:root {
    --bg-color: #0d0d12;
    --card-bg: #1a1a24;
    --primary: #00f2ff; /* Cyan Neon */
    --secondary: #bd00ff; /* Purple Neon */
    --success: #00ff9d;
    --error: #ff0055;
    --text-main: #ffffff;
    --text-muted: #a0a0b0;
    --font-family: 'Inter', sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-family);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 480px;
    margin: 0 auto;
}

h1, h2, h3 {
    margin-bottom: 1rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    border: 1px solid rgba(255,255,255,0.05);
    margin-bottom: 20px;
}

.btn {
    display: block;
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    text-align: center;
    text-decoration: none;
}

.btn:active {
    transform: scale(0.98);
}

.btn:hover {
    box-shadow: 0 0 15px rgba(0, 242, 255, 0.4);
}

.input-group {
    margin-bottom: 15px;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

input {
    width: 100%;
    padding: 12px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 8px;
    color: #fff;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

input:focus {
    border-color: var(--primary);
}

.qr-container {
    background: #fff;
    padding: 20px;
    border-radius: 12px;
    display: inline-block;
    margin: 20px 0;
}

.status-success {
    color: var(--success);
}
.status-error {
    color: var(--error);
}

.hidden {
    display: none;
}

.balance-display {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}