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

    /* Light theme (default) */
    :root {
      --bg-body: #ffffff;
      --bg-surface: #ffffff;
      --bg-card: #ffffff;
      --bg-team: #fefaf5;
      --bg-testimonial: #fefaf5;
      --bg-contact: #f7f9fc;
      --text-primary: #111827;
      --text-secondary: #374151;
      --text-muted: #4b5563;
      --border-light: #f0e9e3;
      --border-card: #ede6df;
      --accent: #c2410c;
      --accent-hover: #9a3412;
      --accent-glow: rgba(194, 65, 12, 0.15);
      --header-bg: rgba(255, 255, 255, 0.96);
      --shadow-sm: 0 8px 20px rgba(0,0,0,0.02);
      --shadow-md: 0 12px 28px rgba(0,0,0,0.05);
      --footer-bg: #0f172a;
      --footer-text: #cbd5e1;
      --overlay-dark: rgba(0,0,0,0.4);
    }

    /* Dark theme */
    body.dark {
      --bg-body: #0a0c12;
      --bg-surface: #12141c;
      --bg-card: #171a24;
      --bg-team: #0e1017;
      --bg-testimonial: #0e1017;
      --bg-contact: #0f121b;
      --text-primary: #f3f4f6;
      --text-secondary: #e5e7eb;
      --text-muted: #9ca3af;
      --border-light: #262b38;
      --border-card: #262b38;
      --accent: #f97316;
      --accent-hover: #fdba74;
      --accent-glow: rgba(249, 115, 22, 0.2);
      --header-bg: rgba(10, 12, 22, 0.95);
      --shadow-sm: 0 8px 20px rgba(0,0,0,0.4);
      --shadow-md: 0 14px 32px rgba(0,0,0,0.5);
      --footer-bg: #03060c;
      --footer-text: #9ca3af;
      --overlay-dark: rgba(0,0,0,0.55);
    }

    body {
      font-family: 'Inter', sans-serif;
      background: var(--bg-body);
      color: var(--text-primary);
      scroll-behavior: smooth;
      line-height: 1.5;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* header */
    header {
      position: fixed;
      width: 100%;
      top: 0;
      z-index: 1000;
      background: var(--header-bg);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      transition: all 0.25s;
    }

    nav {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 0.9rem 0;
      flex-wrap: wrap;
      gap: 1rem;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      background: linear-gradient(135deg, var(--accent), #fbbf24);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
      letter-spacing: -0.02em;
    }

    .nav-links {
      display: flex;
      gap: 1.8rem;
      list-style: none;
      align-items: center;
      flex-wrap: wrap;
    }

    .nav-links a {
      text-decoration: none;
      font-weight: 500;
      color: var(--text-primary);
      transition: 0.2s;
      font-size: 0.95rem;
    }

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

    .theme-toggle {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: 40px;
      padding: 0.4rem 1rem;
      cursor: pointer;
      font-size: 0.9rem;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-primary);
    }

    .btn-outline-light {
      background: transparent;
      border: 1.5px solid var(--accent);
      padding: 0.45rem 1.2rem;
      border-radius: 40px;
      color: var(--accent);
      font-weight: 600;
      transition: 0.2s;
    }

    .btn-outline-light:hover {
      background: var(--accent);
      color: white;
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 0.9rem 2rem;
      border-radius: 40px;
      text-decoration: none;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: 0.25s;
      border: none;
      cursor: pointer;
      box-shadow: 0 8px 20px var(--accent-glow);
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-3px);
      box-shadow: 0 12px 26px var(--accent-glow);
    }

    /* HERO SLIDER - FULL SCREEN */
    .hero {
      position: relative;
      height: 100vh;
      min-height: 600px;
      overflow: hidden;
    }

    .slider-container {
      position: relative;
      width: 100%;
      height: 100%;
    }

    .slide {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      opacity: 0;
      transition: opacity 1s ease-in-out;
      z-index: 1;
    }

    .slide.active {
      opacity: 1;
      z-index: 2;
    }

    .slide img {
      width: 100%;
      height: 100%;
      object-fit: fill;
      object-position: center;
    }

    .slide::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: var(--overlay-dark);
      pointer-events: none;
    }

    /* Hero content overlay */
    .hero-content {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      z-index: 10;
      text-align: left;
      width: 100%;
      max-width: 1280px;
      padding: 0 1.5rem;
      color: white;
      text-shadow: 0 2px 20px rgba(0,0,0,0.3);
    }

    .hero-content h1 {
      font-size: 4rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 1.2rem;
      letter-spacing: -0.02em;
      max-width: 700px;
    }

    .hero-content p {
      font-size: 1.2rem;
      margin-bottom: 2rem;
      opacity: 0.95;
      max-width: 550px;
    }

    .hero-stats {
      display: flex;
      gap: 2.5rem;
      margin-top: 2rem;
      flex-wrap: wrap;
    }

    .stat-item h3 {
      font-size: 2rem;
      font-weight: 800;
      color: var(--accent);
      text-shadow: 0 0 10px rgba(0,0,0,0.2);
    }

    .stat-item p {
      color: rgba(255,255,255,0.85);
      margin-top: 0.25rem;
    }

    /* Slider Navigation Arrows */
    .slider-arrow {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      width: 50px;
      height: 50px;
      background: rgba(255,255,255,0.2);
      backdrop-filter: blur(8px);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      z-index: 15;
      transition: all 0.3s;
      border: 1px solid rgba(255,255,255,0.3);
      color: white;
      font-size: 1.5rem;
    }

    .slider-arrow:hover {
      background: var(--accent);
      border-color: var(--accent);
    }

    .slider-arrow.prev {
      left: 30px;
    }

    .slider-arrow.next {
      right: 30px;
    }

    /* Slider Dots */
    .slider-dots {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      gap: 12px;
      z-index: 15;
    }

    .dot {
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background: rgba(255,255,255,0.5);
      cursor: pointer;
      transition: all 0.3s;
    }

    .dot.active {
      background: var(--accent);
      width: 28px;
      border-radius: 20px;
    }

    .dot:hover {
      background: var(--accent);
    }

    /* Scroll indicator */
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 15;
      color: white;
      text-align: center;
      animation: bounce 2s infinite;
      cursor: pointer;
      background: rgba(0,0,0,0.3);
      width: 40px;
      height: 40px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      backdrop-filter: blur(4px);
    }

    @keyframes bounce {
      0%, 100% { transform: translateX(-50%) translateY(0); }
      50% { transform: translateX(-50%) translateY(10px); }
    }

    /* section titles */
    section {
      padding: 5rem 0;
    }

    .section-title {
      font-size: 2.4rem;
      font-weight: 800;
      margin-bottom: 1rem;
      letter-spacing: -0.01em;
      text-align: center;
      background: linear-gradient(to right, var(--accent), #f5b042);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }

    .section-sub {
      text-align: center;
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto 3rem auto;
      font-size: 1.05rem;
    }

    /* cards */
    .services-grid,
    .team-grid,
    .projects-grid,
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 2rem;
    }

    .service-card,
    .team-card,
    .project-item,
    .testimonial-card {
      background: var(--bg-card);
      border-radius: 32px;
      padding: 2rem 1.8rem;
      transition: all 0.3s;
      border: 1px solid var(--border-card);
      box-shadow: var(--shadow-sm);
    }

    .service-card:hover,
    .team-card:hover,
    .project-item:hover {
      transform: translateY(-8px);
      border-color: var(--accent);
      box-shadow: var(--shadow-md);
    }

    .service-icon {
      font-size: 2.6rem;
      color: var(--accent);
      margin-bottom: 1.2rem;
    }

    .team-card {
      text-align: center;
      padding: 1.8rem;
    }

    .team-card img {
      width: 120px;
      height: 120px;
      border-radius: 50%;
      object-fit: cover;
      margin-bottom: 1rem;
      border: 3px solid var(--accent);
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    }

    .team-card h4 {
      font-size: 1.3rem;
      font-weight: 700;
    }

    .team-card .role {
      color: var(--accent);
      font-weight: 600;
      margin: 0.25rem 0 0.8rem;
    }

    .project-img {
      height: 240px;
      background-size: cover;
      background-position: center;
      border-radius: 24px 24px 0 0;
    }

    .project-info {
      padding: 1.5rem;
    }

    .testimonial-card {
      border-left: 5px solid var(--accent);
      font-style: normal;
    }

    .testimonial-card i {
      color: var(--accent);
      font-size: 1.8rem;
      opacity: 0.7;
      margin-bottom: 0.8rem;
    }

    /* Contact */
    .contact-wrapper {
      display: flex;
      flex-wrap: wrap;
      gap: 3rem;
      background: var(--bg-contact);
      border-radius: 48px;
      padding: 2.5rem;
      border: 1px solid var(--border-light);
    }

    .contact-info {
      flex: 1;
    }

    .contact-info p {
      margin: 1rem 0;
      display: flex;
      align-items: center;
      gap: 1rem;
    }

    .contact-info i {
      width: 32px;
      color: var(--accent);
      font-size: 1.3rem;
    }

    .contact-form {
      flex: 1.2;
    }

    .input-group {
      margin-bottom: 1.2rem;
    }

    .input-group input,
    .input-group textarea {
      width: 100%;
      padding: 14px 18px;
      border: 1px solid var(--border-light);
      border-radius: 48px;
      font-family: inherit;
      background: var(--bg-surface);
      color: var(--text-primary);
      outline: none;
      transition: 0.2s;
    }

    .input-group input:focus,
    .input-group textarea:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px var(--accent-glow);
    }

    .input-group textarea {
      border-radius: 28px;
      resize: vertical;
    }

    .footer {
      background: var(--footer-bg);
      color: var(--footer-text);
      padding: 0.5rem 2rem;
      text-align: center;
    }

    .toast-msg {
      position: fixed;
      bottom: 30px;
      right: 30px;
      background: var(--accent);
      color: white;
      padding: 12px 24px;
      border-radius: 50px;
      font-weight: 500;
      z-index: 1100;
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
      opacity: 0;
      transition: opacity 0.3s;
      pointer-events: none;
    }

    /* Responsive */
    @media (max-width: 860px) {
      .hero-content h1 {
        font-size: 2.5rem;
      }
      .hero-content p {
        font-size: 1rem;
      }
      .hero-stats {
        gap: 1.5rem;
      }
      nav {
        flex-direction: column;
        align-items: center;
      }
      .nav-links {
        justify-content: center;
        gap: 1rem;
        row-gap: 0.8rem;
      }
      .section-title {
        font-size: 2rem;
      }
      .contact-wrapper {
        padding: 1.5rem;
      }
      .slider-arrow {
        width: 40px;
        height: 40px;
        font-size: 1rem;
      }
      .slider-arrow.prev {
        left: 15px;
      }
      .slider-arrow.next {
        right: 15px;
      }
    }

    @media (max-width: 580px) {
      .container {
        padding: 0 1.2rem;
      }
      .hero-content h1 {
        font-size: 1.8rem;
      }
      .stat-item h3 {
        font-size: 1.4rem;
      }
      .btn-primary {
        padding: 0.7rem 1.5rem;
      }
      .hero-stats {
        gap: 1rem;
      }
    }

    button,
    a {
      cursor: pointer;
    }

    .social-icons i {
      transition: 0.2s;
      cursor: pointer;
    }

    .social-icons i:hover {
      color: var(--accent);
      transform: scale(1.1);
    }

    /* Floating WhatsApp Button */
.whatsapp-float {
    position: fixed;
    bottom: 30px;
    left: 30px;
    background: #25D366;
    color: white;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    box-shadow: 0 4px 15px rgba(37, 211, 102, 0.3);
    transition: all 0.3s ease;
    z-index: 100;
    text-decoration: none;
}

.whatsapp-float:hover {
    transform: scale(1.1);
    background: #20b859;
    color: white;
}

.whatsapp-tooltip {
    position: absolute;
    right: 70px;
    background: var(--bg-card);
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}

.whatsapp-float:hover .whatsapp-tooltip {
    opacity: 1;
    visibility: visible;
    right: 75px;
}

@media (max-width: 580px) {
    .whatsapp-float {
        width: 50px;
        height: 50px;
        font-size: 1.6rem;
        bottom: 20px;
        left: 20px;
    }
}