/* style.css */

/* CSS Variables for Theming */
:root {
  /* Light Theme Colors (Default) */
  --bg-color: #FFFFFF;
  --bg-secondary: #F7F8FA;
  --primary-color: #0B2D5C;
  --accent-color: #C9A227;
  --text-primary: #222222;
  --text-secondary: #555555;
  --card-bg: #FFFFFF;
  --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  --border-color: #E2E8F0;
  --navbar-bg: rgba(255, 255, 255, 0.95);
  --navbar-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  --link-color: #0B2D5C;
  --logo-bg: #FFFFFF;
  --logo-border: rgba(0,0,0,0.1);
  --accordion-bg: #F7F8FA;
  --accordion-hover: #EEEEEE;
  
  /* Fonts */
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-heading: 'Roboto', 'Inter', sans-serif;
}

[data-theme="dark"] {
  /* Dark Theme Colors */
  --bg-color: #121212;
  --bg-secondary: #1E1E1E;
  --primary-color: #1E1E1E;
  --accent-color: #C9A227;
  --text-primary: #F5F5F5;
  --text-secondary: #BDBDBD;
  --card-bg: #252525;
  --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  --border-color: #333333;
  --navbar-bg: rgba(18, 18, 18, 0.95);
  --navbar-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
  --link-color: #6EA8FE;
  --logo-bg: #FFFFFF; /* Kept white to blend with logo's white background */
  --logo-border: rgba(255,255,255,0.1);
  --accordion-bg: #2A2A2A;
  --accordion-hover: #333333;
}

/* Base Reset & Typography */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

a {
  color: var(--link-color);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  text-decoration: underline;
}

ul {
  list-style: none;
}

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

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  outline: none;
}

/* Layout Utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--text-primary);
}

/* Header Elements */
.header {
  background-color: var(--bg-secondary);
  padding: 20px 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-container {
  width: 110px;
  height: 110px;
  background-color: var(--logo-bg);
  border: 1px solid var(--logo-border);
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: var(--card-shadow);
  transition: background-color 0.3s ease;
  overflow: hidden;
  padding: 8px;
}

.logo-container img {
  width: 100%;
  height: auto;
  object-fit: contain;
}

.university-info {
  text-align: center;
}

.university-info h1, .university-info h2 {
  font-size: 1.6rem;
  color: var(--primary-color);
  margin-bottom: 0.2rem;
  font-weight: 700;
}

[data-theme="dark"] .university-info h1, [data-theme="dark"] .university-info h2 {
    color: var(--text-primary);
}

.university-info h3 {
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.2rem;
}

.university-info p {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 0.1rem;
}

/* Navigation */
.navbar {
  background-color: var(--navbar-bg);
  box-shadow: var(--navbar-shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  transition: background-color 0.3s ease;
}

.navbar .container {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 15px 0;
  color: var(--text-primary);
  font-weight: 500;
  position: relative;
}

.nav-link:hover {
  text-decoration: none;
  color: var(--accent-color);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 3px;
  background-color: var(--accent-color);
  transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

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

.nav-link svg {
  width: 18px;
  height: 18px;
}

.theme-toggle {
  position: absolute;
  right: 20px;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
  font-weight: 500;
  padding: 15px 0;
  transition: color 0.2s ease;
}

.theme-toggle:hover {
  color: var(--accent-color);
}

.hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  background-color: var(--bg-secondary);
  padding: 100px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: radial-gradient(var(--border-color) 1px, transparent 1px);
  background-size: 20px 20px;
  opacity: 0.3;
  z-index: 0;
}

[data-theme="dark"] .hero::before {
    opacity: 0.05;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3.5rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

[data-theme="dark"] .hero h1 {
    color: var(--text-primary);
}

.hero h2 {
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* Experiment Cards */
.experiments-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.experiment-card {
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 30px;
  box-shadow: var(--card-shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
  height: 100%;
  border: 1px solid var(--border-color);
}

.experiment-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

[data-theme="dark"] .experiment-card:hover {
    box-shadow: 0 10px 25px rgba(0,0,0,0.4);
}

.experiment-icon {
  width: 50px;
  height: 50px;
  background-color: var(--bg-secondary);
  border-radius: 12px;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 20px;
  color: var(--accent-color);
}

.experiment-icon svg {
  width: 24px;
  height: 24px;
}

.experiment-number {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-color);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 10px;
}

.experiment-title {
  font-size: 1.2rem;
  margin-bottom: 15px;
  color: var(--text-primary);
  flex-grow: 1;
}

.experiment-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.5;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  background-color: var(--primary-color);
  color: #fff;
  border-radius: 6px;
  font-weight: 500;
  transition: background-color 0.2s ease, transform 0.1s ease;
  text-decoration: none;
}

[data-theme="dark"] .btn {
  background-color: var(--accent-color);
  color: #000;
}

.btn:hover {
  background-color: var(--accent-color);
  color: #000;
  text-decoration: none;
}

[data-theme="dark"] .btn:hover {
  background-color: #e0b838;
}

.btn:active {
  transform: scale(0.98);
}

.btn-secondary {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

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

/* Mentorship Section */
.mentorship-section {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.mentors-grid {
  display: flex;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
}

.mentor-card {
  background-color: var(--card-bg);
  padding: 40px;
  border-radius: 12px;
  box-shadow: var(--card-shadow);
  max-width: 380px;
  flex: 1 1 300px;
  text-align: center;
}

.mentor-image {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background-color: var(--border-color);
  margin: 0 auto 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--text-secondary);
}

.mentor-quote-container {
  max-width: 800px;
  margin: 30px auto 0;
}

.mentor-quote {
  font-style: italic;
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-top: 20px;
  border-left: 4px solid var(--accent-color);
  padding-left: 15px;
  text-align: left;
}

/* Footer */
.footer {
  background-color: #0B2D5C;
  color: rgba(255, 255, 255, 0.8);
  padding: 60px 0 20px;
  text-align: center;
}

[data-theme="dark"] .footer {
  background-color: #0a0a0a;
  border-top: 1px solid var(--border-color);
}

.footer h3 {
  color: #ffffff;
  margin-bottom: 10px;
}

.footer p {
  margin-bottom: 5px;
  font-size: 0.95rem;
}

.footer-bottom {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.85rem;
}

/* Experiment Page Specifics */
.breadcrumb {
  padding: 20px 0;
  display: flex;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  align-items: center;
}

.breadcrumb a {
  color: var(--text-secondary);
}

.breadcrumb a:hover {
  color: var(--accent-color);
}

.experiment-hero {
  text-align: center;
  padding: 60px 0;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.experiment-hero h1 {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

[data-theme="dark"] .experiment-hero h1 {
  color: var(--text-primary);
}

/* Contributors Accordion */
.contributors-section {
  max-width: 800px;
  margin: 40px auto;
}

.contributors-toggle {
  width: 100%;
  padding: 15px 20px;
  background-color: var(--accordion-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: background-color 0.2s ease;
}

.contributors-toggle:hover {
  background-color: var(--accordion-hover);
}

.contributors-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease-out;
}

.contributors-content.open {
  max-height: 2000px; /* large enough to contain all content */
  transition: max-height 0.4s ease-in;
}

.contributors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
  padding: 20px 0;
}

.contributor-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 20px;
  text-align: center;
  box-shadow: var(--card-shadow);
}

.contributor-img {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background-color: var(--bg-secondary);
  margin: 0 auto 15px;
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--text-secondary);
}

.contributor-name {
  font-weight: 600;
  font-size: 1.1rem;
  margin-bottom: 5px;
  color: var(--text-primary);
}

.contributor-role {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 15px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.contributor-btn {
  font-size: 0.9rem;
  padding: 8px 15px;
  width: 100%;
}

.contributor-btn:disabled {
  background-color: var(--border-color);
  color: var(--text-secondary);
  cursor: not-allowed;
  transform: none;
}

/* About & Contact Page */
.content-wrapper {
  max-width: 800px;
  margin: 0 auto;
}

.content-block {
  margin-bottom: 40px;
}

.content-block h2 {
  border-bottom: 2px solid var(--accent-color);
  padding-bottom: 10px;
  display: inline-block;
}

/* Responsive */
@media (max-width: 992px) {
  .experiments-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .university-info h1 {
    font-size: 1.5rem;
  }
}

@media (max-width: 768px) {
  .experiments-grid {
    grid-template-columns: 1fr;
  }
  
  .header .container {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
  }
  
  .logo-container {
    width: 75px;
    height: 75px;
    padding: 6px;
  }

  .university-info {
    width: 100%;
    order: 3;
    margin-top: 5px;
  }

  /* Typography Adjustments */
  .university-info h1, .university-info h2 {
    font-size: 1.3rem;
  }
  .university-info h3 {
    font-size: 1.1rem;
  }
  .university-info p {
    font-size: 0.95rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .hero h1 {
    font-size: 2.2rem;
  }
  
  .hero h2 {
    font-size: 1.2rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .experiment-hero h1 {
    font-size: 1.8rem;
  }
  
  .mentor-quote {
    font-size: 1rem;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--navbar-bg);
    box-shadow: 0 5px 10px rgba(0,0,0,0.1);
    padding: 20px;
    gap: 15px;
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .navbar .container {
    justify-content: flex-end;
    min-height: 60px;
  }
  
  .theme-toggle {
    position: static;
    margin-right: 15px;
    padding: 0;
  }

  .hamburger {
    display: block;
    margin-left: 0;
  }
}