/* ==========================================================================
   Style for MD Maruful Haque — Premium Portfolio
   - Mobile first
   - Semantic, accessible, responsive
   - No frameworks — vanilla CSS
   ========================================================================== */

/* -------------------------
   Variables
   ------------------------- */
:root{
  --bg: #FAFAF8;
  --card: #FFFFFF;
  --text: #111111;
  --muted: #666666;
  --border: #EAEAEA;
  --accent: #000000;

  --radius: 12px;
  --container: 1160px;
  --gutter: 1.25rem;

  --ease-curve: cubic-bezier(.22,.9,.3,1);
}

/* -------------------------
   Global reset & base
   ------------------------- */
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background:var(--bg);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.45;
  font-size:clamp(14px, 1.6vw, 18px);
  -webkit-text-size-adjust:100%;
  overflow-x:hidden;
}

/* Utility */
.container{
  width: min(100%, var(--container));
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 4rem);
}

/* Visually hidden for accessibility */
.sr-only{
  position:absolute!important;
  width:1px;height:1px;
  padding:0;margin:-1px;overflow:hidden;
  clip:rect(0,0,0,0);white-space:nowrap;border:0;
}

/* -------------------------
   Typography
   ------------------------- */
.logo-mincho{
  font-family: "Zen Old Mincho", serif;
  font-weight:700;
  letter-spacing:0.02em;
  font-size: clamp(20px, 3.2vw, 36px);
  color:var(--text);
  display:block;
}

.brand{
  display:flex;
  align-items:center;
  gap:0.75rem;
  text-decoration:none;
  color:var(--text);
}

.brand-mark{
  font-family: "Zen Old Mincho", serif;
  font-size: clamp(18px, 3vw, 28px);
  color:var(--text);
  opacity:0.9;
  display:inline-block;
  transform:translateY(-1px);
}

.brand-text .name{
  display:block;
  font-size:0.65rem;
  letter-spacing:0.06em;
  font-weight:700;
  font-family: "Inter", sans-serif;
}

/* Headings */
.display-garamond,
.section-title,
.hero-title,
.project-title,
.edu-title{
  font-family: "Cormorant Garamond", serif;
  color:var(--text);
  margin:0;
  line-height:1.02;
}

.hero-title{
  font-size: clamp(2rem, 7vw, 5.2rem);
  font-weight:700;
  letter-spacing: -0.02em;
}

.section-title{
  font-size: clamp(1.25rem, 4vw, 2.25rem);
  margin-bottom:0.6rem;
  font-weight:600;
}

.lead{
  font-size: clamp(0.95rem, 1.8vw, 1.1rem);
  color:var(--muted);
  margin-top:0.4rem;
}

/* Small text */
.small{
  color:var(--muted);
  font-size:0.9rem;
}

/* Buttons */
.btn{
  display:inline-flex;
  align-items:center;
  gap:0.6rem;
  border-radius:8px;
  border:1px solid var(--border);
  padding:0.6rem 1rem;
  font-weight:600;
  text-decoration:none;
  color:var(--text);
  background:transparent;
  cursor:pointer;
  transition:transform .35s var(--ease-curve), box-shadow .35s var(--ease-curve);
}

.btn:focus{outline:3px solid rgba(0,0,0,0.06);outline-offset:3px}

.btn:hover{transform:translateY(-4px); box-shadow: 0 8px 20px rgba(17,17,17,0.06);}

/* Primary */
.btn-primary{
  background:var(--text);
  color:var(--card);
  border:1px solid rgba(0,0,0,0.05);
  padding:0.72rem 1.2rem;
}

.btn-primary:hover{transform:translateY(-4px) scale(1.01)}

/* Ghost */
.btn-ghost{
  background:transparent;
  border:1px solid var(--border);
}

/* Secondary */
.btn-secondary{
  background:#F6F6F6;
}

/* -------------------------
   Header / Navigation
   ------------------------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:linear-gradient(var(--bg),var(--bg));
  border-bottom:1px solid var(--border);
  backdrop-filter:saturate(90%) blur(2px);
}

.header-inner{
  display:flex;
  gap:1rem;
  align-items:center;
  justify-content:space-between;
  padding: clamp(.6rem, 2.8vw, 1.2rem) 0;
}

/* Nav: mobile first (collapsed) */
.nav{
  display:flex;
  align-items:center;
  gap:1rem;
}

.nav-toggle{
  background:transparent;
  border:0;
  font-size:1.1rem;
  padding:0.45rem;
  display:flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  color:var(--text);
}

/* Nav list - collapsed */
.nav-list{
  position:fixed;
  right:1ch;
  top:72px;
  display:grid;
  gap:0.6rem;
  background:var(--card);
  padding:1rem;
  border-radius:10px;
  box-shadow:0 12px 30px rgba(17,17,17,0.06);
  border:1px solid var(--border);
  transform-origin:top right;
  opacity:0;
  pointer-events:none;
  transform:translateY(-6px) scale(.99);
}

/* Visible state */
.nav-list.open{
  opacity:1;
  pointer-events:auto;
  transform:translateY(0) scale(1);
}

/* Links */
.nav-link{
  text-decoration:none;
  color:var(--text);
  padding:0.45rem 0.6rem;
  border-radius:6px;
  font-weight:600;
  display:block;
  font-size:0.95rem;
}

.nav-link.active,
.nav-link:hover{background:transparent; color:var(--accent); text-decoration:underline 1px solid rgba(0,0,0,0.04)}

/* Desktop nav */
@media (min-width:880px){
  .nav-toggle{display:none}
  .nav-list{
    position:static;
    display:flex;
    gap:1.2rem;
    background:transparent;
    padding:0;
    border-radius:0;
    box-shadow:none;
    transform:none;
    opacity:1;
    pointer-events:auto;
  }
  .nav-list.open{transform:none}
}

/* -------------------------
   Hero
   ------------------------- */
.hero-section{
  padding: clamp(2rem, 8vw, 6rem) 0;
}

.hero-grid{
  display:grid;
  gap: clamp(1.25rem, 3.6vw, 2.5rem);
  grid-template-columns: 1fr;
  align-items:center;
}

/* Two-column on wide screens */
@media (min-width:880px){
  .hero-grid{grid-template-columns: 1fr 560px; align-items:start}
}

/* Hero content */
.kicker{
  font-size:0.95rem;
  color:var(--muted);
  margin:0 0 0.45rem;
}

.hero-subtitle{
  font-size:clamp(.95rem, 1.6vw, 1.1rem);
  color:var(--muted);
  margin-top:1rem;
  min-height:2.4rem;
}

/* Hero visual */
.hero-visual{
  width:100%;
  border-radius:12px;
  overflow:hidden;
  background:var(--card);
  border:1px solid var(--border);
  padding:1rem;
  display:flex;
  align-items:center;
  justify-content:center;
  transform:translateZ(0);
}

/* Meta list */
.meta-list{
  margin:1.1rem 0 0;
  padding:0;
  list-style:none;
  display:flex;
  gap:1.1rem;
  flex-wrap:wrap;
  color:var(--muted);
  font-size:0.95rem;
}

/* -------------------------
   About / Cards / Grid
   ------------------------- */
.section{
  padding: clamp(1.5rem, 6vw, 3.6rem) 0;
}

.about-grid{
  display:grid;
  grid-template-columns: 1fr;
  gap:clamp(1rem, 3vw, 2rem);
  align-items:start;
}

@media (min-width:880px){
  .about-grid{grid-template-columns: 1fr 340px; gap:2.4rem}
}

.about-aside .card{
  margin-bottom:1rem;
}

/* Card */
.card{
  background:var(--card);
  border:1px solid var(--border);
  padding:1rem;
  border-radius:12px;
}

.card-title{margin:0 0 .6rem 0; font-size:1rem; font-weight:700}

/* About list */
.about-list{
  margin:1rem 0;
  padding:0;
  list-style:none;
  color:var(--muted);
}

.about-list li{margin-bottom:.5rem}

/* -------------------------
   Education / Projects / Lists
   ------------------------- */
.cards-grid{
  display:grid;
  gap:1rem;
  grid-template-columns: 1fr;
}

@media (min-width:880px){
  .cards-grid{grid-template-columns: repeat(3, 1fr)}
}

.edu-card{
  background:var(--card);
  border:1px solid var(--border);
  padding:1.1rem;
  border-radius:12px;
}

.edu-title{font-size:1.05rem;margin-bottom:.3rem}
.edu-sub{color:var(--muted);margin:0 0 .6rem}
.edu-meta{font-size:.95rem;color:var(--muted)}

/* Projects */
.projects-grid{
  margin-top:1.2rem;
  display:grid;
  gap:1rem;
  grid-template-columns: 1fr;
}

@media (min-width:720px){
  .projects-grid{grid-template-columns: repeat(2, 1fr)}
}
@media (min-width:1100px){
  .projects-grid{grid-template-columns: repeat(3, 1fr)}
}

.project-card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:12px;
  overflow:hidden;
  display:flex;
  flex-direction:column;
  transition:transform .35s var(--ease-curve), box-shadow .35s var(--ease-curve);
  cursor:pointer;
}

.project-card:focus{outline:3px solid rgba(0,0,0,0.06);outline-offset:4px}
.project-card:hover{transform:translateY(-6px); box-shadow: 0 16px 40px rgba(17,17,17,0.06)}

.project-media{width:100%; aspect-ratio:16/9; overflow:hidden; display:flex; align-items:center; justify-content:center; background:var(--bg)}
.project-media svg{width:100%; height:100%; display:block; object-fit:cover; transition:transform .6s var(--ease-curve)}
.project-card:hover .project-media svg{transform:scale(1.04) translateY(-4px)}

.project-body{padding:1rem; display:flex; flex-direction:column; gap:.6rem}
.project-title{font-size:1.05rem}
.project-desc{margin:0;color:var(--muted);font-size:0.95rem}
.project-meta{display:flex;gap:.5rem;flex-wrap:wrap}
.pill{background:transparent;border:1px solid var(--border);padding:0.25rem .45rem;border-radius:20px;font-size:.8rem;color:var(--muted)}

/* -------------------------
   Skills / Soft skills
   ------------------------- */
.skills-grid{
  display:grid;
  grid-template-columns: repeat(2, 1fr);
  gap:0.8rem;
  margin-top:1rem;
}

@media (min-width:680px){ .skills-grid{grid-template-columns: repeat(4, 1fr)} }
@media (min-width:1100px){ .skills-grid{grid-template-columns: repeat(6, 1fr)} }

.skill-card{
  background:var(--card);
  border:1px solid var(--border);
  padding:1rem;
  border-radius:10px;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:.6rem;
  text-align:center;
}

.skill-icon{font-size:1.6rem;color:var(--muted)}

/* Soft skills list */
.soft-skills{margin-top:1rem}
.soft-skills ul{display:flex;flex-wrap:wrap;gap:.6rem;list-style:none;padding:0;margin:0}
.soft-skills li{background:transparent;border:1px dashed var(--border);padding:.4rem .6rem;border-radius:8px;color:var(--muted);font-size:.95rem}

/* -------------------------
   Certificates
   ------------------------- */
.cert-list{list-style:none;padding:0;margin:0;display:grid;gap:.8rem}
.cert-item{display:flex;gap:.9rem;align-items:flex-start;background:var(--card);border:1px solid var(--border);padding:.9rem;border-radius:10px}
.cert-item i{font-size:1.3rem;color:var(--muted);margin-top:4px}

/* -------------------------
   Contact
   ------------------------- */
.contact-grid{display:grid;grid-template-columns:1fr;gap:1.2rem}
@media (min-width:880px){ .contact-grid{grid-template-columns: 1fr 420px} }

.contact-large{list-style:none;padding:0;margin:1rem 0 0;display:flex;flex-direction:column;gap:.6rem}
.contact-large a{color:var(--text);text-decoration:none}
.contact-large i{margin-right:.6rem;color:var(--muted)}

.contact-form{background:var(--card);border:1px solid var(--border);padding:1rem;border-radius:12px}
.form-row{display:flex;flex-direction:column;margin-bottom:.8rem}
.form-row label{font-size:.9rem;margin-bottom:.35rem;color:var(--muted)}
.form-row input,
.form-row textarea{
  padding:.65rem .7rem;border-radius:8px;border:1px solid var(--border);font-size:1rem;background:transparent;color:var(--text)
}
.form-row input:focus,
.form-row textarea:focus{outline:3px solid rgba(0,0,0,0.06);border-color:var(--border)}
.form-actions{display:flex;gap:.6rem;align-items:center;margin-top:.6rem}
.form-note{margin-top:.6rem;color:var(--muted)}

/* -------------------------
   Modal
   ------------------------- */
.modal{
  position:fixed;
  inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  background: rgba(17,17,17,0.45);
  opacity:0;
  visibility:hidden;
  transition:opacity .35s var(--ease-curve), visibility .35s;
  z-index:120;
  padding:2rem;
}

.modal[aria-hidden="false"]{opacity:1;visibility:visible}

.modal-dialog{
  width:min(900px,100%);
  background:var(--card);
  border-radius:12px;
  padding:1.2rem;
  border:1px solid var(--border);
  position:relative;
  box-shadow:0 30px 80px rgba(17,17,17,0.08);
}

.modal-close{
  position:absolute;
  right:1rem;
  top:1rem;
  background:transparent;border:0;padding:.35rem;font-size:1.05rem;cursor:pointer;color:var(--muted)
}

.modal-header h3{margin:0 0 .2rem}
.modal-content{margin-top:.6rem}

/* -------------------------
   Footer
   ------------------------- */
.site-footer{
  border-top:1px solid var(--border);
  margin-top:2.4rem;
  padding:2rem 0 3rem;
  background:transparent;
}

.footer-grid{display:grid;gap:1rem;align-items:center}
@media (min-width:680px){ .footer-grid{grid-template-columns:1fr auto auto;align-items:center} }

.footer-nav a{color:var(--muted);text-decoration:none;margin-left:1rem;font-weight:600}
.footer-brand .small{margin:0;color:var(--muted)}
.socials a{color:var(--muted);margin-left:0.6rem;font-size:1.05rem}

/* -------------------------
   Back to top
   ------------------------- */
.back-to-top{
  position:fixed;
  right:1rem;
  bottom:1.2rem;
  width:44px;height:44px;border-radius:10px;border:1px solid var(--border);
  background:var(--card);
  display:grid;place-items:center;cursor:pointer;transform:translateY(8px);opacity:0;visibility:hidden;z-index:80;
  transition:opacity .3s var(--ease-curve), transform .35s var(--ease-curve), visibility .3s;
}
.back-to-top.show{opacity:1;visibility:visible;transform:translateY(0)}

/* -------------------------
   Reveal animations (for IntersectionObserver)
   ------------------------- */
.reveal-up,
.reveal-left,
.reveal-right{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .6s var(--ease-curve), transform .6s var(--ease-curve);
  will-change:transform,opacity;
}
.reveal-left{transform:translateX(-18px);opacity:0}
.reveal-right{transform:translateX(18px);opacity:0}

.in-view.reveal-up{opacity:1;transform:translateY(0)}
.in-view.reveal-left{opacity:1;transform:translateX(0)}
.in-view.reveal-right{opacity:1;transform:translateX(0)}

/* -------------------------
   Accessibility & Fine tuning
   ------------------------- */
a{color:inherit}
img{max-width:100%;height:auto;display:block}
h1,h2,h3,h4,h5{margin:0}

/* Prevent horizontal overflow on very small screens */
html,body{max-width:100vw;overflow-x:hidden}