:root {
    --bg: #0d0f14;
    --bg2: #12151c;
    --bg3: #181c26;
    --card: #1a1e2a;
    --border: #252a38;
    --accent: #e87c2e;
    --accent2: #4f8ef7;
    --text: #d4d8e8;
    --muted: #6b7394;
    --white: #f0f2fa;
  }

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

  html { scroll-behavior: smooth; }

  body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    font-size: 15px;
    line-height: 1.6;
    overflow-x: hidden;
  }

  /* ── NAV ── */
  nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    display: flex; align-items: center; justify-content: space-between;
    padding: 18px 48px;
    background: rgba(13,15,20,0.85);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
  }
  .nav-logo {
    font-family: 'Syne', sans-serif; font-weight: 800; font-size: 18px;
    color: var(--white); letter-spacing: 0.04em;
  }
  .nav-logo span { color: var(--accent); }
  .nav-links { display: flex; gap: 32px; list-style: none; }
  .nav-links a {
    color: var(--muted); text-decoration: none; font-size: 13px;
    letter-spacing: 0.08em; text-transform: uppercase;
    transition: color 0.2s;
  }
  .nav-links a:hover { color: var(--accent); }
  .nav-cta {
    background: var(--accent); color: #fff; border: none;
    padding: 10px 22px; border-radius: 4px; font-size: 13px;
    font-family: 'Syne', sans-serif; font-weight: 700;
    cursor: pointer; letter-spacing: 0.06em; transition: opacity 0.2s;
    text-decoration: none;
  }
  .nav-cta:hover { opacity: 0.85; }

  /* ── HERO ── */
  #hero {
    min-height: 100vh;
    display: grid; grid-template-columns: 1fr 1fr;
    align-items: center; gap: 48px;
    padding: 120px 48px 80px;
    position: relative; overflow: hidden;
  }
  .hero-grid-bg {
    position: absolute; inset: 0; z-index: 0;
    background-image:
      linear-gradient(rgba(78,142,247,0.04) 1px, transparent 1px),
      linear-gradient(90deg, rgba(78,142,247,0.04) 1px, transparent 1px);
    background-size: 48px 48px;
  }
  .hero-glow {
    position: absolute; top: -120px; right: -120px;
    width: 500px; height: 500px; border-radius: 50%;
    background: radial-gradient(circle, rgba(232,124,46,0.12) 0%, transparent 70%);
    z-index: 0;
  }
  .hero-left { position: relative; z-index: 1; }
  .hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: rgba(79,142,247,0.1); border: 1px solid rgba(79,142,247,0.25);
    border-radius: 100px; padding: 6px 14px; font-size: 12px;
    color: var(--accent2); letter-spacing: 0.08em; text-transform: uppercase;
    margin-bottom: 24px;
  }
  .hero-badge::before {
    content: ''; width: 7px; height: 7px; border-radius: 50%;
    background: var(--accent2); animation: pulse 2s infinite;
  }
  @keyframes pulse {
    0%,100% { opacity: 1; } 50% { opacity: 0.4; }
  }
  .hero-name {
    font-family: 'Syne', sans-serif; font-weight: 800;
    font-size: clamp(40px, 5vw, 64px); line-height: 1.05;
    color: var(--white); margin-bottom: 8px;
  }
  .hero-title {
    font-family: 'Syne', sans-serif; font-weight: 700;
    font-size: clamp(20px, 3vw, 34px); line-height: 1.2;
    color: var(--accent); margin-bottom: 24px;
  }
  .hero-desc {
    color: var(--muted); font-size: 15px; max-width: 460px;
    line-height: 1.75; margin-bottom: 36px;
  }
  .hero-stats {
    display: flex; gap: 40px; margin-bottom: 40px;
  }
  .stat-num {
    font-family: 'Syne', sans-serif; font-weight: 800; font-size: 32px;
    color: var(--white);
  }
  .stat-num span { color: var(--accent); }
  .stat-label { font-size: 12px; color: var(--muted); letter-spacing: 0.05em; margin-top: 2px; }
  .hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
  .btn-primary {
    background: var(--accent); color: #fff; padding: 13px 28px;
    border-radius: 4px; font-family: 'Syne', sans-serif; font-weight: 700;
    font-size: 14px; text-decoration: none; letter-spacing: 0.05em;
    transition: opacity 0.2s; display: inline-flex; align-items: center; gap: 8px;
  }
  .btn-primary:hover { opacity: 0.85; }
  .btn-secondary {
    background: transparent; color: var(--text); padding: 13px 28px;
    border-radius: 4px; border: 1px solid var(--border);
    font-family: 'Syne', sans-serif; font-weight: 600;
    font-size: 14px; text-decoration: none; letter-spacing: 0.05em;
    transition: border-color 0.2s, color 0.2s;
    display: inline-flex; align-items: center; gap: 8px;
  }
  .btn-secondary:hover { border-color: var(--accent2); color: var(--accent2); }

  /* Hero Right — Avatar */
  .hero-right {
    position: relative; z-index: 1;
    display: flex; align-items: center; justify-content: center;
  }
  .avatar-ring {
    width: 300px; height: 300px; border-radius: 50%;
    border: 2px solid var(--border);
    display: flex; align-items: center; justify-content: center;
    position: relative;
  }
  .avatar-ring::before {
    content: ''; position: absolute; inset: -14px; border-radius: 50%;
    border: 1px solid rgba(232,124,46,0.3);
    animation: spin 12s linear infinite;
  }
  .avatar-ring::after {
    content: ''; position: absolute; inset: -30px; border-radius: 50%;
    border: 1px dashed rgba(79,142,247,0.2);
    animation: spin 20s linear infinite reverse;
  }
  @keyframes spin { to { transform: rotate(360deg); } }
  .avatar-inner {
    width: 260px; height: 260px; border-radius: 50%;
    background: var(--card);
    border: 2px solid var(--border);
    display: flex; align-items: center; justify-content: center;
    flex-direction: column; gap: 6px; overflow: hidden;
  }
  .avatar-placeholder {
    width: 100%; height: 100%; border-radius: 50%;
    background: linear-gradient(135deg, var(--bg3) 0%, var(--card) 100%);
    display: flex; align-items: center; justify-content: center;
    flex-direction: column;
  }
  .avatar-initials {
    font-family: 'Syne', sans-serif; font-weight: 800; font-size: 56px;
    color: var(--accent); letter-spacing: -2px;
  }
  .avatar-label {
    font-size: 11px; color: var(--muted); letter-spacing: 0.1em; text-transform: uppercase;
  }

  /* ── SECTION COMMON ── */
  section { padding: 90px 48px; }
  .section-tag {
    font-family: 'Space Mono', monospace; font-size: 11px;
    color: var(--accent); letter-spacing: 0.15em; text-transform: uppercase;
    margin-bottom: 12px; display: flex; align-items: center; gap: 10px;
  }
  .section-tag::before {
    content: '//'; color: var(--accent2); font-size: 13px;
  }
  .section-title {
    font-family: 'Syne', sans-serif; font-weight: 800;
    font-size: clamp(28px, 4vw, 44px); color: var(--white); margin-bottom: 12px;
  }
  .section-title span { color: var(--accent); }
  .section-sub {
    color: var(--muted); font-size: 15px; max-width: 520px; line-height: 1.7;
  }
  .section-header { margin-bottom: 56px; }
  .divider {
    height: 1px; background: var(--border); margin: 0 48px;
  }

  /* ── SERVICES ── */
  #services { background: var(--bg2); }
  .services-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
  }
  .service-card {
    background: var(--card); border: 1px solid var(--border);
    border-radius: 8px; padding: 28px 24px;
    transition: border-color 0.25s, transform 0.25s;
    position: relative; overflow: hidden;
  }
  .service-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    opacity: 0; transition: opacity 0.25s;
  }
  .service-card:hover { border-color: rgba(232,124,46,0.4); transform: translateY(-4px); }
  .service-card:hover::before { opacity: 1; }
  .service-icon {
    width: 44px; height: 44px; border-radius: 8px;
    background: rgba(232,124,46,0.1); border: 1px solid rgba(232,124,46,0.2);
    display: flex; align-items: center; justify-content: center;
    font-size: 20px; margin-bottom: 16px;
  }
  .service-name {
    font-family: 'Syne', sans-serif; font-weight: 700; font-size: 16px;
    color: var(--white); margin-bottom: 10px;
  }
  .service-desc { font-size: 13px; color: var(--muted); line-height: 1.65; margin-bottom: 16px; }
  .service-tags { display: flex; flex-wrap: wrap; gap: 6px; }
  .tag {
    background: rgba(79,142,247,0.08); border: 1px solid rgba(79,142,247,0.18);
    color: var(--accent2); font-size: 11px; padding: 3px 10px; border-radius: 100px;
    font-family: 'Space Mono', monospace;
  }

  /* ── SKILLS ── */
  #skills { background: var(--bg); }
  .skills-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
  .skill-bar-item { margin-bottom: 20px; }
  .skill-bar-top { display: flex; justify-content: space-between; margin-bottom: 8px; }
  .skill-bar-name { font-size: 14px; color: var(--text); }
  .skill-bar-pct { font-family: 'Space Mono', monospace; font-size: 13px; color: var(--accent); }
  .skill-bar-track {
    height: 5px; background: var(--border); border-radius: 10px; overflow: hidden;
  }
  .skill-bar-fill {
    height: 100%; border-radius: 10px;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    width: 0; transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
  }
  .skills-icons { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
  .skill-badge {
    background: var(--card); border: 1px solid var(--border); border-radius: 8px;
    padding: 18px 14px; text-align: center; transition: border-color 0.2s;
  }
  .skill-badge:hover { border-color: var(--accent); }
  .skill-badge-icon { font-size: 24px; margin-bottom: 8px; }
  .skill-badge-name { font-size: 12px; color: var(--muted); }

  /* ── EXPERIENCE ── */
  #experience { background: var(--bg2); }
  .exp-timeline { position: relative; padding-left: 28px; }
  .exp-timeline::before {
    content: ''; position: absolute; left: 0; top: 8px; bottom: 8px;
    width: 1px; background: var(--border);
  }
  .exp-item {
    position: relative; margin-bottom: 40px; padding-left: 28px;
  }
  .exp-item::before {
    content: ''; position: absolute; left: -34px; top: 6px;
    width: 12px; height: 12px; border-radius: 50%;
    background: var(--accent); border: 2px solid var(--bg2);
    box-shadow: 0 0 0 3px rgba(232,124,46,0.2);
  }
  .exp-header { display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 8px; margin-bottom: 6px; }
  .exp-role { font-family: 'Syne', sans-serif; font-weight: 700; font-size: 17px; color: var(--white); }
  .exp-period {
    background: rgba(232,124,46,0.1); border: 1px solid rgba(232,124,46,0.2);
    color: var(--accent); font-size: 11px; padding: 4px 12px; border-radius: 100px;
    font-family: 'Space Mono', monospace; white-space: nowrap;
  }
  .exp-company { font-size: 14px; color: var(--accent2); margin-bottom: 10px; }
  .exp-desc { font-size: 14px; color: var(--muted); line-height: 1.7; }
  .exp-bullets { list-style: none; margin-top: 8px; }
  .exp-bullets li { font-size: 14px; color: var(--muted); line-height: 1.7; padding-left: 16px; position: relative; }
  .exp-bullets li::before { content: '▸'; position: absolute; left: 0; color: var(--accent); font-size: 11px; }

  /* ── EDUCATION ── */
  #education { background: var(--bg); }
  .edu-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
  .edu-card {
    background: var(--card); border: 1px solid var(--border); border-radius: 8px;
    padding: 28px 24px; transition: border-color 0.2s;
  }
  .edu-card:hover { border-color: rgba(79,142,247,0.4); }
  .edu-degree { font-family: 'Syne', sans-serif; font-weight: 700; font-size: 17px; color: var(--white); margin-bottom: 6px; }
  .edu-uni { font-size: 14px; color: var(--accent2); }
  .edu-icon { font-size: 28px; margin-bottom: 14px; }

  /* ── RESEARCH ── */
  #research { background: var(--bg2); }
  .research-list { display: grid; gap: 16px; }
  .research-item {
    background: var(--card); border: 1px solid var(--border); border-radius: 8px;
    padding: 22px 24px; display: grid; grid-template-columns: auto 1fr; gap: 20px;
    align-items: center; transition: border-color 0.2s;
  }
  .research-item:hover { border-color: rgba(232,124,46,0.3); }
  .research-num {
    font-family: 'Space Mono', monospace; font-size: 28px; font-weight: 700;
    color: rgba(232,124,46,0.2); min-width: 40px;
  }
  .research-title { font-family: 'Syne', sans-serif; font-weight: 600; font-size: 15px; color: var(--white); margin-bottom: 4px; }
  .research-journal { font-size: 12px; color: var(--accent2); }

  /* ── PROJECTS ── */
  #projects { background: var(--bg); }
  .projects-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
  .project-card {
    background: var(--card); border: 1px solid var(--border); border-radius: 8px;
    padding: 28px 24px; transition: border-color 0.25s, transform 0.25s; position: relative; overflow: hidden;
  }
  .project-card::after {
    content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    transform: scaleX(0); transform-origin: left; transition: transform 0.3s;
  }
  .project-card:hover { border-color: rgba(232,124,46,0.3); transform: translateY(-4px); }
  .project-card:hover::after { transform: scaleX(1); }
  .project-label { font-size: 11px; color: var(--accent); letter-spacing: 0.1em; text-transform: uppercase; font-family: 'Space Mono', monospace; margin-bottom: 10px; }
  .project-name { font-family: 'Syne', sans-serif; font-weight: 700; font-size: 18px; color: var(--white); margin-bottom: 10px; }
  .project-desc { font-size: 14px; color: var(--muted); line-height: 1.65; }
  .project-stack { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
  .stack-tag {
    background: rgba(232,124,46,0.08); border: 1px solid rgba(232,124,46,0.18);
    color: var(--accent); font-size: 11px; padding: 3px 10px; border-radius: 100px;
    font-family: 'Space Mono', monospace;
  }

  /* ── CONTACT ── */
  #contact { background: var(--bg2); }
  .contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
  .contact-info { display: grid; gap: 16px; }
  .contact-item {
    display: flex; align-items: center; gap: 14px;
    background: var(--card); border: 1px solid var(--border);
    border-radius: 8px; padding: 16px 20px; transition: border-color 0.2s;
  }
  .contact-item:hover { border-color: var(--accent2); }
  .contact-icon { font-size: 18px; min-width: 24px; text-align: center; }
  .contact-label { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 2px; }
  .contact-val { font-size: 14px; color: var(--text); }
  .contact-form { display: grid; gap: 16px; }
  .form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
  .form-group { display: flex; flex-direction: column; gap: 6px; }
  .form-group label { font-size: 12px; color: var(--muted); letter-spacing: 0.06em; text-transform: uppercase; }
  .form-group input, .form-group textarea {
    background: var(--card); border: 1px solid var(--border); border-radius: 6px;
    padding: 12px 16px; color: var(--text); font-size: 14px; font-family: 'Inter', sans-serif;
    outline: none; transition: border-color 0.2s; resize: none;
  }
  .form-group input:focus, .form-group textarea:focus { border-color: var(--accent2); }
  .form-group textarea { min-height: 120px; }
  .form-submit {
    background: var(--accent); color: #fff; border: none;
    padding: 14px 32px; border-radius: 4px;
    font-family: 'Syne', sans-serif; font-weight: 700; font-size: 14px;
    letter-spacing: 0.06em; cursor: pointer; transition: opacity 0.2s;
    width: 100%;
  }
  .form-submit:hover { opacity: 0.85; }

  /* ── FOOTER ── */
  footer {
    background: var(--bg); padding: 24px 48px;
    border-top: 1px solid var(--border);
    display: flex; justify-content: space-between; align-items: center;
    flex-wrap: wrap; gap: 12px;
  }
  .footer-logo { font-family: 'Syne', sans-serif; font-weight: 800; color: var(--white); font-size: 16px; }
  .footer-logo span { color: var(--accent); }
  .footer-copy { font-size: 13px; color: var(--muted); }
  .footer-links { display: flex; gap: 20px; }
  .footer-links a { font-size: 13px; color: var(--muted); text-decoration: none; transition: color 0.2s; }
  .footer-links a:hover { color: var(--accent); }

  /* ── MOBILE ── */
  @media (max-width: 900px) {
    nav { padding: 16px 24px; }
    .nav-links { display: none; }
    #hero { grid-template-columns: 1fr; padding: 110px 24px 60px; text-align: center; }
    .hero-desc { margin: 0 auto 36px; }
    .hero-stats { justify-content: center; }
    .hero-btns { justify-content: center; }
    .hero-right { display: none; }
    section { padding: 64px 24px; }
    .divider { margin: 0 24px; }
    .services-grid { grid-template-columns: 1fr; }
    .skills-layout { grid-template-columns: 1fr; gap: 32px; }
    .edu-grid { grid-template-columns: 1fr; }
    .projects-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    footer { flex-direction: column; align-items: flex-start; padding: 24px; }
  }
  @media (max-width: 600px) {
    .hero-stats { gap: 20px; }
    .stat-num { font-size: 26px; }
  }

  /* ── ANIMATIONS ── */
  .fade-in { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
  .fade-in.visible { opacity: 1; transform: none; }