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

    :root {
      --bg-primary: #0a0a0a;
      --bg-secondary: #111111;
      --bg-card: #1a1a1a;
      --text-primary: #ffffff;
      --text-secondary: #a0a0a0;
      --accent-blue: #2563eb;
      --accent-green: #16a34a;
      --accent-amber: #f59e0b;
      --accent-purple: #7c3aed;
    }

    html {
      scroll-behavior: smooth;
    }

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

    /* scrollbar */
    ::-webkit-scrollbar {
      width: 8px;
    }
    ::-webkit-scrollbar-track {
      background: var(--bg-primary);
    }
    ::-webkit-scrollbar-thumb {
      background: #333;
      border-radius: 4px;
    }
    ::-webkit-scrollbar-thumb:hover {
      background: #555;
    }

    /* navigation */
    nav {
      position: fixed;
      top: 0;
      width: 100%;
      padding: 1.5rem 5%;
      display: flex;
      justify-content: space-between;
      align-items: center;
      z-index: 1000;
      background: rgba(10, 10, 10, 0.8);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.05);
      transition: all 0.3s ease;
    }

    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--text-primary);
      text-decoration: none;
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      gap: 2.5rem;
      list-style: none;
    }

    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.3s ease;
      position: relative;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -5px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-blue);
      transition: width 0.3s ease;
    }

    .nav-links a:hover {
      color: var(--text-primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      color: var(--text-primary);
      font-size: 1.5rem;
      cursor: pointer;
    }

    /* hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding: 0 5%;
      padding-top: 80px;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: -50%;
      right: -20%;
      width: 800px;
      height: 800px;
      background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }

    .hero-container {
      max-width: 1400px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 4rem;
      align-items: center;
      width: 100%;
    }

    .hero-content {
      animation: fadeInLeft 1s ease;
    }

    .profile-img-container {
      width: 100px;
      height: 100px;
      border-radius: 50%;
      overflow: hidden;
      border: 3px solid rgba(255,255,255,0.1);
      margin-bottom: 2rem;
      position: relative;
    }
    .profile-img-container img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .hero-title {
      font-size: clamp(2.5rem, 5vw, 4.5rem);
      font-weight: 800;
      line-height: 1.1;
      margin-bottom: 1rem;
      letter-spacing: -2px;
    }

    .hero-subtitle {
      font-size: clamp(1.2rem, 2vw, 1.8rem);
      color: var(--text-secondary);
      font-weight: 500;
      margin-bottom: 1.5rem;
    }

    .hero-description {
      font-size: 1.1rem;
      color: var(--text-primary);
      margin-bottom: 0.5rem;
      font-weight: 600;
    }

    .hero-text {
      color: var(--text-secondary);
      font-size: 1rem;
      margin-bottom: 2.5rem;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .btn {
      padding: 0.9rem 1.8rem;
      border-radius: 8px;
      font-weight: 600;
      font-size: 0.95rem;
      text-decoration: none;
      transition: all 0.3s ease;
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
    }

    .btn-blue {
      background: var(--accent-blue);
      color: white;
    }
    .btn-blue:hover {
      background: #1d4ed8;
      transform: translateY(-2px);
      box-shadow: 0 10px 30px rgba(37, 99, 235, 0.3);
    }

    .btn-green {
      background: var(--accent-green);
      color: white;
    }
    .btn-green:hover {
      background: #15803d;
      transform: translateY(-2px);
      box-shadow: 0 10px 30px rgba(22, 163, 74, 0.3);
    }

    .btn-amber {
      background: var(--accent-amber);
      color: #0a0a0a;
    }
    .btn-amber:hover {
      background: #d97706;
      transform: translateY(-2px);
      box-shadow: 0 10px 30px rgba(245, 158, 11, 0.3);
    }

    /* laptop mockup */
    .hero-visual {
      display: flex;
      justify-content: center;
      align-items: center;
      animation: fadeInRight 1s ease;
      position: relative;
    }

    .laptop-container {
      position: relative;
      width: 100%;
      max-width: 700px;
      perspective: 1500px;
    }

    .laptop {
      position: relative;
      transform-style: preserve-3d;
      animation: float 6s ease-in-out infinite;
    }

    .laptop-screen {
      background: #1a1a1a;
      border-radius: 16px 16px 0 0;
      padding: 12px 12px 0 12px;
      border: 2px solid #333;
      border-bottom: none;
      position: relative;
      box-shadow: 0 0 40px rgba(255,255,255,0.05);
    }

    .laptop-notch {
      position: absolute;
      top: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 80px;
      height: 12px;
      background: #1a1a1a;
      border-radius: 0 0 8px 8px;
      z-index: 10;
    }

    .laptop-display {
      background: #ffffff;
      border-radius: 8px 8px 0 0;
      aspect-ratio: 16/10;
      overflow: hidden;
      position: relative;
    }

    .mockup-content {
      padding: 2rem;
      height: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      text-align: center;
      color: #0a0a0a;
    }

    .mockup-nav {
      position: absolute;
      top: 1rem;
      left: 0;
      right: 0;
      display: flex;
      justify-content: center;
      gap: 1rem;
      font-size: 0.6rem;
      font-weight: 600;
    }
    .mockup-nav span {
      background: #0a0a0a;
      color: white;
      padding: 2px 8px;
      border-radius: 10px;
    }

    .mockup-title {
      font-size: 2.5rem;
      font-weight: 800;
      line-height: 1;
      margin-top: 1rem;
      letter-spacing: -1px;
    }

    .mockup-subtitle {
      font-size: 0.7rem;
      color: #666;
      margin-top: 1rem;
      max-width: 60%;
    }

    .mockup-contact {
      position: absolute;
      bottom: 1.5rem;
      left: 2rem;
      text-align: left;
      font-size: 0.6rem;
    }
    .mockup-contact strong {
      display: block;
      font-size: 0.7rem;
      margin-bottom: 0.2rem;
    }

    .laptop-base {
      background: linear-gradient(to bottom, #c0c0c0, #a0a0a0);
      height: 24px;
      border-radius: 0 0 12px 12px;
      position: relative;
      box-shadow: 0 20px 60px rgba(0,0,0,0.5);
    }
    .laptop-base::before {
      content: '';
      position: absolute;
      top: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 80px;
      height: 6px;
      background: #888;
      border-radius: 0 0 4px 4px;
    }

    .laptop-shadow {
      position: absolute;
      bottom: -30px;
      left: 10%;
      right: 10%;
      height: 20px;
      background: radial-gradient(ellipse, rgba(0,0,0,0.4) 0%, transparent 70%);
      border-radius: 50%;
    }

    /* sections */
    section {
      padding: 6rem 5%;
    }

    .section-header {
      text-align: center;
      margin-bottom: 4rem;
    }

    .section-tag {
      color: var(--accent-blue);
      font-weight: 600;
      font-size: 0.9rem;
      text-transform: uppercase;
      letter-spacing: 2px;
      margin-bottom: 1rem;
      display: block;
    }

    .section-title {
      font-size: clamp(2rem, 4vw, 3rem);
      font-weight: 800;
      margin-bottom: 1rem;
    }

    .section-desc {
      color: var(--text-secondary);
      max-width: 600px;
      margin: 0 auto;
    }

    /* about */
    .about {
      background: var(--bg-secondary);
    }

    .about-grid {
      max-width: 1200px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 4rem;
      align-items: center;
    }

    .about-image {
      position: relative;
    }
    .about-image img {
      width: 100%;
      border-radius: 16px;
      box-shadow: 0 20px 60px rgba(0,0,0,0.5);
    }

    .about-stats {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 1.5rem;
      margin-top: 2rem;
    }

    .stat-card {
      background: var(--bg-card);
      padding: 1.5rem;
      border-radius: 12px;
      border: 1px solid rgba(255,255,255,0.05);
    }

    .stat-number {
      font-size: 2rem;
      font-weight: 800;
      color: var(--accent-blue);
    }

    .stat-label {
      color: var(--text-secondary);
      font-size: 0.9rem;
      margin-top: 0.25rem;
    }

    .skills-list {
      display: flex;
      flex-wrap: wrap;
      gap: 0.75rem;
      margin-top: 1.5rem;
    }

    .skill-tag {
      background: var(--bg-card);
      border: 1px solid rgba(255,255,255,0.1);
      padding: 0.5rem 1rem;
      border-radius: 100px;
      font-size: 0.85rem;
      color: var(--text-secondary);
      transition: all 0.3s ease;
    }
    .skill-tag:hover {
      border-color: var(--accent-blue);
      color: var(--text-primary);
      transform: translateY(-2px);
    }

    /* projects */
    .projects-grid {
      max-width: 1200px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
      gap: 2rem;
    }

    .project-card {
      background: var(--bg-card);
      border-radius: 16px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.05);
      transition: all 0.4s ease;
      position: relative;
    }
    .project-card:hover {
      transform: translateY(-8px);
      border-color: rgba(255,255,255,0.1);
      box-shadow: 0 20px 60px rgba(0,0,0,0.4);
    }

    .project-image {
      width: 100%;
      height: 220px;
      background: linear-gradient(135deg, #1a1a2e, #16213e);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 3rem;
      color: var(--accent-blue);
      position: relative;
      overflow: hidden;
    }
    .project-image::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, transparent, rgba(37, 99, 235, 0.1));
    }

    .project-content {
      padding: 1.5rem;
    }

    .project-tags {
      display: flex;
      gap: 0.5rem;
      margin-bottom: 0.75rem;
    }

    .project-tag {
      font-size: 0.75rem;
      padding: 0.25rem 0.75rem;
      background: rgba(37, 99, 235, 0.15);
      color: var(--accent-blue);
      border-radius: 100px;
      font-weight: 500;
    }

    .project-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 0.5rem;
    }

    .project-desc {
      color: var(--text-secondary);
      font-size: 0.9rem;
      margin-bottom: 1rem;
    }

    .project-links {
      display: flex;
      gap: 1rem;
    }

    .project-link {
      color: var(--text-secondary);
      text-decoration: none;
      font-size: 0.9rem;
      font-weight: 500;
      display: flex;
      align-items: center;
      gap: 0.4rem;
      transition: color 0.3s ease;
    }
    .project-link:hover {
      color: var(--accent-blue);
    }

    /* contact — WhatsApp only */
    .contact {
      background: var(--bg-secondary);
    }

    .contact-container {
      max-width: 800px;
      margin: 0 auto;
    }

    .contact-card {
      background: var(--bg-card);
      padding: 3rem 2.5rem;
      border-radius: 24px;
      border: 1px solid rgba(255,255,255,0.06);
      text-align: center;
      transition: 0.3s;
    }

    .contact-card i {
      font-size: 4rem;
      color: #25D366;
      margin-bottom: 1.5rem;
      display: inline-block;
    }

    .contact-card h3 {
      font-size: 1.8rem;
      font-weight: 700;
      margin-bottom: 1rem;
    }

    .contact-card p {
      color: var(--text-secondary);
      max-width: 420px;
      margin: 0 auto 2rem;
      font-size: 1.05rem;
    }

    .btn-whatsapp {
      background: #25D366;
      color: white;
      padding: 1rem 2.8rem;
      border-radius: 60px;
      font-weight: 600;
      font-size: 1.2rem;
      display: inline-flex;
      align-items: center;
      gap: 0.75rem;
      text-decoration: none;
      transition: 0.3s;
      border: none;
      cursor: pointer;
    }
    .btn-whatsapp:hover {
      background: #128C7E;
      transform: scale(1.03);
      box-shadow: 0 12px 30px rgba(37, 211, 102, 0.3);
    }

    .contact-socials {
      display: flex;
      justify-content: center;
      gap: 1.5rem;
      margin-top: 3rem;
    }

    .social-link {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--bg-card);
      border: 1px solid rgba(255,255,255,0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-secondary);
      font-size: 1.25rem;
      text-decoration: none;
      transition: all 0.3s ease;
    }
    .social-link:hover {
      background: var(--accent-blue);
      color: white;
      border-color: var(--accent-blue);
      transform: translateY(-4px);
    }

    /* footer */
    footer {
      background: var(--bg-primary);
      border-top: 1px solid rgba(255,255,255,0.05);
      padding: 2rem 5%;
      text-align: center;
      color: var(--text-secondary);
      font-size: 0.9rem;
    }

    /* animations */
    @keyframes fadeInLeft {
      from { opacity: 0; transform: translateX(-50px); }
      to { opacity: 1; transform: translateX(0); }
    }
    @keyframes fadeInRight {
      from { opacity: 0; transform: translateX(50px); }
      to { opacity: 1; transform: translateX(0); }
    }
    @keyframes float {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-15px); }
    }

    .reveal {
      opacity: 0;
      transform: translateY(30px);
      transition: all 0.8s ease;
    }
    .reveal.active {
      opacity: 1;
      transform: translateY(0);
    }

    /* responsive */
    @media (max-width: 1024px) {
      .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-content { order: 2; }
      .hero-visual { order: 1; }
      .profile-img-container { margin: 0 auto 2rem; }
      .hero-text { margin: 0 auto 2.5rem; }
      .hero-buttons { justify-content: center; }
      .about-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        border-bottom: 1px solid rgba(255,255,255,0.05);
      }
      .nav-links.active { display: flex; }
      .mobile-menu-btn { display: block; }
      .projects-grid { grid-template-columns: 1fr; }
      .contact-card { padding: 2rem 1.5rem; }
      .hero-buttons { flex-direction: column; align-items: center; }
      .btn { width: 100%; max-width: 250px; justify-content: center; }
    }