* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    }

    body {
      min-height: 100vh;
      background: linear-gradient(145deg, #0b1f2e 0%, #0d3b4a 100%);
      background-attachment: fixed;
      display: flex;
      flex-direction: column;
      position: relative;
      color: #f0f9ff;
    }
    body::before {
        content: "";
        position: fixed;
        top: 0;      /* ADD THIS */
        left: 0;     /* ADD THIS */
        width: 100%;
        height: 100%;
    
        background-image: url("../img/flags.png");
        background-repeat: repeat;
        background-size: 500px;
    
        opacity: 0.1;
        z-index: -1;
    }

    /* ---------- MAIN CONTENT (above flags) ---------- */
    .page-wrapper {
      position: relative;
      z-index: 10;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
      backdrop-filter: blur(1px);
    }

    /* ---------- GLASS COMPONENTS (navy->teal gradient + glassmorphism) ---------- */
    .glass-header, .glass-section, .glass-footer {
      background: rgba(8, 38, 54, 0.4); /* deep navy base */
      backdrop-filter: blur(12px) saturate(180%);
      -webkit-backdrop-filter: blur(12px) saturate(180%);
      border: 1px solid rgba(64, 224, 208, 0.2); /* teal accent */
      box-shadow: 0 12px 35px -8px rgba(0,0,0,0.5), 0 0 0 1px rgba(0, 180, 180, 0.1) inset;
    }

    /* gradient header specific (navy to teal) */
    .gradient-bar {
      background: linear-gradient(120deg, #0a2e3f, #16697a);
      background-blend-mode: overlay;
    }

    /* ---------- HEADER ---------- */
    header {
      width: 100%;
      padding: 1rem 2rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      border-bottom: 2px solid rgba(0, 230, 200, 0.3);
      position: sticky;
      top: 0;
      z-index: 30;
    }

    .logo {
      font-size: 1.9rem;
      font-weight: 700;
      letter-spacing: 1px;
      background: linear-gradient(135deg, #e0f2fe, #a5f0e7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-shadow: 0 2px 5px rgba(0,255,200,0.3);
    }
    .logo i {
      color: #5ee0d0;
      -webkit-text-fill-color: initial;
      background: none;
      margin-right: 8px;
    }

    /* desktop navigation */
    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
    }
    .nav-links a {
      text-decoration: none;
      color: #e6f7f5;
      font-weight: 500;
      padding: 0.5rem 0.2rem;
      border-bottom: 2px solid transparent;
      transition: 0.25s;
      font-size: 1.1rem;
    }
    .nav-links a:hover {
      border-bottom-color: #2dd4bf;
      color: white;
      text-shadow: 0 0 8px #2dd4bf;
    }

    /* mobile menu toggle (hidden on desktop) */
    .menu-toggle {
      display: none;
      font-size: 2rem;
      color: #b0f0ed;
      cursor: pointer;
      background: rgba(0,0,0,0.2);
      width: 50px;
      height: 50px;
      border-radius: 30px;
      justify-content: center;
      align-items: center;
      transition: 0.2s;
    }
    .menu-toggle:hover {
      background: rgba(45, 212, 191, 0.3);
    }
    #nav-checkbox {
      display: none;
    }

    /* ---------- HERO / ACCOUNT FORM SECTION ---------- */
    .hero-section {
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 3rem 1.5rem;
    }

    .glass-card {
      background: rgba(10, 45, 60, 0.8);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-radius: 48px;
      padding: 2.5rem 2.2rem;
      width: 100%;
      max-width: 550px;
      border: 1px solid rgba(0, 210, 200, 0.35);
      box-shadow: 0 30px 50px -20px rgba(0,20,20,0.8), 0 0 0 1px rgba(64, 224, 208, 0.2) inset;
      transition: 0.3s;
    }

    .glass-card h2 {
      font-size: 2.2rem;
      margin-bottom: 0.3rem;
      background: linear-gradient(120deg, #ffffff, #a0f0ea);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .glass-card h2 i {
      color: #1ab2a0;
      margin-right: 10px;
    }

    .form-row {
      margin-bottom: 1.6rem;
    }

    label {
      display: block;
      font-weight: 500;
      margin-bottom: 0.5rem;
      color: #005c40;
      letter-spacing: 0.3px;
      font-size: 1.3rem;
    }

    .input-wrapper {
      display: flex;
      align-items: center;
      background: rgba(255, 255, 255, 0.06);
      border-radius: 44px;
      padding: 0.2rem 1.2rem;
      border: 1px solid rgba(0, 220, 200, 0.3);
      transition: all 0.2s;
    }
    .input-wrapper:focus-within {
      border-color: #4fd1c5;
      box-shadow: 0 0 0 3px rgba(79, 209, 197, 0.3);
      background: rgba(0, 50, 55, 0.5);
    }
    .input-wrapper i {
      color: #2dd4bf;
      font-size: 1.2rem;
      width: 30px;
    }
    .input-wrapper input {
      width: 100%;
      background: transparent;
      border: none;
      padding: 1rem 0.5rem 1rem 0;
      font-size: 1rem;
      color: white;
      outline: none;
    }
    .input-wrapper input::placeholder {
      color: rgba(210, 245, 240, 0.55);
      font-weight: 300;
    }

    /* validation live style */
    .input-wrapper.error {
      border-color: #ff9472;
      background: rgba(180, 70, 50, 0.15);
    }

    .validation-hint {
      font-size: 0.8rem;
      margin-top: 0.3rem;
      margin-left: 1.2rem;
      color: #a7e0da;
      min-height: 1.4rem;
    }
    .validation-hint i {
      margin-right: 4px;
    }
    .valid-msg { color: #7ae9d6; }
    .invalid-msg { color: #ffb09c; }

    .btn-primary {
      background: linear-gradient(145deg, #11698c, #0e8d7a);
      border: none;
      color: white;
      font-size: 1.4rem;
      font-weight: 600;
      padding: 1rem 2rem;
      width: 100%;
      border-radius: 60px;
      cursor: pointer;
      margin-top: 1.5rem;
      transition: all 0.25s;
      box-shadow: 0 10px 20px -8px #0a3f44;
      border: 1px solid rgba(255,255,255,0.2);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
    }
    .btn-primary:hover {
      background: linear-gradient(145deg, #1483aa, #0fa68f);
      transform: scale(1.02);
      box-shadow: 0 15px 25px -8px #07323b;
      border-color: #9bfff0;
    }
    .btn-info {
      background: linear-gradient(145deg, #1800a3, #12a8ff);
      border: none;
      color: white;
      font-size: 1.4rem;
      font-weight: 600;
      padding: 1rem 2rem;
      width: 100%;
      border-radius: 60px;
      cursor: pointer;
      margin-top: 1.5rem;
      transition: all 0.25s;
      box-shadow: 0 10px 20px -8px #0a3f44;
      border: 1px solid rgba(255,255,255,0.2);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
    }
    .btn-info:hover {
      background: linear-gradient(145deg, #2048fa, #0fa68f);
      transform: scale(1.02);
      box-shadow: 0 15px 25px -8px #07323b;
      border-color: #9bfff0;
    }

    /* ---------- FEATURES SECTION (glass) ---------- */
    .features-section {
      padding: 4rem 2rem 5rem 2rem;
      display: flex;
      flex-wrap: wrap;
      gap: 2rem;
      justify-content: center;
      background: transparent;
    }

    .feature-item {
      background: rgba(7, 40, 50, 0.45);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border-radius: 40px;
      padding: 2rem 1.8rem;
      width: 260px;
      text-align: center;
      border: 1px solid rgba(0, 190, 180, 0.3);
      box-shadow: 0 20px 25px -10px black;
      transition: 0.2s;
    }
    .feature-item:hover {
      border-color: #42e0d0;
      transform: translateY(-8px);
    }
    .feature-item i {
      font-size: 3.2rem;
      background: linear-gradient(45deg, #8ff0e5, #52c0b5);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 1.2rem;
    }
    .feature-item h3 {
      font-size: 1.8rem;
      font-weight: 600;
      color: #dafaf5;
    }
    .feature-item p {
      color: #bfe9e5;
    }

    /* ---------- FOOTER (glass + gradient touch) ---------- */
    footer {
      margin-top: auto;
      padding: 2rem 2rem 1.8rem 2rem;
      text-align: center;
      border-top: 2px solid rgba(0, 200, 200, 0.25);
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 1.5rem;
    }
    .footer-copy {
      color: #b0ddd8;
      font-size: 1rem;
    }
    .footer-links a {
      color: #b4f0ea;
      margin: 0 1.2rem;
      text-decoration: none;
      font-weight: 400;
      border-bottom: 1px dotted transparent;
    }
    .footer-links a:hover {
      border-bottom-color: #4fd1c5;
    }
    .footer-social i {
      font-size: 1.7rem;
      margin: 0 0.5rem;
      color: #6fd1c5;
      transition: 0.2s;
    }
    .footer-social i:hover {
      color: white;
      text-shadow: 0 0 15px teal;
    }

    /* ---------- RESPONSIVE DESIGN (mobile nav toggle, stack) ---------- */
    @media screen and (max-width: 850px) {
      .menu-toggle {
        display: flex; /* visible on tablet/mobile */
      }

      .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: center;
        gap: 1rem;
        padding: 1.8rem 0 1.2rem 0;
        background: rgba(8, 40, 48, 0.8);
        backdrop-filter: blur(16px);
        border-radius: 50px;
        margin-top: 1rem;
        border: 1px solid #309088;
      }

      /* mobile checked state */
      #nav-checkbox:checked ~ .nav-links {
        display: flex;
      }

      header {
        padding: 1rem 1.5rem;
      }

      .glass-card {
        padding: 2rem 1.5rem;
      }
    }

    @media screen and (max-width: 550px) {
      .logo {
        font-size: 1.5rem;
      }
      .glass-card h2 {
        font-size: 1.8rem;
      }
      .feature-item {
        width: 100%;
        max-width: 320px;
      }
      footer {
        flex-direction: column;
        text-align: center;
      }
    }

    /* small validation demo */
    .form-message {
      text-align: center;
      margin-top: 1rem;
      color: #a3f5e6;
      font-weight: 300;
    }