/* ============================================================
   GLOBAL STYLESHEET — MUHAMMAD IRTAZA PORTFOLIO (SINGLE PAGE)
   Palette/font matched to reference: Satoshi + blue/slate system
   Type scale: all font-sizes sit on a 0.05rem grid (no odd decimals)
   ============================================================ */

:root {
  /* -- primary (blue) scale -- */
  --p50:  #f5f9ff;
  --p100: #d0e1fd;
  --p200: #abc9fb;
  --p300: #85b2f9;
  --p400: #609af8;
  --p500: #3b82f6;
  --p600: #326fd1;
  --p700: #295bac;
  --p800: #204887;
  --p900: #183462;

  /* -- surface (slate) scale -- */
  --s0:   #ffffff;
  --s50:  #f8fafc;
  --s100: #f1f5f9;
  --s200: #e2e8f0;
  --s300: #cbd5e1;
  --s400: #94a3b8;
  --s500: #64748b;
  --s600: #475569;
  --s700: #334155;
  --s800: #1e293b;
  --s900: #0f172a;

  --bg:            var(--s50);
  --bg-card:       var(--s0);
  --bg-subtle:     var(--s100);
  --border:        var(--s200);
  --border-hover:  var(--s300);
  --ink:           var(--s900);
  --ink-title:     var(--s800);
  --ink-soft:      var(--s600);
  --ink-dim:       var(--s500);

  --primary:        var(--p600);
  --primary-strong:  var(--p700);
  --primary-loud:    var(--p500);
  --primary-soft:    var(--p50);
  --primary-border:  rgba(59,130,246,0.28);
  --primary-shadow:  rgba(59,130,246,0.16);
  --primary-glow:    rgba(59,130,246,0.08);

  --green: #10b981;
  --chip-bg:   var(--s100);
  --chip-text: var(--s700);

  --shadow-sm:    0 1px 3px rgba(0,0,0,0.05);
  --shadow-md:    0 4px 20px -2px rgba(0,0,0,0.07), 0 2px 6px -1px rgba(0,0,0,0.03);
  --shadow-hover: 0 12px 32px -4px var(--primary-shadow), 0 4px 12px -2px rgba(0,0,0,0.04);

  --r-sm: 6px; --r-md: 12px; --r-lg: 16px; --r-pill: 999px;
  --sans: 'Satoshi', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --ease: cubic-bezier(.16,1,.3,1);
  --t: all .25s var(--ease);
  --max-w: 1080px;
}

html[data-theme="dark"] {
  --bg:           var(--s900);
  --bg-card:      var(--s800);
  --bg-subtle:    #172236;
  --border:       #334155;
  --border-hover: #475569;
  --ink:          #f8fafc;
  --ink-title:    #f1f5f9;
  --ink-soft:     #94a3b8;
  --ink-dim:      #64748b;

  --primary:        var(--p400);
  --primary-strong:  var(--p300);
  --primary-loud:    var(--p400);
  --primary-soft:    rgba(59,130,246,0.14);
  --primary-border:  rgba(96,154,248,0.32);
  --primary-shadow:  rgba(96,154,248,0.3);
  --primary-glow:    rgba(96,154,248,0.14);

  --chip-bg:   var(--s900);
  --chip-text: #cbd5e1;
  --shadow-sm:    0 1px 3px rgba(0,0,0,0.35);
  --shadow-md:    0 4px 20px -2px rgba(0,0,0,0.45);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color .4s, color .3s;
  /* light, viewport-anchored gradient — visible at any scroll position, kept subtle */
  background-color: var(--bg);
  background-image: radial-gradient(circle at 70% 30%, var(--primary-glow) 0%, transparent 55%);
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-size: 140% 140%;
  animation: bgDrift 16s ease infinite;
}
@keyframes bgDrift {
  0%,100% { background-position: 70% 30%; }
  50%     { background-position: 30% 60%; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; }
}

::-webkit-scrollbar { width: 7px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary); }
::selection { background: var(--primary); color: #fff; }

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

.skip-link {
  position: absolute; left: 12px; top: -50px; z-index: 200;
  background: var(--primary); color: #fff; padding: 10px 16px;
  border-radius: var(--r-sm); font-weight: 700; font-size: .85rem;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---- SITE HEADER (shrunk — single page, no back nav) ---- */
header.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid transparent;
  padding: 10px 0;
  transition: var(--t), border-color .3s;
}
header.site-header.scrolled { border-bottom-color: var(--border); background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(8px); }
.nav-wrapper { display: flex; align-items: center; justify-content: space-between; gap: 12px; }

.nav-logo { display: flex; align-items: center; gap: 9px; font-weight: 600; font-size: 1.1rem; color: var(--ink); flex-shrink: 0; }
.nav-logo-img, .footer-logo-img { height: 30px; width: auto; object-fit: contain; filter: none !important; }
.nav-logo-name { font-size: 1.05rem; font-weight: 600; color: var(--ink); line-height: 1; white-space: nowrap; }
.nav-logo-name span { color: var(--primary); }

.nav-menu { display: flex; align-items: center; gap: 20px; }
.nav-link { font-size: .85rem; font-weight: 600; color: var(--ink-soft); transition: var(--t); white-space: nowrap; }
.nav-link:hover, .nav-link:focus-visible { color: var(--primary); }
.nav-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

/* Toggle stays legible even if the icon font fails to load: filled circle + always-on shadow */
.icon-btn {
  width: 36px; height: 36px; border-radius: 50%; border: 1px solid var(--border);
  background: var(--bg-card); color: var(--ink); cursor: pointer;
  display: flex; align-items: center; justify-content: center; font-size: .9rem; transition: var(--t);
  flex-shrink: 0; box-shadow: var(--shadow-sm);
}
.icon-btn:hover, .icon-btn:focus-visible { border-color: var(--primary); color: var(--primary); }

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 10px 20px;
  border-radius: var(--r-sm); border: 1px solid var(--border); background: var(--bg-card);
  color: var(--ink); font-size: .9rem; font-weight: 600; cursor: pointer; transition: var(--t);
}
.btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); transform: translateY(-2px); }
.btn-blue { background: var(--primary-soft); border-color: var(--primary-border); color: var(--primary); }
.btn-blue:hover { background: var(--primary); border-color: var(--primary); color: #fff; transform: translateY(-2px); }
.btn-solid { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-solid:hover { background: var(--primary-strong); border-color: var(--primary-strong); color: #fff; transform: translateY(-2px); }
.btn:focus-visible, .icon-btn:focus-visible, a:focus-visible, button:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* ---- HERO ---- */
.hero-section { position: relative; overflow: hidden; padding: 48px 0 32px; }
.hero-layout { display: grid; grid-template-columns: 1fr 220px; gap: 40px; align-items: flex-start; position: relative; z-index: 1; }
.hero-title { font-size: clamp(2.6rem,6vw,4.25rem); font-weight: 800; color: var(--primary); line-height: 1.05; letter-spacing: -.02em; margin-bottom: 8px; }
.hero-subtitle { font-size: 1.4rem; font-weight: 600; color: var(--ink-title); margin-bottom: 18px; }
.status-chip { display: inline-flex; align-items: center; gap: 7px; padding: 5px 14px; border-radius: var(--r-pill); background: rgba(16,185,129,.1); border: 1px solid rgba(16,185,129,.3); color: var(--green); font-size: .8rem; font-weight: 600; margin-bottom: 16px; }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); animation: blip 2.2s ease-in-out infinite; }
@keyframes blip { 0%,100%{opacity:1;} 50%{opacity:.35;} }

.hero-bio { font-size: 1.05rem; font-weight: 500; color: var(--ink-soft); line-height: 1.7; margin-bottom: 20px; }
.hero-bio p { margin-bottom: 10px; }
.hero-bio p:last-child { margin-bottom: 0; }
.hero-action-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }

/* Bigger avatar with a soft light glow behind it (no extra markup — shadow paints outside overflow:hidden) */
.hero-avatar {
  width: 240px; height: 240px; border-radius: 50%; overflow: hidden;
  border: 4px solid var(--border); margin-top: 8px; flex-shrink: 0;
  box-shadow: 0 0 0 10px var(--primary-glow), 0 0 40px 8px var(--primary-glow), var(--shadow-md);
}
.hero-avatar img { width: 100%; height: 100%; object-fit: cover; object-position: center top; }

/* ---- SECTION HEADERS ---- */
.section-wrap { padding: 40px 0 56px; }
.section-wrap + .section-wrap { border-top: 1px solid var(--border); }
.section-title { font-size: 1.9rem; font-weight: 700; color: var(--primary); margin-bottom: 6px; letter-spacing: -.01em; }
.section-sub { font-size: .95rem; color: var(--ink-soft); margin-bottom: 26px; }

/* ---- SKILLS ---- */
.skills-grid { display: flex; flex-wrap: wrap; gap: 10px; }
.skill-pill { display: inline-flex; align-items: center; gap: 8px; padding: 9px 16px; border-radius: var(--r-sm); background: var(--bg-card); border: 1px solid var(--border); font-size: .9rem; font-weight: 500; color: var(--ink-soft); box-shadow: var(--shadow-sm); transition: var(--t); }
.skill-pill i { color: var(--primary); font-size: .95rem; }
.skill-pill:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }

/* ---- PROJECTS (3-up rectangular cards) ---- */
.projects-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.project-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r-md); overflow: hidden; box-shadow: var(--shadow-sm); display: flex; flex-direction: column; transition: var(--t); }
.project-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--primary); }

.browser-bar { display: flex; align-items: center; gap: 6px; padding: 8px 10px; background: var(--bg-subtle); border-bottom: 1px solid var(--border); }
.browser-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--border); flex-shrink: 0; }
.browser-url {
  flex: 1; margin-left: 6px; display: flex; align-items: center; justify-content: space-between; gap: 6px;
  font-size: .7rem; color: var(--ink-dim); background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 3px; padding: 4px 9px; white-space: nowrap; overflow: hidden; transition: var(--t);
}
.browser-url span { overflow: hidden; text-overflow: ellipsis; }
.browser-url i { font-size: .7rem; flex-shrink: 0; color: var(--ink-dim); transition: var(--t); }
.browser-url:hover, .browser-url:focus-visible { color: var(--primary); border-color: var(--primary-border); }
.browser-url:hover i, .browser-url:focus-visible i { color: var(--primary); transform: translate(1px,-1px); }

.project-img-box { position: relative; height: 170px; background: var(--bg-subtle); overflow: hidden; border-bottom: 1px solid var(--border); }
.project-img-box img { width: 100%; height: 100%; object-fit: cover; object-position: top; transition: transform .5s ease; }
.project-card:hover .project-img-box img { transform: scale(1.03); }

.img-fallback { width: 100%; height: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; color: var(--ink-dim); font-size: .7rem; text-align: center; padding: 20px; }
.img-fallback-mark { width: 40px; height: 40px; border-radius: var(--r-sm); border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; font-size: .8rem; font-weight: 700; color: var(--ink-dim); }

.project-head { padding: 16px 18px 6px; }
.project-name { font-size: 1.1rem; font-weight: 600; color: var(--ink-title); }

.project-body { padding: 0 18px 18px; display: flex; flex-direction: column; flex: 1; }
.project-desc { font-size: .9rem; color: var(--ink-soft); line-height: 1.55; margin-bottom: 14px; flex: 1; }
.chips-row { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { font-size: .7rem; font-weight: 600; padding: 3px 10px; border-radius: var(--r-pill); background: var(--chip-bg); color: var(--chip-text); border: 1px solid var(--border); }

/* ---- OPEN SOURCE ---- */
.os-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 14px; }
.os-card { padding: 18px 20px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r-md); display: flex; align-items: center; justify-content: space-between; gap: 12px; transition: var(--t); }
.os-card:hover { border-color: var(--primary); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.os-title { font-size: 1rem; font-weight: 600; color: var(--ink-title); margin-bottom: 4px; }
.os-desc { font-size: .85rem; color: var(--ink-soft); }
.os-icon { font-size: 1.3rem; color: var(--ink-dim); flex-shrink: 0; }

/* ---- LOAD MORE ---- */
.load-more-row { display: flex; justify-content: center; margin-top: 22px; }
.load-more-btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 8px 18px; border-radius: var(--r-pill);
  border: 1px solid var(--border); background: var(--bg-card);
  font-size: .8rem; font-weight: 600; color: var(--ink-soft);
  cursor: pointer; transition: var(--t);
}
.load-more-btn:hover, .load-more-btn:focus-visible { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }
.load-more-btn i { font-size: .75rem; transition: transform .25s var(--ease); }

/* ---- EXPERIENCE (2-column, short info, no image) ---- */
.exp-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 18px; }
.exp-card { padding: 20px 22px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r-md); box-shadow: var(--shadow-sm); transition: var(--t); }
.exp-card:hover { border-color: var(--primary); box-shadow: var(--shadow-hover); }
.exp-role-row { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; margin-bottom: 4px; }
.exp-role { font-size: 1rem; font-weight: 600; color: var(--ink-title); }
.exp-date { font-size: .75rem; color: var(--ink-dim); background: var(--bg-subtle); padding: 3px 10px; border-radius: var(--r-pill); white-space: nowrap; flex-shrink: 0; }
.exp-company { font-size: .9rem; color: var(--primary); font-weight: 600; margin-bottom: 8px; }
.exp-summary { font-size: .85rem; color: var(--ink-soft); line-height: 1.55; }

/* ---- CERTIFICATES (photo cards, like projects) ---- */
.certs-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.cert-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r-md); overflow: hidden; box-shadow: var(--shadow-sm); transition: var(--t); }
.cert-card:hover { border-color: var(--primary); transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.cert-img-box { position: relative; height: 140px; background: var(--bg-subtle); overflow: hidden; border-bottom: 1px solid var(--border); }
.cert-img-box img { width: 100%; height: 100%; object-fit: cover; object-position: top; transition: transform .5s ease; }
.cert-card:hover .cert-img-box img { transform: scale(1.03); }
.cert-body { padding: 16px 18px 18px; display: flex; align-items: flex-start; gap: 12px; }
.cert-icon { width: 38px; height: 38px; border-radius: var(--r-sm); background: var(--primary-soft); border: 1px solid var(--primary-border); display: flex; align-items: center; justify-content: center; color: var(--primary); font-size: 1.05rem; flex-shrink: 0; }
.cert-name { font-size: .95rem; font-weight: 600; color: var(--ink-title); margin-bottom: 3px; }
.cert-issuer { font-size: .8rem; color: var(--primary); font-weight: 600; }

/* ---- LOCATION ---- */
.location-card { padding: 26px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r-lg); box-shadow: var(--shadow-sm); }
.map-wrap { margin-top: 14px; width: 100%; height: 260px; border-radius: var(--r-md); overflow: hidden; border: 1px solid var(--border); }
.map-wrap iframe { width: 100%; height: 100%; border: 0; }

/* ---- CONTACT ---- */
.contact-card { padding: 36px; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--r-lg); box-shadow: var(--shadow-md); }
.contact-btn-row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-bottom: 22px; }
.social-row { display: flex; gap: 10px; margin-top: 16px; }

/* ---- FOOTER (shrunk — copyright line only) ---- */
footer.site-footer { border-top: 1px solid var(--border); padding: 20px 0; background: var(--bg-card); }
.footer-copy { font-size: .75rem; color: var(--ink-dim); text-align: center; }

/* ---- SPLASH SCREEN ---- */
#splash-screen {
  position: fixed; inset: 0; z-index: 9999;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg);
  transition: opacity .5s var(--ease), visibility .5s var(--ease);
}
#splash-screen.splash-hide { opacity: 0; visibility: hidden; pointer-events: none; }
.splash-inner { display: flex; flex-direction: column; align-items: center; gap: 16px; }
.splash-logo { height: 46px; width: auto; object-fit: contain; filter: none !important; animation: splashPulse 1.4s ease-in-out infinite; }
.splash-dots { display: flex; align-items: center; gap: 6px; }
.splash-dots span { width: 6px; height: 6px; border-radius: 50%; background: var(--primary); animation: splashBlip 1s ease-in-out infinite; }
.splash-dots span:nth-child(2) { animation-delay: .15s; }
.splash-dots span:nth-child(3) { animation-delay: .3s; }
@keyframes splashPulse { 0%,100% { opacity: .55; transform: scale(.96); } 50% { opacity: 1; transform: scale(1); } }
@keyframes splashBlip { 0%,80%,100% { opacity: .25; transform: scale(.8); } 40% { opacity: 1; transform: scale(1); } }

/* ---- LIGHTBOX ---- */
.lb-trigger { cursor: zoom-in; }

.lb-overlay {
  position: fixed; inset: 0; z-index: 10000;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,0.78);
  backdrop-filter: blur(6px);
  padding: 24px;
  animation: lbFadeIn .2s var(--ease);
  outline: none;
}
@keyframes lbFadeIn { from { opacity: 0; } to { opacity: 1; } }

.lb-frame {
  position: relative;
  max-width: min(90vw, 900px);
  max-height: 85vh;
  border-radius: var(--r-md);
  overflow: hidden;
  box-shadow: 0 24px 64px rgba(0,0,0,0.5);
  animation: lbScaleIn .22s var(--ease);
}
@keyframes lbScaleIn { from { transform: scale(.94); opacity: 0; } to { transform: scale(1); opacity: 1; } }

.lb-img {
  display: block;
  max-width: 100%;
  max-height: 85vh;
  width: auto;
  height: auto;
  object-fit: contain;
}

.lb-close {
  position: fixed; top: 16px; right: 20px;
  width: 44px; height: 44px; border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.25);
  background: rgba(255,255,255,0.12);
  color: #fff; font-size: 1.5rem; line-height: 1;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: background .2s;
  z-index: 10001;
}
.lb-close:hover, .lb-close:focus-visible { background: rgba(255,255,255,0.28); outline: none; }

/* cert/project fallback: "On its way…" label */
.img-fallback-label {
  font-size: .8rem; font-weight: 600;
  color: var(--ink-dim);
  font-style: italic;
  letter-spacing: .01em;
}

/* ---- RESPONSIVE ---- */
@media(max-width:900px){
  .exp-grid { grid-template-columns: 1fr; }
  .projects-grid, .certs-grid { grid-template-columns: repeat(2,1fr); }
}
@media(max-width:768px){
  .container { padding: 0 16px; }
  .hero-layout { grid-template-columns: 1fr; }
  .hero-avatar { order: -1; margin: 0 auto 20px; width: 180px; height: 180px; }
  .projects-grid, .certs-grid, .os-grid, .skills-grid { grid-template-columns: 1fr; }
  .nav-menu { display: none; }
  /* Theme toggle is the only header control left on mobile — keep it a comfortable tap target */
  .nav-actions { margin-left: auto; }
  .icon-btn { width: 42px; height: 42px; font-size: 1rem; border-color: var(--border-hover); }
}
@media(max-width:580px){
  header.site-header { padding: 10px 0; }
  .nav-logo-name { font-size: 1rem; }
  .nav-logo-img { height: 26px; }
  .hero-title { font-size: 2rem; }
  .hero-subtitle { font-size: 1.1rem; }
  .btn { padding: 9px 16px; font-size: .85rem; }
}