:root {
      --bg: #060b16;
      --card: rgba(15, 23, 42, 0.6);
      --border: rgba(255, 255, 255, 0.08);
      --blue: #3b82f6;
      --blue-light: #60a5fa;
      --orange: #F49221;
      --text: #f8fafc;
      --muted: #94a3b8;
      --green: #22C55E;
      --radius: 18px;
      --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    }

    * { margin: 0; padding: 0; box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      font-family: 'Inter', system-ui, sans-serif;
      background: var(--bg);
      color: var(--text);
      min-height: 100vh;
      overflow-x: hidden;
      position: relative;
    }

    body::before {
      content: '';
      position: fixed;
      inset: 0;
      background-image: 
        linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
      background-size: 70px 70px;
      pointer-events: none;
      z-index: 0;
    }

    .bg-orb {
      position: fixed;
      border-radius: 50%;
      filter: blur(110px);
      opacity: 0.12;
      pointer-events: none;
      z-index: 0;
      animation: float 22s infinite ease-in-out;
    }
    .orb1 { width: 480px; height: 480px; background: #3b82f6; top: -140px; left: -120px; }
    .orb2 { width: 360px; height: 360px; background: #f97316; bottom: 0; right: -100px; animation-delay: -8s; }
    .orb3 { width: 300px; height: 300px; background: #8b5cf6; top: 40%; left: 55%; animation-delay: -15s; }
    @keyframes float {
      0%, 100% { transform: translate(0, 0); }
      50% { transform: translate(30px, -40px); }
    }

    .reveal {
      opacity: 0;
      transform: translateY(30px);
      transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .reveal.active { opacity: 1; transform: translateY(0); }
    .reveal-left {
      opacity: 0;
      transform: translateX(-40px);
      transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .reveal-left.active { opacity: 1; transform: translateX(0); }
    .reveal-right {
      opacity: 0;
      transform: translateX(40px);
      transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .reveal-right.active { opacity: 1; transform: translateX(0); }

    .app {
      display: flex;
      min-height: 100vh;
      position: relative;
      z-index: 1;
    }

    /* Desktop Sidebar */
    .sidebar {
      position: fixed;
      left: 24px;
      top: 50%;
      transform: translateY(-50%);
      width: 60px;
      background: rgba(15, 23, 42, 0.7);
      backdrop-filter: blur(18px);
      border: 1px solid var(--border);
      border-radius: 30px;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 16px 0;
      gap: 8px;
      z-index: 100;
      box-shadow: var(--shadow);
    }
    .nav-icon {
      width: 42px;
      height: 42px;
      border-radius: 13px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #94a3b8;
      font-size: 17px;
      cursor: pointer;
      transition: all 0.25s;
      text-decoration: none;
    }
    .nav-icon:hover {
      color: #e2e8f0;
      background: rgba(255,255,255,0.06);
    }
    .nav-icon.active {
      background: linear-gradient(135deg, #3b82f6, #f97316);
      color: white;
    }

    /* ===== FLOATING BOTTOM NAV (Mobile + Tablet) ===== */
    .bottom-nav {
      display: none;
      position: fixed;
      bottom: 24px;
      left: 50%;
      transform: translateX(-50%);
      background: rgba(15, 23, 42, 0.85);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: 50px;
      padding: 10px 18px;
      gap: 6px;
      z-index: 100;
      box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
      justify-content: center;
      align-items: center;
    }
    .bottom-nav .nav-icon {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      font-size: 18px;
    }

    .main {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 48px 50px 70px 120px;
    }

    /* HERO */
    .hero {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 70px;
      align-items: center;
      margin-bottom: 70px;
    }
    .hero-left { max-width: 580px; }

    /* Status Badge */
    .status-badge {
      display: inline-flex;
      flex-direction: column;
      gap: 4px;
      background: rgba(34, 197, 94, 0.15);
      border: 1px solid rgba(34, 197, 94, 0.35);
      border-radius: 14px;
      padding: 12px 18px;
      margin-bottom: 26px;
      max-width: fit-content;
      transition: all 0.3s ease;
    }
    .status-badge.unavailable {
      background: rgba(244, 146, 33, 0.15);
      border-color: rgba(244, 146, 33, 0.4);
    }
    .status-main {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      font-weight: 600;
    }
    .status-badge.available .status-main { color: #22C55E; }
    .status-badge.unavailable .status-main { color: #F49221; }

    .status-dot {
      width: 9px;
      height: 9px;
      border-radius: 50%;
      position: relative;
      flex-shrink: 0;
    }
    .status-badge.available .status-dot { background: #22C55E; }
    .status-badge.unavailable .status-dot { background: #F49221; }
    .status-dot::after {
      content: '';
      position: absolute;
      inset: -4px;
      border-radius: 50%;
      border: 1.5px solid currentColor;
      animation: pulse-ring 1.8s ease-out infinite;
      opacity: 0.7;
    }
    @keyframes pulse-ring {
      0% { transform: scale(0.7); opacity: 0.8; }
      100% { transform: scale(1.7); opacity: 0; }
    }
    .status-sub {
      font-size: 12.5px;
      color: var(--muted);
      padding-left: 17px;
      line-height: 1.45;
    }

    .hello {
      color: var(--muted);
      font-size: 1.1rem;
      margin-bottom: 10px;
    }
    .hero-left h1 {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.08;
      margin-bottom: 14px;
      letter-spacing: -1.2px;
    }
    .typing-wrapper {
      margin-bottom: 22px;
      min-height: 36px;
    }
    .typing {
      font-size: 1.35rem;
      font-weight: 500;
      color: #e2e8f0;
    }
    .typing span {
      color: var(--orange);
      font-weight: 600;
    }
    .cursor {
      display: inline-block;
      width: 2px;
      height: 1.25em;
      background: var(--orange);
      margin-left: 4px;
      animation: blink 0.75s infinite;
      vertical-align: middle;
    }
    @keyframes blink {
      0%, 100% { opacity: 1; }
      50% { opacity: 0; }
    }

    .badges {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-bottom: 28px;
    }
    .badge-item {
      background: rgba(15, 23, 42, 0.65);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.09);
      color: #e2e8f0;
      font-size: 13px;
      font-weight: 500;
      padding: 8px 16px;
      border-radius: 999px;
      display: inline-flex;
      align-items: center;
      gap: 7px;
      transition: all 0.3s ease;
    }
    .badge-item:hover {
      border-color: rgba(59, 130, 246, 0.4);
      transform: translateY(-3px);
    }
    .badge-item i {
      font-size: 13px;
      color: var(--blue-light);
    }

    .desc {
      color: var(--muted);
      font-size: 1.02rem;
      line-height: 1.7;
      margin-bottom: 30px;
      max-width: 520px;
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      margin-bottom: 24px;
      max-width: 480px;
    }
    .contact-card {
      background: rgba(15, 23, 42, 0.6);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border);
      border-radius: 14px;
      padding: 14px 16px;
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
      color: inherit;
      text-align: left;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }
    .contact-card:hover {
      border-color: rgba(59, 130, 246, 0.35);
      transform: translateY(-3px);
    }
    .contact-card i {
      font-size: 17px;
      width: 22px;
      min-width: 22px;
      text-align: center;
      flex-shrink: 0;
    }
    .contact-card .wa { color: #25d366; }
    .contact-card .call { color: #F49221; }
    .contact-card .mail { color: #F49221; }
    .contact-card .web { color: #F49221; }
    .contact-card > div {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      min-width: 0;
    }
    .contact-card strong {
      display: block;
      font-size: 13.5px;
      font-weight: 600;
      line-height: 1.3;
    }
    .contact-card span {
      font-size: 12px;
      color: var(--muted);
      line-height: 1.35;
      word-break: break-all;
    }

    .action-btns {
      display: flex;
      gap: 12px;
      margin-bottom: 22px;
    }
    .btn {
      padding: 13px 24px;
      border-radius: 12px;
      font-weight: 600;
      font-size: 14px;
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }
    .btn-primary {
      background: linear-gradient(135deg, #2563eb, #1d4ed8);
      color: white;
      box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
    }
    .btn-primary:hover {
      transform: translateY(-3px);
      box-shadow: 0 10px 28px rgba(37, 99, 235, 0.4);
    }
    .btn-outline {
      background: rgba(15, 23, 42, 0.5);
      color: var(--text);
      border: 1px solid var(--border);
    }
    .btn-outline:hover {
      border-color: rgba(59, 130, 246, 0.4);
      transform: translateY(-3px);
    }

    .ripple {
      position: absolute;
      border-radius: 50%;
      background: rgba(255,255,255,0.3);
      transform: scale(0);
      animation: ripple-anim 0.55s linear;
      pointer-events: none;
    }
    @keyframes ripple-anim {
      to { transform: scale(4); opacity: 0; }
    }

    .social-row {
      display: flex;
      gap: 10px;
    }
    .social-btn {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: rgba(15, 23, 42, 0.6);
      border: 1px solid var(--border);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--muted);
      font-size: 15px;
      transition: all 0.3s;
      text-decoration: none;
      position: relative;
      overflow: hidden;
    }
    .social-btn:hover {
      color: white;
      border-color: rgba(59, 130, 246, 0.4);
      transform: translateY(-3px);
    }

    .hero-right {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 28px;
    }
    .avatar-container {
      position: relative;
      width: 340px;
      height: 340px;
      animation: floatAvatar 5s ease-in-out infinite;
    }
    @keyframes floatAvatar {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-12px); }
    }
    .avatar-ring {
      position: absolute;
      inset: 0;
      border-radius: 50%;
      padding: 5px;
      background: linear-gradient(135deg, #3b82f6, #f97316, #8b5cf6, #3b82f6);
      background-size: 300% 300%;
      animation: gradientRotate 6s ease infinite;
    }
    @keyframes gradientRotate {
      0% { background-position: 0% 50%; }
      50% { background-position: 100% 50%; }
      100% { background-position: 0% 50%; }
    }
    .avatar-ring::before {
      content: '';
      position: absolute;
      inset: -10px;
      border-radius: 50%;
      border: 1.5px solid rgba(59, 130, 246, 0.22);
    }
    .avatar {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      object-fit: cover;
      border: 5px solid #060b16;
      display: block;
      position: relative;
      z-index: 2;
    }
    .avatar-glow {
      position: absolute;
      inset: 20px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(59, 130, 246, 0.22) 0%, transparent 70%);
      filter: blur(18px);
      z-index: 1;
    }

    .digital-card {
      background: rgba(15, 23, 42, 0.65);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border);
      border-radius: 18px;
      padding: 22px;
      text-align: center;
      width: 200px;
      box-shadow: var(--shadow);
      transition: all 0.35s ease;
    }
    .digital-card:hover {
      transform: translateY(-8px);
      border-color: rgba(59, 130, 246, 0.3);
    }
    .digital-card h4 {
      font-size: 13px;
      font-weight: 500;
      color: var(--muted);
      margin-bottom: 14px;
    }
    .qr-box {
      width: 140px;
      height: 140px;
      background: white;
      border-radius: 12px;
      margin: 0 auto 12px;
      overflow: hidden;
    }
    .qr-box img {
      width: 100%;
      height: 100%;
      object-fit: contain;
    }
    .digital-card p {
      font-size: 12px;
      color: var(--muted);
      line-height: 1.4;
    }

    /* Stacked Sections */
    .section-stack {
      display: flex;
      flex-direction: column;
      gap: 28px;
      margin-bottom: 40px;
    }
    .card {
      background: rgba(15, 23, 42, 0.6);
      backdrop-filter: blur(14px);
      border: 1px solid var(--border);
      border-radius: 18px;
      padding: 32px;
      box-shadow: var(--shadow);
      transition: all 0.3s ease;
    }
    .card:hover {
      border-color: rgba(59, 130, 246, 0.25);
      transform: translateY(-4px);
    }
    .card-title {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 20px;
    }
    .card-title i { color: var(--blue-light); }
    .about-tagline {
      font-size: 1.2rem;
      font-weight: 600;
      color: #e2e8f0;
      line-height: 1.45;
      margin-bottom: 18px;
      letter-spacing: -0.2px;
    }
    .about-text {
      color: var(--muted);
      font-size: 1rem;
      line-height: 1.75;
      margin-bottom: 16px;
    }
    .about-text:last-of-type {
      margin-bottom: 22px;
    }
    .signature {
      font-family: 'Great Vibes', 'Brush Script MT', cursive;
      font-size: 2.4rem;
      font-weight: 400;
      color: #93c5fd;
      opacity: 0.9;
      letter-spacing: 1px;
      line-height: 1.3;
      margin-top: 4px;
    }
    .exp-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }
    .exp-item {
      background: rgba(15, 23, 42, 0.5);
      border: 1px solid var(--border);
      border-radius: 14px;
      padding: 22px 16px;
      text-align: center;
      transition: all 0.25s;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }
    .exp-item:hover {
      border-color: rgba(59, 130, 246, 0.3);
      transform: translateY(-4px);
    }
    .exp-item i {
      font-size: 26px;
      margin-bottom: 4px;
      display: block;
    }
    .exp-item:nth-child(1) i { color: #60a5fa; }
    .exp-item:nth-child(2) i { color: #F49221; }
    .exp-item:nth-child(3) i { color: #38bdf8; }
    .exp-item:nth-child(4) i { color: #fbbf24; }
    .exp-item:nth-child(5) i { color: #a78bfa; }
    .exp-item:nth-child(6) i { color: #fb923c; }
    .exp-item:nth-child(7) i { color: #34d399; }
    .exp-item:nth-child(8) i { color: #f472b6; }
    .exp-item:nth-child(9) i { color: #22d3ee; }
    .exp-item strong {
      font-size: 14px;
      font-weight: 600;
      color: #e2e8f0;
      line-height: 1.3;
      display: block;
    }
    .exp-item span {
      font-size: 11.5px;
      color: var(--muted);
      line-height: 1.45;
      display: block;
    }

    /* Technologies */
    .tech-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
      gap: 12px;
    }
    .tech-item {
      background: rgba(15, 23, 42, 0.5);
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 18px 12px;
      text-align: center;
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 12px;
    }
    .tech-item:hover {
      border-color: rgba(59, 130, 246, 0.35);
      transform: translateY(-3px);
      background: rgba(15, 23, 42, 0.7);
    }
    .tech-item img {
      width: 28px;
      height: 28px;
      object-fit: contain;
    }

    /* Dahua, Hikvision, UNV – বড় logo */
    .tech-item img[alt="Dahua"],
    .tech-item img[alt="Hikvision"],
    .tech-item img[alt="Uniview"] {
      width: 48px;
      height: 48px;
    }
    .tech-item i {
      font-size: 26px;
      line-height: 28px;
      height: 28px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .tech-item span {
      font-size: 13px;
      font-weight: 500;
      color: #e2e8f0;
      line-height: 1.3;
    }

    .edu-item {
      display: flex;
      gap: 16px;
      position: relative;
      padding-left: 6px;
    }
    .edu-item::before {
      content: '';
      position: absolute;
      left: 0; top: 8px; bottom: 0;
      width: 2px;
      background: linear-gradient(to bottom, var(--blue), transparent);
    }
    .edu-dot {
      width: 11px; height: 11px;
      background: var(--blue);
      border-radius: 50%;
      margin-top: 6px;
      flex-shrink: 0;
    }
    .edu-content h4 { font-size: 1.05rem; margin-bottom: 6px; }
    .badge {
      display: inline-block;
      background: rgba(34, 197, 94, 0.12);
      color: #22C55E;
      font-size: 12px;
      padding: 3px 11px;
      border-radius: 999px;
      margin-left: 8px;
    }
    .edu-content p { font-size: 14px; color: var(--muted); margin-top: 4px; }

    .cert-list { display: flex; flex-direction: column; gap: 12px; }
    .cert-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: rgba(15, 23, 42, 0.5);
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 16px 18px;
      transition: all 0.25s;
    }
    .cert-item:hover {
      border-color: rgba(59, 130, 246, 0.3);
      transform: translateX(6px);
    }
    .cert-item .left {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .cert-item i { color: #60a5fa; font-size: 16px; }
    .cert-item span { font-size: 14.5px; }
    .view-btn {
      background: transparent;
      border: 1px solid var(--border);
      color: var(--blue-light);
      font-size: 13px;
      padding: 6px 16px;
      border-radius: 8px;
      cursor: pointer;
      transition: all 0.2s;
      position: relative;
      overflow: hidden;
    }
    .view-btn:hover {
      border-color: rgba(59, 130, 246, 0.4);
      background: rgba(59, 130, 246, 0.08);
    }
    .view-all {
      margin-left: auto;
      background: transparent;
      border: 1px solid var(--border);
      color: var(--muted);
      font-size: 13px;
      padding: 5px 14px;
      border-radius: 8px;
      cursor: pointer;
    }

    .stats { margin: 40px 0; }
    .stats-inner {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      background: rgba(15, 23, 42, 0.6);
      backdrop-filter: blur(14px);
      border: 1px solid var(--border);
      border-radius: 18px;
      overflow: hidden;
      box-shadow: var(--shadow);
    }
    .stat {
      display: flex;
      align-items: center;
      gap: 16px;
      padding: 28px 24px;
      border-right: 1px solid var(--border);
      transition: background 0.25s;
    }
    .stat:hover { background: rgba(255,255,255,0.03); }
    .stat:last-child { border-right: none; }
    .stat-icon {
      width: 48px; height: 48px;
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      flex-shrink: 0;
      background: rgba(59, 130, 246, 0.1);
      color: #60a5fa;
    }
    .stat:nth-child(2) .stat-icon { background: rgba(244,146,33,0.1); color: #F49221; }
    .stat:nth-child(3) .stat-icon { background: rgba(168,85,247,0.1); color: #c084fc; }
    .stat:nth-child(4) .stat-icon { background: rgba(34,197,94,0.1); color: #22C55E; }
    .stat strong { font-size: 1.5rem; display: block; }
    .stat span { font-size: 13.5px; color: var(--muted); }

    /* CTA */
    .cta-section { margin-top: 20px; }
    .cta-card {
      background: rgba(12, 20, 40, 0.75);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: 20px;
      padding: 32px 40px;
      display: grid;
      grid-template-columns: 1.3fr auto 1fr auto 0.9fr;
      align-items: center;
      position: relative;
      overflow: hidden;
      box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    }
    .cta-card::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, #3b82f6, #8b5cf6, #F49221);
      opacity: 0.7;
    }
    .cta-left h3 {
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .cta-left h3 span { color: var(--orange); }
    .cta-left p {
      color: var(--muted);
      font-size: 0.95rem;
      line-height: 1.55;
      margin-bottom: 20px;
      max-width: 320px;
    }
    .cta-btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #2563eb;
      color: white;
      font-weight: 600;
      font-size: 14px;
      padding: 12px 24px;
      border-radius: 10px;
      text-decoration: none;
      transition: all 0.3s;
      border: none;
      cursor: pointer;
    }
    .cta-btn:hover {
      background: #1d4ed8;
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
    }
    .cta-divider {
      width: 1px;
      height: 90px;
      background: rgba(255, 255, 255, 0.1);
      margin: 0 30px;
    }
    .cta-middle { text-align: center; }
    .cta-middle h4 {
      font-size: 1.05rem;
      font-weight: 600;
      margin-bottom: 18px;
      color: #e2e8f0;
    }
    .cta-socials {
      display: flex;
      justify-content: center;
      gap: 12px;
    }
    .cta-social {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 16px;
      text-decoration: none;
      transition: all 0.25s;
    }
    .cta-social:hover {
      transform: translateY(-4px) scale(1.08);
    }
    .cta-social.linkedin { background: #0A66C2; }
    .cta-social.github { background: #333; }
    .cta-social.facebook { background: #1877F2; }
    .cta-social.email { background: #EA4335; }
    .cta-right {
      text-align: left;
      padding-left: 10px;
    }
    .cta-right .loc-title {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.05rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: #e2e8f0;
    }
    .cta-right .loc-title i {
      color: #3b82f6;
      font-size: 16px;
    }
    .cta-right p {
      color: var(--muted);
      font-size: 0.95rem;
      padding-left: 24px;
    }

    footer {
      margin-top: 50px;
      padding: 30px 0 20px;
      border-top: 1px solid var(--border);
      text-align: center;
      color: var(--muted);
      font-size: 13.5px;
    }

    /* Lightbox & FAB */
    .lightbox {
      position: fixed;
      inset: 0;
      background: rgba(0, 0, 0, 0.85);
      display: none;
      align-items: center;
      justify-content: center;
      z-index: 1000;
      padding: 20px;
      backdrop-filter: blur(8px);
    }
    .lightbox.active { display: flex; }
    .lightbox-content {
      background: rgba(15, 23, 42, 0.95);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: 24px;
      max-width: 720px;
      width: 100%;
      max-height: 90vh;
      overflow-y: auto;
      padding: 40px 36px;
      text-align: center;
      position: relative;
      box-shadow: 0 25px 60px rgba(0, 0, 0, 0.5);
    }
    .lightbox-close {
      position: absolute;
      top: 16px;
      right: 22px;
      font-size: 28px;
      color: #94a3b8;
      cursor: pointer;
      line-height: 1;
      transition: color 0.2s;
      z-index: 2;
    }
    .lightbox-close:hover {
      color: #fff;
    }
    .lightbox-icon {
      font-size: 56px;
      color: #60a5fa;
      margin-bottom: 20px;
    }
    #certImage {
      display: none;
      max-width: 100%;
      max-height: 55vh;
      width: auto;
      height: auto;
      border-radius: 14px;
      margin: 0 auto 20px;
      object-fit: contain;
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
    }
    .lightbox h3 {
      font-size: 1.45rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: #f8fafc;
    }
    .lightbox p {
      color: #94a3b8;
      margin-bottom: 24px;
      font-size: 1rem;
      line-height: 1.5;
    }

    /* Mobile */
    @media (max-width: 600px) {
      .lightbox-content {
        max-width: 100%;
        padding: 28px 20px;
        border-radius: 18px;
      }
      #certImage {
        max-height: 45vh;
      }
      .lightbox h3 {
        font-size: 1.2rem;
      }
    }

    .fab-container {
      position: fixed;
      bottom: 28px; right: 28px;
      z-index: 200;
    }
    .fab-main {
      width: 56px; height: 56px;
      border-radius: 50%;
      background: linear-gradient(135deg, #3b82f6, #F49221);
      border: none;
      color: white;
      font-size: 22px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 6px 20px rgba(59, 130, 246, 0.35);
      transition: all 0.25s;
      position: relative;
      overflow: hidden;
    }
    .fab-main:hover { transform: scale(1.06); }
    .fab-main.open {
      transform: rotate(45deg);
      background: linear-gradient(135deg, #ef4444, #F49221);
    }
    .fab-actions {
      position: absolute;
      bottom: 70px; right: 0;
      display: flex;
      flex-direction: column;
      gap: 10px;
      opacity: 0;
      visibility: hidden;
      transform: translateY(16px);
      transition: all 0.25s;
    }
    .fab-actions.show {
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }
    .fab-btn {
      display: flex;
      align-items: center;
      gap: 10px;
      background: rgba(15, 23, 42, 0.85);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border);
      color: white;
      padding: 11px 16px;
      border-radius: 999px;
      font-size: 13.5px;
      font-weight: 500;
      text-decoration: none;
      white-space: nowrap;
      box-shadow: var(--shadow);
      transition: all 0.2s;
      cursor: pointer;
      position: relative;
      overflow: hidden;
    }
    .fab-btn:hover {
      border-color: rgba(59, 130, 246, 0.4);
      transform: translateX(-5px);
    }
    .fab-btn i { font-size: 15px; width: 18px; text-align: center; }

    /* ===== RESPONSIVE ===== */
    @media (max-width: 1100px) {
      .sidebar { display: none; }
      .bottom-nav { display: flex; }
      .main { padding: 30px 28px 120px; }
      
      .hero {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
        margin-bottom: 50px;
      }
      .hero-left { max-width: 100%; }
      .desc, .contact-grid { margin-left: auto; margin-right: auto; }
      .action-btns, .social-row, .badges { justify-content: center; }
      .status-badge { margin-left: auto; margin-right: auto; }
      .hero-right { order: -1; }
      
      .cta-card {
        grid-template-columns: 1fr;
        gap: 28px;
        text-align: center;
        padding: 28px 24px;
      }
      .cta-divider { display: none; }
      .cta-left p { margin-left: auto; margin-right: auto; }
      .cta-right { text-align: center; }
      .cta-right p { padding-left: 0; }
      .cta-right .loc-title { justify-content: center; }
      
      .fab-container { bottom: 100px; right: 20px; }
      .avatar-container { width: 280px; height: 280px; }
      
      .exp-grid { grid-template-columns: repeat(2, 1fr); }
      .tech-grid { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); }
    }
    
    @media (max-width: 768px) {
      .main { padding: 24px 20px 120px; }
      
      .stats-inner { grid-template-columns: 1fr 1fr; }
      .stat {
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding: 22px 18px;
        gap: 12px;
      }
      .stat:nth-child(2n) { border-right: none; }
      .stat:nth-child(3), .stat:nth-child(4) { border-bottom: none; }
      .stat-icon { width: 44px; height: 44px; font-size: 18px; }
      .stat strong { font-size: 1.35rem; }
      
      .exp-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
      .exp-item { padding: 18px 12px; }
      .exp-item i { font-size: 22px; }
      .exp-item strong { font-size: 13px; }
      .exp-item span { font-size: 11px; }
      
      .hero-left h1 { font-size: 2.5rem; letter-spacing: -0.8px; }
      .typing { font-size: 1.2rem; }
      .avatar-container { width: 220px; height: 220px; }
      .contact-grid { grid-template-columns: 1fr; max-width: 360px; }
      .contact-card { padding: 13px 14px; }
      
      .card { padding: 24px 20px; }
      .card-title { font-size: 1.15rem; margin-bottom: 16px; }
      .about-tagline { font-size: 1.1rem; }
      .about-text { font-size: 0.95rem; }
      .signature { font-size: 2rem; }
      
      .cert-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
        padding: 14px 16px;
      }
      .cert-item .left { width: 100%; }
      .cert-item .view-btn { align-self: flex-end; }
      
      .tech-grid { grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); gap: 10px; }
      .tech-item { padding: 14px 10px; gap: 10px; }
      .tech-item span { font-size: 12px; }
      
      .bottom-nav {
        bottom: 18px;
        padding: 8px 14px;
        gap: 4px;
      }
      .bottom-nav .nav-icon {
        width: 42px;
        height: 42px;
        font-size: 17px;
      }
      
      .digital-card { width: 180px; padding: 18px; }
      .qr-box { width: 120px; height: 120px; }
      
      .cta-left h3 { font-size: 1.25rem; }
      .cta-btn { width: 100%; max-width: 260px; justify-content: center; }
    }
    
    @media (max-width: 480px) {
      .main { padding: 18px 14px 110px; }
      
      .hero { gap: 32px; margin-bottom: 36px; }
      .hero-left h1 { font-size: 2.05rem; line-height: 1.12; letter-spacing: -0.6px; }
      .hello { font-size: 1rem; }
      .typing { font-size: 1.05rem; }
      .typing-wrapper { min-height: 30px; margin-bottom: 16px; }
      .desc { font-size: 0.95rem; margin-bottom: 22px; }
      
      .status-badge { padding: 10px 14px; margin-bottom: 20px; }
      .status-main { font-size: 13px; }
      .status-sub { font-size: 11.5px; }
      
      .badges { gap: 8px; margin-bottom: 20px; }
      .badge-item { font-size: 12px; padding: 7px 12px; }
      
      .avatar-container { width: 190px; height: 190px; }
      .digital-card { width: 160px; padding: 16px; }
      .qr-box { width: 110px; height: 110px; }
      .digital-card h4 { font-size: 12px; margin-bottom: 10px; }
      .digital-card p { font-size: 11px; }
      
      .contact-grid { gap: 10px; max-width: 100%; }
      .contact-card { padding: 12px 14px; border-radius: 12px; }
      .contact-card strong { font-size: 13px; }
      .contact-card span { font-size: 11.5px; }
      
      .action-btns { flex-direction: column; gap: 10px; margin-bottom: 18px; }
      .btn { width: 100%; justify-content: center; padding: 12px 20px; font-size: 13.5px; }
      
      .social-row { gap: 8px; }
      .social-btn { width: 40px; height: 40px; font-size: 14px; }
      
      .section-stack { gap: 20px; margin-bottom: 28px; }
      .card { padding: 20px 16px; border-radius: 16px; }
      .card-title { font-size: 1.1rem; gap: 8px; }
      .about-tagline { font-size: 1.05rem; margin-bottom: 14px; }
      .about-text { font-size: 0.92rem; line-height: 1.7; margin-bottom: 14px; }
      .signature { font-size: 1.8rem; }
      
      .exp-grid { grid-template-columns: 1fr; gap: 10px; }
      .exp-item { padding: 16px 14px; flex-direction: row; text-align: left; gap: 14px; }
      .exp-item i { font-size: 22px; margin-bottom: 0; flex-shrink: 0; }
      .exp-item strong { font-size: 13.5px; }
      .exp-item span { font-size: 11.5px; }
      
      .tech-grid { grid-template-columns: repeat(3, 1fr); gap: 8px; }
      .tech-item { padding: 12px 6px; gap: 8px; border-radius: 10px; }
      .tech-item img { width: 24px; height: 24px; }
      .tech-item img[alt="Dahua"],
      .tech-item img[alt="Hikvision"],
      .tech-item img[alt="Uniview"] { width: 36px; height: 36px; }
      .tech-item i { font-size: 22px; height: 24px; }
      .tech-item span { font-size: 11px; }
      
      .stats { margin: 28px 0; }
      .stats-inner { grid-template-columns: 1fr; border-radius: 16px; }
      .stat {
        padding: 18px 16px;
        border-bottom: 1px solid var(--border);
      }
      .stat:last-child { border-bottom: none; }
      .stat-icon { width: 42px; height: 42px; font-size: 17px; border-radius: 12px; }
      .stat strong { font-size: 1.3rem; }
      .stat span { font-size: 13px; }
      
      .cert-item { padding: 14px; border-radius: 10px; }
      .cert-item span { font-size: 13.5px; line-height: 1.4; }
      .view-btn { font-size: 12.5px; padding: 6px 14px; }
      .view-all { font-size: 12px; padding: 4px 12px; }
      
      .cta-card { padding: 24px 18px; border-radius: 16px; gap: 22px; }
      .cta-left h3 { font-size: 1.2rem; }
      .cta-left p { font-size: 0.9rem; margin-bottom: 16px; }
      .cta-btn { padding: 11px 20px; font-size: 13.5px; }
      .cta-middle h4 { font-size: 1rem; margin-bottom: 14px; }
      .cta-social { width: 40px; height: 40px; font-size: 15px; }
      .cta-right .loc-title { font-size: 1rem; }
      .cta-right p { font-size: 0.9rem; }
      
      .bottom-nav {
        bottom: 14px;
        left: 50%;
        transform: translateX(-50%);
        width: calc(100% - 28px);
        max-width: 360px;
        padding: 8px 10px;
        gap: 2px;
        border-radius: 40px;
        justify-content: space-around;
      }
      .bottom-nav .nav-icon {
        width: 40px;
        height: 40px;
        font-size: 16px;
      }
      
      .fab-container { bottom: 90px; right: 14px; }
      .fab-main { width: 52px; height: 52px; font-size: 20px; }
      .fab-btn { padding: 10px 14px; font-size: 13px; }
      
      footer {
        margin-top: 36px;
        padding: 24px 0 16px;
        font-size: 12.5px;
        line-height: 1.5;
      }
    }
    
    /* Extra small phones */
    @media (max-width: 360px) {
      .main { padding: 16px 12px 105px; }
      .hero-left h1 { font-size: 1.85rem; }
      .typing { font-size: 0.98rem; }
      .avatar-container { width: 170px; height: 170px; }
      .tech-grid { grid-template-columns: repeat(2, 1fr); }
      .badge-item { font-size: 11.5px; padding: 6px 10px; }
      .bottom-nav { width: calc(100% - 20px); padding: 6px 8px; }
      .bottom-nav .nav-icon { width: 38px; height: 38px; font-size: 15px; }
    }