:root {
      --primary: #1f6feb;
      --bg: #f5f7fb;
      --card-bg: #ffffff;
      --text: #111827;
      --muted: #6b7280;
      --border: #e5e7eb;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      background: var(--bg);
      color: var(--text);
      line-height: 1.7;
    }

    header {
      background: linear-gradient(135deg, #0f172a, #1f6feb);
      color: #fff;
      padding: 16px 24px;
      position: sticky;
      top: 0;
      z-index: 10;
    }

    .nav-inner {
      max-width: 720px;
      margin: 0 auto;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .logo {
      font-weight: 700;
      font-size: 1.1rem;
      letter-spacing: 0.03em;
      text-transform: uppercase;
    }

    nav a {
      color: #e5e7eb;
      text-decoration: none;
      margin-left: 16px;
      font-size: 0.95rem;
    }

    nav a:hover {
      color: #ffffff;
    }

    nav a.primary-link {
      padding: 6px 14px;
      border-radius: 999px;
      border: 1px solid rgba(255, 255, 255, 0.3);
    }

    main {
      max-width: 720px;
      margin: 24px auto 40px;
      padding: 0 16px;
    }

    h1 {
      margin-bottom: 6px;
      font-size: 1.7rem;
    }

    .subtitle {
      margin-top: 0;
      margin-bottom: 20px;
      color: var(--muted);
      font-size: 0.95rem;
    }

    .card {
      background: var(--card-bg);
      border-radius: 18px;
      border: 1px solid var(--border);
      padding: 18px 18px 16px;
      box-shadow: 0 10px 26px rgba(15, 23, 42, 0.06);
      margin-bottom: 20px;
    }

    label {
      display: block;
      font-size: 0.9rem;
      margin-bottom: 4px;
      font-weight: 500;
    }

    input,
    textarea {
      width: 100%;
      padding: 9px 10px;
      font-size: 0.92rem;
      border-radius: 10px;
      border: 1px solid var(--border);
      background: #f9fafb;
      margin-bottom: 12px;
      outline: none;
      transition: border 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
    }

    input:focus,
    textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 1px rgba(31, 111, 235, 0.1);
      background: #ffffff;
    }

    textarea {
      min-height: 140px;
      resize: vertical;
    }

    .hint {
      font-size: 0.8rem;
      color: var(--muted);
      margin-bottom: 10px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 18px;
      border-radius: 999px;
      border: none;
      cursor: pointer;
      font-size: 0.95rem;
      font-weight: 500;
      text-decoration: none;
      background: var(--primary);
      color: #fff;
      box-shadow: 0 10px 25px rgba(31, 111, 235, 0.28);
      transition: transform 0.1s ease, box-shadow 0.1s ease;
    }

    .btn:hover {
      transform: translateY(-1px);
      box-shadow: 0 14px 30px rgba(31, 111, 235, 0.35);
    }

    .contact-info p {
      font-size: 0.93rem;
      margin: 0 0 6px;
    }

    .contact-info a {
      color: var(--primary);
      text-decoration: none;
    }

    .contact-info a:hover {
      text-decoration: underline;
    }

    .disclaimer {
      font-size: 0.82rem;
      color: var(--muted);
      margin-top: 14px;
    }

    footer {
      border-top: 1px solid var(--border);
      padding: 16px;
      font-size: 0.8rem;
      color: var(--muted);
      text-align: center;
      background: #ffffff;
    }

    @media (max-width: 768px) {
      nav {
        display: none;
      }
    }