/* ============================================================
   Md. Aminul Islam Rony — Portfolio
   Design: Academic Journal — cream paper, deep maroon + brass
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,400;0,9..144,500;0,9..144,600;0,9..144,700;1,9..144,500&family=Inter:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  --paper:      #FAF7F1;
  --paper-2:    #F2EDE3;
  --ink:        #211D18;
  --ink-soft:   #55504A;
  --maroon:     #7A1F2B;
  --maroon-dark:#511420;
  --brass:      #9C7A2E;
  --line:       #DFD6C4;
  --line-strong:#C9BC9F;
  --white:      #FFFFFF;

  --font-display: 'Fraunces', serif;
  --font-body:    'Inter', sans-serif;
  --font-mono:    'IBM Plex Mono', monospace;

  --max-w: 1080px;
  --radius: 3px;
}

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

body{
  margin:0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img{ max-width:100%; display:block; }
a{ color: inherit; text-decoration:none; }

.wrap{
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- Eyebrow / labels ---------- */
.eyebrow{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--maroon);
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
}
.eyebrow::before{
  content:"";
  width: 22px; height: 1px;
  background: var(--maroon);
  display: inline-block;
}

/* ---------- Headings ---------- */
h1,h2,h3,h4{
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 .5em;
  letter-spacing: -0.01em;
}
h1{ font-size: clamp(2.4rem, 5vw, 3.4rem); line-height: 1.08; font-weight: 600; }
h2{ font-size: clamp(1.6rem, 3vw, 2.1rem); }
h3{ font-size: 1.3rem; }
p{ margin: 0 0 1em; color: var(--ink-soft); }

/* ---------- Header / Nav ---------- */
.site-header{
  position: sticky; top:0; z-index: 100;
  background: rgba(250,247,241,0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding: 16px 0;
}
.brand{
  display:flex; align-items:center; gap:12px;
  font-family: var(--font-display);
  font-weight:600; font-size:1.05rem;
  color: var(--ink);
}
.seal{
  width:38px; height:38px; flex:0 0 auto;
}
.brand-text{ display:flex; flex-direction:column; line-height:1.15; }
.brand-text small{
  font-family: var(--font-mono); font-size:10.5px; letter-spacing:.08em;
  color: var(--ink-soft); text-transform: uppercase;
}

.nav-links{
  display:flex; align-items:center; gap: 30px;
  list-style:none; margin:0; padding:0;
}
.nav-links a{
  font-size: 14px; font-weight:500; color: var(--ink-soft);
  position:relative; padding: 4px 0;
  transition: color .2s ease;
}
.nav-links a:hover, .nav-links a.active{ color: var(--maroon); }
.nav-links a.active::after{
  content:""; position:absolute; left:0; right:0; bottom:-4px;
  height:2px; background: var(--maroon);
}
.nav-links a.btn-resume{
  border:1px solid var(--maroon);
  padding: 7px 16px;
  border-radius: var(--radius);
  color: var(--maroon);
}
.nav-links a.btn-resume:hover{ background: var(--maroon); color: var(--white); }

.nav-toggle{
  display:none;
  background:none; border:none; cursor:pointer;
  flex-direction: column; gap:5px; padding: 6px;
}
.nav-toggle span{
  width: 24px; height: 2px; background: var(--ink);
  display:block;
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:8px;
  font-family: var(--font-body); font-weight:600; font-size:14px;
  padding: 12px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--ink);
  transition: all .2s ease;
  cursor:pointer;
}
.btn-primary{
  background: var(--maroon); border-color: var(--maroon); color: var(--white);
}
.btn-primary:hover{ background: var(--maroon-dark); border-color: var(--maroon-dark); }
.btn-ghost{
  background: transparent; border-color: var(--ink-soft); color: var(--ink);
}
.btn-ghost:hover{ border-color: var(--ink); background: var(--paper-2); }
.btn-row{ display:flex; gap:14px; flex-wrap:wrap; margin-top: 28px; }

/* ---------- Hero ---------- */
.hero{
  padding: 72px 0 60px;
  border-bottom: 1px solid var(--line);
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 56px;
  align-items:center;
}
.hero-title .accent{ color: var(--maroon); font-style: italic; font-weight:500; }
.hero-role{
  font-family: var(--font-mono); font-size: 14px; color: var(--maroon);
  margin-bottom: 18px; letter-spacing: .02em;
}
.hero-desc{ max-width: 52ch; font-size: 1.02rem; }

.portrait-frame{
  position:relative;
  border: 1px solid var(--line-strong);
  padding: 14px;
  background: var(--white);
}
.portrait-frame img{
  width:100%; aspect-ratio: 4/5; object-fit: cover;
  filter: grayscale(15%) sepia(6%);
}

/* ---------- Sections generic ---------- */
.section{ padding: 68px 0; border-bottom: 1px solid var(--line); }
.section:last-of-type{ border-bottom:none; }
.section-head{ max-width: 640px; margin-bottom: 40px; }

/* ---------- Stat / info strip ---------- */
.strip{
  display:grid; grid-template-columns: repeat(3,1fr); gap: 0;
  border: 1px solid var(--line);
  margin-top: 44px;
}
.strip > div{
  padding: 22px 24px;
  border-right: 1px solid var(--line);
}
.strip > div:last-child{ border-right:none; }
.strip label{
  display:block; font-family: var(--font-mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: .08em; color: var(--maroon);
  margin-bottom: 6px;
}
.strip p{ margin:0; font-size: 14px; color: var(--ink); }

/* ---------- Tech stack row ---------- */
.tech-row{
  display:flex; flex-wrap:wrap; gap:10px; margin-top: 28px;
}
.tech-pill{
  font-family: var(--font-mono); font-size: 12.5px;
  padding: 7px 13px;
  border: 1px solid var(--line-strong);
  border-radius: 20px;
  color: var(--ink-soft);
  background: var(--white);
}

/* ---------- Timeline (About / Experience) ---------- */
.timeline{ position:relative; margin-top: 20px; }
.timeline::before{
  content:""; position:absolute; left: 9px; top:6px; bottom:6px;
  width:1px; background: var(--line-strong);
}
.t-item{
  position:relative; padding-left: 40px; margin-bottom: 40px;
}
.t-item:last-child{ margin-bottom:0; }
.t-item::before{
  content:""; position:absolute; left:2px; top:6px;
  width:16px; height:16px; border-radius:50%;
  background: var(--paper); border: 2px solid var(--maroon);
}
.t-date{
  font-family: var(--font-mono); font-size: 12px; color: var(--maroon);
  text-transform: uppercase; letter-spacing:.05em; margin-bottom:4px; display:block;
}
.t-item h3{ margin-bottom: 4px; }
.t-org{ font-size: 14px; color: var(--ink-soft); margin-bottom: 10px; font-weight:500; }
.t-item ul{ margin: 10px 0 0; padding-left: 18px; color: var(--ink-soft); font-size: 14.5px; }
.t-item li{ margin-bottom: 6px; }

/* ---------- Project / paper cards ---------- */
.paper{
  border: 1px solid var(--line);
  background: var(--white);
  padding: 32px;
  margin-bottom: 28px;
  position: relative;
}
.paper-ref{
  font-family: var(--font-mono); font-size: 12px; color: var(--brass);
  margin-bottom: 10px; display:block;
}
.paper h3{ margin-bottom: 6px; }
.paper .paper-sub{
  font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-soft);
  margin-bottom: 16px; display:block;
}
.paper .abstract-label{
  font-family: var(--font-mono); font-size: 11px; text-transform:uppercase;
  letter-spacing:.08em; color: var(--maroon); display:block; margin-bottom:6px;
}
.paper .metrics{
  display:flex; gap: 24px; flex-wrap:wrap;
  margin: 18px 0; padding: 16px 0;
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.paper .metrics div{ font-family: var(--font-mono); font-size: 12.5px; }
.paper .metrics strong{ display:block; font-size: 18px; color: var(--maroon); font-family: var(--font-display); }
.paper-links{ display:flex; gap: 16px; margin-top: 18px; }
.paper-links a{
  font-size: 13.5px; font-weight:600; color: var(--maroon);
  border-bottom: 1px solid var(--maroon); padding-bottom:2px;
}
.paper-links a:hover{ color: var(--maroon-dark); border-color: var(--maroon-dark); }
.paper-links .disabled{
  font-size: 13.5px; color: var(--ink-soft); border-bottom: 1px dashed var(--line-strong); padding-bottom:2px;
}

/* ---------- Contact ---------- */
.contact-grid{
  display:grid; grid-template-columns: 1fr 1fr; gap: 56px;
}
.form-group{ margin-bottom: 20px; }
.form-group label{
  display:block; font-family: var(--font-mono); font-size:11px;
  text-transform:uppercase; letter-spacing:.08em; color: var(--ink-soft); margin-bottom:8px;
}
.form-group input, .form-group textarea{
  width:100%; padding: 12px 14px;
  border: 1px solid var(--line-strong); border-radius: var(--radius);
  background: var(--white); font-family: var(--font-body); font-size:14px; color: var(--ink);
}
.form-group input:focus, .form-group textarea:focus{
  outline: 2px solid var(--maroon); outline-offset: 1px; border-color: var(--maroon);
}
.form-group textarea{ min-height: 130px; resize: vertical; }
.form-status{ font-family: var(--font-mono); font-size: 13px; margin-top: 12px; min-height: 18px; }
.form-status.ok{ color: #2e6b3e; }
.form-status.err{ color: var(--maroon); }

.social-list{ list-style:none; margin: 26px 0 0; padding:0; }
.social-list li{
  border-top: 1px solid var(--line);
  padding: 16px 0;
  display:flex; justify-content:space-between; align-items:center;
}
.social-list li:last-child{ border-bottom: 1px solid var(--line); }
.social-list .label{ font-weight:600; font-size:14.5px; color: var(--ink); }
.social-list .value{ font-family: var(--font-mono); font-size:13px; color: var(--maroon); }

/* ---------- Footer ---------- */
.site-footer{
  padding: 34px 0; border-top:1px solid var(--line);
  display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:14px;
}
.site-footer p{ margin:0; font-size:13px; color: var(--ink-soft); }
.footer-links{ display:flex; gap:18px; list-style:none; margin:0; padding:0; }
.footer-links a{ font-size:13px; color: var(--ink-soft); }
.footer-links a:hover{ color: var(--maroon); }

/* ---------- Utility ---------- */
.grid-2{ display:grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.mono{ font-family: var(--font-mono); }

/* ---------- Responsive ---------- */
@media (max-width: 820px){
  .hero-grid{ grid-template-columns:1fr; }
  .portrait-frame{ max-width: 280px; }
  .strip{ grid-template-columns: 1fr; }
  .strip > div{ border-right:none; border-bottom:1px solid var(--line); }
  .contact-grid{ grid-template-columns:1fr; gap: 40px; }
  .grid-2{ grid-template-columns:1fr; }

  .nav-toggle{ display:flex; }
  .nav-links{
    position: fixed; top: var(--header-h, 68px); left:0; right:0; bottom:0;
    width: 100%; height: calc(100vh - var(--header-h, 68px));
    background: var(--paper);
    opacity: 1;
    z-index: 999;
    flex-direction: column; align-items: flex-start;
    padding: 30px 28px; gap: 22px;
    transform: translateX(100%);
    transition: transform .25s ease;
    visibility: hidden;
  }
  .nav-links.open{
    transform: translateX(0);
    visibility: visible;
    box-shadow: -8px 0 24px rgba(0,0,0,0.08);
  }
  .nav-links li{ width:100%; }
  .nav-links a{ font-size: 16px; }
  body.nav-open{ overflow: hidden; }
}