/* ==========================================================================
   Base & Variables
   ========================================================================== */

:root {
  --bs-primary: #0B5ED7; /* Example primary blue */
  --bs-secondary: #6C757D; /* Default Bootstrap secondary */
  --accent-color: #14A2B8; /* Example accent (teal) */
  --heading-font: 'Poppins', sans-serif;
  --body-font: 'Lato', sans-serif;
  --light-gray: #f8f9fa;
  --medium-gray: #e9ecef;
  --dark-gray: #343A40;
  --dark-blue: #1E3A8A; /* Dark blue for navbar */
  --text-color: #495057;
  --heading-color: #212529;
  --white-color: #ffffff;
  --navbar-height: 65px; /* Adjust if your navbar height changes */
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--body-font);
  line-height: 1.7;
  color: var(--text-color);
  background-color: var(--white-color);
  overflow-x: hidden; /* Prevent horizontal scroll */
  padding-top: var(--navbar-height); /* Add padding for fixed navbar */
  width: 100%;
  box-sizing: border-box;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--heading-font);
  font-weight: 600; /* Bolder headings */
  color: var(--heading-color);
  margin-bottom: 1rem;
}

h1 { font-size: 2.8rem; }
h2 { font-size: 2.2rem; }
h3 { font-size: 1.8rem; }
h4 { font-size: 1.4rem; }

p {
  margin-bottom: 1rem;
}

a {
  color: var(--bs-primary);
  text-decoration: none;
  transition: all 0.3s ease;
}

a:hover {
  color: darken(var(--bs-primary), 10%);
  text-decoration: none;
}

/* Override default Bootstrap button styles */
.btn {
  font-family: var(--heading-font);
  font-weight: 500;
  padding: 0.75rem 1.5rem;
  border-radius: 50px; /* Pill shape */
  transition: all 0.3s ease;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.btn-primary {
  background-color: var(--bs-primary);
  border-color: var(--bs-primary);
}
.btn-primary:hover {
  background-color: darken(var(--bs-primary), 10%);
  border-color: darken(var(--bs-primary), 10%);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(var(--bs-primary-rgb), 0.3);
}

.btn-outline-light {
   border-color: rgba(255, 255, 255, 0.7);
   color: rgba(255, 255, 255, 0.9);
}
.btn-outline-light:hover {
   background-color: rgba(255, 255, 255, 0.9);
   color: var(--bs-primary);
   border-color: rgba(255, 255, 255, 0.9);
   transform: translateY(-2px);
}
.btn-outline-primary {
    border-color: var(--bs-primary);
    color: var(--bs-primary);
}
.btn-outline-primary:hover {
    background-color: var(--bs-primary);
    color: var(--white-color);
    transform: translateY(-2px);
}


/* ==========================================================================
   Navbar (Transparent -> Solid on Scroll)
   ========================================================================== */

.navbar {
    padding-top: 0.8rem;
    padding-bottom: 0.8rem;
    transition: all 0.4s ease-in-out;
    height: var(--navbar-height);
}

.navbar.fixed-top {
    background-color: var(--dark-blue) !important;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15) !important;
    z-index: 1030;
}

.bg-dark-blue {
    background-color: var(--dark-blue) !important;
}

.navbar-brand {
    font-family: var(--heading-font);
    font-weight: 700;
    font-size: 1.5rem;
    transition: color 0.3s ease;
}
.navbar-brand img {
    transition: opacity 0.3s ease;
}
.navbar-brand .logo-dark { display: none; }
.navbar-brand .logo-white { display: inline-block; }


.navbar-dark .navbar-nav .nav-link {
    color: var(--white-color); /* Pure white text */
    font-family: var(--heading-font);
    font-weight: 500;
    padding: 0.5rem 1rem;
    position: relative;
    text-shadow: 0 1px 1px rgba(0,0,0,0.2);
    transition: color 0.3s ease;
}
.navbar-dark .navbar-nav .nav-link:hover,
.navbar-dark .navbar-nav .nav-link:focus {
    color: var(--white-color);
}
/* Active state styling - subtle underline */
.navbar-dark .navbar-nav .nav-link.active {
    color: var(--white-color);
}
.navbar-dark .navbar-nav .nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 1rem;
    right: 1rem;
    height: 2px;
    background-color: var(--white-color);
}


.navbar-dark .navbar-toggler {
    border-color: rgba(255, 255, 255, 0.1);
}
.navbar-dark .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.9%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Scrolled State Styles */
.navbar.navbar-scrolled {
    background-color: var(--dark-blue) !important; /* Keep dark blue when scrolled */
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15) !important;
    height: calc(var(--navbar-height) - 10px); /* Slightly smaller */
}

.navbar.navbar-scrolled .navbar-brand,
.navbar.navbar-scrolled .navbar-nav .nav-link {
    color: var(--white-color); /* Keep white text when scrolled */
    text-shadow: none;
}
.navbar.navbar-scrolled .navbar-brand .logo-dark { display: none; }
.navbar.navbar-scrolled .navbar-brand .logo-white { display: inline-block; }

.navbar.navbar-scrolled .navbar-nav .nav-link:hover,
.navbar.navbar-scrolled .navbar-nav .nav-link:focus {
    color: rgba(255, 255, 255, 0.8); /* Slightly dimmed white on hover */
}
.navbar.navbar-scrolled .navbar-nav .nav-link.active {
    color: var(--white-color); /* Pure white for active link */
}
.navbar.navbar-scrolled .navbar-nav .nav-link.active::after {
    background-color: var(--white-color); /* White underline */
}

.navbar.navbar-scrolled .navbar-toggler {
    border-color: rgba(255, 255, 255, 0.1);
}
.navbar.navbar-scrolled .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 0.9%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e"); /* White icon */
}


/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero-section {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 100vh;
    color: var(--white-color);
    overflow: hidden;
    box-sizing: border-box;
}

.hero-video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    z-index: -2;
    transform: translateX(-50%) translateY(-50%);
    background-size: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    /* Subtle gradient overlay instead of solid color */
    background: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.7));
    z-index: -1;
}

.hero-content {
    position: relative;
    z-index: 1;
    padding: 2rem;
    max-width: 800px; /* Constrain content width */
}
.hero-content h1 {
    color: var(--white-color);
    font-weight: 700;
    font-size: 3.5rem; /* Larger headline */
    margin-bottom: 1.5rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}
.hero-content p.lead {
    font-size: 1.2rem;
    margin-bottom: 2.5rem;
    color: rgba(255, 255, 255, 0.9);
}


.scroll-down-link {
    position: absolute;
    bottom: 30px; /* Slightly higher */
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.8rem; /* Larger icon */
    z-index: 2;
    animation: bounce 2.5s infinite; /* Slower bounce */
    cursor: pointer;
    transition: color 0.3s ease;
}
.scroll-down-link:hover {
    color: var(--white-color);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-15px); } /* Higher bounce */
    60% { transform: translateX(-50%) translateY(-7px); }
}

/* ==========================================================================
   General Section Styling
   ========================================================================== */
section {
    padding: 6rem 0; /* Increased vertical padding */
    overflow: hidden; /* Prevent AOS overflow issues */
    position: relative;
    z-index: 1;
    width: 100%;
    box-sizing: border-box;
}
section:nth-of-type(odd):not(.hero-section) {
     background-color: var(--light-gray); /* Alternate section backgrounds */
}
section:nth-of-type(even) {
     background-color: var(--white-color);
}
/* Remove bottom padding if footer follows directly */
main > section:last-of-type {
    padding-bottom: 3rem;
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
}
.section-title h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
    padding-bottom: 0.5rem;
}
/* Underline effect for section titles */
.section-title h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--bs-primary);
}
.section-title p {
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    color: var(--bs-secondary);
}


/* ==========================================================================
   Specific Section Styles (Examples)
   ========================================================================== */

/* Stats Banner */
.stats-banner {
    background-color: var(--light-gray);
    padding: 3rem 0;
}
.stats-banner .stat-item {
    padding: 1.5rem 0.5rem;
    transition: transform 0.3s ease;
}
.stats-banner .stat-item:hover {
    transform: translateY(-5px);
}
.stats-banner .stat-item i {
    color: var(--bs-primary);
    display: block;
}
.stats-banner .stat-item .value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--heading-color);
    margin-bottom: 0.5rem;
}
.stats-banner .stat-item .label {
    font-size: 0.9rem;
    color: var(--bs-secondary);
    letter-spacing: 1px;
    font-weight: 500;
}


/* Innovation Vision (Scientists) */
#innovation-vision {
    background-color: var(--white-color);
}
.scientist-card {
    transition: transform 0.3s ease;
}
.scientist-card:hover {
    transform: translateY(-5px);
}
.scientist-card img {
    width: 110px; /* Slightly larger */
    height: 110px;
    object-fit: cover;
    border: 4px solid var(--white-color);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}
.scientist-card h6 {
    font-size: 0.9rem;
    margin-top: 1rem;
    font-weight: 600;
    color: var(--heading-color);
}


/* Cards (Project, News, Solution) */
.card {
    border: none; /* Remove border */
    border-radius: 10px; /* More rounded corners */
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.07); /* Softer shadow */
    transition: all 0.3s ease;
    background-color: var(--white-color);
}

.card:hover {
    transform: translateY(-8px); /* More lift */
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1) !important;
}

.card-img-top {
     height: 220px; /* Slightly taller image */
     object-fit: cover;
     border-radius: 10px 10px 0 0; /* Match card rounding */
}
.card-body {
    padding: 1.75rem; /* More padding */
}
.card-title {
    font-family: var(--heading-font);
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--heading-color);
}
.card-text {
    color: var(--text-color);
    font-size: 0.95rem;
}
/* Ensure button aligns well */
.card-body .btn {
    margin-top: 1rem;
}

/* News Card Specific */
.news-card .card-text.small { /* Date */
    color: var(--bs-secondary);
    margin-bottom: 1rem;
}


/* ==========================================================================
   Footer
   ========================================================================== */
footer {
    background-color: var(--dark-gray); /* Darker background */
    color: #adb5bd;
    padding: 4rem 0 1rem 0; /* Adjust padding */
    font-size: 0.9rem;
}

footer h5 {
    color: var(--white-color);
    margin-bottom: 1.5rem;
    font-weight: 600;
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: #adb5bd;
    transition: all 0.3s ease;
}
.footer-links a:hover {
    color: var(--white-color);
    padding-left: 5px; /* Subtle hover effect */
    text-decoration: none;
}

/* Social Icons in Footer */
.social-icons {
    display: flex;
    gap: 20px;
}

.social-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    color: #fff !important;
    transition: all 0.3s ease;
}

.social-icon i {
    font-size: 1.2rem;
}

.social-icon:hover {
    background-color: var(--bs-primary);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.footer-bottom { /* Optional area for copyright */
    border-top: 1px solid #495057; /* Separator line */
    padding-top: 1.5rem;
    margin-top: 2rem;
    text-align: center;
    font-size: 0.85rem;
}


/* ==========================================================================
   Timeline Styling (for Mission Statement page)
   ========================================================================== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 3px;
    background: var(--bs-primary);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: 50px;
    padding-left: 40px;
    width: 100%;
}

.timeline-item::before {
    content: '';
    position: absolute;
    top: 15px;
    left: -8px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bs-primary);
}

.timeline-content {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    overflow: hidden; /* Prevent content overflow */
    word-wrap: break-word; /* Ensure long words don't overflow */
}

.timeline-content h4 {
    margin-bottom: 10px;
    color: var(--bs-primary);
}

@media (max-width: 767.98px) {
    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        padding-left: 60px;
        margin-bottom: 30px; /* Reduce spacing on mobile */
    }

    .timeline-item::before {
        left: 12px;
    }

    .timeline-content {
        padding: 15px; /* Smaller padding on mobile */
    }
}

/* ==========================================================================
   Responsive Adjustments (Add more as needed)
   ========================================================================== */
@media (max-width: 991.98px) {
    h1 { font-size: 2.4rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.6rem; }
    h4 { font-size: 1.3rem; }
    .hero-content h1 { font-size: 2.8rem; }
    section { padding: 4rem 0; }
    .navbar { height: auto; } /* Allow navbar to expand height */
    .navbar.navbar-scrolled { height: auto; }

    /* Adjust main content padding to account for fixed navbar */
    main {
        padding-top: 65px;
    }

    /* Adjust card spacing */
    .card {
        margin-bottom: 20px;
    }
}

@media (max-width: 767.98px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.8rem; }
    h3 { font-size: 1.5rem; }
    h4 { font-size: 1.2rem; }
    p { font-size: 0.95rem; }
    .lead { font-size: 1.1rem !important; }
    .hero-content h1 { font-size: 2.2rem; }
    .hero-content p.lead { font-size: 1rem; }
    .btn { padding: 0.6rem 1.2rem; font-size: 0.9rem;}
    .section-title h2 { font-size: 2rem; }
    footer { text-align: center; }
    footer .col-md-2, footer .col-md-3 { margin-bottom: 2rem; }
    .social-icons { justify-content: center; }

    /* Adjust section padding */
    section {
        padding: 3rem 0;
    }

    /* Ensure proper spacing for mission statement page */
    .py-5 {
        padding-top: 2rem !important;
        padding-bottom: 2rem !important;
    }

    /* Adjust card padding */
    .card-body {
        padding: 1.25rem;
    }
}

/* Extra small devices */
@media (max-width: 575.98px) {
    h1 { font-size: 1.8rem; }
    h2 { font-size: 1.6rem; }
    h3 { font-size: 1.4rem; }
    .display-5 { font-size: 1.8rem; }
    .display-4 { font-size: 2rem; }
    .hero-content h1 { font-size: 1.8rem; }

    /* Adjust section padding further */
    section {
        padding: 2.5rem 0;
    }

    /* Ensure cards don't overflow on small screens */
    .card {
        width: 100%;
        margin-left: 0;
        margin-right: 0;
    }

    /* Adjust timeline for very small screens */
    .timeline-item {
        padding-left: 50px;
    }

    .timeline-item::before {
        left: 10px;
    }

    /* Ensure proper spacing between elements */
    .mb-5 {
        margin-bottom: 2rem !important;
    }
}