/* ========================================================
   Durgaprasad Panduru — Portfolio
   Theme: Light, professional, AWS/DevOps inspired
   Palette:
     --bg:        #F6F8FB  (soft cloud grey-blue)
     --surface:   #FFFFFF
     --ink:       #11202E  (deep navy-charcoal, headings)
     --muted:     #5A6B7B  (body copy / secondary)
     --line:      #E3E9EF  (hairline borders)
     --navy:      #0B2545  (primary)
     --teal:      #0E8C8C  (accent / signature)
     --amber:     #D98E04  (status / certs highlight, used sparingly)
   ======================================================== */

:root{
  --bg:#F6F8FB;
  --surface:#FFFFFF;
  --ink:#11202E;
  --muted:#5A6B7B;
  --line:#E3E9EF;
  --navy:#0B2545;
  --navy-2:#15335E;
  --teal:#0E8C8C;
  --teal-light:#E6F5F4;
  --amber:#D98E04;
  --amber-light:#FCF1DC;
  --radius:14px;
  --maxw:1080px;
  --shadow:0 1px 2px rgba(17,32,46,0.04), 0 8px 24px rgba(17,32,46,0.06);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:'Sora',sans-serif;
  color:var(--navy);
  margin:0 0 0.5em 0;
  line-height:1.2;
  letter-spacing:-0.01em;
}
p{margin:0 0 1em 0;color:var(--muted);}
a{color:var(--teal);text-decoration:none;}
a:hover{text-decoration:underline;}
img{max-width:100%;display:block;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;}

/* ---------- Skip link / focus ---------- */
.skip-link{
  position:absolute;left:-999px;top:auto;
  background:var(--navy);color:#fff;padding:8px 16px;border-radius:8px;z-index:999;
}
.skip-link:focus{left:16px;top:16px;}
a:focus-visible, button:focus-visible, .navlink:focus-visible{
  outline:2px solid var(--teal);
  outline-offset:3px;
  border-radius:4px;
}

/* ---------- Header / Nav ---------- */
header.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(246,248,251,0.92);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--line);
}
.nav-wrap{
  max-width:var(--maxw);margin:0 auto;padding:14px 24px;
  display:flex;align-items:center;justify-content:space-between;
}
.brand{
  display:flex;align-items:center;gap:10px;
  font-family:'Sora',sans-serif;font-weight:600;color:var(--navy);
  font-size:1.05rem;
}
.brand .mark{
  width:34px;height:34px;border-radius:9px;
  background:linear-gradient(135deg,var(--navy),var(--teal));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:700;font-size:0.85rem;font-family:'Sora',sans-serif;
  letter-spacing:0;
}
nav.primary-nav ul{
  display:flex;gap:6px;list-style:none;margin:0;padding:0;
}
.navlink{
  color:var(--navy);font-weight:500;font-size:0.92rem;
  padding:8px 13px;border-radius:8px;display:inline-block;
}
.navlink:hover{background:var(--teal-light);text-decoration:none;color:var(--teal);}
.navlink.active{background:var(--navy);color:#fff;}
.navlink.active:hover{color:#fff;}

.nav-toggle{
  display:none;background:none;border:1px solid var(--line);border-radius:8px;
  width:42px;height:38px;align-items:center;justify-content:center;cursor:pointer;
}
.nav-toggle span, .nav-toggle::before, .nav-toggle::after{display:none;}
.nav-toggle .bars{display:flex;flex-direction:column;gap:4px;}
.nav-toggle .bars i{width:20px;height:2px;background:var(--navy);display:block;border-radius:2px;}

@media (max-width: 760px){
  .nav-toggle{display:flex;}
  nav.primary-nav{
    position:fixed;inset:0 0 0 30%;
    background:var(--surface);
    transform:translateX(100%);
    transition:transform .25s ease;
    box-shadow:-10px 0 30px rgba(0,0,0,0.12);
    padding:90px 20px 20px;
    z-index:99;
  }
  nav.primary-nav.open{transform:translateX(0);}
  nav.primary-nav ul{flex-direction:column;gap:4px;}
  .navlink{display:block;padding:12px 14px;}
  .nav-backdrop{
    display:none;position:fixed;inset:0;background:rgba(11,37,69,0.35);z-index:98;
  }
  .nav-backdrop.open{display:block;}
}

/* ---------- Hero ---------- */
.hero{
  padding:64px 0 56px;
  background:
    radial-gradient(circle at 85% -10%, rgba(14,140,140,0.12), transparent 55%),
    radial-gradient(circle at -5% 110%, rgba(11,37,69,0.08), transparent 55%);
}
.hero-grid{
  display:grid;grid-template-columns:1.3fr 0.9fr;gap:48px;align-items:center;
}
@media (max-width:820px){.hero-grid{grid-template-columns:1fr;text-align:center;}}

.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:0.78rem;font-weight:600;letter-spacing:0.08em;text-transform:uppercase;
  color:var(--teal);background:var(--teal-light);
  padding:6px 12px;border-radius:999px;margin-bottom:18px;
}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--teal);}

.hero h1{font-size:2.5rem;max-width:620px;}
@media (max-width:820px){.hero h1{margin-left:auto;margin-right:auto;}}
.hero .lede{font-size:1.08rem;max-width:560px;color:var(--muted);}
@media (max-width:820px){.hero .lede{margin-left:auto;margin-right:auto;}}

.cta-row{display:flex;gap:12px;margin-top:24px;flex-wrap:wrap;}
@media (max-width:820px){.cta-row{justify-content:center;}}

.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 20px;border-radius:10px;font-weight:600;font-size:0.94rem;
  border:1px solid transparent;cursor:pointer;
}
.btn-primary{background:var(--navy);color:#fff;}
.btn-primary:hover{background:var(--navy-2);text-decoration:none;}
.btn-ghost{background:var(--surface);color:var(--navy);border-color:var(--line);}
.btn-ghost:hover{border-color:var(--teal);color:var(--teal);text-decoration:none;}

/* Avatar */
.avatar-card{
  background:var(--surface);border:1px solid var(--line);border-radius:18px;
  padding:28px;text-align:center;box-shadow:var(--shadow);
}
.avatar-photo{
  width:148px;height:148px;border-radius:50%;
  margin:0 auto 18px;
  background:linear-gradient(135deg,var(--navy),var(--teal));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-family:'Sora',sans-serif;font-weight:700;font-size:2.6rem;
  border:4px solid var(--surface);box-shadow:0 0 0 4px var(--teal-light);
  overflow:hidden;
}
.avatar-photo img{width:100%;height:100%;object-fit:cover;}
.avatar-card h3{margin-bottom:2px;font-size:1.1rem;}
.avatar-card .role{color:var(--teal);font-weight:600;font-size:0.88rem;margin-bottom:14px;}
.avatar-meta{
  display:flex;flex-direction:column;gap:8px;text-align:left;
  border-top:1px solid var(--line);padding-top:14px;margin-top:6px;
  font-size:0.86rem;color:var(--muted);
}
.avatar-meta span svg{vertical-align:-3px;margin-right:6px;}

/* ---------- Sections ---------- */
.section{padding:56px 0;}
.section-tight{padding:40px 0;}
.section-head{margin-bottom:32px;max-width:640px;}
.section-head .eyebrow{margin-bottom:12px;}
.section-head h2{font-size:1.85rem;}
.alt{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}

/* ---------- Cards / Grid ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;}
@media (max-width:820px){.grid-3{grid-template-columns:1fr 1fr;}.grid-2{grid-template-columns:1fr;}}
@media (max-width:560px){.grid-3{grid-template-columns:1fr;}}

.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:24px;box-shadow:var(--shadow);
}
.card h3{font-size:1.05rem;margin-bottom:8px;}
.card p{margin-bottom:0;font-size:0.93rem;}

/* Stat strip */
.stat-strip{
  display:grid;grid-template-columns:repeat(4,1fr);gap:20px;
  margin-top:40px;
}
@media (max-width:760px){.stat-strip{grid-template-columns:repeat(2,1fr);}}
.stat{
  background:var(--surface);border:1px solid var(--line);border-radius:12px;
  padding:18px;text-align:center;
}
.stat .num{font-family:'Sora',sans-serif;font-weight:700;font-size:1.7rem;color:var(--navy);}
.stat .label{font-size:0.78rem;color:var(--muted);text-transform:uppercase;letter-spacing:0.04em;}

/* ---------- Skills page ---------- */
.skill-group{margin-bottom:28px;}
.skill-group h3{
  font-size:0.95rem;text-transform:uppercase;letter-spacing:0.06em;
  color:var(--teal);margin-bottom:14px;
}
.pill-row{display:flex;flex-wrap:wrap;gap:10px;}
.pill{
  background:var(--teal-light);color:var(--navy);
  padding:8px 14px;border-radius:999px;font-size:0.86rem;font-weight:500;
  border:1px solid rgba(14,140,140,0.18);
}

/* ---------- Experience / Timeline ---------- */
.timeline{border-left:2px solid var(--line);margin-left:6px;padding-left:32px;}
.tl-item{position:relative;margin-bottom:44px;}
.tl-item:last-child{margin-bottom:0;}
.tl-item::before{
  content:"";position:absolute;left:-39px;top:4px;
  width:14px;height:14px;border-radius:50%;
  background:var(--surface);border:3px solid var(--teal);
}
.tl-head{display:flex;justify-content:space-between;flex-wrap:wrap;gap:6px;align-items:baseline;}
.tl-head h3{margin-bottom:0;font-size:1.12rem;}
.tl-date{
  font-size:0.8rem;font-weight:600;color:var(--teal);
  background:var(--teal-light);padding:4px 10px;border-radius:999px;white-space:nowrap;
}
.tl-org{color:var(--muted);font-weight:500;font-size:0.92rem;margin:2px 0 12px;}
.tl-item ul{margin:0;padding-left:20px;color:var(--muted);font-size:0.93rem;}
.tl-item li{margin-bottom:7px;}

/* ---------- Projects ---------- */
.project-card{
  background:var(--surface);border:1px solid var(--line);border-radius:18px;
  padding:0;overflow:hidden;box-shadow:var(--shadow);margin-bottom:28px;
}
.project-top{
  background:linear-gradient(120deg,var(--navy),var(--navy-2) 60%, var(--teal));
  padding:26px 28px;color:#fff;
}
.project-top .tag{
  display:inline-block;font-size:0.74rem;font-weight:700;letter-spacing:0.06em;
  text-transform:uppercase;background:rgba(255,255,255,0.16);
  padding:5px 11px;border-radius:999px;margin-bottom:10px;
}
.project-top h3{color:#fff;font-size:1.3rem;margin-bottom:4px;}
.project-top .role{color:rgba(255,255,255,0.85);font-size:0.92rem;font-weight:500;}
.project-body{padding:26px 28px;}
.project-body ul{margin:0;padding-left:20px;color:var(--muted);font-size:0.93rem;columns:1;}
.project-body li{margin-bottom:10px;}
@media (min-width:760px){.project-body ul{columns:2;column-gap:28px;}}
.stack-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;padding-top:18px;border-top:1px solid var(--line);}
.stack-chip{
  font-size:0.78rem;font-weight:600;color:var(--navy);background:var(--bg);
  border:1px solid var(--line);padding:5px 10px;border-radius:7px;
}

/* ---------- Certifications ---------- */
.cert-card{
  display:flex;gap:16px;align-items:flex-start;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;box-shadow:var(--shadow);
}
.cert-icon{
  width:46px;height:46px;border-radius:10px;flex:none;
  background:var(--amber-light);color:var(--amber);
  display:flex;align-items:center;justify-content:center;font-weight:700;font-family:'Sora',sans-serif;
}
.cert-card h3{font-size:1rem;margin-bottom:4px;}
.cert-status{
  display:inline-block;font-size:0.74rem;font-weight:700;color:#1A7A4C;
  background:#E7F6EC;padding:3px 9px;border-radius:999px;margin-top:6px;
}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
@media (max-width:760px){.contact-grid{grid-template-columns:1fr;}}
.contact-item{
  display:flex;align-items:center;gap:14px;
  background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px;
}
.contact-item .ic{
  width:40px;height:40px;border-radius:9px;background:var(--teal-light);color:var(--teal);
  display:flex;align-items:center;justify-content:center;flex:none;
}
.contact-item h4{margin:0;font-size:0.95rem;color:var(--ink);}
.contact-item a, .contact-item span.val{font-size:0.88rem;color:var(--muted);}

form.contact-form{display:grid;gap:14px;margin-top:6px;}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;}
@media (max-width:560px){.form-row{grid-template-columns:1fr;}}
label{font-size:0.85rem;font-weight:600;color:var(--ink);display:block;margin-bottom:6px;}
input,textarea{
  width:100%;padding:11px 13px;border-radius:9px;border:1px solid var(--line);
  background:var(--bg);font-family:inherit;font-size:0.93rem;color:var(--ink);
}
input:focus,textarea:focus{outline:2px solid var(--teal);outline-offset:1px;border-color:var(--teal);}
.form-note{font-size:0.8rem;color:var(--muted);margin-top:4px;}

/* ---------- Footer ---------- */
footer.site-footer{
  border-top:1px solid var(--line);padding:32px 0;margin-top:24px;
}
.footer-row{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;}
.footer-row p{margin:0;font-size:0.85rem;}
.social-row{display:flex;gap:14px;}
.social-row a{color:var(--muted);font-weight:600;font-size:0.85rem;}

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

/* fade-in utility (used sparingly) */
.fade-up{animation:fadeUp .6s ease both;}
@keyframes fadeUp{from{opacity:0;transform:translateY(10px);}to{opacity:1;transform:translateY(0);}}