/* ------------------------------------------------------------------
   Global & Variables
------------------------------------------------------------------ */

/* Google Font — Poppins */
@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600&display=swap");

:root {
  --sidebar-width: 240px; /* kept for reference, but layout now uses grid tracks */
  --font-primary: 'Poppins', sans-serif;
  --bg-main: #fafafa;
  --bg-card: #ffffff;
  --text-main: #1C1C1E;
  --accent: #581252;
}

html {
  scroll-behavior: smooth;
}

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

html,
body {
  height: 100%;
}

/* ------------------------------------------------------------------
   Mobile‑first default ( < 769 px )
------------------------------------------------------------------ */
body {
  display: block;                /* natural flow on small screens */
  font-family: var(--font-primary);
  color: var(--text-main);
  background: var(--bg-main);
  line-height: 1.5;
}

/* ---- Sidebar (mobile) ---- */
.sidebar {
  position: static;   /* stacks naturally */
  width: 100%;
  height: auto;
  padding: 2rem 1.25rem;
  background: #fff;
  border-right: none;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: center;
  z-index: 900;
}

/* Logo sizing */
.sidebar-logo {
  width: 100%;
  height: auto;
  object-fit: contain;
}

.logo a {
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.5rem;
  text-align: center;
  display: block;
  width: 100%;
}

/* Nav */
.nav {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: center;
  width: 100%;
}

.nav a {
  text-decoration: none;
  color: var(--text-main);
  font-weight: 500;
  transition: color 0.2s ease;
  text-align: center;
  display: block;
}

.nav a:hover,
.nav a:focus {
  color: var(--accent);
}

.sidebar-footer {
  margin-top: auto;
  font-size: 0.875rem;
  text-align: center;
  color: #666;
  padding: 1rem 0;
  border-top: 1px solid #e5e5e5;
  font-family: var(--font-primary);
}

/* ---- Main Content (mobile) ---- */
main {
  width: 100%;
  overflow-x: hidden;
  padding: 0rem;
}

/* Project grid — single column by default */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  padding: 0;
}

/* Card styles */
.grid-item {
  position: relative;
  aspect-ratio: 3/2;
  overflow: hidden;
  border-radius: 0.1rem;
  background: var(--bg-card);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.06);
  transition: transform 0.3s ease;
}

.grid-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.grid-item img.top-aligned {
    width: 100% !important;
    height: 100% !important;
    object-fit: cover !important;
    object-position: top !important; 
    transition: transform 0.35s ease !important;
}

.grid-item:hover img {
  transform: scale(1.05);
}

/* Overlay */
.overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 1rem;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.grid-item:hover .overlay {
  opacity: 1;
}

.overlay h2 {
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
}

.overlay p {
  font-size: 0.875rem;
  opacity: 0.9;
}


@media (max-width: 768px) {
  .sidebar {
    position: static;        /* sidebar stays in normal flow */
    width: 100%;             /* full width on mobile */
    height: auto;            /* natural height */
    transform: none;         /* no translate */
    transition: none;        /* no animation */
    border-right: none;      /* remove border to keep it clean */
  }

  body.nav-open .sidebar {
    transform: translateX(0);
  }

    main {
    margin-left: 0;
    width: 100%;
  }
}

/* Scroll‑to‑top button (unchanged) */
.scroll-to-top {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 100;
  border: none;
  outline: none;
  background-color: #494ff6dd;
  color: white;
  cursor: pointer;
  border-radius: 50px;
  padding: 0;
  width: 50px;
  height: 50px;
  font-size: 18px;
  opacity: 0.8;
}

.scroll-to-top::after {
  content: "\2191";
}

.scroll-to-top:hover {
  opacity: 1;
  background-color: #492ca9dd;
}

/* ------------------------------------------------------------------
   ≥ 769 px — Desktop: 4‑column grid (sidebar + 3 card columns)
------------------------------------------------------------------ */
@media (min-width: 769px) {
  body {
    display: grid;
    grid-template-columns: repeat(4, 1fr); /* 4 equal 25 % columns */
  }

  .sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    border-right: 1px solid #e5e5e5;
    grid-column: 1 / 2; /* first column */
  }

  main {
    grid-column: 2 / 5; /* spans remaining 3 columns */
  }

  .grid {
    grid-template-columns: repeat(3, 1fr); /* three equal card columns */
    gap: 0rem; /* keep original card spacing on desktop */
  }
}



/* Grid layout for Research page */

.research-page .outer-grid {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
  gap: 20px;
}

.research-page .inner-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.research-intro-section {
  display: grid;
  justify-content: center;
  align-items: left;
  min-height: 120px;
  width: 100%;
  margin-bottom: 24px;
}

.research-intro-content {
  max-width: 1200px;
  width: 100%;
  padding: 24px 32px;
  color: #161717; 
  text-align: left;
}

.research-intro-hero {
  width: 100%;
  overflow: hidden;
}

.research-intro-hero img {
  width: 100%;
  height: auto;
  display: block;
}

/* ------------------------------------------------------------------
   About Page Responsive Styles
------------------------------------------------------------------ */

/* Base layout - Desktop first approach */
.about-page {
  display: grid;
  grid-template-columns: 25% 1fr; /* Sidebar 25%, main content takes remaining space */
  min-height: 100vh;
}

.about-page .main-content {
  display: flex;
  align-items: flex-start; /* top align instead of center */
  justify-content: center;
  padding: 4rem 2rem 4rem; /* adjust top padding as needed */
}

.about-page .inner-grid {
  max-width: 800px; /* Prevents text from becoming too wide */
  width: 100%;
}

.about-page .content-text {
  text-align: left; /* Left align for better readability */
  line-height: 1.6;
}

.about-page .content-text p {
  margin-bottom: 1rem;
}

/* Hero image styling */
.about-intro-hero {
  width: 100%;
  overflow: visible;
  margin-bottom: 1rem;
}

.about-intro-hero img {
  float: left;
  width: 40%; /* Adjust based on your layout */
  height: auto;
  margin-top: 0em;
  margin-right: 1.5em;
  margin-bottom: 1em;
  border-radius: 0.5rem; /* Add some visual polish */
}

/* ------------------------------------------------------------------
   Tablet styles (768px - 1024px)
------------------------------------------------------------------ */
@media (max-width: 1024px) {
  .about-page {
    grid-template-columns: 30% 1fr; /* Slightly wider sidebar on tablets */
  }
  
  .about-page .main-content {
    padding: 3rem 1.5rem 3rem;
  }
  
  .about-intro-hero img {
    width: 45%; /* Slightly larger image on tablets */
    margin-right: 1.25em;
  }
}

/* ------------------------------------------------------------------
   Mobile styles (≤ 768px)
------------------------------------------------------------------ */
@media (max-width: 768px) {
  /* Switch to single column layout */
  .about-page {
    display: block; /* Remove grid layout */
    grid-template-columns: none;
  }
  
  .about-page .sidebar {
    position: static;
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid #e5e5e5; /* Add bottom border instead */
  }
  
  .about-page .main-content {
    display: block; /* Remove flexbox */
    padding: 2rem 1.5rem;
    align-items: initial;
    justify-content: initial;
  }
  
  .about-page .inner-grid {
    max-width: 100%;
  }
  
  /* Stack image above text on mobile */
  .about-intro-hero img {
    float: none; /* Remove float */
    width: 100%; /* Full width */
    max-width: 300px; /* Maximum width for readability */
    margin: 0 auto 1.5rem auto; /* Center and add bottom margin */
    display: block; /* Ensure it's a block element */
  }
  
  .about-page .content-text {
    text-align: left;
    clear: both; /* Clear any floated elements */
  }
}

/* ------------------------------------------------------------------
   Small mobile styles (≤ 480px)
------------------------------------------------------------------ */
@media (max-width: 480px) {
  .about-page .main-content {
    padding: 1.5rem 1rem;
  }
  
  .about-intro-hero img {
    max-width: 250px; /* Smaller on very small screens */
  }
  
  .about-page .content-text {
    font-size: 0.95rem; /* Slightly smaller text */
  }
  
  .about-page .content-text p {
    margin-bottom: 1.25rem; /* More space between paragraphs */
  }
}

/* ------------------------------------------------------------------
   Ensure sidebar is responsive too
------------------------------------------------------------------ */
@media (max-width: 768px) {
  .sidebar {
    padding: 1.5rem 1rem; /* Reduce padding on mobile */
    gap: 1.5rem; /* Reduce gap between elements */
  }
  
  .logo a {
    font-size: 1.25rem; /* Slightly smaller logo text */
  }
  
  .nav {
    gap: 0.5rem; /* Tighter navigation spacing */
  }
  
  .nav a {
    padding: 0.5rem 0; /* Add some touch-friendly padding */
  }
}

/* ------------------------------------------------------------------
   Additional responsive improvements
------------------------------------------------------------------ */

/* Ensure links are touch-friendly on mobile */
@media (max-width: 768px) {
  .about-page .content-text a {
    padding: 0.25rem 0;
    margin: 0 -0.25rem;
    display: inline-block;
  }
}

/* Improve readability on all screen sizes */
.about-page .content-text {
  max-width: 65ch; /* Optimal line length for reading */
  margin: 0 auto;
}

/* Ensure images don't overflow */
.about-intro-hero img {
  max-width: 100%;
  height: auto;
}


/* responsive drawer */
@media (max-width: 768px) {
    .drawer {
        width: 100%;
        height: 100%;
    }
    
    .drawer-image {
        max-width: 100%;
        height: auto;
    }
    
    .tags {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
    }
}

/* readmore button */
body {
    font-family: var(--font-primary);
}

button {
    margin-top: 15px;
    padding: 15px 15px;
    font-size: 16px;
    cursor: pointer;
}