:root {
      --bg: #0a0a0f;
      --surface: #12121a;
      --surface2: #1a1a26;
      --border: #2a2a3a;
      --text: #e0e0e8;
      --text-muted: #8888a0;
      --accent: #6C63FF;
      --accent2: #00d4ff;
      --accent-glow: rgba(108, 99, 255, 0.15);
      --accent2-glow: rgba(0, 212, 255, 0.15);
      --gradient: linear-gradient(135deg, #6C63FF, #00d4ff);
      --radius: 14px;
      --section-pad: 100px 24px;
    }

    * { margin: 0; padding: 0; box-sizing: border-box; }

    html { scroll-behavior: smooth; }

    body {
      font-family: 'Inter', sans-serif;
      background: var(--bg);
      color: var(--text);
      line-height: 1.7;
      overflow-x: hidden;
    }

    ::-webkit-scrollbar { width: 6px; }
    ::-webkit-scrollbar-track { background: var(--bg); }
    ::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }

    a { color: var(--accent); text-decoration: none; transition: .2s; }
    a:hover { color: var(--accent2); }

    /* NAV */
    nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
      padding: 16px 40px;
      display: flex; justify-content: space-between; align-items: center;
      background: rgba(10,10,15,.85); backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border);
      transition: .3s;
    }
    nav .logo {
      font-size: 1.2rem; font-weight: 800;
      background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    }
    nav ul { list-style: none; display: flex; gap: 8px; }
    nav ul li a {
      color: var(--text-muted); font-size: .88rem; font-weight: 500;
      padding: 6px 14px; border-radius: 50px;
      transition: .2s;
    }
    nav ul li a:hover, nav ul li a.active {
      color: var(--text); background: var(--accent-glow);
    }
    .nav-toggle { display: none; background: none; border: none; cursor: pointer; }
    .nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); margin: 5px 0; border-radius: 2px; }

    /* SECTIONS */
    section { padding: var(--section-pad); max-width: 1100px; margin: 0 auto; }

    .section-tag {
      display: inline-flex; align-items: center; gap: 8px;
      font-family: 'JetBrains Mono', monospace;
      font-size: .78rem; font-weight: 500;
      color: var(--accent2); text-transform: uppercase; letter-spacing: 2px;
      margin-bottom: 14px;
    }
    .section-tag::before {
      content: ''; width: 28px; height: 1px;
      background: var(--accent2);
    }

    .section-title {
      font-size: clamp(2rem, 4vw, 2.8rem); font-weight: 800; line-height: 1.2;
      margin-bottom: 16px;
    }
    .section-title .hl {
      background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    }

    /* HERO */
    #hero {
      min-height: 100vh; display: flex; align-items: center;
      position: relative; overflow: hidden;
      padding-top: 80px;
    }
    #hero::before {
      content: ''; position: absolute;
      top: -30%; right: -20%; width: 700px; height: 700px;
      background: radial-gradient(circle, rgba(108,99,255,.18) 0%, transparent 70%);
      pointer-events: none;
    }
    #hero::after {
      content: ''; position: absolute;
      bottom: -20%; left: -10%; width: 500px; height: 500px;
      background: radial-gradient(circle, rgba(0,212,255,.1) 0%, transparent 70%);
      pointer-events: none;
    }

    .hero-grid {
      display: grid; grid-template-columns: 1fr 1fr; gap: 60px;
      align-items: center; position: relative; z-index: 1;
    }

    .hero-text .greeting {
      font-family: 'JetBrains Mono', monospace;
      font-size: .9rem; color: var(--accent);
      margin-bottom: 14px; letter-spacing: 1px;
    }
    .hero-text h1 {
      font-size: clamp(2.4rem, 5vw, 3.6rem); font-weight: 900; line-height: 1.1;
      margin-bottom: 10px;
    }
    .hero-text h1 .name {
      background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    }
    .hero-text .role {
      font-size: 1.1rem; color: var(--text-muted); font-weight: 400;
      margin-bottom: 24px;
    }
    .hero-text .bio {
      font-size: 1rem; color: var(--text-muted); line-height: 1.8;
      margin-bottom: 36px; max-width: 520px;
    }
    .hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }

    .btn {
      display: inline-flex; align-items: center; gap: 8px;
      padding: 13px 28px; border-radius: 50px;
      font-size: .92rem; font-weight: 600;
      transition: .25s; cursor: pointer; border: none;
    }
    .btn-primary {
      background: var(--gradient);
      color: #fff;
      box-shadow: 0 0 30px rgba(108,99,255,.35);
    }
    .btn-primary:hover {
      box-shadow: 0 0 50px rgba(108,99,255,.55);
      transform: translateY(-2px); color: #fff;
    }
    .btn-outline {
      background: transparent; color: var(--text);
      border: 1.5px solid var(--border);
    }
    .btn-outline:hover {
      border-color: var(--accent);
      background: var(--accent-glow);
      transform: translateY(-2px);
    }

    /* Stats */
    .hero-stats {
      display: flex; gap: 40px; margin-top: 48px;
    }
    .stat { text-align: left; }
    .stat .num {
      font-size: 2rem; font-weight: 800;
      background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    }
    .stat .label { font-size: .8rem; color: var(--text-muted); margin-top: 2px; }

    /* Hero Avatar */
    .hero-avatar {
      display: flex; flex-direction: column; align-items: center; gap: 20px;
    }
    .avatar-wrap {
      position: relative; width: 280px; height: 280px;
    }
    .avatar-ring {
      position: absolute; inset: 0; border-radius: 50%;
      background: var(--gradient);
      animation: spin 8s linear infinite;
    }
    .avatar-ring::before {
      content: ''; position: absolute; inset: 4px;
      background: var(--bg); border-radius: 50%;
    }
    .avatar-img {
      position: relative; z-index: 1;
      width: 100%; height: 100%; border-radius: 50%;
      background: var(--surface2);
      display: flex; align-items: center; justify-content: center;
      font-size: 4rem; font-weight: 900;
      background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
      overflow: hidden;
    }
    .avatar-img img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; }

    .hero-socials { display: flex; gap: 12px; }
    .social-btn {
      width: 42px; height: 42px; border-radius: 50%;
      border: 1.5px solid var(--border);
      display: flex; align-items: center; justify-content: center;
      color: var(--text-muted); font-size: 1.1rem;
      transition: .2s;
    }
    .social-btn:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-glow); }

    /* ABOUT */
    #about { background: var(--surface); border-radius: var(--radius); margin: 40px auto; max-width: 1100px; }
    .about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; margin-top: 40px; }
    .about-text p { color: var(--text-muted); margin-bottom: 18px; font-size: .96rem; }
    .about-text p:first-child { font-size: 1.05rem; color: var(--text); }
    .skills-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
    .skill-chip {
      padding: 6px 16px; border-radius: 50px;
      font-size: .82rem; font-weight: 500;
      background: var(--accent-glow);
      border: 1px solid rgba(108,99,255,.3);
      color: var(--accent2);
    }

    /* CERTIFICATIONS */
    .cert-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; margin-top: 40px; }
    .cert-card {
      background: var(--surface); border: 1px solid var(--border);
      border-radius: var(--radius); padding: 22px;
      transition: .25s;
    }
    .cert-card:hover { border-color: var(--accent); box-shadow: 0 0 30px var(--accent-glow); }
    .cert-icon { font-size: 2rem; margin-bottom: 12px; }
    .cert-card h3 { font-size: .96rem; font-weight: 700; margin-bottom: 6px; }
    .cert-card p { font-size: .82rem; color: var(--text-muted); }
    .cert-card .year { font-family: 'JetBrains Mono', monospace; font-size: .75rem; color: var(--accent2); margin-top: 8px; }

    /* EDUCATION */
    .edu-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; margin-top: 40px; }
    .edu-card {
      background: var(--surface); border: 1px solid var(--border);
      border-radius: var(--radius); padding: 28px;
      transition: .25s;
    }
    .edu-card:hover { border-color: var(--accent); box-shadow: 0 0 30px var(--accent-glow); }
    .edu-degree { font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; }
    .edu-school { color: var(--accent); font-size: .9rem; font-weight: 500; margin-bottom: 4px; }
    .edu-year { font-family: 'JetBrains Mono', monospace; font-size: .78rem; color: var(--accent2); }
    .edu-gpa { font-size: .85rem; color: var(--text-muted); margin-top: 8px; }

    /* PUBLICATIONS */
    .research-metrics {
      display: flex; flex-wrap: wrap; gap: 10px;
      margin-top: 28px; margin-bottom: 10px;
    }
    .rm-pill {
      display: flex; align-items: center; gap: 10px;
      border: 1px solid var(--border); border-radius: 99px;
      padding: 8px 18px; background: var(--surface);
      transition: border-color .2s, box-shadow .2s;
    }
    .rm-pill:hover { border-color: var(--accent); box-shadow: 0 0 16px var(--accent-glow); }
    .rm-num {
      font-size: 1.1rem; font-weight: 900;
      font-family: 'JetBrains Mono', monospace;
      background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    }
    .rm-div { width: 1px; height: 16px; background: var(--border); }
    .rm-lbl { font-size: .8rem; color: var(--text-muted); font-weight: 500; }
    .rm-source-line { font-size: .72rem; color: var(--text-muted); margin-bottom: 8px; }

    .research-profiles { display: flex; flex-wrap: wrap; gap: 12px; margin: 20px 0 8px; }
    .rp-btn {
      display: inline-flex; align-items: center; gap: 8px;
      padding: 9px 20px; border-radius: 50px;
      border: 1px solid var(--border); background: var(--surface);
      font-size: .85rem; font-weight: 500; color: var(--text);
      text-decoration: none; transition: .2s;
    }
    .rp-btn:hover { border-color: var(--accent); color: var(--accent); box-shadow: 0 0 20px var(--accent-glow); }
    .rp-orcid .rp-id { font-family: 'JetBrains Mono', monospace; font-size: .78rem; color: var(--accent2); }

    .pub-list { display: flex; flex-direction: column; gap: 20px; margin-top: 40px; }
    .pub-card {
      background: var(--surface); border: 1px solid var(--border);
      border-radius: var(--radius); padding: 28px;
      transition: .25s;
    }
    .pub-card:hover { border-color: var(--accent); box-shadow: 0 0 30px var(--accent-glow); }
    .pub-badge {
      display: inline-block;
      font-family: 'JetBrains Mono', monospace; font-size: .72rem; font-weight: 600;
      color: var(--accent2); background: var(--accent2-glow);
      padding: 3px 12px; border-radius: 50px; margin-bottom: 12px;
      text-transform: uppercase; letter-spacing: 1px;
    }
    .pub-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; line-height: 1.4; }
    .pub-authors { font-size: .85rem; color: var(--accent); font-weight: 500; margin-bottom: 4px; }
    .pub-venue { font-size: .82rem; color: var(--text-muted); margin-bottom: 12px; }
    .pub-year { color: var(--accent2); font-family: 'JetBrains Mono', monospace; }
    .pub-abstract { font-size: .88rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 16px; }
    .pub-links { display: flex; gap: 10px; flex-wrap: wrap; }
    .pub-link-btn {
      display: inline-flex; align-items: center; gap: 6px;
      padding: 7px 18px; border-radius: 50px;
      font-size: .8rem; font-weight: 600;
      background: var(--accent-glow); color: var(--accent);
      border: 1px solid rgba(108,99,255,.3);
      transition: .2s;
    }
    .pub-link-btn:hover { background: var(--accent); color: #fff; }

    /* CONTACT */
    #contact { }
    .contact-grid {
      display: grid; grid-template-columns: 1fr 1fr; gap: 50px; margin-top: 40px;
    }
    .contact-info h3 { font-size: 1.4rem; font-weight: 700; margin-bottom: 12px; }
    .contact-info p { color: var(--text-muted); font-size: .95rem; margin-bottom: 24px; }
    .contact-links { list-style: none; }
    .contact-links li {
      display: flex; align-items: center; gap: 14px;
      padding: 12px 0; border-bottom: 1px solid var(--border);
      font-size: .92rem;
    }
    .contact-links li .icon { font-size: 1.2rem; width: 36px; height: 36px; border-radius: 50%; background: var(--accent-glow); display: flex; align-items: center; justify-content: center; }
    .contact-links li a { color: var(--text); transition: .2s; }
    .contact-links li a:hover { color: var(--accent); }

    .contact-form { display: flex; flex-direction: column; gap: 16px; }
    .form-group { display: flex; flex-direction: column; gap: 6px; }
    .form-group label { font-size: .82rem; font-weight: 600; color: var(--text-muted); }
    .form-group input, .form-group textarea {
      background: var(--surface); border: 1.5px solid var(--border);
      border-radius: 10px; padding: 12px 16px;
      color: var(--text); font-family: 'Inter', sans-serif; font-size: .92rem;
      transition: .2s; resize: vertical;
    }
    .form-group input:focus, .form-group textarea:focus {
      outline: none; border-color: var(--accent);
      box-shadow: 0 0 0 3px var(--accent-glow);
    }
    .contact-form .btn { align-self: flex-start; }

    /* FOOTER */
    footer {
      text-align: center; padding: 40px 24px;
      border-top: 1px solid var(--border);
      color: var(--text-muted); font-size: .82rem;
    }
    footer .socials { display: flex; justify-content: center; gap: 12px; margin-bottom: 14px; }
    footer .socials a { color: var(--text-muted); font-size: 1.1rem; transition: .2s; }
    footer .socials a:hover { color: var(--accent); }

    /* SECTION DIVIDER */
    .section-divider {
      height: 1px; background: linear-gradient(to right, transparent, var(--border), transparent);
      max-width: 1100px; margin: 0 auto;
    }

    /* SCROLL ANIMATIONS */
    .reveal { opacity: 0; transform: translateY(30px); transition: .7s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }

    /* EXPERIENCE CARDS */
    .exp-cards { display: flex; flex-direction: column; gap: 20px; margin-top: 40px; }
    .exp-card {
      background: var(--surface); border: 1px solid var(--border);
      border-radius: var(--radius); padding: 28px;
      transition: .25s;
    }
    .exp-card:hover { border-color: var(--accent); box-shadow: 0 0 30px var(--accent-glow); }
    .exp-card .exp-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 14px; flex-wrap: wrap; gap: 8px; }
    .exp-card .exp-title { font-size: 1.1rem; font-weight: 700; }
    .exp-card .exp-company { color: var(--accent); font-size: .9rem; font-weight: 500; margin-top: 2px; }
    .exp-card .exp-date {
      font-family: 'JetBrains Mono', monospace; font-size: .75rem;
      color: var(--accent2); background: var(--accent2-glow);
      padding: 4px 12px; border-radius: 50px; white-space: nowrap;
    }
    .exp-card .exp-points { list-style: none; }
    .exp-card .exp-points li {
      font-size: .88rem; color: var(--text-muted);
      padding: 4px 0 4px 18px; position: relative; line-height: 1.6;
    }
    .exp-card .exp-points li::before { content: '▹'; position: absolute; left: 0; color: var(--accent); }

    @keyframes spin { to { transform: rotate(360deg); } }

    /* RESPONSIVE */
    @media (max-width: 768px) {
      nav { padding: 14px 20px; }
      nav ul { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--surface); flex-direction: column; padding: 20px; border-bottom: 1px solid var(--border); }
      nav ul.open { display: flex; }
      .nav-toggle { display: block; }

      .hero-grid { grid-template-columns: 1fr; text-align: center; gap: 40px; }
      .hero-stats { justify-content: center; }
      .hero-btns { justify-content: center; }
      .hero-avatar { order: -1; }
      .avatar-wrap { width: 200px; height: 200px; }
      .hero-text .bio { margin: 0 auto 36px; }

      .about-grid { grid-template-columns: 1fr; gap: 30px; }
      .contact-grid { grid-template-columns: 1fr; }

      /* Skills bars stack on mobile */
      .skills-bars-grid { grid-template-columns: 1fr !important; }

      /* Dashboard charts stack on mobile */
      .dashboard-grid { grid-template-columns: 1fr !important; }

      section { padding: 70px 20px; }
    }

    /* ─── SKILL BARS SECTION ─── */
    .skills-section {
      padding: var(--section-pad);
      max-width: 1100px;
      margin: 0 auto;
    }

    .skills-bars-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px 60px;
      margin-top: 40px;
    }

    .skill-bar-item {
      position: relative;
    }

    .skill-bar-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 10px;
    }

    .skill-bar-name {
      font-size: .9rem;
      font-weight: 600;
      color: var(--text);
    }

    .skill-bar-pct {
      font-family: 'JetBrains Mono', monospace;
      font-size: .78rem;
      font-weight: 500;
      color: var(--accent2);
    }

    .skill-bar-track {
      width: 100%;
      height: 8px;
      background: var(--surface2);
      border-radius: 50px;
      overflow: hidden;
      position: relative;
    }

    .skill-bar-fill {
      height: 100%;
      border-radius: 50px;
      background: var(--gradient);
      width: 0;
      transition: width 1.4s cubic-bezier(.22,.61,.36,1);
      position: relative;
    }

    /* Glow shimmer on the bar */
    .skill-bar-fill::after {
      content: '';
      position: absolute;
      right: 0; top: 0; bottom: 0;
      width: 40px;
      background: linear-gradient(to right, transparent, rgba(255,255,255,.35));
      border-radius: 0 50px 50px 0;
    }

    .skill-bar-fill.animated {
      width: var(--target-width);
    }

    /* Sub-label below each bar (category / sub-skill hint) */
    .skill-bar-sub {
      font-size: .72rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* Category group header */
    .skill-group-title {
      font-size: .75rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 2px;
      color: var(--accent2);
      font-family: 'JetBrains Mono', monospace;
      margin: 28px 0 14px;
      padding-bottom: 6px;
      border-bottom: 1px solid var(--border);
    }
    .skill-group-title:first-child { margin-top: 0; }

    /* Experience level dots */
    .exp-level {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      font-size: .75rem;
      color: var(--text-muted);
      margin-top: 6px;
    }
    .exp-level .dot {
      width: 6px; height: 6px; border-radius: 50%;
      background: var(--accent2);
      display: inline-block;
    }

    /* ─── DASHBOARD / CHARTS ─── */
    .dashboard-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 32px;
    }

    .dashboard-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 20px;
      transition: border-color .25s, box-shadow .25s;
    }
    .dashboard-card:hover {
      border-color: var(--accent);
      box-shadow: 0 0 30px var(--accent-glow);
    }

    .dash-title {
      font-size: .85rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 14px;
      padding-bottom: 10px;
      border-bottom: 1px solid var(--border);
    }

    .chart-container {
      position: relative;
      width: 100%;
      /* Keep charts compact but visible */
      max-height: 260px;
    }