/* =========================================================
   Mahmudul Faisal Al Ameen — personal site
   Dark & luminous · security-lattice theme
   ========================================================= */

:root{
  --ink:        #05070d;   /* near-black background        */
  --ink-2:      #0a0e18;   /* slightly raised surfaces     */
  --line:       rgba(255,255,255,0.08);
  --line-soft:  rgba(255,255,255,0.05);
  --text:       #e7ecf3;   /* primary text                 */
  --text-dim:   #9aa6b8;   /* secondary text               */
  --text-faint: #5d6878;   /* tertiary / labels            */
  --teal:       #2dd4bf;   /* luminous accent              */
  --teal-deep:  #0d7377;
  --amber:      #f5a524;   /* warm accent                  */
  --amber-deep: #c2410c;
  --maxw:       1080px;
  --ease:       cubic-bezier(.22,.61,.36,1);
}

*{ box-sizing:border-box; margin:0; padding:0; }

html{ scroll-behavior:smooth; }

body{
  background:var(--ink);
  color:var(--text);
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  font-weight:400;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

::selection{ background:rgba(45,212,191,0.25); color:#fff; }

/* ---------- Canvas + vignette ---------- */
#lattice{
  position:fixed; inset:0;
  width:100%; height:100%;
  z-index:0;
  display:block;
}
.vignette{
  position:fixed; inset:0; z-index:1; pointer-events:none;
  background:
    radial-gradient(120% 90% at 50% 0%, transparent 40%, rgba(5,7,13,0.55) 100%),
    radial-gradient(100% 100% at 50% 100%, rgba(5,7,13,0.85), transparent 60%);
}

main, .nav, .footer{ position:relative; z-index:2; }

/* ---------- Navigation ---------- */
.nav{
  position:fixed; top:0; left:0; right:0;
  display:flex; align-items:center; justify-content:space-between;
  padding:22px clamp(20px,5vw,56px);
  z-index:50;
  transition:background .4s var(--ease), padding .4s var(--ease), border-color .4s var(--ease);
  border-bottom:1px solid transparent;
}
.nav.scrolled{
  background:rgba(5,7,13,0.72);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  padding-top:16px; padding-bottom:16px;
  border-bottom:1px solid var(--line);
}
.brand{
  display:inline-flex; align-items:center; gap:9px;
  font-family:'Fraunces',serif; font-size:24px; font-weight:600;
  color:var(--text); text-decoration:none; letter-spacing:.02em;
}
.brand-mark{ width:26px; height:26px; display:block; flex-shrink:0; }
.brand-dot{ color:var(--teal); }
.nav-links{ display:flex; gap:30px; }
.nav-links a{
  color:var(--text-dim); text-decoration:none;
  font-size:14px; font-weight:500; letter-spacing:.01em;
  position:relative; padding:4px 0; transition:color .25s var(--ease);
}
.nav-links a::after{
  content:''; position:absolute; left:0; bottom:-2px; height:1px; width:0;
  background:var(--teal); transition:width .3s var(--ease);
}
.nav-links a:hover, .nav-links a.active{ color:var(--text); }
.nav-links a:hover::after, .nav-links a.active::after{ width:100%; }
.nav-toggle{
  display:none; background:none; border:none; color:var(--text);
  font-size:26px; cursor:pointer; line-height:1;
}

/* ---------- Hero ---------- */
.hero{
  min-height:100vh;
  display:flex; flex-direction:column; justify-content:center;
  padding:0 clamp(20px,6vw,80px);
  max-width:var(--maxw); margin:0 auto;
}
.kicker{
  font-family:'JetBrains Mono',monospace;
  font-size:clamp(11px,1.4vw,13px); letter-spacing:.28em; text-transform:uppercase;
  color:var(--teal); margin-bottom:28px;
}
.hero-name{
  font-family:'Fraunces',serif;
  font-weight:600;
  font-size:clamp(48px,9vw,116px);
  line-height:0.96; letter-spacing:-0.02em;
  color:#fff;
  text-shadow:0 0 60px rgba(45,212,191,0.12);
}
.hero-tag{
  margin-top:32px;
  font-size:clamp(18px,2.4vw,26px);
  font-weight:300; line-height:1.5; color:var(--text-dim);
  max-width:30ch;
}
.hero-tag em{ color:var(--teal); font-style:italic; }
.hero-meta{ display:flex; flex-wrap:wrap; gap:12px; margin-top:40px; }
.chip{
  font-family:'JetBrains Mono',monospace;
  font-size:12px; color:var(--text-faint);
  border:1px solid var(--line); border-radius:999px;
  padding:7px 15px; background:rgba(255,255,255,0.015);
}
.scroll-cue{
  position:absolute; bottom:38px; left:50%; transform:translateX(-50%);
  width:24px; height:38px; border:1px solid var(--line); border-radius:14px;
}
.scroll-cue span{
  position:absolute; top:8px; left:50%; transform:translateX(-50%);
  width:3px; height:7px; border-radius:2px; background:var(--teal);
  animation:scrolldot 1.8s var(--ease) infinite;
}
@keyframes scrolldot{ 0%{opacity:0;top:8px} 30%{opacity:1} 70%{opacity:1} 100%{opacity:0;top:22px} }

/* ---------- Sections ---------- */
.section{
  max-width:var(--maxw); margin:0 auto;
  padding:clamp(80px,12vh,150px) clamp(20px,6vw,80px);
}
.section-head{
  display:flex; align-items:baseline; gap:18px; margin-bottom:50px;
}
.section-no{
  font-family:'JetBrains Mono',monospace; font-size:14px;
  color:var(--teal); letter-spacing:.1em;
}
.section h2{
  font-family:'Fraunces',serif; font-weight:600;
  font-size:clamp(30px,5vw,52px); letter-spacing:-0.01em; color:#fff;
}

/* ---------- Prose ---------- */
.prose{ max-width:62ch; }
.prose p{ margin-bottom:20px; color:var(--text-dim); font-size:clamp(15px,1.7vw,18px); }
.prose strong{ color:var(--text); font-weight:600; }
.lede{ color:var(--text)!important; font-size:clamp(18px,2.2vw,22px)!important; font-weight:300; }
.section-intro{ margin-bottom:48px; }

/* ---------- Research cards ---------- */
.grid-cards{
  display:grid; grid-template-columns:repeat(auto-fill,minmax(290px,1fr)); gap:18px;
}
.card{
  border:1px solid var(--line); border-radius:14px;
  padding:28px 26px; background:rgba(255,255,255,0.012);
  transition:transform .4s var(--ease), border-color .4s var(--ease), background .4s var(--ease);
}
.card:hover{
  transform:translateY(-4px);
  border-color:rgba(45,212,191,0.4);
  background:rgba(45,212,191,0.04);
}
.card-tag{
  font-family:'JetBrains Mono',monospace; font-size:11px; letter-spacing:.16em;
  text-transform:uppercase; color:var(--amber);
}
.card h3{
  font-family:'Fraunces',serif; font-weight:600; font-size:21px;
  margin:14px 0 10px; color:#fff; line-height:1.2;
}
.card p{ color:var(--text-dim); font-size:15px; }
.card em{ color:var(--teal); font-style:italic; }

/* ---------- Project showcases ---------- */
.showcases{ display:flex; flex-direction:column; gap:clamp(48px,8vh,96px); }
.showcase{
  display:grid; grid-template-columns:1.05fr 0.95fr; gap:clamp(28px,5vw,56px);
  align-items:center;
}
.showcase:nth-child(even){ grid-template-columns:0.95fr 1.05fr; }
.showcase:nth-child(even) .showcase-media{ order:2; }
.showcase.no-media{
  grid-template-columns:1fr; max-width:62ch;
  padding-left:22px; border-left:1px solid var(--line);
}

.showcase-text h3{
  font-family:'Fraunces',serif; font-weight:600; font-size:clamp(26px,3.6vw,38px);
  color:#fff; line-height:1.05;
}
.showcase-top{ display:flex; align-items:center; gap:16px; margin-bottom:18px; }
.showcase-logo{
  width:52px; height:52px; border-radius:12px; flex-shrink:0;
  background:rgba(255,255,255,0.04); padding:6px; border:1px solid var(--line);
}
.showcase-text > p{
  color:var(--text-dim); font-size:clamp(15px,1.7vw,17px); line-height:1.65; max-width:56ch;
}
.showcase-text em{ color:var(--teal); font-style:italic; }
.showcase-text code, .gallery-empty code{
  font-family:'JetBrains Mono',monospace; font-size:0.9em;
  color:var(--amber); background:rgba(245,165,36,0.08);
  padding:1px 6px; border-radius:5px;
}

.project-status{
  font-family:'JetBrains Mono',monospace; font-size:11px; letter-spacing:.12em;
  color:var(--text-faint); text-transform:uppercase;
}
.project-status.live{ color:var(--teal); }
.project-status.live::before{
  content:''; display:inline-block; width:7px; height:7px; border-radius:50%;
  background:var(--teal); margin-right:7px; vertical-align:middle;
  box-shadow:0 0 8px var(--teal); animation:pulse 2s infinite;
}
@keyframes pulse{ 0%,100%{opacity:1} 50%{opacity:.35} }
.project-status.dev{ color:var(--amber); }
.project-status.dev::before{
  content:''; display:inline-block; width:7px; height:7px; border-radius:2px;
  background:var(--amber); margin-right:7px; vertical-align:middle;
  box-shadow:0 0 7px rgba(245,165,36,0.6);
}
.project-kind{
  display:inline-flex; align-items:center; gap:10px; flex-wrap:wrap;
  font-size:13px; color:var(--text-faint); margin-top:6px;
}

.feat{ list-style:none; margin:22px 0 26px; display:flex; flex-direction:column; gap:9px; }
.feat li{
  position:relative; padding-left:22px; font-size:14.5px; color:var(--text-dim);
}
.feat li::before{
  content:'→'; position:absolute; left:0; color:var(--teal);
  font-family:'JetBrains Mono',monospace; font-size:13px;
}
.showcase-links{ display:flex; flex-wrap:wrap; gap:12px; }
.feat strong{ color:var(--teal); font-weight:600; }

/* umbrella project (SafeSelf) — given extra visual weight */
.showcase.umbrella{
  max-width:none; padding:30px clamp(24px,4vw,40px);
  border-left:2px solid var(--teal); border-radius:0 14px 14px 0;
  background:linear-gradient(90deg, rgba(45,212,191,0.06), transparent 65%);
}
.showcase.umbrella h3{ font-size:clamp(30px,4.6vw,46px); }
.showcase.umbrella .feat{
  display:grid; grid-template-columns:repeat(2,minmax(240px,1fr)); gap:9px 28px; margin-bottom:0;
}
/* a product nested under the umbrella */
.parent-tag{
  font-family:'JetBrains Mono',monospace; font-size:11px; letter-spacing:.04em;
  color:var(--teal); background:rgba(45,212,191,0.1);
  border:1px solid rgba(45,212,191,0.3); border-radius:999px; padding:3px 10px;
  margin-right:4px;
}
.showcase.child-of{ margin-left:clamp(0px,4vw,52px); }
@media(max-width:820px){
  .showcase.umbrella .feat{ grid-template-columns:1fr; }
  .showcase.child-of{ margin-left:0; }
}

/* browser-frame mockup for screenshots */
.browser{
  border:1px solid var(--line); border-radius:12px; overflow:hidden;
  background:var(--ink-2); box-shadow:0 30px 70px rgba(0,0,0,0.45);
  transition:transform .5s var(--ease), box-shadow .5s var(--ease), border-color .5s var(--ease);
}
.browser:hover{
  transform:translateY(-5px);
  border-color:rgba(45,212,191,0.35);
  box-shadow:0 40px 90px rgba(0,0,0,0.55);
}
.browser-bar{
  display:flex; align-items:center; gap:7px;
  padding:11px 14px; background:rgba(255,255,255,0.03); border-bottom:1px solid var(--line);
}
.browser-bar i{ width:10px; height:10px; border-radius:50%; background:rgba(255,255,255,0.16); }
.browser-bar i:nth-child(1){ background:#ff5f57; opacity:.7; }
.browser-bar i:nth-child(2){ background:#febc2e; opacity:.7; }
.browser-bar i:nth-child(3){ background:#28c840; opacity:.7; }
.browser-bar span{
  margin-left:12px; font-family:'JetBrains Mono',monospace; font-size:12px; color:var(--text-faint);
}
.browser img{ width:100%; display:block; }

@media(max-width:820px){
  .showcase, .showcase:nth-child(even){ grid-template-columns:1fr; gap:24px; }
  .showcase:nth-child(even) .showcase-media{ order:0; }
}

/* ---------- Publications ---------- */
.pub-list{ list-style:none; }
.pub{
  display:grid; grid-template-columns:70px 1fr; gap:24px;
  padding:24px 0; border-top:1px solid var(--line-soft);
  transition:transform .35s var(--ease);
}
.pub:hover{ transform:translateX(6px); }
.pub-year{
  font-family:'JetBrains Mono',monospace; font-size:15px; color:var(--amber);
  padding-top:2px;
}
.pub-main h3{
  font-family:'Fraunces',serif; font-weight:600; font-size:clamp(17px,2.1vw,21px);
  color:var(--text); line-height:1.25; margin-bottom:8px;
}
.pub-authors{ font-size:14px; color:var(--text-dim); }
.pub-authors strong{ color:var(--teal); font-weight:600; }
.pub-venue{ font-size:13px; color:var(--text-faint); font-style:italic; margin-top:2px; }
.more-link{
  display:inline-block; margin-top:34px;
  font-family:'JetBrains Mono',monospace; font-size:14px; color:var(--teal);
  text-decoration:none; border-bottom:1px solid rgba(45,212,191,0.3);
  padding-bottom:2px; transition:border-color .3s var(--ease);
}
.more-link:hover{ border-color:var(--teal); }

/* ---------- Photography gallery ---------- */
.gallery{
  columns:3 260px; column-gap:16px;
}
.gallery .shot{
  break-inside:avoid; margin-bottom:16px; position:relative;
  border-radius:12px; overflow:hidden; cursor:pointer;
  border:1px solid var(--line); background:var(--ink-2);
  opacity:0; transform:translateY(18px);
  transition:opacity .7s var(--ease), transform .7s var(--ease), border-color .4s var(--ease);
}
.gallery .shot.shown{ opacity:1; transform:none; }
.gallery .shot img{
  width:100%; display:block; transition:transform .8s var(--ease), filter .8s var(--ease);
  filter:saturate(.92) brightness(.95);
}
.gallery .shot:hover img{ transform:scale(1.05); filter:saturate(1.05) brightness(1); }
.gallery .shot:hover{ border-color:rgba(45,212,191,0.45); }
.shot-cap{
  position:absolute; left:0; right:0; bottom:0;
  padding:34px 16px 14px; pointer-events:none;
  background:linear-gradient(transparent, rgba(5,7,13,0.92));
  opacity:0; transition:opacity .4s var(--ease);
}
.gallery .shot:hover .shot-cap{ opacity:1; }
.shot-cap .t{ display:block; font-family:'Fraunces',serif; font-size:16px; color:#fff; }
.shot-cap .m{ font-family:'JetBrains Mono',monospace; font-size:11px; color:var(--text-dim); letter-spacing:.05em; }
.gallery-empty{
  grid-column:1/-1; color:var(--text-faint);
  font-family:'JetBrains Mono',monospace; font-size:14px;
  border:1px dashed var(--line); border-radius:12px; padding:40px; text-align:center;
}

/* ---------- Lightbox ---------- */
.lightbox{
  position:fixed; inset:0; z-index:100;
  background:rgba(3,4,9,0.94); backdrop-filter:blur(6px);
  display:flex; align-items:center; justify-content:center; flex-direction:column;
  opacity:0; pointer-events:none; transition:opacity .35s var(--ease);
  padding:40px;
}
.lightbox.open{ opacity:1; pointer-events:auto; }
.lightbox img{ max-width:90vw; max-height:80vh; border-radius:8px; box-shadow:0 30px 80px rgba(0,0,0,.6); }
.lightbox-cap{ margin-top:18px; text-align:center; color:var(--text-dim); font-family:'JetBrains Mono',monospace; font-size:13px; }
.lightbox-close{
  position:absolute; top:24px; right:30px; background:none; border:none;
  color:var(--text-dim); font-size:34px; cursor:pointer; line-height:1;
}
.lightbox-close:hover{ color:#fff; }

/* ---------- Contact ---------- */
.contact{ text-align:left; }
.contact-head{ margin:14px 0 18px; }
.links{ display:flex; flex-wrap:wrap; gap:14px; margin-top:34px; }
.link-btn{
  font-family:'JetBrains Mono',monospace; font-size:14px;
  color:var(--text); text-decoration:none;
  border:1px solid var(--line); border-radius:999px; padding:12px 24px;
  transition:all .3s var(--ease);
}
.link-btn:hover{ border-color:var(--teal); color:var(--teal); transform:translateY(-2px); }
.link-btn.primary{ background:var(--teal); color:var(--ink); border-color:var(--teal); font-weight:500; }
.link-btn.primary:hover{ background:var(--teal-deep); border-color:var(--teal-deep); color:#fff; }

/* ---------- Footer ---------- */
.footer{
  max-width:var(--maxw); margin:0 auto;
  padding:40px clamp(20px,6vw,80px) 60px;
  border-top:1px solid var(--line);
  display:flex; justify-content:space-between; flex-wrap:wrap; gap:12px;
  font-family:'JetBrains Mono',monospace; font-size:12px; color:var(--text-faint);
}

/* ---------- Backdrop switcher ---------- */
.bg-switch{
  position:fixed; left:50%; bottom:22px; transform:translateX(-50%);
  z-index:60; display:flex; align-items:center; justify-content:center;
  flex-wrap:wrap; gap:4px; max-width:calc(100vw - 28px);
  padding:6px 8px; border-radius:24px;
  background:rgba(8,11,20,0.6); border:1px solid var(--line);
  backdrop-filter:blur(14px); -webkit-backdrop-filter:blur(14px);
}
.bg-switch-label{
  font-family:'JetBrains Mono',monospace; font-size:10px; letter-spacing:.22em;
  text-transform:uppercase; color:var(--text-faint); padding:0 10px 0 6px;
}
.bg-switch button{
  font-family:'JetBrains Mono',monospace; font-size:12px; letter-spacing:.04em;
  color:var(--text-dim); background:none; border:none; cursor:pointer;
  padding:7px 14px; border-radius:999px; transition:all .25s var(--ease);
}
.bg-switch button:hover{ color:var(--text); }
.bg-switch button.active{ color:var(--ink); background:var(--teal); font-weight:500; }
@media(max-width:520px){
  .bg-switch-label{ display:none; }
  .bg-switch button{ padding:7px 11px; }
}

/* ---------- Reveal animation ---------- */
.reveal{ opacity:0; transform:translateY(26px); transition:opacity .9s var(--ease), transform .9s var(--ease); }
.reveal.in{ opacity:1; transform:none; }

/* ---------- Responsive ---------- */
@media(max-width:760px){
  .nav-links{
    position:fixed; top:0; right:0; height:100vh; width:min(74vw,300px);
    flex-direction:column; gap:8px; padding:90px 32px;
    background:rgba(8,11,20,0.97); backdrop-filter:blur(16px);
    transform:translateX(100%); transition:transform .4s var(--ease);
    border-left:1px solid var(--line);
  }
  .nav-links.open{ transform:none; }
  .nav-links a{ font-size:18px; }
  .nav-toggle{ display:block; z-index:60; }
  .project{ grid-template-columns:1fr; gap:14px; }
  .project-side{ flex-direction:row; gap:18px; align-items:center; }
  .pub{ grid-template-columns:54px 1fr; gap:16px; }
  .gallery{ columns:2 150px; }
}
@media(max-width:440px){
  .gallery{ columns:1; }
}

/* ---------- Reduced motion ---------- */
@media(prefers-reduced-motion:reduce){
  *{ animation:none!important; transition:none!important; scroll-behavior:auto; }
  .reveal{ opacity:1; transform:none; }
}