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

body {
    background: #f5f7fb;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    max-width: 500px;
    width: 100%;
    margin: auto;
    background: white;
    border-radius: 32px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.05);
    overflow: hidden;
    padding: 24px;
}

h2 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 24px;
    color: #1e293b;
    text-align: center;
}

input {
    width: 100%;
    padding: 14px 16px;
    margin: 10px 0;
    border: 1px solid #e2e8f0;
    border-radius: 24px;
    font-size: 16px;
    background: #ffffff;
    transition: 0.2s;
}

input:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59,130,246,0.2);
}

button, .btn {
    background: #3b82f6;
    color: white;
    border: none;
    padding: 14px 20px;
    border-radius: 40px;
    font-size: 16px;
    font-weight: 500;
    width: 100%;
    cursor: pointer;
    transition: 0.2s;
    text-align: center;
    display: inline-block;
    margin: 10px 0;
}

button:hover, .btn:hover {
    background: #2563eb;
}

.number-card {
    background: #f8fafc;
    border-radius: 24px;
    padding: 20px;
    margin: 20px 0;
    border: 1px solid #e2e8f0;
}

.phone-number {
    font-size: 22px;
    font-weight: 600;
    font-family: monospace;
    background: #eef2ff;
    padding: 12px;
    border-radius: 20px;
    text-align: center;
    letter-spacing: 1px;
}

.otp-result {
    background: #f1f5f9;
    padding: 12px;
    border-radius: 20px;
    font-family: monospace;
    font-size: 18px;
    text-align: center;
    margin-top: 12px;
}

.flex-buttons {
    display: flex;
    gap: 12px;
    margin-top: 10px;
}

.flex-buttons button {
    flex: 1;
    margin: 0;
}

small a {
    color: #3b82f6;
    text-decoration: none;
}

.alert {
    background: #fee2e2;
    color: #b91c1c;
    padding: 12px;
    border-radius: 20px;
    margin: 10px 0;
    text-align: center;
}