/*
  2026 Portfolio — styles.css
  - Dark mode by default
  - Single unified central panel
  - Modern typography, smooth gradients, motion
  - Useful utility classes and accessible focus states
*/

:root{
  --panel-gap: 28px;
  --content-width: 1100px;
  --radius: 18px;
  --accent-1: #7c3aed; /* purple */
  --accent-2: #4f46e5; /* indigo */
  --muted: #9fb0c8;
  --text: #e6eef7;
  --panel-bg: rgba(8,12,22,0.64);
  --card-bg: rgba(255,255,255,0.03);
  --glass: rgba(255,255,255,0.04);
  --shadow-lg: 0 24px 80px rgba(2,6,23,0.65);
  --shadow-sm: 0 8px 26px rgba(2,6,23,0.45);
  --transition: 280ms cubic-bezier(.2,.9,.2,1);
}

/* 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;
  color:var(--text);
  background: linear-gradient(180deg,#030512 0%, #071029 100%);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  position:relative;
  min-height:100vh;
}

/* Animated, subtle background glow */
body::before{
  content:"";
  position:fixed;inset:0;z-index:-3;pointer-events:none;
  background:
    radial-gradient(800px 600px at 12% 12%, rgba(124,58,237,0.10) 0%, rgba(124,58,237,0.035) 30%, transparent 60%),
    radial-gradient(900px 500px at 88% 84%, rgba(79,70,229,0.06) 0%, rgba(79,70,229,0.02) 28%, transparent 60%);
  filter:blur(22px) saturate(110%);
  transform:translate3d(0,0,0);
  animation: glowPan 18s ease-in-out infinite;
}
@keyframes glowPan{
  0%{transform:translate3d(0,0,0) scale(1)}
  50%{transform:translate3d(-4%,2%,0) scale(1.02)}
  100%{transform:translate3d(0,0,0) scale(1)}
}

/* Central continuous panel behind the content (covers whole document height) */
body::after{
  content:"";
  position:absolute;
  top:var(--panel-gap);
  left:50%;
  transform:translateX(-50%);
  right:auto;
  bottom:var(--panel-gap);
  width:min(1200px,94%);
  background: linear-gradient(180deg, rgba(255,255,255,0.02) 0%, rgba(255,255,255,0.012) 100%);
  border-radius:calc(var(--radius) + 4px);
  box-shadow:var(--shadow-lg);
  pointer-events:none;
  z-index:-2;
}

/* Keep content above the central panel */
header, main, footer, .modal{position:relative;z-index:1}

/* Containers / layout */
.container{max-width:var(--content-width);margin:0 auto;padding:1.25rem 2rem}

/* Header */
.site-header{position:sticky;top:calc(var(--panel-gap) + 8px);display:flex;align-items:center;z-index:3;}
.header-inner{display:flex;align-items:center;gap:1rem}
.brand{display:flex;align-items:center;gap:.75rem;text-decoration:none;color:inherit}
.logo-mark{width:46px;height:46px;border-radius:10px;display:inline-grid;place-items:center;font-weight:700;font-family:Poppins,Inter;background:linear-gradient(135deg,var(--accent-1),var(--accent-2));color:#fff}
.brand-name{font-weight:700}
.brand-role{font-size:12px;color:var(--muted)}

/* Navigation */
.nav{margin-left:auto}
.nav-list{display:flex;gap:0.35rem;align-items:center;list-style:none;padding:0;margin:0}
.nav-list a{display:inline-block;padding:.45rem .6rem;border-radius:8px;color:var(--text);text-decoration:none;position:relative;overflow:visible}
.nav-list a::after{content:"";position:absolute;left:12%;right:12%;bottom:6px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--accent-2),var(--accent-1));opacity:0;transform:scaleX(.8);transition:opacity var(--transition),transform var(--transition)}
.nav-list a:hover::after,.nav-list a:focus::after{opacity:1;transform:scaleX(1)}

.nav-toggle{display:none;background:transparent;border:0;color:inherit;font-size:20px}

.header-actions{display:flex;align-items:center;gap:.5rem}
.icon-btn{display:inline-grid;place-items:center;border-radius:10px;border:0;background:transparent;color:inherit;padding:.35rem .5rem;cursor:pointer}

/* Buttons */
.btn{display:inline-block;padding:.6rem 1rem;border-radius:12px;text-decoration:none;color:inherit;border:1px solid rgba(255,255,255,0.06);background:transparent;cursor:pointer;transition:transform var(--transition),box-shadow var(--transition)}
.btn:focus{outline:3px solid rgba(124,58,237,0.16);outline-offset:3px}
.btn-primary{background:linear-gradient(90deg,var(--accent-2),var(--accent-1));color:white;border:0;box-shadow:0 6px 20px rgba(76,45,180,0.18)}
.btn-primary:hover{transform:translateY(-3px)}
.btn-outline{border:1px solid rgba(255,255,255,0.06)}

/* Hero */
.hero{padding:5.5rem 0 4rem}
.hero-inner{display:grid;grid-template-columns:1fr 360px;gap:2.25rem;align-items:center}
.hero-copy{max-width:56ch}
.hero-title{font-family:Poppins,Inter;font-weight:800;font-size:clamp(34px,6.5vw,56px);line-height:1.02;margin:.2rem 0}
.hero-sub{color:var(--muted);margin-top:.5rem}
.lead{margin:1rem 0 1.35rem;color:#cfe6ff}
.hero-ctas{display:flex;gap:.8rem;margin-top:.75rem}
.socials{display:flex;gap:.6rem;margin-top:1rem}

.hero-media{display:flex;justify-content:center}
.profile-card{width:320px;background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));padding:1.25rem;border-radius:14px;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;align-items:center;gap:.85rem;backdrop-filter:blur(6px)}
.avatar{width:160px;height:160px;border-radius:12px;object-fit:cover;border:2px solid rgba(255,255,255,0.04);box-shadow:0 10px 30px rgba(15,23,42,0.6);transition:transform var(--transition)}
.profile-card:hover .avatar{transform:translateY(-6px) scale(1.02)}
.profile-meta h3{margin:0;font-size:18px}
.profile-meta p{margin:0;color:var(--muted);font-size:13px}

/* Sections */
.section{padding:3rem 0}
.section h2{font-size:20px;margin:0 0 1rem}
.cards-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem;margin-top:1rem}
.card{background:var(--card-bg);padding:1.2rem;border-radius:12px;box-shadow:var(--shadow-sm);transition:transform var(--transition),box-shadow var(--transition)}
.card:hover{transform:translateY(-10px);box-shadow:0 30px 70px rgba(2,6,23,0.6)}

/* Code sample */
.code-sample{background:linear-gradient(180deg, rgba(10,16,23,0.45), rgba(8,12,20,0.35));padding:1rem;border-radius:10px;overflow:auto;border:1px solid rgba(255,255,255,0.02);color:#cfe6ff}

/* Publications */
.publications-list{list-style:none;padding:0;margin:0}
.publications-list li{padding:.6rem 0;border-bottom:1px dashed rgba(255,255,255,0.02)}
.publications-list li:last-child{border-bottom:0}

/* Contact Form */
.contact-form label{display:block;margin-bottom:.75rem}
.contact-form input,.contact-form textarea{width:100%;padding:.7rem;border-radius:10px;border:1px solid rgba(255,255,255,0.05);background:transparent;color:var(--text)}
.form-actions{display:flex;gap:.75rem;margin-top:.75rem;align-items:center}

/* Footer */
.site-footer{padding:2rem 0;color:var(--muted);text-align:center}

/* Modal */
.modal{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(2,6,23,0.6);opacity:0;pointer-events:none;transition:opacity .2s}
.modal[aria-hidden="false"]{opacity:1;pointer-events:auto}
.modal-panel{background:linear-gradient(180deg, rgba(255,255,255,0.025), rgba(255,255,255,0.01));padding:1.25rem;border-radius:12px;min-width:320px;max-width:760px;box-shadow:var(--shadow-lg)}
.modal-close{float:right;border:0;background:transparent;font-size:18px;cursor:pointer}

/* Reveal utility (used by JS) */
.reveal{opacity:0;transform:translateY(18px) scale(.995);transition:transform .7s cubic-bezier(.2,.9,.2,1),opacity .6s}
.reveal.revealed{opacity:1;transform:none}

/* Small interactive details */
a{color:inherit}
a:focus{outline:3px solid rgba(124,58,237,0.14);outline-offset:3px}

/* Mobile responsiveness */
@media (max-width:900px){
  .hero-inner{grid-template-columns:1fr;gap:1.25rem}
  .hero-media{order:-1;justify-content:flex-start}
  .nav-list{position:fixed;top:calc(var(--panel-gap) + 64px);right:0;background:linear-gradient(180deg, rgba(3,6,12,0.96), rgba(3,6,12,0.98));height:calc(100% - (var(--panel-gap) + 64px));width:280px;flex-direction:column;padding:1rem;transform:translateX(120%);transition:transform .22s}
  .site-header.nav-open .nav-list{transform:translateX(0)}
  .nav-toggle{display:block}
  .container{padding:1rem}
}

/* Light theme override */
body.light{
  color:#0b1220;
  background:linear-gradient(180deg,#f8fbff 0%, #eef6ff 100%);
}
body.light::before{filter:blur(10px) brightness(0.98)}
body.light::after{background:linear-gradient(180deg, rgba(255,255,255,0.96), rgba(250,250,250,0.95));box-shadow:0 18px 50px rgba(12,20,30,0.06)}
body.light .card, body.light .modal-panel{background:white;color:#0b1220}

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  *{animation:none!important;transition:none!important}
}