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

/* Site-wide subtle geometric background */
html, body { height: 100%; }
body {
  position: relative;
  background: #f8fafc; /* fallback */
}

/* Fixed, ultra-light grid + soft gradient wash */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(120deg, rgba(29,38,113,0.06), rgba(195,55,100,0.06)),
    url("../img/bg/grid.svg");
  background-repeat: no-repeat, repeat;
  background-size: cover, 40px 40px;   /* grid spacing */
  background-position: center, top left;
}

/* Slightly lighter on mobile + larger spacing */
@media (max-width: 768px) {
  body::before {
    opacity: 0.8;
    background-size: cover, 48px 48px;
  }
}



/* Page layout: header at top, footer at bottom */
html, body { height: 100%; }
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
header { flex: 0 0 auto; }
main   { flex: 1 0 auto; }   /* pushes footer down on short pages */
footer { flex: 0 0 auto; margin-top: auto; }

/* Navbar */
header {
  background: linear-gradient(45deg, #1d2671, #c33764);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: #fff;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1rem;
}

.nav-links li a {
  color: white;
  text-decoration: none;
  transition: color 0.3s;
}

.nav-links li a:hover {
  color: yellow;
}

/* Hamburger (mobile) */
.hamburger {
  display: none;
  font-size: 2rem;
  color: white;
  cursor: pointer;
}

/* Hero */
.hero {
  height: 100vh;
  background: url("../img/bg.jpg") center/cover no-repeat;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  color: white;
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
  animation: fadeIn 2s ease-in-out;
}

.hero p {
  margin: 1rem 0;
}

.btn {
  background: yellow;
  color: black;
  padding: 0.8rem 1.5rem;
  border-radius: 25px;
  text-decoration: none;
  transition: background 0.3s;
}

.btn:hover {
  background: orange;
}

/* Content pages */
.content {
  padding: 3rem;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    flex-direction: column;
    position: absolute;
    top: 70px;
    right: 0;
    width: 200px;

    /* light background */
    background: rgba(255,255,255,0.95);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);

    /* slide-down animation */
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;

    z-index: 1001;
  }
  
  .nav-links.active { max-height: 600px; }  /* shows the menu */

  .nav-links li a { color: #1d2671; }
  .hamburger {
    display: block;
  }
}

/* Animation */
@keyframes fadeIn {
  from {opacity: 0;}
  to {opacity: 1;}
}

/* Footer */
footer {
  background: #1d2671;
  color: white;
  text-align: center;
  padding: 1.5rem 1rem;
  margin-top: 2rem;
}

footer .socials {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

footer .socials img {
  width: 32px;
  height: 32px;
  filter: brightness(0) invert(1); /* default white tint */
  transition: transform 0.3s, filter 0.3s;
}

footer .socials img:hover {
  filter: brightness(1) invert(0); /* original PNG colors */
  transform: scale(1.2);
}

footer p {
  margin: 0;
  font-size: 0.9rem;
}

/* About page layout */
.about-container {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 2rem;
}

.about-img {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

.about-text {
  flex: 1;
  font-size: 1.1rem;
  line-height: 1.6;
}

.about-text h1 {
  margin-bottom: 1rem;
  font-size: 2rem;
  color: #1d2671;
}

.about-text h2 {
  margin: 1.5rem 0 1rem;
  font-size: 1.4rem;
  color: #c33764;
}

.about-text ul {
  margin: 1rem 0 1.5rem 1.5rem;
}

@media (max-width: 768px) {
  .about-container {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .about-img {
    margin-bottom: 1.5rem;
  }

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

/* Resume Button */
.resume-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(45deg, #1d2671, #c33764);
  color: #fff;
  padding: 0.8rem 1.5rem;
  font-size: 1.05rem;
  font-weight: 700;
  border-radius: 999px;
  text-decoration: none;
  box-shadow: 0 10px 24px rgba(0,0,0,0.2);
  transition: transform .25s, filter .25s;
  backdrop-filter: saturate(1.2) blur(6px);
  border: 1px solid rgba(255,255,255,0.25);
}

.resume-btn:hover {
  transform: scale(1.05);
  filter: brightness(1.05);
}

.resume-icon {
  width: 22px;
  height: 22px;
}

/* Floating positioning */
.resume-fab {
  position: fixed;
  top: 80px; /* below navbar */
  left: 50%;
  transform: translateX(-50%);
  z-index: 999;
}

@media (max-width: 768px) {
  .resume-fab { top: 72px; }
  .resume-btn { padding: 0.65rem 1.1rem; font-size: .98rem; }
  .resume-icon { width: 20px; height: 20px; }
}

/* Research page */
.research-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
  margin-top: 1rem;
}

.research-card {
  background: rgba(255,255,255,0.75);
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: 18px;
  padding: 1.25rem 1.25rem 1.1rem;
  box-shadow: 0 10px 26px rgba(0,0,0,0.06);
  backdrop-filter: blur(6px) saturate(1.05);
}

.research-title {
  font-size: 1.25rem;
  line-height: 1.35;
  margin-bottom: 0.8rem;
  color: #1d2671;
}

.research-media {
  width: 100%;
  height: 200px;           /* fixed height */
  max-width: 400px;        /* optional: ensures box not too wide */
  margin: 0.6rem auto 0.9rem;
  border-radius: 14px;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #f0f0f0;     /* fallback background */
}

.research-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;       /* crop, don’t distort */
  opacity: 0;
  transform: translateY(6px);
  transition: opacity .8s ease, transform .8s ease;
}

.research-media img.visible {
  opacity: 1;
  transform: translateY(0);
}

.research-meta {
  margin: 0.25rem 0 0.6rem;
  color: #333;
}

.research-abstract {
  margin-bottom: 0.9rem;
}

.research-links .btn-lite {
  display: inline-block;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  border: 1px solid rgba(29,38,113,0.25);
  text-decoration: none;
  font-weight: 600;
  color: #1d2671;
  background: rgba(29,38,113,0.06);
  transition: transform .2s, background .2s, border-color .2s;
}

.research-links .btn-lite:hover {
  transform: translateY(-1px);
  background: rgba(195,55,100,0.08);
  border-color: rgba(195,55,100,0.35);
}

/* Responsive: two columns on large screens */
@media (min-width: 960px) {
  .research-grid { grid-template-columns: 1fr 1fr; }
}


/* Education timeline */
.edu-timeline {
  position: relative;
  margin-top: 1.5rem;
  padding-left: 24px;
}

.edu-timeline::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, rgba(29,38,113,.25), rgba(195,55,100,.25));
}

.edu-item {
  position: relative;
  display: grid;
  grid-template-columns: 120px 24px 1fr;
  gap: 0.75rem 1rem;
  align-items: start;
  margin-bottom: 1.25rem;
}

.edu-year {
  font-weight: 700;
  color: #1d2671;
  padding-top: .35rem;
}

.edu-marker {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  margin-top: .4rem;
  background: #c33764;
  box-shadow: 0 0 0 4px rgba(195,55,100,.15);
}

.edu-card {
  background: rgba(255,255,255,0.8);
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: 14px;
  padding: 1rem 1rem .85rem;
  box-shadow: 0 8px 22px rgba(0,0,0,0.06);
  backdrop-filter: blur(6px);
}

.edu-header {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin-bottom: .5rem;
}

.edu-logo {
  width: 44px; height: 44px; object-fit: contain;
  border-radius: 8px; background: #fff;
  border: 1px solid rgba(0,0,0,.05);
}

.edu-degree { font-size: 1.05rem; color: #1d2671; }
.edu-school { font-size: .95rem; color: #444; }

.edu-details { margin-left: 1rem; margin-top: .35rem; }
.edu-details li { margin: .25rem 0; }

.edu-links { margin-top: .6rem; }

@media (max-width: 740px) {
  .edu-item { grid-template-columns: 92px 24px 1fr; }
  .edu-year { font-size: .95rem; }
  .edu-logo { width: 40px; height: 40px; }
  /* Mobile: compact timeline cards */
  .edu-item,
  .exp-item {
    grid-template-columns: 1fr;   /* single column */
    gap: 0.5rem;
    margin-bottom: 1rem;
  }

  .edu-year,
  .exp-year {
    font-size: 0.9rem;
    margin-bottom: 0.3rem;
  }

  .edu-logo,
  .exp-logo {
    width: 32px;
    height: 32px;
  }

  .edu-card,
  .exp-card {
    padding: 0.75rem;
    font-size: 0.95rem;
    line-height: 1.4;
  }

  .edu-card,
.exp-card {
  max-height: 250px;      /* limit height */
  overflow-x: auto;       /* allow horizontal scroll if needed */
  overflow-y: auto;       /* allow vertical scroll */
  -webkit-overflow-scrolling: touch; /* smooth scroll on iOS */
  }
}

/* Experience timeline (reuses the visual language) */
.exp-timeline { position: relative; margin-top: 1.5rem; padding-left: 24px; }
.exp-timeline::before {
  content: ""; position: absolute; left: 12px; top: 0; bottom: 0; width: 2px;
  background: linear-gradient(180deg, rgba(29,38,113,.25), rgba(195,55,100,.25));
}
.exp-item { position: relative; display: grid; grid-template-columns: 140px 24px 1fr; gap: .75rem 1rem; align-items: start; margin-bottom: 1.25rem; }
.exp-year { font-weight: 700; color: #1d2671; padding-top: .35rem; }
.exp-marker { width: 14px; height: 14px; border-radius: 50%; margin-top: .4rem; background: #c33764; box-shadow: 0 0 0 4px rgba(195,55,100,.15); }
.exp-card { background: rgba(255,255,255,0.8); border: 1px solid rgba(0,0,0,0.06); border-radius: 14px; padding: 1rem; box-shadow: 0 8px 22px rgba(0,0,0,0.06); backdrop-filter: blur(6px); }
.exp-header { display: flex; align-items: center; gap: .75rem; margin-bottom: .5rem; }
.exp-logo { width: 44px; height: 44px; object-fit: contain; border-radius: 8px; background: #fff; border: 1px solid rgba(0,0,0,.05); }
.exp-title { font-size: 1.05rem; color: #1d2671; }
.exp-org { font-size: .95rem; color: #444; }
.exp-tech { margin: .35rem 0 .5rem; }
.exp-bullets { margin-left: 1rem; }
.exp-bullets li { margin: .25rem 0; }
.exp-links { margin-top: .6rem; }

@media (max-width: 740px) {
  .exp-item { grid-template-columns: 1fr !important; }
  .exp-logo { width: 32px; height: 32px; }
}

/* Youtube Html styling*/

.youtube-intro {
  margin-bottom: 1.5rem;
}

.youtube-intro p {
  font-size: 1rem;
  color: #444;
  line-height: 1.6;
  max-width: 800px;
}

.table-title {
  margin: 1rem 0 .5rem;
  font-size: 1.25rem;
  color: #1d2671;
}

.playlist-table {
  width: 100%;
  border-collapse: collapse;
  background: rgba(255,255,255,0.95);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 18px rgba(0,0,0,0.08);
}

.playlist-table th,
.playlist-table td {
  padding: .75rem 1rem;
  text-align: left;
  border-bottom: 1px solid rgba(0,0,0,0.08);
}

.playlist-table th {
  background: rgba(29,38,113,0.9);
  color: #fff;
}

.playlist-table td a img {
  width: 28px;
  height: 28px;
  transition: transform .2s ease;
}

.playlist-table td a img:hover {
  transform: scale(1.15);
}

/* DSA Tables Code*/

/* DSA Page */
.dsa-intro {
  margin-bottom: 1.5rem;
}

.dsa-intro p {
  font-size: 1rem;
  color: #444;
  line-height: 1.6;
  max-width: 800px;
}

/* DSA Tables */
.dsa-tables {
  margin-top: 1.5rem;
}

.dsa-tables h3 {
  margin: 1rem 0 .5rem;
  font-size: 1.25rem;
  color: #1d2671;
}

/* General table style */
.dsa-tables table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 2rem;
  background: rgba(255,255,255,0.95);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 18px rgba(0,0,0,0.08);
}

.dsa-tables th,
.dsa-tables td {
  padding: .75rem 1rem;
  text-align: left;
  border-bottom: 1px solid rgba(0,0,0,0.08);
}

.dsa-tables th {
  background: rgba(29,38,113,0.9);
  color: #fff;
  font-weight: 600;
}

.dsa-tables td {
  color: #333;
}

/* Link icons */
.dsa-tables td a img {
  width: 26px;
  height: 26px;
  transition: transform .2s ease;
}

.dsa-tables td a img:hover {
  transform: scale(1.15);
}

/* Responsive tables */
@media (max-width: 740px) {
  .dsa-tables table,
  .dsa-tables thead,
  .dsa-tables tbody,
  .dsa-tables th,
  .dsa-tables td,
  .dsa-tables tr {
    display: block;
    width: 100%;
  }

  .dsa-tables tr {
    margin-bottom: 1rem;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    padding: .75rem;
  }

  .dsa-tables th {
    display: none;
  }

  .dsa-tables td {
    border: none;
    padding: .5rem 0;
  }

  .dsa-tables td::before {
    content: attr(data-label);
    font-weight: bold;
    display: block;
    margin-bottom: .25rem;
    color: #1d2671;
  }
}

/* Blogs Html */

/* Blogs Accordion */
.blog-accordion {
  margin-top: 1.5rem;
}

.blog-item {
  margin-bottom: 1rem;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 6px 14px rgba(0,0,0,0.08);
  background: rgba(255,255,255,0.95);
}

.blog-header {
  width: 100%;
  text-align: left;
  padding: 1rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: #1d2671;
  background: linear-gradient(90deg, #1d2671, #c33764);
  color: #fff;
  border: none;
  cursor: pointer;
  transition: background 0.3s ease;
}

.blog-header:hover {
  filter: brightness(1.1);
}

.blog-content {
  display: none;
  padding: 1rem;
  color: #333;
  line-height: 1.6;
}

.blog-item.active .blog-content {
  display: block;
}

/* Certifications */
.certs-title {
  text-align: center;
  font-weight: 800;
  color: #1d2671;
  margin-bottom: 1.25rem;
}

.certs-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

/* Each item */
.cert-item {
  text-align: center;
}

.cert-name {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  color: #c33764;
}

/* Fixed display box: up to 2000x1700; preserve aspect; center */
.cert-img-wrap {
  max-width: 2000px;
  max-height: 1700px;
  margin: 0 auto;
  border-radius: 16px;
  overflow: hidden;
  background: rgba(255,255,255,0.85);
  box-shadow: 0 10px 26px rgba(0,0,0,0.08);
  border: 1px solid rgba(0,0,0,0.06);
}

.cert-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: contain;   /* no distortion; letterboxed if needed */
  display: block;
}

/* Responsive: scale container to viewport width */
@media (max-width: 2100px) {
  .cert-img-wrap { width: min(100%, 2000px); }
}

@media (max-width: 900px) {
  .cert-name { font-size: 1.05rem; }
  .cert-img-wrap { border-radius: 12px; }
}

/* Notes Page */
.notes-title {
  text-align: center;
  font-weight: 800;
  color: #1d2671;
  margin-bottom: 1.5rem;
}

.notes-table table {
  width: 100%;
  border-collapse: collapse;
  background: rgba(255,255,255,0.95);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 18px rgba(0,0,0,0.08);
}

.notes-table th,
.notes-table td {
  padding: .75rem 1rem;
  text-align: left;
  border-bottom: 1px solid rgba(0,0,0,0.08);
}

.notes-table th {
  background: rgba(29,38,113,0.9);
  color: #fff;
  font-weight: 600;
}

.notes-table td {
  color: #333;
}

/* Download button */
.download-button {
  display: inline-block;
  padding: .4rem .8rem;
  background: linear-gradient(90deg, #1d2671, #c33764);
  color: #fff;
  font-size: .9rem;
  font-weight: 600;
  border-radius: 6px;
  text-decoration: none;
  transition: transform .2s ease, background .2s ease;
}

.download-button:hover {
  transform: scale(1.05);
  filter: brightness(1.1);
}

/* Media Query for Resume Button */
@media (max-width: 768px) {
  .resume-fab {
    position: static;   /* remove fixed on mobile */
    margin: 1rem auto;  /* keep it centered with some spacing */
    transform: none;    /* no manual centering needed */
  }
}