: var(--button-border-dark);
  --button-hover-bg: var(--button-hover-bg-dark);
  --button-hover-text: var(--button-hover-text-dark);
  --muted: var(--muted-dark);
  --accent: var(--accent-dark);
  --card-bg: var(--card-bg-dark);
  --border: var(--border-dark);
}

html,
body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: 'Poppins', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  transition: background-color 0.3s, color 0.3s;
  min-height: 100vh;
  scroll-behavior: smooth;
}

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

a:hover, a:focus { 
  text-decoration: underline; 
}

/* Navigation Bar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--bg-color);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  padding: 0;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  box-sizing: border-box;
}

.navbar ul {
  list-style: none;
  margin: 0;
  padding: 12px 24px;
  display: flex;
  justify-content: center;
  gap: 2rem;
  max-width: 880px;
  width: 100%;
}

.navbar li {
  margin: 0;
}

.navbar a {
  color: var(--text-color);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 6px;
  transition: background-color 0.3s, color 0.3s;
}

.navbar a:hover {
  background-color: var(--card-bg);
  color: var(--accent);
  text-decoration: none;
}

/* Add top padding to body to account for fixed navbar */
body {
  padding-top: 60px;
}

.wrap { 
  max-width: 880px; 
  margin: 0 auto; 
  padding: 24px;
  width: 100%;
  box-sizing: border-box;
}

/* Header Styles */
header { 
  display: flex; 
  align-items: center; 
  justify-content: center; 
  padding: 24px 0 32px; 
}

.brand { 
  display: flex; 
  align-items: center; 
  justify-content: center;
}

.logo { 
  width: 600px; 
  height: 200px; 
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  position: absolute;
  top: 0;
  left: 0;
  transition: opacity 0.3s ease;
}

/* Show appropriate logo based on theme */
[data-theme="light"] .logo-dark {
  opacity: 0;
}

[data-theme="light"] .logo-light {
  opacity: 1;
}

[data-theme="dark"] .logo-light {
  opacity: 0;
}

[data-theme="dark"] .logo-dark {
  opacity: 1;
}

h1 {
  font-size: clamp(24px, 3.5vw, 40px);
  margin: 0;
  letter-spacing: 0.5px;
  font-weight: 600;
  text-align: center;
}

h2 {
  font-size: clamp(22px, 2.6vw, 28px);
  margin: 0 0 8px;
  color: var(--text-color);
  font-weight: 600;
  text-align: center;
}

h3 {
  margin: 0 0 6px;
  font-size: 18px;
  letter-spacing: 0.2px;
  font-weight: 600;
  text-align: center;
}

/* Default paragraph styling */
p {
  max-width: 70ch;
  margin: 0 auto 1rem;
  line-height: 1.5;
  text-align: center;
}

/* Sections */
section {
  margin: 60px 0;
  scroll-margin-top: 80px; /* Account for fixed navbar */
}

.hero-section {
  margin-top: 20px;
}

.work-section h2,
.about-section h2,
.contact-section h2 {
  text-align: center;
  margin-bottom: 2rem;
  font-size: clamp(28px, 4vw, 36px);
}

.work-section h3 {
  text-align: center;
  margin-top: 3rem;
  margin-bottom: 1.5rem;
}

/* Latest Updates Section */
.latest-updates-content {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: center;
  max-width: 800px;
  margin: 0 auto;
}

.updates-text {
  text-align: left;
}

.updates-text p {
  color: var(--muted);
  line-height: 1.6;
  margin: 0;
  text-align: left !important;
  max-width: none !important;
}

.updates-image {
  flex-shrink: 0;
}

.updates-image a {
  display: block;
  transition: transform 0.3s ease;
}

.updates-image a:hover {
  transform: scale(1.05);
}

.updates-image img {
  width: 180px;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  transition: box-shadow 0.3s ease;
}

.updates-image a:hover img {
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

[data-theme="dark"] .updates-image img {
  box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

[data-theme="dark"] .updates-image a:hover img {
  box-shadow: 0 4px 15px rgba(0,0,0,0.5);
}

.about-section p {
  max-width: 70ch;
  margin: 0 auto 1.5rem;
  text-align: center;
  color: var(--muted);
}

/* Josh Section */
.josh-section {
  margin: 3rem 0;
  text-align: center;
}

.josh-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  max-width: 1000px;
  margin: 0 auto;
}

.josh-text {
  text-align: left;
}

.josh-text h4 {
  color: var(--text-color);
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 1.5rem 0;
  line-height: 1.4;
}

.josh-text p {
  color: var(--muted);
  line-height: 1.6;
  margin: 0 0 1rem 0;
  text-align: left !important;
  max-width: none !important;
}

.josh-image {
  text-align: center;
}

.josh-image img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

[data-theme="dark"] .josh-image img {
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.contact-section {
  text-align: center;
}

.contact-section p {
  text-align: center;
  margin: 0 auto 1rem;
}

.contact-section form {
  margin: 0 auto;
}

/* Hero Section */
.hero { 
  margin: 40px 0 12px; 
  text-align: center;
}

.hero h2 {
  text-align: center;
  margin-bottom: 1rem;
}

.hero p { 
  margin: 0 auto; 
  color: var(--muted); 
  max-width: 62ch;
  text-align: center;
}

/* Cards Layout */
.cards { 
  display: grid; 
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); 
  gap: 16px; 
  margin: 28px 0 8px; 
}

.card { 
  background: var(--card-bg); 
  border: 1px solid var(--border); 
  border-radius: 16px; 
  padding: 16px; 
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  transition: box-shadow 0.3s, transform 0.3s;
  text-align: center;
}

[data-theme="dark"] .card {
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
}

[data-theme="dark"] .card:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}

.card h3 {
  text-align: center;
  margin-bottom: 0.5rem;
}

.card p { 
  margin: 0; 
  color: var(--muted);
  text-align: center;
}

/* Blockquotes */
blockquote { 
  margin: 22px auto; 
  padding: 16px 18px; 
  border-left: 3px solid var(--accent); 
  background: var(--card-bg); 
  border-radius: 0 12px 12px 0;
  max-width: 70ch;
  text-align: left;
}

blockquote p { 
  margin: 0;
  text-align: left;
}

.cite { 
  color: var(--muted); 
  font-size: 14px; 
  margin-top: 8px; 
  display: block; 
  opacity: 0.9;
  text-align: left;
}

/* Client Logos */
.client-logos {
  display: flex;
  flex-wrap: wrap;
  gap: 48px;
  margin: 32px auto;
  justify-content: center;
  align-items: center;
}

.client-logo {
  position: relative;
  height: 100px;
  min-width: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s, opacity 0.3s;
}

.client-logo:hover {
  transform: scale(1.05);
  text-decoration: none;
}

.client-logo img {
  max-height: 100%;
  max-width: 100%;
  object-fit: contain;
  transition: opacity 0.3s ease;
}

/* Theme-based logo switching for Levatas and Energy IQ */
.client-logo .logo-light,
.client-logo .logo-dark {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-height: 100px;
  max-width: 200px;
}

[data-theme="light"] .client-logo .logo-dark {
  opacity: 0;
}

[data-theme="light"] .client-logo .logo-light {
  opacity: 1;
}

[data-theme="dark"] .client-logo .logo-light {
  opacity: 0;
}

[data-theme="dark"] .client-logo .logo-dark {
  opacity: 1;
}

/* Single logo (like OES) that works on all backgrounds */
.client-logo img:not(.logo-light):not(.logo-dark) {
  position: static;
  transform: none;
  max-height: 100px;
  max-width: 200px;
}

/* FAQ Section */
.faq-section {
  margin: 40px 0;
}

.faq-section h3 {
  text-align: center;
  margin-bottom: 2rem;
  font-size: clamp(20px, 3vw, 24px);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  margin-bottom: 0.5rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  transition: all 0.3s ease;
  background: var(--card-bg);
}

.faq-item:hover {
  border-color: var(--accent-color);
}

.faq-question {
  width: 100%;
  padding: 1rem 1.5rem;
  background: transparent;
  border: none;
  color: var(--text-color);
  font-size: 1.1rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.3s ease;
}

.faq-question:hover {
  background-color: var(--bg-hover);
}

.faq-question:focus {
  outline: 2px solid var(--accent-color);
  outline-offset: -2px;
}

.faq-icon {
  font-size: 1.2rem;
  font-weight: bold;
  transition: transform 0.3s ease;
  color: var(--accent-color);
}

.faq-question[aria-expanded="true"] .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-answer.expanded {
  max-height: 1000px; /* Increased from 500px to accommodate longer content */
}

.faq-content {
  padding: 0 1.5rem 1.5rem;
  color: var(--muted);
  line-height: 1.6;
  text-align: left !important;
}

.faq-content p {
  margin: 0;
  font-size: 14px;
  text-align: left !important;
}

/* Client Links */
.clients { 
  display: flex; 
  flex-wrap: wrap; 
  gap: 10px 16px; 
  margin: 8px auto 2px;
  justify-content: center;
}

.clients a { 
  opacity: 0.9; 
}

.clients a:hover {
  opacity: 1;
}

/* Forms */
form { 
  margin-top: 16px; 
  display: grid; 
  gap: 12px; 
  max-width: 420px; 
}

input, textarea { 
  padding: 10px; 
  border-radius: 6px; 
  border: 1px solid var(--border); 
  background: var(--card-bg); 
  color: var(--text-color); 
  font-size: 15px; 
  font-family: inherit;
}

input:focus, textarea:focus { 
  outline: 2px solid var(--accent); 
  outline-offset: -1px;
}

button { 
  padding: 10px 14px; 
  border: none; 
  border-radius: 6px; 
  background: var(--accent); 
  color: var(--bg-color); 
  font-weight: 600; 
  cursor: pointer; 
  font-family: inherit;
  transition: opacity 0.3s;
}

button:hover { 
  opacity: 0.9; 
}

/* Footer */
footer { 
  margin: 40px 0 20px; 
  border-top: 1px solid var(--border); 
  padding-top: 16px; 
  color: var(--muted);
  text-align: center;
}

/* Theme Toggle */
.toggle-container {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  z-index: 1001;
}

.toggle {
  cursor: pointer;
  appearance: none;
  width: 50px;
  height: 26px;
  background-color: #666;
  border-radius: 13px;
  position: relative;
  outline: none;
  transition: background-color 0.3s;
}

.toggle::before {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  background-color: white;
  border-radius: 50%;
  top: 50%;
  left: 3px;
  transform: translateY(-50%);
  transition: transform 0.3s;
}

.toggle:checked::before {
  transform: translateX(24px) translateY(-50%);
}

.toggle:checked {
  background-color: var(--accent);
}

/* Responsive Design */
@media (max-width: 768px) and (min-width: 501px) {
  .wrap {
    padding: 16px;
  }
  
  .navbar ul {
    gap: 1rem;
    padding: 10px 16px;
  }
  
  .navbar a {
    font-size: 13px;
    padding: 6px 8px;
  }
}

@media (max-width: 500px) and (min-width: 401px) {
  .wrap {
    padding: 16px;
  }
  
  .navbar ul {
    gap: 0.5rem;
    padding: 10px 16px;
  }
  
  .navbar a {
    font-size: 12px;
    padding: 6px 4px;
  }

  .logo {
    width: 350px;
    height: 117px;
  }

  .josh-content {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }

  .latest-updates-content {
    grid-template-columns: 1fr;
    gap: 1rem;
    text-align: center;
  }

}

@media (max-width: 400px) {
  .wrap {
    padding: 16px;
  }
  
  .navbar ul {
    gap: 0.5rem;
    padding: 10px 16px;
    margin-right: 60px; /* Shift navbar text left to avoid toggle */
  }
  
  .navbar a {
    font-size: 12px;
    padding: 6px 4px;
  }
  
  header {
    padding: 16px 0 24px;
  }
  
  .logo {
    width: 350px;
    height: 117px;
  }
  
  section {
    margin: 40px 0;
  }
  
  .cards {
    grid-template-columns: 1fr;
  }
  
  .client-logos {
    gap: 32px;
  }
  
  .client-logo {
    height: 75px;
    min-width: 150px;
  }
  
  .client-logo .logo-light,
  .client-logo .logo-dark {
    max-height: 75px;
    max-width: 150px;
  }
  
  .client-logo img:not(.logo-light):not(.logo-dark) {
    max-height: 75px;
    max-width: 150px;
  }
  
  .faq-list {
    margin: 0 16px;
  }
  
  .faq-question {
    padding: 0.8rem 1rem;
    font-size: 1rem;
  }
  
  .faq-content {
    padding: 0 1rem 1rem;
  }
  
  .faq-answer.expanded {
    max-height: 1500px; /* Even more height on mobile for longer content */
  }
  
  .latest-updates-content {
    grid-template-columns: 1fr;
    gap: 1rem;
    text-align: center;
  }
  
  .updates-text {
    text-align: center;
  }
  
  .updates-image {
    order: -1; /* Move image above text on mobile */
  }
  
  .updates-image img {
    width: 140px;
  }
  
  .josh-content {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }
  
  .josh-text {
    text-align: center;
  }
  
  .josh-image img {
    max-width: 300px;
  }

  .clients {
    justify-content: center;
  }
}

.description {
  margin: 0.5rem 0 0;
  font-size: 1rem;
  color: var(--text-color);
  opacity: 0.8;
  text-align: left;
  max-width: 800px;
}

.styled-hr {
  border: none;
  border-top: 2px solid var(--border);
  margin: 2rem 0;
  width: 100%;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.thumbnail {
  width: 100px;
  height: 100px;
  object-fit: cover;
  cursor: pointer;
  border-radius: 8px;
  transition: transform 0.3s;
  border: 2px solid var(--border);
}

.thumbnail:hover {
  transform: scale(1.1);
  border-color: var(--accent);
}

.paper-content {
  display: flex;
  flex-direction: column;
  justify-content: left;
}

.title-container {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.arxiv-logo {
  width: 20px;
  height: 20px;
  vertical-align: middle;
  cursor: pointer;
  transition: transform 0.3s;
}

.arxiv-logo:hover {
  transform: scale(1.1);
}

.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  overflow: auto;
}

.modal-content {
  display: block;
  margin: auto;
  max-width: 90%;
  max-height: 90%;
  border-radius: 8px;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  color: white;
  font-size: 2rem;
  font-weight: bold;
  cursor: pointer;
}