/*
  Vivek Kumar Gupta • Portfolio Styles
  - Responsive layout
  - Modern gradients + glassmorphism
  - Accessible contrast & focus
*/

:root{
  --bg:#0b0f14;           /* darker base */
  --bg-soft:#0f141b;       /* panels */
  --surface:#121923;       /* solid surface */
  --surface-2:#182233;     /* hover surface */
  --text:#e6edf3;
  --muted:#9fb0c3;
  --primary:#60a5fa;       /* blue */
  --primary-2:#22d3ee;     /* cyan */
  --accent:#a855f7;        /* purple accent */
  --danger:#ef4444;
  --card-shadow:0 10px 30px rgba(0,0,0,.35);
  --radius:14px;
  --radius-sm:10px;
  --container:1100px;
}

/* Light theme variables */
:root.light{
  --bg:#f7f9fc;
  --bg-soft:#ffffff;
  --surface:#ffffff;
  --surface-2:#f0f4fa;
  --text:#0d1117;
  --muted:#5b6b7f;
  --primary:#2563eb;
  --primary-2:#0ea5e9;
  --accent:#7c3aed;
  --card-shadow:0 10px 30px rgba(17,24,39,.12);
}

*{box-sizing:border-box}
html,body{height:100%}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  color:var(--text);
  background-color:var(--bg);
  /* Subtle, professional backdrop (no grid) */
  background-image:
    radial-gradient(800px 500px at 15% -10%, rgba(34,211,238,0.06), transparent 60%),
    radial-gradient(900px 600px at 110% 0%, rgba(168,85,247,0.06), transparent 62%);
  background-size:auto;
  line-height:1.6;
}

/**********************
  Containers & Layout
**********************/
.container{max-width:var(--container); margin:0 auto; padding:0 20px}
.section{padding:28px 0}
@media(max-width:860px){
  .section{padding:24px 0}
}
.section-title{font-size:28px; margin:0 0 12px 0; font-weight:800; letter-spacing:.3px}
.subsection-title{font-size:20px; margin:0 0 10px 0; font-weight:700; color:var(--text)}
.grid{display:grid; gap:16px}
.grid.cards{grid-template-columns:1fr}
.grid.cards > .card{grid-column:auto}
@media(min-width:900px){
  .grid.cards{grid-template-columns:repeat(3,1fr)}
}
/* Ensure Technical Skills displays as 2 columns (3 rows) on desktop */
@media(min-width:900px){
  .grid.skills{grid-template-columns:repeat(2,1fr)}
}

/**********************
  Header & Nav
**********************/
.site-header{position:sticky; top:0; z-index:50; backdrop-filter:saturate(140%) blur(8px); background:rgba(11,15,20,0.75); border-bottom:1px solid rgba(255,255,255,0.06)}
.header-inner{display:flex; align-items:center; justify-content:space-between; min-height:64px}
.brand{display:flex; align-items:center; color:var(--text); text-decoration:none; gap:10px}
.logo{display:inline-grid; place-items:center; width:36px; height:36px; border-radius:10px; background:linear-gradient(135deg,var(--primary), var(--primary-2)); font-weight:800}
.brand-text{font-weight:800; letter-spacing:.3px}
.nav-toggle{display:inline-flex; align-items:center; justify-content:center; width:40px; height:40px; border:none; border-radius:10px; background:var(--surface); color:var(--text); cursor:pointer}
.theme-toggle{display:inline-grid; place-items:center; width:40px; height:40px; border:none; margin-right:8px; border-radius:10px; background:var(--surface); color:var(--text); cursor:pointer}
.theme-toggle:hover{background:var(--surface-2)}
.nav-menu{display:none; list-style:none; padding:0; margin:0}
.nav-menu a{display:block; padding:10px 14px; border-radius:10px; color:var(--text); text-decoration:none}
.nav-menu a:hover{background:var(--surface)}
@media(min-width:860px){
  .nav-toggle{display:none}
  .nav-menu{display:flex; gap:6px}
}

/* Mobile menu active */
.nav-menu.open{display:block; position:absolute; right:20px; top:64px; background:var(--bg-soft); border:1px solid rgba(255,255,255,0.06); border-radius:12px; box-shadow:var(--card-shadow)}

/**********************
  Hero
**********************/
.hero{display:grid; gap:24px; grid-template-columns:1fr; padding:56px 0 32px}
.hero .eyebrow{color:var(--primary-2); font-weight:700; margin:0 0 6px 0}
.hero h1{font-size:36px; line-height:1.15; margin:0 0 6px 0}
.hero .highlight{background:linear-gradient(135deg,var(--primary),var(--primary-2)); -webkit-background-clip:text; background-clip:text; color:transparent}
.hero .highlight.shine{background-size:200% 200%; animation:shineMove 3.5s ease-in-out infinite}
@keyframes shineMove{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}
.hero .kicker{color:#b8c8dc; margin:0 0 8px 0; font-weight:600}
.hero .caret{display:inline-block; width:10px; margin-left:4px; background:currentColor; height:1.1em; vertical-align:text-bottom; animation:blink 1s step-end infinite}
@keyframes blink{50%{opacity:0}}
.hero .subtitle{color:var(--muted); margin:0 0 8px 0; max-width:70ch}
.hero .meta{list-style:none; padding:0; margin:0 0 8px 0; color:var(--muted)}
.hero .meta li{margin:4px 0}
.hero .link{color:var(--text); text-decoration:none}
.hero .link:hover{color:#fff}


.hero .cta{display:flex; flex-wrap:wrap; gap:10px; margin:14px 0}
.btn{display:inline-flex; align-items:center; gap:8px; padding:10px 14px; border-radius:12px; border:1px solid rgba(255,255,255,0.12); text-decoration:none; color:var(--text); background:var(--surface); transition:all .2s}
.btn:hover{transform:translateY(-2px); background:var(--surface-2); box-shadow:0 8px 20px rgba(34,211,238,.15)}
.btn:active{transform:translateY(0)}
.btn.primary{background:linear-gradient(135deg,var(--primary),var(--primary-2)); border:none}
.btn.ghost{background:transparent}
.btn.small{padding:8px 10px; font-size:14px}
.badges{display:flex; flex-wrap:wrap; gap:6px; color:var(--muted)}
.badge{background:rgba(124,58,237,0.15); border:1px solid rgba(124,58,237,0.35); color:#d6c6ff; padding:4px 8px; border-radius:999px; font-size:12px}

.hero-art{display:grid; place-items:center}
.avatar{width:220px; height:220px; border-radius:28px; display:grid; place-items:center; font-weight:800; font-size:48px; letter-spacing:.5px;
  background:linear-gradient(135deg, rgba(96,165,250,0.22), rgba(34,211,238,0.22)); border:1px solid rgba(255,255,255,0.12); box-shadow:var(--card-shadow);
  position:relative; overflow:hidden; animation:float 6s ease-in-out infinite}
.avatar::after{content:""; position:absolute; inset:-40%; background:radial-gradient(120px 120px at 30% 30%, rgba(34,211,238,.25), transparent 60%);
  transform:rotate(25deg); filter:blur(20px)}
.avatar img{width:100%; height:100%; object-fit:cover; border-radius:inherit; display:block}
.avatar img{filter:saturate(1.05) contrast(1.05)}
.avatar:hover{box-shadow:0 20px 40px rgba(96,165,250,.15)}
@keyframes float{0%{transform:translateY(0)}50%{transform:translateY(-6px)}100%{transform:translateY(0)}}
.tech-chiplist{display:flex; gap:8px; margin-top:14px; flex-wrap:wrap; justify-content:center}
.chip{font-size:12px; padding:6px 10px; border-radius:999px; background:rgba(255,255,255,0.06); border:1px solid rgba(255,255,255,0.12);
  position:relative; overflow:hidden; transition:transform .2s, background .2s}
.chip:hover{transform:translateY(-2px); background:rgba(255,255,255,0.1)}
.chip::after{content:""; position:absolute; left:-20%; top:0; width:40%; height:100%; background:linear-gradient(90deg, transparent, rgba(255,255,255,.25), transparent);
  transform:skewX(-20deg); opacity:0}
.chip:hover::after{animation:shine .8s ease}
@keyframes shine{0%{left:-20%; opacity:0}30%{opacity:1}100%{left:120%; opacity:0}}

@media(min-width:900px){
  .hero{grid-template-columns:1.2fr .8fr; align-items:center}
  .hero h1{font-size:46px}
  .avatar{width:260px; height:260px}
}

/**********************
  Cards, Timeline, Content
**********************/
.card{background:var(--surface); border:1px solid rgba(255,255,255,0.1); border-radius:var(--radius); padding:16px; box-shadow:var(--card-shadow)}
.card{transition:transform .25s ease, box-shadow .25s ease}
.card:hover{transform:translateY(-3px); box-shadow:0 14px 34px rgba(0,0,0,.35)}
.light .card{border:1px solid rgba(17,24,39,0.08)}
.item-head{display:flex; align-items:center; justify-content:space-between; gap:10px}
.item-points{margin:8px 0 0 18px}
.item-points li{margin:4px 0}
.item-points.small li{margin:3px 0}
.project .project-head{display:flex; align-items:center; justify-content:space-between; gap:10px}
.project .date{color:var(--muted)}
.project .actions{display:flex; gap:8px; margin:6px 0 8px 0; flex-wrap:wrap}
.project-thumb{width:100%; aspect-ratio: 16/9; border-radius: var(--radius-sm); overflow:hidden; background: var(--surface-2); border:1px solid rgba(255,255,255,0.1); margin-bottom:10px; position:relative; text-decoration:none; color:inherit; display:block}
.light .project-thumb{border:1px solid rgba(17,24,39,0.08)}
.project-thumb img{width:100%; height:100%; object-fit:cover; display:block; filter:saturate(1.05) contrast(1.03)}
.project-thumb:hover{transform:translateY(-2px); box-shadow:0 10px 24px rgba(0,0,0,.28)}
.project-thumb::after{content:"Open"; position:absolute; right:10px; bottom:10px; padding:6px 10px; font-size:12px; border-radius:999px; background:rgba(0,0,0,.42); color:#fff; opacity:0; transform:translateY(6px); transition:opacity .2s ease, transform .2s ease}
.project-thumb:hover::after, .project-thumb:focus-visible::after{opacity:1; transform:translateY(0)}
.project-thumb:focus-visible{outline:2px dashed var(--primary-2); outline-offset:6px}
.project .project-desc.small{margin:4px 0 0 0; color:var(--muted)}

/* Center the Projects CTA below the row */
.projects-cta{display:flex; justify-content:center}

/* Project tabs */
.projects-tabs{display:flex; gap:8px; margin:8px 0 12px 0; flex-wrap:wrap}
.projects-tabs .tab{border:1px solid rgba(255,255,255,0.12); background:var(--surface); color:var(--text); padding:8px 12px; border-radius:10px; cursor:pointer}
.projects-tabs .tab.active{background:linear-gradient(135deg,var(--primary),var(--primary-2)); border:none; color:#fff}
.one-row{grid-template-columns:1fr}
@media(min-width:680px){
  .one-row{grid-template-columns:repeat(2,1fr)}
}
@media(min-width:900px){
  .one-row{grid-template-columns:repeat(3,1fr)}
}

.timeline{display:grid; gap:16px}

/* Dual column layout for Experience & Education */
.two-col{display:grid; gap:16px}
@media(min-width:900px){
  .two-col{grid-template-columns:1fr 1fr}
}
/* Ensure equal height cards in Experience & Education */
.two-col > .card{display:flex; flex-direction:column; height:100%}
.two-col > .card .timeline{flex:1}
.two-col > .card div{display:block}

/* Skills section */
.skills-grid{display:grid; gap:16px}
.skills-col{display:grid; gap:12px}
@media(min-width:900px){
  .skills-grid{grid-template-columns:1fr 1fr}
}
.skill-head{display:flex; align-items:center; justify-content:space-between}
.skill-head h3{margin:0}
.skill-percent{color:var(--muted); font-weight:700}
.skill-bar{position:relative; height:12px; border-radius:999px; background:linear-gradient(0deg, rgba(255,255,255,0.08), rgba(255,255,255,0.08)); overflow:hidden; border:1px solid rgba(255,255,255,0.12)}
.light .skill-bar{border:1px solid rgba(17,24,39,0.08); background:rgba(17,24,39,0.06)}
.skill-fill{position:absolute; left:0; top:0; bottom:0; border-radius:inherit}
.skill-fill.purple{background:#6d28d9}
.skill-fill.yellow{background:#f59e0b}
.skill-fill.red{background:#ef4444}
.skill-fill.dark{background:#111827}
.skill-fill.cyan{background:#06b6d4}

/**********************
  Certificates
**********************/
.certificates-grid{display:grid; gap:16px}
@media(min-width:900px){
  .certificates-grid{grid-template-columns:repeat(3,1fr)}
}
.certificate-thumb{width:100%; aspect-ratio: 16/9; border-radius: var(--radius-sm); overflow:hidden; background: var(--surface-2); border:1px solid rgba(255,255,255,0.1); margin-bottom:10px}
.light .certificate-thumb{border:1px solid rgba(17,24,39,0.08)}
.certificate-thumb img{width:100%; height:100%; object-fit:cover; display:block}
.certificate-thumb{display:block; cursor:pointer}
.certificate-thumb:hover{transform:translateY(-2px); box-shadow:0 8px 20px rgba(34,211,238,.12)}
.certificate-head{display:flex; align-items:center; justify-content:space-between; gap:10px}
.certificate-card .actions{display:none}

/**********************
  Contact & Footer
**********************/
.contact-card{display:flex; flex-direction:column; gap:12px}
.site-footer{margin-top:40px; border-top:1px solid rgba(255,255,255,0.08); background:rgba(255,255,255,0.02)}
.footer-inner{display:flex; align-items:center; justify-content:space-between; gap:10px; padding:18px 0}
.footer-inner p{margin:0; color:var(--muted)}
.footer-inner .social{display:flex; gap:8px; list-style:none; margin:0; padding:0}
.footer-inner .social a{display:inline-grid; place-items:center; width:36px; height:36px; border-radius:10px; background:var(--surface); color:var(--text); border:1px solid rgba(255,255,255,0.1)}
.footer-inner .social a:hover{background:var(--surface-2); transform:translateY(-2px)}

/* Contact layout new */
.contact-header{display:flex; align-items:center; justify-content:space-between; gap:10px; margin-bottom:12px}
.say-hello{padding:10px 16px}
.contact-grid{display:grid; gap:16px}
@media(min-width:900px){
  .contact-grid{grid-template-columns:1fr 1.2fr}
}
.contact-info .info-block{margin-bottom:12px}
.contact-info .label{margin:0 0 4px 0; color:var(--muted)}
.contact-info .value{margin:0; font-weight:800}
.contact-info .value a{color:var(--text); text-decoration:none}
.contact-info .value a:hover{text-decoration:underline}
.social.big{display:flex; gap:8px; list-style:none; padding:0; margin:6px 0 0 0}
.social.big a{display:inline-grid; place-items:center; width:36px; height:36px; border-radius:10px; background:linear-gradient(135deg,var(--primary),var(--primary-2)); color:#fff; overflow:hidden}
.social.big img{width:22px; height:22px; display:block; filter:drop-shadow(0 0 0 rgba(0,0,0,0))}
.social.big a:hover{transform:translateY(-2px)}

.contact-form input,
.contact-form textarea{width:100%; padding:12px 14px; border-radius:12px; border:1px solid rgba(255,255,255,0.12); background:var(--surface); color:var(--text)}
.light .contact-form input,
.light .contact-form textarea{border:1px solid rgba(17,24,39,0.08)}
.contact-form .form-row{display:grid; gap:10px; margin-bottom:10px}
@media(min-width:900px){
  .contact-form .form-row:first-child{grid-template-columns:1fr 1fr}
}
.contact-form .form-actions{display:flex; justify-content:flex-start}
.form-status{margin-top:8px; font-size:14px; color:var(--muted)}
.form-status[data-type="success"]{color:#22c55e}
.form-status[data-type="warning"]{color:#f59e0b}

.back-to-top{position:fixed; right:20px; bottom:20px; width:40px; height:40px; border-radius:12px; border:none; background:linear-gradient(135deg,var(--primary),var(--primary-2)); color:#fff; display:none; align-items:center; justify-content:center; cursor:pointer; box-shadow:var(--card-shadow)}
.back-to-top.show{display:flex; animation:fadeIn .3s ease}
@keyframes fadeIn{from{opacity:0; transform:translateY(6px)} to{opacity:1; transform:translateY(0)}}

/**********************
  Entrance Animations
**********************/
.hero .hero-text{animation:slideUp .6s ease both}
.hero .hero-art{animation:slideUp .8s ease .1s both}
@keyframes slideUp{from{opacity:0; transform:translateY(10px)} to{opacity:1; transform:translateY(0)}}

/* Button ripple animation keyframes used by JS */
@keyframes btnRipple{from{opacity:.0}30%{opacity:.8}100%{opacity:0}}

/**********************
  Gradient Underlines & Focus
**********************/
.section-title{position:relative}
.section-title::after{content:""; position:absolute; left:0; bottom:-6px; width:64px; height:3px; background:linear-gradient(90deg,var(--primary),var(--accent))}

/**********************
  Background Art
**********************/
/* Background blobs removed for simpler dark design */

/**********************
  A11y & Utilities
**********************/
:focus{outline:none}
:focus-visible{outline:2px dashed var(--primary-2); outline-offset:3px}
.highlight{font-weight:800}
.meta-right{color:var(--muted); font-size:14px}

/**********************
  Typography tweaks
**********************/
.section .card p{margin:0}
.card h3{margin:0 0 8px 0}

/**********************
  Small screens
**********************/
@media(max-width:859px){
  .nav-menu.open a{padding:12px 16px}
  .footer-inner{flex-direction:column}
}