/* =======================
       Base / Reset
    ======================= */
    *, *::before, *::after { box-sizing: border-box; }
    * { margin: 0; padding: 0; }
    html { scroll-behavior: smooth; scroll-padding-top: 80px; }
    :root {
      --primary-color: #646cff;
      --secondary-color: #535bf2;
      --accent-color: #f7df1e;
      --text-dark: #1a1a1a;
      --text-light: #ffffff;
      --bg-dark: #0a0a0a;
      --bg-light: #ffffff;
      --bg-section: #f8f9fa;
      --border-color: #e0e0e0;
      --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
      --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.15);
    }
    /* Dark theme variables applied when data-theme="dark" on <html> */
    html[data-theme="dark"] {
      --text-dark: #eaeaea;
      --text-light: #ffffff;
      --bg-light: #0f1115;
      --bg-section: #12151b;
      --border-color: #262a33;
      --shadow: 0 4px 24px rgba(0,0,0,.45);
      --shadow-hover: 0 10px 36px rgba(0,0,0,.6);
    }
    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
      line-height: 1.6;
      color: var(--text-dark);
      background-color: var(--bg-light);
      overflow-x: hidden;
    }
    .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

    /* =======================
       Navbar
    ======================= */
    .navbar { position: fixed; inset: 0 0 auto 0; background-color: #fff; backdrop-filter: blur(10px); box-shadow: var(--shadow); z-index: 1000; transition: transform .3s ease, box-shadow .3s ease, background-color .3s ease; }
    .navbar .container { display: flex; justify-content: space-between; align-items: center; padding: 5px 24px; }
    .logo { color: var(--primary-color); cursor: pointer; }
    .nav-links { display: flex; list-style: none; gap: 32px; }
    .nav-links a { color: var(--text-dark); text-decoration: none; font-weight: 500; position: relative; padding: 6px 0; outline-offset: 6px; }
    .nav-links a::after { content: ""; position: absolute; left: 0; bottom: -5px; width: 0; height: 2px; background: var(--primary-color); transition: width .3s ease; }
    .nav-links a:hover::after, .nav-links a.is-active::after { width: 100%; }
    .menu-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
    .menu-toggle span { width: 25px; height: 3px; background: var(--text-dark); transition: transform .3s ease, opacity .2s ease; }
    .menu-toggle[aria-expanded="true"] span:nth-child(1){ transform: translateY(8px) rotate(45deg); }
    .menu-toggle[aria-expanded="true"] span:nth-child(2){ opacity: 0; }
    .menu-toggle[aria-expanded="true"] span:nth-child(3){ transform: translateY(-8px) rotate(-45deg); }
    .navbar--hidden {}
    .logo{
      max-width: 235px;
    }
    /* =======================
       Hero
    ======================= */
    .hero { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); position: relative; overflow: hidden; margin-top: 0; }
    .hero::before { content: ""; position: absolute; width: 200%; height: 200%; background: radial-gradient(circle, rgba(255,255,255,0.08) 1px, transparent 1px); background-size: 50px 50px; animation: moveBackground 20s linear infinite; }
    @keyframes moveBackground { from { transform: translate(0,0) } to { transform: translate(50px, 50px) } }
    .hero-content { text-align: center; color: var(--text-light); position: relative; z-index: 1; padding: 40px 24px; }
    .hero h1 { font-size: clamp(32px, 6vw, 64px); font-weight: 800; margin-bottom: 16px; line-height: 1.2; letter-spacing: .2px; }
    .hero p { font-size: clamp(16px, 2.5vw, 22px); margin-bottom: 28px; opacity: .95; }
    .cta-button { display: inline-block; padding: 14px 36px; background: var(--text-light); color: var(--primary-color); text-decoration: none; border-radius: 999px; font-weight: 700; font-size: 16px; transition: transform .2s ease, box-shadow .2s ease; box-shadow: 0 4px 16px rgba(0,0,0,.2); }
    .cta-button:hover { transform: translateY(-2px); box-shadow: 0 8px 22px rgba(0,0,0,.28); }

    section { padding: 96px 0; }
    .section-header { text-align: center; margin-bottom: 56px; }
    .section-header h2 { font-size: clamp(28px, 4vw, 40px); font-weight: 800; margin-bottom: 12px; }
    .section-header p { color: #666; }

    /* About */
    .about { background: var(--bg-light); }
    .about-content { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
    .about-text h3 { font-size: 28px; margin-bottom: 16px; color: var(--primary-color); }
    .about-text p { color: #555; margin-bottom: 12px; line-height: 1.8; }
    .about-stats { display: grid; grid-template-columns: 1fr; gap: 24px; }
    .stat-item { text-align: center; padding: 28px; background: linear-gradient(135deg, var(--primary-color), var(--secondary-color)); border-radius: 16px; color: var(--text-light); transition: transform .3s ease; }
    .stat-item:hover { transform: translateY(-4px); }
    .stat-item h3 { font-size: 40px; margin-bottom: 6px; }

    /* Services */
    .services { background: var(--bg-section); }
    .services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
    .service-card { background: var(--bg-light); padding: 40px 28px; border-radius: 16px; box-shadow: var(--shadow); transition: transform .25s ease, box-shadow .25s ease; text-align: center; }
    .service-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); }
    .service-icon { width: 72px; height: 72px; margin: 0 auto 18px; background: linear-gradient(135deg, var(--primary-color), var(--secondary-color)); border-radius: 50%; display: grid; place-items: center; color: var(--text-light); }
    .service-icon svg { width: 36px; height: 36px; }
    .service-card ul{ text-align:left; margin-top:12px; display:grid; gap:8px; }
    .service-card li{ list-style:none; position:relative; padding-left:18px; }
    .service-card li::before{ content:'•'; position:absolute; left:0; top:0; }

    /* Portfolio */
    .portfolio-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
    .portfolio-item { border-radius: 16px; overflow: hidden; box-shadow: var(--shadow); transition: transform .25s ease, box-shadow .25s ease; cursor: pointer; background: var(--bg-light); }
    .portfolio-item:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); }
    .portfolio-image { width: 100%; height: 300px; overflow: hidden; }
    .portfolio-image img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; display: block; }
    .portfolio-item:hover .portfolio-image img { transform: scale(1.06); }
    .portfolio-info { padding: 18px 20px 24px; }

    /* Team */
    .team { background: var(--bg-section); }
    .team-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }
    .team-member { text-align: center; transition: transform .25s ease; }
    .team-member:hover { transform: translateY(-8px); }
    .member-image { width: 200px; height: 200px; margin: 0 auto 18px; border-radius: 50%; overflow: hidden; border: 5px solid var(--primary-color); box-shadow: var(--shadow); }
    .member-image img { width: 100%; height: 100%; object-fit: cover; display: block; }

    /* Case Study */
    .case-study{ background: var(--bg-light); }
    .case-grid{ display:grid; grid-template-columns:1.3fr 1fr; gap:32px; align-items:center; }
    .case-media img{ width:100%; height:auto; display:block; border-radius:16px; box-shadow: var(--shadow); }
    .case-details h3{ margin-bottom:12px; color: var(--primary-color); }
    .ticks{ list-style:none; display:grid; gap:10px; margin:10px 0 16px; padding:0; }
    .ticks li{ position:relative; padding-left:24px; }
    .ticks li::before{ content:'✔'; position:absolute; left:0; top:0; }
    .metrics{ display:grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap:16px; margin-top:8px; }
    .metric{ background: var(--bg-section); border-radius:12px; padding:16px; text-align:center; box-shadow: var(--shadow); }
    .metric span{ font-weight:800; font-size:20px; display:block; }
    .metric small{ color:#666; }
    @media (max-width:968px){ .case-grid{ grid-template-columns:1fr; } }

    /* Contact */
    .contact { background: var(--bg-section); }
    .contact-content { display: grid; grid-template-columns: 1.5fr 1fr; gap: 48px; }
    .contact-form { display: flex; flex-direction: column; gap: 18px; }
    .form-group input, .form-group textarea { width: 100%; padding: 14px; border: 2px solid var(--border-color); border-radius: 10px; font: inherit; background: transparent; color: inherit; transition: border-color .2s ease, box-shadow .2s ease; }
    .form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--primary-color); box-shadow: 0 0 0 4px color-mix(in oklab, var(--primary-color) 20%, transparent); }
    .submit-button { padding: 14px 36px; background: linear-gradient(135deg, var(--primary-color), var(--secondary-color)); color: var(--text-light); border: none; border-radius: 12px; font-weight: 700; cursor: pointer; transition: transform .2s ease, box-shadow .2s ease; }
    .submit-button:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(100,108,255,.4); }
    .contact-info { display: flex; flex-direction: column; gap: 22px; }
    .info-item h3 { font-size: 18px; margin-bottom: 8px; color: var(--primary-color); }

    /* Footer */
    .footer { background: var(--bg-dark); color: var(--text-light); text-align: center; padding: 28px 0; }

    /* Animation helpers */
    .animate-on-scroll { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
    .animate-on-scroll.animated { opacity: 1; transform: translateY(0); }

    /* Back to top */
    .to-top { position: fixed; right: 20px; bottom: 20px; width: 44px; height: 44px; border-radius: 50%; border: none; background: var(--primary-color); color: var(--text-light); display: grid; place-items: center; box-shadow: var(--shadow); opacity: 0; visibility: hidden; transition: opacity .25s ease, transform .25s ease, visibility .25s; z-index: 900; }
    .to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }

    /* Theme toggle */
    .theme-toggle { margin-left: 12px; border: 2px solid var(--border-color); background: transparent; color: inherit; padding: 8px 12px; border-radius: 999px; cursor: pointer; font-weight: 600; }

    /* Mobile */
    @media (max-width: 968px) {
      .nav-links { position: fixed; left: -100%; top: 64px; right: 0; flex-direction: column; background: var(--bg-light); width: 100%; text-align: center; transition: left .3s ease; box-shadow: var(--shadow); padding: 24px 0; height: calc(100vh - 64px); overflow-y: auto; }
      .nav-links.active { left: 0; }
      .menu-toggle { display: flex; }
      .about-content { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .portfolio-grid { grid-template-columns: 1fr; }
      .team-grid { grid-template-columns: repeat(2, 1fr); }
      .clients-grid { grid-template-columns: repeat(2, 1fr); }
      .contact-content { grid-template-columns: 1fr; }
    }
    @media (max-width: 640px) {
      .team-grid, .clients-grid { grid-template-columns: 1fr; }
    }

    /* Accessibility helpers */
    :focus-visible { outline: 3px solid var(--accent-color); outline-offset: 3px; }
    @media (prefers-reduced-motion: reduce) {
      * { animation: none !important; transition: none !important; }
    }