*{
  font-size: 16px;
}
:root {
  /* Surfaces */
  --bg:            #e9ebee;   
  --bg-2:          #eef0f3;
  --card:          #ffffff;  
  --tint:          #f6f7f9;  

  /* Ink / text */
  --ink:           #000000;   
  --ink-soft:      #000000;
  --text:          #000000;   
  --muted:         #000000;   

  /* Accents */
  --teal:          #2f9d92;   
  --teal-deep:     #26857c;
  --rust:          #c05f34;   
  --rust-soft:     #cf7550;

  /* Lines & effects */
  --line:          #e4e7eb;
  --line-soft:     #eef0f2;
  --ring:          rgba(47,157,146,.28);

  /* Shadows */
  --shadow-card:   0 30px 70px -30px rgba(31,45,61,.28), 0 8px 24px -12px rgba(31,45,61,.12);
  --shadow-soft:   0 12px 30px -14px rgba(31,45,61,.22);
  --shadow-badge:  0 6px 16px -6px rgba(31,45,61,.28);

  /* Geometry */
  --radius-card:   28px;
  --radius:        16px;
  --radius-sm:     11px;

  /* Type */
--serif: "Times New Roman", Times, serif;
--sans: "Times New Roman", Times, serif;
--mono: "Courier New", Courier, monospace;

  /* Layout */
  --card-max:      1080px;
  --pad-x:         clamp(22px, 5vw, 72px);
}


*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
 
  scroll-padding-top: 0px;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 50% -10%, var(--bg-2), transparent 60%),
    var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  padding: 20px 20px 60px;   /* room for floating nav */
}

img { max-width: 100%; display: block; }
a   { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

/* Accessible focus ring */
:focus-visible { outline: 3px solid var(--ring); outline-offset: 3px; border-radius: 6px; }

/* Skip link */
.skip-link {
  position: fixed; top: -60px; left: 16px; z-index: 200;
  background: var(--card); color: var(--ink);
  padding: 10px 16px; border-radius: 10px; box-shadow: var(--shadow-soft);
  transition: top .25s ease;
}
.skip-link:focus { top: 16px; }

/* Thin decorative top strip */
.top-strip {
  position: fixed; inset: 0 0 auto 0; height: 0px; z-index: 90;
  background: linear-gradient(90deg, var(--teal), var(--teal-deep) 45%, var(--rust));
  opacity: .9;
}

/* 
NAVIGATION
 */
.nav-wrap {
  position: static;
  display: flex; justify-content:flex-end;
  padding: 0px 70px 10px; pointer-events: none;
}
.nav {
  pointer-events: auto;
  width: fit-content;
  display: flex; align-items: center; justify-content: flex-end;
  gap: 14px;
  padding: 8px 10px;
  background: rgba(255,255,255,.72);
  backdrop-filter: blur(14px) saturate(150%);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  border: 1px solid rgba(255,255,255,.6);
  border-radius: 999px;
  box-shadow: 0 14px 34px -18px rgba(31,45,61,.45);
}
.nav__list {
  list-style: none; margin: 0; padding: 0;
  display: flex; align-items: center; gap: 4px;
}
.nav__link {
  position: relative;
  display: inline-block;
  padding: 9px 16px;
  font-size: 14.5px; font-weight: 500;
  color: var(--ink-soft);
  border-radius: 999px;
  transition: color .25s ease, background .25s ease;
}
.nav__link:hover { color: var(--rust); }
.nav__link.is-active { 
  color: var(--rust); background: rgba(192,95,52,.10); }

.nav__link::after {
  content: ""; position: absolute; left: 50%; bottom: 3px;
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--rust); transform: translateX(-50%) scale(0);
  transition: transform .28s cubic-bezier(.34,1.56,.64,1);
}
.nav__link.is-active::after { 
  transform: translateX(-50%) scale(1); }

/* Hamburger (mobile only) */
.nav__toggle {
  display: none;
  width: 40px; height: 40px; border: none; background: transparent;
  border-radius: 12px; position: relative;
}
.nav__toggle span {
  position: absolute; left: 9px; right: 9px; height: 2px; border-radius: 2px;
  background: var(--ink); transition: transform .3s ease, opacity .2s ease, top .3s ease;
}
.nav__toggle span:nth-child(1) { top: 13px; }
.nav__toggle span:nth-child(2) { top: 19px; }
.nav__toggle span:nth-child(3) { top: 25px; }
.nav.is-open .nav__toggle span:nth-child(1) { top: 19px; transform: rotate(45deg); }
.nav.is-open .nav__toggle span:nth-child(2) { opacity: 0; }
.nav.is-open .nav__toggle span:nth-child(3) { top: 19px; transform: rotate(-45deg); }

/* 
   4. CARD + VIEW SWITCHING
 */
.card {
  width: min(var(--card-max), 100%);
  margin: 0 auto;
  background: var(--card);
  border: 1px solid rgba(255,255,255,.9);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: clamp(30px, 4.5vw, 60px) var(--pad-x) clamp(24px, 3vw, 40px);
  overflow: hidden;
}

/* Only the active view is displayed. Fade handled in animation.css */
.view { display: none; }
.view.is-active { display: block; }
/* Large scroll-margin means a hash jump to any view resolves to scroll top
   (it can't reserve this much space above), so content never lands under nav. */
.view { scroll-margin-top: 2000px; }

/* 
   5. SHARED HEADINGS
 */
.h-title {
  font-family: var(--serif);
  color: var(--ink);
  font-weight: 700;
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: .2px;
  margin: 0 0 18px;
  position: relative;
  padding-bottom: 12px;
}
.h-title::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 46px; height: 3px; border-radius: 3px;
  background: var(--ink);
}
.h-title--sub {
  font-size: clamp(1.15rem, 2.2vw, 1.35rem);
  margin-top: 6px;
}
.h-title--sub::after { width: 34px; background: var(--rust); }

.h-title-row {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 16px;
}

/* Download button beside "My Resume" */
.dl-btn {
  flex: none;
  display: inline-grid; place-items: center;
  width: 42px; height: 42px;
  color: var(--teal);
  background: rgba(47,157,146,.10);
  border: 1px solid black;
  border-radius: 12px;
  transition: transform .25s ease, background .25s ease, color .25s ease, box-shadow .25s ease;
}
.dl-btn:hover {
  transform: translateY(-2px);
  background: var(--teal); color: #fff;
  box-shadow: 0 12px 20px -10px var(--teal);
}

/* Block spacing */
.block { margin-top: clamp(30px, 4vw, 46px); }

/* Divider rule */
.rule { border: none; height: 1px; background: var(--line); margin: 30px 0 6px; }

/* Prose */
.prose { margin: 0 0 14px;  color: var(--text); }
.prose--accent { color: var(--rust); }
.lnk { border-bottom: 1px solid transparent; transition: border-color .2s ease, color .2s ease; }
.lnk--teal { color: var(--teal); }
.lnk--teal:hover { border-color: var(--teal); }
.accent-rust { color: var(--rust); }

/* Glass surface utility */
.glass {
  background: rgba(255,255,255,.66);
  backdrop-filter: blur(8px) saturate(140%);
  -webkit-backdrop-filter: blur(8px) saturate(140%);
  border: 1px solid rgba(255,255,255,.75);
  box-shadow: var(--shadow-soft);
}

/* 
   6. HERO
 */
.hero__grid {
    display: grid;
    grid-template-columns: 560px 280px;
    column-gap: 40px;   
    gap: 25px;
    justify-content: space-between;
    align-items: start;
}
/* Portrait */
.portrait {
  position: relative; margin: 0;
  width: 400px; height: 350px;
  border-radius: 18px; overflow: hidden;
  background: linear-gradient(145deg, #eef1f4, #e2e6ea);
  box-shadow: var(--shadow-soft);
  border: 5px solid #fff;
  outline: 1px solid var(--line);
}
.portrait img { width: 100%; height: 100%; object-fit: cover; }
.portrait img.is-missing { display: none; }
.portrait__ph {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 8px; color: var(--muted);
}
.portrait__ph em { font-style: normal; font-size: 12px; letter-spacing: .4px; }
/* hide placeholder once a real image loads */
.portrait img:not(.is-missing) + .portrait__ph { display: none; }


/* Name + role */
.hero__id { margin-top: clamp(20px, 3vw, 30px); }
.hero__name-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.hero__name {
  font-family: var(--serif); font-weight: 700; color: var(--ink);
  font-size: clamp(1.9rem, 4.4vw, 2.7rem); line-height: 1.1; margin: 0;
  letter-spacing: .3px;
}
.github-btn{
    width:40px;
    height:40px;

    display:flex;
    align-items:center;
    justify-content:center;

    border-radius:50%;
    background:#f4f4f4;
    color:#222;

    text-decoration:none;
    font-size:22px;

    transition:all .25s ease;
}

.github-btn:hover{
    background:#000;
    color:#fff;
    transform:translateY(-2px);
}
.hero__bar { display: none; }               /* reserved */
.hero__role {
  margin: 8px 0 0; display: flex; flex-direction: column;
  color: var(--teal-deep); font-weight: 600; line-height: 1.4;
}
.hero__role-sub { color: var(--muted); font-weight: 500; font-size: 14.5px; }

/* Contact line (email row) */
.contact-line {
  margin-top: 22px;
  display: inline-flex; align-items: center; gap: 14px;
  transition: transform .2s ease
  ;
}
.contact-line:hover { transform: translateX(2px); }
.contact-line__icon {
  flex: none; display: grid; place-items: center;
  width: 44px; height: 44px; border-radius: 13px;
  color: var(--teal); background: rgba(47,157,146,.10);
  border: 1px solid rgba(47,157,146,.20);
  box-shadow: var(--shadow-badge);
}
.contact-line__text { display: flex; flex-direction: column; line-height: 1.35; }
.contact-line__text small {
  font-size: 10.5px; letter-spacing: 1.4px; text-transform: uppercase;
  color: var(--rust); font-weight: 700; margin-bottom: 1px;
}
.contact-line__text { color: var(--ink-soft); font-weight: 500; }


/* 
   7. TIMELINE  
 */
.tl-group { margin-top: 30px; }

.tl-head { display: flex; align-items: center; gap: 14px; margin-bottom: 6px; }
.tl-badge {
  flex: none; display: grid; place-items: center;
  width: 44px; height: 44px; border-radius: 50%;
  background: #fff; color: var(--teal);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-badge);
}
.tl-heading {
  font-family: var(--serif); font-weight: 700; color: var(--ink);
  font-size: clamp(1.15rem, 2.4vw, 1.4rem); margin: 0;
}

.timeline {
  position: relative;
  margin: 6px 0 0 22px;
  padding: 6px 0 6px 30px;
  border-left: 2px solid var(--line);
}
.tl-item { 
  position: relative; padding-bottom: 26px; }
.tl-item:last-child {
   padding-bottom: 4px; }

.tl-dot {
  position: absolute; left: -39px; top: 5px;
  width: 13px; height: 13px; border-radius: 50%;
  background: #fff; border: 3px solid var(--teal);
  box-shadow: 0 0 0 4px #fff;
  transition: transform .25s ease, border-color .25s ease;
}
.tl-item:hover .tl-dot {
   transform: scale(1.18); border-color: var(--rust); }

.tl-title {
  font-family: var(--sans); font-weight: 700; color: var(--ink-soft);
  font-size: 1.02rem; margin: 0 0 3px;
}
.tl-title--sm { font-size: .98rem; }
.tl-org { margin: 0 0 3px; font-style: italic; color: var(--ink-soft); font-weight: 500; }
.tl-date { margin: 0 0 8px; color: var(--teal-deep); font-size: 14px; font-weight: 600; }
.tl-desc { margin: 0 0 4px; color: var(--text); }
.tl-course { margin: 0 0 3px; color: var(--rust); font-size: 14.5px; }
.tl-skills { margin: 0; color: var(--teal-deep); font-weight: 500; }

/* Notable courses grid (Education) */
.courses-label {
  margin: 12px 0 8px;
  color: black;
  font-weight: 600;
  font-size: 16px;
}

.courses {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid #151414;
  border-radius: 10px;
  overflow: hidden;
  max-width: 640px;
}

.courses li {
  padding: 9px 12px;
  font-size: 15px;
  color: black;
  border-bottom: 1px solid #151414;
  border-right: 1px solid #151414;
  background: #fff;
  transition: background .2s ease;
}

.courses li:hover {
  background: #f5f5f5;
}

.courses li:nth-child(2n) {
  border-right: none;
}

.courses li:nth-last-child(-n+2) {
  border-bottom: none;
}

.c-code {
  color: var(--teal);
  font-weight: 600;
  font-size: 15px;
}

/* 
   8. PROJECTS
 */
.filters {
  display: flex; flex-wrap: wrap; gap: 10px;
  margin: 4px 0 26px;
}
.filter {
  border: 1px solid var(--line); background: #fff;
  color: var(--ink-soft); font-weight: 500; font-size: 14px;
  padding: 8px 16px; border-radius: 999px;
  transition: all .22s ease;
}
.filter:hover { border-color: var(--ring); color: var(--teal-deep); transform: translateY(-1px); }
.filter.is-active { background: var(--rust); border-color: var(--rust); color: #fff; }

.proj-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: clamp(20px, 3vw, 34px) clamp(24px, 4vw, 48px);
}
.proj {
  cursor: pointer;
  display: flex; flex-direction: column;
  transition: transform .3s ease;
}
.proj__title {
  font-family: var(--serif); font-weight: 700; color: var(--ink);
  font-size: 1.12rem; line-height: 1.35; margin: 0 0 12px;
}
.img-frame {
  position: relative; width: 100%; aspect-ratio: 16 / 10;
  border-radius: 12px; overflow: hidden;
  background: linear-gradient(145deg, #f1f3f6, #e6e9ee);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
}
.img-frame img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.img-frame img.is-missing { display: none; }
.img-frame__ph {
  position: absolute; inset: 0; display: grid; place-items: center; color: var(--muted);
}
.img-frame img:not(.is-missing) + .img-frame__ph { display: none; }
.proj:hover .img-frame img:not(.is-missing) { transform: scale(1.05); }
.img-frame {
  position: relative;
}

.project-eye {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);

  width: 74px;
  height: 74px;

  display: flex;
  align-items: center;
  justify-content: center;

  background: rgba(190, 190, 190, 0.9);
  border-radius: 18px;

  color: #4d5053;
  font-size: 28px;

  opacity: 0;
  transition: opacity 0.2s ease;

  pointer-events: none;
}

.img-frame:hover .project-eye {
  opacity: 1;
}
.proj__stack {
  margin: 13px 0 6px; color: var(--teal-deep); font-weight: 600; font-size: 14px;
}
.proj__desc { margin: 0; color: var(--text); font-size: 14.5px; }

/* 
   9. ACHIEVEMENTS
 */
.ach-list { display: flex; flex-direction: column; gap: 18px; margin-top: 8px; }
.ach {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 18px 20px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  transition: transform .28s ease, box-shadow .28s ease, border-color .28s ease;
}
.ach:hover {
  transform: translateY(-3px);
  box-shadow: 0 22px 44px -24px rgba(31,45,61,.35);
  border-color: var(--ring);
}
.ach__badge {
  flex: none; display: grid; place-items: center;
  width: 42px; height: 42px; border-radius: 12px;
  color: var(--rust); background: rgba(192,95,52,.10);
  border: 1px solid rgba(192,95,52,.18);
}
.ach__title {
  font-family: var(--serif); font-weight: 700; color: var(--ink);
  font-size: 16px; margin: 0 0 4px;
}
.ach__result { margin: 0 0 6px; font-style: italic; font-weight: 600; color: var(--teal-deep); }
.ach__meta { margin: 0 0 2px; font-size: 16px; color: var(--ink-soft); font-style: italic; }
.ach__k {  font-style: italic; color: var(--muted); }
.ach__desc { margin: 8px 0 8px; color: var(--text); font-size: 16px; }
.ach__link {
  display: inline-block; color: var(--rust); font-weight: 600; font-size: 16px;
  border-bottom: 1px solid transparent; transition: border-color .2s ease;
}
.ach__link:hover { border-color: var(--rust); }

/* 
   10. CONTACT
 */
.map-frame {
  width: 100%; aspect-ratio: 21 / 9; margin: 6px 0 22px;
  border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line); box-shadow: var(--shadow-soft);
  background: #10151a;
}
.map-frame iframe {
  width: 100%; height: 100%; border: 0; display: block;
  /* dark-map styling to match reference */
  filter: grayscale(1) invert(.92) contrast(.95) brightness(.95) hue-rotate(180deg);
}

/* 
   11. FOOTER + BACK TO TOP
 */
.footer {
  margin-top: clamp(34px, 5vw, 56px);
  padding-top: 20px; border-top: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center; gap: 10px;
  color: var(--muted); font-size: 13.5px; flex-wrap: wrap;
}
.footer__dot { color: var(--line); }

.to-top {
  position: fixed; right: 24px; bottom: 24px; z-index: 95;
  width: 46px; height: 46px; border-radius: 14px; border: none;
  display: grid; place-items: center; color: #fff;
  background: linear-gradient(150deg, var(--teal), var(--teal-deep));
  box-shadow: 0 16px 30px -14px var(--teal-deep);
  opacity: 0; visibility: hidden; transform: translateY(14px);
  transition: opacity .3s ease, transform .3s ease, visibility .3s ease;
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { transform: translateY(-3px); }

/* 
   12. RESPONSIVE
 */
@media (max-width: 860px) {
  .proj-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  body { padding-top: 0px; }

  /* Nav collapses into a dropdown */
  .nav { justify-content: space-between; border-radius: 20px; padding: 8px 8px 8px 18px;
  position: relative; z-index: 1000; width: 30%;}
  .nav__toggle { display: block; }
  .nav__list {
    position: absolute; top: calc(100% + 10px); right: 0; left: 0;
    z-index: 1001;
    width: 200%;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: #ffffff;
    backdrop-filter: blur(14px);
    border: 1px solid var(--line); border-radius: 18px;
    padding: 8px; box-shadow: var(--shadow-card);
    opacity: 0; visibility: hidden; transform: translateY(-8px);
    transition: opacity .25s ease, transform .25s ease, visibility .25s ease;
  }
  .nav.is-open .nav__list { opacity: 1; visibility: visible; transform: translateY(0); }
  .nav__link { padding: 12px 16px; border-radius: 12px; }
  .nav__link::after { display: none; }
  .nav__link.is-active { background: rgba(192,95,52,.12); }

  .hero__grid { grid-template-columns: 1fr; justify-items: center; text-align: center; }
  .portrait { width: 190px; height: 220px; }
  .research { max-width: 280px; }
  .hero__id { text-align: center; }
  .hero__name {
    font-size: 27px;}
  .hero__name-row { justify-content: center; }
  .hero__role { align-items: center; }
  .contact-line { margin-left: 0; margin-right: 0; width: 100%; justify-content: flex-start; }

  .courses { grid-template-columns: 1fr; max-width: 100%; }
  .courses li:nth-child(2n) { border-right: none; }
  .courses li { border-right: none; }

  .map-frame { aspect-ratio: 4 / 3; }
}

@media (max-width: 420px) {
  .card { border-radius: 20px; }
  .filters { gap: 8px; }
  .filter { padding: 7px 13px; font-size: 13px; }
}
/* 
   TABLET / iPAD
    */

@media (max-width: 1024px) and (min-width: 721px) {

  /* Hero */
  .hero__grid {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }

  .hero__id {
    text-align: center;
  }

  .hero__name-row {
    justify-content: center;
    flex-wrap: wrap;
  }

  .hero__role {
    align-items: center;
  }

  .research {
    max-width: 500px;
  }

  /* Profile photo */
  .portrait {
    width: 300px;
    height: 340px;
  }

  /* Projects */
  .proj-grid {
    grid-template-columns: 1fr 1fr;
  }

  /* Contact */
  .contact-line {
    margin-left: auto;
    margin-right: auto;
  }
}
/* Respect reduced-motion users */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}