:root {
      --bg: #05080F;
      --bg2: #0D1117;
      --surface: #161B22;
      --border: rgba(255,255,255,0.07);
      --text: #CBD5E1;
      --text-muted: #8B97A8;
      --white: #F0F6FC;
      --g1: #FF7B72;
      --g2: #F0883E;
      --g3: #E3B341;
      --g4: #3FB950;
      --g5: #58A6FF;
      --g6: #BC8CFF;
      --accent: #58A6FF;
      --accent2: #3FB950;
    }

    *, *::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-weight: 300;
      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: 1rem 1.5rem;
      background: rgba(5,8,15,0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border);
    }

    .nav-logo {
      font-family: 'Syne', sans-serif;
      font-weight: 800;
      font-size: 1.1rem;
      color: var(--white);
      text-decoration: none;
      letter-spacing: -0.02em;
    }

    .nav-logo span {
      background: linear-gradient(90deg, var(--g5), var(--g6));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .nav-links {
      display: flex; gap: 1.5rem; list-style: none;
    }

    .nav-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.85rem;
      font-weight: 400;
      letter-spacing: 0.03em;
      transition: color 0.2s;
    }

    .nav-links a:hover { color: var(--white); }

    .nav-cta {
      background: var(--g5);
      color: var(--bg) !important;
      padding: 0.4rem 0.9rem;
      border-radius: 6px;
      font-weight: 500 !important;
      transition: opacity 0.2s !important;
    }

    .nav-cta:hover { opacity: 0.85; color: var(--bg) !important; }

    @media (max-width: 600px) {
      .nav-links { gap: 0.9rem; }
      .nav-links li:not(:last-child):not(:nth-last-child(2)) { display: none; }
    }

    /* ── GRADIENT STRIP ── */
    .gradient-strip {
      height: 3px;
      background: linear-gradient(90deg, var(--g1), var(--g2), var(--g3), var(--g4), var(--g5), var(--g6), var(--g4), var(--g5));
      background-size: 200% 100%;
      animation: shimmer 4s linear infinite;
      margin-top: 64px;
    }

    @media (max-width: 480px) {
      .gradient-strip { margin-top: 60px; }
    }

    @keyframes shimmer {
      0% { background-position: 0% 50%; }
      100% { background-position: 200% 50%; }
    }

    /* ── HERO ── */
    .hero {
      min-height: 92vh;
      display: flex; flex-direction: column;
      justify-content: center; align-items: center;
      text-align: center;
      padding: 5.5rem 1.5rem 3rem;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute; inset: 0;
      background: radial-gradient(ellipse 80% 60% at 50% 40%, rgba(88,166,255,0.07) 0%, transparent 70%),
                  radial-gradient(ellipse 60% 40% at 20% 80%, rgba(188,140,255,0.05) 0%, transparent 60%);
      pointer-events: none;
    }

    .hero-badge {
      display: inline-flex; align-items: center; gap: 0.5rem;
      background: rgba(88,166,255,0.08);
      border: 1px solid rgba(88,166,255,0.2);
      border-radius: 100px;
      padding: 0.35rem 1rem;
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.72rem;
      color: var(--g5);
      letter-spacing: 0.08em;
      margin-bottom: 1.5rem;
      animation: fadeUp 0.6s ease both;
    }

    .hero-badge::before {
      content: '';
      width: 6px; height: 6px;
      border-radius: 50%;
      background: var(--g4);
      box-shadow: 0 0 6px var(--g4);
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0%, 100% { opacity: 1; }
      50% { opacity: 0.3; }
    }

    .hero h1 {
      font-family: 'Syne', sans-serif;
      font-weight: 700;
      font-size: clamp(2rem, 6vw, 4.5rem);
      line-height: 1.1;
      color: var(--white);
      letter-spacing: -0.03em;
      margin-bottom: 0.5rem;
      animation: fadeUp 0.6s 0.1s ease both;
    }

    .hero-name-accent {
      background: linear-gradient(135deg, var(--g5) 0%, var(--g6) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-tagline {
      font-family: 'JetBrains Mono', monospace;
      font-size: clamp(0.85rem, 2.5vw, 1.05rem);
      color: var(--g3);
      letter-spacing: 0.04em;
      margin-bottom: 1.5rem;
      animation: fadeUp 0.6s 0.2s ease both;
    }

    .hero-desc {
      max-width: 560px;
      font-size: clamp(0.95rem, 2vw, 1.05rem);
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 2.5rem;
      animation: fadeUp 0.6s 0.3s ease both;
    }

    .hero-desc strong { color: var(--text); font-weight: 500; }

    .hero-stats {
      display: flex; gap: 2rem; justify-content: center; flex-wrap: wrap;
      margin-bottom: 2.5rem;
      animation: fadeUp 0.6s 0.4s ease both;
    }

    .stat {
      text-align: center;
    }

    .stat-num {
      font-family: 'Syne', sans-serif;
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--white);
      line-height: 1;
    }

    .stat-num span {
      background: linear-gradient(135deg, var(--g4), var(--g5));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .stat-label {
      font-size: 0.72rem;
      color: var(--text-muted);
      letter-spacing: 0.06em;
      text-transform: uppercase;
      margin-top: 0.25rem;
    }

    .hero-avatar {
      width: 130px; height: 130px;
      border-radius: 50%;
      object-fit: cover;
      border: 3px solid rgba(88,166,255,0.35);
      box-shadow: 0 0 0 6px rgba(88,166,255,0.08), 0 8px 32px rgba(0,0,0,0.4);
      margin-bottom: 1.5rem;
      animation: fadeUp 0.6s ease both;
      object-position: top center;
    }

    .hero-actions {
      display: flex; gap: 1rem; flex-wrap: wrap; justify-content: center;
      animation: fadeUp 0.6s 0.5s ease both;
    }

    .btn-primary {
      display: inline-flex; align-items: center; gap: 0.5rem;
      background: var(--g5);
      color: #05080F;
      font-family: 'Syne', sans-serif;
      font-weight: 700;
      font-size: 0.9rem;
      padding: 0.75rem 1.6rem;
      border-radius: 8px;
      text-decoration: none;
      letter-spacing: 0.01em;
      transition: transform 0.2s, box-shadow 0.2s;
      box-shadow: 0 0 0 rgba(88,166,255,0);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(88,166,255,0.3);
    }

    .btn-secondary {
      display: inline-flex; align-items: center; gap: 0.5rem;
      background: transparent;
      color: var(--white);
      font-family: 'Syne', sans-serif;
      font-weight: 600;
      font-size: 0.9rem;
      padding: 0.75rem 1.6rem;
      border-radius: 8px;
      border: 1px solid var(--border);
      text-decoration: none;
      transition: border-color 0.2s, background 0.2s;
    }

    .btn-secondary:hover {
      border-color: rgba(255,255,255,0.2);
      background: rgba(255,255,255,0.04);
    }

    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(20px); }
      to   { opacity: 1; transform: translateY(0); }
    }

    /* ── SECTIONS ── */
    section { padding: 5rem 1.5rem; max-width: 1100px; margin: 0 auto; }

    .section-label {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.72rem;
      color: var(--g5);
      letter-spacing: 0.12em;
      text-transform: uppercase;
      margin-bottom: 0.5rem;
    }

    .section-title {
      font-family: 'Syne', sans-serif;
      font-weight: 800;
      font-size: clamp(1.8rem, 5vw, 2.8rem);
      color: var(--white);
      letter-spacing: -0.02em;
      line-height: 1.1;
      margin-bottom: 1rem;
    }

    .section-sub {
      color: var(--text-muted);
      font-size: 1rem;
      max-width: 560px;
      margin-bottom: 3rem;
    }

    /* ── CREDENTIALS ── */
    .creds-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 1rem;
    }

    .cred-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 1.5rem;
      position: relative;
      overflow: hidden;
      transition: border-color 0.2s, transform 0.2s;
    }

    .cred-card:hover {
      border-color: rgba(88,166,255,0.25);
      transform: translateY(-3px);
    }

    .cred-card::before {
      content: '';
      position: absolute; top: 0; left: 0; right: 0;
      height: 2px;
    }

    .cred-card:nth-child(1)::before { background: linear-gradient(90deg, var(--g5), var(--g6)); }
    .cred-card:nth-child(2)::before { background: linear-gradient(90deg, var(--g3), var(--g2)); }
    .cred-card:nth-child(3)::before { background: linear-gradient(90deg, var(--g4), var(--g5)); }
    .cred-card:nth-child(4)::before { background: linear-gradient(90deg, var(--g6), var(--g1)); }

    .cred-icon { font-size: 1.8rem; margin-bottom: 0.75rem; }

    .cred-num {
      font-family: 'Syne', sans-serif;
      font-size: 2rem;
      font-weight: 800;
      color: var(--white);
      line-height: 1;
    }

    .cred-label {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-top: 0.25rem;
    }

    /* ── EXPERTISE TAGS ── */
    .tags-wrap {
      display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 2.5rem;
    }

    .tag {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.78rem;
      padding: 0.35rem 0.85rem;
      border-radius: 6px;
      border: 1px solid var(--border);
      color: var(--text);
      background: rgba(255,255,255,0.03);
      transition: border-color 0.2s, color 0.2s;
    }

    .tag:hover { border-color: var(--g5); color: var(--g5); }

    .course-card.featured {
      border-color: rgba(227,179,65,0.35);
      background: linear-gradient(145deg, #161B22 0%, #1a1f28 100%);
      grid-column: 1 / -1;
    }

    .course-card.featured:hover {
      border-color: rgba(227,179,65,0.6);
      box-shadow: 0 16px 48px rgba(227,179,65,0.12);
    }

    @media (min-width: 700px) {
      .course-card.featured {
        display: grid;
        grid-template-columns: 1fr auto;
        grid-template-rows: auto auto 1fr auto;
        column-gap: 2rem;
      }
      .course-card.featured .course-tech-badge { grid-column: 1; }
      .course-card.featured .course-title      { grid-column: 1; font-size: 1.25rem; }
      .course-card.featured .course-desc       { grid-column: 1; }
      .course-card.featured .course-footer     { grid-column: 1 / -1; }
      .course-card.featured .featured-pill     { grid-column: 2; grid-row: 1 / 3; align-self: start; justify-self: end; }
    }

    .featured-pill {
      display: inline-flex; align-items: center; gap: 0.4rem;
      background: linear-gradient(135deg, rgba(227,179,65,0.15), rgba(240,136,62,0.1));
      border: 1px solid rgba(227,179,65,0.4);
      border-radius: 100px;
      padding: 0.35rem 0.9rem;
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.68rem;
      color: var(--g3);
      letter-spacing: 0.08em;
      white-space: nowrap;
    }

    .featured-pill::before {
      content: '';
      width: 6px; height: 6px;
      border-radius: 50%;
      background: var(--g3);
      box-shadow: 0 0 6px var(--g3);
      animation: pulse 2s infinite;
    }

    .course-card.featured .course-tech-badge {
      color: var(--g3);
      background: rgba(227,179,65,0.08);
      border-color: rgba(227,179,65,0.2);
    }

    .course-card.featured .course-cta { color: var(--g3); }
    .courses-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
      gap: 1.25rem;
    }

    .course-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 14px;
      padding: 1.5rem;
      text-decoration: none;
      display: flex; flex-direction: column;
      gap: 0.75rem;
      position: relative;
      overflow: hidden;
      transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
    }

    .course-card:hover {
      border-color: rgba(88,166,255,0.3);
      transform: translateY(-4px);
      box-shadow: 0 16px 40px rgba(0,0,0,0.4);
    }

    .course-tech-badge {
      display: inline-flex; align-items: center; gap: 0.35rem;
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.68rem;
      color: var(--g5);
      background: rgba(88,166,255,0.08);
      border: 1px solid rgba(88,166,255,0.15);
      padding: 0.25rem 0.6rem;
      border-radius: 4px;
      letter-spacing: 0.05em;
      width: fit-content;
    }

    .course-title {
      font-family: 'Syne', sans-serif;
      font-weight: 700;
      font-size: 1.05rem;
      color: var(--white);
      line-height: 1.3;
    }

    .course-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex: 1;
    }

    .course-footer {
      display: flex; align-items: center; justify-content: space-between;
      margin-top: 0.5rem;
    }

    .course-cta {
      font-family: 'Syne', sans-serif;
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--g5);
      display: flex; align-items: center; gap: 0.35rem;
    }

    .course-coupon {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.65rem;
      color: var(--g4);
      background: rgba(63,185,80,0.08);
      border: 1px solid rgba(63,185,80,0.2);
      padding: 0.2rem 0.5rem;
      border-radius: 4px;
    }

    /* ── LINKEDIN CTA ── */
    .linkedin-section {
      text-align: center;
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 20px;
      padding: 4rem 2rem;
      max-width: 760px;
      margin: 0 auto;
      position: relative;
      overflow: hidden;
    }

    .linkedin-section::before {
      content: '';
      position: absolute; inset: 0;
      background: radial-gradient(ellipse 70% 50% at 50% 50%, rgba(88,166,255,0.06) 0%, transparent 70%);
      pointer-events: none;
    }

    .linkedin-icon {
      width: 64px; height: 64px;
      background: #0A66C2;
      border-radius: 16px;
      display: flex; align-items: center; justify-content: center;
      margin: 0 auto 1.5rem;
      font-size: 1.8rem;
    }

    .linkedin-section h2 {
      font-family: 'Syne', sans-serif;
      font-weight: 800;
      font-size: clamp(1.6rem, 4vw, 2.2rem);
      color: var(--white);
      letter-spacing: -0.02em;
      margin-bottom: 0.75rem;
    }

    .linkedin-section p {
      color: var(--text-muted);
      max-width: 480px;
      margin: 0 auto 2rem;
      font-size: 0.95rem;
    }

    .btn-linkedin {
      display: inline-flex; align-items: center; gap: 0.5rem;
      background: #0A66C2;
      color: #fff;
      font-family: 'Syne', sans-serif;
      font-weight: 700;
      font-size: 1rem;
      padding: 0.85rem 2rem;
      border-radius: 10px;
      text-decoration: none;
      transition: transform 0.2s, box-shadow 0.2s;
    }

    .btn-linkedin:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 28px rgba(10,102,194,0.4);
    }

    /* ── FOOTER ── */
    footer {
      border-top: 1px solid var(--border);
      padding: 2.5rem 1.5rem;
      text-align: center;
    }

    .footer-inner {
      max-width: 1100px;
      margin: 0 auto;
      display: flex; flex-direction: column; align-items: center; gap: 1rem;
    }

    .footer-brand {
      font-family: 'Syne', sans-serif;
      font-weight: 800;
      font-size: 1.1rem;
      color: var(--white);
    }

    .footer-tagline {
      font-family: 'JetBrains Mono', monospace;
      font-size: 0.75rem;
      color: var(--g3);
      letter-spacing: 0.06em;
    }

    .footer-links {
      display: flex; gap: 1.5rem; flex-wrap: wrap; justify-content: center;
    }

    .footer-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.82rem;
      transition: color 0.2s;
    }

    .footer-links a:hover { color: var(--white); }

    .footer-copy {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* ── DIVIDER ── */
    .divider {
      height: 1px;
      background: var(--border);
      max-width: 1100px;
      margin: 0 auto;
    }

    /* ── SCROLL REVEAL ── */
    .reveal {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }

    .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* ── BACK-TO-TOP ── */
    #btt {
      position: fixed; bottom: 1.5rem; right: 1.5rem; z-index: 99;
      width: 40px; height: 40px;
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 10px;
      display: flex; align-items: center; justify-content: center;
      color: var(--text-muted);
      text-decoration: none;
      font-size: 1.1rem;
      transition: opacity 0.3s, border-color 0.2s;
      opacity: 0;
      pointer-events: none;
    }

    #btt.show { opacity: 1; pointer-events: auto; }
    #btt:hover { border-color: var(--g5); color: var(--g5); }

    /* ── RESPONSIVE NAV ── */
    @media (max-width: 480px) {
      nav { padding: 0.9rem 1rem; }
      .nav-logo { font-size: 1rem; }
    }