body {
    background: #0a0a0f;
    color: white;
    font-family: 'Segoe UI', sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

/* Layout */
.hero {
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    background: linear-gradient(45deg, cyan, magenta);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    color: #aaa;
}

.code-drop-zone:hover {
    background: rgba(0, 255, 255, 0.05);
    transform: scale(1.02);
}

/* Input */
.code-input {
    width: 280px;
    padding: 18px 20px;
    border-radius: 40px;
    background: rgba(0, 0, 0, 0.45);
    border: 2px dashed rgba(0, 255, 255, 0.6);
    color: #00f6ff;
    font-size: 24px;
    letter-spacing: 12px;
    font-family: monospace;
    text-align: center;
    outline: none;
    transition: all 0.3s ease;
    box-shadow: 0 0 25px rgba(0, 255, 255, 0.25);
}

.code-input::placeholder {
    color: rgba(0, 255, 255, 0.4);
}

.code-input:focus {
    border-color: magenta;
    box-shadow: 0 0 35px rgba(255, 0, 255, 0.6);
}

/* Button */
.btn-primary {
    margin-top: 20px;
    padding: 12px 30px;
    border-radius: 40px;
    border: none;
    cursor: pointer;
    font-weight: bold;
    background: linear-gradient(45deg, cyan, magenta);
    color: black;
}

/* Error */
.error-text {
    color: red;
    margin-bottom: 10px;
}