:root {
      --dark: #1e1e1e;
      --gray: #3a3a3a;
      --silver: #b0b0b0;
      --light: #f9f9f9;
      --accent: #4a4a4a;
      --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --header-height: 80px;
      --header-height-scrolled: 68px;
    }
    * { margin:0; padding:0; box-sizing:border-box; }
    body {
      font-family: 'Montserrat', sans-serif;
      background: var(--light);
      color: var(--dark);
      line-height: 1.6;
      scroll-behavior: smooth;
      overflow-x: hidden;
    }
    header {
      position: fixed;
      top: 0; left: 0; right: 0;
      background: rgba(30,30,30,0.85);
      backdrop-filter: blur(12px);
      padding: 1.2rem 6%;
      display: flex;
      justify-content: space-between;
      align-items: center;
      z-index: 1000;
      border-bottom: 1px solid rgba(255,255,255,0.05);
      transition: var(--transition);
      height: var(--header-height);
    }
    header.scrolled {
      padding: 0.7rem 6%;
      background: rgba(30,30,30,0.96);
      height: var(--header-height-scrolled);
    }
    .logo img {
      height: 48px;
      width: auto;
      transition: var(--transition);
      filter: drop-shadow(0 2px 6px rgba(0,0,0,0.3));
    }
    nav {
      display: flex;
      align-items: center;
      gap: 1.8rem;
    }
    nav a {
      color: var(--silver);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.98rem;
      transition: var(--transition);
      position: relative;
      padding: 0.3rem 0;
    }
    nav a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: white;
      transition: width 0.25s ease;
    }
    nav a:hover::after { width: 100%; }
    nav a:hover { color: #fff; }
    .lang-switcher {
      display: flex;
      gap: 0.6rem;
      margin-left: 1.5rem;
    }
    .lang-switcher button {
      background: none;
      border: none;
      color: var(--silver);
      font-weight: 600;
      cursor: pointer;
      font-size: 0.95rem;
      padding: 0.3rem 0.6rem;
      border-radius: 4px;
      transition: var(--transition);
    }
    .lang-switcher button.active {
      color: white;
      background: rgba(255,255,255,0.15);
    }
    .lang-switcher button:hover { color: white; }
    .btn {
      background: var(--accent);
      color: white;
      padding: 0.7rem 2rem;
      border-radius: 40px;
      text-decoration: none;
      font-weight: 600;
      transition: var(--transition);
      border: 1px solid transparent;
      white-space: nowrap;
    }
    .btn:hover {
      background: #5c5c5c;
      transform: scale(1.03);
      border-color: #fff;
    }
    .hero {
      min-height: 100vh;
      background: radial-gradient(ellipse at 70% 30%, #2a2a2a, #111);
      color: white;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      padding: calc(var(--header-height) + 2rem) 6% 5rem;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      width: 100%;
      height: 100%;
      background: repeating-linear-gradient(45deg, rgba(255,255,255,0.01) 0px, rgba(255,255,255,0.01) 2px, transparent 2px, transparent 10px);
      pointer-events: none;
    }
    .hero-content { position: relative; z-index: 2; max-width: 1000px; }
    .hero h1 {
      font-size: clamp(2.5rem, 8vw, 5rem);
      font-weight: 800;
      margin-bottom: 1.5rem;
      letter-spacing: -1px;
      line-height: 1.2;
      background: linear-gradient(to right, #fff 60%, #ccc);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero p { font-size: clamp(1.1rem, 3vw, 1.4rem); max-width: 720px; margin: 0 auto 2.5rem; opacity: 0.9; }
    .hero .btn {
      background: white;
      color: var(--dark);
      font-size: clamp(1rem, 4vw, 1.2rem);
      padding: 0.9rem 2.2rem;
      box-shadow: 0 8px 20px rgba(0,0,0,0.3);
    }
    .hero .btn:hover {
      background: var(--silver);
      color: #000;
      transform: translateY(-3px);
    }
    .slogan {
      font-size: clamp(1rem, 3.5vw, 1.3rem);
      font-style: italic;
      opacity: 0.7;
      margin-top: 3.5rem;
      border-left: 4px solid var(--silver);
      padding-left: 1.5rem;
      display: inline-block;
    }
    section { padding: 5rem 6%; max-width: 1400px; margin: 0 auto; scroll-margin-top: calc(var(--header-height) + 1rem); }
    h2 {
      font-size: clamp(2.2rem, 6vw, 3rem);
      font-weight: 700;
      color: var(--gray);
      text-align: center;
      margin-bottom: 3rem;
      position: relative;
    }
    h2::after {
      content: '';
      display: block;
      width: 70px;
      height: 4px;
      background: var(--accent);
      margin: 0.8rem auto 0;
      border-radius: 4px;
    }
    .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 2rem; }
    .card {
      background: white;
      padding: 2.5rem 1.5rem;
      border-radius: 28px;
      box-shadow: 0 15px 35px rgba(0,0,0,0.04);
      text-align: center;
      transition: var(--transition);
      border: 1px solid rgba(0,0,0,0.02);
    }
    .card:hover {
      transform: translateY(-8px);
      box-shadow: 0 30px 50px rgba(0,0,0,0.1);
      border-color: var(--silver);
    }
    .card i { font-size: 3rem; color: var(--accent); margin-bottom: 1.2rem; transition: var(--transition); }
    .card:hover i { transform: scale(1.1); color: var(--gray); }
    .card h3 { color: var(--gray); font-size: 1.4rem; margin-bottom: 0.8rem; font-weight: 600; }
    .card p { font-size: 0.95rem; padding: 0 0.3rem; }
    .about-text {
      font-size: clamp(1rem, 3vw, 1.25rem);
      max-width: 820px;
      margin: 0 auto;
      text-align: center;
      color: #444;
      line-height: 1.7;
    }
    .address-block {
      text-align: center;
      margin-top: 2.5rem;
      padding: 1.5rem 1rem;
      background: #f0f0f0;
      border-radius: 40px;
      color: var(--gray);
      font-weight: 500;
      font-size: 0.95rem;
    }
    /* certificate section styles */
    .certificate-container {
      max-width: 960px;
      margin: 2rem auto 0;
      background: white;
      border-radius: 36px;
      padding: 2rem 2rem 2rem;
      box-shadow: 0 20px 40px rgba(0,0,0,0.05);
      text-align: center;
      transition: var(--transition);
    }
    .certificate-badge {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      background: #f1f1f1;
      padding: 0.6rem 1.5rem;
      border-radius: 60px;
      margin-bottom: 1.8rem;
    }
    .certificate-badge i {
      font-size: 1.8rem;
      color: var(--accent);
    }
    .certificate-badge span {
      font-weight: 600;
      color: var(--gray);
      letter-spacing: 0.5px;
    }
    .certificate-image-wrapper {
      background: #fefefe;
      border-radius: 28px;
      padding: 1rem;
      box-shadow: 0 12px 28px rgba(0,0,0,0.08);
      display: inline-block;
      max-width: 100%;
      transition: transform 0.2s ease;
    }
    .certificate-image-wrapper:hover {
      transform: scale(1.01);
    }
    .certificate-image-wrapper img {
      max-width: 100%;
      height: auto;
      border-radius: 20px;
      display: block;
      margin: 0 auto;
      box-shadow: 0 8px 20px rgba(0,0,0,0.1);
    }
    .certificate-caption {
      margin-top: 1.5rem;
      font-weight: 500;
      color: var(--accent);
      font-size: 0.95rem;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      flex-wrap: wrap;
    }
    .certificate-caption i {
      font-size: 1rem;
      color: #2e7d32;
    }
    .certificate-desc {
      max-width: 720px;
      margin: 1.5rem auto 0;
      color: #4b4b4b;
      font-size: 1rem;
      line-height: 1.6;
    }
    .contact-form {
      max-width: 720px;
      margin: 0 auto;
      background: white;
      padding: 2.5rem 1.8rem;
      border-radius: 36px;
      box-shadow: 0 30px 60px rgba(0,0,0,0.08);
    }
    .input-field {
      width: 100%;
      padding: 1.1rem 1.5rem;
      margin-bottom: 1rem;
      border: 1.5px solid #eee;
      border-radius: 50px;
      font-size: 1rem;
      background: #fcfcfc;
    }
    textarea.input-field { border-radius: 30px; resize: vertical; }
    .input-field:focus {
      outline: none;
      border-color: var(--gray);
      background: white;
      box-shadow: 0 8px 18px rgba(0,0,0,0.02);
    }
    .submit-btn {
      background: var(--dark);
      color: white;
      border: none;
      padding: 1.2rem 2rem;
      font-size: 1.1rem;
      border-radius: 50px;
      cursor: pointer;
      font-weight: 600;
      width: 100%;
      margin-top: 0.5rem;
    }
    .submit-btn:hover { background: #000; transform: translateY(-3px); box-shadow: 0 20px 30px -8px rgba(0,0,0,0.3); }
    .contact-details {
      display: flex;
      justify-content: center;
      gap: 1.5rem;
      margin-top: 2rem;
      font-size: 1rem;
      color: var(--gray);
      flex-wrap: wrap;
    }
    footer {
      background: var(--dark);
      color: #777;
      text-align: center;
      padding: 3.5rem 6% 2.5rem;
      border-top: 1px solid #2a2a2a;
    }
    .footer-logo img { height: 52px; opacity: 0.8; transition: var(--transition); }
    .footer-logo img:hover { opacity: 1; transform: scale(1.02); }
    .footer-links { display: flex; gap: 1.8rem; justify-content: center; margin: 1.8rem 0 1.5rem; flex-wrap: wrap; }
    .footer-links a { color: var(--silver); text-decoration: none; font-weight: 500; font-size: 0.95rem; }
    .footer-links a:hover { color: white; }
    hr { border: none; height: 1px; background: #333; max-width: 500px; margin: 1.8rem auto; }

    /* Mobile */
    @media (max-width: 768px) {
      nav { display: none; }
      .lang-switcher { margin-left: 1rem; }
      header .btn, #mobileQuoteBtn { display: inline-block; margin-left: auto; padding: 0.5rem 1.2rem; font-size: 0.9rem; }
      .hero h1 { font-size: 2.4rem; }
      .hero p { font-size: 1.1rem; }
      section { padding: 3rem 5%; }
      .certificate-container { padding: 1.5rem; }
      .certificate-badge span { font-size: 0.9rem; }
    }