/* =========================================================
   Md Jisan Hossen — Academic Homepage
   Clean, professor-friendly, graduate-application-ready
   ========================================================= */

:root {
  --ink: #1a1a1a;
  --ink-soft: #3d3d3d;
  --muted: #6b6b6b;
  --line: #e3e3e3;
  --bg: #ffffff;
  --bg-alt: #f7f7f5;
  --accent: #1f4e5f;
  --accent-soft: #eef3f4;
  --max: 940px;

  --serif: Georgia, "Times New Roman", "Charter", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI",
          Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
}

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.65;
  color: var(--ink-soft);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1, h2, h3 {
  font-family: var(--serif);
  color: var(--ink);
  line-height: 1.25;
}


/* ================= Navigation ================= */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: saturate(180%) blur(6px);
}

.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 12px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-name {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--ink);
  white-space: nowrap;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--muted);
  padding: 2px 0;
  border-bottom: 2px solid transparent;
}

.nav-links a:hover {
  color: var(--accent);
  text-decoration: none;
  border-bottom-color: var(--accent);
}


/* ================= Layout ================= */

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 22px;
}

section {
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}

section:last-of-type {
  border-bottom: none;
}

.section-title {
  font-size: 1.5rem;
  margin: 0 0 18px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}


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

.hero {
  padding: 46px 0 40px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 230px 1fr;
  gap: 34px;
  align-items: start;
}


/* Profile image FIX */

.hero-photo {
  width: 230px;
  height: 230px;
  overflow: hidden;
  border-radius: 12px;
  border: 1px solid var(--line);
  box-shadow: 0 2px 14px rgba(0,0,0,0.07);
}

.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;

  /* keeps hair visible, reduces body area */
  object-position: center 15%;

  border-radius: 12px;
  display: block;
}


.hero-name {
  font-size: 2.1rem;
  margin: 0 0 4px;
}

.hero-role {
  font-size: 1.12rem;
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 10px;
}

.hero-affil {
  margin: 0 0 4px;
  color: var(--ink-soft);
}

.hero-grad {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 0.95rem;
}

.hero-focus {
  display: inline-block;
  background: var(--accent-soft);
  border: 1px solid #dce6e8;
  color: var(--accent);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.92rem;
  margin-bottom: 16px;
}

.hero-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink-soft);
  background: #fff;
}

.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}


/* ================= About ================= */

.about p {
  margin: 0 0 14px;
}


/* ================= Research Interests ================= */

.interests {
  display: grid;
  grid-template-columns: repeat(2,1fr);
  gap: 16px;
}

.interest {
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 14px 16px;
  background: var(--bg-alt);
}

.interest h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
}

.interest p {
  margin: 0;
  font-size: 0.94rem;
  color: var(--muted);
}

/* ================= Projects / Research ================= */

.entry {
  padding: 16px 0;
  border-bottom: 1px dashed var(--line);
}

.entry:last-child {
  border-bottom: none;
}

.entry-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.entry-title {
  font-size: 1.12rem;
  margin: 0;
}

.entry-title a {
  color: var(--ink);
}

.entry-title a:hover {
  color: var(--accent);
}

.entry-meta {
  font-size: 0.82rem;
  color: var(--muted);
  white-space: nowrap;
}

.entry-desc {
  margin: 6px 0 8px;
}

.entry-label {
  font-weight: 600;
  color: var(--ink);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}

.tag {
  font-size: 0.76rem;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid #dce6e8;
  padding: 2px 9px;
  border-radius: 999px;
}

.note {
  font-size: 0.92rem;
  color: var(--muted);
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 14px;
  margin-bottom: 18px;
}


/* ================= Education ================= */

.edu-item {
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
}

.edu-item:last-child {
  border-bottom: none;
}

.edu-degree {
  font-family: var(--serif);
  font-size: 1.1rem;
  color: var(--ink);
  margin: 0;
}

.edu-school {
  margin: 2px 0;
  color: var(--ink-soft);
}

.edu-date {
  font-size: 0.88rem;
  color: var(--muted);
}

.edu-item ul {
  margin: 8px 0 0;
  padding-left: 20px;
}

.edu-item li {
  margin-bottom: 4px;
  font-size: 0.95rem;
}


/* ================= Skills ================= */

.skills {
  display: grid;
  grid-template-columns: repeat(2,1fr);
  gap: 14px 24px;
}

.skill-row {
  padding: 8px 0;
  border-bottom: 1px solid var(--line);

  /* ensures AI Tools appears */
  display: block;
  visibility: visible;
  opacity: 1;
}

.skill-cat {
  font-weight: 700;
  color: var(--ink);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}

.skill-list {
  font-size: 0.95rem;
  color: var(--ink-soft);
}


/* ================= Contact ================= */

.contact p {
  margin: 0 0 14px;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.contact-list li {
  margin-bottom: 8px;
}

.contact-list .label {
  display: inline-block;
  width: 84px;
  color: var(--muted);
  font-size: 0.9rem;
}


/* ================= Footer ================= */

.footer {
  border-top: 1px solid var(--line);
  background: var(--bg-alt);
  padding: 22px 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.footer .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}


/* ================= Responsive ================= */

@media (max-width:720px) {

  .hero-grid {
    grid-template-columns:1fr;
    gap:22px;
    text-align:left;
  }

  .hero-photo {
    width:180px;
    height:180px;
  }

  .hero-photo img {
    width:100%;
    height:100%;
    object-position:center 15%;
  }

  .interests,
  .skills {
    grid-template-columns:1fr;
  }

  .nav-inner {
    flex-direction:column;
    align-items:flex-start;
    gap:8px;
  }

  .hero-name {
    font-size:1.7rem;
  }
}


/* ================= Print ================= */

@media print {

  .nav,
  .footer {
    display:none;
  }

  body {
    font-size:12pt;
    color:#000;
  }

  section {
    padding:14px 0;
  }

  a {
    color:#000;
  }

}