* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background:
    radial-gradient(circle at top, #003b4a, transparent 35%),
    linear-gradient(180deg, #0b0b0d, #050505);
  color: white;
}

.app {
  max-width: 460px;
  margin: auto;
  min-height: 100vh;
  padding: 22px;
}

.hero {
  text-align: center;
  padding: 30px 0 20px;
  
}

.logo {
  width: 300px;
  max-width: 95%;
  margin-bottom: 20px;
  filter: drop-shadow(0 0 20px rgba(0, 212, 255, 0.4));
}

.hero h1 {
  margin: 0;
  font-size: 38px;
  color: #00d4ff;
  letter-spacing: 1px;
}

.hero p {
  margin-top: 8px;
  color: #d7f7ff;
  font-size: 16px;
}

.card,
.install-box,
.footer {
  background: rgba(20, 20, 24, 0.92);
  border: 1px solid rgba(0, 212, 255, 0.35);
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 0 35px rgba(0, 212, 255, 0.18);
}

.card,
.install-box {
  margin-bottom: 28px;
}

h2 {
  margin-top: 0;
  font-size: 28px;
}

.intro,
.install-box p,
.footer p {
  color: #ccc;
  line-height: 1.5;
}

label {
  display: block;
  margin-top: 18px;
  margin-bottom: 7px;
  color: #d7f7ff;
  font-size: 14px;
}

input,
select,
textarea {
  width: 100%;
  padding: 14px;
  border-radius: 12px;
  border: 1px solid #333;
  background: #111;
  color: white;
  font-size: 16px;
  outline: none;
}

input:focus,
select:focus,
textarea:focus {
  border-color: #00d4ff;
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.35);
}

textarea {
  min-height: 130px;
  resize: vertical;
}

input[type="file"] {
  background: #181818;
  border: 1px dashed #00d4ff;
}

button,
.install-button {
  width: 100%;
  padding: 17px;
  margin-top: 25px;
  border: none;
  border-radius: 15px;
  background: linear-gradient(90deg, #00d4ff, #00ffbf);
  color: #000;
  font-size: 17px;
  font-weight: bold;
  cursor: pointer;
}

button:hover,
.install-button:hover {
  opacity: 0.9;
}

.install-box {
  text-align: center;
}

.install-box h2,
.footer h3 {
  margin-top: 0;
  color: #00d4ff;
}

.install-note {
  font-size: 13px;
  margin-top: 14px;
}

.footer {
  text-align: center;
  color: #ccc;
}

.qr-code {
  width: 200px;
  max-width: 200px;
  height: auto;
  margin: 15px auto;
  display: block;
  border-radius: 12px;
  background: white;
  padding: 8px;
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.25);
}

.footer-copy {
  margin-top: 18px;
  color: #777;
  font-size: 12px;
}