/* Responsive, accessible tweaks */
:root{
  --logo-color: var(--accent-2); /* Light blue for dark mode */
  --bg-start:#031025;
  --bg-end:#071428;
  --bg:linear-gradient(180deg,var(--bg-start) 0%, var(--bg-end) 100%);
  --card:rgba(11,18,32,0.9);
  --muted:#9aa4b2;
  --text:#e6eef6;
  --accent:#7dd3fc;
  --accent-2:#60a5fa;
  --glass:rgba(255,255,255,0.03);
  --backdrop:rgba(2,6,23,.6);
  --radius:12px;
  /* allow container to grow up to a limit, and use viewport on very large screens */
  --max-width: min(1800px, 96vw);
  --container-pad:clamp(1rem, 2.5vw, 2rem);
  --gap:1rem;
  --card-shadow:0 10px 30px rgba(2,6,23,0.35);
  --control-border: rgba(255,255,255,0.12);
  --control-border-checked: rgba(255,255,255,0.18);
  transition:background-color .35s ease,color .35s ease,border-color .35s ease,box-shadow .35s ease;
  color-scheme: dark;
}
html[data-theme="light"]{
  --logo-color: #1a4d8c; /* Dark blue for light mode */
  --bg-start:#f6f9fc;
  --bg-end:#f0f4f8;
  --bg:linear-gradient(180deg,var(--bg-start) 0%, var(--bg-end) 100%);
  --card:#ffffff;
  --muted:#556074;
  --text:#0b1220;
  --accent:#2563eb;
  --accent-2:#0ea5e9;
  --glass:rgba(2,6,23,0.04);
  --backdrop:rgba(2,6,23,0.06);
  --card-shadow:0 6px 18px rgba(2,6,23,0.06);
  --control-border: rgba(2,6,23,0.06);
  --control-border-checked: rgba(2,6,23,0.08);
  color-scheme: light;
}
*{box-sizing:border-box}
/* theme transition helper (added for smoother theme switching) */
html.theme-transition, html.theme-transition body, html.theme-transition .card, html.theme-transition .btn, html.theme-transition .nav, html.theme-transition .modal-content{transition:background-color .36s ease,color .36s ease,border-color .36s ease,box-shadow .36s ease}

/* visually hidden (screen-reader-only) */
.visually-hidden{position:absolute!important;height:1px;width:1px;overflow:hidden;clip:rect(1px,1px,1px,1px);white-space:nowrap;border:0;padding:0;margin:-1px}
html{font-size:clamp(15px,1.6vw,18px)}
html,body{height:100%}
body{
  margin:0;font-family:'Google Sans', 'Roboto', Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", "Helvetica Neue", Arial;
  background:var(--bg);
  color:var(--text);line-height:1.5;-webkit-font-smoothing:antialiased;
}
.container{max-width:var(--max-width);margin:0 auto;padding:var(--container-pad)}
.site-header{position:absolute;top:0;left:0;right:0;z-index:60;background:transparent;}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:1rem 0}
.logo{font-weight:700;text-decoration:none;color:var(--logo-color);font-size:1.05rem}
.nav ul{list-style:none;margin:0;padding:0;display:flex;gap:1rem;align-items:center}
/* nav links sit on top of hero so color should be high-contrast */
.header-inner .nav a{text-decoration:none;color:var(--text)}
.header-inner .nav a:hover{color:var(--accent-2)}
.nav .theme-item{margin-left:auto}
.nav-toggle{display:none;background:none;border:0;color:var(--accent);font-size:1.35rem;padding:.25rem;border-radius:8px}
.controls{display:flex;align-items:center;gap:.5rem}
/* accessible switch-style toggle */
.theme-toggle{width:48px;height:28px;border-radius:999px;background:var(--card);border:1px solid var(--control-border);position:relative;padding:0;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:background .18s ease,border-color .18s ease} 
.theme-toggle::after{content:'';position:absolute;left:4px;top:4px;width:20px;height:20px;background:var(--text);border-radius:50%;box-shadow:0 2px 6px rgba(0,0,0,0.12);transition:left .18s ease,background .18s ease,transform .18s ease}
.theme-toggle[aria-checked="true"]{background:linear-gradient(90deg,var(--accent),var(--accent-2));border-color:var(--control-border-checked);box-shadow:0 6px 18px rgba(2,6,23,0.12)}
.theme-toggle[aria-checked="true"]::after{left:calc(100% - 24px);background:#fff;box-shadow:0 2px 6px rgba(0,0,0,0.16)}
.theme-toggle:focus-visible{outline:3px solid rgba(125,211,252,.12);outline-offset:3px}

/* external icon next to switch */
.theme-item{display:flex;align-items:center}
.theme-icon{font-size:1.05rem;color:var(--muted);margin-left:.6rem;cursor:pointer;transition:color .18s ease}
html[data-theme="light"] .theme-icon{color:var(--accent-2)}
.theme-icon:focus{outline:none} 
/* Hero layout: responsive full-viewport band */
.hero{min-height:calc(var(--vh, 1vh) * 100);display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;padding:2.5rem 0}
.hero .container{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;position:relative;z-index:1;width:100%}

/* new wrapper for heading + role — stack on small, side-by-side on larger screens */
.hero-meta{display:flex;flex-direction:column;align-items:center;gap:.6rem}
.hero-meta h1{margin:0}
.hero-meta .role{margin:0}

/* CTA inside hero-meta sits below content by default and centers on small screens */
.hero-meta .cta{order:2;display:flex;gap:.6rem;justify-content:center;margin-top:.8rem}
.hero-meta .cta .btn{margin-right:.5rem}

.hero .name{color:var(--accent);}
.role{color:var(--muted);margin:0.5rem 0 1.25rem}

/* On wider screens, allow title and role to sit side-by-side and keep CTA beneath them */
@media(min-width:900px){
  /* keep stacked order: title, then description, then buttons; left-align on wider screens */
  .hero-meta{flex-direction:column;align-items:flex-start;gap:0.6rem}
  .hero-meta h1{order:1}
  .hero-meta .role{order:2}
  .hero-meta .cta{order:3;justify-content:flex-start;margin-top:0.6rem}
  /* if hero has two columns, keep CTA aligned with the left content */
  .hero .container{grid-template-columns:1fr 360px;text-align:left}
}

/* ensure the CTA looks balanced on very large screens */
@media(min-width:1600px){
  .hero-meta .cta{margin-top:1rem}
}

#constellation-canvas{
  position:absolute;
  inset:0;
  z-index:-1;
  pointer-events:none;
}

@media(min-width:900px){
  .hero .container{display:grid;grid-template-columns:1fr 360px;align-items:center;gap:2rem;text-align:left}
}


.btn{display:inline-block;background:linear-gradient(90deg,var(--accent),var(--accent-2));color:#022; padding:.5rem .9rem;border-radius:8px;text-decoration:none;font-weight:600}
/* ensure gradient buttons have white text in light theme for contrast */
html[data-theme="light"] .btn{ color: #ffffff; }
/* outline buttons should remain transparent and use the accent color in all themes */
.btn.outline{background:transparent;border:1px solid rgba(125,211,252,0.12);color:var(--accent)}
html[data-theme="light"] .btn.outline{ color: var(--accent); border-color: rgba(37,99,235,0.12); }
.btn.small{padding:.35rem .6rem;font-size:.9rem}

.about p, .contact p {font-size:clamp(1rem,1.25vw,1.45rem)}

.about{padding:2rem 0; background: var(--projects-bg); }
.projects{padding:2rem 0}
/* fluid grid responsive to available space */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:var(--gap)}
 .card{background:var(--card);padding:1rem;border-radius:var(--radius);border:1px solid var(--glass);box-shadow:var(--card-shadow-sm);backdrop-filter:blur(6px);transition:box-shadow .18s ease,transform .18s ease,border-color .18s ease}
.card h3{margin:0 0 .25rem;color:var(--text);font-weight:600}
.card p{margin:0 0 .75rem;color:var(--muted)}

/* projects band and styles */
:root{
  --projects-bg: linear-gradient(180deg,#071428 0%, #051526 100%);
  --project-card-bg: rgba(255,255,255,0.03);
  --project-card-border: rgba(255,255,255,0.06);
}
html[data-theme="light"]{
  --projects-bg: linear-gradient(180deg,#f4f8ff 0%, #eef6ff 100%);
  --project-card-bg: #ffffff;
  --project-card-border: rgba(2,6,23,0.06);
}

.projects{background:var(--projects-bg);padding:clamp(2rem,4vw,4rem) 0}
.projects .container{padding-left:var(--container-pad);padding-right:var(--container-pad)}
.projects h2{color:var(--text);margin-bottom:1rem}

/* cards in projects band */
#projects-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1.25rem}
#projects-grid .card{background:var(--project-card-bg);border:1px solid var(--project-card-border);box-shadow:0 8px 24px rgba(2,6,23,0.12);padding:1.25rem;border-radius:12px;color:var(--card-text, var(--text));transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}
#projects-grid .card h3{margin:0 0 .5rem;font-size:1.05rem}
#projects-grid .card p{margin:0 0 .85rem;color:var(--muted);font-size:clamp(1rem,1.25vw,1.45rem)}
#projects-grid .card .btn{margin-top:.5rem}
#projects-grid .card:hover{transform:translateY(-6px);box-shadow:0 18px 44px rgba(2,6,23,0.16)}

/* make sure reveal animation still works here */
#projects-grid .reveal{opacity:0;transform:translateY(12px);}
#projects-grid .reveal.in-view{opacity:1;transform:none}

.contact{padding:2rem 0; background: var(--projects-bg); }
.site-footer{padding:2rem 0;text-align:center;color:var(--muted)}

/* modal improvements */
.modal.hidden{display:none}
.modal{position:fixed;inset:0;display:flex;align-items:center;justify-content:center}
.modal-backdrop{position:absolute;inset:0;background:linear-gradient(0deg,var(--backdrop),var(--backdrop))}
.modal-content{position:relative;z-index:2;background:var(--card);padding:1.25rem;border-radius:12px;max-width:640px;width:min(96%,640px);box-shadow:0 8px 30px rgba(2,6,23,.8);max-height:calc(100vh - 3rem);overflow:auto}
.close{position:absolute;right:10px;top:10px;background:transparent;border:0;color:var(--muted);font-size:1.2rem}

/* reveal animation */
.reveal{opacity:0;transform:translateY(12px) scale(.995);will-change:opacity,transform;--reveal-duration:.6s;--reveal-ease:cubic-bezier(.2,.9,.2,1);--delay:0ms;transition:opacity var(--reveal-duration) var(--reveal-ease) var(--delay),transform var(--reveal-duration) var(--reveal-ease) var(--delay)}
.reveal.in-view{opacity:1;transform:translateY(0) scale(1)}
@keyframes hero-fly-in{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
.hero .reveal.in-view{animation:hero-fly-in var(--reveal-duration) var(--reveal-ease) both}

/* card micro-interactions */
#projects-grid .card .btn{transition:transform .18s ease,box-shadow .18s ease}
#projects-grid .card:hover .btn{transform:translateY(-3px);box-shadow:0 8px 18px rgba(2,6,23,0.12)}
#projects-grid .card .card-meta{opacity:.9;color:var(--muted);font-size:.9rem;margin-top:.5rem}
#projects-grid .card:focus-within{box-shadow:0 20px 50px rgba(2,6,23,0.18);transform:translateY(-4px)}

@media (min-width:1200px){
  .container{padding:calc(var(--container-pad) + 1rem)}
  .hero{padding:6rem 0}

  /* larger hero typography for wide desktop and web views */
  .hero h1{font-size:clamp(2.4rem,3.6vw,4.4rem);line-height:1.03;margin-bottom:.25rem}
  .hero .role{font-size:clamp(1rem,1.25vw,1.45rem);margin-bottom:1.25rem}
  .cta .btn{padding:.7rem 1.1rem;font-size:1rem}

  .grid{gap:1.25rem}
  /* more columns on large (1080p+) screens */
  .grid{grid-template-columns:repeat(4,1fr)}
}

/* extra-large screens: make hero text even more impactful */
@media (min-width:1600px){
  .hero h1{font-size:clamp(3.2rem,2.8vw,5.2rem)}
  .hero .role{font-size:clamp(1.15rem,1.2vw,1.6rem)}
  .cta .btn{padding:.8rem 1.25rem;font-size:1.02rem}
}

/* small screens: adjust nav and layout */
@media (max-width:900px){
  .grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
  /* center About, Contact, and Projects content on tablet and smaller screens */
  .about, .contact, .projects { text-align: center; }
  .about h2, .contact h2, .projects h2 { text-align: center; }
  .about p, .contact p, .projects p { margin-left: auto; margin-right: auto; max-width: 58ch; }
  /* center project card contents */
  .projects .card { text-align: center; }
  .projects .card p { margin-left: auto; margin-right: auto; }
}
@media (max-width:640px){
  .header-inner{padding: 1.5rem 0;} /* Bigger navbar */
  .logo{font-size: 1.8rem; margin-left: 1rem;} /* Smaller size, left margin */
  .grid{grid-template-columns:1fr}
  .nav{
    display: none;
    position: fixed;
    inset: 0;
    background: var(--bg);
    z-index: 100;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }
  .nav.open{
    display: flex;
  }
  .nav ul{
    flex-direction:column;
    gap: 1.5rem;
    font-size: 1.5rem;
    text-align: center;
  }
  .nav-toggle{
    display:block;
    z-index: 101;
    position: relative; /* Ensure z-index is applied */
    font-size: 1.5rem; /* Smaller hamburger/close button */
    margin-right: 1rem;
  }
  .hero .container{text-align:center}
  .modal-content{width:calc(100% - 2rem);border-radius:10px;padding:1rem}
}


/* Focus & accessibility polish */
:focus{outline-offset:3px}
:focus-visible{outline:3px solid rgba(96,165,250,.18);border-radius:8px}
.nav a:focus-visible,.btn:focus-visible,.nav-toggle:focus-visible,.close:focus-visible{outline:3px solid rgba(125,211,252,.14)}

/* small polish */
a:hover{opacity:.95}
.card:hover{transform:translateY(-6px);box-shadow:var(--card-shadow);transition:transform .2s,box-shadow .2s}

body.body-no-scroll {
  overflow: hidden;
}