/* ============================================================
   Fahmida Yasmin Rifat — Portfolio
   Refined, image-led personal site. The keyword chips and
   timeline markers carry a light NLP/tag motif without reading
   as an academic citation page.
   ============================================================ */

:root{
  --paper:      #FAF9F6;
  --paper-dim:  #F2F0EA;
  --ink:        #14171C;
  --ink-soft:   #4A5161;
  --line:       #E2E0D8;

  --tag-domain: #2E7D6B; /* teal — keywords, timeline markers */
  --tag-org:    #3A6EA5; /* blue — links, meta */

  --font-display: "Fraunces", Georgia, serif;
  --font-body:    "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:    "IBM Plex Mono", "SF Mono", monospace;

  --max-w: 720px;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *{ animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body{
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3{
  font-family: var(--font-display);
  font-weight: 600;
  margin: 0;
  color: var(--ink);
}

.mono{ font-family: var(--font-mono); }
a{ color: inherit; }

:focus-visible{
  outline: 2px solid var(--tag-domain);
  outline-offset: 3px;
}

.skip-link{
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 0.6em 1em;
  z-index: 100;
}
.skip-link:focus{ left: 0; }

/* ---------------- NAV ---------------- */
.site-nav{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 249, 246, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.nav-inner{
  max-width: 980px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.5rem;
}
.nav-mark{
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-decoration: none;
  font-size: 0.95rem;
}
.nav-links{ display: flex; gap: 1.6rem; }
.nav-links a{
  font-family: var(--font-mono);
  font-size: 0.82rem;
  text-decoration: none;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
  position: relative;
  padding-bottom: 2px;
  transition: color 0.15s ease;
}
.nav-links a:hover, .nav-links a.active{ color: var(--ink); }
.nav-links a.active::after{
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -4px;
  height: 2px;
  background: var(--tag-domain);
}
.nav-toggle{
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span{ display: block; height: 2px; background: var(--ink); border-radius: 1px; }

/* ---------------- HERO ---------------- */
.hero{
  padding: 2.8rem 1.5rem 2.4rem;
  border-bottom: 1px solid var(--line);
  text-align: center;
}
.hero-inner{
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.profile-photo{
  width: 84px;
  height: 84px;
  border-radius: 50%;
  margin-bottom: 1rem;
  background: var(--paper-dim);
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex-shrink: 0;
}
.profile-photo img{ width: 100%; height: 100%; object-fit: cover; }
.profile-initials{
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--tag-domain);
  letter-spacing: 0.04em;
}

.hero-title{
  font-size: clamp(1.5rem, 3.4vw, 1.95rem);
  line-height: 1.15;
  margin-bottom: 0.35rem;
}

.hero-role{
  margin: 0 0 0.9rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.hero-links{
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
}

.pill-link{
  font-family: var(--font-mono);
  font-size: 0.82rem;
  text-decoration: none;
  padding: 0.5em 0.95em;
  border: 1px solid var(--line);
  border-radius: 100px;
  background: var(--paper);
  color: var(--ink);
  transition: border-color 0.15s ease, background 0.15s ease;
}
.pill-link:hover{ border-color: var(--ink); background: var(--paper-dim); }

/* ---------------- SECTIONS ---------------- */
.section{ padding: 4rem 1.5rem; border-bottom: 1px solid var(--line); }
.section-contact{ border-bottom: none; }
.section-inner{ max-width: var(--max-w); margin: 0 auto; }

.section-title{
  font-size: clamp(1.4rem, 2.8vw, 1.8rem);
  margin-bottom: 1.6rem;
}
.lede{ color: var(--ink-soft); max-width: 60ch; margin: 0; }
.lede a{
  color: var(--tag-org);
  text-decoration: none;
  border-bottom: 1px solid rgba(58, 110, 165, 0.35);
}
.lede a:hover{ border-bottom-color: var(--tag-org); }

[data-reveal]{
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
[data-reveal].is-visible{ opacity: 1; transform: none; }

/* ---------------- EXPERIENCE — role blocks ---------------- */
.role-feed{
  display: flex;
  flex-direction: column;
  gap: 1.3rem;
}
.role-block{ padding-top: 1.1rem; border-top: 1px solid var(--line); }
.role-block:first-child{ padding-top: 0; border-top: none; }
.role-block h3{ font-size: 1rem; margin-bottom: 0.2rem; }
.role-org{ margin: 0 0 0.35rem; font-weight: 500; color: var(--ink-soft); font-size: 0.93rem; }
.role-desc{ margin: 0; color: var(--ink-soft); font-size: 0.92rem; max-width: 58ch; }

/* ---------------- PROJECT SUBSECTIONS ---------------- */
.project-subsection{ margin-bottom: 2.6rem; }
.project-subsection:last-of-type{ margin-bottom: 1.4rem; }
.subsection-title{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 1.1rem;
}

/* ---------------- PUBLICATIONS — the highlighted section ---------------- */
.section-featured{
  background: var(--paper-dim);
  padding-top: 4.5rem;
  padding-bottom: 4.5rem;
}
.section-featured .section-title{ margin-bottom: 2.2rem; }

.pub-feed{
  display: flex;
  flex-direction: column;
  gap: 1.6rem;
}

.pub-card{
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 1.4rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  transition: box-shadow 0.18s ease, transform 0.18s ease;
}
.pub-card:hover{ box-shadow: 0 8px 22px rgba(20, 23, 28, 0.08); transform: translateY(-2px); }

.pub-thumb{
  background: var(--paper-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  height: 180px;
  align-self: start;
}
.pub-thumb span{
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-soft);
  background: var(--paper);
  padding: 0.3em 0.65em;
  border-radius: 100px;
  border: 1px solid var(--line);
  text-align: center;
}

.pub-body{ padding: 1.3rem 1.4rem 1.3rem 0; }
.pub-title{
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 500;
  line-height: 1.4;
}
.pub-desc{
  margin: 0 0 0.7rem;
  font-size: 0.93rem;
  color: var(--ink-soft);
  max-width: 50ch;
}
.pub-meta{ margin: 0; font-size: 0.78rem; color: var(--ink-soft); }
.pub-meta a{
  color: var(--tag-org);
  text-decoration: none;
  border-bottom: 1px solid rgba(58, 110, 165, 0.35);
}
.pub-meta a:hover{ border-bottom-color: var(--tag-org); }

@media (max-width: 600px){
  .pub-card{ grid-template-columns: 1fr; }
  .pub-thumb{ height: 200px; }
  .pub-body{ padding: 1.1rem 1.3rem 1.3rem; }
}

/* ---------------- EXPERIENCE — kept quiet/compact ---------------- */
.section-quiet{ padding-top: 3rem; padding-bottom: 3rem; }
.section-quiet .section-title{
  font-size: 1.25rem;
  color: var(--ink-soft);
  margin-bottom: 1.3rem;
}
.section-quiet .role-block h3{ color: var(--ink-soft); }

/* ---------------- PROJECTS — image-left, text-right rows ---------------- */
.proj-row{
  display: flex;
  gap: 1.3rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
}
.project-subsection .proj-row:first-of-type{ border-top: none; padding-top: 0; }

.proj-row-thumb{
  width: 150px;
  height: 104px;
  flex-shrink: 0;
  border-radius: 8px;
  overflow: hidden;
  background: repeating-linear-gradient(
    135deg,
    var(--paper-dim),
    var(--paper-dim) 10px,
    var(--paper) 10px,
    var(--paper) 20px
  );
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
}
.proj-row-thumb span{
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-soft);
  background: var(--paper);
  padding: 0.25em 0.55em;
  border-radius: 100px;
  border: 1px solid var(--line);
  text-align: center;
}

.proj-row-body{ flex: 1; min-width: 0; }
.proj-row-body h3{ font-size: 1.04rem; margin-bottom: 0.25rem; }

.proj-context{
  margin: 0 0 0.45rem;
  font-size: 0.85rem;
  font-style: italic;
  color: var(--ink-soft);
}

.proj-links{
  margin: 0 0 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}
.proj-links a{
  color: var(--tag-org);
  text-decoration: none;
  border-bottom: 1px solid rgba(58, 110, 165, 0.35);
}
.proj-links a:hover{ border-bottom-color: var(--tag-org); }
.proj-links .sep{ color: var(--ink-soft); margin: 0 0.4em; }

.proj-desc{ margin: 0; font-size: 0.93rem; color: var(--ink-soft); }

.project-note{ margin-top: 1.6rem; font-size: 0.76rem; color: var(--ink-soft); }

@media (max-width: 560px){
  .proj-row{ flex-direction: column; }
  .proj-row-thumb{ width: 100%; height: 130px; }
}

/* ---------------- FOOTER ---------------- */
.site-footer{ padding: 2.2rem 1.5rem 3rem; text-align: center; }
.site-footer p{ font-size: 0.78rem; color: var(--ink-soft); margin: 0; }

/* ---------------- RESPONSIVE ---------------- */
@media (max-width: 720px){
  .nav-links{
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    padding: 1rem 1.5rem 1.4rem;
    gap: 1rem;
    display: none;
  }
  .nav-links.open{ display: flex; }
  .nav-toggle{ display: flex; }
}