/* ---------- base ---------- */
:root {
  --bg: #0b1020;
  --pane: #05080f;
  --muted: #d0d4e0;
  --text: #fafcff;
  --accent: #6ea8fe;
  --accent2: #b089f0;

  /* height of the mobile top bar (only shows < lg) */
  --topbar-h: 0px;
}

@media (max-width: 991.98px){
  :root { --topbar-h: 56px; }
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f8ff;
    --pane: #05080f;
    --muted: #4b4f7a;
    --text: #141a2d;
    --accent: #2f5aff;
    --accent2: #7b42ff;
  }
}

html, body {
  height: 100%;
  margin: 0;  /* << important so the hero truly reaches edges */
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, sans-serif;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
.bg-body { background: var(--bg) !important; color: var(--text) !important; }

.topbar {
  position: sticky; top: 0; z-index: 1030;
  background: linear-gradient(90deg, rgba(26,34,68,.97), rgba(26,34,68,.92));
  padding: .5rem 1rem;
}
.topbar .brand { color: #fff; text-decoration: none; font-weight: 700; }

/* -------- Sidebar -------- */
.sidebar {
  position: fixed; top: 0; left: 0; height: 100vh; width: 280px;
  background: var(--pane);
  border-right: 1px solid rgba(255,255,255,.08);
  color: var(--text);
}
.sidebar .avatar {
  width: 120px; height: 120px; border-radius: 50%; object-fit: cover;
  border: 2px solid rgba(255,255,255,.25);
}
.sidebar .avatar-sm { width: 56px; height: 56px; border-radius: 50%; }

/* Stronger contrast for headings and small text in the sidebar */
.sidebar h1, .sidebar h2, .sidebar h3, .sidebar h4, .sidebar h5, .sidebar h6 {
  color: #ffffff;
}
.sidebar .small, .sidebar small { color: #e8ecf7; }

/* Make icons bright to match text */
.sidebar i, .sidebar .bi { color: #ffffff; opacity: .95; }
.sidebar a i:hover, .sidebar a .bi:hover { opacity: 1; }

/* Make subtitle under the name brighter */
.sidebar .small,
.sidebar small,
.sidebar .subtitle {
  color: #e8ecf7 !important; /* light grey, readable on dark bg */
  font-weight: 400;
  opacity: 0.9;
}

/* Force brighter sidebar menu text + base left bar */
.sidebar .nav-link {
  color: #ffffff;
  opacity: 1;
  font-weight: 600;
  letter-spacing: .1px;
  border-left: 3px solid transparent;   /* <— add this */
  padding: .6rem 1rem;
  margin: .1rem .5rem;
  border-radius: .4rem;
}

.sidebar .nav-link:hover {
  color: var(--accent);
  background: rgba(255, 255, 255, 0.10);
}

.sidebar .nav-link.active {
  color: var(--accent);
  border-left-color: var(--accent);      /* shows now */
  background: rgba(110, 168, 254, 0.22);
}


/* -------- Main content -------- */
.main { margin-left: 0; }
@media (min-width: 992px){ .main { margin-left: 280px; } }


/* --- HERO (full screen image) --- */
/* Replace your existing .hero block with this, and DELETE the 45vh @media rule */
.hero{
  position: relative;
  /* full viewport height minus the mobile topbar if present */
  height: calc(100dvh - var(--topbar-h));
  /* fallbacks for iOS/Safari quirks */
  height: calc(100svh - var(--topbar-h));

  margin: 0;
  border: 0;
  background-image: url('../img/hero.png');   /* your file */
  background-position: center right;          /* keep DNA visible */
  background-size: cover;
  background-repeat: no-repeat;
}

.hero .hero-scrim{
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,.18) 0%, rgba(0,0,0,.32) 85%);
}

/* Slightly tighter spacing before “About” so it sits right below the hero */
.content { padding-top: 1rem; }  /* was 2rem */

/* === Social Icons in Sidebar === */
.social {
  display: flex;
  gap: 12px; /* space between icons */
  justify-content: center;
}

.social .icon-circle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;

  background: transparent;   /* no background */
  text-decoration: none;
  transition: border 0.25s ease, color 0.25s ease;
}

.social .icon-circle i {
  font-size: 18px;
  color: #fff;  /* white icons */
  line-height: 1;
}

.social .icon-circle:hover {
  border: 2px solid #fff; /* white border on hover */
}


.badge.bg-accent { background: linear-gradient(90deg, var(--accent), var(--accent2)); }
.badge.bg-accent-2 { background: linear-gradient(90deg, var(--accent2), var(--accent)); }

.content { padding-top: 2rem; padding-bottom: 3rem; }
.section { margin: 2rem 0; }
/* .section-header h2 { font-weight: 800; margin-bottom: 10rem; } */

.card-soft {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 16px;
}
.pubs { padding-left: 1.25rem; }
.pub-title { font-weight: 600; }
.pub-meta { color: var(--muted); }

footer { color: var(--muted); }

/* for doi button */
.doi-button {
  display: inline-block;
  padding: 2px 10px;
  margin-left: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  color: #fff !important;
  background-color: #0073e6;
  border-radius: 4px;
  text-decoration: none;
  transition: background-color 0.2s ease;
}

.doi-button:hover {
  background-color: #005bb5;
  text-decoration: none;
}

/* about section  */
.section-header h2 {
  font-weight: 800;
  margin-top: 20px;
  margin-bottom: 1rem;
  position: relative;
  display: inline-block;
}

.section-header h2::after {
  content: "";
  display: block;
  width: 60px;
  height: 3px;
  margin-top: 6px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 2px;
}

#about .card-soft {
  margin-bottom: 0.0rem; /* tighter spacing */
}

#about .card-soft {
  margin-bottom: 0.1rem;   /* tiny outer gap */
  padding: 0.1rem !important; /* reduce inner spacing */
}

#about .card-soft {
  margin-bottom: 0.1rem;
  padding-bottom: 0.1rem !important;  /* tighter bottom inside */
}


.about-text {
  font-family: "Roboto", "Helvetica Neue", Arial, sans-serif; /* clean + modern */
  font-size: 1.05rem;   /* ~17px, more readable */
  font-weight: 400;     /* normal */
  line-height: 1.7;     /* relaxed for blocks of text */
  text-align: justify;  /* << here’s the justification */
  margin-bottom: 0;     /* tighter spacing */
}

.language-badge {
  font-size: 0.8rem;     /* smaller text */
  padding: 4px 10px;     /* less padding around text */
  border-radius: 6px;    /* adjust corner roundness */
}

.highlight-field {
  /* font-style: italic; */
  color: #2f5aff; 
  font-weight: 600;
  color: inherit;   /* same color as text, just italic emphasis */
}


/* Research Objectives Styling */
.objective-card {
  background: #fff;
  border-radius: 10px;
  border-left: 6px solid #4f46e5; /* thick left border */
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  padding: 20px;
}

.objective-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.15);
  border-left-color: #9333ea; /* hover accent */
}

.objective-card h5 {
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.3;
  color: #111;
}

.objective-card p {
  color: #555;
  margin: 0;
  font-size: 0.95rem;
  text-align: justify;
}




.skill-card {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.skill-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.12);
}

.icon-circle {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
  font-size: 20px;
  background: linear-gradient(135deg, #4f46e5, #9333ea);
  color: #fff;
}